JP6765246B2 - Transmitter and program - Google Patents

Description

The present invention relates to a transmitting device, a receiving device, a broadcasting system and a program.

Generally, the TS (Transport Stream) signal constituting the TV program is transmitted at an arbitrary bit rate, but when the transmission of the TS signal is backed up by an IP (Internet Protocol) network or the like, the transmission of the TS signal is backed up. A transmission band of an arbitrary bit rate or higher is required to perform packet conversion processing, error correction coding processing, and the like for the TS signal.

However, when a best effort line (for example, a public network) is used as an IP network, it is often difficult to secure a stable transmission band because the throughput fluctuates, and the best effort line is stabilized. There was a problem that it was difficult to use it as a backup line.

In order to solve such a problem, a technique for suppressing a bit rate in an IP network or the like is known (see, for example, Patent Document 1). Specifically, the transmitting device deletes the null packet contained in the TS signal and transmits it via the IP network, and the receiving device adds the null packet to the TS at an arbitrary bit rate. Techniques for demodulating signals are known.

Japanese Unexamined Patent Publication No. 2008-236399

However, in the above-mentioned technique, the capacity that can compress the TS signal transmitted by the transmitting device is limited to a part, and it is not possible to properly back up the transmission of the TS signal using the best effort line. There was a problem.

Therefore, the present invention has been made to solve the above-mentioned problems, and provides a transmitting device, a receiving device, a broadcasting system, and a program capable of appropriately backing up the transmission of TS signals using a best effort line. The purpose is to provide.

The first feature of the present invention is a transmission device, which is configured to perform re-encoding processing at a predetermined rate only for video packets and voice packets of the main channel included in the TS signal. A new TS signal is generated by remultiplexing the re-encoded video packet and voice packet with a packet other than the video packet and voice packet included in the TS signal. It is a gist to include a configured remultiplexing unit and a conversion unit configured to packetize the new TS signal.

The second feature of the present invention is a receiving device configured to receive a packet transmitted via a line by a transmitting device, and is configured to acquire a TS signal at a predetermined rate from the packet. It is a gist to include a conversion unit that is configured and a control unit that is configured to calculate the throughput of the line in order to calculate the predetermined rate in the transmission device and transmit it to the transmission device. And.

A third feature of the present invention is a broadcasting system including a transmitting device and a receiving device, wherein the transmitting device is used at a predetermined rate only for video packets and voice packets of the main channel included in the TS signal. The re-encoding unit configured to perform the re-encoding process, the re-encoded video packet and the audio packet, and the packet other than the video packet and the audio packet included in the TS signal are re-encoded. The receiving device includes a remultiplexing unit configured to generate a new TS signal by multiplexing and a conversion unit configured to packetize the new TS signal. It is a gist to include a conversion unit configured to acquire the TS signal of the predetermined rate from the packet.

A fourth feature of the present invention is that it is a program for causing a computer to function as the above-mentioned transmission device.

A fifth feature of the present invention is a program for making a computer function as the above-mentioned receiving device.

According to the present invention, it is possible to provide a transmitting device, a receiving device, a broadcasting system and a program capable of appropriately backing up the transmission of a TS signal using a best effort line.

FIG. 1 is an example of a configuration diagram of the broadcasting system 1 according to the first embodiment. FIG. 2 is an example of a functional block diagram of the re-encoding unit of the transmission device 10 according to the first embodiment. FIG. 3 is an example of a packet constituting a TS signal inside the transmission device 10 according to the first embodiment. FIG. 4 is an example of a flowchart showing the operation of the transmission device 10 according to the first embodiment. FIG. 5 is an example of a flowchart showing the operation of the receiving device 30 according to the first embodiment. FIG. 6 is an example of packets constituting the TS signal inside the transmission device 10 according to the modification example 1.

(First Embodiment)
Hereinafter, the broadcasting system 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5.

As shown in FIG. 1, the broadcasting system 1 according to the present embodiment includes a transmitting device 10 and a receiving device 30. Here, in the broadcasting system 1 according to the present embodiment, the transmitting device 10 may be configured to transmit a TS signal to the receiving device 30 by using an IP network as a backup line.

As shown in FIG. 1, the transmission device 10 according to the present embodiment includes a synchronization detection unit 11, a distribution unit 12, a re-encoding unit 13, a delay unit 14, a re-multiplexing unit 15, and a control unit 16. It is provided with a conversion unit 17.

The synchronization detection unit 11 is configured to generate a stable TS signal from the input signal based on the input reference signal (10 MHz and 1 PPS (Pulse Per Second)). Here, the input signal may be a TS3 signal (TS signal, Clock and Fsync signal), or may be only a TS signal.

The distribution unit 12 is configured to distribute the TS signal from the synchronization detection unit 11 to the delay unit 14 (route A) and the re-encoding unit 13 (route B).

The re-encoding unit 13 is configured to perform re-encoding processing at a predetermined rate only on the video packets and audio packets of the main channel designated in advance.

For example, as shown in FIG. 2A, the re-encoding unit 13 may be composed of a decoding unit 13A, a descrambler unit 13B, and a scrambler unit 13C. In such a case, the TS signal distributed by the distribution unit 12 is decoded into an HD-SDI signal or the like by the decoding unit 13A and the descrambler unit 13B, and then re-encoded by the encoder unit 13C. There is.

Alternatively, as shown in FIG. 2B, the re-encoding unit 13 may be configured by the transcoder 13D.

Specifically, as shown in FIG. 3, the re-encoding unit 13 is a main channel (“DG main” in FIG. 3) in the TS signal (“signal A” in FIG. 3) distributed by the distribution unit 12. By re-encoding only the video packet and the audio packet (“video”, “audio 1” and “audio 2” in FIG. 3) at a predetermined rate, only the video packet and the audio packet (“video” and “audio 2” in FIG. 3) are re-encoded. It is configured to generate a TS signal (“signal B” in FIG. 3) composed of “voice 1” and “voice 2”).

Here, the PIDs (Packet ID, packet identification information) of the video packet and the audio packet of the main channel may be configured to be the same before and after the re-encoding process is performed.

Specifically, as shown in FIG. 3, the PID of the video packet (“video” in FIG. 3) in the signal A before the re-encoding process and the video in the signal B after the re-encoding process are performed. The PIDs of the packets (“video” in FIG. 3) are both “0x0110”.

Further, as shown in FIG. 3, the PID of the voice packet (“voice 1” in FIG. 3) in the signal A before the re-encoding process and the voice packet (voice 1) in the signal B after the re-encoding process are performed. The PIDs of "voice 1") in FIG. 3 are both "0x0110".

Further, as shown in FIG. 3, the PID of the voice packet (“voice 2” in FIG. 3) in the signal A before the re-encoding process and the voice packet (voice 2) in the signal B after the re-encoding process are performed. The PIDs of "voice 2") in FIG. 3 are both "0x0111".

According to such a configuration, the remultiplexing unit 15 can easily recognize the video packet and the audio packet transmitted via the route A and the video packet and the audio packet transmitted via the route B. it can.

The delay unit 14 transmits packets other than the above-mentioned main channel video packet and audio packet (that is, packets included in the signal A) based on the time required for the re-encoding process (that is, the processing time by the re-encoding unit 13). It is configured to be delayed and then transmitted to the remultiplexing unit 15.

For example, the delay unit 14 includes packets other than the above-mentioned main channel video packet and audio packet (that is, signal A) for a time corresponding to the time required for the re-encoding process (that is, the processing time by the re-encoding unit 13). The packet) is delayed and then transmitted to the remultiplexing unit 15.

According to such a configuration, the remultiplexing unit 15 can accurately remultiplex the signal A transmitted via the route A and the signal B transmitted via the route B.

The re-multiplexing unit 15 is configured to generate a new TS signal by re-multiplexing the re-encoded video packet and audio packet and the packet other than the video packet and the audio packet included in the TS signal. Has been done.

Specifically, as shown in FIG. 3, the remultiplexing unit 15 includes the signal B (including the “video”, “audio 1”, and “audio 2” in FIG. 3) and the delay unit received from the re-encoding unit 13. By remultiplexing the signal A received from 14, that is, the "video", "audio 1", and "audio 2" of the signal A received from the delay unit 14 are converted into the signal B received from the re-encoding unit 13. It is configured to generate a new TS signal, signal C, by replacing it with the included "video", "audio 1", and "audio 2".

As shown in FIG. 3, the re-multiplexing unit 15 is configured to increase the amount of null packets corresponding to the reduction of video packets and audio packets by performing the re-encoding process. ..

The control unit 16 is configured to control the re-encoding unit 13, the delay unit 14, the re-multiplexing unit 15, and the conversion unit 17.

For example, the control unit 16 is configured to determine the above-mentioned predetermined rate and notify the re-encoding unit 13. Here, the control unit 16 may be configured to change the predetermined rate according to the throughput of the line for transmitting the packetized TS signal (IP line network in this embodiment). ..

According to such a configuration, it is possible to reduce the transmission error of the TS signal transmitted from the transmitting device 10 to the receiving device 30.

The conversion unit 17 is configured to delete a null packet from the new TS signal from the remultiplexing unit 15, then packetize it and transmit it to the IP address specified by the receiving device 30 by UDP or the like.

When the re-encoding unit 13 determines that the line for transmitting the packetized TS signal (IP line network in this embodiment) is stable (that is, the throughput of the line has a margin). In some cases), the above-mentioned main channel video packet and voice packet may be configured not to be re-encoded.

For example, when the throughput of the line exceeds a predetermined threshold value, the re-encoding unit 13 applies the through mode operation and does not perform the re-encoding process on the above-mentioned main channel video packet and audio packet. It may be configured in.

When such a through mode is applied, the delay unit 14 does not delay packets other than the above-mentioned main channel video packet and audio packet (that is, packets included in the signal A), and the remultiplexing unit 15 delays. It is configured to output the signal A from the unit 14 as it is.

According to such a configuration, a high-quality and low-delay TS signal can be transmitted from the transmitting device 10 to the receiving device 30.

Further, as shown in FIG. 1, the receiving device 30 according to the present embodiment includes a conversion unit 31, a synchronization unit 32, and a control unit 33.

The conversion unit 31 is configured to acquire a TS signal at a predetermined rate from a packet transmitted via the IP network by the transmission device 10. Specifically, the conversion unit 31 is configured to convert a packet having a predetermined IP address into a TS signal, add a null packet, and generate a TS signal at a predetermined rate.

The synchronization unit 32 is configured to reproduce the TS signal (or TS3 signal) input to the transmission device 10 with reference to the input reference signal (10 MHz and 1PPS), the Fbit of the TS signal, and the like. ..

The control unit 33 is configured to control the conversion unit 31. For example, the control unit 33 is configured to specify the above-mentioned IP address to the conversion unit 31.

Further, the control unit 33 calculates the throughput of the line (in this embodiment, the IP line network) in order to calculate the predetermined rate in the control unit 16 of the transmission device 10, and transmits the transmission unit (shown) to the transmission device 10. It may be configured to transmit via.

FIG. 4 shows a flowchart for explaining an example of the operation of the transmission device 10 according to the present embodiment.

As shown in FIG. 4, in step S101, the transmission device 10 performs synchronous detection based on the input reference signal, and generates a stable TS signal from the input signal.

In step S102, the transmission device 10 distributes the TS signal to the delay unit 14 (route A) and the re-encoding unit 13 (route B).

In step S103, the transmitting device 10 delays the packet included in the signal A at the signal A on the route A based on the time required for the re-encoding process.

In step S104, the transmission device 10 re-encodes only the video packet and the audio packet of the main channel designated in advance at the predetermined rate in the signal B on the route B.

In step S105, the transmission device 10 performs a new TS by performing remultiplexing processing using the re-encoded video packet and voice packet and the packet other than the video packet and the voice packet included in the TS signal. Generate a signal.

In step S106, the transmission device 10 performs conversion processing on the new TS signal that has undergone remultiplexing processing, that is, deletes a null packet from the new TS signal that has undergone remultiplexing processing, and then packets. Then, in step S107, the packet is transmitted to the IP address specified by the receiving device 30 in UDP or the like.

FIG. 5 shows a flowchart for explaining an example of the operation of the receiving device 30 according to the present embodiment.

As shown in FIG. 5, in step S201, the receiving device 30 converts the packet of the predetermined IP address into the TS signal (that is, after performing the conversion process), adds a null packet, and TS at the predetermined rate. Generate a signal.

In step S202, the receiving device 30 reproduces the TS signal (or TS3 signal) input to the transmitting device 10 with reference to the input reference signal, the Fbit of the TS signal, and the like.

According to the broadcasting system 1 according to the present embodiment, it is possible to appropriately back up the transmission of the TS signal by using the best effort line (for example, the IP line network).

(Change example 1)
Hereinafter, the broadcasting system 1 according to the modified example 1 will be described with reference to FIG. 6, focusing on the differences from the broadcasting system 1 according to the first embodiment described above.

As shown in FIG. 6, in the broadcasting system 1 according to this modification, when the signal A includes a subchannel (“DG sub1” in FIG. 3), the remultiplexing unit 15 deletes the subchannel. It may be configured to do so.

According to such a configuration, the amount of data in the backup of the transmission of the TS signal can be reduced.

(Other embodiments)
As mentioned above, the invention has been described by the embodiments described above, but the statements and drawings that form part of the disclosure in such embodiments should not be understood as limiting the invention. Such disclosure will reveal to those skilled in the art various alternative embodiments, examples and operational techniques.

Further, although not particularly mentioned in the above-described embodiment, a program that causes a computer to execute each process performed by the above-mentioned transmitting device 10 and receiving device 30 may be provided. The program may also be recorded on a computer-readable medium. Computer-readable media can be used to install such programs on computers. Here, the computer-readable medium on which such a program is recorded may be a non-transient recording medium. The non-transient recording medium is not particularly limited, but may be, for example, a recording medium such as a CD-ROM or a DVD-ROM.

Alternatively, a chip composed of a memory for storing a program for realizing at least a part of the functions in the transmission device 10 and the reception device 30 described above and a processor for executing the program stored in the memory may be provided. ..

1 ... Broadcast system 10 ... Transmission device 11 ... Synchronous detection unit 12 ... Distribution unit 13 ... Re-encoding unit 14 ... Delay unit 15 ... Re-multiplexing unit 16 ... Control unit 17 ... Conversion unit 30 ... Reception device 31 ... Conversion unit 32 ... Synchronization Unit 33 ... Control unit

Claims (5)

A re-encoding unit that performs re-encoding processing at a predetermined rate only for the video packets and audio packets of the main channel included in the TS signal.
A delay unit that delays the packet included in the TS signal and outputs it based on the time required for the re-encoding process.
A re-multiplexing unit that generates a new TS signal by re-multiplexing the video packet and audio packet output by the re-encoding process and the packet output by the delay unit.
It is provided with a conversion unit that packetizes the new TS signal.
The re-encoding unit sets the PIDs of the video packet and the audio packet of the main channel to be the same before and after the re-encoding process.
The remultiplexing unit is a transmission device that replaces the video packet and the audio packet output by the delay unit with the video packet and the audio packet output by the re-encoding process based on the PID. It is information indicating the throughput of the line for transmitting the packetized TS signal, and is characterized by including a control unit that changes the predetermined rate according to the throughput information transmitted from the receiving side. The transmitter according to claim 1. When it is determined that the line for transmitting the packetized TS signal is stable, the re-encoding unit performs the re-encoding process on the video packet and the voice packet of the main channel. Claim 1 or 2 is characterized in that the delay unit does not delay the packet included in the TS signal, and the remultiplexing unit outputs the packet output by the delay unit as it is. The transmitter described in. The TS signal includes a packet of the main channel and a packet of a mobile phone channel different from the main channel.
The re-encoding unit is characterized in that the video packet and the audio packet of the mobile phone channel are not re-encoded, but the video packet and the audio packet of the main channel are re-encoded. The transmitter according to any one of claims 1 to 3. A program for causing a computer to function as a transmitter according to any one of claims 1 to 4.

Images