JP3106091B2 - Digital image information multiplexing transmission method, transmitting apparatus and receiving apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to multiplex transmission of digital image information.

[0002]

SUMMARY OF THE INVENTION The present invention has a simple structure, and selectively self- selects three types of digital information of character information, still picture (JPEG) information, and moving picture / audio (MPEG) information. It is intended to realize transmission that can be multiplexed in any combination.

[0003]

To achieve the above object , a digital image information multiplex transmission method according to claim 1.
Union of the invention, selectively freely three types of digital information
Align a digital image information multiplexing transmission method for multiplexing and transmitting Te, sender, a multiplexed information including data status information indicating validity of said digital information synchronizing signal, and multiplexing the digital information A frame is composed of fixed-length character information, JPEG information of a fixed-length still image, and MPEG information of a fixed-length video / audio.
The frame continuously transmitted at a constant rate, the receiver detects the frame by said synchronization signal, said frame
The character information by the data length of over arm, decomposing the JPEG data and the MPEG information, degraded thereof
For each digital information, only data of valid digital information indicated in the data status information is processed and edited.

[0004] Here, the transmitting side send multiple pre <br/> Symbol same data status information in a frame unit, said receiving side, taking the majority of the data status information more transmitted in frames Correct data stay
The task information may be determined.

[0005] In order to achieve the above object, the invention of the transmitting device according to claim 3 is to selectively transmit three types of digital information.
A transmitting apparatus of a digital image information multiplexing transmission method for multiplexing and transmitting in a freely multiplexed manner, comprising: a multiplexing method including a synchronization signal and data status information indicating validity of the multiplexed digital information. Information and the digital information.
That a fixed length character information, and a fixed length of the still picture of JPEG data, and means for forming a frame in an MPEG information fixed-length movie or sound, means for continuously transmitting the frame at a constant speed And characterized in that:

Here, a plurality of the same data status information may be transmitted on a frame basis .

[0007] In order to achieve the above object, the invention of the receiving device according to claim 5 is to selectively output three types of digital information.
A receiving apparatus of a digital image information multiplexing transmission method for freely multiplexing and transmitting multiplexed digital information, the multiplexing including a synchronization signal and data status information indicating validity of the multiplexed digital information Information and the digital information.
That the text information of a fixed length, and JPEG data of a fixed length of a still image, from the received signal constituting the frame in an MPEG information fixed-length video and audio, frame by said sync signal - detecting the beam Means and each data length of the frame
The character information, the JPEG information and said MPEG data decomposing means, degraded the digital information thereof
Against the valid data indicated in the data status information.
Means for processing and editing only digital information data.

[0008] Here, it is possible and determines the correct data status information by majority with respect to the data status information in which a plurality transmit the same information in frame units.

[0009]

[Action] More above configuration, in the present invention, in a compact configuration,
The three types of digital information of character information, still image (JPEG) information, and moving image / audio (MPEG) information can be selectively multiplexed and transmitted freely. And
Combine them information transmitted on the receiving side can be displayed on the screen.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

In this embodiment, a one-to-n transmission system for transmitting data from a transmitting side to a receiving side via a satellite will be described.

FIG. 1 shows a format of one frame (2048 bytes) of communication transmitted from a transmitting side to a receiving side via a satellite. This frame is transmitted at 125 frames / sec (1 frame / 8 ms) in this embodiment.

FIG. 1A shows a format of one frame. In this one frame format,
1 is 16-byte multiplex information (MPX), 2 is 96-byte text information including application control information and character information (TEX), and 3 is 400-byte J for still image.
PEG information. Reference numeral 4 denotes 1536 bytes of moving picture and audio MPEG information.

FIG. 1B shows the format of the multiplexed information 1. The first two bytes of the multiplexed information are a frame synchronization signal for synchronizing the frames. The next six bytes are
It is not used in this embodiment. The next 6 bytes are information indicating the multiplexing state in the data status information. The next two bytes are forbidden areas and are not used on the transmitting side but are used on the receiving side. The multiplex information is 16 bytes.

FIG. 1C shows a synchronization signal used for multiplexed information. As the synchronization signal, a signal predetermined on the transmission side and the reception side is used. The synchronization signal shown here is 0E471h. A frame can be detected using the synchronization signal as a mark.

FIG. 1D shows the format of the data status information. The same 2-byte information shown here is transmitted three times to form 6-byte data status information. The reason why three pieces of the same information are sent is that the receiving side selects information to be adopted by the majority decision method. The data status information includes the following text information of control / character information for AP, JPEG information, and flags (M, J, T) indicating whether the MPEG information is valid. If the flag is 1, it indicates that the corresponding information is valid and has been sent. For example, if the flag of T is 1, it indicates that the control / character information for AP (text information) is valid and transmitted.

Attention is information on a specific application in the receiving system. This needs to be determined in advance by the transmitting side and the receiving side.

FIG. 1E shows the format of a prohibited area. In the format of the multiplexed information, the transmitting side does not use it, and the receiving side uses the first three bits of the two bytes as a flag indicating whether each information is stored in the memory. That is, when the ME flag is 1,
This indicates that the MPEG information is stored in the memory.

FIG. 2 shows a system configuration on the transmission side. FIG.
Reference numeral 201 denotes a processing device constituted by a work station or the like, which mainly processes text information and JPEG information to be transmitted on the transmission side. Reference numeral 202 denotes an input device.
This is an input for processing on the transmission side. Reference numeral 203 denotes a display device which can display information or the like currently being transmitted. 2
Reference numeral 06 denotes a still video camera, which can capture a still image into the processing device via the image interface 207. Then, it can be transmitted as JPEG information. A transmission side multiplexing interface 208 transmits transmission information to an antenna via a transmitter. Information (including still images and moving images) can be transmitted to the satellite via this interface. Reference numeral 213 can take a moving image with a video device such as a television camera VCR. A microphone 214 can capture audio and the like. The video from the television camera 213 and the audio information from the microphone 214 are converted to MPEG information via the video interface 215 and sent to the transmission-side multiplex interface 208.

FIG. 3 shows the configuration of the multiplex interface of FIG. Reference numerals 301 and 302 denote input / output terminals to the monitoring control unit 311. Here, data is sent from the processing device 201 in RS-232C serial start-stop synchronization. 303
Is a data input terminal to which character information and JPEG information from the processing device 201 are input. Here, of the multiplexed information, information other than the synchronization information is added and input. 3
04 and 305 are MPEG input terminals. The moving picture interface of FIG. 2 is connected to the one input terminal. The other input terminal inputs MPEG information from the ISDN line. MP input to these two input terminals
The selection circuit 308 selects which of the EG information is to be multiplexed. A clock generation circuit 309 generates various clocks by using a clock from the ISDN line as a master clock on the transmission side. Reference numeral 307 denotes a frame synchronization signal generation circuit which is a synchronization signal serving as a mark of a frame (see FIG.
(See (c)). The input information is multiplexed by the multiplexing unit 310 into the format shown in FIG. At this time, the data status information shown in FIG. The multiplexed information is subjected to error correction coding in an error correction coding unit 312. Then, the signal is modulated and becomes a signal of 140 MHz band.
This is output to the transmitting device 316 of the satellite. It becomes 14 GHz in the transmitting device and is emitted from the antenna 317 to the satellite. The monitoring control unit 311 includes the multiplex interface 20
8 is performed, and the result is displayed on the liquid crystal display panel 314.

The multiplexing information, character information and JPEG information from the processing device 201 are transmitted to the multiplexing interface 20.
The information is multiplexed with the synchronization information and the MPEG information generated in step 8 and output to the transmitter.

FIG. 4 shows a system configuration on the receiving side. FIG.
In the figure, reference numeral 401 denotes a processing device, which has the same configuration as a personal computer on which ordinary Windows and the like operate together with a display device 402, a keyboard 403, and the like. 40
Reference numeral 4 denotes a receiving / decomposing interface that receives multiplexed information, decomposes digital information received from the satellite, and sends the digital information to the processing device 401 and the like. Reference numeral 408 denotes an MPEG playback unit which receives moving picture / tone color information (MPEG
Information) is input, reproduced, and sent to the processing device 401. The processing device 401 can process and edit the received valid information and display it on the display device 402. Also,
Since the MPEG information is reproduced by the MPEG reproducing unit 408 independent of the processing device 401, the processing load on the processing device 401 is small.

FIG. 5 is a functional block diagram of the satellite communication interface 404 (see FIG. 4) in the terminal. In this figure, the received signal that has been error-decoded from the tuner and has become the original baseband is divided by the synchronization detection unit 503 for each frame. Upon receiving the signal from the synchronization detecting unit, the data dividing unit 502 divides the data of each frame by a specified data length. The result of the division is shown as multiplex information 504, character information (data) 505, JPEG information 506, and MPEG information 507. The invalid data is masked by the data status flag in the multiplex information, and valid character information 505 and JPEG information 506 are stored in the memory 508 together with the multiplex information 504. The information stored in the memory 508 is sent to the terminal processing device 401 by DMA transfer. If the MPEG information 507 is valid, the information is sent to the MPEG reproducing unit 408 (see FIG. 4).

FIG. 6 is a more specific block diagram of the functional block diagram shown in FIG. In FIG. 6, 600
Is an input terminal to which a received signal that is a baseband serial signal is input. 601 is a serial / parallel conversion circuit, and 604 is a frame memory, which is 16-bit parallel character information, JPEG information , and a header.
The multiplexing information is stored in the frame memory 604 . The frame memory 604 is a virtual FIFO composed of an SRAM, and is controlled using a frame memory arbitration circuit 605. A synchronization detection / record separation circuit 603 performs synchronization detection, majority decision of data status, validity detection of data, and the like. Reference numeral 602 denotes a frame memory write / serial / parallel conversion control circuit.
03 is controlled by a signal from An MPEG timing control circuit 606 is a synchronization detection / record separation circuit 60.
3 from the input terminal 600 via the MPEG data register 607 in accordance with the signal from
It is sent directly to the playback unit 408. DMA data register 60
8, the frame memory read DMA control circuit 609 and the DMA transfer control circuit 610
Is read out and DMA-transferred in response to an instruction from the processing device 401.

The received signal from the tuner input to the input terminal 600 is determined by the synchronization detection / record separation circuit 603 to detect a specific synchronization signal twice in succession to determine the synchronization and start reading the frame. After the synchronization is determined, the synchronization is not lost unless the synchronization is detected twice or more consecutively. When the synchronization is lost, the frame memory is reset and an out-of-synchronization interrupt is generated. Then, the majority of the data status information is determined, and a prohibition area is created based on the result. Serial / parallel conversion circuit 60
At 1, the bit serial is converted to 16-bit parallel data , and multiplexed information as header , valid character information, JP
Write the EG information to the frame memory. When one frame is stored in the frame memory 604, a frame counter (not shown) is incremented by 1 and a frame interrupt is generated via the terminal 612. The frame counter can count up to 32. Writing to the frame memory 604 is controlled by a frame memory / light serial / parallel conversion control circuit 602 and a frame memory arbitration circuit 605.

FIG. 7 shows the state of the frame written in the frame memory 604. Frames n, n + 1, n +
2 are written in order. Multiplex information (MPX) is written in each frame as a header. n + 2
No JPEG information was written in the frame because it was not valid. As shown in FIG. 7, the frame memory 604 is controlled by a frame memory arbitration circuit 605, and is read out in the order of writing.

The MPEG information is sent directly to the MPEG reproducing unit 408 via the MPEG timing control circuit 606 and the MPEG data register 607 according to a signal from the synchronization detection / record separation circuit 603. However, when the MPEG information is also sent to the processing device 401, it is sent after being stored in the frame memory 604.

From the frame memory to the processing device 401,
Data is transferred by DMA (Direct Memory Access). When one frame is accumulated in the frame memory, a frame interrupt is applied to the processing device 401.
Then, the 16-byte multiplexed information at the head of the frame is read, and an effective data length is obtained. The data length information is transferred from the frame memory to the frame memory read DM.
DMA transfer is performed by the A data register control circuit 609 and the DMA transfer control circuit 610. When one frame is read, a frame counter (not shown) is decremented by one.

8 and 9, examples of character information and JPEG information transmitted in the frame will be described. FIG.
In this example, the same three pieces of 32-byte information are sent as the character information 2 in (a). Error correction and checking are performed by majority decision. FIG. 8 shows the format of a frame for every 32 bytes of character information. As can be seen from FIG. 8, normal character information is transmitted over a plurality of frames each of 32 bytes.

FIG. 8A shows a header frame, and FIG.
FIG. 8 (b) shows a detailed frame, and FIG. 8 (c) 3 shows an end frame in units of 32 bytes of a frame sent as character information 2 from a satellite.
The first byte of the frame of the character information is provided with an identification code indicating the type of the frame. H for header frame, D for detail frame, E for end frame
It is.

The header frame shown in FIG. 8A has a 1-byte identification code, a 2-byte message type,
It contains the number of transmission frames of 3 bytes. The next 24 bytes are not used in this embodiment.

FIG. 8B shows a frame for storing information to be sent. The information is actually sent in this frame. An identification code indicating that the frame is an information frame is provided.

FIG. 8C shows an end frame, which is one byte of an identification code, one byte of a test mode, two bytes of a message type, two bytes of a distribution number, and are not used in this embodiment. It is composed of 22 bytes.

The character information is sent from the satellite in the structure of the character information. Therefore, character information is assembled from a plurality of frames and used in terminal processing.

FIG. 9 shows a set of JPEG information to be transmitted with two still images. Each of the two still images is composed of 9 Kbytes. The first three bytes of the 400 bytes transmitted in each frame are provided with three identical 1-byte division codes indicating the type of JPEG information transmitted in the frame. A majority decision is made with the same three-section code, and error correction and checking are performed. Accordingly, since 397 bytes of JPEG information are transmitted in one frame, information of one still image can be transmitted in 31 frames.

The 397 bytes sent in the first frame in FIG. 9 include three sets of the same H frame (header frame), and error checking is performed by majority decision using the same three sets of H frames. The H frame is composed of a message type of 4 bytes, a distribution number of 4 bytes, a first image frame transmission number of 2 bytes, and a second image frame transmission number of 2 bytes.

Then, for example, 31 pieces of still image data displayed as the first still image display portion and 31 pieces of still image data displayed as the second still image display portion are continuously transmitted.

Finally, the same three E-frames (end frames) of 9 bytes are sent. This E frame is composed of a flag indicating the test mode, 1 byte, a message type of 4 bytes, and a distribution number of 4 bytes. A majority decision can be made with these three E frames.

Information is sent to the receiving side using character information, JPEG information, and MPEG information in the formats shown in FIGS. 1, 8, and 9. On the receiving side, character information, JPEG information, and MPEG information are separated from the transmitted multiplexed information, assembled for each piece of information, and used.

In the above embodiment, satellite communication is used, but any communication line that can transmit high-speed communication may be used.

[0041]

As described above , according to the present invention,
With a simple configuration, it is possible to realize transmission in which three types of digital information of character information, still picture (JPEG) information, and moving picture / audio (MPEG) information can be selectively and freely combined and multiplexed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a format of a frame used in the present invention.

FIG. 2 is a block diagram illustrating a configuration of a transmission side system.

FIG. 3 is a block diagram of a transmission multiplex interface.

FIG. 4 is a block diagram illustrating a configuration of a receiving system.

FIG. 5 is a functional block diagram of a reception division interface.

FIG. 6 is a block diagram of a reception division interface.

FIG. 7 is a diagram showing a state of a frame stored in a frame memory.

FIG. 8 is a diagram illustrating an example of transmitted character information.

FIG. 9 is a diagram illustrating an example of JPEG information to be transmitted.

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H04N ^7/ 00-7/088 H04N ^7/ 24-7/68 H04J 3/00

Claims (6)

(57) [Claims] 1. Selectively and freely select three types of digital information
In combination with a digital image data multiplexing transmission method for multiplexing and transmitting, sender, multiplexed information including data status information indicating validity of said digital <br/> synchronized information signals, and multiplexing And the digital information, fixed-length character information,
And JPEG data of a fixed length of a still image, and a frame in an MPEG information fixed-length video and audio, continuously transmits the frame at a constant speed, the receiving side, the frame by the synchronization signal Detect
The character information by the data length of the frame, the JP
Disassemble the EG information and the MPEG information, it exploded this
A digital image information multiplexing transmission method characterized by processing and editing only valid digital information data indicated in the data status information for each of the digital information . 2. A digital image information multiplexing transmission method of claim 1, wherein the transmitting side, the frame by frame the same data status information multiple transmission, the receiving side, the having a plurality transmitted in frames by taking the majority of the data status information, correct de
Data image multiplexing transmission method, wherein data status information is determined. 3. Selectively and freely select three types of digital information.
In combination with a transmission apparatus for digital image information multiplexing transmission method for multiplexing and transmitting a multiplexed information including data status information indicating validity of said digital information synchronizing signal, and multiplexing, the
Fixed-length character information that is digital information, JPEG information of a fixed-length still image, and MPEG of a fixed-length video / audio
A transmission device comprising: means for forming a frame with information; and means for continuously transmitting the frame at a constant speed. In the transmission apparatus of claim 3, wherein, deflection
A plurality of the same data status information transmitted in units of frames. 5. Selectively and freely selecting three types of digital information
In combination with a receiving apparatus for digital image information multiplexing transmission method for multiplexing and transmitting a multiplexed information including data status information indicating validity of said digital information synchronizing signal, and multiplexing, the
Fixed-length character information that is digital information, JPEG information of a fixed-length still image, and MPEG of a fixed-length video / audio
From the received signal constituting the frame information, the frame by the <br/> synchronization signal - means for detecting the beam, wherein the character information by the data length of the frame, the JP
EG information and a means for decomposing the MPEG information, to degradation by the respective digital information of the data of the valid digital information shown in the data status information
And a means for processing and editing only the data. 6. The receiving apparatus according to claim 5, wherein, deflection
Receiver and determines the correct data status information by majority with respect to the data status information in which a plurality transmit the same information in over arm units.