JPH1127668A - Transmission device and method, reception device, and transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmitter that transmits high quality AV data with sophisticated functions by reducing a bit rate of a PCR in the transmission data as less as possible and assigning more data to the AV data by the reduced rate with respect to the transmitter that multiplexes a plurality of MPEG2-TS signals and transmits the multiplexed signals. SOLUTION: A PCR control section 11 of the transmitter 10 reads a PCR value of a 1st encoder 12-1 at the arrival of a first house SYNC and adds PCR values by one video frame to the read PCR value and sends the result to all encoders 12-1 -12- N. The N sets of the encoders 12-1 -12- N use the received common PCR after succeeding house SYNC to encode AV data. A multiplexer 13 multiples a plurality of encoded MPEG2-TS signals and the common PCR and transmits the resulting data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitting apparatus for transmitting a plurality of types of AV data conforming to an MPEG transport stream, a transmitting method thereof, a receiving apparatus for receiving the AV data transmitted by the transmitting apparatus, and The present invention relates to a transmission device including the transmission device and the reception device, which can appropriately transmit AV data.

[0002]

2. Description of the Related Art MPEG2 (Moving Picture coding Exp)
erts Group's high-quality video coding method), multiplexing a plurality of program data that are AV data (audio data and / or video data) and providing them for transmission such as broadcasting and communication A stream called a transport stream (TS) is defined as a stream that can be used.

In this MPEG2 transport stream (MPEG2-TS), a PCR (Pro
It is stipulated to synchronize the transmitting side and the receiving side using data called "gram Clock Reference". This P
The CR is not present in every packet of the MPEG2-TS, but is included in the PCR in the packet of the designated PID.
Present only when the flag is '1'.

[0004] This PCR is a program clock reference extension (pro
gram clock reference extension) and the program clock reference base (program
clock reference base).
Program clock reference extension is 0
２299 are counted, and the carry is used to increment the program clock reference base by one. M
Since the system clock of the PEG2 system is 27 MHz, the time of 24 hours can be counted in 27 MHz clock units with this 42-bit counter. That is, PCR can be said to be a PCR counter value (PCR value) counted by the system clock.

[0005] A method of synchronizing between the transmitting side and the receiving side using the PCR will be described with reference to FIG. On the transmission side, the PCR value counted by the system clock CLK _S is transmitted as data in the MPEG2-TS simultaneously with the transmission. On the receiving side, the system clock CLK _R is locked by the PLL circuit so that the time when the packet arrives becomes the same as the transmitted PCR value. In this case, if the delay due to the transmission is constant, can be obtained clock of the same frequency as the transmitting side at the receiving side, the system clock CLK _R of the receiving system clock CLK _S on the transmission side is synchronized.

FIG. 7 shows a conventional AV data transmission system using MPEG2-TS. The transmission system 9 has a configuration in which a transmission device 90 and a reception device 94 are substantially connected by a transmission line 93. Transmission device 90
Has _N encoders 91 _{-1 to} 91 _-N and a multiplexer 92, and outputs the MP output from the multiplexer 92.
The EG2-TS is multiplexed by the multiplexer 92 and output as one stream. Further, in the receiving device 94, a plurality of M
The data to be decoded is selected from the PEG2 stream by the selection switch 96, and the data is decoded by the decoder 97 in synchronization with the PCR included in the selected MPEG2 stream.

[0007] In such a transmission system 9,
Multiplexer 92 multiplexes a plurality of MPEG2 streams having unique PCRs into one MPEG2 stream.
To generate 2-TS, the generated MPEG2-
The TS has a plurality of types of PCR. The bit rate PCRS _MUX of the PCR in the multiplexed MPEG2-TS is represented by Expression 1.

[0008]

(Equation 1)

In Equation 1, N is the number of encoders, and PCRS _i is the i-th encoder 91 _-i (i = 1 to 1).
PCR in MPEG2 stream output from N)
Bit rate.

[0010]

By the way, in the transmission system using the conventional MPEG2-TS as described above, the number of AV data to be multiplexed is increased as shown in the equation 1 and as described above. As the number N of encoders increases, the multiplexed MPEG2-
As the bit rate of the PCR in the TS increases, there is a problem that data that can be allocated to the AV data decreases accordingly. In an actual transmission system, the bit rate of MPEG2-TS that can be transmitted to a transmission path is limited. Therefore, if a little bit rate can be assigned to AV data, higher image quality and higher sound quality of transmission data can be achieved. Therefore, there is an advantage that a higher function can be achieved, and therefore, there is a demand to reduce the bit rate of the PCR shown in Expression 1 as much as possible.

On the receiving device side, a plurality of MPs
The desired MPEG2-TS is selected from the EG2-TS, and the selected MPEG2-TS is decoded in synchronization with the PCR included in the MPEG2-TS.
2- It is necessary to resynchronize using a different PCR every time the TS is changed, that is, every time the channel is changed, and there is a problem that it takes time to achieve the synchronization.

Therefore, an object of the present invention is to provide a plurality of MPs.
An apparatus for multiplexing and transmitting EG2-TS, wherein the bit rate of a PCR in a transmission signal is reduced as much as possible, a data amount is allocated to the AV data, and the AV data is transmitted with high quality and high functionality. It is an object of the present invention to provide a transmission device capable of performing the above. Another object of the present invention is to provide a plurality of MPEG files.
2- When multiplexing and transmitting the TS, the PC in the transmission signal
An object of the present invention is to provide a transmission method capable of reducing the bit rate of R, allocating a data amount to the AV data correspondingly, and transmitting AV data with high quality and high functionality.

Another object of the present invention is to provide a receiving apparatus which can receive data transmitted by such a transmitting apparatus and can instantaneously decode after selecting a channel. Further, another object of the present invention is to provide a method for using a plurality of MPEs.
When the G2-TS is multiplexed and transmitted, the P-
By lowering the bit rate of CR, more data amount is allocated to AV data, and high quality and high performance AV
It is an object of the present invention to provide a transmission device capable of transmitting data and further capable of instantly performing decoding after channel selection.

[0014]

In order to solve the above-mentioned problems, a plurality of MPEG-2s that are finally multiplexed and transmitted are transmitted.
In -TS, encoding was performed using only one common PCR.

Therefore, the transmitting apparatus of the present invention converts an input AV signal into an MPEG-2 signal using a predetermined PCR.
A plurality of encoding means for encoding a TS signal; a PCR instruction means for instructing the plurality of encoding means of the common predetermined PCR; and a plurality of encoding means encoded by the plurality of encoding means. And multiplexing the signal of the predetermined PCR common to the plurality of MPEG2-TSs and the one of the plurality of MPEG2-TSs.
Multiplexing means for generating the multiplexed MPEG2
Transmission means for transmitting the TS to the transmission path.

Specifically, the PCR instructing means detects a PCR used in one of the encoding means, and instructs all the encoding means as a common PCR.
More specifically, the PCR instruction means generates a PCR by itself and instructs all encoding means as a common PCR.

Further, the transmission method of the present invention uses the MPEG2-
A PCR of a TS is generated, and a plurality of input AV signals are converted to MPEG2-TS by using the generated PCR.
Multiplexing a plurality of encoded MPEG2-TS signals and a signal indicating the one PCR,
The multiplexed MPEG2-TS is transmitted.

Further, the receiving apparatus of the present invention comprises a plurality of MPEs.
G2-TS and receiving means for receiving a signal in which one PCR is multiplexed and transmitted; separating means for separating each of the received signals to obtain a plurality of MPEG2-TSs and one PCR; PCR is performed using the plurality of MEPG2-
Each of the plurality of M
Outputting means for outputting a set of PEG2-TS and PCR to a plurality of channels, selecting means for selecting one channel from the plurality of channels, and the MPEG2-TS obtained from the selected channel, Decoding means for decoding in synchronization with the PCR.

Further, the transmission apparatus of the present invention
A plurality of encoding means for encoding the V signal into a signal conforming to the MPEG2-TS standard using a predetermined PCR;
The predetermined PC common to the plurality of encoding means
A PCR instructing unit for instructing R, a plurality of MPEG2-TS signals encoded by the plurality of encoding units, and a signal indicating one of the predetermined PCRs common to the plurality of MPEG2-TSs are multiplexed. And one MPE
Multiplexing means for generating a G2-TS, transmitting means for transmitting the multiplexed MPEG2-TS to a transmission path, transmission path for transmitting the multiplexed MPEG2-TS, and Receiving means for receiving the transmitted MPEG2-TS, separating means for separating each of the received signals to obtain a plurality of MPEG2-TSs and one PCR, and transferring the one PCR to the plurality of MPEG2-TSs; The plurality of MPEG2-Ts are added as corresponding PCRs.
Output means for outputting a set of S and PCR to a plurality of channels; selecting means for selecting one channel from the plurality of channels; and M output from the selected channel
Decoding means for synchronously decoding the PEG2-TS using the corresponding PCR.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the transmitting device and the receiving device are connected via a transmission path,
A transmission system for transmitting AV data in a format defined by MPEG2-TS between the devices will be described. FIG. 1 is a block diagram showing a configuration of an AV data transmission system using MPEG2-TS according to the present embodiment. In the AV data transmission system 1, a transmission device 10 and a reception device 30 are connected via a transmission path 20.

First, the configuration and operation of each unit will be described. First, the transmitting device 10 will be described. Transmission device 1
0 is the PCR controller 11, N encoders 12 _-1 to 1
2 _-N and a multiplexer 13. The PCR control unit 11 and the N encoders 12 _{-1 to} 12 _-N are connected by the Ethernet 14 so that communication can be appropriately performed between arbitrary devices.

The PCR controller 11 controls unification of the PCRs in _N encoders 12 _{-1 to} 12 _-N , which will be described later, so that an MPEG2-TS is generated using a common PCR. Therefore, the PCR control unit 11
The PCR of the specific encoder 12 _-i (i = 1 to N) (i.e., the first encoder 12 _-1 in the present embodiment) among the encoders 12 _{-1 to} 12 _-N is read, and the PCR is set to N. A process for distributing to the encoders 12 _{-1 to} 12 _-N is performed. In addition, an inspection is performed to determine whether or not PCR has been appropriately unified by the processing.

Referring to the flowchart shown in FIG.
The operation of the CR control unit 11 will be specifically described. First, when the process is started (step S10), the PCR control unit 11 sends a message to the first encoder _12-1 via the Ethernet 14 so as to send a PCR (step S11). Based on that request,
Upon receiving the PCR value PCR ₁ from the first encoder 12 _-1 (step S12), PCR control section 11, the PCR value ΔP of 1 video frame to the PCR value PCR ₁
Calculate the value to which CR is added, and use this value for all encoders 1
It is transmitted as a broadcast message to 2 _{-1 to} 12 _-N (step S13).

Each of the encoders 12 _{-1 to} 12 _-N performs encoding based on the transmitted PCR value, whereby
Unification of PCR can be achieved. Then, the PCR control section 11 is actually the result of whether the unification of PCR is successful inspection received from the first encoder 12 _-1, encoder 12 _-2 The results second through N -12- _N (step S14). If the unification of the PCRs has been successful (step S15), the process is terminated (step S1).
6) If the unification of the PCRs is unsuccessful, the process returns to step S11 again, and the unification of the PCRs is repeated.

The first encoder 12 _-1 receives the input A
Encode V data, generate MPEG2-TS,
Output to the multiplexer 13. In addition, the PCR control unit 1
Based on the request from the transmission device 1, the used PCR is provided as a common PCR used for the MPEG2-TS transmitted from the transmission device 10. Furthermore, the first encoder 1
_2-1 indicates whether or not the unified PCR processing has been properly performed.
The input common PCR value and the first encoder 12
_-1 by comparing with a PCR counter value,
This is transmitted to the PCR control unit 11.

The operation of the first encoder _12-1 will be specifically described with reference to the flowchart shown in FIG. First, when the processing is started (step S20), encoding of the input AV data is started immediately, and MPEG
2-TS is generated (step S21). While encoding, the PCR control unit 11 sets the P
When the transmission message of the CR is received (step S2)
2) The PCR used in the current encoding is P
Output to the CR control unit 11 (step S23).

Next, when the above-mentioned PCR value (PCR ₁ + ΔPCR) is received from the PCR control unit 11 (step S24), the transmission detected based on the house sync signal which is the system clock in the transmission device 10 is performed. Apparatus 1
At the time when the encoders 12 _{-1 to} 12 _-N within 0 start encoding using the common PCR, the first
The value of the PCR counter in the encoder 12 _-1, PCR values received in step S24 (PCR ₁ + ΔPCR) and it is checked whether equal (step S25). If these values are equal, it is determined that the PCR value (PCR ₁ + ΔPCR) has been appropriately transmitted from the PCR control unit 11, and a signal to that effect is transmitted to the PCR control unit 11 (step S26). And thereby because unification of PCR is terminated, subsequently the first encoder 12 _-1 to continue normal encoding process (step S27).

If the values compared in step S25 are different, the PCR
It is determined that the R value (PCR ₁ + ΔPCR) has not been transmitted, and a signal to that effect is transmitted to the PCR control unit 11 (step S28). As a result, the PCR control section 11, again because PCR unification process is repeated, also proceeds to step S22 repetition of the following processing in the first encoder 12 _-1.

The encoder _12-2 to 1 the first encoder 12 _-1 except other encoder, i.e., second to N
2- _N also encodes the input AV data,
G2-TS is generated and output to the multiplexer 13.
At this time, in each of the first encoders 12 _-i (i = 2 to N), a predetermined PCR is distributed from the PCR control unit 11 as a common PCR used for the MPEG2-TS transmitted from the transmission device 10. In this case, the encoding is performed by switching the PCR to be used from a predetermined time to the distributed PCR.

The operation of the second to N-th encoders 12 _{-1 to} 12 _-N will be specifically described with reference to the flowchart shown in FIG. First, when the processing is started (step S
30) Immediately start the encoding of the input AV data and generate the MPEG2-TS (step S3)
1). When the above-described PCR value (PCR ₁ + ΔPCR) is received from the PCR control unit 11 while performing the encoding (step S32), the transmitting apparatus 10 detected based on the house sync signal which is the system clock in the transmitting apparatus 10 P common to encoders 12 _{-1 to} 12 _-N within
At time to start the encoded using CR, and starts encoding using the received PCR value (PCR ₁ + ΔPCR) (step S33).

Then, a signal indicating the PCR unification result is received from the PCR control unit 11 (step S34). If the unification is successful, the normal encoding process is continued thereafter (step S35). Further, when the unification of PCR is not successful in step S34, and returns again to step S32, waits for the reception of the PCR value from the PCR control unit 11 (PCR ₁ + ΔPCR), step S32
The following processing is repeated.

The multiplexer 13 is an MPEG2-T encoded by _N encoders 12 _{-1 to} 12 _-N , respectively.
S is multiplexed, converted into one bit stream, and transmitted to the transmission path 20. At that time, the multiplexer 13
For the PCR, any one encoder 12 _-i (i = 1 to N) in the N encoder 12 _-1 to 12 _-N (in this embodiment the first encoder 12 _-1) from the output This is appropriately multiplexed into a bit stream by using only the PCR of the MPEG2-TS.

Next, the receiving device 30 will be described. The receiving device 30 includes a demultiplexer 31 and a selection switch 3
2 and a decoder 33. Demultiplexer 31
Converts a signal multiplexed with a plurality of MPEG2-TS as described above, which is input via the transmission path 20, into an MPEG-2 TS.
2-Separate each program based on a PID (Packet Identification) signal in the TS and output as a signal for each channel. In the MPEG2-TS input via the transmission path 20, one type of unified PC
Since there is only R, the demultiplexer 31 adds the separated PCR to all the separated MPEG2-TSs and outputs it.

The selection switch 32 is switched by a selection signal (not shown), selects one desired MPEG2-TS from the N-channel MPEG2-TS separated by the demultiplexer 31, and outputs it to the decoder 33. .

The decoder 33 decodes the MPEG2-TS selected by the selection switch 32, restores the original AV data, and outputs it from the receiving device 30. The system clock used for this decoding uses the PCR of each MPEG2-TS input to the decoder 33. Regardless of which channel is selected by the selection switch 32, even if the actual data changes, the PCR is performed on all the channels. Are identical.
Therefore, even if the channel is switched, the system clock continues, in other words, synchronization is instantaneously obtained, so that decoding and restoration AV data can be output immediately.

Next, the operation of the AV data transmission system 1 will be described with reference to FIG. FIG. 5 is a diagram for explaining the flow of operation of each unit of the transmission device 10 and the relationship between the operation of each unit. First, when the power of the transmitting apparatus 10 is turned on, the encoders 12 _{-1 to} 12 _-N start the encoding processing, and the multiplexer 13 starts the multiplexing processing. In addition, the PCR control unit 11 includes a first encoder 12
_A message is transmitted via the Ethernet 14 so as to transmit a PCR to the PCR control unit 11 for _-1 .

The first encoder 12 _-1 that has received this message, in synchronism with the interrupt by an absolute synchronization signal is house sync signals in the system, sends the PCR counter value PCR ₁ at that time PCR control section 11 I do. In the example of FIG. 5, the PCR counter value at time T ₀ is sent to the PCR control unit 11. The first PCR control unit 11 which has received the PCR value PCR ₁ from the encoder 12 _-1, 1 video frame of PC to PCR value PCR ₁
A value obtained by adding the R value ΔPCR is calculated, and this value is transmitted to all the encoders 12 _{-1 to} 12 _-N as a broadcast message.

The encoder 12 _-2 to 12 _-N in the second to N that PCR value PCR ₁ to 1 video frame of PCR values DerutaPCR a value obtained by adding (PCR ₁ + ΔPCR) has been received, the encoder 12 _-i (i = 2 to N)
The CR value (PCR ₁ + ΔPCR) is held and the time T
_{At 1} the value is loaded into the PCR counter and the encoding is restarted. Thus, after the sync signal next to the first house sync signal (time T ₁ in FIG. 5), the N encoders 12 _{-1 to} 12 _-N have the same PCR.
Works with Therefore, the multiplexer 13 outputs the time T
_{From 1} onward, for the PCR, the encoders 12 _{-1 to} 12 _-N
Multiplexes only the PCRs in the MPEG2-TS output from an arbitrary encoder.

By the way, this PC for one video frame
The R value ΔPCR is as shown in Equation 2 in the case of the 525/60 system.

[0040]

ΔPCR_base = 27 MHz / 300 / 29.97 Hz = 3003 ΔPCR_ext = 0 (2)

In the case of a 625/50 system, Equation 3
It becomes as shown in.

[0042]

ΔPCR_base = 27 MHz / 300/25 = 3600 ΔPCR_ext = 0 (3)

Therefore, after the time T ₁ as described above, the M output from the _N encoders 12 _{-1 to} 12 _-N
In order to make the PCRs of the PEG2-TS identical, the encoders 12 _{-1 to} 12 _-N must be connected to the PCR controller ₁ before time T 1.
1, it is necessary to receive the PCR value ΔPCR (PCR ₁ + ΔPCR). The interval between time T ₀ and time T ₁ is 52
In the 5/60 system, the time is 33 ms, and data can be transmitted and received via the Ethernet 14 in principle, without any problem. To ensure data transmission, the first encoder _12-1 uses a unified PC.
The R value (PCR ₁ + ΔPCR) is properly adjusted for each encoder 12
_It is checked whether the data has been distributed to _{-1 to} 12- _N .

Before time T ₁ , the PCR value (PCR ₁ + Δ
In order to confirm whether or not the PCR) has been received by the encoders 12 _{-1 to} 12 _-N , the first encoder 12 _-1
In _1, compares the PCR value (PCR ₁ + ΔPCR) a first value of the PCR counter in the encoder 12 _-1 at that time. Time T ₁ before the PCR value (PCR ₁ +
If (.DELTA.PCR) has been received, the compared values are equal, indicating that the PCR value has been properly received. The first encoder 12 _-1, the comparison result of the PCR value, i.e. PCR value whether reception has been performed correctly (PCR ₁ + ΔPCR), sends a message to the PCR control unit 11.

The PCR control unit 11 includes a first encoder 1
PCR from the comparison result of the transmitted come PCR value from 2 _-1
When it is determined that the transmission and reception of the value (PCR ₁ + ΔPCR) is correctly performed, the PCR control unit 11 ends the unification process of the PCR. In addition, the PCR value (PCR ₁ + ΔP
If the delivery of the (CR) was not performed correctly,
The control unit 11 sends the P signal to the first encoder 12 _-1 again.
A message is transmitted so as to transmit the CR, and thereafter, the same processing as described above is performed to unify PCRs.

The MP multiplexed in this way
The signal of the EG2-TS is transmitted to the receiving device 3 via the transmission path 20.
Input to 0. In the receiving apparatus 30, each MPEG2-T
S is separated, a desired channel is selected by the selection switch 32, and the decoder 33 decodes and restores the original AV data to output. At this time, since all the demultiplexed MPEG2-TSs have the same PCR, even if the channel is switched on the way, the system clock can be instantaneously synchronized.

As described above, in the AV data transmission system 1 of the present embodiment, in a signal in which a plurality of MPEG2-TSs are multiplexed, the PCR is unified into one, and the multiplexed MPEG2-TS is used. P in TS
The CR bit rate PCRS _MUX is as shown in Expression 4.

[0048]

[Equation 4] PCRS _MUX = PCRS ₁ (4)

Therefore, the multiplexed MPE
The bit rate of the PCR in the G2-TS can be significantly reduced. Specifically, for example, when N encoders use the same PCR, the bit rate is 1 / N of the conventional transmission method.

Also, as described above, P in MPEG2-TS
Since the bit rate of the CR can be reduced, it is possible to allocate the extra bit to the AV data, so that the image quality and quality of the AV data to be transmitted can be improved, and the function of the transmission system can be enhanced. In addition, it is possible to cope with an increase in multiplexed channels.

On the receiving device side, all MPs
Since the PCR of EG2-TS is the same, M
Even when the PEG2-TS is switched, the operation of synchronizing the system clock for the second time and thereafter is completed instantaneously. That is, the channel can be switched instantaneously.

The present invention is not limited to the present embodiment, and various modifications are possible. For example, AV
In the data transmission system 1, the first encoder 1
_2-1 PCR is detected, and the other encoders 12 _-2 to 1 are detected.
The 2- _N PCR is adapted to this, but the reference PCR is not limited to the PCR of the first encoder _12-1 . First to Nth encoders 12 _{-1 to} 12 _-N
May be used as the reference PCR. Alternatively, the PCR control unit 11 itself may generate a PCR and set the PCR value in all the encoders 12 _{-1 to} 12 _-N . The source and generation method of the reference PCR are not limited at all. In addition, this PCR
The encoding may be started after the value is set. By doing so, from the beginning, a unified PC
MPEG2-TS according to R can be transmitted.

[0053]

As described above, according to the transmitting apparatus and the transmitting method of the present invention, when transmitting an MPEG2-TS in which a plurality of streams are multiplexed, the PCR is unified and transmitted. The bit rate of the PCR can be reduced. As a result, the data amount can be allocated to the AV data accordingly, and the AV data can be transmitted with high quality and high functionality.

According to the receiving apparatus of the present invention, a plurality of MPEG2-TSs transmitted by such a transmitting apparatus are provided.
When receiving the multiplexed signal, the selected M
Synchronization with PEG2-TS can be taken immediately,
As a result, channel selection can be performed instantaneously.

According to the transmission apparatus of the present invention, a low P
Since the MPEG2-TS multiplexed at the CR bit rate can be transmitted, a large amount of data can be allocated to the AV data, and the AV data can be transmitted with high quality and high functionality, and further decoded on the receiving side. MPEG
Synchronization when 2-TS is selected can be instantaneously performed, so that channel selection can be performed instantaneously.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an AV data transmission system according to an embodiment of the present invention.

FIG. 2 shows a PCR of the AV data transmission system shown in FIG.
5 is a flowchart for explaining processing in a control unit.

FIG. 3 is a flowchart for explaining processing in a first encoder of the AV data transmission system shown in FIG. 1;

FIG. 4 is a diagram illustrating a second example of the AV data transmission system shown in FIG.
35 is a flowchart for describing processing in an N-th encoder.

FIG. 5 is a diagram for explaining an operation of the AV data transmission system shown in FIG. 1;

FIG. 6 is a diagram for explaining a method for achieving synchronization between a transmitting side and a receiving side using PCR.

FIG. 7 shows an MPEG2-transport stream (T
FIG. 2 is a diagram showing a configuration of a conventional AV data transmission system using S).

[Explanation of symbols]

1 ... AV data transmission system, 10 ... Transmission device, 11 ...
PCR controller, 12 encoder, 13 multiplexer, 14 Ethernet, 20 transmission line, 30 receiving device, 31 demultiplexer, 32 selection switch, 3
3 Decoder, 9 Transmission system, 90 Transmission device, 9
1 _{-1 to} 91 _-N ... encoder, 92 ... multiplexer, 9
3: transmission line, 94: receiving device, 95: demultiplexer, 96: selection switch, 97: decoder

Claims (6)

[Claims] 1. An input audiovisual (AV)
The signal is sent to a predetermined program clock reference (PC
R) using MPEG2 (Moving Picture coding Exp
a plurality of encoding means for encoding into a signal conforming to a transport stream (TS) specification of a high-quality moving image encoding system by ertsGroup; and the predetermined PC common to the plurality of encoding means.
PCR instruction means for instructing R, and a plurality of MPEG2 encoded by the plurality of encoding means.
Multiplexing means for multiplexing a TS signal and one signal indicating the predetermined PCR common to the plurality of MPEG2-TSs to generate one MPEG2-TS; and the multiplexed MPEG2-TS. Transmitting means for transmitting the signal to a transmission path. 2. The PCR instruction means detects a PCR used by an arbitrary encoding means among the plurality of encoding means, and converts the PCR into another encoding means of the plurality of encoding means. 2. The transmitting apparatus according to claim 1, wherein the instruction is made common to all of the plurality of encoding units so that the PCRs are shared. 3. The PCR indicating means generates a PCR,
2. The transmitting apparatus according to claim 1, wherein the generated PCR is instructed to the plurality of encoding units so that a PCR used in all of the plurality of encoding units is shared. 4. MPEG2 (Moving Picture coding Exper)
A program clock reference (PCR) of a transport stream (TS) of a high-quality moving picture coding system by the ts Group is generated, and a plurality of input audiovisual (AV) signals are input using the generated PCR. MPEG2-T respectively
A method for transmitting the multiplexed MPEG2-TS, wherein the multiplexed MPEG2-TS and the multiplexed MPEG2-TS and the signal indicating one PCR are multiplexed. 5. A plurality of MPEG2 (Moving Picture coding)
A receiving means for receiving a signal multiplexed with a transport stream (TS) of a high-quality moving picture coding system by the Experts Group and one program clock reference (PCR), and separating the received signal from each other And a plurality of MPEG2-T
S and separation means for obtaining one PCR; and adding the one PCR as a PCR corresponding to each of the plurality of MPEG2-TSs,
An output unit that outputs a set of TS and PCR to a plurality of channels; a selection unit that selects one channel from the plurality of channels; and the MPEG2 obtained from the selected channel.
Decoding means for decoding the TS in synchronization with the corresponding PCR. 6. An input audiovisual (AV)
The signal is sent to a predetermined program clock reference (PC
R) using MPEG2 (Moving Picture coding Exp
a plurality of encoding means for encoding into a signal conforming to a transport stream (TS) specification of a high-quality moving image encoding system by ertsGroup; and the predetermined PC common to the plurality of encoding means.
PCR instruction means for instructing R, and a plurality of MPEG2 encoded by the plurality of encoding means.
Multiplexing means for multiplexing a TS signal and one signal indicating the predetermined PCR common to the plurality of MPEG2-TSs to generate one MPEG2-TS; and the multiplexed MPEG2-TS. Transmitting means for transmitting the multiplexed MPEG2-TS, receiving means for receiving the MPEG2-TS transmitted via the transmission path, and transmitting the received signal to the transmission path. Separate multiple MPEG2-T
S and separation means for obtaining one PCR; and adding the one PCR as a PCR corresponding to each of the plurality of MPEG2-TSs,
An output unit that outputs a set of TS and PCR to a plurality of channels; a selection unit that selects one channel from the plurality of channels; and the MPEG2 obtained from the selected channel.
A transmission device comprising: decoding means for synchronously decoding a TS using the corresponding PCR.