JP2003037824A - Mpeg stream switching method and apparatus thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an MPEG stream switching method for replacing the desired elementary stream of a transport stream composed of a plurality of elementary streams with a desired stream for replacement by simple method and apparatus, and at the same time for maintaining the continuity of the transport stream and the stream for replacement in the case of the switching of an MPEG stream used for digital broadcasting or the like; and to provide an MPEG stream switching apparatus. SOLUTION: PCR that exists in the desired elementary stream of a transport stream composed of a plurality of elementary streams is reproduced, an elementary stream for replacement is created based on the reproduced PCR, and replacement to the desired elementary stream is carried out for sending the transport stream.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an MPEG stream switching method and an MPEG stream switching device.
More specifically, when a part of the transport stream is replaced with a desired stream, the MPEG stream switching method and the MPE that can carry out the replacement while maintaining the continuity between the transport stream and the desired stream.
The present invention relates to a G stream switching device.

[0002]

2. Description of the Related Art Conventionally, in a local broadcasting station (sub station),
Of the broadcast programs distributed from key stations (main stations),
CM of each local station with program of desired time zone
(Commercial) and replaces the broadcast program, and broadcasts a broadcast program with a unique organization of the local station.

A case where such CM or broadcast program replacement is performed by digital broadcasting will be described with reference to FIG. FIG. 4 is a schematic diagram of a digital broadcast transmission / reception system including a main station (key station) 100A, a sub station (local station) 200A, and a receiver 300A.

The main station (key station) 100A transmits video / audio / data etc. to each channel (CH1 to CHn).
Encoder 1 that encodes (packetizes) according to the EPG format to generate / transmit an elementary stream
10A, and a multiplexing unit (MUX) 130A that multiplexes the elementary streams from each encoder 110A and sends the multiplexed elementary stream as a main station stream (transport stream) to the sub station 200A.

The sub-station (local station) 200A uses the original commercial (commercial) and broadcast program of each local station as MPEG.
The replacement stream creation unit 210A that encodes (packetizes) according to the format, the desired CM / broadcast program location of the main station stream distributed from the main station 100A, and the local station unique created by the replacement stream creation unit 210A The stream switching device includes a switching unit 250A that replaces the CM / broadcast program and creates and outputs a substation stream.

The receiver 300A receives the sub station stream from the sub station 200A via a wireless network (satellite broadcasting, terrestrial broadcasting, etc.) or a wired network (cable television, etc.), and watches a broadcast program of a desired channel. can do.

FIG. 5 is a block diagram specifically showing the main part of the stream switching device of the sub-station 200A. The replacement stream creating section 210A including an encoder 220A and a PCR creating section 240A, and a switching section 250A. Consists of.

[0008] The PCR generator 240A is based on a reference signal (black burst signal) in its own station and is PCR (Program C) which is time information serving as a reproduction reference of a broadcast program.
lock Reference), and the encoder 2
20A video coding unit (PTS / DTS processing unit) 221A
And a speech coding unit (PTS processing unit) 222A and a multiplexing unit 224A.

The encoder 220A encodes (packetizes) the replacement video signal according to the MPEG format.
And the PCR generated by the PCR generation unit 240A.
Video coding unit (PT that adds PTS / DTS based on
S / DTS processing unit) 221A and the replacement audio signal M
A voice encoding unit (PTS processing unit) that encodes (packetizes) according to the EPG format and adds PTS based on the PCR generated by the PCR generation unit 240A.
222A and control information, information necessary for decoding, etc.
PSI (Progr generated according to PG format
am Specific Information) generating unit 223A and P generated by the PCR generating unit 240A.
CR and video coding unit (PTS / DTS processing unit) 221A
/ Voice coding unit (PTS processing unit) 222A / PSI generation unit 223A and a multiplexing unit 224A that multiplexes coded signals (packets) to create a replacement stream and sends it to the switching unit 250A.

The switching unit 250A replaces the master stream from the master station 100A with the replacement stream created by the replacement stream creation unit 210A to create a sub-station stream having a unique organization of the sub-station 200A. Switch 25
1A and time information which is the reproduction reference of the broadcast program included in the PID (packet identification information) of the sub-station stream from the switch 251A in order to maintain the continuity of the stream (sub-station stream) on the receiver 300A side. PCR and PT that is time information for managing the display time of the elementary stream generated by the encoder 110A of each channel
S (Presentation Time Stam)
p) and DTS (Decoding Time) which is time information for managing the decoding time of each elementary stream.
Samp) and the PID correction unit 252A for sending the sub-station stream after recalculating and replacing.

The main station 100A and the sub station 200 as described above.
In a digital broadcast transmission / reception system including A and a receiver 300A owned by the user, in the main station 100A, encoders 110A for respective channels (CH1 to CHn) are used to perform MPEG / MPG for video / audio / data of broadcast programs. It is encoded (packetized) according to the format to generate an elementary stream, which is sent to the multiplexing unit (MUX) 130A. Multiplexer (MUX) 13
In 0A, the elementary streams from the encoders 110A are multiplexed to create a main station stream (transport stream), which is sent to the sub station 200A.

In the substation (local station) 200A, the main station 1
The master station stream from 00A is received. On the other hand, PCR
The generation unit 240A generates a PCR based on the reference signal (black burst signal) in its own station, and replaces the generated PCR with the encoder 220A of the replacement stream generation unit 210A.
Send to.

In the encoder 220A of the replacement stream creating section 210A, a video signal coding section (PTS / DTS processing section) 221A codes a video signal such as a CM for replacement or a broadcast program, and the PCR generation section 240A outputs the coded signal. PTS / DTS is generated based on PCR and added to the multiplexing unit 2
Send to 24A. Speech coding unit (PTS processing unit) 222A
Encodes an audio signal such as a CM for replacement or a broadcast program, and PTs based on the PCR from the PCR generation unit 240A.
S is generated, added, and sent to the multiplexing unit 224A. Also PS
The I generation unit generates the control information and the like necessary for decoding the video / audio stream in the receiver 300A, and the multiplexing unit 22
Send to 4A.

The multiplexing unit 224A has a PCR generation unit 240.
Based on the PCR from A, the video encoding unit (PTS / DT
S processing unit) 221A and speech coding unit (PTS processing unit)
222A and the packet from the PSI generation unit 240A are multiplexed to create a replacement stream for replacing a part of the main station stream and send it to the switching unit 250A.

The switch 251A of the switching unit 250A replaces the CM or broadcast program (elementary stream) at a desired position of the main station stream from the main station 100A with the replacement stream created by the replacement stream creation unit 210A. Therefore, switching processing is performed to create a sub-station stream. Subsequently, the PID correction unit 252A corrects the shift between the PCR of the replacement stream and the PCR of the main station stream in order to maintain the continuity of the stream (within the sub-station stream) on the receiver 300A side. The PTS that specifies the display time on the receiver side and the DTS that specifies the decoding start time are recalculated and corrected, and the corrected PCR / PCR
The receiver 3 receives the substation stream that has been replaced with PTS / PTS.
Send to 00A.

In this way, in the sub station 200A,
Even when the desired CM (commercial) or broadcast program in the main station stream is replaced and the local station's original composition is broadcast, reference time information at the time of reproduction of the main station stream and the replacement stream that occurs at the time of replacement = PCR A method is adopted in which the deviation is corrected and transmitted, and the continuity of the stream when viewed by the receiver 300A is maintained so as not to become an obstacle.

[0017]

However, in such a method, in the sub station (local station), PCR correction is performed for each elementary stream from each channel,
There is a problem that the recalculation function of PTS / DTS is required. Also, in the multiplexing unit that creates the main station stream,
Since the elementary stream from each encoder is input in an asynchronous GOP (Group of Picture) cycle, in order to seamlessly switch the main station stream and the replacement stream on the sub station side, the switching section is There is also a problem that a GOP synchronization adjustment function is required in addition to providing a large capacity memory.

Furthermore, the amount of information such as video, audio, data, etc. associated with one broadcast program is increasing, and the PID (packet identification information) associated with one broadcast program is increasing.
There is a problem in that the scale of the correction / calculation circuit increases as the processing amount of PCR correction and PTS / DTS recalculation increases, resulting in a very expensive system.

Therefore, MPE used for digital broadcasting, etc.
When the G stream is switched, a desired elementary stream of a transport stream composed of a plurality of elementary streams and a desired replacement stream are replaced by a simple method / apparatus and replaced with the transport stream. There is a problem that must be solved to be able to maintain continuity with the stream for use.

[0020]

In order to solve the above-mentioned problems, an MPEG stream switching method and MP according to the present invention.
The EG stream switching device has the following configuration.

(1) A PCR existing in a desired elementary stream of a transport stream composed of a plurality of elementary streams is reproduced, and an elementary stream for replacement is created based on the reproduced PCR. An MPEG stream switching method, characterized in that a transport stream is transmitted in place of the desired elementary stream. (2) The MPEG stream switching method according to (1), wherein the PTS / DTS synchronized with the played PCR is added to the replacement elementary stream. (3) A frame synchronization signal of a video stream included in the desired elementary stream is detected, and the replacement elementary stream is created based on the detected frame synchronization signal (1 )
The MPEG stream switching method described in 1. (4) The MPEG stream switching method according to (1), characterized in that the replacement elementary stream is created by encoding an audio signal and a video signal based on the reproduced PCR. (5) The MPEG stream switching method according to (1), characterized in that the replacement elementary stream is created using an elementary stream generated in advance based on the reproduced PCR. (6) The MPEG stream switching method according to (1), wherein the replacement elementary stream generates a second MPEG stream based on a desired PID existing in the transport stream.

(7) A means for receiving a first MPEG stream composed of a plurality of elementary streams, and a desired elementary stream of the first MPEG stream received by the means for receiving. Time information reproducing means for reproducing the existing time information, and the second MP based on the time information reproduced by the time information reproducing means.
A stream creating means for creating an EG stream; and a stream replacing means for replacing the desired elementary stream of the received first MPEG stream with the second MPEG stream created by the stream creating means. An MPEG stream switching device characterized in that (8) The time information reproduced by the time information reproducing means is P
The MPEG stream switching device according to (7), which is a CR. (9) The stream creating means creates a second MPEG stream by encoding an audio signal and / or a video signal based on the time information reproduced by the time information means. MPEG stream switching device. (10) The MPEG according to (7), characterized in that the stream creating means creates a second MPEG stream using an MPEG stream generated in advance.
Stream switching device. (11) The stream creating means creates a second MPEG stream based on a frame synchronization signal of a video stream included in the desired elementary stream detected by the time information reproducing means. The MPEG stream switching device according to (7). (12) The stream creating means is configured to receive the received first
The MPEG stream switching device according to (7), wherein the second MPEG stream is generated based on a desired PID existing in the MPEG stream.

With the MPEG stream switching method and the MPEG stream switching device, the first MPEG
Since the PCR existing in the desired elementary stream of the stream (transport stream) is reproduced and the second MPEG stream (replacement stream) is created based on the reproduced PCR, the first MPEG stream and the second MPEG stream are generated. The same time information (PC
The stream becomes a stream according to R), and when the stream is replaced, the continuity of the stream can be maintained even if the switching unit does not have a complicated processing function such as a PCR or a PTS / DTS recalculation function.

Also, the elementary streams (CM and broadcast programs) that compose the first MPEG stream are individually P
Even if it has a CR, if the PID of the elementary stream (CM or broadcast program) to be replaced is specified, the same time information (PCR) as the desired CM or broadcast program in the first MPEG stream is specified. A second MPEG stream, which is a replacement stream, is created by and the continuity of the stream can be maintained.

Further, the time information reproducing means detects the frame synchronizing signal of the video stream included in the received first MPEG stream, and the stream creating means synchronizes with the frame synchronizing signal detected by the time information reproducing means. By performing the encoding process to create the second MPEG stream, the desired elementary stream and the replacement stream can be replaced in GOP units and the continuity of the stream can be maintained even without the GOP synchronization adjustment function. can do.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of an MPEG stream switching method and an MPEG stream switching device according to the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram of a digital broadcast transmitting / receiving system including a main station 100, a sub station 200, and a receiver 300.

The main station 100 uses a PCR (Program Clock) which is time information as a reproduction reference of a broadcast program.
An encoder 110 that includes a PCR generation unit 120 that generates a Reference), and that generates / transmits video / audio / data and the like as an elementary stream according to the MPEG format for each channel (CH1 to CHn).
And a multiplexing (MUX) unit 1 that multiplexes the elementary streams from the encoders 110 and sends them to the sub station 200 as a main station stream (transport stream).
30 and 30 are provided.

The sub station (local station) 200 is provided with a replacement stream creating section 210 for encoding (packetizing) CM (commercial) or broadcast program unique to each local station in accordance with the MPEG format, and transmitting the same. And a switching unit 250 for replacing the CM / broadcast program unique to the local station from the replacement stream creation unit 210, that is, the replacement stream with a stream at a predetermined position of the main station stream. It has an MPEG stream switching device.

The replacement stream creating section 210 includes a PCR reproducing section 240, and an encoder 220 for creating / transmitting replacement CM, video / audio / data of a broadcast program, etc. as a replacement stream according to the MPEG format.
And a server 230 which is provided with a PCR reproducing unit 240, which converts a replacement CM or an audio / video signal of a broadcast program in accordance with the MPEG format and stores it in advance as a replacement stream.

The receiver 300 receives the sub station stream from the sub station 200 via a wireless network (satellite broadcasting, terrestrial broadcasting, etc.) or a wired network (cable television, etc.) and views a broadcast program of a desired channel. can do.

FIG. 2 is a block diagram specifically showing the main part of the MPEG stream switching device of the substation 200.
It is composed of an encoder 220, a PCR reproducing section 240, and a switching section 250. The server 230 is omitted.

The encoder 220 encodes (packetizes) the replacement video signal in accordance with the MPEG format, and adds a PTS / DTS based on the PCR reproduced by the PCR reproducing unit 240.
DTS processing unit 221 and the replacement audio signal to MPEG.
A voice encoding unit (PTS processing unit) 222 that encodes (packetizes) according to the format and adds PTS based on the PCR reproduced by the PCR reproducing unit 240
And PSI (Program S) that generates control information and information necessary for decoding in accordance with the MPEG format.
(specificInformation) generation unit 223
And the PCR reproduced by the PCR reproducing unit 240 and the encoded signal (packet) from the video encoding unit (PTS / DTS processing unit) 221 / audio encoding unit (PTS processing unit) 222 / PSI generation unit 223. It is composed of a multiplexing unit 224 that converts the data into a replacement stream and sends it to the switching unit 250. The video coding unit (PTS / DTS processing unit)
The function 221 may be provided with a function of performing encoding processing in synchronization with the time stamp from the PCR reproducing unit 240.

The PCR reproducing section 240 includes an encoder 220 and a server 230 which form the replacement stream creating section 210.
As shown in FIG. 3, the PID (Pack) that is provided in the PCR packet latch 242 and extracts the PCR (main station) from (the TS packet of) the main station stream.
et Identification) filter 241
According to the latch control pulse, a PCR packet latch 242 for sending the PCR (main station) from the PID filter 241 to the comparator 243, a PCR (main station) from the PCR packet latch 242, and a PC generated by the PCR counter 246.
The comparator 243 that sends a comparison value that compares the phase difference with R to the DA unit 244, and the comparison value from the comparator 243 is D / A converted (AC component cut) into a control voltage, and the VCXO 245
To the DA unit 244 and the VCXO that oscillates a predetermined clock signal (27 MHz) according to the control voltage of the DA unit 244.
(Voltage Controlled Cryst
al Oscillator; Voltage controlled crystal oscillator) 2
45 and a PC based on the clock signal of the VCXO 246.
A PCR counter 246 which reproduces R and outputs it to the outside, and sends it to the PCR counter latch 247, and a PC reproduced by the PCR counter 246 according to the latch control pulse.
A PCR counter latch 247 for sending R to the comparator 243. The PCR reproducing unit 240 detects the sequence header and GOP header from the encoded video stream (packet group) included in the main station stream, and the time stamp (time information = frame synchronization signal) included in these headers. To extract the video code part (PTS
/ DTS processing unit) 221 may be provided.

The switching unit 250 replaces the main station stream from the main station 100 with the replacement stream created by the replacement stream creation unit 210 to create a sub-station stream having an organization unique to the sub-station 200. It is sent to the receiver 300.

Such a main station 100, a sub station 200,
In the digital broadcast transmission / reception system configured with the receiver 300, the receiver 300 is created by replacing the replacement stream with a desired position of the main station stream to create a sub station stream.
The operation at the time of sending to will be described.

First, in the main station 100, each channel (C
In the PCR generation unit 120 of the encoder 110 for each of H1 to CHn), the time information P that is the reproduction reference of the broadcast program is generated.
A CR (main station) is generated, video / audio / data, etc. of a broadcast program are converted according to the MPEG format based on a PCR (main station), generated as an elementary stream, and sent to the multiplexing unit (MUX) 130. To do. Each encoder 110 has its own PCR (main station) and is randomly sent to the multiplexing unit 130.
The multiplexing unit 130 multiplexes the elementary streams sent at random from each encoder 110 to create a main station stream (transport stream) and sends it to the sub station 200.

In the sub station (local station) 200, the main station 10
Master station stream from 0 (transport stream)
Is received, the CM (commercial) or broadcast program unique to each local station is sent to the replacement stream creating unit 210 in order to replace it with a predetermined location of the main station stream.

In the replacement stream creating section 210, first,
The PC to be replaced by the PID filter 241 from (the TS packet of) the main station stream by the PCR reproducing unit 240 included in the encoder 220 or the server 230.
The packet including R (main station) is extracted and PCR (main station)
Take out and send to PCR packet latch 242, PC
The R packet latch 242 follows P in accordance with the latch control pulse.
The PCR (main station) from the ID filter 241 is compared with the comparator 24.
Send to 3. Then, the phase difference between the PCR generated by the PCR counter 246 and the PCR (main station) is compared by the comparator 243, and the comparison value is sent to the DA unit 244.
In 4, the comparison value from the comparator 243 is D / A converted (AC component cut) and sent to the VCXO 245 as a control voltage. VC
The XO 245 oscillates a predetermined clock signal (27 MHz) according to the control voltage of the DA unit 244 to generate the PCR counter 2.
Send to 46. In the PCR counter 246, the VCXO24
The PCR is reproduced based on the clock signal of 6 and output to the outside, and the reproduced PCR is transmitted to the PCR counter latch 2
Send to 47. The PCR 247 sends the PCR reproduced by the PCR counter 246 to the comparator 243 in accordance with the latch control pulse. In this way, the PCR for creating the replacement stream is reproduced based on the PCR (main station) at the desired replacement location in the main station stream.

In the encoder 220, the video code part (PT
(S / DTS processing unit) 221 encodes (packetizes) a video signal such as a CM or a broadcast program to be inserted according to the MPEG format, and also generates a PTS / DTS based on the PCR reproduced by the PCR reproducing unit 240. Are added and sent to the multiplexing unit 240. An audio encoding unit (PTS processing unit) 222 encodes (packetizes) an audio signal such as a CM or a broadcast program to be inserted according to the MPEG format, and generates a PTS based on the PCR reproduced by the PCR reproducing unit 240. Are added and sent to the multiplexing unit 240.
Also, the PSI generation unit 223 packetizes control information, information necessary for decoding, and the like according to the MPEG format and sends it to the multiplexing unit 224. In the multiplexing unit 224, the packet from the PCR video encoding unit (PTS / DTS processing unit) 221 / audio encoding unit (PTS processing unit) 222 / PSI generation unit 223 is generated based on the PCR reproduced by the PCR reproducing unit 240. The multiplexed stream is created by multiplexing and is sent to the switching unit 250.

On the other hand, in the server 230, the replacement C
An audio / video signal of M or a broadcast program is previously stored as an elementary stream converted according to the MPEG format, and a replacement stream is created based on the PCR reproduced by the PCR reproducing unit 240 and is sent to the switching unit 250. .

The switching unit 250 replaces the main station stream from the main station 100 with the replacement stream created by the encoder 220 of the replacement stream creating unit 210 or the server 230, and moves to the desired position of the main station stream. The replacement stream is replaced to create a substation stream having a unique organization of the substation 200, and the substation stream is sent to the receiver 300.

The PCR reproducing unit 240 detects the sequence header and GOP header from the encoded video stream (packet group) included in the main station stream,
A function is provided for extracting the time stamp (frame synchronization signal) included in these headers and sending it to the video coding unit (PTS / DTS processing unit) 221, and the video coding unit (PTS / DTS processing unit) 221 of the encoder 220 has By providing the function of performing the encoding process in synchronization with the time stamp from the PCR reproducing unit 240, the switching unit 250 can replace the master station stream and the replacement stream in GOP units.

When the receiver 300 receives a desired channel from the substation stream from the substation 200 via a wireless network (satellite broadcasting, terrestrial broadcasting, etc.) or a wired network (cable TV, etc.), a CM or broadcast program is received. Will watch the broadcast replaced by the one unique to the local station.

[0045]

As described above, based on the time information (PCR) included in the desired elementary stream of the main station stream (transport stream), M
Since the PCR is reproduced by the PEG stream switching device and the replacement stream is created by the reproduced PCR,
The transport stream and the replacement stream are created with the same time information (PCR), and when the stream is replaced, PCR or PTS /
The continuity of the transport stream and the replacement stream is maintained even if the DTS recalculation function and other complicated processing functions are not provided. Therefore, PCR and PTS / DTS
Since the processing function such as the recalculation function is unnecessary, the CM or the broadcast program can be replaced by the switching device having a simple circuit configuration.

Further, even when the CM or broadcast program of the elementary stream forming the main station stream is created based on the unique PCR, the PID of the CM or broadcast program desired to be replaced by the MPEG stream switching device.
If you specify, the replacement stream will be created with the PCR that is played back based on the PCR that is unique to the desired CM or broadcast program in the main station stream, so when you replace the stream, you can replace it with the transport stream. Stream continuity is maintained.

Further, the PCR reproducing section detects a frame sync signal of a desired video stream included in the main station stream, performs coding processing in synchronization with the frame sync signal extracted by the video coding processing section, and replaces it. By creating the stream for use, it is possible to replace the desired elementary stream of the main station stream with the replacement stream on a GOP basis and maintain the continuity of the stream without the GOP synchronization adjustment function. The GOP synchronization adjustment function, which requires a large-capacity memory, becomes unnecessary, and the circuit configuration of the switching unit can be simplified.

Further, the PCR generating section provided in the encoder of the main station and the PCR reproducing section provided in the encoder of the sub station are almost the same as the circuit configuration of the PCR reproducing section used in the receiver and the like, so that addition to each encoder is not required. It is easy and it is possible to create an elementary stream based on a unique PCR for each channel of the main station.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an outline of a digital broadcast transmission / reception system by an MPEG stream switching method according to the present invention.

FIG. 2 is a block diagram showing a configuration of an MPEG stream switching device according to the present invention.

[Fig. 3] P of an MPEG stream switching device according to the present invention
It is a block diagram of a CR reproducing unit.

FIG. 4 is a schematic diagram showing a configuration of a transmission / reception system using an MPEG stream switching device according to a conventional technique.

FIG. 5 is a block diagram of an MPEG stream switching device in the prior art.

[Explanation of symbols]

100; Main station, 110; Encoder, 120; PCR generation section, 130; Multiplexing (MUX) section, 200; Sub station, 2
10; replacement stream creation unit, 220; encoder, 2
21: video encoding unit (PTS / DTS processing unit), 22
2; voice coding unit (PTS processing unit), 223; PSI generation unit, 224; multiplexing unit, 230; server, 240; P
CR reproducing unit, 241; PID filter, 242; PCR
Packet latch, 243; comparison section, 244; DA section, 2
45; VCXO, 246; PCR counter, 247; P
CR counter latch, 250; switching unit, 300; receiver 100A; master station, 110A; encoder, 120A;
PCR generation unit, 130; Multiplexing (MUX) unit, 200
A: Substation, 210A; Replacement stream creation unit, 220
A: Encoder, 221A: Video coding unit (PTS / D
TS processing unit), 222A; voice encoding unit (PTS processing unit), 223A; PSI generation unit, 224A; multiplexing unit,
240A; PCR generation unit, 250A; switching unit, 251
A: switch, 252A; PID correction unit, 300A; receiver

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5C059 KK39 MA00 RB01 RB10 RC03                       RC04 RC32 RE04 SS02 UA02                       UA09                 5C063 AB03 AB07 AC01 AC05 AC10                       CA11 CA14 CA23 CA36                 5K028 AA07 BB04 CC05 DD03 EE03                       MM16 NN01                 5K047 AA16 CC02 CC08 DD02 HH01                       HH42 MM02 MM11

Claims (12)

[Claims] 1. A PCR existing in a desired elementary stream of a transport stream composed of a plurality of elementary streams is reproduced, and the reproduced PC is reproduced.
An MPEG stream switching method, characterized in that an elementary stream for replacement is created based on R, and the transport stream is sent after replacing it with the desired elementary stream. 2. The M according to claim 1, wherein the PTS / DTS synchronized with the reproduced PCR is added to the replacement elementary stream.
PEG stream switching method. 3. A frame synchronization signal of a video stream included in the desired elementary stream is detected,
The MPEG stream switching method according to claim 1, wherein the replacement elementary stream is created based on the detected frame synchronization signal. 4. The MPEG stream switching method according to claim 1, wherein the replacement elementary stream is created by encoding an audio signal and a video signal based on the reproduced PCR. 5. The MPEG stream switching method according to claim 1, wherein the replacement elementary stream is created by using an elementary stream generated in advance based on the reproduced PCR. 6. The desired elementary stream existing in the transport stream is the replacement elementary stream.
The MPEG stream switching method according to claim 1, wherein the second MPEG stream is generated based on the ID. 7. A means for receiving a first MPEG stream composed of a plurality of elementary streams, and a desired elementary stream included in the first MPEG stream received by the receiving means. Time information reproducing means for reproducing the time information to be reproduced, stream creating means for generating a second MPEG stream based on the time information reproduced by the time information reproducing means, and a desired element of the received first MPEG stream. The mental stream and the second M created by the stream creating means.
An MPEG stream switching device, comprising: a stream replacing means for replacing a PEG stream. 8. The M according to claim 7, wherein the time information reproduced by the time information reproducing means is PCR.
PEG stream switching device. 9. The stream creating means creates a second MPEG stream by encoding an audio signal and / or a video signal based on the time information reproduced by the time information means. MPE described in
G stream switching device. 10. The MPEG stream switching device according to claim 7, wherein the stream creating means creates a second MPEG stream by using an MPEG stream that is generated in advance. 11. The stream creating means creates a second MPEG stream based on a frame synchronization signal of a video stream included in the desired elementary stream detected by the time information reproducing means. The MPEG stream switching device according to claim 7. 12. The MPEG stream switching according to claim 7, wherein the stream creating means generates a second MPEG stream based on a desired PID existing in the received first MPEG stream. apparatus.