JP3244120B2 - Error determination 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 an information processing terminal system in multimedia communication for communicating program data and the like using a compressed moving image data format that has been subjected to inter-frame prediction coding, and more particularly to a digital information processing system using a communication network. VOD (Video On Dem) for reproducing compressed data
and) an error determination processing system in the system.

[0002]

2. Description of the Related Art Conventionally, in this type of information processing terminal system, there is a data line fault monitoring device described in Japanese Patent Application Laid-Open No. 63-250936. This is a monitoring device that detects the failure even when the phase distortion or quantization noise on the communication line is large.

In Japanese Patent Application Laid-Open No. 5-120178,
There is disclosed a message assurance method which includes a normality monitoring software unit for confirming the normality of a message transmitted and received in a processor separately from the message assurance in the transmission control procedure, and performs mutual communication between a plurality of processors.

[0004]

SUMMARY OF THE INVENTION In a communication system for transmitting and receiving digital compressed data such as MPEG data using a communication network such as a cable TV or the like, a CP
Since U does not intervene, data is transferred to C at the end of data transfer.
It is necessary to confirm the receipt to the PU side, but the problem is how to ensure the validity of the verification data for confirmation.

SUMMARY OF THE INVENTION An object of the present invention is to provide a communication system for transmitting and receiving digital compressed data such as MPEG data using a communication network such as a cable TV or the like. It is to provide a processing method.

[0006]

According to the present invention, in a data processing terminal system for reproducing digital compressed data using a communication network, a multi-processor for controlling communication of the digital compressed data in a compressed download data format is provided. Media server unit, receives the moving image data from the multimedia server unit, analyzes the digital compressed data,
The multimedia data processing unit includes a multimedia data processing unit for performing a reproduction process. The multimedia data processing unit receives digital compressed data as data in a download format transmitted from the multimedia server, and detects a header of the downloaded digital compressed data. A system processing unit, and a data verification processing unit that counts a packet header to detect the number of packet data that is a minimum transfer unit of data to be processed among the detected headers. The digital compressed data is created by dividing a menu data having a function of allowing a viewer to select a service into N pieces by determining a size having the highest transfer efficiency in a communication environment to be used and dividing the menu data into N pieces. Create data with an AP header by adding an AP header,
A verification header is added to the beginning and end of the AP header-attached data to create a verification header-attached data, and the verification header-attached data is divided into n blocks with a predetermined data length. A packet data is created by adding a header, the packet data is collected, a pack header and a system header are added at the head thereof, and an end code ID is finally added to create the pack data. The unit compares the total number of the counted packet headers with the initially set number of packet divisions, and when the numbers do not match, requests the multimedia server unit to retransmit the downloaded digitally compressed data. Is retransmitted to the multimedia data processing unit, and an error and network Error determination processing system, characterized in that can determine data reception failure due abnormalities including transmission path error in obtain.

[0007]

Further, according to the present invention, the verification processing unit verifies whether the first and last verification headers match, and verifies the data content if they match. ,
2. The error discrimination processing system according to claim 1, wherein a request for the next pack data is issued if there is no abnormality, and a retransmission request for the pack data is issued again to the multimedia server unit if they do not match. can get.

Further, according to the present invention, the AP header includes server information indicating management information of the menu data, a command number indicating a position of the divided menu data, and data of the divided menu data. An error discrimination processing system characterized by comprising a command length indicating the length is obtained.

Further, according to the present invention, the verification header is added from 1, and a sequence number that counts up by one, a data part length indicating the length of the data with the AP header, and a check of the verification header An error discrimination processing system characterized by comprising a header checksum as a sum and a data checksum as a checksum of the data with the AP header is obtained.

Further, according to the present invention, the packet header includes a synchronization code, a PES length, a flag, and a PES.
An error discrimination processing system characterized by being constituted by a header length is obtained.

[0012]

According to the present invention, the circuit for processing the compressed moving image data has means for notifying that the header of the data transfer unit has been detected, and by counting the number of times that the header has been detected, the system processing unit can detect the header. It is possible to verify missing data when an error occurs. Thus, even if the data area containing the checksum data for data verification is missing, the error can be detected.

[0013] In addition to the above-mentioned detection means, by embedding verification data for performing a sum check after transfer is completed in a plurality of locations of the compressed moving image format, it is possible to make the data less susceptible to data transmission line errors on the network. it can.

[0014]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a configuration diagram showing an embodiment of an error determination processing system according to the present invention.
The multimedia server unit 1 stores MPEG data (digitally compressed data), searches for the data, and controls communication. The terminal unit 2 receives data from the multimedia server unit 1 and reproduces the data. The data transmitted from the multimedia server 1 enters the system processing unit 9. The data verification processing unit 4 counts the number of headers based on the timing of header detection from the system processing unit 9.

The compressed moving image data is analyzed by a system processing unit 9 in the multimedia data processing unit 3 and separated into header information and video data and audio data to be reproduced. The video data is reproduced by a video decoding unit 7 while being temporarily stored in a first storage unit 8, and the audio data is reproduced by an audio decoding unit 13. In the display circuit 6 and the audio circuit 12, the display output device 5 and the audio output device 1 are respectively provided.
The data is converted into data for one and output as images and sounds to be viewed. These reproduction processing instructions are transmitted from the input / output control unit 14 to the central control unit 15 according to an input from a viewer through the external input device 18 and are performed.

The terminal unit 2 converts the digital compressed data from the multimedia server 1 into private data (download data) such as menu data or file data, which is a program of a menu screen of the terminal unit 2, for moving image reproduction. Receive using For this purpose, digital compressed data in the download data format described below is created.

The menu (file) data 20 in FIG. 2 is program data for operating a menu screen having a function of allowing a viewer to select a service in the terminal unit 2. It is assumed that the menu data 20 is determined to have a size with the highest transfer efficiency in the communication environment to be used, is divided into units, and is temporarily divided into N units. The divided menu data 19-1 of the divided first block will be described below.

First, an AP header 21 is added to the divided menu data 19-1. The AP header 21 includes server information 22 (management information of the menu data 20 in the multimedia server 1) and command number 2 as shown in FIG.
3 (information indicating the position of the divided data in the compressed menu data 20) and the command length 2
4 (the data length of the divided data).
Next, the data created as described above (AP header 2
The verification header 25 is added to the 1 + divided menu data 19-1) 26 at the beginning and end of the data 26 to create the data 31. As shown in FIG. 3B, the verification header 25 includes a sequence number (given from 1 and counts up by one) 27, a data part length (the length of the data 26 including the AP header) 28, and a header checksum. (The checksum of the verification header 25) 29 and the data checksum (the checksum of the data 26) 30.

Next, the data 31 is converted into private data as follows. That is, the data 31 is divided into n blocks with a certain data length (for example, 32 KB), and packet headers 33 are added to the divided blocks 32-1 to 32-n to create packet data 40-1 to 40-n. I do. The packet header 33 includes a synchronization code 34, a PES length 35, and a flag 36 as shown in FIG.
And a PES header length 37.

The packet data 40-1 to 40-1
40-n are collected, a pack header 38 and a system header 39 are added at the beginning, and an end code ID (end code of data) 41 is finally added to pack data 42-1.
Create The remaining divided menu data (19-2 to 19-) of the menu data 20 thus compressed
N), the same data is created, pack data (42-2 to 42-N) is created, and the download data 4
Create 3.

If the last data is not divided into N pieces of data, the packet data is added to the last divided data so that N packet headers are included in the pack data.

Next, in the software control configuration of FIG. 3, the multimedia server S / W unit 53 is a switch for controlling the multimedia server 1, and searches the multimedia server 1 for compressed moving image data. , Performs data transmission to the application S / W unit 52 and communication control. The application S / W unit 52 is a switch that controls a user interface part of the terminal unit 2, and controls communication with the multimedia server 1 and data control with the device driver S / W unit 51.

The device driver S / W unit 51 is a multimedia data processing unit 3 which is H / W in the terminal unit 2.
Is controlled by an instruction from the application S / W 52.

Next, the operation of this embodiment will be described with reference to FIG.
This will be described with reference to FIGS. First, an instruction of download preparation processing is sent from the application S / W 52 to the device driver S / W section 51 by an operation from the menu screen of the terminal section 2 by the viewer, and is sent to the multimedia data processing section 3 which is H / W. Download preparation processing is performed. In response to the response after the preparation processing, the application S / W 52 issues a download data transfer request to the multimedia server S / W unit 53. The pack data 42-1 to 42-N of the download data 43 created in FIG.
At 4, it is transmitted to the multimedia data processing unit 3. The system processing unit 9 performs a header process for removing the header 38, the system header 39, the packet header 33, the end code ID 41, and the like from the pack data transmitted to the multimedia processing unit 3 in FIG. The data 31 with the verification header 25 subjected to the header processing is stored in the first storage unit 8.

The central control unit 15 shown in FIG.
Is set in advance when the divided menu data 19-1 is divided into packet data. The data verification processing unit 4 counts the packet header 33 of FIG. 2 detected by the system processing unit 9. When the system processing unit 9 of FIG. 2 detects the end code ID 41 of FIG.
The system processing unit 9 notifies the data verification processing unit 4 of the detection. The verification processing unit 4 compares the total number of packet headers 33 counted up to that time with the initially set division number n and notifies the central control unit 15 of a response as to whether or not they match by interruption or the like. Figure 3 if not matched
Is notified to the application S / W unit 52 from the device driver S / W unit 51 of the application, and the application S / W unit 52 requests the multimedia server S / W unit 53 to retransmit the pack data. Then, the pack data is retransmitted to the terminal unit 2 in FIG. If they match, it means that the data reception from the device driver S / W unit 51 of FIG.
The W unit 52 is notified.

At this time, only the verification header 25 from which the header (pack header, system header, packet header, etc.) in the pack data has been removed by the system processing unit 9 is added to the first storage means 8 in FIG. Data 31 is stored. The application S / W unit 52 issues an instruction to write the data 31 to the device driver S / W unit 51 to the second storage unit 17 in FIG. 1, and when a write completion response is returned, the data 31 is added before and after the data 31. FIG.
Verify that the verification headers 25 of the two match. If they match, the data content is verified from the checksum data in the verification header. If an abnormality is found in this verification, a request for retransmission of pack data is issued from the application S / W unit 52 to the multimedia server S / W unit 53, and if there is no abnormality, a request for the next pack data is issued.

[0027]

According to the present invention, a circuit for processing digital compressed data has means for notifying that a header of a data transfer unit has been detected, and counts the number of times that the header has been detected. It is possible to verify missing data when the header detection is incorrect. Thus, even if the data area containing the checksum data for data verification is missing, the error can be detected.

In addition to the above-described detection means, by embedding verification data for performing a sum check after the transfer is completed in a plurality of locations of the digital compression data format, it is possible to make the data less susceptible to transmission path errors on the network. it can.

That is, it is not only effective for error analysis on a transmission path that is difficult to understand, but also for a compressed moving picture reproduction terminal in a CATV network system, which compresses data, such as program data, to which a data error during communication is not allowed. When transmitting in image format, reliability during data transfer can be ensured.

[Brief description of the drawings]

FIG. 1 is a system block diagram showing an embodiment of an error determination processing method in a digital compressed data format according to the present invention.

FIG. 2 is a diagram showing a download data format.

3A is a configuration diagram of an AP header, FIG. 3B is a configuration diagram of a verification header, and FIG. 3C is a configuration diagram of a packet header.

FIG. 4 is a sequence chart showing S / W control of a decoding method in a moving image data format.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Multimedia server 2 Terminal part 3 Multimedia data processing part 4 Data verification processing part 5 Display output device 6 Display circuit 7 Video decoding part 8 First storage means 9 System processing part 10 Bus 11 Audio output device 12 Audio circuit 13 Audio Decoding unit 14 input / output control unit 15 central control unit 16 communication processing unit 17 second storage means 18 external input device 19-1 to 19-N divided menu data 20 compressed menu data 21 AP header 22 server information 23 command number 24 Command Length 25 Verification Header 27 Sequence Number 28 Data Length 29 Header Checksum 30 Data Checksum 33 Packet Header 34 Synchronization Code 35 PES Length 36 Flag 37 PES Header Length 38 Pack Header 39 System Data 40-1 to 40-n Packet data 41 End code ID 42-1 to 42-N Pack data 43 Download data 51 Device driver S / W section 52 Application S / W section 53 Multimedia S / W section 54, 55 , 56 routes

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) H04L 1/00 G06F 13/00 H04L 12/56 300 H04L 29/00 H04N 7/24

Claims (5)

(57) [Claims] 1. An information processing terminal system for reproducing digital compressed data using a communication network, a multimedia server unit for controlling communication of the digital compressed data in a compressed download data format, and the multimedia server unit. A multimedia data processing unit for receiving the moving image data, analyzing the digitally compressed data, and performing a reproduction process. The multimedia data processing unit includes a digital data as a download format data transmitted from the multimedia server. A system processing unit that receives the compressed data and detects a header of the downloaded digital compressed data;
A data verification processing unit that counts packet headers to detect the number of packet data, which is the minimum transfer unit of data to be processed, among the detected headers, and creates digital compressed data as the download data Divides menu data having a function of allowing a viewer to select a service into N pieces by determining a size having the highest transfer efficiency in a communication environment to be used, and adding an AP header to the N pieces of menu data. To create data with an AP header, add a verification header to the beginning and end of the data with an AP header to create data with a verification header, and divide the data with the verification header into n blocks with a predetermined data length. Then, packet data is created by adding a packet header to each of the divided blocks, and the packet data is collected and packed at the beginning of the packet data. Data and a system header, and finally, an end code ID is added to create pack data. The verification processing unit compares the total number of the counted packet headers with the initially set number of packet divisions. do it,
If not, request the multimedia server unit to retransmit the downloaded digital compressed data,
An error discrimination processing system, wherein digital compressed data is retransmitted to the multimedia data processing unit, and data reception failure due to an abnormality occurring inside the client terminal and an abnormality including a transmission path error on a network can be determined. 2. The verification processing section verifies whether or not the first and last verification headers match. If they match, the data content is verified. If there is no abnormality, the next pack data is verified. 2. The error discrimination processing system according to claim 1, wherein a request is issued, and if they do not match, a request for retransmission of the pack data is issued to the multimedia server unit again. 3. The AP header includes server information indicating management information of the menu data, a command number indicating a position of the divided menu data, and a command length indicating a data length of the divided menu data. The error determination processing system according to claim 1, wherein the error determination processing system is configured. 4. The method according to claim 1, wherein the verification header is assigned from 1
A sequence number that counts up by
It is characterized by comprising a data portion length indicating the length of data with a P header, a header checksum as a checksum of the verification header, and a data checksum as a checksum of the data with the AP header. The error determination processing system according to claim 1. 5. The packet header includes: a synchronization code;
5. The error determination processing system according to claim 1, comprising a PES length, a flag, and a PES header length.