JP3466417B2 - Program specification information insertion method and program specification information insertion device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a program specification information insertion method and a program specification information insertion apparatus, and more particularly to an MPEG (Moving Picture Experts Group) multiplexing system specification (ITU-T H.222.0, ISO / IEC 13818). -1), and the program specification information (Program Specific Informatio) in the transport stream (hereinafter referred to as TS).
n, hereinafter referred to as PSI) and a device for inserting PSI.

[0002]

2. Description of the Related Art Conventionally, a technique standardized by the MPEG multiplexing system specification is known. And this MP
The EG multiplex system specification defines even a method of inserting PSI data in the form of TS packets.
The specific multiplexing implementation method and implementation device are not specified.

[0003]

SUMMARY OF THE INVENTION The object of the present invention is to provide a PS in a receiving TS according to the MPEG multiplexing system specification.
It is to provide a specific method and apparatus for inserting I data in the form of TS packets. Hereinafter, specific problems that occur in implementing the program specification information insertion method and the program specification information insertion device according to the above-mentioned specifications will be described.

The first problem is the insertion timing of PSI data. That is, when PSI data is inserted in the TS packet format (hereinafter referred to as PSI-TS packet insertion), if the PSI-TS packet is inserted regardless of the received TS packet amount, the PSI-TS packet is inserted. If there is a received TS packet that has to be transmitted, the received TS packet that has to be transmitted will be accumulated while the PSI-TS packet is being inserted, and the received TS that has to be transmitted.
Delay fluctuation for packets (hereinafter referred to as jitter)
Causes a problem that causes.

As a result, an apparatus that receives a TS, decodes the TS, and reproduces an image or the like causes an underflow or an overflow of the TS packet reception buffer when the received TS packet has a large jitter. This will cause the problem of being lost.

The second problem is that the program time reference value (Pro
If there is a jitter in the arrival of a TS packet containing data (gram clock reference, hereinafter referred to as PCR), the content of the PCR data and the actual arrival time do not match. That is, the decoder side reproduces the reference time for reproducing the video or the like from the PCR data and the PCR data arrival time. Therefore, if the contents of the PCR data and the actual arrival time do not match, the decoder side accurately determines the reference time. There is a problem that the time cannot be reproduced.

A first object of the present invention is to provide a PSI insertion method and a PSI insertion apparatus which solve the above-mentioned problems and can reduce the jitter generated in a received TS packet that must be transmitted. It is in.

The second object of the present invention is, in particular, PCR.
It is an object of the present invention to provide a PSI insertion method and a PSI insertion device capable of reducing the jitter generated in a TS packet containing data with the highest priority.

[0009]

In order to achieve the above-mentioned object, the present invention is, firstly, to minimize the occurrence of jitter in a received TS packet, so that each sync signal for outputting TS packet data is , The data amount of the received TS packet is monitored, the received TS packet is output when the received TS packet is present in a certain amount or more, and the received TS packet is less than the certain amount and the PSI is inserted. PSI-TS packet is inserted, the number of received TS packets is less than a certain amount, and P
A null TS packet is inserted when it is not the time to insert the SI. The null TS packet is a TS packet having a PID (Packet Identifier) value of "0x1FFF" defined by the MPEG multiplexing system specification.

Secondly, the present invention sets a time for permitting insertion of PSI data and a time for forced insertion regardless of the amount of received TS packet data, and for each synchronization signal for outputting TS packet data. , The number of received TS packets is monitored, and the number of received TS packets exceeds a certain amount and PSI
PSI-T when it is time to forcibly insert
When the S packet is inserted, the received TS packet is over a certain amount and it is not the timing for forcibly inserting the PSI, the received TS packet is output, and the received TS packet is less than the certain amount and the PSI insertion is permitted. A PSI-TS packet is inserted in a certain case, and a null TS packet is inserted when the number of received TS packets is less than a certain amount and the PSI insertion is not permitted.

Thirdly, according to the present invention, a time for permitting insertion of PSI data and a time for forcibly inserting PSI data are set, and a reception TS is output for each synchronization signal for outputting TS packet data.
The presence or absence of a packet and whether the received TS packet contains PCR data are monitored, and when there is a received TS packet, the TS packet is a TS packet containing PCR data, and it is a timing to forcibly insert PSI. A reception TS packet containing the PCR data is output as output data for the current synchronization signal, a PSI-TS packet is inserted as data to be output in the next synchronization signal, and there is a reception TS packet and the reception TS packet is PCR. If the received TS packet is a TS packet containing data and the PSI is not forcibly inserted, the received TS packet is output and the received TS packet is present.
A PSI-TS packet is inserted when the packet is a TS packet that does not include PCR data and it is the timing to forcibly insert PSI, and there is a received TS packet and the TS packet is a TS packet that does not include PCR data. If the received TS packet is not present and the PSI insertion permission state is set, the received TS packet is output when the PSI insertion timing is not present.
A feature is that an I-TS packet is inserted, and a null TS packet is inserted when there is no received TS packet and the PSI insertion is not permitted.

Fourthly, the present invention relates to a synchronizing signal generating means for outputting TS packet data, a means for holding a received TS packet and monitoring the amount of the received TS packet, a means for instructing a PSI insertion timing, and a TS. A means for selecting any of a received TS packet, a null TS packet and a PSI-TS packet as data to be output based on the presence / absence of a received TS packet and a PSI insertion timing instruction for each synchronization signal for outputting packet data; And means for outputting the selected packet data.

Fifthly, according to the present invention, synchronization signal generating means for outputting TS packet data, means for holding received TS packets and monitoring the amount of received TS packets, means for instructing PSI forced insertion, and PSI. Insertion permission instruction means, presence / absence of received TS packet for each synchronization signal for outputting TS packet data, PSI forced insertion instruction, and P
It is characterized in that it is provided with means for selecting any of a received TS packet, a null TS packet, and a PSI-TS packet as data to be output based on the SI insertion permission instruction, and means for outputting the selected packet data.

Sixth, according to the present invention, a sync signal generating means for outputting TS packet data, a means for holding a received TS packet and monitoring the presence or absence of the received TS packet, and a TS including the PCR in the received TS packet. Means for monitoring whether the packet is a packet, means for instructing forced PSI insertion, PS
Based on the means for instructing I insertion permission, the presence / absence of a received TS packet for each synchronization signal for outputting TS packet data, whether or not the TS packet includes PCR, the PSI forced insertion instruction and the PSI insertion permission instruction. Received TS packets, null TS packets, and PSI- are output as data.
It is characterized in that it comprises means for selecting any of the TS packets and means for outputting the selected packet.

In a seventh aspect of the present invention, a means for instructing forcibly inserting PSI data and a means for permitting the insertion of PSI data are a time counter and a mechanism for resetting the time counter after PSI insertion. It is characterized by having.

In the eighth aspect of the present invention, the means for instructing the forced insertion of the PSI data and the means for permitting the insertion of the PSI data are provided with a time counter and the time for each time interval designated by the user. It is characterized by having a mechanism for resetting the counter.

According to the present invention, ninthly, the means for receiving one or a plurality of TS packets, holding the received TS packets, and monitoring the presence or absence of the received TS packets determines whether or not the TS packets are present.
It is characterized by monitoring at 88 bytes or less.

In the tenth aspect of the present invention, the means for holding the PSI data is changed because the contents of the receiving surface and the insertion surface holding the PSI data being inserted are changed.
It has a PSI data holding area on two sides with an update side for holding I data, updates the new PSI data that was changed while outputting the PSI data on the insertion side, and updates the new PSI data. Is completed, the update plane is changed to a new insertion plane, and PSI data is sequentially inserted.

The eleventh aspect of the present invention is to hold PSI data in the form of TS packets in the form of TS packets, with the insertion index attached to each TS packet data, and perform PSI data insertion based on the insertion index. Characterize.

The twelfth aspect of the present invention is to use P in TS packet format.
It has a means for updating the cyclic counter of the TS packet at the time of inserting SI data, holds the PSI data in the form of a TS packet, with the insertion index attached to each TS packet data, and based on the insertion index. PS
It is characterized by further comprising means for performing I data insertion, setting an index for updating a cyclic counter in the insertion index, and updating the cyclic counter for PSI data based on the index for updating the cyclic counter.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a PSI insertion method and device according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a PS according to the first embodiment of the present invention.
FIG. 2 is a block diagram showing the configuration of the I insertion device, FIG. 2 is a flowchart illustrating the control operation of the PSI insertion control unit of the PSI insertion device according to the first embodiment of the present invention, and FIG. 3 is the PSI insertion permission time and the PSI forced insertion time. FIG. 3 is a diagram for explaining the relationship between PSI and PSI insertion timing. In FIG. 1, 1 is F
IFO (First In First Out Memory), 2 is a PSI insertion control unit, 3 is a counter unit, 4 is a PSI memory, 5 is a null TS packet insertion unit, 7 is an input means, and 8 is a synchronization signal generation unit. P according to the first embodiment of the present invention shown in FIG.
The SI insertion device determines the data amount of the received TS packet and PS
This is an embodiment in which any one of the received TS packet, the null TS packet, and the PSI-TS packet is selected and output based on the I forced insertion instruction and the PSI insertion permission instruction.

The PSI insertion device according to the first embodiment of the present invention shown in FIG. 1 includes a FIFO 1 and a PSI insertion control unit 2.
A counter section 3 for issuing a PSI forced insertion instruction and a PSI insertion permission instruction, a PSI memory 4 for accumulating PSI data, a null TS packet insertion section 5 for holding a null TS packet and performing an insertion operation, Selector 6 and P
It is composed of input means 7 for updating SI data, setting PSI insertion permission time and setting PSI forced insertion time, and a synchronization signal generator 8 for generating a synchronization signal for outputting a TS packet.

Next, the operation of the PSI inserting apparatus according to the first embodiment of the present invention configured as described above will be described.

The PSI insertion device shown in FIG. 1 is a device for receiving one or a plurality of TSs, multiplexing the PSI data necessary for the received TSs, and outputting the multiplexed PSI data.
Is used to write necessary PSI data in the PSI memory 4. That is, when writing data to the PSI memory 4, the input unit 7 uses the address signal 52 to specify the write destination address, and uses the data signal 53 to write necessary data to the PSI memory 4. Further, the input means 7 sets the PSI insertion permission time and the PSI forced insertion time in the counter section 3 using the signal line 50.

The FIFO 1 receives the TS packet signal 20 and outputs the TS packet signal 21 to the selector 6 in accordance with the output control signal 40 from the PSI insertion controller 2. Further, the FIFO 1 transmits to the PSI insertion control unit 2 as a data amount signal 30 whether or not a certain fixed amount of received TS packet data exists in the FIFO. The sync signal generator 8 has a counter inside and transmits a sync signal 44 for outputting a TS packet to the PSI insertion controller 2 for each 188 bytes that is the data length of the TS packet.
Also, the synchronization signal generator 8 sets the counter value for each byte to P
The byte counter value signal 45 is transmitted to the SI insertion control unit 2.

The counter unit 3 transmits a PSI insertion permission signal 31 to the PSI insertion control unit 2 when the PSI insertion permission time is reached based on the PSI insertion permission time and PSI forced insertion time setting set by the input means 7. , PSI forced insertion time is reached, the PSI forced insertion signal 32 is set to PSI.
It is transmitted to the insertion control unit 2. The PSI insertion control unit 2 receives the received T packet under the conditions of the data amount signal 30, the PSI insertion permission signal 31, and the PSI forced insertion signal 32.
Any of the S packet, the null TS packet and the PSI-TS packet is selected and output. The selection method will be described later with reference to FIG.

In the above description, for example, assume that the received TS packet is selected and output from the PSI inserting apparatus shown in FIG. In this case, the PSI insertion control unit 2 uses the TS
The reception TS packet output control signal 40 is transmitted to the FIFO 1 based on the synchronization signal 44 for outputting the packet data and the byte counter value signal 45. FIFO1 is
Based on the received TS packet output control signal 40, the TS packet is output to the selector 6 as the TS packet signal 21. The PSI insertion control unit 2 outputs the selector control signal 43 so that the TS packet signal 21 output from the FIFO 1 becomes the TS packet signal 24 which is the final output signal of the PSI insertion device shown in FIG.
Switch.

Also, for example, from the PSI insertion device, a null T
S-packet output is selected and output. In this case, the PSI insertion control unit 2 transmits the null packet insertion control signal 42 to the null TS packet insertion unit 5 based on the synchronization signal signal 44 for outputting the TS packet data and the byte counter value signal 45. The null packet insertion unit 5 outputs the null TS packet as the null TS packet signal 22 to the selector 6 based on the null TS packet insertion control signal 42. The PSI insertion control unit 2 sets the selector control signal 43 so that the null TS packet signal 22 output from the null TS packet insertion unit 5 becomes the TS packet signal 24 which is the final output signal of the PSI insertion device shown in FIG. Is output to switch the selector 6.

Further, for example, from the PSI insertion device to the PSI
-TS packet output is selected and output.
In this case, the PSI insertion control unit 2 specifies the output address based on the synchronization signal 44 for outputting the TS packet data and the byte counter value signal 45, and outputs the output address specification signal 51 and the PSI packet insertion control signal 41.
Is transmitted to the PSI memory 4. Further, the PSI insertion control unit 2 transmits the reset signal 33 to the counter unit 3 to reset the counter after starting the transmission of the PSI packet insertion control signal 41 to the PSI memory 4. PSI memory 4
Based on the output addressing signal 51 and the PSI packet insertion control signal 41, the PSI-TS packet is PS
It is output to the selector 6 as the I-TS packet signal 23. The PSI insertion control unit 2 outputs the selector control signal 43 so that the PSI-TS packet signal 23 output from the PSI memory 4 becomes the TS packet signal 24 which is the final output signal of the PSI insertion device shown in FIG. Then, the selector 6 is switched.

Next, the data amount of the received TS packet, PS
The operation of the PSI insertion control unit 2 that selects any of the received TS packet, the null TS packet, and the PSI-TS packet based on the I forced insertion instruction and the PSI insertion permission instruction will be described with reference to the flow shown in FIG. .

(1) When the PSI insertion device shown in FIG. 1 is activated, the process starts according to the synchronization signal for outputting the TS packet data, and whether the time for forcibly inserting the PSI has been reached first. It is determined whether or not (steps 60 and 61).

(2) If it is determined in step 61 that the time for forcibly inserting PSI has been reached, PSI-T
Insert S packet, return to step 60,
Processing is started from the start in accordance with the synchronization signal (step 62).

(3) If it is determined in step 61 that the time for forcibly inserting PSI has not been reached, the reception TS
It is determined whether there is a packet and more than a certain amount of data, and if the received TS packet is more than a certain amount, the received TS packet is output, the process returns to step 60, and from the start according to the synchronization signal. The process is started (steps 63 and 64).

(4) If it is determined in step 63 that there is no received TS packet, or if there is not more than a certain amount of TS packets, it is determined whether or not the PSI insertion permission time is reached, and the PSI insertion permission time is determined. Reach PSI
-Insert the TS packet and return to the processing of step 60,
Processing is started from the start in accordance with the synchronization signal (steps 66 and 62).

(5) If it is determined in step 66 that the PSI insertion permission time has not been reached, a null TS packet is inserted, the process returns to step 60, and the process is started from the start in accordance with the synchronization signal (step 67). .

Next, the relationship between the PSI insertion permission time and the PSI forced insertion time and the PSI insertion timing will be described with reference to FIG. Hereinafter, the timing of PSI insertion will be described by taking the case where PSI data is inserted once or more per second as an example.

If you want to insert PSI more than once per second,
For example, the PSI forced insertion time is set to 1 second, and the PSI insertion permission time is set to 0.8 second to operate. As a result, PSI can be inserted once or more per second. In this case, the timer starts counting (8
After 0), the PSI insertion permission time (81) is reached 0.8 seconds later, and the PSI forced insertion time (82) is reached 1 second later.

As described with reference to FIG. 2, when the received TS packet is less than a certain amount and the PSI insertion permission time is reached, the PSI-TS packet is inserted.
The PSI insertion device shown in FIG. 1 inserts a PSI-TS packet between the PSI insertion permission time and the PSI forced insertion time, that is, at a timing when a received TS packet is less than a certain amount within the PSI insertion grace period (83). Will be done. However, when there is a certain amount of TS packets or more always received within the PSI insertion grace period, the PSI-TS packet is inserted during the PSI forced insertion time.

As described above, the insertion of the PSI-TS packet is performed by the method and timing described with reference to FIGS.

According to the first embodiment of the present invention, the reception T
Data amount of S packet, PSI forced insertion instruction and PSI
Since there is no received TS packet based on the insertion permission instruction and the PSI-TS packet is inserted at the PSI insertion permission time, it is possible to reduce the jitter generated in the received TS packet when the PSI-TS packet is inserted. The effect that it is possible can be obtained.

The first embodiment of the present invention described above is PS
Although it has been described that the counter of the counter unit 3 is reset when the I-TS packet insertion is started, the first embodiment can be modified so that the counter of the counter unit 3 is reset after the PSI-TS packet insertion. Hereinafter, this modification will be described.

FIG. 4 is a flow chart for explaining the control operation of the PSI insertion control unit of the PSI insertion device according to the modification of the first embodiment of the present invention, and FIG. 5 is a diagram for explaining the reset timing executed by the counter unit 3. Is.

The flow shown in FIG. 4 is a modification of the flow shown in FIG. 2, and the points different from FIG. 2 will be described below.

When it is judged in the step 61 for judging whether the PSI compulsory insertion time is shown in FIG. 4, it is judged that it is time to compulsorily insert the PSI, the PSI-TS packet is inserted and the PSI-TS packet is inserted. After that, the counter of the counter unit 3 is reset, the process returns to step 60, and the process is started from the start in accordance with the synchronization signal (step 68).

Further, it is judged that there is no received TS packet, or even if there is, there is not more than a certain amount, and the PSI
Step 6 of determining whether or not the insertion permission time has come
In step 6, if the PSI insertion permission time is reached, P
The SI-TS packet is inserted, the counter of the counter unit 3 is reset after the PSI-TS packet is inserted, and the process is started from the start in accordance with the synchronization signal (step 6).
9).

In the modification described above, the counter is reset after the PSI-TS packet is inserted as described above.

Next, the reset timing of the counter executed by the counter section 3 will be described with reference to FIG. In the example shown in FIG. 5, the flow of time is set to the right.

The example shown in FIG. 5 shows that the count of the counter section 3 is first started (80), and then the PSI insertion permission time (81) is reached. The PSI insertion time 1 (83) is the reception TS during the PSI insertion permission time.
When the number of packets reaches a certain amount, PSI-T
This indicates that the S packet has been inserted. Also,
The counter reset (85) indicates that the counter has been reset after the PSI-TS packet insertion (83).

Subsequently, the PSI insertion permission time (81) is re-established.
In addition, since the received TS packet has not reached a certain amount, the PSI forced insertion time (82) is reached. PSI insertion time 2 (84) is P
This indicates that the PSI-TS packet was forcibly inserted by the PSI forced insertion instruction because the received TS packet did not reach a certain amount during the SI insertion permission time. Counter reset (88) is a PSI-T
This indicates that the counter has been reset after the forced insertion of the S packet (84).

In the modification of the first embodiment of the present invention described above, the PSI-TS packet is inserted when the number of received TS packets reaches a certain amount during PSI insertion permission, and the counter unit 3 is inserted.
Is reset, and the TS received while PSI insertion is permitted
If the packets never reach a certain amount, PSI
The PSI-TS packet is inserted at the forced insertion timing to reset the counter unit 3. That is, the counter unit 3 is not limited to the PSI-T in any case.
Since the counter is reset after inserting the S packet, the interval between the counter reset interval 1 (86) and the counter reset interval 2 (87) is different.

In the modification of the first embodiment of the present invention, since the counter is reset as described above, it is possible to define the minimum interval and the maximum interval of the PSI insertion interval. Obtainable.

The above-described modification of the first embodiment of the present invention is a modification of the control of the PSI insertion control unit 2, and
-It has been described that the counter of the counter unit 3 is reset after the TS packet is inserted, but the first embodiment of the present invention can modify the counter unit 3, and in this modification, every time interval specified by the user. The counter of the counter unit 3 can be reset.

FIG. 6 is a diagram for explaining the reset timing of the counter executed by the counter unit 3 according to the modification of the first embodiment of the present invention. Hereinafter, a modification of the counter unit 3 will be described with reference to FIG. The operation of will be described. In the example shown in FIG. 6, the flow of time is set to the right.

In the example shown in FIG. 6, the count of the counter section 3 is first started (80), and then the PSI insertion permission time (81) is reached. The PSI insertion time (83) is the PSI-T because the received TS packet amount reaches a certain amount during the PSI insertion permission time.
This indicates that the S packet has been inserted. PSI
The forced insertion time (82) indicates that the counter operates even after the PSI-TS packet is inserted and the PSI forced insertion time is reached. Counter reset (85) is a PSI
After the forced insertion time, the reset time set by the user is reached and the counter is reset.

Then, the PSI insertion permission time (81) is re-established.
In addition, the PSI forced insertion time (82) is reached because the received TS packet amount has not reached a certain amount. PSI insertion time (84) is
This indicates that the PSI-TS packet was forcibly inserted by the PSI forced insertion instruction because the received TS packet amount did not fall below a certain amount during the PSI insertion permission time. Counter reset (88) is a PSI-T
After the forced insertion of the S packet (84), the reset time set by the user is reached and the counter is reset. That is, in this modification, the counter unit 3 is activated when the time set by the user is reached regardless of the PSI insertion time.
Is reset, so counter reset interval 1
(86) and the counter reset interval 2 (87) are the same.

In the above-described modification, since the counter is reset as described above, the time average P
It is possible to obtain the effect that the SI data can be evenly inserted.

Although the first embodiment of the present invention has been described as detecting the data amount of the received TS packet by a certain value, the first embodiment of the present invention has the data of the received TS packet. The amount detection can be modified to monitor one TS packet (188 bytes).

FIG. 7 is a diagram for explaining a method of monitoring the presence / absence of a received TS packet according to the modification of the first embodiment of the present invention. Hereinafter, referring to FIG. A modification in which the detection is monitored by one TS packet (188 bytes) will be described. The example shown in FIG.
This shows a situation in which the data amount in the IFO 1 is monitored by one TS packet.

In FIG. 7, the FIFO1 receives one or a plurality of TSs (TS signals 20), and the T1 is stored in the FIFO1.
The S packet 100 is held. In addition, FIFO1 is F
The amount of TS packet data in the IFO1 is monitored by one TS packet, and if there is one or more TS packets in the FIFO1, data is present, otherwise, no data is present, and PSI is inserted using the data presence / absence signal 30. It is transmitted to the control unit 2. The PSI insertion control unit 2 uses the presence / absence signal 30 of the received TS packet, the PSI insertion permission signal 31, and the PSI forced insertion signal 32 as conditions, and receives the received T packet as output data.
One of the S packet, the null TS packet and the PSI-TS packet is selected. The operation after selecting the TS packet for output is the same as the operation described in the first embodiment of the present invention.

It should be noted that the detection of whether or not one or more TS packet data is present in the FIFO 1 indicates that the TS packet is 1
Since it is composed of 88 bytes, data is stored in the FIFO 1 in a multiple of 188 bytes. Therefore, detection may be performed depending on whether the data is 188 bytes or less.

As described above, when the amount of data in the FIFO 1 is monitored by the size of one TS packet, that TS packet is output when at least one TS packet is present as data in the FIFO 1. Therefore, it is possible to obtain the effect that a large amount of data does not remain in the FIFO 1 when the operation is stopped.

Next, the PSI data holding format and insertion method in the above-described first embodiment of the present invention will be described.

FIG. 8 shows the PS in the PSI data storage unit 4.
FIG. 9 is a diagram for explaining management of I data, and FIG. 9 is a diagram for more specifically explaining management of PSI data in the PSI data storage unit 4. Hereinafter, referring to FIG. 8 and FIG. The insertion method will be described.

PSI memory 4 for holding PSI data
Is configured by using, for example, Dual Port RAM, and the input PSI data signal 53 is generated by the input addressing signal 52.
, And outputs the output PSI-TS packet signal 23. The PSI data holding format shown in FIG.
The PSI that has been changed because the plane that holds the PSI data currently being inserted (PSI data A side) and the received TS change
P on two sides with the side that holds data (PSI data B side)
The PSI data having the SI data holding area and held on the insertion surface of the PSI data A surface is output, and new PSI data changed during that time is updated on the update surface of the PSI data B surface.

When the update of the new PSI data is completed on the update surface of the PSI data B side, as shown in FIG. 8B, the update surface is changed to a new insertion surface, and P
PSI data is inserted using the SI data B side as the insertion side. Further, at this time, the PSI data A surface shown in FIG. 8B is changed to a new update surface, and becomes a surface for updating the updated PSI data while the PSI data B surface is inserting the PSI data.

As described above, by managing the PSI data by using the area of the two planes, the insertion plane and the update plane, it is possible to update the new PSI data even during the PSI data insertion. The effect of becoming can be obtained. By the way, when PSI is inserted by using one surface having the same insertion surface and update surface, new PSI data changed during PSI data insertion cannot be updated.

Next, in the above, the PSI data is a program table (Program Association Table, hereinafter referred to as PAT) and n program correspondence tables (Program Map Table, hereinafter referred to as PMT).
The PSI data holding format and PSI insertion method will be specifically described with reference to FIG.

FIG. 9 shows the PSI memory 4 described with reference to FIG.
The PSI data storage format on the insertion surface or the update surface of is shown in more detail. In FIG. 9, 120 is PA
T data, 121 to 124 each data of PMT (1) to PMT (n), 110 an insertion index for PAT, 111 to 114
Is an insertion index for PMT (1) to PMT (n), and 115 is PM
It is an insertion index for indicating that there is no PSI data next to T (n).

PAT and PMT (1) to PSI memory 4
When accumulating PMT (n), for example, 1-byte insertion index data is added to the head of each of PAT and PMT (1) to PMT (n), and as shown in FIG. ) Are sequentially stored as PSI data. Also, an insertion index 115 for indicating that the PSI data does not continue is added to the end of the PSI data. The 1-byte data that is the insertion index is written with "1" when there is data [PAT or PMT (1) to PMT (n)] after the insertion index, and is written with "0" when there is no data. .

As a result, PSI data can be inserted based on the value of the insertion index. That is,
As for the insertion index, the insertion index before PAT and PMT (1) to PMT (n) is checked, and if the value is "1", data [PAT or PMT (1) to PMT] is inserted after the insertion index.
(n)] is inserted, and if it is “0”, there is no data [PAT or PMT (1) to PMT (n)] after the insertion index, so the insertion operation is not performed and the check returns to the first insertion index 110 and starts checking. And PSI data [PAT and PMT (1) ~
PMT (n)] insertion and so on.

In the above description, the insertion index is 1 byte, and the value of the insertion index is "1" when there is data after the insertion index, and "0" when there is no data.
The value of the insertion index is arbitrary, and other values may be used.

As described above, by inserting PSI data based on the insertion index, it is possible to perform the insertion operation without counting the presence or absence of PAT data and the number of PMTs.

In the above description, the insertion index is added to each of the PAT and PMT to indicate whether or not there is data after the insertion index. However, a cyclic counter update index is provided in the insertion index to provide PSI data. Can also be managed.

FIG. 10 is a diagram for explaining an example of managing the PSI data by providing a cyclic counter update index in the insertion index. Hereinafter, a method of updating the cyclic counter value will be described with reference to FIG. . In FIG. 10, 120-1
24 is PSI data [PAT and PMT (1) to PMT
(n)] 110 to 115 are insertion indexes for PSI data,
Reference numeral 130 is a PSI data presence / absence index, and 131 is a cyclic counter updating index.

Insertion indices 110-115 for PSI data
Is composed of a PSI data presence / absence index 130 and a cyclic counter updating index 131, and here, for example, the PSI data presence / absence index 130 in the insertion indices 110 to 115.
It is assumed that a 1-bit area is used as the area of 7 and an 7-bit area is used as the area of the cyclic counter update index 131 for updating the cyclic counter. The method of using the PSI data presence / absence index 130, which is a 1-bit index, is the same as the PS described in FIG.
Similar to the case of the I data holding format and the PSI insertion method, the PSI data presence / absence index 130 indicates that when the PSI data presence / absence index is “1”, the PSI data presence / absence index is followed by PS.
When there is I data and the PSI data presence / absence index is “0”, it is used as an index for inserting the PSI data assuming that there is no PSI data after the PSI data presence / absence index.

The cyclic counter update index 131 is, for example,
When the value is "1", the cyclic counter value for PAT is updated, when it is "2", the cyclic counter value of PMT (1) is updated, and when it is "n + 1", the cyclic counter value of PMT (n) is updated. Further, when it is “0”, it is set that the cyclic counter is not updated, and it is used as an index for updating the cyclic counter value of the PSI data.

As described above, by providing the cyclic counter update index in the insertion index to manage the PSI data, the PSI data can be inserted based on the PSI data presence / absence index, and the cyclic counter can be inserted. The cyclic counter value can be updated based on the index for updating. As a result, it is possible to obtain the effect that PSI data can be inserted while updating the cyclic counter value without counting the number of PAT and PMT (1) to PMT (n) data.

FIG. 11 shows P according to the second embodiment of the present invention.
FIG. 12 is a block diagram showing the configuration of the SI insertion device, and FIG. 12 is a flowchart illustrating the control operation of the PSI insertion control unit of the PSI insertion device according to the second embodiment of the present invention. Figure 1
The reference numeral in 1 is the same as in FIG.

The PSI inserting apparatus according to the second embodiment of the present invention shown in FIG. 11 uses the received TS packet, the null TS packet and the PS based on the data amount of the received TS packet.
It selects and outputs any of the I-TS packets, and basically has the same configuration as that of the first embodiment shown in FIG. The difference from the first embodiment is that the reception TS
The control is to select any one of a received TS packet, a null TS packet, and a PSI-TS packet as the data to be output based on the data amount of the packet and the PSI insertion timing instruction, and other processing operation is the first embodiment. Is the same as. Hereinafter, the points different from the first embodiment will be mainly described.

In FIG. 11, the input means 7 starts with P
The PSI data is stored in the SI memory 4. In addition, the input means 7 sets the PSI insertion timing time in the counter section 3 using the signal line 50. The FIFO 1 receives the TS signal 20, and outputs the TS packet signal 21 to the selector 6 according to the output control signal 40 from the PSI insertion control unit 2. Further, the FIFO 1 transmits to the PSI insertion control unit 2 as a data amount signal 30 whether or not the received TS packet data has a certain amount of data or more. The sync signal generator 8 has a counter inside and transmits a sync signal 44 for outputting a TS packet to the PSI insertion controller 2 for each 188 bytes that is the data length of the TS packet. Further, the synchronization signal generator 8 transmits the counter value for each byte to the PSI insertion controller 2 as a byte counter value signal 45.

The counter section 3 determines the PS based on the PSI insertion timing time setting set by the input means 7.
When the I insertion timing time is reached, the PSI insertion timing signal 34 is transmitted to the PSI insertion control unit 2. The PSI insertion control unit 2 sets a reception TS packet, a null TS packet, and a PTS for each synchronization signal 44 on condition that the data amount signal 30 of the reception TS packet and the PSI insertion timing signal 34 are conditions.
One of the SI-TS packets is selected and output. The operation after selecting the output data is the same as that in the first embodiment.

Next, the data amount of the received TS packet, PS
The operation of the PSI insertion control unit 2 that selects one of the received TS packet, the null TS packet, and the PSI-TS packet based on the I insertion timing will be described with reference to the flow shown in FIG.

(1) When the PSI insertion device shown in FIG. 11 is activated, processing is started in accordance with a synchronization signal for outputting TS packet data, and there is a received TS packet at the beginning, and there is a certain amount of data or more. It is determined whether or not there is (steps 60 and 63).

(2) If there is a certain amount or more of the received TS packets in step 63, the received TS packets are output, the process returns to step 60, and the process is started from the start according to the synchronization signal (step 64).

(3) If it is determined in step 63 that there is no received TS packet, or if there is not more than a certain amount of TS packets, it is determined whether or not it is the PSI insertion timing, and the PSI insertion timing is reached. If P
The SI-TS packet is inserted, the process returns to step 60, and the process is started from the start in accordance with the synchronization signal (steps 65 and 62).

(4) If it is determined in step 65 that the PSI insertion timing has not come, a null TS packet is inserted, the process returns to step 60, and the process is started from the start in accordance with the synchronization signal (step 67).

That is, the PSI insertion controller 2 in the second embodiment of the present invention described above receives the PSI-TS packet if the received TS packet has a data amount less than a certain amount and the PSI insertion timing time is reached. Insert and PS
If the I insertion timing has not been reached, the null TS is inserted. In addition, the PSI insertion control unit 2
Even if the PSI insertion timing time has been reached, if there are more than a certain amount of received TS packets, the received TS packets are always output, and when the received TS packets are less than a certain amount, PSI-TS It is working to insert packets.

According to the second embodiment of the present invention described above, the number of received TS packets is less than a certain amount based on the data amount of the received TS packets and the PSI insertion timing, and the PSI- Since the TS packet is inserted, it is possible to obtain the effect that it is possible to reduce the jitter generated in the received TS packet when the PSI-TS packet is inserted.

FIG. 13 shows P according to the third embodiment of the present invention.
FIG. 14 is a block diagram showing the configuration of the SI insertion device, and FIG. 14 is a flowchart illustrating the control operation of the PSI insertion control unit of the PSI insertion device according to the third embodiment of the present invention. Figure 1
In FIG. 3, 12 is a PCR detection unit, and other reference numerals are the same as those in FIG.

The PSI insertion apparatus according to the third embodiment of the present invention shown in FIG. 13 determines whether or not there is a received TS packet, whether or not the received TS packet includes PCR data, and a PSI forced insertion instruction and a PSI insertion permission instruction. Based on the received T
In this embodiment, any one of an S packet, a null TS packet and a PSI-TS packet is selected and output. The difference from the first embodiment already described is the presence or absence of a reception TS packet, whether or not the reception TS packet includes PCR data, and data to be output based on the PSI forced insertion instruction and the PSI insertion permission instruction. The control is to select any one of the received TS packet, the null TS packet, and the PSI-TS packet, and the other processing operations are the same as those in the first embodiment. In the third embodiment of the present invention shown in FIG. 13, the PCR detection unit 12 is provided after the FIFO 1, and the PCR detection unit 12 and the PSI insertion control unit 2 are provided.
The configuration is different from that of the first embodiment of the present invention in that they are connected to each other. Hereinafter, the points different from the first embodiment will be mainly described.

In FIG. 13, the input means 7 starts with P
The PSI data is stored in the SI memory 4. In addition, the input means 7 sets the PSI insertion permission time and the PSI forced insertion time in the counter unit 3 using the signal line 50. FIF
The O1 receives the TS packet signal 20 and transmits the presence / absence of the received TS packet data to the PCR detection unit 12 as a data amount signal 35. Upon receiving the data amount signal 35 from the FIFO 1 and recognizing that there is a received TS packet in the FIFO 1, the PCR detection unit 12 transmits a read signal 46 to the FIFO 1. FIFO1 has a read signal 46
Then, only one TS packet of the TS packets received according to the above is output to the PCR detection unit 12.

The PCR detector 12 receives the received TS packet signal 25 output from the FIFO 1. Also, P
The CR detection unit 12 determines whether or not PCR data is present in the received TS packet, and the PSI insertion control unit 2 receives the received T packet.
Whether or not the S packet exists is transmitted to the PSI insertion controller 2 as a data amount signal 36, and whether or not the PCR data is present in the received TS packet is transmitted as a PCR flag signal 37. The sync signal generator 8 has a counter inside and transmits a sync signal 44 for outputting a TS packet to the PSI insertion controller 2 for each 188 bytes that is the data length of the TS packet. Further, the synchronization signal generator 8 transmits the counter value for each byte to the PSI insertion controller 2 as a byte counter value signal 45.

The counter unit 3 transmits the PSI insertion permission signal 31 to the PSI insertion control unit 2 when the PSI insertion permission time is reached based on the settings of the PSI insertion permission time and the PSI forced insertion time set by the input means 7. And then PSI
When the forced insertion time is reached, the PSI forced insertion signal 32 is set to PS
It is transmitted to the I insertion control unit 2. The PSI insertion control unit 2 receives the presence / absence signal 36 of the received TS packet and the PCR flag signal 3
7, the PSI insertion permission signal 31 and the PSI forced insertion signal 32 are used as conditions for outputting the received TS packet, the null TS packet, and the P in the PCR detection unit 12.
Select one of the SI-TS packets. The processing operation after selecting the output data is the same as that in the first embodiment.

Next, based on the presence / absence of a received TS packet in the PCR detection unit, whether or not the received TS packet includes PCR data, and the PSI forced insertion instruction and the PSI insertion permission instruction, PCR detection is performed as final output TS packet data. Internal TS packet, null TS packet and PS
The operation of the PSI insertion control unit 2 that selects any of the I-TS packets will be described with reference to the flow shown in FIG.

(1) When the PSI insertion device shown in FIG. 13 is activated, processing is started in accordance with a synchronization signal for outputting TS packet data, and the presence / absence of a received TS packet in the PCR detection section is first detected. If there is a received TS packet, it is subsequently determined whether or not the received TS packet has PCR data (steps 60, 63, 6).
8).

(2) If it is determined in step 68 that the received TS packet has PCR data, then it is determined whether or not the PSI forced insertion time has come. If the forced insertion time has come, the PCR data Output a certain received TS packet first, and then PSI-T at the next synchronization signal timing.
The S packet is inserted, the process returns to step 60, and the process from the start is started according to the synchronization signal (steps 61, 64, 62).

(3) If it is determined in step 61 that the forced insertion time is not reached, the TS packet having the received PCR data is output, the process returns to step 60, and the process from the start is performed according to the synchronization signal. Start (step 64).

(4) PCR in the judgment at step 68
If it is determined that there is no data, it is determined whether or not it is the PSI forced insertion time, and if it is the PSI forced insertion time, a PSI-TS packet is inserted, and the process returns to step 60, Processing from the start is started according to the synchronization signal (steps 61 and 62).

(5) If it is determined in step 61 that it is not the PSI forced insertion time, the received TS packet is output, the process returns to step 60, and the process from the start is started according to the synchronization signal (step 64). ).

(6) Receive T in the judgment of step 63
If it is determined that S does not exist, it is determined whether or not the PSI insertion permission time is reached, and if the PSI insertion permission time is reached, the PSI-TS packet is inserted, and step 60
Then, the process from the start is started according to the sync signal (steps 66 and 62).

(7) If it is determined in step 66 that the PSI insertion permission time has not come, a null TS packet is inserted, the process returns to step 60, and the process from the start is started according to the synchronization signal (step). 67).

As described above, when the PSI inserting apparatus according to the third embodiment of the present invention has the received TS packet and the received TS packet includes the PCR data, the received TS packet is received. It outputs the highest priority, and then operates to insert the PSI-TS packet. If the PCR data is not included, PSI
If the PSI-TS packet is inserted at the forced insertion time,
If it is not the PSI forced insertion time, it operates so as to output the received TS packet. Furthermore, if there is no received TS,
When the PSI insertion permission time is reached, a PSI-TS packet is inserted, and when the PSI insertion permission time is not reached, a null TS packet is inserted.

According to the third embodiment of the present invention, which operates as described above, the presence / absence of a received TS packet and its received T
Whether or not the S packet includes PCR data, based on the PSI forced insertion instruction and the PSI insertion permission instruction, if the reception TS packet has PCR data, the reception TS packet is output with the highest priority, and then the PSI is output. -Since the TS packet is inserted, it is possible to reduce the jitter generated in the received TS packet including the PCR data at the time of inserting the PSI-TS packet with the highest priority.

[0105]

As described above, the PS according to the present invention
According to the I insertion method and the PSI insertion device, the following effects can be obtained.

(1) Since the PSI-TS packet is inserted by detecting the data amount of the received TS packet, P
It is possible to obtain the effect that it is possible to reduce the jitter that occurs in the received TS packet when the SI-TS packet is inserted.

(2) Not only the presence / absence of the received TS packet but also the presence of PCR data in the received TS packet is monitored, and the TS packet containing the PCR data is output with the highest priority to output the PSI-TS packet. I will insert it, so P
It is possible to obtain the effect that the jitter generated in the TS packet including the PCR data at the time of inserting the SI-TS packet can be reduced with the highest priority.

(3) It is possible to reset the counter after inserting the PSI data.
It is possible to obtain the effect that the minimum interval and the maximum interval characteristic of the I insertion interval can be defined.

(4) The counter can be reset in accordance with the interval designated by the user, whereby the effect that the PSI data can be evenly inserted on a time average basis can be obtained.

(5) By monitoring the received TS packet amount with one TS packet, it is possible to obtain the effect that a large amount of data does not remain in the FIFO when the operation of the PSI inserting apparatus according to the present invention is stopped. it can.

(6) The PSI data is inserted by managing the PSI data by using the memories of two sides, the insertion side and the update side, so that the new PSI is inserted even during the PSI data insertion.
It is possible to obtain the effect that the data can be updated.

(7) P based on the PSI data insertion index
It is possible to insert SI data, which makes it possible to obtain the effect that the PSI data insertion operation can be performed without counting the presence or absence of PAT data and the number of PMTs.

(8) The cyclic counter can be updated based on the index for updating the cyclic counter, whereby the number of data of PAT and PMT (1) to PMT (n) can be counted. It is possible to obtain the effect that it becomes possible to change the cyclic counter value without the need.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a PSI insertion device according to a first embodiment of the present invention.

FIG. 2 is a flowchart illustrating a control operation of a PSI insertion control unit of the PSI insertion device according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating a relationship between a PSI insertion permission time and a PSI forced insertion time, and PSI insertion timing.

FIG. 4 is a PSI according to a modification of the first embodiment of the present invention.
It is a flowchart explaining the control operation of the PSI insertion control part of an insertion device.

FIG. 5 is a diagram illustrating reset timing executed by a counter unit.

FIG. 6 is a diagram illustrating a reset timing of a counter executed by a counter unit according to a modified example of the first embodiment of the present invention.

FIG. 7 is a reception T according to a modification of the first embodiment of the present invention.
It is a figure explaining the method of monitoring the presence or absence of an S packet.

FIG. 8 is a diagram illustrating management of PSI data in a PSI data storage unit.

FIG. 9 is a diagram for more specifically explaining management of PSI data in a PSI data storage unit.

FIG. 10 is a diagram illustrating an example of managing a PSI data by providing a cyclic counter update index in the insertion index.

FIG. 11 is a block diagram showing a configuration of a PSI insertion device according to a second embodiment of the present invention.

FIG. 12 is a flowchart illustrating a control operation of a PSI insertion control unit of the PSI insertion device according to the second embodiment of the present invention.

FIG. 13 is a block diagram showing a configuration of a PSI insertion device according to a third embodiment of the present invention.

FIG. 14 is a flowchart illustrating a control operation of a PSI insertion control unit of the PSI insertion device according to the third embodiment of the present invention.

[Explanation of symbols]

1 FIFO 2 PSI insertion controller 3 Counter section 4 memory 5 Null packet insertion part 6 selector 7 Input means 8 Sync signal generator 12 PCR detector

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuyoshi Torii 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi, Ltd. Information & Communication Division (56) Reference JP-A-9-55767 Tokushuhei 9-505433 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04J 3/00 H04N 7/08 H04N 7/081

Claims (6)

(57) [Claims] 1. One or more transport streams (hereinafter referred to as TS) are received, and program specification information (hereinafter referred to as TS) is received in the received TS according to a synchronization signal.
In the program specification information insertion method of inserting a TS packet (referred to as PSI), the received TS packet amount is monitored,
When there are more than a certain amount of received TS packets, the received TS packets are output, and when the number of received TS packets is less than a certain amount and it is time to insert PSI, PSI-TS packets are inserted and received TS packets are received. A PSI insertion method, characterized in that a null TS packet is inserted when it is less than a certain amount and it is not the timing to insert the PSI. 2. In a PSI insertion method of receiving one or a plurality of TSs and inserting PSI-TS packets into the received TSs according to a synchronization signal, the received TS packet amount is monitored and the received TS packet is constant. If there is more than a certain amount and it is the timing to forcibly insert the PSI,
When the PSI-TS packet is inserted, the reception TS packet is present in a certain amount or more and it is not the timing to forcibly insert the PSI, the reception TS packet is output and the reception T packet is received.
If the S packet is less than a certain amount and is in the PSI insertion permission state, a PSI-TS packet is inserted, and if the received TS packet is less than a certain amount and the PSI insertion is not permitted state, a null TS packet is set. A PSI insertion method characterized by inserting. 3. A PSI inserting method of receiving one or a plurality of TSs and inserting PSI-TS packets into the received TSs according to a synchronization signal, in the presence or absence of the received TS packets and the received TS packets being a program time reference. It is monitored whether or not reference value (hereinafter, referred to as PCR) data is included, and a reception TS packet exists, the reception TS packet is a TS packet including PCR data, and PSI.
If it is the timing to forcibly insert, the reception TS packet including the PCR data is output by the current synchronization signal, the PSI-TS packet is inserted by the next synchronization signal, and there is a reception TS packet and the TS If the packet is a TS packet containing PCR data and it is not the timing for forcibly inserting PSI, then the received TS packet is output, and there is a received TS packet and the received TS packet is a TS packet that does not contain PCR data. And PSI
If it is the timing to forcibly insert the PSI-T,
When an S packet is inserted, there is a received TS packet, the received TS packet is a TS packet that does not include PCR data, and it is not the timing to forcibly insert PSI, the received TS packet is output and the received TS packet is If there is none and the PSI insertion is permitted, PSI-T
S packet inserted, no TS packet received and PS
A PSI insertion method, wherein a null TS packet is inserted when the I insertion is not permitted. 4. A PSI inserting device for receiving one or a plurality of TSs and inserting PSI-TS packets in the received TSs, a means for receiving the TSs, a means for holding the received TS packets, and an amount of the received TS packets. A means for monitoring, a means for holding null TS packet data, a means for holding PSI data, a means for instructing PSI insertion timing, a means for generating a synchronization signal for outputting a TS packet, and a TS packet Means for indicating a period for outputting, a received TS packet as data to be output based on an amount of the received TS packet and a PSI insertion timing instruction,
Means for selecting either the null TS packet or the PSI-TS packet, means for outputting the selected TS packet data, means for updating the PSI insertion timing, P
A PSI insertion device comprising means for updating SI data. 5. A PSI inserting device which receives one or more TSs and inserts PSI-TS packets into the received TSs, and a means for receiving the TSs, holding the received TS packets, and determining the amount of the received TS packets. Means for monitoring, means for holding null TS packet data, means for holding PSI data, means for instructing PSI forced insertion, P
Means for instructing SI insertion permission, means for generating a synchronization signal for outputting TS packets, means for indicating a period for outputting TS packets, amount of received TS packets, PSI forced insertion instruction, and PSI insertion Received TS packet and null TS as data output based on the permission instruction
Means for selecting either packet or PSI-TS packet, means for outputting the selected TS packet data, means for updating the PSI forced insertion time, means for updating the PSI insertion permission time, and updating PSI data A PSI insertion device comprising: 6. A PSI inserting apparatus which receives one or more TSs and inserts PSI-TS packets into the received TSs, and a means for receiving the TSs, holding the received TS packets, and checking the presence or absence of the received TS packets. Means for monitoring, means for monitoring whether or not the received TS packet is a TS packet including PCR data, means for holding null TS packet data, means for holding PSI data, and means for instructing forced insertion of PSI. , PSI insertion permission means, means for generating a sync signal for outputting a TS packet, means for indicating a period for outputting a TS packet, presence / absence of a received TS packet, and the received TS packet is P
Whether to include CR data, PSI forced insertion instruction and PS
Received as data to be output based on the I insertion permission instruction
Means for selecting any of the S packet, null TS packet and PSI-TS packet, means for outputting the selected TS packet data, means for updating the PSI forced insertion time, and means for updating the PSI insertion permission time , PSI
And a means for updating data.
SI insertion device.