Communication apparatus and communication method
Abstract
[Task] Even when the coding method is switched during communication with the communication partner, the generation of abnormal noise, the disturbance of the image, and the interruption of the audio and / or the image are prevented.
Solution.When switching the coding method from the first coding method to the second coding method during communication with the communication partner (S302), the packet communication device 100 (sender) waits until the communication partner is ready. The audio and / or video signal encoded by the first coding method and the audio and / or video signal encoded by the second coding method are transmitted (S304). In the packet communication device 200 (reception side), after the decoding process of the second decoding method corresponding to the second coding method becomes stable (S305), the voice decoded by the second decoding method and the voice / Or output a video signal.
Term
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Projected expiry passed 28 March 2021, 5.5 years ago.
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24 claims: 8 independent, 16 dependent
- 1【特許請求の範囲】 【請求項1】 第1の符号化方式で符号化された音声信号を含む第1の符号化データを生成する第1の符号化手段と、 前記第1の符号化方式とは異なる第2の符号化方式で符号化された音声信号を含む第2の符号化データを生成する第2の符号化手段と、 前記第1の符号化データ及び前記第2の符号化データの少なくとも一方を送信する送信手段とを有し、 通信相手との通信中に符号化方式を前記第1の符号化方式から前記第2の符号化方式に切り替える場合、前記送信手段は、前記第1の符号化データ及び前記第2の符号化データを送信することを特徴とする通信装置。
- 2【請求項2】 前記第1の符号化データ及び前記第2の符号化データを送信する場合、前記送信手段は、別々のパケットでパケット化された前記第1の符号化データ及び前記第2の符号化データを送信することを特徴とする請求項1に記載の通信装置。
- 3【請求項3】 前記第1の符号化データ及び前記第2の符号化データを送信する場合、前記送信手段は、同じパケットでパケット化された前記第1の符号化データ及び前記第2の符号化データを送信することを特徴とする請求項1に記載の通信装置。
- 4【請求項4】 前記送信手段は、新たな呼を接続することなく、前記第1の符号化データ及び前記第2の符号化データを送信することを特徴とする請求項1~3の何れか記載の通信装置。
- 5【請求項5】 前記送信手段は、前記第2の符号化手段が前記第2の符号化データの生成を開始してから所定時間が経過するまで、前記第2の符号化データを送信しないことを特徴とする請求項1~4の何れかに記載の通信装置。
- 6【請求項6】 前記第1の符号化データは、前記第1の符号化方式で符号化された映像信号を含み、前記第2の符号化データは、前記第2の符号化方式で符号化された映像信号を含むことを特徴とする請求項1~5の何れかに記載の通信装置。
- 7【請求項7】 第1の符号化方式で符号化された音声信号を含む第1の符号化データを生成する第1の符号化ステップと、 前記第1の符号化方式とは異なる第2の符号化方式で符号化された音声信号を含む第2の符号化データを生成する第2の符号化ステップと、 前記第1の符号化データ及び前記第2の符号化データの少なくとも一方を送信する送信ステップとを有し、 通信相手との通信中に符号化方式を前記第1の符号化方式から前記第2の符号化方式に切り替える場合、前記送信ステップは、前記第1の符号化データ及び前記第2の符号化データを送信することを特徴とする通信方法。
- 8【請求項8】 前記第1の符号化データ及び前記第2の符号化データを送信する場合、前記送信ステップは、別々のパケットにパケット化された前記第1の符号化データ及び前記第2の符号化データを送信することを特徴とする請求項7に記載の通信方法。
- 9【請求項9】 前記第1の符号化データ及び前記第2の符号化データを送信する場合、前記送信ステップは、同じパケットにパケット化された前記第1の符号化データ及び前記第2の符号化データを送信することを特徴とする請求項7に記載の通信方法。
- 10【請求項10】 前記送信ステップは、新たな呼を接続することなく、前記第1の符号化データ及び前記第2の符号化データを送信することを特徴とする請求項7~9の何れかに記載の通信方法。
- 11【請求項11】 前記送信ステップは、前記第2の符号化ステップが前記第2の符号化データの生成を開始してから所定時間が経過するまで、前記第1の符号化データを送信しないことを特徴とする請求項7~10の何れかに記載の通信方法。
- 12【請求項12】 前記第1の符号化データは、前記第1の符号化方式で符号化された映像信号を含み、前記第2の符号化データは、前記第2の符号化方式で符号化された映像信号を含むことを特徴とする請求項7~11の何れかに記載の通信方法。
- 13【請求項13】 第1の符号化方式で符号化された音声信号を含む第1の符号化データ及び前記第1の符号化方式とは異なる第2の符号化方式で符号化された音声信号を含む第2の符号化データの少なくとも一方を受信する受信手段と、 前記第1の符号化データを復号化する第1の復号化手段と、 前記第2の符号化データを復号化する第2の復号化手段と、 前記第1の復号化ステップから出力された音声信号又は前記第2の復号化手段から出力された音声信号の何れか一方を出力する出力手段とを有し、 通信相手との通信中に符号化方式を前記第1の符号化方式から前記第2の符号化方式に切り替える場合、前記受信手段は、前記第1の符号化データ及び前記第2の符号化データを受信することを特徴とする通信装置。
- 14【請求項14】 前記第1の符号化データ及び前記第2の符号化データを受信する場合、前記受信手段は、別々のパケットにパケット化された前記第1の符号化データ及び前記第2の符号化データを受信することを特徴とする請求項13に記載の通信装置。
- 15【請求項15】 前記第1の符号化データ及び前記第2の符号化データを受信する場合、前記受信手段は、同じパケットにパケット化された前記第1の符号化データ及び前記第2の符号化データを受信することを特徴とする請求項13に記載の通信装置。
- 16【請求項16】 前記受信手段は、新たな呼を接続することなく、前記第1の符号化データ及び前記第2の符号化データを受信することを特徴とする請求項13~15の何れかに記載の通信装置。
- 17【請求項17】 前記出力手段は、前記第2の復号化手段が前記第2の符号化データの復号化を開始してから所定時間が経過するまで、前記第2の復号化手段から出力された音声信号を出力しないことを特徴とする請求項13~16の何れかに記載の通信装置。
- 18【請求項18】 前記第1の符号化データは、前記第1の符号化方式で符号化された映像信号を含み、前記第2の符号化データは、前記第2の符号化方式で符号化された映像信号を含むことを特徴とする請求項13~17の何れかに記載の通信装置。
- 19【請求項19】 第1の符号化方式で符号化された音声信号を含む第1の符号化データ及び前記第1の符号化方式とは異なる第2の符号化方式で符号化された音声信号を含む第2の符号化データの少なくとも一方を受信する受信ステップと、 前記第1の符号化データを復号化する第1の復号化ステップと、 前記第2の符号化データを復号化する第2の復号化ステップと、 前記第1の復号化ステップから出力された音声信号又は前記第2の復号化手段から出力された音声信号の何れか一方を出力する出力ステップとを有し、 通信相手との通信中に符号化方式を前記第1の符号化方式から前記第2の符号化方式に切り替える場合、前記受信ステップは、前記第1の符号化データ及び前記第2の符号化データを受信することを特徴とする通信方法。
- 20【請求項20】 前記第1の符号化データ及び前記第2の符号化データを受信する場合、前記受信ステップは、別々のパケットにパケット化された前記第1の符号化データ及び前記第2の符号化データを受信することを特徴とする請求項19に記載の通信方法。
- 21【請求項21】 前記第1の符号化データ及び前記第2の符号化データを受信する場合、前記受信ステップは、同じパケットにパケット化された前記第1の符号化データ及び前記第2の符号化データを受信することを特徴とする請求項19に記載の通信方法。
- 22【請求項22】 前記受信ステップは、新たな呼を接続することなく、前記第1の符号化データ及び前記第2の符号化データを受信することを特徴とする請求項19~21の何れかに記載の通信方法。
- 23【請求項23】 前記出力ステップは、前記第2の復号化ステップが前記第2の符号化データの復号化を開始してから所定時間が経過するまで、前記第2の復号化ステップから出力された音声信号を出力しないことを特徴とする請求項19~22の何れかに記載の通信方法。
- 24【請求項24】 前記第1の符号化データは、前記第1の符号化方式で符号化された映像信号を含み、前記第2の符号化データは、前記第2の符号化方式で符号化された映像信号を含むことを特徴とする請求項19~23の何れかに記載の通信方法。
Independent claims24
213 paragraphs in 1 section, as filed
Description: TECHNICAL FIELD [Detailed description of the invention]
【0001】
[Technical field to which the invention belongs]
The present invention relates to a communication device provided with a plurality of types of coding methods or decoding methods and a control method thereof.
【0002】
[Conventional technology]
For example, the following method is known as a method of switching the coding method during communication with a communication partner. The first method is a method of switching after transmitting a switching request. The second method is a method of switching the coding method after receiving a response to the switching request.
【0003】
[Problems to be Solved by the Invention]
However, in the first method, from the time when the transmitting side communication device switches the coding method to the time when the receiving side communication device switches the decoding method, the receiving side communication device uses the switching coding method. Since the encoded audio and / or video data is decoded by a decoding method corresponding to the coding method before switching, there is a problem that abnormal noise is generated and the image is disturbed.
【0004】
On the other hand, in the second method, from the time when the receiving side communication device switches the decoding method to the time when the transmitting side communication device switches the coding method, the receiving side communication device uses the coding method before the switching. Since the encoded audio and / or video data is decoded by a decoding method corresponding to the coding method after switching, there is a problem that abnormal noise is generated and the image is disturbed.
【0005】
Therefore, recently, for example, a method has been proposed in which the output of audio is muted for a certain period of time when the coding method is switched, and then the output is gradually output to suppress the generation of abnormal noise. However, with such a method, although the generation of abnormal noise can be suppressed, there is a problem that audio and video are interrupted.
【0006】
Further, among the coding method or the decoding method, there is a method of feeding back past information to encode or decode. In such a method, if the coding method or the decoding method is switched before the coding process or the decoding process becomes stable, there is a problem that abnormal noise is generated or the image is disturbed.
【0007】
The present invention has been made in view of the above-mentioned problems, and even when the coding method is switched during communication with a communication partner, abnormal noise is generated, video is disturbed, audio and / or video is displayed. The purpose is to prevent interruptions.
【0008】
[Means for solving problems]
In order to achieve the object of the present invention, the communication device according to the present invention includes a first coding means for generating a first coded data including an audio signal encoded by the first coding method, and a first coding means. A second coding means for generating a second coded data including an audio signal encoded by a second coding method different from the first coding method, the first coded data, and the first coded data. When a transmission means for transmitting at least one of the second coded data is provided and the coding method is switched from the first coding method to the second coding method during communication with a communication partner. The transmitting means is characterized by transmitting the first coded data and the second coded data.
【0009】
Further, the communication method according to the present invention includes a first coding step for generating a first coded data including an audio signal encoded by the first coding method, and the first coding method. Is a second coding step that produces a second coded data that includes an audio signal encoded by a different second coding method, and the first coded data and the second coded data. When the transmission step of transmitting at least one of the data is provided and the coding method is switched from the first coding method to the second coding method during communication with the communication partner, the transmission step is the first. The coded data of the above and the second coded data of the above are transmitted.
【0010】
Further, the communication device according to the present invention encodes the first coded data including the voice signal encoded by the first coding method and the second coding method different from the first coding method. A receiving means for receiving at least one of the second coded data including the encoded audio signal, a first decoding means for decoding the first coded data, and the second coded data. It has a second decoding means for decoding and an output means for outputting either an audio signal output from the first decoding step or an audio signal output from the second decoding means. Then, when the coding method is switched from the first coding method to the second coding method during communication with the communication partner, the receiving means receives the first coded data and the second code. It is characterized by receiving the converted data.
【0011】
Further, the communication method according to the present invention is coded by a first coded data including an audio signal encoded by the first coding method and a second coding method different from the first coding method. A receiving step for receiving at least one of the second coded data including the encoded audio signal, a first decoding step for decoding the first coded data, and the second coded data. It has a second decoding step for decoding and an output step for outputting either an audio signal output from the first decoding step or an audio signal output from the second decoding means. Then, when the coding method is switched from the first coding method to the second coding method during communication with the communication partner, the receiving step includes the first coded data and the second code. It is characterized by receiving the converted data.
【0012】
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments suitable for the present invention will be described with reference to the drawings.
【0013】
(First Embodiment) FIG. 1 is a block diagram showing a configuration example of a packet communication device (transmitting side) in the first embodiment.
【0014】
Reference numeral 100 is a packet communication device (transmitting side) according to the first embodiment. Reference numeral 101 denotes, for example, a voice processing device including a microphone or a voice reproduction device. The audio processing device 101 outputs an analog audio signal in a predetermined audio format. Reference numeral 112 denotes, for example, a packet network composed of a LAN (Local Area Network), a WAN (Wide Area Network), the Internet, a satellite communication line, a serial bus conforming to the IEEE1394-1995 standard, or a wireless LAN. Reference numeral 113 denotes an image processing device including a video camera or a video reproduction device. The image processing device 113 outputs an analog video signal in a predetermined video format. For example, the voice processing device 101 and / or the image processing device 113 may be in the packet communication device 100.
【0015】
The input unit 102 converts the analog audio signal output from the audio input device 101 into a digital audio signal, and the analog video signal output from the video input device 113 into a digital video signal. The selection unit 103 converts the audio and / or video signal output from the input unit 102 into at least one coding unit 104-i (i = 1 to N (N is an integer of 2 or more) according to the instruction from the control unit 109). ).
【0016】
Each coding unit 104-i (i = 1 to N) encodes in parallel by a coding method in which each of the audio and / or video signals having the same content is provided. The audio coding method provided by each coding unit 104-i (i = 1 to N) is, for example, MPEG (Moving Picture Experts Group) 1 audio method conforming to the ISO / IEC 13818-3 standard, ADPCM (Adaptive Differential PCM). Method, SB-ADPCM (Sub-band ADPCM) method, LD-CELP (Low-Delay Code Excited Liner Prediction) method, etc. The video coding method provided by each coding unit 104-i (i = 1 to N) is, for example, the MPEG1 method compliant with the ISO / IEC11172-2 standard, the MPEG2 method compliant with the ISO / IEC13818-2 standard, and the like. Is. The combination of the audio coding method and the video coding method included in each coding unit 104-i (i = 1 to N) is different for each coding unit 104-i (i = 1 to N).
【0017】
The selection unit 105 supplies the coded data output from at least one coding unit 104-i (i = 1 to N) to the communication unit 106 according to the instruction from the control unit 109.
【0018】
The communication unit 106 generates a data packet including the coded data output from the selection unit 105, and transmits the generated data packet to another packet communication device. Further, the communication unit 106 generates a control packet including control data (switching request, switching response, switching confirmation, etc., which will be described later) output from the control unit 109, and transmits the generated control packet to another packet communication device. .. Further, the communication unit 106 receives the control packet transmitted from another packet communication device, and supplies the control data (switching request, switching response, switching confirmation, etc., which will be described later) included in the received control packet to the control unit 109. To do. The communication unit 106 includes, for example, a LAN controller, a TCP / IP (Transmission Control Protocol / Internet Protocol) protocol stack, a serial bus controller, or a wireless LAN controller.
【0019】
The control unit 109 controls the operation of the packet communication device 100 (transmitting side) according to a processing procedure described later. The control unit 109 includes a microcomputer, a memory, and various control programs. The operation unit 114 displays the currently selected coding method, displays the selectable coding method, and inquires the user about the coding method after switching. The timekeeping unit 115 clocks a time sufficient for the coding process of the coding method after switching to be stable.
【0020】
FIG. 2 is a block diagram showing a configuration example of a packet communication device (reception side) according to the first embodiment.
【0021】
Reference numeral 200 denotes a packet communication device (reception side) according to the first embodiment. Reference numeral 201 denotes a voice processing device including a speaker or a voice recording device. Reference numeral 213 is an image processing device provided with a display device such as a CRT, a liquid crystal panel, or a plasma display panel, or a video recording device. The voice processing device 201 and / or the image processing device 213 may be located in the packet communication device 200.
【0022】
The communication unit 206 receives the data packet transmitted from another packet communication device, and supplies the coded data included in the received data packet to the selection unit 205. Further, the communication unit 206 receives the control packet transmitted from another packet communication device, and supplies the control data (switching request, switching response, switching confirmation, etc., which will be described later) included in the received control packet to the control unit 209. To do. Further, the communication unit 206 generates a control packet including control data (switching request, switching response, switching confirmation, etc., which will be described later) supplied from the control unit 209, and transmits the generated control packet to another packet communication device. .. The communication unit 206 includes, for example, a LAN controller, a TCP / IP (Transmission Control Protocol / Internet Protocol) protocol stack, a serial bus controller, or a wireless LAN controller.
【0023】
The selection unit 205 supplies the coded data output from the communication unit 206 to at least one decoding unit 204-i (i = 1 to N (N is an integer of 2 or more)) according to the instruction from the control unit 209. To do.
【0024】
Each decoding unit 204-i (i = 1 to N) decodes in parallel by a decoding method that includes encoded data generated from audio and / or video signals having the same contents. The voice decoding method provided by each decoding unit 204-i (i = 1 to N) corresponds to the voice coding method provided by each coding unit 104-i (i = 1 to N). Further, the video decoding method provided by each decoding unit 204-i (i = 1 to N) corresponds to the video coding method provided by each coding unit 104-i (i = 1 to N). The combination of the audio decoding method and the video decoding method included in each decoding unit 204-i (i = 1 to N) is different for each decoding unit 204-i (i = 1 to N).
【0025】
The selection unit 203 supplies the audio and / or video signals output from at least one decoding unit 204-i (i = 1 to N) to the output 202 according to the instruction from the control unit 209.
【0026】
The output unit 202 converts the digital audio signal output from the selection unit 203 into an analog audio signal, and supplies the converted analog audio signal to the audio processing device 201. Further, the output unit 202 converts the digital video signal output from the selection unit 203 into an analog video signal, and supplies the converted analog video signal to the video processing device 213.
【0027】
The control unit 209 controls the operation of the packet communication device 200 (reception side) according to a processing procedure described later. The control unit 209 includes a microcomputer, a memory, and various control programs. The operation unit 214 displays the currently selected coding method, displays the selectable coding method, and inquires the user about the coding method after switching. The timekeeping unit 215 clocks a time sufficient for the coding process of the decoding method after switching to stabilize.
【0028】
Next, the configuration of the data packet in the first embodiment will be described with reference to FIG.
【0029】
As shown in FIG. 8, the data packet 800 in the first embodiment is composed of a header 801, a coding method information 802, a coded data 803, and a footer 804. The header 801 includes information for specifying a communication destination and the like. The coding method information 802 includes information indicating the coding method of the coded data 803 and the corresponding decoding method. The coded data 803 includes an audio and / or video signal encoded by the coding method before switching (for example, the first coding method included in the first coding unit 104-1). The footer 804 includes information and the like for detecting or correcting an error occurring in a data packet.
【0030】
Further, as shown in FIG. 8, the data packet 810 according to the first embodiment is composed of a header 811, a coding method information 812, a coded data 813, and a footer 814. The header 811 includes information for specifying the communication destination and the like. The coding method information 812 includes information indicating the coding method of the coded data 813 and the corresponding decoding method. The coded data 813 includes an audio and / or video signal encoded by a coded method after switching (for example, a second coding method provided in the second coding unit 104-2). The footer 814 includes information and the like for detecting or correcting an error occurring in a data packet.
【0031】
Next, an example of the main processing procedures of the packet communication devices 100 and 200 according to the first embodiment will be described with reference to FIG. FIG. 3 describes a processing procedure when the packet communication device 100 (sender side) requests switching of the coding method during communication with the packet communication device 200 (reception side). Further, in FIG. 3, the coding method before switching is, for example, the first coding method provided in the first coding unit 104-1, and the coding method after switching is, for example, the second coding unit 104-2. A case of using the second coding method provided in the above will be described.
【0032】
First, the processing procedure of step S301 will be described. The input unit 102 converts the analog audio signal output from the audio input device 101 into a digital audio signal, and the analog video signal output from the video input device 113 into a digital video signal. The selection unit 103 supplies the audio and / or video signal output from the input unit 102 to the first coding unit 104-1. The first coding unit 104-1 encodes the audio and / or video signal supplied from the selection unit 103 by the first coding method, and sequentially generates the coded data 803. The selection unit 105 supplies the coded data 803 output from the first coding unit 104-1 to the communication unit 106. The communication unit 106 sequentially generates data packets 800 including the coded data 803, and sequentially transmits these to the packet communication device 200.
【0033】
The communication unit 206 sequentially receives the data packets 800 transmitted from the packet communication device 100, supplies the coded data 803 to the selection unit 205, and supplies the coding method information 802 to the control unit 209. The control unit 209 discriminates between the coding method of the coded data 803 and the corresponding decoding method based on the coding method information 802. The selection unit 205 sequentially supplies the coded data 803 to the first decoding unit 204-1. The first decoding unit 204-1 decodes the coded data 803 by the first decoding method corresponding to the first coding method, and generates an audio and / or video signal. The selection unit 203 supplies the audio and / or video signal output from the first decoding unit 204-1 to the output unit 202. The output unit 202 converts the digital audio signal from the selection unit 203 into an analog audio signal, the digital video signal from the selection unit 203 into an analog video signal, and then transmits the analog audio signal to the audio output device 201. It is supplied to the video output device 201.
【0034】
Next, the processing procedure of step S302 will be described. The control unit 109 determines whether or not it is necessary to switch the coding method from the first coding method to the second coding method. For example, when the control unit 109 detects fluctuations in the traffic of the packet network 112 and automatically determines that the coding method needs to be changed from the first coding method to the second coding method, control is performed. Part 109 switches the coding method from the first coding method to the second coding method. Further, for example, when the user operates the operation unit 114 to instruct to change the coding method from the first coding method to the second coding method, the control unit 109 changes the coding method to the first. Switch from the coding method of to the second coding method. When switching the coding method from the first coding method to the second coding method, the control unit 109 uses the coding method before switching and the coding method after switching for audio and / or video signals having the same contents. Start preparing for coding. The timing unit 115 starts measuring the predetermined time T1 (a time sufficient for the operation of the second coding unit 104-2 to stabilize) according to the instruction from the control unit 109. The selection unit 103 supplies audio and / or video signals having the same contents to the first coding unit 104-1 and the second coding unit 104-2 according to the instruction from the control unit 109. The selection unit 105 supplies the coded data 803 output from the first coding unit 104-1 to the communication unit 106 according to the instruction from the control unit 109, but outputs the coded data 803 from the second coding unit 104-2. The encoded data 813 is not supplied to the communication unit 106. The selection unit 105 has a code output from the second coding unit 104-2 until a predetermined time T1 (a time sufficient for the operation of the second coding unit 104-2 to stabilize) elapses. Do not supply the converted data 813 to the communication unit 106.
【0035】
Next, the processing procedure of step S303 will be described. After the predetermined time T1 has elapsed (that is, after the coding process of the second coding unit 104-2 is stable), the control unit 109 requests control data for requesting switching of the coding method (hereinafter, switching). Request) is supplied to the communication unit 106. The communication unit 106 generates a control packet including a switching request and transmits the control packet to the packet communication device 200.
【0036】
The communication unit 206 receives the control packet (including the switching request) transmitted from the packet communication device 100. After receiving the switching request, the control unit 209 starts preparations for switching the coding method from the first coding method to the second coding method. Further, the time measuring unit 215 starts measuring the predetermined time T2 (a time sufficient for the operation of the second decoding unit 204-2 to stabilize) according to the instruction from the control unit 209.
【0037】
Next, the processing procedure of step S304 will be described. The selection unit 105 communicates the coded data 803 output from the first coding unit 104-1 and the coded data 813 output from the second coding unit 104-2 according to the instruction from the control unit 109. Supply to unit 106. The communication unit 106 sequentially generates a data packet 800 including the coded data 803 and a data packet 810 including the coded data 813, and sequentially transmits them to the packet communication device 200. The communication unit 106 starts transmitting the data packet 800 and the data packet 810 without connecting a new call to the packet communication device 200.
【0038】
The communication unit 206 sequentially receives the data packet 800 and the data packet 810 transmitted from the packet communication device 100, sets the coded data 803 and the coded data 813 in the selection unit 205, and controls the coding method information 802 and 813. Supply to 209. The control unit 209 discriminates between the coding method of the coded data 803 and the corresponding decoding method by the coding method information 802, and the coding method of the coded data 813 and the corresponding decoding by the coding method information 812. Determine the conversion method.
【0039】
The selection unit 205 supplies the coded data 803 to the first decoding unit 204-1 and the coded data 813 to the second decoding unit 204-2 according to the instruction from the control unit 209. The selection unit 203 supplies the audio and / or video signal output from the first decoding unit 204-1 to the output unit 202 according to the instruction from the control unit 209, but the second decoding unit 204-2 The audio and / or video signal output from is not supplied to the output unit 202. In addition, the selection unit 203 is the sound output from the second decoding unit 204-2 until a predetermined time T2 (a time sufficient for the operation of the second coding unit 104-2 to stabilize) elapses. And / or do not supply the video signal to the output unit 202.
【0040】
Next, the processing procedure of step S305 will be described. After the predetermined time T2 has elapsed (that is, after the decoding process of the second decoding unit 204-2 is stable), the selection unit 203 follows the instruction from the control unit 209 to perform the second decoding unit 204-. The audio and / or video signal output from 2 is supplied to the output unit 202, but the audio and / or video signal output from the first decoding unit 204-1 is not supplied to the output unit 202. The output unit 202 converts the digital audio signal from the selection unit 203 into an analog audio signal, the digital video signal from the selection unit 203 into an analog video signal, and then transmits the analog audio signal to the audio output device 201. It is supplied to the image device 213. Further, the control unit 109 supplies the control data corresponding to the switching request (hereinafter, switching response) to the communication unit 206. The communication unit 206 generates a control packet including a switching response and transmits the control packet to the packet communication device 100.
【0041】
The communication unit 106 receives a control packet (including a switching response) transmitted from the packet communication device 200. After receiving the switching response, the control unit 109 stops the process of encoding the audio and / or video signal by the first coding method.
【0042】
Next, the processing procedure of step S306 will be described. After receiving the switching response, the control unit 109 supplies the switching confirmation to the communication unit 106. The communication unit 206 generates a control packet including a switching confirmation and transmits the control packet to the packet communication device 200.
【0043】
Next, the processing procedure of step S307 will be described. The selection unit 103 supplies the audio and / or video signal output from the input unit 102 to the second coding unit 104-2 according to the instruction from the control unit 109, but the first coding unit 104-1 Do not supply to. Further, the selection unit 105 supplies the coded data 813 output from the second coding unit 104-2 to the communication unit 106 in accordance with the instruction from the control unit 109. The communication unit 106 sequentially generates a data packet 810 including the coded data 813, and sequentially transmits these to the packet communication device 200. Since the packet communication device 200 has already switched the coding method from the first coding method to the second coding method, the data packet 810 transmitted from the packet communication device 100 can be decoded without any trouble. , The generation of abnormal noise, the disturbance of the image, the interruption of the sound and / or the image can be prevented.
【0044】
Next, another example of the main processing procedure of the packet communication devices 100 and 200 according to the first embodiment will be described with reference to FIG. FIG. 4 describes a processing procedure when the packet communication device 200 (reception side) requests switching of the coding method during communication with the packet communication device 100 (sending side). Further, in FIG. 4, similarly to the description of FIG. 3, the coding method before switching is, for example, the first coding method provided in the first coding unit 104-1, and the coding method after switching is, for example, the first. A case where the second coding method provided in the coding unit 104-2 of 2 is used will be described.
【0045】
First, the processing procedure in step S401 will be described. Since the processing procedure in step S401 is the same as the processing procedure in step S301, the description thereof will be omitted.
【0046】
Next, the processing procedure of step S402 will be described. The control unit 209 determines whether or not it is necessary to switch the coding method from the first coding method to the second coding method. For example, when the control unit 209 detects fluctuations in the traffic of the packet network 112 and automatically determines that the coding method needs to be changed from the first coding method to the second coding method, control is performed. Part 209 switches the coding method from the first coding method to the second coding method. Further, for example, when the user operates the operation unit 214 to instruct to change the coding method from the first coding method to the second coding method, the control unit 209 changes the coding method to the first. Switch from the coding method of to the second coding method. When the coding method is switched from the first coding method to the second coding method, the control unit 109 sends control data (hereinafter, switching request) for requesting the switching of the coding method to the communication unit 206. Supply. The communication unit 206 generates a control packet including a switching request and transmits the control packet to the packet communication device 100.
【0047】
The communication unit 106 receives a control packet (including a switching request) transmitted from the packet communication device 200. After receiving the switching request, the control unit 109 starts preparations for encoding the audio and / or video signals having the same contents by the first and second coding methods. Further, the time measuring unit 115 starts measuring the predetermined time T1 (a time sufficient for the operation of the second decoding unit 104-2 to stabilize) according to the instruction from the control unit 109. The selection unit 103 supplies audio and / or video signals having the same contents to the first coding unit 104-1 and the second coding unit 104-2 according to the instruction from the control unit 109. The selection unit 105 supplies the coded data 803 output from the first coding unit 104-1 to the communication unit 106 according to the instruction from the control unit 109, but outputs the coded data 803 from the second coding unit 104-2. The encoded data 813 is not supplied to the communication unit 106. The selection unit 105 has a code output from the second coding unit 104-2 until a predetermined time T1 (a time sufficient for the operation of the second coding unit 104-2 to stabilize) elapses. Do not supply the converted data 813 to the communication unit 106.
【0048】
Next, the processing procedure of step S403 will be described. After the predetermined time T1 has elapsed (that is, after the coding process of the second coding unit 104-2 is stable), the control unit 109 supplies the switching response to the communication unit 106. The communication unit 106 generates a control packet including a switching response and transmits the control packet to the packet communication device 200.
【0049】
The communication unit 206 receives the control packet (including the switching response) transmitted from the packet communication device 100. After receiving the switching response, the control unit 209 starts preparations for switching the coding method from the first coding method to the second coding method. Further, the time measuring unit 215 starts measuring the predetermined time T2 (a time sufficient for the operation of the second decoding unit 204-2 to stabilize) according to the instruction from the control unit 209.
【0050】
Next, the processing procedure of step S404 will be described. The selection unit 105 communicates the coded data 803 output from the first coding unit 104-1 and the coded data 813 output from the second coding unit 104-2 according to the instruction from the control unit 109. Supply to unit 106. The communication unit 106 sequentially generates a data packet 800 including the coded data 803 and a data packet 810 including the coded data 813, and sequentially transmits them to the packet communication device 200. The communication unit 106 starts transmitting the data packet 800 and the data packet 810 without connecting a new call to the packet communication device 200.
【0051】
The communication unit 206 sequentially receives the data packet 800 and the data packet 810 transmitted from the packet communication device 100, sets the coded data 803 and the coded data 813 in the selection unit 205, and controls the coding method information 802 and 813. Supply to 209. The control unit 209 discriminates between the coding method of the coded data 803 and the corresponding decoding method by the coding method information 802, and the coding method of the coded data 813 and the corresponding decoding by the coding method information 812. Determine the conversion method. The selection unit 205 supplies the coded data 803 to the first decoding unit 204-1 and the coded data 813 to the second decoding unit 204-2 according to the instruction from the control unit 209. The selection unit 203 supplies the audio and / or video signal output from the first decoding unit 204-1 to the output unit 202 according to the instruction from the control unit 209, but the second decoding unit 204-2 The audio and / or video signal output from is not supplied to the output unit 202. In addition, the selection unit 203 is the sound output from the second decoding unit 204-2 until a predetermined time T2 (a time sufficient for the operation of the second coding unit 104-2 to stabilize) elapses. And / or do not supply the video signal to the output unit 202.
【0052】
Next, the processing procedure of step S405 will be described. After the predetermined time T2 has elapsed (that is, after the decoding process of the second decoding unit 204-2 is stable), the selection unit 203 follows the instruction from the control unit 209 to perform the second decoding unit 204-. The audio and / or video signal output from 2 is supplied to the output unit 202, but the audio and / or video signal output from the first decoding unit 204-1 is not supplied to the output unit 202. The output unit 202 converts the digital audio signal from the selection unit 203 into an analog audio signal, the digital video signal from the selection unit 203 into an analog video signal, and then transmits the analog audio signal to the audio output device 201. It is supplied to the video device 213. Further, the control unit 109 supplies the switching confirmation to the communication unit 206. The communication unit 206 generates a control packet including a switching confirmation and transmits the control packet to the packet communication device 100.
【0053】
The communication unit 106 receives the control packet (including the switching confirmation) transmitted from the packet communication device 200, and supplies the switching confirmation included in the control packet to the control unit 109. After receiving the switching confirmation, the control unit 109 stops the process of encoding the audio and / or video signal by the first coding method.
【0054】
Next, the processing procedure of step S406 will be described. The selection unit 103 supplies the audio and / or video signal output from the input unit 102 to the second coding unit 104-2 according to the instruction from the control unit 109, but the first coding unit 104-1 Do not supply to. Further, the selection unit 105 supplies the coded data 813 output from the second coding unit 104-2 to the communication unit 106 in accordance with the instruction from the control unit 109. The communication unit 106 sequentially generates a data packet 810 including the coded data 813, and sequentially transmits these to the packet communication device 200. Since the packet communication device 200 has already switched the coding method from the first coding method to the second coding method, the data packet 810 transmitted from the packet communication device 100 can be decoded without any trouble. , The generation of abnormal noise, the disturbance of the image, the interruption of the sound and / or the image can be prevented.
【0055】
Next, the main processing procedure of the packet communication device 100 (transmitting side) in the first embodiment will be described with reference to the flowchart of FIG.
【0056】
In step S501, the control unit 109 determines whether or not it is necessary to switch the coding method from the first coding method to the second coding method. When switching the coding method, this flowchart proceeds to step S503. On the other hand, when the coding method is not switched, this flowchart proceeds to step S502.
【0057】
In step S502, the control unit 109 determines whether or not a control packet including the switching request has been received. When the switching request is received, this flowchart proceeds to step S504. On the other hand, if the switching request has not been received, this flowchart returns to step S501.
【0058】
Next, the processing procedure of step S503 of FIG. 5 will be described with reference to the flowchart of FIG.
【0059】
In step S601, the control unit 109 starts preparations for encoding the audio and / or video signals having the same contents by the coding method before switching and the coding method after switching.
【0060】
In step S602, the control unit 109 determines whether or not a predetermined time T1 (a time sufficient for the coding process of the coding unit 104-1 to stabilize) has elapsed. When the predetermined time has elapsed, this flowchart proceeds to step S603.
【0061】
In step S603, the control unit 109 supplies the switching request to the communication unit 106. The communication unit 106 generates a control packet including a switching request and transmits the control packet to the packet communication device 200. After transmitting the switching request, the communication unit 106 transmits the audio and / or video signal encoded by the coding method before switching and the audio and / or video signal encoded by the coding method after switching. Start.
【0062】
In step S604, the control unit 109 determines whether or not the control packet including the switching response can be received within a certain period of time. If the switching response can be received, this flowchart proceeds to step S606. On the other hand, if the switching response cannot be received, this flowchart proceeds to step S605.
【0063】
In step S605, the control unit 109 controls to transmit the audio and / or video signal encoded by the coding method before switching to the packet communication device 200, and is encoded by the coding method after switching. Control so that audio and / or video signals are not transmitted to the packet communication device 200.
【0064】
In step S606, the control unit 109 controls so that the audio and / or video signal encoded by the coding method before switching is not transmitted to the packet communication device 200, and is encoded by the coding method after switching. Controls to transmit audio and / or video signals to the packet communication device 200.
【0065】
In step S607, the control unit 109 supplies the switching confirmation to the communication unit 106. The communication unit 106 generates a control packet including a switching confirmation and transmits the control packet to the packet communication device 200.
【0066】
Next, the processing procedure of step S504 of FIG. 5 will be described with reference to the flowchart of FIG. 7.
【0067】
In step S701, the control unit 109 starts preparations for encoding the audio and / or video signals having the same contents by the coding method before switching and the coding method after switching.
【0068】
In step S702, the control unit 109 determines whether or not a predetermined time T1 (a time sufficient for the coding process of the coding unit 104-1 to stabilize) has elapsed. When the predetermined time has elapsed, this flowchart proceeds to step S703.
【0069】
In step S703, the control unit 109 supplies the switching response to the communication unit 106. The communication unit 106 generates a control packet including a switching response and transmits the control packet to the packet communication device 200. After transmitting the switching response, the communication unit 106 transmits the audio and / or video signal encoded by the coding method before switching and the audio and / or video signal encoded by the coding method after switching. Start.
【0070】
In step S704, the control unit 109 determines whether or not the control packet including the switching confirmation can be received within a certain time. If the switching confirmation is received, this flowchart proceeds to step S706. On the other hand, if the switching confirmation cannot be received, this flowchart proceeds to step S705.
【0071】
In step S705, the control unit 109 controls to transmit the audio and / or video signal encoded by the coding method before switching to the packet communication device 200, and is encoded by the coding method after switching. Control so that audio and / or video signals are not transmitted to the packet communication device 200.
【0072】
In step S706, the control unit 109 controls so that the audio and / or video signal encoded by the coding method before switching is not transmitted to the packet communication device 200, and is encoded by the coding method after switching. Controls to transmit audio and / or video signals to the packet communication device 200.
【0073】
As described above, according to the first embodiment, even when the coding method is switched during communication with the communication partner, abnormal noise is generated, video is disturbed, audio and / or video is interrupted. Can be prevented.
【0074】
Further, according to the first embodiment, since the audio and / or video signal encoded by the coding method after switching is not transmitted until the coding process is stable, the coding method for feeding back the past information. Even when switching between, it is possible to prevent the generation of abnormal noise, the distortion of the image, and the interruption of the audio and / or the image.
【0075】
Further, according to the first embodiment, the audio and / or video signal encoded by the coding method after switching can be transmitted without connecting a new call, so that a complicated communication procedure can be performed. Can be eliminated and communication efficiency can be improved.
【0076】
(Second Embodiment) In the first embodiment, the audio and / or video signal encoded by the coding method before switching and the audio and / or video signal encoded by the coding method after switching. The case where the video signal and the video signal are packetized into separate data packets has been described.
【0077】
On the other hand, in the second embodiment, the audio and / or video signal encoded by the coding method before switching and the audio and / or video signal encoded by the coding method after switching are used. A case of packetizing into the same data packet will be described.
【0078】
Next, the configuration of the data packet in the second embodiment will be described with reference to FIG.
【0079】
As shown in FIG. 9, the data packet 900 in the second embodiment is composed of a header 901, a coding method information 802, a coding data 803, a coding method information 812, a coded data 813, and a footer 904. .. The header 901 includes information for specifying the communication destination and the like. The coding method information 802 includes information indicating the coding method of the coded data 803 and the corresponding decoding method. The coded data 803 includes an audio and / or video signal encoded by the coding method before switching (for example, the first coding method included in the first coding unit 104-1). The coding method information 812 includes information indicating the coding method of the coded data 813 and the corresponding decoding method. The coded data 813 includes an audio and / or video signal encoded by a coded method after switching (for example, a second coding method provided in the second coding unit 104-2). The footer 904 includes information and the like for detecting or correcting an error occurring in a data packet.
【0080】
Next, an example of the main processing procedures of the packet communication devices 100 and 200 according to the second embodiment will be described with reference to FIG. FIG. 10 describes a processing procedure when the packet communication device 100 (sender side) requests switching of the coding method during communication with the packet communication device 200 (reception side). Further, in FIG. 10, the coding method before switching is, for example, the first coding method included in the first coding unit 104-1, and the coding method after switching is, for example, the second coding unit 104-2. A case of using the second coding method provided in the above will be described. In FIG. 10, a processing procedure different from the processing procedure shown in FIG. 3 will be described in detail, and the same processing procedure as in FIG. 3 will be designated by the same reference numerals as those in FIG. 3 and the description thereof will be omitted.
【0081】
The processing procedure of step S1001 will be described. The selection unit 105 communicates the coded data 803 output from the first coding unit 104-1 and the coded data 813 output from the second coding unit 104-2 according to the instruction from the control unit 109. Supply to unit 106. The communication unit 106 sequentially generates a data packet 900 including the coded data 803 and the coded data 813, and sequentially transmits them to the packet communication device 200. The communication unit 106 starts transmitting the data packet 900 without connecting a new call to the packet communication device 200.
【0082】
The communication unit 206 sequentially receives the data packet 900 transmitted from the packet communication device 100, supplies the coded data 803 and the coded data 813 to the selection unit 205, and supplies the coding method information 802 and 813 to the control unit 209. .. The control unit 209 discriminates between the coding method of the coded data 803 and the corresponding decoding method by the coding method information 802, and the coding method of the coded data 813 and the corresponding decoding by the coding method information 812. Determine the conversion method. The selection unit 205 supplies the coded data 803 to the first decoding unit 204-1 and the coded data 813 to the second decoding unit 204-2 according to the instruction from the control unit 209. The selection unit 203 supplies the audio and / or video signal output from the first decoding unit 204-1 to the output unit 202 according to the instruction from the control unit 209, but the second decoding unit 204-2 The audio and / or video signal output from is not supplied to the output unit 202. In addition, the selection unit 203 is the sound output from the second decoding unit 204-2 until a predetermined time T2 (a time sufficient for the operation of the second coding unit 104-2 to stabilize) elapses. And / or do not supply the video signal to the output unit 202.
【0083】
Next, another example of the main processing procedure of the packet communication devices 100 and 200 according to the second embodiment will be described with reference to FIG. FIG. 11 describes a processing procedure when the packet communication device 200 (reception side) requests switching of the coding method during communication with the packet communication device 100 (sending side). Further, in FIG. 11, as in the description of FIG. 4, the coding method before switching is, for example, the first coding method provided in the first coding unit 104-1, and the coding method after switching is, for example, the first. A case where the second coding method provided in the coding unit 104-2 of 2 is used will be described. Note that FIG. 11 describes in detail a processing procedure different from the processing procedure shown in FIG. 4, and the same processing procedure as in FIG. 4 is designated by the same reference numerals as those in FIG. 4 and the description thereof will be omitted.
【0084】
The processing procedure of step S1101 will be described. The selection unit 105 communicates the coded data 803 output from the first coding unit 104-1 and the coded data 813 output from the second coding unit 104-2 according to the instruction from the control unit 109. Supply to unit 106. The communication unit 106 sequentially generates a data packet 900 including the coded data 803 and the coded data 813, and sequentially transmits them to the packet communication device 200. The communication unit 106 starts transmitting the data packet 900 without connecting a new call to the packet communication device 200.
【0085】
The communication unit 206 sequentially receives the data packet 900 transmitted from the packet communication device 100, supplies the coded data 803 and the coded data 813 to the selection unit 205, and supplies the coding method information 802 and 813 to the control unit 209. .. The control unit 209 discriminates between the coding method of the coded data 803 and the corresponding decoding method by the coding method information 802, and the coding method of the coded data 813 and the corresponding decoding by the coding method information 812. Determine the conversion method. The selection unit 205 supplies the coded data 803 to the first decoding unit 204-1 and the coded data 813 to the second decoding unit 204-2 according to the instruction from the control unit 209. The selection unit 203 supplies the audio and / or video signal output from the first decoding unit 204-1 to the output unit 202 according to the instruction from the control unit 209, but the second decoding unit 204-2 The audio and / or video signal output from is not supplied to the output unit 202. In addition, the selection unit 203 is the sound output from the second decoding unit 204-2 until a predetermined time T2 (a time sufficient for the operation of the second coding unit 104-2 to stabilize) elapses. And / or do not supply the video signal to the output unit 202.
【0086】
As described above, according to the second embodiment, as in the first embodiment, even when the coding method is switched during communication with the communication partner, abnormal noise is generated and the image is displayed. Disturbance, audio and / or video interruptions can be prevented.
【0087】
Further, according to the second embodiment, the audio and / or video signal encoded by the coding method before switching and the audio and / or video signal encoded by the coding method after switching are used. Since the same data packet can be packetized, the communication efficiency can be improved as compared with the first embodiment.
【0088】
Further, according to the second embodiment, as in the first embodiment, the decoding method is not switched until the decoding process of the decoding method after switching is stable, so that the decoding method after switching is performed. Is a decoding method that feeds back past information, it is possible to prevent generation of abnormal noise, distortion of video, and interruption of audio and / or video.
【0089】
Further, according to the second embodiment, the audio and / or video signal encoded by the coding method after switching can be transmitted without connecting a new call, so that a complicated communication procedure can be performed. Can be eliminated and communication efficiency can be improved.
【0090】
In the above-described embodiment, the case where the coding method before switching is the first coding method and the coding method after switching is the second coding method has been described. Not limited. In the present invention, the coding method before switching is the a (a = 1 to N) th coding method, and the coding method after switching is the b (b = 1 to N, b a) th coding method. It is also possible to.
【0091】
[Effect of the invention]
As described above, according to the present invention, even when the coding method is switched during communication with the communication partner, it is possible to prevent the generation of abnormal noise, the disturbance of the image, and the interruption of the audio and / or the image. Can be done.
[Simple explanation of drawings]
[Figure 1]
It is a block diagram which shows the main structure of the packet communication apparatus (transmitting side) in 1st Embodiment.
[Figure 2]
It is a block diagram which shows the main structure of the packet communication apparatus (reception side) in 1st Embodiment.
[Fig. 3]
It is a figure explaining an example of the main processing procedure of the packet communication apparatus in 1st Embodiment.
[Fig. 4]
It is a figure explaining another example of the main processing procedure of the packet communication apparatus in 1st Embodiment.
[Fig. 5]
It is a flowchart explaining the main processing procedure of the packet communication apparatus in 1st Embodiment.
[Fig. 6]
It is a flowchart explaining the main processing procedure of the packet communication apparatus in 1st Embodiment.
[Fig. 7]
It is a flowchart explaining the main processing procedure of the packet communication apparatus in 1st Embodiment.
[Fig. 8]
It is a figure which shows the structure of the data packet in 1st Embodiment.
[Fig. 9]
It is a figure which shows the structure of the data packet in 2nd Embodiment.
[Fig. 10]
It is a figure explaining an example of the main processing procedure of the packet communication apparatus in 2nd Embodiment.
[Fig. 11]
It is a figure explaining another example of the main processing procedure of the packet communication apparatus in 2nd Embodiment.
[Explanation of symbols]
100,200 packet communication device 102 Input section 103,105,203,205 Selection 104-i (i = 1 ~ N) coding unit 106,206 Communication Department 109,209 Control unit 112 Packet network 113,213 Video processing equipment 114,214 Operation unit 115,215 Timekeeping 202 Output 204i (i = 1 ~ N) Decoding unit
Every citation, both ways
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| JP2013535122A | Cited by | Japan | Examiner |
| JP2007259056A | Cited by | Japan | Examiner |
| JP2013062776A | Cited by | Japan | Examiner |
| JP2010512105A | Cited by | Japan | Examiner |
| JP2012194574A | Cited by | Japan | Search report |
| US9237172B2 | Cited by | United States of America | Applicant |
| WO2005099243A1 | Cited by | World Intellectual Property Organization (WIPO) | International search |
| JP2013062776A | Cited by | Japan | Search report |
| JP2007508737A | Cited by | Japan | Examiner |
| JP2000032447A | Cites | Japan | Examiner |
| US2001033237A1 | Cites | United States of America | Search report |
| US6507611B1 | Cites | United States of America | Search report |
| US6754439B1 | Cites | United States of America | Search report |
| JPH08256063A | Cites | Japan | Search report |
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| 2000124808 | Japan | A | |
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Members3
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| US2001033325A1 | United States of America | A1 | |
| JP2002247137AThis record | Japan | A | |
| US7058078B2 | United States of America | B2 |
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Over the term
Point at a mark for the eventEvents
| Event | Code | |
|---|---|---|
| Decision of refusalJAPANESE INTERMEDIATE CODE: A02A02 | A02 | |
| Notification of change of attorneyJAPANESE INTERMEDIATE CODE: A7421RD01 | RD01 | |
| Notification of reasons for refusalJAPANESE INTERMEDIATE CODE: A131A131 | A131 | |
| Notification of resignation of power of attorneyJAPANESE INTERMEDIATE CODE: A7424RD04 | RD04 | |
| Written amendmentJAPANESE INTERMEDIATE CODE: A523A521 | A521 | |
| Written request for application examinationJAPANESE INTERMEDIATE CODE: A621A621 | A621 |
Numbers
- Publication
- 2002-247137
- Publication, DOCDB
- 2002247137
- Publication, EPODOC
- JP2002247137
- Application
- 92387
- Application, DOCDB
- 2001092387
- Application, EPODOC
- JP20010092387
Titles2
- Japanese
- 【発明の名称】通信装置及び通信方法
- English
- [Title of Invention] Communication device and communication method
Classification
- CPC, 2
- H04N21/643
- H04N7/141
- IPC, 9
- H04N19 46
- G10L19 00
- H04L29 08
- H04N7 14
- H04N7 24
- H04N19 00
- H04N19 40
- H04N19 70
- H04N21 643