JPH10173724A - Multimedia traffic controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the technology of data transfer by which data are efficiently transferred, in response to the contents of the transferred data. SOLUTION: This multimedia traffic controller that controls traffic of multimedia data transfer via a transmission medium is provided with attribute information read means 114, 117 that read attribute information denoting whether or not an information error or missing is detrimental to communication information from transferred data and with reliability adjustment means 112, 119 that set reliability of transferred data, depending on the attribute information read by the attribute information read means 114, 117.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multimedia traffic control apparatus for controlling traffic for transferring multimedia data, and more particularly to multimedia data of video or audio or a high-efficiency code of the multimedia data. The present invention relates to a technology that is effective when applied to a multimedia traffic control device that performs information communication after the conversion.

[0002]

2. Description of the Related Art Conventionally, a multimedia traffic control device for controlling traffic for transferring multimedia data is connected via a transmission medium, and a plurality of multimedia traffic control devices are used to control video and audio multimedia data. Information communication after high-efficiency encoding of data or the multimedia data is performed.

[0003] MPEG which is multimedia data
(Moving Picture Experts G
For information on the interface of an information processing apparatus for exchanging moving image data compressed by the
1394 enables transfer of multiple MPEG data, Nikkei Electronics, 1996.1.29 (No.654)
p. 113-120 ".

[0004] The outline is As used for normal data transfer.
It is provided with an asynchronous transfer mode and an isochronous transfer mode in which a plurality of transmission sources separately transfer multimedia data such as video data and audio data to a plurality of transmission destinations using different virtual channels.

[0005] In addition, a database of information in the region and in the company is provided, and ISDN (Integrated Service) is provided.
For a next-generation private digital videotex system that provides multimedia information including natural images and audio using a ce Digital Network (CE Digital Network) line, see "Technical Description: Image Information Providing System Using ISDN, Journal of Image Electronics Society, Volume 19, Issue 2 (19
90), p. 58-65 ".

[0006] The outline is an information center for storing, managing and transferring image information, a user terminal for displaying provided information,
It consists of an information input device that creates and edits information.
It is connected via the basic interface of SDN.

[0007]

The present inventor has found the following problems as a result of studying the above prior art.

That is, in the conventional traffic control apparatus for transmitting and receiving various data including the multimedia data, the transfer is set by setting the reliability of the transfer independently of the attribute of the data to be transferred. Transfer of data with high reliability increases processing load,
Transferring with low reliability causes a problem that necessary data is lost and transfer efficiency is reduced.

In addition, since multimedia data transferred in the conventional multimedia traffic control device requires near real-time transfer, if an error occurs in the transferred data, the error data is transferred. There is a problem in that retransmission is not able to satisfy the above-described transfer request near real time.

An object of the present invention is to provide a technique capable of efficiently performing transfer according to the content of data to be transferred.

Another object of the present invention is to provide a technique capable of efficiently transferring data for which attribute information is not set according to the content.

Another object of the present invention is to provide a technique capable of minimizing data loss due to unauthorized data.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0014]

SUMMARY OF THE INVENTION Among the inventions disclosed by the present application, the outline of a representative one will be briefly described.
It is as follows.

(1) Multimedia via a transmission medium
In a multimedia traffic control device for controlling traffic for transferring data, an attribute information indicating whether an information error or omission is fatal to communication information is read, and transfer reliability is set according to the read attribute information. Is what you do.

In the multimedia traffic control apparatus, attribute information indicating whether an information error or omission is fatal to communication information is stored in advance in the data to be transferred.

The stored attribute information is information indicating whether an information error or omission is allowable for the communication information.

For example, in the case of a program or data, compressed data or encrypted data, a 1-bit information error or loss is not allowed, but in audio data or moving image data, a 1-bit information error or loss is not allowed. , Does not affect much during playback.

Therefore, in this case, information for identifying a program, data, compressed data, or encrypted data from audio data or moving image data is set as the attribute information.

The attribute information reading means of the multimedia traffic control device reads the attribute information from the data to be transferred, passes the read attribute information to the reliability adjusting means, and the reliability adjusting means reads the attribute information. The reliability of the data to be transferred is set according to the attribute information read by the means, and the data is transferred to the destination.

For example, as described above, when information for identifying a program, data, compressed data, or encrypted data and audio data or moving image data is set as attribute information, the attribute information reading means may be used. In the case where attribute information indicating a program, data, compressed data, or encrypted data is read from the data to be transferred, the reliability adjustment means determines that the information is data that does not allow information errors or omissions. If the attribute information reading means reads the attribute information indicating the audio data or the moving image data from the data to be transferred, the reliability adjusting means sets the information in which data errors or omissions are allowed. Set reliability as there is.

That is, when transferring the program, the data, the compressed data, or the encrypted data, the reliability adjusting means performs a parity check or a CRC (C
The reliability is set to perform error control such as cycling (cyclic redundancy check), and the reliability is set to not perform error control when transferring audio data or moving image data.

Alternatively, the reliability adjusting means may detect and correct information errors and omissions when transferring a program, data, compressed data, or encrypted data. Set the reliability as the one that performs the control, and set the reliability as the relatively low-reliability error control that only detects information errors and omissions when transferring audio data and video data. You may.

As described above, according to the multimedia traffic control apparatus, the transfer reliability is set by reading the attribute information indicating whether the information error or omission is fatal to the communication information. It is possible to transfer data efficiently according to the content of data.

(2) Multimedia via a transmission medium
In a multimedia traffic control device for controlling traffic for transferring data, attribute information indicating whether an information error or omission is fatal to communication information is measured from the transferred data, and transferred according to the measured attribute information. This sets the reliability of the data to be processed.

The information attribute measuring means of the multimedia traffic control device measures attribute information indicating whether an information error or omission is fatal to communication information from the data to be transferred, and adjusts the measured attribute information for reliability. Hand over means.

For example, in the case of a program, data, compressed data, or encrypted data, a specific bit pattern does not frequently appear repeatedly in a bit string constituting data. In the case of audio data and moving image data, the frequency of “0” or “1” appears continuously in the bit sequence of data or the frequency of occurrence of a specific bit pattern is high. Tends to be more redundant.

Therefore, the information attribute measuring means checks the bit string of the data to be transferred, and determines whether the data to be transferred is a program or data, compressed data or encrypted data, or Attribute information is obtained by identifying whether the data is audio data or moving image data.

The reliability adjusting means sets the reliability of the data to be transferred according to the attribute information measured by the information attribute measuring means and transfers the data to the destination.

That is, when the information attribute measuring means reads, as attribute information, a program, data, or a bit string indicating compressed data or encrypted data from the data to be transferred, The reliability is set as data in which information error or omission is unacceptable.

When the information attribute measuring means reads, as attribute information, a bit string indicating audio data or moving image data from the data to be transferred, the reliability adjusting means determines whether the information error or missing data is allowed. And set the reliability as

Therefore, the reliability adjusting means performs error control such as parity check and CRC when transferring a program or data or data having a bit string indicating compressed data or encrypted data. In addition, when transferring data having a bit string indicating audio data or moving image data, the reliability is set not to perform error control.

Alternatively, when transferring the program or the data or the data having a bit string indicating the compressed data or the encrypted data, the reliability adjusting means may detect and correct an information error or a missing information. The reliability may be set to perform error control with high reliability,
When transferring data having a bit string indicating audio data or moving image data, the reliability may be set so as to perform relatively low-reliability error control for detecting only information errors or omissions.

As described above, according to the multimedia traffic control apparatus, transfer reliability is set by measuring attribute information indicating whether an information error or loss is fatal to communication information. It is possible to efficiently transfer data for which information is not set according to the content.

(3) Multimedia via a transmission medium
In a multimedia traffic control apparatus for controlling traffic for transferring data, a selected illegal data is discarded, and received data is transferred to a destination instead of the discarded illegal data.

In the multimedia traffic control apparatus, the plurality of transferred data are temporarily stored in the sample and hold means. For example, when a plurality of frames of moving image data are transferred, the sample and hold Means for temporarily storing the plurality of transferred frames.

The information selecting means of the multimedia traffic control device checks the contents of the transferred data,
If there is any illegal data in the plurality of transferred data, a command for selecting the illegal data is sent to the illegal information discarding means.

For example, if an error is detected as a result of performing error control such as parity check or CRC on the plurality of transferred data in accordance with the reliability set by the reliability adjusting means, A command for selecting the data in which the error is detected as invalid data is sent to the invalid information discarding means.

The illegal information discarding means of the multimedia traffic control device selects and discards illegal data according to the selection command sent by the information selecting means,
The data stored in the sample and hold means is transferred to the destination in place of the discarded illegal data.

For example, when the plurality of transferred data are a plurality of frames constituting moving image data, the data of the frame immediately before the discarded illegal data is read out from the sample and hold means, and the read out data is read out. The data of the frame is passed to the transmission source as the discarded invalid data.

In the transfer of audio data and moving image data, real-time performance at the time of reproduction and compression may be required.
Since the communication line is generally shared by multiple requesters, it may not always be available immediately after a transfer request is issued, and even if retransmission is requested due to an error, the retransmission data is kept constant. It can be difficult to get in time.

Even when a burst transfer is performed at a constant interval in order to perform a transfer with a constant bandwidth, it is not always possible to always acquire a communication right within an allowable time, and it is necessary to output in a constant bandwidth in real time. Audio data and video data may be lost.

In the multimedia traffic control device, even if the data is not immediately usable after the transfer request is issued or the audio data or the moving image data is likely to be lost as described above, after the illegal data is discarded, Since the data immediately before the discarded illegal data is used, it is possible to prevent the reproduction from becoming impossible due to the occurrence of the illegal data, and to prevent the use of all the target streams.

As described above, according to the multimedia traffic control device, when illegal data occurs, the received data is passed to the transmission destination, so that data loss due to the illegal data can be suppressed as much as possible. is there.

[0045]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) Hereinafter, in the multimedia traffic control device of the present invention, attribute information indicating whether an information error or omission is fatal to communication information is read, and transfer reliability is determined according to the read attribute information. A multimedia traffic control device according to the first embodiment for setting the characteristics will be described.

FIG. 1 is a diagram showing a schematic configuration of a multimedia traffic control device according to the present embodiment. In FIG. 1, reference numerals 101, 109, 110 and 121 denote demultiplexed data paths, 102 and 108 demultiplexing means, 103 and 107 data input / output interfaces, 104 and 10
6 is a transmitting / receiving means, 105 is a transmission medium, 111 and 120
Is a control path, 112 and 119 are reliability adjustment means, 113, 115, 116 and 118 are data paths,
114 and 118 are attribute information reading means.

As shown in FIG. 1, the multimedia traffic control device of the present embodiment
1, 109, 110 and 121 and the demultiplexing means 102
, 108, data input / output interfaces 103 and 107, transmission / reception means 104 and 106, transmission medium 1
05, control paths 111 and 120, reliability adjusting means 112 and 119, and data paths 113 and 11
5, 116 and 118 and attribute information reading means 114
And 118.

As shown in FIG. 1, in the multimedia traffic control apparatus according to the present embodiment, data input from the demultiplexing means 102 through the data input / output interface 103 is transmitted from the transmitting / receiving means 104 to the transmission medium 10.
5 and received by the transmitting / receiving means 106, and then through the data input / output interface 107 to the demultiplexing means 108
Has passed.

As shown in FIG. 1, in the multimedia traffic control apparatus according to the present embodiment, main components include transmission / reception means 104 and 106, transmission medium 105, reliability adjustment means 112 and 119 attribute information reading means 114 and 118. Elements.

The transmission / reception means 104 and 106 of the multimedia traffic control device of the present embodiment are communication control devices which perform predetermined modulation / demodulation processing on data input / output between higher-level control devices and input / output data to / from a communication line. .

The transmission medium 105 of the multimedia traffic control apparatus according to the present embodiment is a communication medium corresponding to the communication line, and corresponds to a serial twisted pair, a coaxial cable, or a parallel cable. Is relayed by

The attribute information reading means 114 and 118 of the multimedia traffic control device according to the present embodiment.
Is a program embedded microprocessor,
It reads data to be transferred in accordance with a provided calculation procedure, detects attribute information, and outputs the attribute information.

In the multimedia traffic control apparatus according to the present embodiment, attribute information indicating whether information errors or omissions are fatal to communication information is stored in advance in data to be transferred.

Here, the stored attribute information is information indicating whether an information error or omission is allowable for the communication information.

For example, in the case of a program or data, compressed data or encrypted data, a one-bit information error or loss is not allowed, but in audio data or moving image data, a one-bit information error or loss is not allowed. , Does not affect much during playback.

Therefore, in this case, information for identifying a program, data, compressed data, or encrypted data from audio data or moving image data is set as the attribute information.

The reliability adjusting means 112 and 119 of the multimedia traffic control apparatus according to the present embodiment are microprocessors with embedded programs, and read and store the attribute information read by the attribute information reading means 114 or 118. And sends a command or algorithm for adjusting the reliability of the external resource, particularly the communication function.

For example, when the attribute information reading unit 114 or 118 reads attribute information indicating a program, data, compressed data or encrypted data from the data to be transferred, the reliability adjusting unit 112 or 119 may be used. Sets the reliability as data that does not allow information errors or omissions.

When the attribute information reading means 114 or 118 reads the attribute information indicating the audio data or the moving image data from the data to be transferred, the reliability adjusting means 112 or 119 allows information errors or omissions. And set the reliability as data.

That is, the reliability adjusting means 112 or 1
Reference numeral 19 denotes a command or an algorithm for setting the reliability and performing the error control by performing an error control such as a parity check or a CRC when transferring a program, data, compressed data, or encrypted data. Is transmitted to the transmission / reception means 104, and when transferring audio data or video data, a command or algorithm indicating that error control is not to be performed by setting reliability as not performing error control is performed. 104
Or to 106.

Alternatively, the reliability adjusting means 112 or 11
9 sets the reliability as performing relatively high-reliability error control for detecting and correcting information errors and omissions when transferring programs, data, compressed data, or encrypted data. Alternatively, when transferring audio data or moving image data, the reliability may be set so as to perform relatively low reliability error control for detecting only information errors or omissions.

Next, the operation of the multimedia traffic control device according to this embodiment will be described with reference to FIG.

When the power is turned on in the multimedia traffic control apparatus of the present embodiment, the transmission / reception means 10
4 and 106, the communication control program is loaded from the ROM and activated, and the control program is loaded from the ROM also included in the reliability adjusting means 112 and 119 and the attribute information reading means 114 and 118 and activated.

The transmitting / receiving means 104 and 106, the reliability adjusting means 112 and 119, and the attribute information reading means 11 of the multimedia traffic control apparatus according to the present embodiment.
4 and 118 initialize the inside of the apparatus according to the instruction of the control program.

Next, the demultiplexing means 102 of the multimedia traffic control apparatus of the present embodiment reads the data from the demultiplexed data paths 101 and 110, adjusts the time correspondence, and adds a predetermined marker code as needed. Then, the multiplexed data is sent to the data input / output interface 103.

The data input / output interface 103 of the multimedia traffic control apparatus according to the present embodiment passes the transmitted data to the transmission / reception means 104, and the transmission / reception means 104 transmits the transmitted data to the data path 115.
To send to.

The attribute information reading means 114 of the multimedia traffic control apparatus of the present embodiment reads data obtained from the data path 115, extracts attribute information of the data according to a calculation procedure of a built-in control program, and outputs the data. 113.

Next, the reliability adjusting means 112 of the multimedia traffic control apparatus according to the present embodiment reads the attribute information from the data path 113 and applies the reliability conforming to the attribute information according to the calculation procedure of the built-in control program. And sends a control command or an execution algorithm executed by the transmission / reception means 104 to the control path 111 in order to realize the obtained reliability.

The transmission / reception means 104 of the multimedia traffic control apparatus of the present embodiment
In accordance with a control command or an execution algorithm transmitted via the communication interface 11, the communication mode for achieving the intended reliability is executed, and after negotiation with the transmission / reception means 106 on the opposite side, data obtained from the data input / output interface 103 is transmitted to the transmission medium. Output to 105.

In the multimedia traffic control device of the present embodiment, the same operation as described above is performed when data is transferred from the transmitting / receiving means 106 to the transmitting / receiving means 104.

FIG. 2 is a flowchart showing a processing procedure of the multimedia traffic control device according to the present embodiment.

As shown in FIG. 2, in the multimedia traffic control apparatus according to the present embodiment, in the processing of step 201, the system initialization after the system power is turned on is performed.

Next, in the process of step 202, the attribute information reading means 114 reads an attribute identifier which is attribute information of data to be communicated.

Next, in the processing of step 203, the reliability adjusting means 112 determines whether or not the communication with the currently set communication reliability is valid. Proceed to processing.

In the process of step 204, the reliability adjusting means 112 obtains a protocol that can achieve the target reliability, and in the process of step 205, sets so that communication is performed according to the obtained protocol.

In the processing of step 206, the transmission / reception means 10
4 starts communication according to the set protocol, reads the attribute identifier at a specific timing during communication, monitors the validity of the current protocol, and adjusts the protocol as necessary.

In the process of step 207, the continuation or termination of the system operation is determined, and if it is continued, the process returns to the process of step 202, and the operation of reading the attribute identifier is repeated again.

As a result of judging the continuation or termination of the system operation in the process of step 207, when the system operation is to be terminated, the system is closed.

As described above, according to the multimedia traffic control device of the present embodiment, the transfer reliability is set by reading the attribute information indicating whether the information error or omission is fatal to the communication information. Therefore, it is possible to perform the transfer efficiently according to the contents of the data to be transferred.

(Embodiment 2) Hereinafter, in the multimedia traffic control device of the present invention, attribute information indicating whether an information error or omission is fatal to communication information is measured from data to be transferred, and the measurement is performed. A multimedia traffic control device according to a second embodiment that sets reliability of data to be transferred according to attribute information will be described.

FIG. 3 is a diagram showing a schematic configuration of the multimedia traffic control device of the present embodiment. In FIG. 3, reference numeral 301 denotes a data separation monitor, 302 denotes a control path, 303 and 305 denote data paths, 304 denotes a reliability adjustment unit, and 306 denotes an information attribute measurement unit.

As shown in FIG. 3, the multimedia traffic control device of the present embodiment comprises a data separation monitor 30.
1, a control path 302, data paths 303 and 305, a reliability adjustment unit 304, and an information attribute measurement unit 306.

As shown in FIG. 3, in the multimedia traffic control device of the present embodiment, the transmitting / receiving means 1
The data transmitted from the transmission medium 04 to the transmission medium 105 is passed to the information attribute measuring unit 306 by the data separation monitor 301, and the reliability adjusting unit 304 adjusts the reliability based on the attribute information measured by the information attribute measuring unit 306.

As shown in FIG. 3, the multimedia traffic control apparatus according to the present embodiment mainly includes transmission / reception means 104 and 106, transmission medium 105, data separation monitor 301, reliability adjustment means 304, and information attribute measurement means 306. Components.

The transmission / reception means 104 and 106 of the multimedia traffic control device of the present embodiment are communication control devices which perform predetermined modulation / demodulation processing on data input / output between higher-level control devices and input / output data to / from the communication line. .

The transmission medium 105 of the multimedia traffic control apparatus according to the present embodiment is a communication medium corresponding to the communication line, and corresponds to a serial twisted pair, a coaxial cable or a parallel cable. Is relayed by

The data separation monitor 301 of the multimedia traffic control device according to the present embodiment is a microprocessor with a built-in program, reads the transfer data according to the calculation procedure provided, and distributes and outputs the transfer data to a plurality. is there.

The information attribute measuring means 306 of the multimedia traffic control device of the present embodiment is a microprocessor with a built-in program, reads the transfer data in accordance with the provided calculation procedure, obtains the attribute information of the transfer data, and obtains the attribute information. Is output.

For example, in the case of a program, data, compressed data, or encrypted data, a specific bit pattern does not repeatedly appear in a bit string constituting data, so that the redundancy of the bit string constituting data is low. In the case of audio data and moving image data, the frequency of “0” or “1” appears continuously in the bit sequence of data or the frequency of occurrence of a specific bit pattern is high. Tends to be more redundant.

Therefore, the information attribute measuring means 306 checks the bit string of the data to be transferred, and determines whether the data to be transferred is a program or data, compressed data or encrypted data, or Attribute information is obtained by identifying whether the data is audio data or moving image data.

The reliability adjusting means 304 of the multimedia traffic control apparatus according to the present embodiment is a microprocessor having a program embedded therein.
The attribute information obtained in step 06 is read out, and a command or algorithm for adjusting the reliability of the external resource, particularly the communication function, is transmitted in accordance with the provided calculation procedure.

That is, when the information attribute measuring means 306 reads a program or data or a bit string indicating compressed data or encrypted data from the data to be transferred as attribute information, the reliability adjusting means 304
The reliability is set as data in which information error or omission is unacceptable.

When the information attribute measuring means 306 reads a bit string indicating audio data or moving picture data from the data to be transferred as attribute information, the reliability adjusting means 3
No. 04 sets reliability as data in which an information error or omission is allowed.

Therefore, the reliability adjusting means 304 performs error control such as parity check and CRC when transferring a program, data, or data having a bit string indicating compressed data or encrypted data. A command or algorithm for setting the reliability and performing the error control is sent to the transmitting / receiving means 104 or 106, and no error control is performed when transferring data having a bit string indicating audio data or moving image data. A command or an algorithm indicating that the error control is not performed by setting the reliability as the
Or to 106.

Alternatively, when transferring the program, the data, or the data having the bit string indicating the compressed data or the encrypted data, the reliability adjusting unit 304 performs the comparison for detecting and correcting the information error or the omission. The reliability may be set so as to perform error control of extremely high reliability, and when transferring data having a bit string indicating audio data or moving image data, only information errors and omissions are detected. The reliability may be set so as to perform error control with relatively low reliability.

Next, the operation of the multimedia traffic control device according to this embodiment will be described with reference to FIG.

When the power is turned on in the multimedia traffic control apparatus of this embodiment, the transmission / reception means 10
4 and 106, the communication control program is loaded and started, and the control program is loaded and started from the ROM which is also provided in the data separation monitor 301, the reliability adjusting unit 304, and the information attribute measuring unit 306.

Next, the transmission / reception means 104 of the multimedia traffic control apparatus of the present embodiment sends data obtained from the data input / output interface or the like to the transmission medium 105.

The data separation monitor 301 of the multimedia traffic control device of the present embodiment
5, and distributes the data to the transmission medium 105 and the data path 303 according to the calculation procedure of the built-in control program, and transmits the data.

Next, the information attribute measuring means 306 of the multimedia traffic control device of this embodiment reads the data obtained from the data path 303 and extracts the attribute information of the data according to the calculation procedure of the built-in control program. , To the data path 305.

The reliability adjusting means 304 of the multimedia traffic control device of the present embodiment
5 to read the attribute information, finds the reliability conforming to the attribute information according to the calculation procedure of the built-in control program, and transmits the control command or the execution algorithm executed by the transmitting / receiving means 104 for realizing the found reliability to the control path 302. To send to.

Next, the transmission / reception means 104 of the multimedia traffic control apparatus of the present embodiment executes the communication mode for achieving the target reliability in accordance with the control command or the execution algorithm transmitted via the control path 302. Then, after retraining with the transmitting / receiving means 106 on the opposite side, data obtained from the data input / output interface or the like is output to the transmission medium 105.

In the multimedia traffic control apparatus of the present embodiment, the same operation as described above is performed when data is transmitted from the transmitting / receiving means 106 to the transmitting / receiving means 104.

FIG. 4 is a flowchart showing a processing procedure of the multimedia traffic control device of the present embodiment.

As shown in FIG. 4, in the multimedia traffic control device according to the present embodiment, in the process of step 401, system initialization after system power is turned on is performed.

Next, in the processing of step 402, the transmitting / receiving means 104 performs test transmission of data to be communicated, and passes the test communication information to the information attribute measuring means 306 by the data separation monitor 301.

In the process of step 403, the information attribute measuring means 306 reads the test communication information, and in the process of step 404, calculates information attributes such as an information system.

Next, in the processing of step 405, the reliability adjusting means 304 determines whether or not the communication with the currently set communication reliability is valid. Proceed to processing.

In the process of step 406, the reliability adjusting means 304 obtains a protocol capable of realizing the target reliability, and in the process of step 407, sets so as to perform communication using the obtained protocol.

In step 408, the transmission / reception means 10
4 starts communication according to the set protocol, reads the attribute identifier at a specific timing during communication, monitors the validity of the current protocol, and adjusts the protocol as necessary.

In the process of step 409, the continuation or termination of the system operation is determined. If the system operation is to be continued, the process returns to step 403, and the operation of reading the attribute identifier is repeated again.

As a result of judging the continuation or termination of the system operation in the processing of step 409, when the system operation is to be terminated, the system is closed.

As described above, according to the multimedia traffic control apparatus of the present embodiment, the transfer information is set by measuring the attribute information indicating whether an information error or omission is fatal to the communication information. Therefore, data for which attribute information is not set can be efficiently transferred according to the content.

Embodiment 3 Hereinafter, in the multimedia traffic control apparatus of the present invention, an embodiment in which selected illegal data is discarded and received data is transferred to a destination instead of the discarded illegal data. The third multimedia traffic control device will be described.

FIG. 5 is a diagram showing a schematic configuration of the multimedia traffic control device of the present embodiment. In FIG. 5, 501, 502, 504, 505, 507 and 508 are buffers, 503 and 512 are separated data paths, 506 is a data path, 509 is information selection means, and 51 is a data path.
0 is a control path and 511 is an illegal information discarding means.

As shown in FIG. 5, the multimedia traffic control device of this embodiment comprises buffers 501 and 50.
2, 504, 505, 507, and 508, separated data paths 503 and 512, a data path 506, an information selection unit 509, a control path 510, and an unauthorized information discarding unit 511.

As shown in FIG. 5, in the multimedia traffic control device of the present embodiment, the transmitting / receiving means 1
After the data received at step 06 is passed to the demultiplexing means 108 via the data input / output interface 107, the buffers 502, 507 and
08, and the data selected by the information selection means 509 is discarded by the unauthorized information discarding means 511.

As shown in FIG. 5, the multimedia traffic control apparatus according to the present embodiment comprises transmission / reception means 104 and 1
06, the transmission medium 105, the information selection unit 509, and the unauthorized information discarding unit 511 are main components.

The transmission / reception means 104 and 106 of the multimedia traffic control device of the present embodiment are communication control devices which perform predetermined modulation / demodulation processing on data input / output between higher-level control devices and input / output to / from the communication line side. .

The transmission medium 105 of the multimedia traffic control device of the present embodiment is a communication medium corresponding to the above-mentioned communication line, and corresponds to a serial twisted pair, a coaxial cable or a parallel cable. Is relayed by

The information selecting means 509 of the multimedia traffic control apparatus according to the present embodiment is a microprocessor with a built-in program, reads information for selecting received data, and sends out a command for selecting information according to the provided calculation procedure. is there.

For example, according to the reliability set by the reliability adjusting means 112, 119, or 304, a parity check or a CR check is performed on the plurality of transferred data.
If an error is detected as a result of performing error control such as C, a command for selecting the data in which the error is detected as invalid data is sent to the invalid information discarding means 511.

The illegal information discarding means 511 of the multimedia traffic control device according to the present embodiment is a program embedded type microprocessor, reads the received data and the information selection command corresponding to the received data in accordance with the provided calculation procedure, and executes After the selection, the received data is output according to the selection result.

Next, the operation of the multimedia traffic control device according to the present embodiment will be described with reference to FIG.

When the power is turned on in the multimedia traffic control apparatus of this embodiment, the transmission / reception means 10
4 and 106, the communication control program is loaded from the ROM and activated, and the control program is loaded from the ROM also included in the information selecting means 509 and the illegal information discarding means 511 and activated.

Next, the buffers 501, 504 and 505 of the multimedia traffic control apparatus according to the present embodiment.
The writing of the corresponding video or audio data that needs to be transmitted is allowed to the one in which no data is stored.

[0127] The demultiplexing means 102 of the multimedia traffic control apparatus of this embodiment comprises a buffer 501,
Read a plurality of corresponding data from 504 and 505,
Multiplex according to the prescribed procedure, add markers as necessary,
The data is sent to the data input / output interface 103.

Next, the data input / output interface 103 of the multimedia traffic control apparatus according to the present embodiment is described.
Reads the multiplexed data and sends and receives
4, and the transmission / reception means 104 sends the data obtained from the data input / output interface 103 to the transmission medium 105.

Next, the transmitting / receiving means 106 of the multimedia traffic control apparatus of the present embodiment
5 to receive data from the data input / output interface 1
07, and information of a data error is sent to the data path 506.

After receiving the data, the data input / output interface 107 of the multimedia traffic control apparatus according to the present embodiment sends the received data to the demultiplexing means 108, and the demultiplexing means 108 sends the received data. The data is separated into data such as video and audio, and written into the corresponding buffer 502, 507 or 508.

On the other hand, the information selecting means 509 of the multimedia traffic control device of the present embodiment reads the data obtained from the data path 506,
Among the data written in 507 and 508, the data in which an error has occurred is specified in accordance with the calculation procedure of the built-in control program, and the information indicating the specified data in which the error has occurred is transmitted to the control path 510. I do.

Next, the illegal information discarding means 511 of the multimedia traffic control device of the present embodiment reads the information specifying the data in which the error has occurred from the control path 510, and follows the calculation procedure of the built-in control program. The erroneous data is discarded, and subsequent transmission to the separated data path 503 or 512 is stopped.

In the multimedia traffic control apparatus according to the present embodiment, the partial information that has been lost due to the above-mentioned stall is applied to the video data of one frame or one field before in the case of video data, and to the error data in the case of audio data. Applied with audio data.

FIG. 6 is a flowchart showing a processing procedure of the multimedia traffic control device according to the present embodiment.

As shown in FIG. 6, in the multimedia traffic control device according to the present embodiment, in the process of step 601, the system initialization after the system power is turned on is performed.

Next, in step 602, the transmission / reception means 104 starts communication, and the transmission / reception means 106 on the receiving side receives the data.

In step 603, the demultiplexing means 1
08, after separating the received data into multiplexed information, the separated received data is used as a frame A in the buffer 50.
Hold at 2,507 or 508.

The next data transmitted again from the transmitting / receiving means 104 on the transmitting side is received by the transmitting / receiving means 106 on the receiving side. Or hold at 508.

Next, in the process of step 605, the information selecting means 509 detects an irregularity of the received data, that is, an information error, and sends information specifying the detected erroneous data to the illegal information discarding means 511. .

In the process of step 606, the fraudulent information discarding means 511 checks whether the erroneous data is frame A or frame B.

As a result of checking the data in which an error has occurred in the processing in step 606, if the error has occurred in the frame A, the flow advances to the processing in step 607.

In the process of step 607, the illegal information discarding means 511 discards the frame A in which the error has occurred,
When the frame A is output, the frame B is output instead.

As a result of checking the data in which an error has occurred in the processing in step 606, if the error has occurred in the frame B, the flow advances to the processing in step 608.

In the process of step 608, the illegal information discarding means 511 discards the frame B in which the error has occurred,
When the frame B is output, the frame A is output instead.

In the process of step 609, the continuation or termination of the system operation is determined. If the system operation is to be continued, the process proceeds to step 610, where frame A is copied to frame B, and then the process returns to step 604.

Further, as a result of the determination of the continuation or termination of the system operation in the processing of step 609, when the system operation is to be terminated, the system is closed.

As described above, according to the multimedia traffic control device of the present embodiment, when illegal data occurs, the received data is passed to the transmission destination.
Data loss due to unauthorized data can be suppressed as much as possible.

As described above, the present invention has been specifically described based on the above embodiments. However, the present invention is not limited to the above embodiments, and it is needless to say that various modifications can be made without departing from the gist of the present invention. It is.

[0149]

The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows.

(1) Since the transfer reliability is set by reading the attribute information indicating whether the information error or omission is fatal to the communication information, the transfer can be performed efficiently according to the contents of the data to be transferred. Is possible.

(2) Since the transfer reliability is set by measuring attribute information indicating whether an information error or omission is fatal to communication information, data without attribute information is set according to the content. It is possible to transfer efficiently.

(3) Since the received data is passed to the transmission destination when the illegal data occurs, it is possible to suppress data loss due to the illegal data as much as possible.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a schematic configuration of a multimedia traffic control device according to a first embodiment.

FIG. 2 is a flowchart illustrating a processing procedure of the multimedia traffic control device according to the first embodiment.

FIG. 3 is a diagram illustrating a schematic configuration of a multimedia traffic control device according to a second embodiment.

FIG. 4 is a flowchart illustrating a processing procedure of the multimedia traffic control device according to the second embodiment.

FIG. 5 is a diagram illustrating a schematic configuration of a multimedia traffic control device according to a third embodiment.

FIG. 6 is a flowchart illustrating a processing procedure of the multimedia traffic control device according to the third embodiment.

[Explanation of symbols]

101, 109, 110 and 121 ... separated data paths,
102 and 108: demultiplexing means, 103 and 107 ...
Data input / output interface, 104 and 106 transmitting / receiving means, 105 transmission medium, 111 and 120 control path, 112 and 119 reliability adjusting means, 11
3, 115, 116 and 118: data path, 114 and 118: attribute information reading means, 301: data separation monitor, 302: control path, 303 and 305
... data path, 304 ... reliability adjustment means, 306 ... information attribute measurement means, 501, 502, 504, 505, 50
7 and 508: buffer, 503 and 512: separated data path, 506: data path, 509: information selecting means,
510: control path, 511: illegal information discarding means.

Claims (3)

[Claims] A multimedia system for controlling traffic for transferring multimedia data over a transmission medium.
In the traffic control device, attribute information reading means for reading attribute information indicating whether an information error or omission is fatal to communication information from data to be transferred, and data to be transferred according to the attribute information read by the attribute information reading means And a reliability adjusting means for setting the reliability of the multimedia traffic control device. 2. A multimedia system for controlling traffic for transferring multimedia data over a transmission medium.
In the traffic control device, an information attribute measuring unit that measures attribute information indicating whether an information error or omission is fatal to communication information from data to be transferred, and a transfer according to the attribute information measured by the information attribute measuring unit. And a reliability adjusting means for setting reliability of data to be transmitted. 3. A multimedia system for controlling traffic for transferring multimedia data via a transmission medium.
In the traffic control device, sample and hold means for temporarily storing the transferred data, information selecting means for selecting the transferred data, and discarding the illegal data selected by the information selecting means. A multimedia traffic control device, comprising: illegal information discarding means for passing data in a sample and hold means instead of illegal data to a destination.