WO2014010002A1

WO2014010002A1 - Broadcasting system, transmission device for broadcasting, and reception device for broadcasting

Info

Publication number: WO2014010002A1
Application number: PCT/JP2012/004527
Authority: WO
Inventors: 中西　徹
Original assignee: パナソニック株式会社
Priority date: 2012-07-12
Filing date: 2012-07-12
Publication date: 2014-01-16

Abstract

The invention provides a transmission system whereby the processing load in a reception device can be reduced. This broadcasting system comprises a transmission device and a reception device. The transmission device comprises a data multiplexing section, a stream multiplexing section and a transmission section. The data multiplexing section generates a transmission stream by multiplexing broadcasting data corresponding to a plurality of respective broadcast signals. The stream multiplexing section generates a multiplex broadcast stream by multiplexing a plurality of broadcast streams. The transmission section transmits the multiplex stream to the reception device. At the reception device, the reception section for the reception device receives the multiplexed transmission stream from the transmission device. A multiplexed stream demultiplexing section restores the plurality of broadcast streams by demultiplexing the multiplexing of the multiplexed broadcast stream. An output section outputs a plurality of broadcast streams.

Description

Broadcast system, broadcast transmitter, and broadcast receiver

This disclosure relates to a broadcasting system. In addition, the present invention relates to a broadcast transmission apparatus or a broadcast reception apparatus constituting the broadcast system.

In the prior art, a broadcasting system for simultaneously recording a plurality of broadcast channels (programs) with one tuner has been proposed (see cited document 1). In this type of broadcasting system, first, when a transmission device that provides a program broadcast receives broadcast waves of a plurality of broadcast channels, a multiplexer process is performed on the plurality of broadcast waves, and one broadcast including a plurality of program data is transmitted. A stream (broadcast stream for broadcasting) is generated. Then, the transmission device transmits this broadcast stream to the reception device. Next, the receiving device that receives the program broadcast performs demultiplexer processing on the broadcast stream. Thereby, each program data included in the broadcast stream is recognized. Then, a broadcast stream for the program is generated so that each program data is included in one broadcast stream. Then, the receiving device records the broadcast stream for the program on the recording device.

JP 2009-512352 A

A conventional receiving apparatus performs demultiplexer processing to recognize each program data and generate a broadcast stream (transport stream) for the program. Specifically, the conventional receiving apparatus performs processing for identifying each of a plurality of program data included in a broadcast stream for broadcasting and one broadcast stream including one program data (program broadcast stream; transport Stream) must be executed. As described above, in the conventional receiving apparatus, the process for identifying each program data and the process for generating the broadcast stream for the program must be executed, which may increase the processing load on the receiving apparatus. there were.

The present disclosure has been made in view of the above-described problems, and provides a broadcasting system that can reduce the processing load on a receiving apparatus.

The broadcast system disclosed here is composed of a transmission device and a reception device. The transmission device transmits broadcast streams corresponding to broadcast waves of a plurality of broadcast channels. The receiving device receives the broadcast stream from the transmitting device.
The transmission device includes a data multiplexing unit, a stream multiplexing unit, and a transmission unit. The data multiplexing unit multiplexes broadcast data corresponding to each of a plurality of broadcast waves, and generates a plurality of broadcast streams. The stream multiplexing unit multiplexes a plurality of broadcast streams to generate a multiplexed broadcast stream. The transmission unit transmits the multiplex broadcast stream to the reception device.

The receiving device includes a receiving unit for the receiving device, a multiple stream canceling unit, a recording unit, and an output unit. The receiving unit for the receiving device receives the multiplex broadcast stream from the transmitting device. The multiplex stream release unit demultiplexes the multiplex broadcast stream and restores a plurality of broadcast streams. The recording unit records a plurality of broadcast streams or multiple broadcast streams that have been restored by the multiple stream canceling unit. The output unit outputs a plurality of broadcast streams.

In the present disclosure, a broadcasting system capable of reducing the processing load in the receiving device is provided.

1 is an overall configuration diagram of a broadcasting system according to an embodiment. The block diagram of the content delivery apparatus in the broadcasting system which concerns on this embodiment. The block diagram of the user apparatus in the broadcast system which concerns on this embodiment. The flowchart which shows operation | movement of the content delivery apparatus and operation | movement of a user apparatus in the broadcast system which concerns on this embodiment. The block diagram of the user apparatus in the broadcast system which concerns on other embodiment.

Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.
The inventor provides the accompanying drawings and the following description in order for those skilled in the art to fully understand the present disclosure, and is not intended to limit the subject matter described in the claims. Absent.

[Broadcast system overview]
As shown in FIG. 1, the present broadcast system mainly includes a content distribution device 1 (an example of a transmission device) and a user device 50 (an example of a reception device). The content distribution apparatus 1 receives broadcast waves of a plurality of broadcast channels and transmits a broadcast stream corresponding to the broadcast waves. The content distribution apparatus 1 may transmit a unique broadcast stream in addition to the received broadcast wave. In addition, the user device 50 receives this broadcast stream from the content distribution device 1. The communication between the content distribution device 1 and the user device 50 may be wired or wireless.

<Content distribution apparatus 1>
The content distribution apparatus 1 is an example assuming a rebroadcast headend of a cable television, but can also be realized by a cable television independent broadcast apparatus, a satellite television distribution apparatus, a television broadcast apparatus, an on-demand server, and the like.
As shown in FIG. 2, the content distribution device 1 includes a plurality of tuners 10 (an example of a receiving unit for a transmission device), a plurality of descramblers 11 (an example of a first authentication unit), and a plurality of transcoders 12 ( An example of a broadcast data changing unit), a plurality of data multiplexers 13 (an example of data multiplexing units), a stream multiplexer 14 (an example of a stream multiplexing unit), a transmission unit 15, and a first controller 20. And has.

As shown in FIGS. 1 and 2, the content distribution apparatus 1 may include an encoder 16. In FIG. 1 and FIG. 2, there is only one encoder 16, but a plurality of encoders may be provided.
The tuner 10 receives a broadcast wave of a broadcast channel. One tuner 10 is prepared for each broadcast channel. That is, in the content distribution apparatus 1, a plurality of tuners 10 are used.

The descrambler 11 cancels the scramble of the broadcast data included in the broadcast wave. One descrambler 11 is prepared for each broadcast channel. For example, the descrambler 11 cancels the scramble of the broadcast data included in the broadcast wave based on the program authentication information. Thus, by releasing the scramble of the broadcast data, the broadcast data can be read. Broadcast data is formed in, for example, MPEG-2 format.

Note that data included in broadcast waves, for example, broadcast waves, includes EMM (Entitlement Management Message), ECM (Entitlement Control Message), and the like. Further, the authentication information includes, for example, an ID number and a master key. More specifically, authentication information such as an ID number and a master key is included in a program authentication card. When the program authentication card is inserted into the descrambler 11, the authentication information is recognized by the first controller 20.

The transcoder 12 transcodes broadcast data corresponding to the broadcast wave. One transcoder 12 is prepared for each broadcast channel. For example, the transcoder 12 converts broadcast data from MPEG-2 format to H.264. Transcode to H.264 format. The transcoder 12 sets the bit rate of the broadcast data to a predetermined value according to the content of the broadcast wave.

The encoder 16 encodes at least one of video data and audio data, and creates unique broadcast data different from the received broadcast wave.
The data multiplexer 13 generates broadcast streams, for example, transport streams TS_1 to TS_n, by multiplexing the broadcast data. One multiplexer 13 for data is prepared for each broadcast channel. That is, a plurality of transport streams TS_1 to TS_n are generated by a plurality of data multiplexers 13.

The stream multiplexer 14 multiplexes a plurality of transport streams TS_1 to TS_n (a plurality of broadcast streams) to generate a transport stream group TSG (a multiplex broadcast stream). The transport stream group TSG is composed of a plurality of transport streams TS_1 to TS_n. A transport stream group TSG in which a plurality of transport streams TS_1 to TS_n are multiplexed is included in one physical channel PYC.

The stream multiplexer 14 assigns a common ECM (Entitlement Control Message) to the transport stream TSG. As described above, when the content distribution apparatus 1 receives a plurality of broadcast waves, it has been necessary to individually scramble each of the plurality of broadcast waves. However, by using a common ECM, as described later, The user apparatus 50 can read the transport streams TS_1 to TS_n, the transport stream group TSG, and the like with only one descrambling.

The transmission unit 15 transmits the transport stream group TSG to the user device 50. Accordingly, the transport stream group TSG (a plurality of transport streams TS_1 to TS_n) is transmitted from the content distribution apparatus 1 to the user apparatus 50 in a state where it is included in one physical channel PYC.
The first controller 20 is provided mainly for controlling the above processing. The first controller 20 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The CPU interprets instructions from the control program and performs various data processing and control. The RAM is used, for example, to temporarily store various data from the hard disk or to temporarily record the processing results from the first controller 20. That is, the RAM is used as a buffer. The ROM stores, for example, system program data and basic data.

<User device 50>
The user device 50 is realized by, for example, a set top box (STB), a television, a personal computer with a television card, or the like.
As shown in FIG. 3, the user device 50 mainly includes a tuner 60 (an example of a receiving unit for a receiving device), a descrambler 61 (an example of a second authentication unit), and a stream demultiplexer 62. (An example of a multiple stream cancellation unit), a recording unit 63, a selection unit 64, an output unit 65 (an example of a decoder), and a second controller 70 are provided.

The tuner 60 receives the transport stream group TSG transmitted from the content distribution device 1. There is one tuner 60 used in the user device 50.
The descrambler 61 releases the scramble of the transport stream group TSG. For example, the descrambler 61 releases the scramble of the transport stream group TSG based on the viewer authentication information. Here, the viewer authentication information includes one ECM (common ECM). With this common ECM, the scramble of the transport stream group TSG is released. In this way, the transport stream group TSG can be read by releasing the scrambling of the data.

The stream demultiplexer 62 demultiplexes the transport stream group TSG and restores the plurality of transport streams TS_1 to TS_n. The stream demultiplexer 62 demultiplexes the transport stream group TSG, and does not demultiplex the transport streams TS_1 to TS_n. In other words, the stream demultiplexer 62 only performs a process for solving the transport stream group TSG in which the transport streams TS_1 to TS_n are bundled.

The recording unit 63 can record the transport streams TS_1 to TS_n. The recording unit 63 is composed of, for example, a hard disk. The recording unit 63 has a first recording area for recording a plurality of transport streams TS_1 to TS_n and a second recording area for recording other data. For example, in the first recording area, a plurality of transport streams TS_1 to TS_n returned by the stream demultiplexer 62 are individually recorded. More specifically, in the first recording area, transport streams TS_1 to TS_n of each broadcast channel are accumulated in chronological order from the top of the first recording area.

The selection unit 64 selects output data. The selection unit 64 corresponds to an operation unit in the user device 50, for example. The selection unit 64 may be an operation unit provided in the user device 50 or may be a wireless operation unit that operates the user device 50 from the outside. For example, when a broadcast channel desired by the user is selected via the selection unit 64, transport streams TS_1 to TS_n corresponding to the broadcast channel are selected by the recording unit 63 and read from the recording unit 63. When the transport stream group TSG is recorded in the recording unit 63, the transport stream group TSG is selected by the recording unit 63 and read from the recording unit 63.

The output unit 65 outputs at least one of the plurality of transport streams TS_1 to TS_n. For example, the output unit 65 outputs the transport streams TS_1 to TS_n selected by the selection unit 64 to the external device 100, for example, a monitor. More specifically, the output unit 65 includes a decoder. The output unit 65 decodes each of the transport streams TS_1 to TS_n and outputs the video signal and the audio signal to the external device 100, for example, a monitor.

The second controller 70 is provided mainly for controlling the above processing. The second controller 70 has, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The CPU interprets instructions from the control program and performs various data processing and control. The RAM is used, for example, for temporarily storing various data from the hard disk or temporarily recording the processing result from the second controller 70. That is, the RAM is used as a buffer. The ROM stores, for example, system program data and basic data.

[Broadcast system process processing]
Hereinafter, the operations of the content distribution device 1 and the user device 50 in the broadcast system will be described using the flowchart shown in FIG. The operation of the content distribution apparatus 1 shown below is controlled and processed by the first controller 20. The operation of the user device 50 is controlled and processed by the second controller 70.

First, when broadcast waves of a plurality of broadcast channels reach the content distribution apparatus 1, each of the plurality of tuners 10 individually receives each broadcast wave (S1). Next, the scramble of the broadcast data included in each broadcast wave is released by the descrambler 11 based on the program authentication card information (S2). Thereby, the broadcast data corresponding to the broadcast channel received by each tuner 10 can be read.

Specifically, the EMM included in the broadcast wave is decrypted by the master key included in the card information for program authentication, and the individual information contained in the EMM, the key for ECM decryption, and the like are extracted. Then, the ECM included in the broadcast wave is decoded by the ECM decoding key, and a key (program scramble release key) for enabling viewing of the broadcast channel is taken out. Then, the scramble of the broadcast data is released using the program scramble release key.

Subsequently, each of the plurality of broadcast data is transcoded by each transcoder 12 (S3). Here, for example, each broadcast data is converted from MPEG-2 format to H.264. Transcoded to H.264 format. Here, each broadcast data is set to a predetermined bit rate according to the content of the broadcast wave.
For example, when the moving speed of the display target in the broadcast channel (program) is slow, the transcoder 12 sets the bit rate of the broadcast data to a predetermined bit rate that is smaller than the reference bit rate. Programs corresponding to this case include anime programs and the like. On the other hand, when the moving speed of the display target in the broadcast channel (program) is fast, the transcoder 12 sets the bit rate of the broadcast data to a predetermined bit rate that is higher than the reference bit rate. Programs corresponding to this case include sports programs and the like.

The reference bit rate and the predetermined bit rate are set by the first controller 20. Specifically, the CPU of the first controller 20 reads a reference bit rate and a predetermined bit rate from the ROM and sets them.
Subsequently, the transcoded broadcast data is multiplexed by the data multiplexer 13, and transport streams TS_1 to TS_n (an example of a broadcast stream) are generated (S4). These transport streams TS_1 to TS_n may include transport streams obtained by encoding and multiplexing unique video data and audio data, as shown in FIGS. Here, one transport stream TS_1 to TS_n is generated for each of a plurality of broadcast data. That is, here, a plurality of transport streams TS_1 to TS_n are generated.

Each transport stream TS_1 to TS_n includes program arrangement information (SI; Service Information), a main program element stream packet, a sub program element stream packet, a PCR (Program Clock Reference) stream packet, and the like. .
Program sequence information (SI; Service Information) includes PSI (Program Specific Information). The PSI includes program specifying information such as PAT and PMT. The main program element stream packet is a stream packet corresponding to video or audio in each program. The sub program arrangement information (SI; Service Information) is a stream packet corresponding to a caption, a character superimposition, and the like in each program. The PCR stream packet is a stream packet that defines a time stamp that defines the decoding timing.

For example, in FIG. 2 and FIG. 3, the program arrangement information is indicated by the symbol “SI”, and the main program element stream packet is indicated by “Video” and “Audio”. Further, the program element stream packet and the PCR stream packet are not shown.
Subsequently, the plurality of transport streams TS_1 to TS_n are multiplexed by the stream multiplexer 14, and a transport stream group TSG (an example of a multiplexed broadcast stream) is generated (S5). When the transport stream group TSG is generated, a common ECM (common ECM) is assigned to the transport stream group TSG (S6).

Then, the transport stream group TSG to which the common ECM is assigned is transmitted from the content distribution device 1 to the user device 50 via the transmission unit 15. Specifically, the transport stream group TSG is transmitted from the content distribution device 1 to the user device 50 in a state where the transport stream group TSG is included in one physical channel PYC. 2 and 3 are diagrams showing a state in which the transport stream group TSG (a plurality of transport streams TS_1 to TS_n) is included in parallel in one physical channel PYC.

Next, when the transport stream group TSG reaches the user apparatus 50, the tuner 60 of the user apparatus 50 receives the transport stream group TSG (S11). Then, the scramble of the transport stream group TSG is canceled by the descrambler 61 based on the card information for viewer authentication (S12). As a result, the transport stream group TSG can be read.

Specifically, the common ECM assigned to the transport stream group TSG is decrypted by the key included in the card information for viewer authentication. As a result, a key (program descrambling key) for enabling viewing of the broadcast channel is taken out. Then, the scramble of the transport stream group TSG is released using the descrambling key.

Subsequently, the multiplexing of the transport stream group TSG is canceled by the stream demultiplexer 62, and a plurality of transport streams TS_1 to TS_n are restored (S13). Then, a plurality of transport streams TS_1 to TS_n are individually recorded in the recording unit 63 (S14).
Here, the second controller 70 monitors a broadcast channel output instruction from the user (S15). Therefore, when the user instructs the output of the broadcast channel (Yes in S15), the transport streams TS_1 to TS_n corresponding to the designated broadcast channel are transmitted from the user device 50 via the output unit 65 to the external device 100. For example, it is output to a monitor (S16). More specifically, the transport streams TS_1 to TS_n are decoded by the output unit 65 and output from the user device 50 to the external device 100, for example, a monitor. Thereby, the broadcast channel is displayed on the external device 100, for example, a monitor. On the other hand, when the output of the broadcast channel is not instructed (No in S15), the second controller 60 monitors the user's output instruction.

In step 16 (S16) in FIG. 4, after the broadcast channel is displayed on the external device 100, for example, a monitor, the flowchart is finished. This is only described for the sake of convenience in creating the flowchart, and after the broadcast channel is displayed on the external device 100, the user apparatus 50 is turned off until step 11 is performed. The processing from (S11) to step 16 (S16) is executed in the user device 50.

As described above, in the present technology, since the plurality of transport streams TS_1 to TS_n are individually recorded in the recording unit 63, the transport streams TS_1 to TS_n corresponding to the user output request are directly recorded. It can be read from the unit 63.
In the general prior art, broadcast data corresponding to a broadcast channel is recorded in the recording unit 63. That is, since the broadcast channel is not recorded in the format of the transport streams TS_1 to TS_n in the recording unit 63, when a user output request is generated, the broadcast data of the recording unit 63 corresponding to the broadcast channel is recognized, Also, it is necessary to generate transport streams TS_1 to TS_n corresponding to the broadcast data.

On the other hand, in the present technology, as described above, the user device 50 needs to execute the process of recognizing the broadcast data corresponding to the broadcast channel and generating the transport streams TS_1 to TS_n corresponding to the broadcast data. Therefore, the processing load on the user device 50 can be greatly reduced.
[Summary]
(1) This broadcast system includes a content distribution device 1 and a user device 50. The content distribution apparatus 1 transmits transport streams TS_1 to TS_n corresponding to broadcast waves of a plurality of broadcast channels. The user device 50 receives the transport streams TS_1 to TS_n from the content distribution device 1.

The content distribution apparatus 1 includes a plurality of data multiplexers 13, a stream multiplexer 14, and a transmission unit 15. The data multiplexer 13 multiplexes broadcast data corresponding to each of a plurality of broadcast waves to generate transport streams TS_1 to TS_n. The stream multiplexer 14 multiplexes a plurality of transport streams TS_1 to TS_n to generate a transport stream group TSG. The transmission unit 15 transmits the transport stream group TSG to the user device 50.

The user device 50 includes a tuner 60, a stream demultiplexer 62, a recording unit 63, and an output unit 65. The tuner 60 receives the transport stream group TSG from the content distribution device 1. The stream demultiplexer 62 demultiplexes the transport stream group TSG and restores the plurality of transport streams TS_1 to TS_n. The recording unit 63 individually records a plurality of transport streams TS_1 to TS_n returned by the stream demultiplexer 62. Further, as will be described later, the recording unit 63 may record the transport stream group TSG. The output unit 65 outputs a plurality of transport streams TS_1 to TS_n.

In this broadcast system, the content distribution apparatus 1 first generates transport streams TS_1 to TS_n corresponding to a plurality of broadcast waves, and then transport stream groups TSG corresponding to the plurality of transport streams TS_1 to TS_n. Is generated. Thereby, the user apparatus 50 can output a plurality of transport streams TS_1 to TS_n only by demultiplexing the transport stream group TSG and returning the plurality of transport streams TS_1 to TS_n. That is, in the present broadcasting system, as in the prior art, the user device 50 individually recognizes a plurality of broadcast data, and sets the transport streams TS_1 to TS_n so that one broadcast data is included in one transport stream. There is no need to execute the process to be generated. For this reason, in this broadcast system, the processing load on the user device 50 can be significantly reduced.

(2) In this broadcast system, the user device 50 further includes a recording unit 63. The recording unit 63 individually records a plurality of transport streams TS_1 to TS_n returned by the stream demultiplexer 62. Further, as will be described later, the recording unit 63 may record the transport stream group TSG. In this case, the stream demultiplexer 62 demultiplexes the transport stream group TSG read from the recording unit 63 and restores the plurality of transport streams TS_1 to TS_n.

In this broadcasting system, the recording unit 63 records at least one of the plurality of transport streams TS_1 to TS_n and the transport stream group TSG returned by the stream demultiplexer 62. For example, when the recording unit 63 individually records a plurality of transport streams TS_1 to TS_n, the transport streams TS_1 to TS_n corresponding to the user's output request can be directly read from the recording unit 63. As described above, since it is not necessary to generate the transport streams TS_1 to TS_n so that one broadcast data is included in one transport stream, the processing load on the user apparatus 50 can be greatly reduced.

On the other hand, when the recording unit 63 records the transport stream group TSG, the transport stream group TSG is demultiplexed by the stream demultiplexer 62 in response to a user output request. That is, as long as the transport stream group TSG is demultiplexed, it is not necessary to generate the transport streams TS_1 to TS_n so that one transport data is included in one transport stream. The processing load at 50 can be greatly reduced.

(3) The broadcast system further includes a plurality of transcoders 12. Each transcoder 12 transcodes broadcast data corresponding to each of a plurality of broadcast waves. In this broadcast system, broadcast data corresponding to each of a plurality of broadcast waves is transcoded, so that the band of the physical channel PYC can be used effectively.
(4) In this broadcast system, the transcoder 12 sets the bit rate of the broadcast data according to the content of the broadcast wave. In the present broadcasting system, the bit rate of the broadcast data is set according to the contents of the broadcast wave, so the video resolution can be changed according to the type of broadcast (program). Specifically, when the moving speed of the display target is slow (ex. Animation program or the like), the bit rate of the broadcast data is set to 2.5 Mbps, for example. On the other hand, when the moving speed of the display target is fast (ex. Sports program etc.), the bit rate of the broadcast data is set to 3.0 Mbps, for example. Thus, by making it possible to change the bit rate of broadcast data, video can be displayed without being disturbed in various broadcasts.

(5) In the present broadcast system, the content distribution apparatus 1 further includes an encoder 16. The encoder 16 encodes at least one of video data and audio data. In this case, the multiplexer 13 (an example of a data multiplexing unit) multiplexes broadcast data corresponding to each video data and / or each audio data output from the encoder, and generates a transport stream TS. Thereby, in this broadcast system, even if it is original broadcast data different from a broadcast wave, the processing load in the user apparatus 50 can be reduced significantly.

(6) In the present broadcasting system, the content distribution apparatus 1 further includes a plurality of descramblers 11. Each of the plurality of descramblers 11 performs program authentication for each broadcast wave received by the tuner 10. In addition, the user device 50 further includes a descrambler 61. The descrambler 61 performs program authentication for the transport stream group TSG received by the tuner 60. In the present broadcasting system, since the content distribution apparatus 1 has already performed authentication for a plurality of broadcast waves, the user apparatus 50 can read the transport stream group TSG by only one authentication. For this reason, the processing load in the user apparatus 50 can be reduced.

(7) In this broadcast system, the transport stream group TSG is included in one physical channel PYC. In this broadcasting system, since the transport stream group TSG obtained by multiplexing a plurality of transport streams TS_1 to TS_n is transmitted in one physical channel PYC, the transport stream group TSG is even demultiplexed. In other words, it is not necessary to generate the transport streams TS_1 to TS_n so that one broadcast data is included in one transport stream, so that the processing load on the user apparatus 50 can be greatly reduced.

(8) The content distribution apparatus 1 receives broadcast waves of a plurality of broadcast channels and transmits transport streams TS_1 to TS_n corresponding to the broadcast waves to the user apparatus 50. The content distribution apparatus 1 includes a plurality of tuners 10, a plurality of data multiplexers 13, a stream multiplexer 14, and a transmission unit 15. The plurality of receiving units receive broadcast waves separately. The data multiplexer 13 multiplexes broadcast data corresponding to each of a plurality of broadcast waves to generate transport streams TS_1 to TS_n. The stream multiplexer 14 multiplexes a plurality of transport streams TS_1 to TS_n to generate a transport stream group TSG. The transmission unit 15 transmits the transport stream group TSG to the user device 50.

In the content distribution apparatus 1, first, transport streams TS_1 to TS_n corresponding to a plurality of broadcast waves are generated, and then a transport stream group TSG corresponding to the plurality of transport streams TS_1 to TS_n is generated. . Thereby, the user apparatus 50 can output a plurality of transport streams TS_1 to TS_n only by demultiplexing the transport stream group TSG and returning the plurality of transport streams TS_1 to TS_n. That is, as in the prior art, the user apparatus 50 individually recognizes a plurality of broadcast data and generates a transport stream TS_1 to TS_n so that one broadcast data is included in one transport stream. No need to run. For this reason, the processing load in the user apparatus 50 can be significantly reduced.

(9) The user apparatus 50 receives broadcast waves of a plurality of broadcast channels and receives a plurality of transport streams TS_1 from the content distribution apparatus 1 that multiplexes a plurality of transport streams TS_1 to TS_n corresponding to the plurality of broadcast waves. Transport stream group TSG multiplexed with TS_n is received. The user device 50 includes a tuner 60, a stream demultiplexer 62, and an output unit 65. The receiving unit receives the transport stream group TSG from the content distribution device 1. The stream demultiplexer 62 demultiplexes the transport stream group TSG and restores the plurality of transport streams TS_1 to TS_n. The output unit 65 outputs a plurality of transport streams TS_1 to TS_n.

The user apparatus 50 can output a plurality of transport streams TS_1 to TS_n only by demultiplexing the transport stream group TSG and returning the plurality of transport streams TS_1 to TS_n. That is, as in the prior art, the user device 50 individually recognizes a plurality of broadcast data and generates a transport stream TS_1 to TS_n so that one broadcast data is included in one transport stream. There is no need to execute. For this reason, the processing load in the user apparatus 50 can be significantly reduced.

[Other Embodiments]
As described above, the embodiments have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to an embodiment in which changes, replacements, additions, omissions, and the like are appropriately performed.
Therefore, other embodiments will be exemplified below.

(A) In the above embodiment, an example has been described in which a plurality of transport streams TS_1 to TS_n are individually recorded in the recording unit 63 by demultiplexing the transport stream group TSG. On the other hand, the transport stream group TSG may be recorded in the recording unit 63 without being released. In this case, as shown in FIG. 5, the multiplexing of the transport stream group TSG is canceled by the stream demultiplexer 62 (an example of the stream demultiplexer 62) when the user requests output. Even in this case, it is not necessary to generate the transport streams TS_1 to TS_n corresponding to the broadcast channel based on the broadcast data of the recording unit 63, so that the processing load on the user device 50 can be greatly reduced.

(B) In the above embodiment, an example in which one transport stream group TSG is generated by multiplexing a plurality of transport streams TS_1 to TS_n has been described. Instead, a plurality of transport stream groups TSG may be generated based on the plurality of transport streams TS_1 to TS_n. In this case, since a plurality of transport stream groups TSG can be generated, the bit rate at the time of transcoding can be increased and the broadcast image quality can be improved.

(C) In the above embodiment, the number of broadcast streams included in one transport stream group TSG was not discussed, but by reducing the bit rate at the time of transcoding, broadcasting included in the transport stream group TSG The number of streams, i.e. the number of broadcast channels delivered, can be increased.
(D) In the above embodiment, the content distribution apparatus 1 has been described with respect to the form including the plurality of tuners 10 and the encoders 16. However, the form without the encoder 16 and only the plurality of tuners 10 or the tuner 10 is not provided. The form provided with two or more encoders 16 may be sufficient.

The present disclosure is widely applicable to a broadcasting system including a transmission device and a reception device.

1 Content distribution device (transmission device)
10 Tuner (first receiver)
13 Data multiplexer (data multiplexer)
14 Stream multiplexer (stream multiplexing unit)
15 Transmitter 16 Encoder 50 User Device (Receiver)
60 Tuner (second receiver)
61 Descrambler (2nd authentication unit)
62 Demultiplexer for stream (Multiple stream cancellation unit)
63 Recording unit 64 Selection unit 65 Output unit

Claims

A broadcast system configured by a transmission device that transmits broadcast streams corresponding to broadcast waves of a plurality of broadcast channels, and a reception device that receives the broadcast stream from the transmission device,
The transmitter is
A data multiplexing unit that multiplexes broadcast data corresponding to each of the plurality of broadcast waves, and generates a plurality of the broadcast streams;
A stream multiplexing unit that multiplexes a plurality of the broadcast streams and generates a multiplexed broadcast stream;
A transmission unit for transmitting the multiplex broadcast stream to the receiving device;
With
The receiving device is:
A receiving unit for a receiving device that receives the multiplex broadcast stream from the transmitting device;
A demultiplexing unit that demultiplexes the multiple broadcast streams and restores the multiple broadcast streams;
A plurality of the broadcast streams returned by the multiple stream release unit, or a recording unit for recording the multiple broadcast streams;
An output unit for outputting a plurality of the broadcast streams;
Comprising
Broadcast system.
The transmission device further includes a reception unit for a transmission device that individually receives a plurality of the broadcast waves,
The data multiplexing unit multiplexes broadcast data corresponding to each of the plurality of broadcast waves received by the reception unit for the transmission device, and generates a plurality of the broadcast streams.
The broadcasting system according to claim 1.
The recording unit records the multiplex broadcast stream;
The multiplex stream release unit demultiplexes the multiplex broadcast stream read from the recording unit, and returns a plurality of the broadcast streams.
The broadcasting system according to claim 1 or 2.
The transmitter is
A broadcast data changing unit that transcodes the broadcast data corresponding to each of the plurality of broadcast waves;
The broadcast system according to any one of claims 1 to 3, further comprising:
The broadcast data changing unit sets a bit rate of the broadcast data according to the content of the broadcast wave.
The broadcast system according to claim 4.
The transmission device further includes an encoder that encodes at least one of video data and audio data,
The data multiplexing unit multiplexes broadcast data corresponding to each of the plurality of broadcast waves output from the encoder, and generates a plurality of the broadcast streams.
The broadcasting system according to any one of claims 1 to 3.
The transmitter is
A first authenticating unit for performing program authentication on the broadcast wave received by the receiving unit for the transmitting device;
Further comprising
The receiving device is:
A second authenticating unit for performing program authentication on the multiplex broadcast stream received by the receiving unit for the receiving device;
Further comprising
The broadcasting system according to any one of claims 1 to 6.
The multiplex broadcast stream is included in one physical channel.
The broadcasting system according to any one of claims 1 to 7.
A transmission device that transmits a broadcast stream corresponding to broadcast waves of a plurality of broadcast channels to a reception device,
A data multiplexing unit that multiplexes broadcast data corresponding to each of the plurality of broadcast waves, and generates a plurality of the broadcast streams;
A stream multiplexing unit that multiplexes a plurality of the broadcast streams and generates a multiplexed broadcast stream;
A transmission unit for transmitting the multiplex broadcast stream to the receiving device;
A transmission apparatus comprising:
A receiving device that receives a multiplex broadcast stream obtained by multiplexing a plurality of broadcast streams from a transmission device that multiplexes a plurality of broadcast streams corresponding to broadcast waves of a plurality of broadcast channels,
A receiving unit for receiving the multiplex broadcast stream;
A demultiplexing unit that demultiplexes the multiple broadcast streams and restores the multiple broadcast streams;
A plurality of the broadcast streams returned by the multiple stream release unit, or a recording unit for recording the multiple broadcast streams;
An output unit for outputting a plurality of the broadcast streams;
A receiving device.