Digital broadcast reception system, transmitter and receiver thereof

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a transmission / reception system, a transmission device, and a reception device used in digital broadcasting.

【0002】

[Conventional technology]

Currently, television broadcasting is analog broadcasting, but various developments and researches are being carried out for digital broadcasting that will start in the near future.

【0003】

[Problems to be Solved by the Invention]

For example, in analog broadcasting, non-real-time information signals such as still images and sentences used in character broadcasting and data broadcasting are inserted at a fixed position called the vertical blanking period in the NTSC type television signal. Although it does not conflict with real-time information signals such as moving images and announcement voices, in digital broadcasting, real-time information and non-real-time information are sent in exactly the same transmission path and the same packet data (for example, fixed-length data) format. Since it is necessary to transmit at the same time, the problem is at what transmission timing both information are transmitted.

【0004】

The present invention has been made in view of the above points, and provides a transmission / reception system, a transmission device, and a reception device for digital broadcasting that enable transmission of real-time information and non-real-time information without conflict in digital broadcasting. The purpose is.

【0005】

[Means for solving problems]

In order to achieve the above object, the digital broadcasting transmission / reception system according to the present invention transmits the real-time information signal and the non-real-time information signal composed of data having the same fixed length, respectively. A transmission device that preferentially transmits a signal and transmits the non-real-time information signal in the time gap of the real-time information signal, and a transmission device that receives the information signal transmitted by the transmission device and receives the real-time information signal. It is characterized by including a receiving device that separates the signal from the non-real time information signal and the non-real time information signal.

【0006】

Further, the transmission device for digital broadcasting according to the present invention receives a real-time information signal composed of packet data for real-time information to be actually transmitted and dummy packet data as a gap between the data, and each receives the real-time information signal. Each packet data is temporarily stored by receiving a non-real-time information signal composed of a real-time information temporary storage means for temporarily storing packet data and packet data for non-real-time information to be actually transmitted. Non-real-time information temporary storage means for this purpose, switching means for selectively outputting each packet data stored in the real-time information temporary storage means and the non-real-time information temporary storage means, and the real-time information. If the packet data stored in the temporary storage means is not the dummy packet data, the switching means is controlled so as to output the packet data, and the packet data stored in the real-time information temporary storage means is the dummy packet. When it is data, it is characterized by including a control means for controlling the switching means so as to output the packet data stored in the non-real time information temporary storage means instead of the packet data.

【0007】

Further, in the digital broadcasting receiving device according to the present invention, a real-time information signal composed of data having a predetermined fixed length is preferentially transmitted, and the time gap of the real-time information signal is set to the predetermined fixed length. A receiving device that receives an information signal transmitted in a format in which a non-real-time information signal composed of data having the same fixed length is transmitted, and temporarily stores each packet data constituting the real-time information signal. Real-time information temporary storage means for temporary storage, non-real-time information temporary storage means for temporarily storing each packet data constituting the non-real-time information signal, and the above-mentioned real-time information temporary storage means and non-real-time information temporary storage. Non-real-time information as to whether the switching means for selectively supplying each packet data in the received information signal to the means and whether each packet data in the received information signal constitutes real-time information. If it is packet data that constitutes real-time information, the switching means is controlled so as to supply the packet data to the real-time information temporary storage means, and non-real-time information. In the case of packet data constituting the above, it is characterized by including a control means for controlling the switching means so as to supply the packet data to the non-real time information temporary storage means.

【0008】

That is, according to the transmission / reception system for digital broadcasting, the transmission device, and the reception device of the present invention, when transmitting a real-time information signal and a non-real-time information signal composed of data having the same fixed length, the transmission device is used. , The real-time information signal is preferentially transmitted, and the non-real-time information signal is transmitted in the time gap of the real-time information signal. Then, the receiving device receives the transmitted information signal and separates it into a real-time information signal and a non-real-time information signal.

【0009】

Here, the transmitting device receives a real-time information signal composed of packet data for real-time information to be actually transmitted and dummy packet data as a data gap, and transmits each packet data in real time. In addition to being temporarily stored in the information temporary storage means, each packet data is stored in the non-real-time information temporary storage means by receiving a non-real-time information signal composed of packet data for non-real-time information to be actually transmitted. Temporarily memorize. Then, if the packet data stored in the real-time information temporary storage means is not the dummy packet data by the control means, the real-time information temporary storage means and the non-real-time information temporary storage means are used so as to output the packet data. When the switching means for selectively outputting each packet data stored in the storage means is controlled, and the packet data stored in the real-time information temporary storage means is the dummy packet data, the said The switching means is controlled so as to output the packet data stored in the non-real-time information temporary storage means instead of the packet data.

【0010】

Further, the receiving device determines, by the control means, whether each packet data in the received information signal constitutes real-time information or non-real-time information, and configures real-time information. If the packet data is to be processed, the switching means is controlled so that the packet data is supplied to the real-time information temporary storage means, and if the packet data constitutes non-real-time information, the packet data is not stored. The switching means is controlled so as to supply the real-time information temporary storage means. Therefore, in digital broadcasting, real-time information and non-real-time information can be transmitted without conflict.

【0011】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1A is a diagram showing a configuration of a transmission / reception system for digital broadcasting according to an embodiment of the present invention, which is composed of a transmission device 10 and a reception device 20.

【0012】

A real-time information signal 30 such as a moving image or an announcement voice and a non-real-time information signal 40 such as a still image or a sentence are input to the transmission device 10. Then, the real-time information signal 30 and the non-real-time information signal 40 are transmitted in the form of a time-division multiplex information signal 50 that is time-multiplexed.

【0013】

The receiving device 20 receives the time-division multiplex information signal 50 transmitted from the transmitting device 10 and separately outputs the real-time information signal 60 and the non-real-time information signal 70.

【0014】

FIG. 1B shows data in which the real-time information signal 30, the non-real-time information signal 40, the time-divided multiplex information signal 50, the real-time information signal 60, and the non-real-time information signal 70 all have the same bit rate. The content and timing relationship of each information signal in the case of is shown.

【0015】

The real-time information signal 30 is a moving image packet data V with a predetermined compression._n (Here, n = 1,2,3, ... The same applies hereinafter.) Announcement voice packet data A with predetermined compression_n , And dummy packet data N as a data gap. Further, the non-real-time information signal 40 is a still image sentence packet data D to which a predetermined compression is applied._n It is composed of. In the figure, dummy packet data N is also included, but this is shown to illustrate the relationship with the timing of other signals, and in reality, dummy packet data N is also included. There is no.

【0016】

The time-division multiplexing information signal 50 is a multiplexed output of the real-time information signal 30 and the non-real-time information signal 40, and the non-real-time information signal 40 is multiplexed in the gap of the real-time information signal 30.

【0017】

The real-time information signal 60 outputs all the data of the real-time information signal 30 with a fixed delay. Further, the non-real-time information signal 70 has a different delay in each data from the non-real-time information signal 40, and the timings of the data are different from each other. That is, for the data that has passed through the transmitting device 10 and the receiving device 20, the data arrives at a fixed delay with respect to the real-time information, but each packet data V_n , A_n The timing of each other is maintained. For non-real time information, timing is not so important, so each packet data D_n It doesn't matter if the timings are off.

【0018】

Therefore, in this way, by preferentially transmitting important real-time information of transmission timing and transmitting non-real-time information of less important transmission timing in the gap of real-time information, it can be regarded as real-time information in digital broadcasting. Transmission is possible without conflict with non-real-time information.

【0019】

The transmitting device 10 can be configured as shown in FIG. 2, for example, and the receiving device 20 can be configured as shown in FIG. 3, for example. That is, the transmission device 10 temporarily holds a plurality of buffers 11 for temporarily holding real-time information given by an encoder (not shown).₁ ,11₂ ,...11_n-1 ,11_n A plurality of buffers 12 for temporarily holding the non-real-time information given by the non-real-time information generator (not shown), and these buffers 11₁ ~11_n A data switching circuit 13 for switching and outputting the data held in the data 12 to a transmission unit (not shown) and a data detection switching instruction circuit 14 for controlling the data switching circuit 13 are included.

【0020】

Where buffer 11₁ ~11_n Each packet data is sequentially supplied and held in the data detection switching instruction circuit 14, and these buffers 11 are used.₁ ~11_n By referring to the header part of each packet data held in, it is detected whether the packet data is the moving image packet data, the announcement voice packet data, or the dummy packet data, and the moving image packet data or the announcement is made. If it is voice packet data, the buffer 11₁ ~11_n A data switching control signal is supplied to the data switching circuit 13 so as to output the packet data held in the data switching circuit 13. Then, in the case of dummy packet data N, a data switching control signal is supplied to the data switching circuit 13 so as to output the still image sentence packet data held in the buffer 12. As a result, the time division multiplexing information signal 50 as shown in FIG. 1 (B) is output from the data switching circuit 13.

【0021】

Further, the receiving device 20 is the buffer 21 like the transmitting device 10.₁ ~21_nAnd 22, a data switching circuit 23, and a data detection switching instruction circuit 24.

【0022】

That is, by referring to the header portion of each packet data included in the time-division multiplex information signal 50 received by the receiving unit (not shown), the data detection switching instruction circuit 24 uses the packet data as moving image packet data and announcement voice packet. It detects whether it is data or still image text packet data, and if it is moving image packet data or announcement voice packet data, the packet data is buffered 21.₁ ~21_n A data switching control signal is supplied to the data switching circuit 23 so that the data is sequentially output to any of the above. Then, in the case of still image text packet data, a data switching control signal is supplied to the data switching circuit 23 so that the still image text packet data is output to the buffer 22. This results in buffer 21₁ ~21_n The real-time information signal 60 held in and sequentially output from them, and the non-real-time information signal 70 held in the buffer 22 and output are as shown in FIG. 1 (B).

【0023】

Although the present invention has been described above based on one embodiment, the present invention is not limited to the one embodiment described above, and various modifications and applications are possible within the scope of the gist of the present invention. Of course.

【0024】

[Effect of the invention]

As described in detail above, according to the present invention, it is possible to provide a transmission / reception system, a transmission device, and a reception device for digital broadcasting capable of transmitting real-time information and non-real-time information without conflict in digital broadcasting. it can.

[Simple explanation of drawings]

[Figure 1]

(A) is a diagram showing a configuration of a transmission / reception system for digital broadcasting according to an embodiment of the present invention, and (B) is a content of each information signal when all of the information signals are data of the same bit rate. It is a figure which shows the timing relationship.

[Figure 2]

It is a figure which shows the structure of the transmission device in (A) of FIG.

[Fig. 3]

It is a figure which shows the structure of the receiving apparatus in (A) of FIG.

[Explanation of symbols]

10 Transmitter 11₁ ~11_n ,12,21₁ ~21_n , 22 buffer 13,23 Data switching circuit 14,24 Data detection switching instruction circuit 20 Receiver 30,60 Real-time information signal 40,70 Non-real time information signal 50 Time Division Multiplexed Information Signal