Mobile radio terminal

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a mobile wireless terminal capable of accumulating transmitted voice and received voice.

【0002】

[Conventional technology]

A conventional mobile wireless terminal will be described with reference to FIGS. 6 to 8. As shown in these figures, a conventional mobile wireless terminal is configured to transmit and receive a wireless signal to and from a base station (not shown) through an antenna 103, and a receiving circuit 101 digitizes the wireless signal received by the antenna 103. The received received data is demolished, and the audio data (hereinafter referred to as the received audio data) is separated from the demodulated result.

【0003】

The voice decoder 105 converts the received voice data input via the switch 112 into an analog voice signal, and the amplifier 108 amplifies the analog voice signal. The audio signal amplified here is loudly output from the receiver 110.

【0004】

On the other hand, the user's voice is converted into an electric signal by the microphone 111, and this electric signal is amplified by the amplifier 109. The amplified electric signal is converted into voice data of a digital signal (hereinafter referred to as transmitted voice data) by the voice encoder 106. The transmission circuit 102 modulates the carrier signal using the transmitted voice data, and outputs the radio signal obtained by this modulation to the antenna 103.

【0005】

The storage circuit 104 is composed of a semiconductor memory or the like, and under the control of the control unit 100 that controls and controls each part of the mobile wireless terminal, the received voice data for a predetermined time is recorded and stored in association with the frame identification information. Is what you do. Further, the received voice data recorded here is read and controlled by the control unit 100 according to the user's request.

【0006】

Further, the switch 112 selectively inputs the received voice data to the storage circuit 104 or inputs the received voice data read from the storage circuit 104 to the voice decoder 105 by the switching control of the control unit 100.

【0007】

First, during a normal call, as shown in FIG. 6, the control unit 100 switches and controls the switch 112 so that the received voice data separated by the receiving circuit 101 is output to the voice decoder 105.

【0008】

Further, when recording the voice of the communication partner during a call, the control unit 100 receives the received voice data separated by the receiving circuit 101 as shown in FIG. 7 in response to the user's request to the voice decoder 105 and the storage circuit. The switch 112 is switched and controlled so as to output to 104, and the received voice data is recorded in the storage circuit 104.

【0009】

Then, when the received voice data recorded in the storage circuit 104 is reproduced, the control unit 100 receives the received voice data read from the storage circuit 104 into the voice decoder 105 as shown in FIG. 8 in response to the user's request. The switch 112 is switched and controlled so as to output, and the above-mentioned received voice data is loudly output.

【0010】

The conventional mobile wireless terminal configured as described above has a problem that only the voice of the communication partner can be recorded. In order to solve this problem, the mobile wireless terminals shown in FIGS. 9 to 11 can record the voice of a bidirectional user.

【0011】

A radio signal is transmitted to and received from a base station (not shown) through the antenna 203, and the receiving circuit 201 demolishes the digitized received data from the radio signal received by the antenna 203, and the audio data (hereinafter referred to as voice data) is demoted from the demoted result. Separate the received voice data).

【0012】

The voice decoder 205 converts the received voice data or the transmitted / received voice data input via the switch 212 into an analog voice signal, and the amplifier 208 amplifies the analog voice signal. The audio signal amplified here is loudly output from the receiver 210.

【0013】

On the other hand, the user's voice is converted into an electric signal by the microphone 211, and this electric signal is amplified by the amplifier 209. This amplified electric signal is converted into digital signal audio data (hereinafter referred to as transmitted audio data) by the audio encoder 206b, then modulated into a wireless signal by the transmission circuit 202, and is modulated into the radio signal by the antenna 203. It is output.

【0014】

The adder circuit 207 adds the analog audio signal output from the audio decoder 205, that is, the analog audio signal of the communication partner, and the electric signal amplified by the amplifier 209, that is, the user's analog audio signal, to the audio encoder 206a. Output.

【0015】

The audio encoder 206a converts the analog audio signal input from the adder circuit 207 into digital signal audio data (hereinafter referred to as transmitted / received audio data), and outputs the analog audio signal to the storage circuit 204 via the switch 212.

【0016】

The storage circuit 204 is composed of a semiconductor memory or the like, and under the control of the control unit 200 that controls and controls each part of the mobile wireless terminal, the transmitted / received voice data for a predetermined time is recorded in association with the frame identification information. It is to be saved. Further, the received voice data recorded here is read and controlled by the control unit 200 according to the user's request.

【0017】

Further, the switch 212 selectively inputs the transmitted / received voice data to the storage circuit 204 by the switching control of the control unit 200, or reads the received voice data separated by the receiving circuit 203 or the storage circuit 204. The transmitted / received voice data is selectively input to the voice decoder 205.

【0018】

First, during a normal call, as shown in FIG. 9, the control unit 200 switches and controls the switch 212 so that the received voice data separated by the receiving circuit 201 is output to the voice decoder 205.

【0019】

Further, when recording a conversation made during a call, the control unit 200 sends the received voice data separated by the receiving circuit 201 to the voice decoder 205 as shown in FIG. 10 in response to the user's request. At the same time, the switch 212 is switched and controlled so that the transmitted / received voice data generated by the voice encoder 206a is output to the storage circuit 204, and the transmitted / received voice data is recorded in the storage circuit 204.

【0020】

Then, when listening to the recorded conversation, that is, playing back the transmitted voice data and the received voice data recorded in the storage circuit 204, the control unit 100 shows in FIG. 11 in response to the user's request. As described above, the switch 212 is switched and controlled so that the transmitted / received voice data read from the storage circuit 204 is output to the voice decoder 205, and the transmitted / received voice data is loudly output.

【0021】

According to the mobile wireless terminal shown in FIGS. 9 to 11, not only the voice of the communication partner but also the voice of the user can be recorded / reproduced. However, in a mobile wireless terminal having such a configuration, since it is necessary to operate the voice decoder 205 and the voice encoders 206a and 206b at the same time during recording, the DSP (Digital Signal Processor) that realizes these functions has a large processing capacity. Not only is it required, but there is also the problem that the maximum current consumption is large. Further, the recorded received voice data has a drawback that the sound quality is deteriorated because the decoded voice data is encoded again.

【0022】

[Problems to be Solved by the Invention]

In a conventional mobile wireless terminal, one voice decoder and two voice encoders need to be operated at the same time when recording a conversation. Therefore, the DSP that realizes these functions is required to have a large processing capacity and the maximum current consumption. There is a problem that is large. Further, the recorded received voice data has a drawback that the sound quality is deteriorated because the decoded voice data is encoded again.

【0023】

The present invention has been made to solve the above problems, and it is possible to record a conversation with a communication partner by reducing the load on the DSP responsible for processing voice data and the maximum current consumption, and to record a conversation with the communication partner. An object of the present invention is to provide a mobile wireless terminal capable of improving the quality of recorded voice.

【0024】

[Means for solving problems]

In order to achieve the above object, the present invention provides a receiving means for receiving a radio signal and extracting the voice data of the communication partner as the received voice data from the received radio signal, and the user's voice as the transmitted voice data. The encoding means to be encoded, the transmission means for transmitting a radio signal addressed to the communication partner by using the transmitted voice data encoded by the coding means, and the received voice data and the transmitted voice data can be stored, respectively. Storage means, the first decoding means for decoding the encoded voice data and the received voice data into an analog voice signal, and the second decoding means for decoding the encoded voice data and the received voice data into an analog voice signal. The decoding means, the analog voice signal decoded by the first decoding means, and the analog voice signal decoded by the second decoding means are added and output as a loudspeaker. The received voice data extracted by the above is input to the first decoding means, and at the time of recording, the received voice data extracted by the receiving means and the transmitted voice data generated by the coding means are recorded in the pre-storage means and reproduced. Occasionally, it is configured to include a control means for inputting the received voice data recorded in the storage means to the first decoding means and inputting the transmitted voice data recorded in the storage means to the second decoding means. did.

【0025】

In the mobile wireless terminal having the above configuration, the received voice data extracted by the receiving means and the transmitted voice data generated by the coding means are recorded in the storage means at the time of recording, and the received voice recorded in the storage means is recorded at the time of reproduction. The data is input to the first decoding means, and the transmitted voice data recorded in the storage means is input to the second decoding means.

【0026】

Therefore, according to the mobile wireless terminal having the above configuration, the configuration related to the processing of the voice data of the first decoding means, the second decoding means, and the coding means can be performed at any time of a call, a recording, or a reproduction. Since it is necessary to operate only two means at the maximum, the load required for processing the voice data is low, and the maximum current consumption can be reduced. Further, since unnecessary voice coding and decoding processing can be omitted, deterioration of sound quality can be prevented.

【0027】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 3 show a configuration of a mobile wireless terminal according to an embodiment of the present invention.

【0028】

A radio signal is transmitted to and received from a base station (not shown) through the antenna 3, and the receiving circuit 1 democratizes the digitized received data from the radio signal received by the antenna 3, and the audio data (hereinafter referred to as audio data) is derived from this demodulation result. Separate the received voice data).

【0029】

The DSP2000 is a DSP (Digital Signal Processor) that functions as a voice decoder 5a, 5b and a voice encoder 6 in response to a request from a control unit 1000 that controls each part of the mobile wireless terminal.

【0030】

The voice decoder 5a converts the received voice data input via the switch 12 into an analog voice signal. The voice decoder 5b converts the transmitted voice data input from the storage circuit 4 via the switch 12 into an analog voice signal.

【0031】

The adder circuit 7 adds the analog audio signal converted by the audio decoder 5a and the analog audio signal converted by the audio decoder 5b, and outputs the analog audio signal to the amplifier 8. The amplifier 8 amplifies the analog audio signal added by the addition circuit 7. The audio signal amplified here is loudly output from the receiver 10.

【0032】

On the other hand, the user's voice is converted into an electric signal by the microphone 11, and this electric signal is amplified by the amplifier 9. The amplified electric signal is converted into digital signal voice data (hereinafter referred to as transmitted voice data) by the voice encoder 6, and then output to the transmission circuit 2 and the switch 12. The transmission circuit 2 modulates the carrier signal using the transmitted voice data, and outputs the radio signal obtained by this modulation to the antenna 3.

【0033】

The storage circuit 4 is composed of a semiconductor memory or the like, and under the control of the control unit 1000, the received voice data input via the switch 12 and the transmitted voice data are associated with each other in the format shown in FIG. It is for recording and saving.

【0034】

As shown in this figure, in the storage circuit 4, the received voice data and the transmitted voice data are provided with a Header indicating the boundary of the voice frame, which is a processing unit of the voice codec, and a temporal correspondence between the two data. The "Frame No" indicating and the "Bit Length" indicating the number of bits in the audio frame of each data are added and recorded respectively. Further, the received voice data and the transmitted voice data recorded here are read and controlled by the control unit 1000 according to the user's request.

【0035】

The audio decoders 5a and 5b and the audio encoder 6 are assumed to use a variable rate codec as the audio codec. Therefore, the received voice data and the transmitted voice data have different coding rates for each voice frame, so that the number of bits in the voice frame is variable.

【0036】

In this case, the above-mentioned "Bit Length" becomes information indicating the number of bits of the audio frame and the coding rate, and is used as information at the time of decoding. In addition, the above "Frame No" can manage the time of the recorded message by associating it with the RTC (Real Time Clock) in the device.

【0037】

The switch 12 inputs the received voice data separated by the receiving circuit 1 to the voice decoder 5a during a call by the switching control of the control unit 1000, and receives the received voice data when recording the conversation made during the call. The received voice data separated by the circuit 1 and the transmitted voice data obtained by the voice encoder 6 are input to the storage circuit 4.

【0038】

Further, when the switch 12 listens to the conversation recorded in the storage circuit 4 by the switching control of the control unit 1000, that is, reproduces the recorded voice data, the switch 12 voices the received voice data read from the storage circuit 4. In addition to inputting to the decoder 5a, the transmitted / received voice data read from the storage circuit 4 is input to the voice decoder 5b.

【0039】

Next, the operation of the mobile wireless terminal having the above configuration will be described. First, a normal call will be described. In this case, the control unit 1000 requests the DSP 2000 to function as the voice decoder 5a and the voice encoder 6, and as shown in FIG. 1, the switch 12 is switched and controlled and separated by the receiving circuit 1. The received voice data is output to the voice decoder 5a.

【0040】

By such switching control of the switch 12, the received voice data separated by the receiving circuit 1 is converted into an analog voice signal by the voice decoder 5a, amplified by the amplifier 8, and then loudly output from the receiver 10. To.

【0041】

On the other hand, the user's voice is converted into an electric signal by the microphone 11 and amplified by the amplifier 9. Then, the amplified electric signal is converted into transmitted voice data by the voice encoder 6 and then output to the transmission circuit 2. Then, the transmission circuit 2 modulates the carrier signal using the transmitted voice data, and transmits the radio signal obtained by this modulation to the base station through the antenna 3.

【0042】

Next, a case of recording a conversation made during a call will be described. In this case, the control unit 1000 requests the DSP 2000 to function as the voice decoder 5a and the voice encoder 6, and as shown in FIG. 2, the switch 12 is switched and controlled and separated by the receiving circuit 1. The received received voice data is output to the storage circuit 4 and the voice decoder 5a, and the transmitted voice data generated by the voice encoder 6 is output to the transmission circuit 2 and the storage circuit 4.

【0043】

By such switching control of the switch 12, the received voice data separated by the receiving circuit 1 is converted into an analog voice signal by the voice decoder 5a, amplified by the amplifier 8, and then loudly output from the receiver 10. To. In parallel with this, the received voice data separated by the receiving circuit 1 is recorded in the storage circuit 4 by the recording control of the control unit 1000. On the other hand, the transmitted voice data is used for modulation of the carrier wave signal in the transmission circuit 2, and is recorded in the storage circuit 4 by the recording control of the control unit 1000.

【0044】

In the recording control of the received voice data and the transmitted voice data by the control unit 1000, the temporal correspondence between the two data and the information indicating the coding rate of each data are associated with each other by the format shown in FIG. And recorded.

【0045】

Next, a case of listening to the recorded conversation, that is, reproducing the transmitted voice data and the received voice data recorded in the storage circuit 4 will be described. In this case, the control unit 1000 requests the DSP 2000 to function as the voice decoders 5a and 5b, and as shown in FIG. 3, switches and controls the switch 12 to read the received voice read from the storage circuit 4. The data is output to the voice decoder 5a, and the transmitted voice data read from the storage circuit 4 is output to the voice decoder 5b.

【0046】

By such switching control of the switch 12, the received voice data read from the storage circuit 4 is converted into an analog voice signal by the voice decoder 5a, while the transmitted voice data read from the storage circuit 4 is converted into an analog voice signal. , Converted to analog audio signal by audio decoder 5b.

【0047】

Then, the analog audio signals converted by the audio decoders 5a and 5b are added by the adder circuit 7, amplified by the amplifier 8, and then loudly output from the receiver 10. When the control unit 1000 reads the received voice data and the transmitted voice data from the storage circuit 4, the control unit 1000 refers to the Frame No recorded in association with each data and sets the voice decoders 5a and 5b. Read control is performed so that the converted analog voice signals are time-matched by the addition of the addition circuit 7.

【0048】

As described above, in the mobile wireless terminal having the above configuration, when recording the conversation, the received voice data separated by the receiving circuit 1 and the transmitted voice data generated by the voice encoder 6 are stored. Each is recorded in the storage circuit 4 independently.

【0049】

Further, when listening to the recorded conversation, that is, when playing back the transmitted voice data and the received voice data recorded in the storage circuit 4, the received voice data and the transmitted voice data read from the storage circuit 4 are used. , The audio decoders 5a and 5b convert them into analog audio signals, and the adder circuit 7 adds them to output loudspeakers. Therefore, according to the mobile wireless terminal having the above configuration, the DSP2000 needs to operate only two functions of the voice decoders 5a and 5b and the voice encoder 6 at the same time. The required load is low, and the maximum current consumption can be reduced.

【0050】

Further, since the received voice data recorded in the storage circuit 4 is not subjected to the process of re-encoding the decoded one as in the conventional case, the sound quality is not deteriorated.

【0051】

The present invention is not limited to the above embodiment. For example, the configuration shown in FIG. 5 can be considered.

【0052】

The mobile wireless terminal shown in this figure has the same operations as those in the above-described embodiment during a call and when recording a conversation, but the operations when listening to the recorded conversation are different.

【0053】

In the configuration shown in FIG. 5, the control unit 1001 alternately reads out the transmitted voice data and the received voice data from the storage circuit 4 in a time division manner at twice the speed of the control unit 1000 of the above-described embodiment. The audio decoder 5c converts each of them into analog audio signals in a time division manner, synthesizes these analog audios in consideration of the temporal correspondence, and outputs the loudspeakers through the amplifier 8 and the receiver 10.

【0054】

Even with such a configuration, similarly to the above-described embodiment, the DSP 2001 requires a lower load on the DSP 2000 that performs voice processing than the conventional one, and the maximum current consumption can also be reduced.

【0055】

The present invention is not limited to the above embodiment. In addition, it goes without saying that various modifications can be made in the same manner without departing from the gist of the present invention.

【0056】

[Effect of the invention]

As described above, in the present invention, the received voice data extracted by the receiving means and the transmitted voice data generated by the coding means are recorded in the storage means at the time of recording, and recorded in the storage means at the time of reproduction. The received voice data is input to the first decoding means, and the transmitted voice data recorded in the storage means is input to the second decoding means.

【0057】

Therefore, according to the present invention, the configuration related to the processing of the voice data of the first decoding means, the second decoding means, and the coding means has a maximum of 2 at the time of a call, a recording, and a reproduction. Since it is necessary to operate only one means, it is possible to provide a mobile wireless terminal in which the load required for processing voice data is low and the maximum current consumption can be reduced.

[Simple explanation of drawings]

[Figure 1]

The circuit block diagram which shows the structure of one Embodiment of the mobile wireless terminal which concerns on this invention.

[Figure 2]

The circuit block diagram which shows the structure of one Embodiment of the mobile wireless terminal which concerns on this invention.

[Fig. 3]

The circuit block diagram which shows the structure of one Embodiment of the mobile wireless terminal which concerns on this invention.

[Fig. 4]

The figure for demonstrating the data format recorded in the storage circuit of the mobile wireless terminal shown in FIG.

[Fig. 5]

The circuit block diagram which shows the structure of the other embodiment of the mobile wireless terminal which concerns on this invention.

[Fig. 6]

The circuit block diagram which shows the structure of the conventional mobile wireless terminal.

[Fig. 7]

The circuit block diagram which shows the structure of the conventional mobile wireless terminal.

[Fig. 8]

The circuit block diagram which shows the structure of the conventional mobile wireless terminal.

[Fig. 9]

The circuit block diagram which shows the structure of the conventional mobile wireless terminal.

[Fig. 10]

The circuit block diagram which shows the structure of the conventional mobile wireless terminal.

[Fig. 11]

The circuit block diagram which shows the structure of the conventional mobile wireless terminal.

[Explanation of symbols]

1 ... Receive circuit 2 ... Transmission circuit 3 ... antenna 4 ... Memory circuit 5a, 5b, 5c ... Audio decoder 6 ... Audio encoder 7 ... Addition circuit 8,9 ... amplifier 10 ... receiver 11 ... Microphone 12 ... switch 1000,1001 ... Control unit 2000,2001 ... DSP