JP3408458B2 - Packet conversion processing system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packet conversion processing system, and more particularly to a stream format for selecting and recording and reproducing one or more programs from a transport stream packet in which a plurality of programs are multiplexed. Packet conversion processing system for converting into different program stream packets.

[0002]

2. Description of the Related Art In recent years, MPEG (Moving Picture Exper)
ts Groupe) Digital broadcasting in which video and audio information is encoded by applying high-efficiency encoding technology is becoming popular.
A plurality of high-efficiency coded video and audio information in this digital broadcast are multiplexed in a transport stream in program units. When selecting and recording and / or reproducing one or more programs from the transport stream in which the plurality of programs are multiplexed, the process of selecting one or more programs from the transport stream is not performed especially during recording. , Selecting one program when decoding the above high-efficiency coded video and audio information,
It can be realized without an attached processing circuit.

However, when the transport stream is recorded without performing the program selecting process as described above, it is necessary to record an extra transport stream packet other than one program selected at the time of decoding. There is a problem that the capacity efficiency during recording is lowered.

In order to eliminate this problem, a program for selecting a transport stream when recording and reproducing by selecting one or more programs from a transport stream in which a plurality of programs are multiplexed It suffices to perform packet conversion processing for converting into a program stream having a different stream format consisting of only, and then record.

As this packet conversion processing system, the H.264 standard of the Telecommunication Standardization Sector (ITU-T) of the International Telecommunication Union (ITU) has been conventionally used. 222 (a general-purpose coding system for moving images and accompanying audio). This Recommendation H. 222, the system coding scheme defines two formats, a transport stream and a program stream. Each stream is encoded using time management information for synchronizing the decoding and display of video and audio information and time management information regarding the transmission of the stream itself.

Further, according to the above-mentioned recommendation, the transport stream and the program stream are logically constructed from a packetizing elementary stream which is a common exchange format, and conversion from one stream to the other, in particular, a transport stream. Although it is possible to take out one program content from the port stream and generate the program stream, it is said that not all the information necessary for generating the program stream is included in the transport stream.

Next, the operation of the conventional packet conversion processing system based on the above recommendation will be described with reference to the drawings. FIG. 8 is a block diagram for explaining the operation of an example of a conventional packet conversion processing system. In the conventional packet conversion processing system shown in the figure, first, a TS packet 12a of a transport stream (hereinafter, TS) in which a plurality of programs are multiplexed is input to the PES packet extraction unit 52. P
The ES packet extraction unit 52 extracts the TS packet storing the selected program by the packet identifier (hereinafter, PID) corresponding to the selected program, interprets each header information of the extracted packet, and extracts the TS and the program stream (hereinafter , PS) is a common exchange format for packetized elementary streams (hereinafter PES).
Are extracted and output to the PS packet generation unit 53 as PES packet data 54.

Next, the PS packet generator 53 sequentially inputs the plurality of input PES packet data 54 into each PE.
One PES packet string is configured based on the coding rate of S packet data and the time management information included in the PES packet header information. The pack header information is added to each fixed number of packets of this PES packet sequence, and the PES packet data 55 is encoded into a program stream pack.
A desired recording / reproducing process (accumulation process) is performed as a. However, the program end code is added to the final program stream pack for recording and reproduction.

Further, P included in the pack header information
The time management information (SCR) relating to the transmission of S itself and the time management information (DTS / PTS) for synchronizing the decoding and display of the video and audio information are set to the coding rate of each PES packet data and the PES packet header information. It is newly generated based on the included time management information, and is encoded in the pack header and the PES packet header.

As described above, in the conventional packet conversion processing system, when one or more programs are selected and recorded and reproduced from the TS in which a plurality of programs are multiplexed, program streams having different stream formats are formed. When selecting a plurality of programs from the plurality of programs by performing the above conversion, the program streams for the number of selected programs are generated.

[0011]

However, in the conventional packet conversion processing system, when one or more programs are selected and recorded and reproduced from the transport stream in which a plurality of programs are multiplexed, the stream is processed. There is a problem that the time management information related to the format and synchronization control has to be changed.

The present invention has been made in view of the above points,
When selecting and recording and / or reproducing one or more programs from a transport stream in which a plurality of programs are multiplexed, the amount of information can be changed without changing the time management information related to the stream format and synchronization control. An object of the present invention is to provide a packet conversion processing system capable of realizing reduction and restoration.

[0013]

In order to achieve the above object, the packet conversion processing system according to the first aspect of the present invention selects one or more programs from transport stream packets in which a plurality of programs are multiplexed. when recording to select, without changing the time management information according to the stream format and synchronization control were selected flops
In addition to reducing the amount of information in the payload part of the transport packets of all non-selected programs except the transport stream packet of the program,
A plurality of programs are multiplexed with the conversion means for converting the header information of the transport packet of the computer into a predetermined value .
The information included in one or more sections of the program association table included in the transport stream packet is used to identify the non-selected program.
And deleting means for only information about the selected program by deleting the response information, obtained by the deletion means and converting means
Transport stream for the selected program selected
The packet and the packet of the non-selected program converted to a predetermined value
Recording means for recording the header information of the packet on a recording medium .

Further, in order to achieve the above object, the second
The packet conversion system of the invention of claim 1 is a deletion procedure of the first invention.
The amount of information was reduced by steps and conversion means
Recording the transport stream packets of the program
Of the program selected from the recording medium
Reproduction means for reproducing port stream packets and reproduction
Transpo of selected program played by means
And a reproduction processing unit that detects header information of a predetermined value from the stream stream packet and restores the reduction information of the non-selected packet based on the detected header information. In the first and second inventions described above, when one or more programs are selected from a transport stream in which a plurality of programs are multiplexed and recorded and reproduced, except for the transport stream packet of the selected program. non-transport stream packet of the selected program (non-selected packets) is converted to a null packet, while reducing the information of the payload portion, the non-selected program from the information contained in one or more sections of the program association table Corresponding to
You can delete and record the information you want to restore, and restore it after playback.

[0015]

[0016]

In order to achieve the above object, a packet conversion processing system according to a third aspect of the present invention is a reproduction processing means according to the second invention, wherein a selected program reproduced by the reproduction means is selected.
Of the program selected by the packet read from the memory unit based on the packet identifier information and the packet synchronization information obtained from the transport stream packet read from the memory unit. Detecting means for detecting whether it is a stream packet or header information of a non-selected packet with a reduced amount of information, and when the header information of the non-selected packet is detected by the detecting means, time control of reading of the memory unit is performed. Thus, the memory control means for restoring the reduced payload information is provided.

[0018]

[0019]

[0020]

[0021]

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, each embodiment of the packet conversion processing system according to the present invention will be described with reference to the drawings.

FIG. 1 shows a system configuration diagram of a first embodiment of a packet conversion processing system according to the present invention. As shown in the figure, the packet conversion processing system according to the present embodiment has a program control unit 1, an enable generation unit 2, a PID detection unit 3, a null packet generation unit 4, a delay processing unit 5, and a packet processing unit. A selection unit 6, a program reproduction control unit 7, a memory control unit 10, a synchronization detection unit 9,
And a memory unit 8.

The PID detector 3 is shown in the block diagram of FIG.
The 8-bit latch circuit 29a and the 5-bit latch circuit
Path 30, a 13-bit latch circuit 31, and a 1-bit latch circuit.
Circuit 32a to 32c, and packet enable generation unit 3
4 and 13-bit comparator 35 ₁~ 35_{n + 1}And PID control
And a register section 36.

Further, as shown in FIG. 5, the synchronization detector 9 includes 8-bit latch circuits 29b to 29d, a PID control register 38, an 8-bit comparator 39, a synchronization signal generator 41, and a 13-bit comparison circuit. Each of the units 42 _{1 to} 42 _{n + 2} and the delay processing unit 56.

Next, the operation of the packet conversion processing system according to the first embodiment of FIG. 1 will be described with reference to FIGS. In the packet conversion processing system according to the first embodiment, as schematically shown in FIG. 3A, a 4-byte header aj (j = 1, 2, ...),
TS consisting of the following 184-byte payload bj
TS packet data (Tdin) 12a in which packets are combined in time series is stored in the program control unit 1 of FIG.
The sync signal (Tsin) 1 shown in FIG. 3B is input to the PID detection unit 3 and the delay processing unit 5, respectively, and in synchronization with this.
1a is input to the PID detection unit 3.

Here, the above-mentioned TS packet data 12a
Each payload of, for example, 1 in digital broadcasting
Data of highly efficient coded video and audio information of one or more programs are multiplexed (stored), and a program specific information (PSI) table and a program sequence information (SI) table transmitted by various digital broadcasts are stored. Multiplexed (stored).

When the program control unit 1 selects and records one or more programs from the TS packet data 12a in which the plurality of programs are multiplexed, the program control information (P) unique to the TS packet data 12a (P
The PID information of the TS packet storing the selection program is extracted from the SI) table and the program sequence information (SI) table transmitted by various digital broadcasts.
The information table data 13a is generated and the recording / playback processing unit A is used.
Output to. This PID information table data 13a is
The start pointer 26 and PID data 2 shown in FIG.
It consists of 7.

The PID detection unit 3 receives the selected PID data 14 fetched from the program control unit 1 as an input, sets all the PID information of the PID information table in an internal register, and then sets the set PID information. On the other hand, the TS packet storing the selection program is detected from the input TS packet data 12a and the TS packet synchronization signal 11a. Corresponding PI in this detection
When a TS packet not including D is detected, the packet control signal 15 indicating that the currently input TS packet data 12a is invalid is set to the invalid packet 188.
Be active during the byte period.

The configuration and operation of the PID detecting section 3 will be described in more detail with reference to the block diagram of the PID detecting section 3 of FIG. The PID detection unit 3 is shown in FIG.
The synchronizing signal 11a shown by is delayed by a total of 3 clocks by the 1-bit latch circuits 32a, 32b, and 32c connected in cascade, and the latch enable signal 33 for obtaining the PID data from the TS packet data 12a is generated.

The TS packet data 12a, which is input in 1-byte units in synchronization with the clock, is stored at the time when the latch enable signal 33 becomes active.
In the 8-bit latch circuit 29a, the TS packet data 1
8 bits of the 3rd byte from the beginning of 2a (TD [7 ..
0]), that is, the lower 8 bits (PID [7..0]) in the 13 bits of PID information are held. Similarly, in the 5-bit latch circuit 30, the lower 5 bits of the second byte from the head of the TS packet data 12a are held. Bits (TD [4 ..
0]), that is, the upper 5 bits (PID [1 ... 8]) in the 13 bits of PID information are held.

Then, in the 13-bit latch circuit 31,
At the time of the next clock when the latch enable signal 33 becomes active, the 8-bit latch circuit 29a
By connecting each output of the bit latch circuit 30, the 13-bit PID information (PI
D [12. ． 0]) is retained. The holding period of the PID information in the 13-bit latch circuit 31 is a period until the next latch enable signal 33 becomes active, that is, a 188-byte period until the PID information of the TS packet input next is acquired. Become.

On the other hand, the PID register section 36 has n 13-bit wide PID registers, and the program control section 1
The selected PID data 14 to be input is set. In addition, the PI corresponding to the n PID registers on a one-to-one basis
D setting data 37 (PR1 [12.0 ...] to PRn [1
2. ． 0]) is output.

Further, the 13-bit comparator 35 ₁ holds the PID information of the TS packet held by the 13-bit latch circuit 31, that is, the PID indicating the PAT and the PAT indicating the PAT.
The ID number (0) is compared to determine whether the currently input TS packet is a TS packet including PAT, and P
When it is determined to be AT, a signal indicating an active state is output.

Similarly, n 13-bit comparators 35 ₂ ...
35 _{n + 1} is the PID setting data PR1 [12. ． 0] ~
PRn [12. ． 0]) are input separately and 1
The PID information of the TS packet currently input from the 3-bit latch circuit 31 is commonly input and compared with each other, and the currently input TS packet is the PID information set in the PID register unit 36, that is, , It is determined whether the TS packet storing the selection program,
When it is determined that the TS packet stores the selection program, a signal indicating the active state is output.

When the packet enable generator 34 receives the output signals of the 13-bit comparators 35 _{1 to} 35 _{n + 1} as inputs and detects that all of these input signals are in the inactive state, that is, When it is determined that all the PID information of the TS packet storing the selection program including the PAT does not apply, the packet control signal 15 is activated.

As described above, the PID detector 3 is
By comparing all the PID information of the TS packet storing the selection program set in the register unit 36 with the PID information held in the 13-bit latch circuit 31 detected from the currently input TS packet, Packet control signal 15 for currently input TS packet
To generate. As described above, this packet control signal 1
5 is the currently input T when it is in the active state.
This indicates that the S packet data 12a is invalid.

Referring back to FIG. 1 again, when the null packet generator 4 detects the active state of the packet control signal 15, the null packet generator 4 includes a fixed PID number (0x1FFF) indicating a null packet set in the internal register in advance. Null packet header information of 4 bytes and payload data 1
The null packet data 19 including the stuffing data for 84 bytes is output. In addition, a null packet control signal 2 indicating a 4-byte period of null packet header information
0 is activated during the 4-byte period.

Further, since the delay processing unit 5 matches the input times of the null packet data 19 and the TS packet data 18 in the packet selection unit 6, the total processing delay in the PID detection unit 3 and the null packet generation unit 4 is delayed. The input TS packet 12a is delayed and adjusted by the same amount of time as the time, and is output as TS packet data 18. The packet selector 6 selects and outputs the null packet data 19 while the packet control signal 15 is in the active state. Conversely, while the packet control signal 15 is in the inactive state, the TS packet data 18 input from the delay processing unit 5 is selected and output. As a result, the selection TS indicated by Tdout in FIG.
The packet data 17 is output.

Here, as an example, the header a2 and the payload b2 in FIG. 3 (A) are TSs for which the program is not selected, and the packet control signal 15 is in the active state for a period of 188 bytes of this TS. As shown in C), the null packet data 19 including the null packet header c1 output from the null packet generation unit 4 and the stuffing data d1 is selected and output by the packet selection unit 6, and other than that is selected. Since it is the TS of the program, the input TS packet 12a is directly selected and output.

The enable generator 2 has an inactive state indicating that the packet control signal 15 is a TS packet period in which a selection program is stored, and an active state of a null packet control signal 20 indicating a 4-byte period of null packet header information. 3D, the valid period of the selected TS packet data 17 indicated by Tdout in FIG. 3C is output from the packet selector 6, and Tso in FIG.
The TS control signal 16 as indicated by ut is generated. As a result, the TS control signal 16 becomes a signal that makes the 184-byte period of the payload portion (stuffing data) d1 of the null packet inactive.

The TS control signal 16 is input to the recording / reproducing processing unit A together with the PID data table 13a and the selected TS packet data 17 and recorded on the recording medium as recording data as schematically shown in FIG. . That is,
As shown in FIG. 2, the data to be recorded is composed of a k-byte start pointer 26, PID data 27 storing n pieces of the PID information table in units of 2 bytes, and the selected TS packet data 28. Of these, the start pointer 26 indicates the selected TS packet data 2
It is possible to detect the number of PID data recorded by this information with the address pointer indicating the head of 8. However, in the n pieces of PID data 27 to be stored, the PAT is the TS of the PID data of the PID number (0) indicating the program association table (hereinafter, PAT).
Since it is essential information for controlling packets, it is not included and is not recorded.

In the recording / reproducing processing section A, the PID table data 13a input from the program control section 1 is inputted.
Is the start pointer 26 and the PID data 27 of FIG.
Of the selected TS packet data 17 input from the packet selector unit 6 when the TS control signal 16 is in the active state, the TS packet data a1, b1, a3, b3 storing the selection program,
The header c1 of the null packet data 16 is shown in FIG.
It is recorded as TS data in the recording data indicated by. Therefore, the TS packet data a2, b2 of the non-selected program
Is not recorded, and the null packet header c1 is recorded instead of the header a2.

Next, a TS in which a plurality of programs are multiplexed
A method for selecting and playing one or more programs from the packet will be described.

The program reproduction control unit 7 of FIG. 1 acquires the start pointer 26 added to the head of the recording data reproduced from the recording medium (not shown) by the recording / reproduction processing unit A, and acquires this acquired data. Recorded from
The capacity of the ID table is detected, and PID table data 1
3b is set in the internal register. Further, the selected TS packet data 21 which is reproduced from the recording medium (not shown) by the recording / reproduction processing unit A and which is schematically shown as Tmemin in FIG. 3E is temporarily stored in the memory unit 8.

On the other hand, the memory control unit 10 monitors the memory unit 8 so as not to underflow or overflow,
The writing of the selected TS packet data 21 is controlled. When an inactive state is detected for a null packet control signal 24 described later, the memory unit 8 is read at the time when the 4-byte null packet header c1 is read by the memory control signal 23 indicated by Tmen in FIG. Selection from T
The reading of the S packet data 22 is stopped, and
As indicated by Tmemout in (F), reading of the null packet payload from the memory unit 8 is stopped for 184 bytes. As a result, the information of the payload part of the non-selected TS packet is restored.

The synchronization detection unit 9 selects the selected TS packet data 22 read from the memory unit 8 and the selected PID data 25 set by the program reproduction control unit 7 and T.
By detecting the synchronization information (0x47) indicating the beginning of the S packet, it is determined whether the currently input selected TS packet data 22 is a 188-byte TS packet or a 4-byte null packet header information. Discriminate,
If the null packet header information is determined, the null packet control signal 24 input to the memory control unit 10 is set to the inactive state.

In this way, by controlling the memory read time of the null packet data of the memory 8 by the memory control unit 10, the synchronization detection unit 9 detects the TS packet data 22 and then performs TS packet data in 188-byte units. It can be reproduced as data 12b.

Next, the synchronization detector 9 will be described in more detail with reference to the block diagram of the synchronization detector 9 shown in FIG. In the synchronization detection unit 9, the selected TS packet data 2 input from the memory unit 8 in 1-byte units in synchronization with the clock.
4 bytes null packet information is extracted from 2, and 184
In order to restore the 188-byte TS packet to which the byte stuffing information is added, the 188-byte and 4-byte packet boundaries are detected. In addition, the currently input TS packet is the TS storing the selection program.
Determine if it is a packet or a null packet.

First, the synchronization detection unit 9 latches the selected TS packet data 22 input from the memory unit 8 in units of 3 bytes in synchronization with the clock in the cascaded 8-bit latch circuits 29b, 29c and 29d. .
Next, in the 8-bit comparator 39, the 8-bit latch circuit 2
The data held in 9d is compared with the synchronization information (0x47) of the known TS packet defined by MPEG,
When a match is detected, the pseudo sync signal 40 is activated. At the time when the pseudo sync signal 40 changes to the active state, the 8-bit latch circuit 29b is
The third byte from the beginning of the TS packet (Sd [7 ..
0]), that is, the lower 8 bits (Opi) of the PID information.
d [7. ． 0]), and similarly, in the 8-bit latch circuit 29c, the second byte (Sdq [7..0]) from the beginning of the TS packet, that is, the upper 5 bits (Sdq [4 .. 0] = Opid [12 ..
8] are retained.

However, since the same value (0x47) as the synchronization information may appear in the TS packet data other than the synchronization information, it is currently input at the time when the pseudo synchronization signal 40 changes to the active state. The PID value of the TS packet being detected is detected to improve the accuracy of synchronization detection.

Subsequently, 8-bit latch circuits 29b and 2
The PID information (Opid [7..0] and Opid [12.8]) held in 9c is concatenated as 13-bit PID information and input to the comparators 42 _{1 to} 42 _{n + 2} . Further, the PID register unit 38 has a 13-bit width P
There are n ID registers, and the selected PID data 25 is set to the PID register by the program reproduction controller 7. As a result, the PID setting data 43 can be read from the n PID registers forming the PID register unit 38.
(OPR1 [12.0] to OPRn [12.0])
Are output in a one-to-one correspondence.

The 13-bit comparator 42 ₁ is connected to the connected P
ID information (PID [12.0]), that is, the PID information of the currently input TS packet and the PID information (0x1FFF) indicating the null packet are compared, and the currently input TS packet is the null packet. Or not. When both inputs match, the 13-bit comparator 42 ₁ determines that the currently input TS packet is a null packet, and sets the null packet control signal 24 to be output to the active state.

Further, the 13-bit comparator 42 ₂ compares the PID information of the currently input TS packet with the PID number (0) indicating the PAT, and if they match, the 13-bit comparator 42 ₂ is currently input. TS packet is PAT
It is determined that the TS packet including the is a PAT, and a signal indicating the active state is output. Similarly, the n pieces of 13-bit comparators 42 _{3 to} 42 _{n + 2} are individually input to the PID setting data 43 (OPR1 [12.0 ...] to OPRn [1].
2. ． 0]) and the PID information of the currently input TS packet that is commonly input are compared, and if they match, the currently input TS packet is set in the PID register unit 38. The PID information stored therein, that is, the TS packet storing the selection program is determined, and a signal indicating the active state is output to the synchronization signal generation unit 41.

The synchronization signal generator 41 receives as input all output signals of the 13-bit comparators 42 _{2 to} 42 _{n + 2} including the null packet control signal 24 extracted from the comparator 42 ₁ , and outputs these signals. When any one of the above is detected to be in the active state, the synchronization signal 11b indicating the active state having a width of one clock is generated and output.
This synchronization signal 11b indicates a 188-byte packet or a 4-byte null packet boundary.

The selected TS packet data 22 output from the 8-bit latch circuit 29d is an n-byte clock in the delay processing unit 56 with respect to the delay amount generated when the synchronization signal generation unit 41 generates the synchronization signal 11b. The data delay adjustment is performed for a minute, and the output time is matched with the active time period of the synchronization signal 11b, that is, the synchronization information period of the currently input TS packet, and output as the TS packet data 12b.

In this way, at the time when the pseudo sync signal 40 changes to the active state, the PID register unit 38
By comparing all the PID information of the TS packet storing the selection program set to the PID information detected from the currently input TS packet, the synchronization signal 11b and the null packet control signal 24 are generated. When the synchronization signal 11b is in the active state and the null packet control signal 24 is in the inactive state, the currently input TS packet is the TS packet storing the selection program of 188 bytes, and the synchronization signal 11b
Is active and the null packet control signal 24
Is also active, the currently input T
It can be detected that the S packet is a 4-byte null packet.

As described above, in the packet conversion processing system according to the first embodiment of the present invention, when one or more programs are selected and recorded from a TS packet in which a plurality of programs are multiplexed, the selection is performed. The PID information of the TS packet storing the program and the T currently input
When the non-selected packet is detected by comparing with the PID information of the S packet, the detected non-selected packet is converted into a null packet, and the payload information of the converted null packet is deleted, thereby recording the amount of information to be recorded. Can be reduced.

When the TS packet storing the selection program is reproduced, the P packet added to the TS packet data is reproduced.
The PID information stored in the ID information table and the PID information of the currently input TS packet are compared with the synchronization detection time of the TS packet, and when a null packet is detected, the memory that stores the TS packet data. By controlling the read time of the unit 8, the payload information of the reproduced null packet can be restored.

Next, a second embodiment of the packet conversion processing system of the present invention will be described with reference to the drawings.

FIG. 6 is a system configuration diagram of the second embodiment of the packet conversion processing system of the present invention, and FIG. 7 is P of FIG.
The block diagram of an example of the ID detection part 57 is shown. 6, the same components as those in FIG. 1 are designated by the same reference numerals. In the packet conversion processing system according to the second embodiment of the present invention, as shown in FIG.
, Null packet generator 4, delay processor 5, and PAT
It is composed of a generation unit 45, a program control unit 56, a PID detection unit 57, and a packet selection unit 58, and the reproduction side has a program reproduction control unit 7, a memory unit 8, a synchronization detection unit 9, and a memory control unit. And 10.

Further, as shown in the block diagram configuration of an example of the PID detecting section 57, an 8-bit latch circuit 29a
Bit latch circuit 30 and 13-bit latch circuit 31
, 1-bit latch circuits 32a to 32c, packet enable generator 34, and n + 1 13-bit comparators 3
5 _{1 to} 35 _{n + 1} , the PID control register unit 36, the section reference register unit 49, and the PAT enable generation unit 5
It is composed of 0 and 0.

In the first embodiment, the information amount reduction means is realized by converting the non-selected TS packet into a null packet and reducing the payload portion. However, the second embodiment Then, in addition to the above reduction processing, P
It is characterized in that it has means for reducing the amount of information in the AT table.

In a TS packet in which a plurality of programs are multiplexed, a program indicating the PID of a packet in which a stream of video, audio, additional data, etc. which compose the program is transmitted for each program number of the multiplexed programs. It includes a map table (hereinafter referred to as PMT) and a PAT indicating, for each program number, identifier information of a PMT that transmits information of a packet forming the program. According to the above recommendation, PAT and PMT are 1
It is composed of one or more sections, and one section can be composed of one or more TS packets.

Therefore, T in which a plurality of programs are multiplexed
PM that does not correspond to the selected program when recording and reproducing by selecting one or more programs from the S packet
By reducing the information about T from PAT,
It is possible to reduce the number of sections forming T and the number of TS packets.

Next, the operation of the second embodiment of the packet conversion processing system of the present invention will be described with reference to FIGS. 6 and 7. In FIG. 6, when selecting and recording one or more programs from a TS packet in which a plurality of programs are multiplexed, the program control unit 56 causes the program unique information (P
The PID information of the TS packet storing the selection program is extracted from the SI) table and the program sequence information (SI) table transmitted by various digital broadcasting, and PI
Generate a D information table. This PID information table is added to the head of the selected TS packet data of the PID table data 13a by the recording processing in the recording / reproducing processing unit B, and is recorded with the same data structure as the recording data shown in FIG.

Further, the program control unit 56 acquires one or more section information constituting the PAT multiplexed in the TS packet data 12a, and extracts only the information about the selected program from the acquired one or more section information. And encode as new section information, and PAT
The control data 46 is output to the PAT generator 45. In addition, the number of original sections of the obtained section and the number of packet divisions for each original section are obtained together, and information about the number of sections of the new encoded section and the number of packet divisions for each section is also provided. get. Each of these pieces of acquired information is selected PI
The D data 14 is set in the internal register of the PID detector 57.

The PID detector 57 sets all PID information in the PID information table in the internal register through the selected PID data 14, and based on the set PID information, the TS packet data 12a and TS packet to be input are set. The TS packet storing the selection program is detected from the synchronization signal 11a. If the PID detection unit 57 detects a TS packet that does not include the corresponding PID in this detection, the currently input TS packet data 1
Packet control signal 15 indicating that 2a is invalid,
The invalid packet is made active for 188 bytes.
When a TS packet in which a PAT is stored is detected in the TS packet detection, the PAT control signal 44
Is made active for 188 bytes.

As described above, regarding the configuration and operation of the PID detection unit 57 which receives the synchronization signal 11a and the TS packet 12a as input and outputs the packet control signal 15 and the PAT control signal 44, the PID detection unit 57 of FIG. A more detailed description will be given together with the block diagram. In FIG. 7, the input synchronizing signal 11a is delayed by a total of 3 clocks by three cascaded 1-bit latch circuits 32a to 32c.
It is generated as a latch enable signal 33 for obtaining PID data from the S packet data 12a.

The TS packet data 12a input in 1-byte units in synchronization with the clock is at the time when the latch enable signal 33 becomes active.
In the 8-bit latch circuit 29a, the TS packet data 1
8 bits of the 3rd byte from the beginning of 2a (TD [7 ..
0]), that is, the lower 8 bits (PID [7..0]) in the 13 bits of PID information are held. Similarly, in the 5-bit latch circuit 30, the lower 5 bits of the second byte from the head of the TS packet data 12a are held. Bits (TD [4 ..
0]), that is, the upper 5 bits (PID [1 ... 8]) in the 13 bits of PID information are held.

In the 13-bit latch circuit 31, the 8-bit latch circuit 29a and each output of the 5-bit latch circuit 30 are connected at the time of the clock next to the time when the latch enable signal 33 becomes active, and the current input is made. The TS packet is held as PID information (PID [12..0]) of the TS packet. P by the 13-bit latch circuit 31
During the holding period of the ID information, the latch enable signal 33
Until it becomes active, that is, 188 until the PID information of the TS packet to be input next is acquired.
It will be a part-time job.

On the other hand, the PID register section 36 has n 13-bit wide PID registers, and the program control section 5
The selected PID data 14 inputted from 6 is set.
In addition, the P corresponding to the n PID registers on a one-to-one basis
ID setting data 37 (PR1 [12.0] to PRn
[12. ． 0]) is output.

Further, the 13-bit comparator 35 ₁ holds the PID information of the TS packet held by the 13-bit latch circuit 31, that is, the PID indicating the PAT and the PAT indicating the PAT.
The ID number (0) is compared to determine whether the currently input TS packet is a TS packet including PAT, and P
When it is determined to be AT, a signal indicating an active state is output.

Similarly, n 13-bit comparators 35 ₂ to 35 ₂
35 _{n + 1} is the PID setting data PR1 [12. ． 0] ~
PRn [12. ． 0]) are input separately and 1
The PID information of the TS packet currently input from the 3-bit latch circuit 31 is commonly input and compared with each other, and the currently input TS packet is the PID information set in the PID register unit 36, that is, , It is determined whether the TS packet storing the selection program,
When it is determined that the TS packet stores the selection program, a signal indicating the active state is output.

Further, the section reference register section 49 is
The selected PID data 14 output from the program control unit 56 is received as an input, and the number of original sections (OS
ecNum) and the number of packet divisions for each original section (OTsNum [m] (OSecNum> OTsN
um [m] ≧ 0)) and the number of sections (SecNum)
And the number of packet divisions for each section (TsNum [m]
(SecNum> TsNum [m] ≧ 0) is set in the internal register.

The PAT enable generator 50 has a section counter (SecCnt) and a packet counter (P
ktCnt), the packet counter (PktCnt) value is incremented by 1 when the active state is detected for the signal output of the 13-bit comparator 35 ₁ . Further, at the time when the active state is detected, the section counter (SecCnt) value is within the number of sections (SecNum), and the packet counter (PktCnt) value is the current section counter (Sec).
cCnt) The number of packets in the section corresponding to the value m (T
sNum [m]), the active PAT
The control signal 44 is output, and the inactive P
The AT status signal 51 is output.

Further, the PAT enable generation unit 50 determines that the packet counter (PktCnt) value exceeds the number of packets (TsNum [n]) of the section corresponding to the current section counter (SecCnt) value n, and the packet for each original section. Number of divisions (OTsNum [n]
(OSecNum> n ≧ 0)),
At the time when the signal input from the 13-bit comparator 35 ₁ is detected to be in the active state, the PAT control signal 44 is set to the inactive state, and the PA
The T state signal 51 is activated.

Further, the PAT enable generator 50 determines that the packet counter (PktCnt) value is the packet division number (OTsNum [n] (OSe) for each original section.
cNum> n ≧ 0)), the section counter (SecCnt) value is incremented by 1, and the packet counter (PktCnt) value is cleared.

Furthermore, the PAT enable generator 50 determines that the section counter (SecCnt) value exceeds the section number (SecNum) and the original section number (O
SecNum), the PAT control signal 44 is set to the inactive state at the time when the signal input from the 13-bit comparator 35 ₁ is detected to be in the active state, and the PAT state signal is set to the PAT control signal 44. 51 is activated. Section counter (SecC
nt) value matches the original section (OSecNum), section counter (SecCnt)
Clear the value.

The packet enable generator 34 is
Each of the output signals of the 3-bit comparators 35 _{1 to} 35 _{n + 1} and the output PAT status signal 51 of the PAT enable generation unit 50 is received as an input, and all the input signals from the 13-bit comparators 35 _{1 to} 35 _{n + 1} are input. Active and PAT
When it is detected that the status signal 51 is in the active state, that is, when it is determined that it does not correspond to all the PID information of the TS packet storing the selection program including the PAT, the packet control signal 15 to be output is set to the active state. To do.

As described above, the PID detection unit 57 uses the PI
All PID information of the TS packet storing the selection program set in the D register unit 36 and the 13-bit latch circuit 31 detected from the currently input TS packet
In addition to the comparison with the PID information held in the PID information, the various information regarding the section set in the section reference register unit 49 is used, so that the packet control signal 15 for the currently input TS packet and the PAT can be obtained.
And a control signal 44. As described above, when the packet control signal 15 is in the active state, it indicates that the currently input TS packet data 12a is invalid.

Returning to FIG. 6 again, the PAT generator 45 receives the PAT input from the program controller 56.
Through the control data 46, one or more section information forming the PAT is stored in the internal memory. Also, PAT
The generator 45 receives the PAT input from the PID detector 57.
The active state of the control signal 44 is detected, and one or more section information stored in the internal memory is sequentially divided and inserted into the TS packet in ascending order of the section number.
The T packet data 47 is generated.

When the null packet generator 4 detects the active state of the packet control signal 15, the null packet generator 4 sets the PID number (0x1) indicating the null packet set in the internal register in advance.
The null packet data 19 consisting of 4 bytes of fixed null packet header information including FFF) and stuffing data of 184 bytes of payload data is output. Further, the null packet control signal 20 indicating the 4-byte period of the null packet header information is activated in the 4-byte period.

Further, since the delay processing unit 5 matches the input times of the null packet data 19 and PAT packet data 47 and the TS packet data 18 in the packet selection unit 58, the delay processing unit 5 in the PID detection unit 57 and the null packet generation unit 4 The input TS packet 12a is subjected to delay adjustment with respect to the processing delay period and the processing delay time in the PAT generator 45.

The packet selector 58 selects and outputs the null packet data 19 while the packet control signal 15 is in the active state. Similarly, the packet selector 5
8 is P while the PAT control signal 44 is in the active state.
The AT packet data 47 is selected and output. Furthermore, the packet selector 58 is configured to detect the packet control signal 15 and the PA.
While both the T control signals 44 are in the inactive state, the TS packet data 18 input from the delay processing unit 5 is selected and output.

Further, the enable generation unit 2 sets the inactive state indicating that the packet control signal 15 is the TS packet period in which the selection program is stored and the null packet control signal 20 indicating the null packet header information 4 byte period. From the active state, the TS control signal 16 that is the valid period of the selected TS packet data 17 output from the packet selector 58 is generated. As a result, the generated TS control signal 16 becomes a signal that makes the payload portion 184 bytes of the null packet inactive, and by using this signal in the recording / playback processing unit B, the selected TS packet data 17 Of these, the TS packet data storing the selection program and the 4-byte header information of the null packet data 16 are recorded and reproduced in the recording / reproducing processing unit B
It becomes possible to record in the recording medium in.

A method for selecting and reproducing one or more programs from a TS packet in which a plurality of programs are multiplexed from the recording medium recorded in the recording / reproducing processing unit B as described above is the same as the method shown in FIG. This is similar to the first embodiment. That is, in the program reproduction control unit 7 of FIG.
The start pointer added to the head of the recorded data is acquired from the recording / reproduction processing unit B, the capacity of the recorded PID table is detected from this acquired data, and the PID table data 13b is set in the internal register. Also, the selected TS packet data 21 reproduced and taken out from the recording medium by the recording / reproducing processing unit B is temporarily stored in the memory unit 8.

The synchronization detecting section 9 selects the selected TS packet data 22 read from the memory section 8, and selects PID data 25 set by the program reproduction control section 7 and T
By detecting the synchronization information (0x47) indicating the beginning of the S packet, it is determined whether the currently input selected TS packet data 22 is a 188-byte TS packet or a 4-byte null packet header information. Discriminate,
When the null packet header information is determined, the null packet control signal 24 is set to the inactive state.

The memory control unit 10 monitors the memory unit 8 so as not to underflow and overflow, and the selection T
The writing of the S packet data 21 is controlled. When an inactive state is detected for the null packet control signal 24, the memory control signal 23 stops reading the selected TS packet data 22 from the memory unit 8 at the time when the 4-byte null packet header information is read. , The memory read is stopped during the payload 184 bytes of the null packet. By controlling the memory read time of the null packet data, the synchronization detection unit 9 causes the T
After each detection process, the S packet data 22 can be reproduced as 188-byte TS packet data 12b.

As described above, according to the second embodiment of the present invention, 1 is selected from TS packets in which a plurality of programs are multiplexed.
When selecting and recording one or more programs, the PID information of the TS packet storing the selected program is compared with the PID information of the currently input TS packet, and when a non-selected packet is detected, this detection is performed. The selected non-selected packet and the information included in one or more sections constituting the PAT are reduced to only information regarding the selected program, and the reduced information is re-multiplexed into the TS packet configured in one or more sections. Then, a difference TS packet between the TS packet storing the PAT in the TS packet in which the plurality of programs are multiplexed and the TS packet to be re-multiplexed is converted into a null packet, and the converted null packet is converted into a null packet. By reducing the payload information, the amount of information recorded can be reduced.

Also, a TS storing the selection program
When the packet is reproduced, the PID information stored in the PID information table added to the TS packet data,
The currently input TS packet PID information and TS
When a null packet is detected by comparing with the packet synchronization detection time, the payload information of the reproduced null packet is restored by controlling the read time of the memory that stores the TS packet data.

[0092]

As described above, according to the present invention,
When selecting and recording and / or reproducing one or more programs from a transport stream in which a plurality of programs are multiplexed, transport stream packets (non-selected (Selection packet) is converted to a null packet, and the information of the payload part is reduced ,
Also included in one or more sections that make up the PAT
Reduce the information to only information about the selected program
Due to be recorded without changing the time management information according to the stream format and synchronization control, information
The amount of information can be significantly reduced, and the null signal can be reproduced from the reproduced signal.
Detected, the regenerated transport packet
Control the read time of the memory that stores the
As a result, the payload of the reduced null packet is reduced.
Information can be restored.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a first embodiment of a packet conversion processing system of the present invention.

FIG. 2 is a configuration diagram showing accumulated data in recording / reproducing of the first embodiment of the packet conversion processing system of the present invention.

FIG. 3 is a waveform diagram of each part of the packet conversion processing according to the first embodiment of the packet conversion processing system of the present invention.

FIG. 4 is a block diagram of an example of a PID detection unit in the first embodiment of the packet conversion processing system of the present invention.

FIG. 5 is a block diagram of an example of a synchronization detecting unit in the first embodiment of the packet conversion processing system of the present invention.

FIG. 6 is a system configuration diagram of a second embodiment of the packet conversion processing system of the present invention.

FIG. 7 is a block diagram of an example of a PID detection unit in the second embodiment of the packet conversion processing system of the present invention.

FIG. 8 is a configuration diagram of a conventional packet conversion processing system.

[Explanation of symbols]

1, 56 Program control unit 2 Enable generation unit 3, 57 PID detection unit 4 Null packet generation unit 5 Delay processing unit 6, 58 Packet selection unit 7 Program reproduction control unit 8 Memory unit 9 Synchronization detection unit 10 Memory control unit 11a, 11b Sync signal 12a, 12b TS packet data 13a, 13b PID table data 14 Selected PID data 15 Packet control signal 16 TS control signal 17 Selected TS packet data 18 TS packet data 19 Null packet data 20, 24 Null packet control signal 21, 22 Selected TS packet data 23 Memory read control signal 25 Selected PID data 26 Start pointer data 27 Selected PID data 28 Selected TS packet data 29a, 29b, 29c, 29d 8-bit latch circuit 30 5-bit latch circuit 31 13-bit latch circuits 32a, 32b, 32c 1-bit latch circuit 33 Latch enable signal 34 Packet enable generators 35 _{1 to} 35 _{n + 1} , 42 _{1 to} 42 _{n + 2} 13-bit comparators 36 and 38 PID control register unit 37, 43 PID setting data 39 8-bit comparator 40 Pseudo sync signal 41 Sync signal generation unit 44 PAT control signal 45 PAT generation unit 46 PAT control data 47 PAT packet data 49 Section reference register unit 50 PAT enable generation unit 51 PAT status signal A, B Recording / playback processing unit

Claims (5)

(57) [Claims] 1. A tiger in which a plurality of programs are multiplexed.
One or more professionals from the transport stream packet
When recording an arbitrary selected gram,
Format and time management information related to synchronization control
Without the above selectedOf the programTransports
All non-selection except stream packetsProgram tiger
SportReduce the amount of information in the payload part of the packet
And the non-selectionProgram transportPacket
The header information of the printer to a predetermined valueConversion means to Transport in which the above programs are multiplexed
Included in the stream packet, Program Associate
The one or more sections that make up the
From the information containedDelete information corresponding to non-selected programs
ExcludingOnly give information about the selected programDelete
Means and The selection obtained by the deleting means and the converting means
Transport stream packet
And the packet of the non-selected program converted into a predetermined value
Recording means for recording the header information of the Have
A packet conversion processing system characterized by the above. 2. The information is deleted by the deleting unit and the converting unit.
Due to the reduced amount of information, the selected program
Recording medium on which sport stream packets are recorded
From the transport stream of the selected program
Reproducing means for reproducing a packet and the selected program reproduced by the reproducing means
2. The reproduction processing means for detecting the header information of the predetermined value from the transport stream packet of No. 1, and restoring the reduction information of the non-selected packet based on the detected header information. Packet conversion processing system. 3. The reproduction processing means is the reproduction means.
A memory unit for temporarily recording the reproduced transport stream packet of the selected program , and reading from the memory unit based on the packet identifier information and the packet synchronization information obtained from the transport stream packet read from the memory unit. Detecting whether the current packet is the transport stream packet of the selected program or the header information of the non-selected packet with the reduced amount of information, and the header information of the non-selected packet is detected by the detection means. 3. The packet conversion processing system according to claim 2, further comprising: a memory control unit that restores the reduced payload information by controlling the time of reading the memory unit. 4. The packet identifier information of the transport stream packet of the selected program is extracted and output from the transport stream packet in which the plurality of programs are multiplexed, and the transport stream packet in which the plurality of programs is multiplexed is output. Configure the included program association table 1
Only information related to the selected program is extracted from one or more section information, PAT control data encoded as new section information is generated and output, and sections are obtained from each of the acquired section information and the encoded PAT control data. Number and the number of packet divisions for each section, and the packet identifier information output from the program control unit for each transport stream packet in the transport stream packet in which the plurality of programs are multiplexed. Based on the above, it indicates whether or not it is a selected program, and when it is a non-selected program, it generates and outputs a packet control signal in the active state for the transport stream packet period of the non-selected program,
A PID detection unit that generates and outputs a PAT control signal in an active state for a prescribed byte period of the transport stream packet when a transport stream packet in which the program association table is stored is detected from the transport stream packets; A null packet generation unit that generates and outputs a null packet when the packet control signal is in an active state, and outputs a first null packet control signal indicating whether or not the header information of the null packet, and the packet control signal. And a first null packet control signal as an input, and an output that outputs a transport stream packet control signal in the inactive state during the payload portion of the null packet output from the null packet generation unit. A generation unit, one or more section information based on the PAT control data input from the program control unit is accumulated in an internal memory, and the PAT control signal input from the PID detection unit is in an active state, PAT by dividing and inserting one or more pieces of the section information accumulated in the internal memory into a transport stream packet in a predetermined order.
A PAT generator that generates and outputs packet data; and selects and outputs the null packet while the packet control signal is in the active state, and selects the PAT packet data while the PAT control signal is in the active state. And a packet select unit for selecting and outputting a transport stream packet in which the plurality of programs are multiplexed, while the packet control signal and the PAT control signal are both inactive, and output from the packet select unit. And a recording / reproducing processing unit that records the selected transport stream packet and the packet identifier information from the program control unit on a recording medium during the active state of the transport stream packet control signal, and reproduces the recording signal. A package characterized by having Door conversion processing system. 5. A memory unit for accumulating the selected transport stream packet from the recording / reproducing processing unit, a program reproducing control unit for setting the packet identifier information from the recording / reproducing processing unit in an internal register, and the program. Based on the packet identifier information of the selected transport stream packet input from the reproduction controller, only when the selected transport stream packet read from the memory unit is null packet header information, the second inactive state is set. A synchronization detection unit that outputs a null packet control signal, and the second null packet control signal as an input. When the second null packet control signal is in the inactive state, the null header information is read from the memory unit. Read during the period corresponding to the rear payload part 5. The packet according to claim 4, further comprising: a memory control unit that controls the reading of the memory unit so as to stop the transport stream packet, and outputs the transport stream packet in a specified byte unit from the synchronization detection unit. Conversion processing system.