JPH10191272A - Multiplex transmitting method and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To disperse burst errors and to improve error correction efficiency by dividing data obtained by multiplexing the variable length frame of image data which is compressed/encoded into specified lengths and generating and transmitting a fixed length frame from data which is rearranged after error correction/encoding and from data which is compressed and encoded, separating compressed/encoded data and taking it out on a reception side. SOLUTION: Compressed picture data from an image data compression means 3, data for control from a data processing means 5 and data from a peripheral unit are set to be convenient variable length frames. Then, data is multiplexed and multiplexed data is equally divided. Then, it is outputted to an error correction/encoding means 7 as equal division data. The error correction/ encoding means 7 executes error correction/encoding on equally divided data and an inspection code is added. Then, data is outputted to a data rearrangement means 8. Data is outputted and transmitted to a fixed length frame generation means 11 after rearrangement. Thus, the burst errors occurred in a transmission process can highly precisely be transmitted as random errors.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplex transmission method and a multiplex transmission apparatus for multiplexing and transmitting images, voices, and various other data via wireless transmission means such as a PHS.
A multiplex transmission method and a multiplex transmission apparatus that are particularly resistant to transmission errors and that can improve error correction efficiency.

[0002]

2. Description of the Related Art Conventionally, a method of multiplexing transmission (communication) of images, sounds, and data is described in CCITT (current ITU-
T.) recommended by H. 221 are known,
H. 221 is N-ISDN (Narrow Band Integrated
This is a method for multiplexing video, audio, and other data for realizing videophone and videoconferencing using the Services Digital Network (Narrowband Integrated Services Digital Network from 64 to 1920 kbps).

[0003] H. In 221, the image and the sound are each compression-encoded, multiplexed with the data and transmitted, the data is separated on the receiving side, and the image and the sound are respectively decompressed and decoded and reproduced.

[0004] Among conventional multiplex transmissions, an image transmission method will be described in particular with reference to FIG. FIG. 6 is a block diagram showing a schematic configuration of a conventional image transmission method. In the conventional image transmission method, the transmitting side includes a video capturing unit 1, an A / D converting unit 2, an image data compressing unit 3, and an error correction encoding unit 7, and the receiving side includes an error correcting decoding unit 1.
6, image data decompression means 20, and D / A conversion means 21
And video display means 22.

[0005] The image capturing means 1 is an image capturing means such as a video camera for capturing an image, and outputs the captured image as an analog video signal. A / D conversion means 2
Performs analog-to-digital (A / D) conversion of an analog video signal captured by the video capturing means 1. In the case where the image capturing means 1 is a means for outputting a salt signal as a digital signal (for example, a digital camera)
Does not require this A / D conversion means.

The image data compressing means 3 compresses and encodes digital image data. As a generally known encoding method, JP which performs compression encoding of a still image is used.
EG, MPEG for compressing and encoding moving images, H.264. 26
There is 1 mag. In addition, about the specific method of compression encoding,
The description is omitted here because it is not related to the characteristic part of the present case.

[0007] The error correction encoding means 7 performs error correction encoding by dividing the compressed image data compressed and encoded by the image data compression means 3 into encoding unit bytes or bit lengths. Generally known error correction coding methods include a BCH coding method, a Reed-Solomon coding method, and a Vidabi coding method. Note that the specific method of the error correction encoding is not related to the characteristic part of the present invention, and thus the description is omitted here.

[0008] The error correction decoding means 16 performs error correction decoding of the received data. The image data expansion means 20 expands and decodes the error-corrected compressed image data, and outputs digital image data. The D / A conversion means 21 converts the digital image data from the image data decompression means 20 into a digital-analog (D
/ A) performs conversion and outputs an analog video signal.

The video display means 22 is a display means such as a television monitor or a liquid crystal display for displaying the transmitted video.
If the image display means 22 is digitally output data, the D / A conversion means 21 is unnecessary.

The operation of the conventional image transmission method is as follows. A video signal fetched by the video fetching means 1 is converted into digital image data by the A / D conversion means 2 and the image data compression means 3
Are compressed and coded into compressed image data, error-correction-coded by the error-correction coding means 7 for each unit, and transmitted to a transmission path or a wireless communication path.

The data received from the transmission path or the wireless communication path is subjected to error correction decoding by the error correction decoding means 16, expanded and decoded by the image data expansion means 20, and
The video signal is converted into an analog video signal by the A conversion means 21 and displayed on the video display means 22.

[0012]

However, the above-mentioned conventional multiplex transmission method is premised on communication via transmission means having good line quality such as a digital communication network, and is performed in a transmission process on a communication path having poor line quality. However, there is a problem that the error of the above is not sufficiently considered.

Particularly, in the image transmission method, the error correction means (the error correction coding means 7 and the error correction decoding means 1
The number of error-correctable bits (bytes) in 6) is limited, and error correction coding tends to be strong against random errors but weak against large burst transmission errors.
In the transmission means having many burst transmission errors, there is a problem that the image cannot be reproduced without being completely corrected or the reproduced image is largely disturbed.

In particular, in the case of a PHS terminal which is attracting attention as a means for wireless transmission, for example, data transmission, the average error rate with respect to the distance between the PHS terminal and the base station is about 10 m and 1
About 0-6, about 10-5 at about 20m, 10 at about 50m
It is said to be about -4, about 100m and about 10-3,
In addition, it has been known that, depending on the moving speed of the PHS terminal, it has a property of generating a burst-like error called Rayleigh fading which fluctuates in a short time. Therefore, there is a problem that the image cannot be reproduced or the accuracy of the reproduced image is considerably deteriorated.

[0015] The present invention has been made in view of the above-mentioned circumstances. Even in multiplex transmission using a transmission path having many burst transmission errors, such as a PHS terminal, multiplex transmission that is resistant to transmission errors and can improve error correction efficiency. It is an object to provide a method and a multiplex transmission device.

[0016]

According to a first aspect of the present invention, there is provided an image processing apparatus comprising: a compression coded image data; a compression coded audio data; and other data. In the multiplex transmission method of multiplexing and transmitting, a variable length frame of compression-encoded image data and a variable length frame of other data are multiplexed on the transmission side, and the multiplexed data is transmitted to a specific length. Error-correction coding, and rearranges the plurality of error-correction-coded data in units of bits or bytes, and creates a fixed-length frame from the rearranged data and the compression-encoded audio data. The receiving side separates the rearranged data from the received fixed-length frame from the compression-encoded audio data, restores the rearranged data to the original, and performs error correction decoding. It is characterized by separating and extracting compression-encoded image data and other data from the decoded data.By rearranging the data and distributing it, the burst error generated in the transmission process is dispersed and the random error is dispersed. Can be changed to

According to a second aspect of the present invention, there is provided the multiplex transmission method according to the first aspect, wherein a plurality of error-correction encoded data are stored in a plurality of columns in a horizontal direction. Is characterized in that a plurality of rearranged data read and rearranged in the vertical direction, received and separated are stored in the vertical direction, read out in the horizontal direction and returned to the original state, and the data is read in units of bits (bytes). By rearranging the data in the vertical and horizontal directions and transmitting the data, it is possible to disperse the burst errors generated in the transmission process and change them to random errors, thereby expanding the range in which errors can be corrected.

According to a third aspect of the present invention for solving the above-mentioned problems of the conventional example, compression-encoded image data, compression-encoded audio data, and other data are multiplexed and transmitted. In the multiplex transmission device, the transmitting side multiplexes the variable-length frame of the compression-encoded image data and the variable-length frame of other data, and divides the multiplexed data into specific lengths to divide them equally. Variable-length frame generating means for outputting data, error-correcting coding means for performing error-correction coding on the equally-divided data and outputting coded data, and rearranging the plurality of coded data in bit units or byte units. Data rearranging means for outputting rearranged data; fixed-length frame generating means for generating a fixed-length frame from the rearranged data and the compression-encoded audio data; Transmitting means for transmitting the fixed-length frame, receiving means for receiving the fixed-length frame on the receiving side, and fixed-length frame separation for separating data rearranged from the fixed-length frame and compression-encoded audio data. Means, data rearrangement means for restoring the rearranged data, error correction decoding means for error correcting and decoding the restored data, and an image compressed and encoded from the decoded data. It is characterized by having variable-length frame separation / disassembly means for separating and taking out data and other data, and by rearranging and transmitting data, a burst error generated in a transmission process is dispersed and changed to a random error. be able to.

[0019]

Embodiments of the present invention will be described with reference to the drawings. The multiplex transmission method and the multiplex transmission device according to the present invention include:
A variable-length frame is created from control and other data, further divided into equal lengths, error-correction-encoded, and then rearranged in bit units. Create and transmit frames,
On the receiving side, various data are reproduced by the reverse processing operation of the transmitting side, so even on a transmission line with many burst transmission errors, error correction efficiency can be improved by correcting burst transmission errors as random errors, Multiplex transmission with high accuracy is possible.

First, the configuration of a multiplex transmission method (this method) according to the present invention will be described with reference to FIGS. FIG. 1 is a block diagram on the transmitting side of the multiplex transmission method according to the embodiment of the present invention, and FIG. 2 is a block diagram on the receiving side of the multiplex transmission method according to the embodiment of the present invention.
Parts having the same configuration as in FIG. 6 are described with the same reference numerals.

As shown in FIG. 1, the transmitting side of the multiplex transmission method according to the present invention comprises a video capturing means 1, an A / D converting means 2, an image data compressing means 3, and a data capturing means 4. And data processing means 5 and variable-length frame generating means 6
Error correction coding means 7 and data rearranging means 8
, Audio capturing means 9, audio compression encoding means 10, fixed length frame generating means 11, and PHS terminal 12.

As shown in FIG. 2, the configuration of the receiving side in the multiplex transmission method of the present invention includes a PHS terminal 13, a fixed-length frame separating unit 14, and a data re-sorting unit 1.
5, an error correction decoding means 16, a variable length frame separation / disassembly means 17, an audio expansion decoding means 18, an audio reproduction means 19, an image data expansion means 20, a D / A conversion means 21, Display means 22, data processing means 23
And data transmission means 24.

Next, each part of the transmitting side of the present method will be described in detail. The video capturing means 1, A / D converting means 2, and image data compressing means 3 described in the conventional image transmitting method are described below. The description is omitted here because it is completely the same.

The data fetch means 4 fetches various digital data from peripheral devices. Here, examples of various types of digital data include control data of a monitoring camera and remaining battery data of a device when the present method is used for a monitoring device. In the case of connection, the data includes protocol probability data between devices and a data file to be transmitted. The data processing means 5 processes data taken from the peripheral device, control data to the partner terminal, and the like.

The variable-length frame generating means 6 includes the compressed image data from the image data compressing means 3 and the data processing means 5.
Multiplexes the data from the control and data from peripheral devices (hereinafter, referred to as other data) as variable-length frames of a convenient length, and divides the multiplexed data equally. The data is output to the error correction coding means 7 as divided data.

More specifically, as shown in FIG. 3A, the variable-length frame generating means 6 sets a flag (expressed as F in FIG. 3A) at the beginning and end of a frame of compressed image data or other data. ) Is added, and a mark (FIG. 3)
The compressed image data and other data are multiplexed in a variable-length frame using a format of the HDLC procedure of filling with (MARK in (a)).

The multiplexed data is equally divided into n bits or n bytes (n: an arbitrary number, hereinafter described only in units of bits), and the equally divided data (1) and the equally divided data ( 2),... Are output to the error correction coding means 7. FIG. 3 is a format diagram showing a data format in each part of the multiplex transmission method of the present invention, and FIG. 3A shows a format of a variable-length frame multiplexed by the variable-length frame generating means 6.

The error correction encoding means 7 performs the B
The error correction coding is performed using various methods such as a CH coding method, a Reed-Solomon coding method, and a Vidabi coding method, and the coded data is output to the data rearranging unit 8.

Specifically, the error correction encoding means 7
As shown in (b), the n-bit equal division data (1), the equal division data (2),
Error-correction coding is performed on the equally divided data (3),..., And an m-bit (m: any number) check code (FIG.
(Expression CB in (b)) is added, and (n + m) -bit encoded data is output to the data rearranging means 8. FIG. 3B shows the format of data that has been subjected to error correction encoding by the error correction encoding means 7.

The data rearranging unit 8 rearranges the encoded data from the error correction encoding unit 7 in units of bits (bytes) using a rearrangement matrix, and outputs the rearranged data to the fixed-length frame generating unit 11. Is output to Here, the rearrangement matrix is a matrix-like storage unit that can store a plurality of (n + m) -bit fixed-length data output from the error correction encoding unit 7.

Here, a specific data sorting method in the data sorting means 8 will be described with reference to FIG. FIG. 4 is an explanatory diagram showing a data sorting method in the data sorting means 8 of the present invention. N-bit (byte) equally divided data from the variable-length frame generating means 6
(A1) to (An) are output, error-correction-coded by the error-correction coding means 7, and m-bit check codes (AC1) to (ACm)
, And (n + m) -bit fixed-length encoded data (A1) to (An) (AC1) to (ACm) are output to the data rearranging means 8. Similarly, check codes (BC1) to (BC1) are added to the equally-divided data (B1) to (Bn) from the variable-length frame generating means 6.
m) is added to the fixed-length encoded data (B1) to (Bn) (BC
1) to (BCm) are sequentially output.

In the data rearranging means 8, the fixed-length coded data (A1) to (A
n) (AC1) to (ACm), (B1) to (Bn) (BC1) to (BCm)... are sequentially stored in a plurality of columns (10 columns in the example of FIG. 4) in the horizontal direction of the rearrangement matrix. When the storage for the columns is completed, the pattern data representing the head of the rearrangement matrix is output to the fixed-length frame generation means 11, and then the rearranged data (A1) is read out one bit at a time in the vertical direction of the rearrangement matrix. (B1)-(J1) (A2) (B2)-(An) (Bn)-(Jn) (AC1)
(BC1) to (JCm) are output to the fixed-length frame generation means 11.

In the data rearranging means 8, the fixed-length coded data string from the error correction coding means 7 is, for example, one.
Since data cannot be taken out unless the data is accumulated for 0 columns, two sorting matrices are actually provided and switched to be used.

The voice capturing means 9 captures a voice signal to be transmitted. The audio compression encoding means 10 performs compression encoding on the audio signal fetched by the audio fetching means 9, and a commonly known compression encoding method is adaptive difference PCM (ADPCM). ) Method. still,
Since the compression encoding method of the audio signal is not related to the characteristic part of the present invention, the detailed description is omitted here.

The fixed-length frame generating means 11 creates a fixed-length frame from the rearranged data from the data rearranging means 8 and the compressed audio data from the audio compression encoding means 10.

Specifically, the fixed-length frame generating means 11
As shown in FIGS. 3 (c), (d) and (e), the data rearranging means 8
From the rearranged data (1) obtained by dividing the rearranged data from the data in units of (n + m) bits;
The audio (1) obtained by dividing the compressed audio data from 0 in units of k bits is multiplexed by adding a frame header and a frame footer as one fixed-length frame to the PHS terminal 12.
Output.

As a method of creating a fixed-length frame, a method may be employed in which a frame for exclusive use of compressed audio data and a frame for exclusive use of rearranged data are multiplexed as the same fixed-length frame.

The PHS terminal 12 is a transmitting means for transmitting fixed-length frame data output from the fixed-length frame generating means 11. The transmitting means is not limited to the PHS, but may be a transmitting means adapted to various communication paths.

Next, the operation of the transmitting side in the multiplex transmission method of the present invention will be described with reference to FIGS. The operation of the transmitting side in the multiplex transmission method of the present invention is as follows.
Is captured by the video capturing means 1, converted into digital image data by the A / D converting means 2, compressed and encoded by the image data compressing means 3, and the compressed image data is output to the variable-length frame generating means 6. .

On the other hand, data from the peripheral device is fetched by the data fetching means 4 and processed by the data processing means 5.
The data is output to the variable-length frame generating means 6 as other data together with the control data.

Then, in the variable-length frame generating means 6,
Flags are added before and after the compressed image data from the image data compressing means 3 and other data from the data processing means 5 to create a variable-length frame as shown in FIG. , And is output to the error correction encoding means 7 as equal division data.

The equally-divided data in n-bit (byte) units from the variable-length frame generating means 6 is error-correction-coded by the error-correction coding means 7, and as shown in FIG.
An inspection code of m bits (bytes) is added, and (n +
m) The data is output to the data rearranging unit 8 in units of bits (bytes), and the data rearranging unit 8 accumulates a plurality of pieces of encoded data. Is output to

On the other hand, the voice is captured by the voice capturing means 9, compressed and coded by the voice compression coding means 10, and the compressed voice data is output to the fixed-length frame generating means 11.

Then, the fixed-length frame generating means 11 divides the rearranged data from the data rearranging means 8 into (n + m) -bit data and compresses the compressed audio data from the audio compression encoding means 10 by k bits. Each segmented data is multiplexed as one frame, and a frame header and a frame footer are added before and after the frame, so that the PHS terminal 12 transmits the data in frame units.

Next, each part on the receiving side of the present method will be described in detail. However, the image data decompression means 20, the D / A conversion means 21, and the video display means 22 described in the conventional image transmission method are completely different. The description is omitted here because it is the same.

The PHS terminal 13 receives the multiplexed fixed-length frame transmission data transmitted from the PHS terminal 12. If the same PHS terminal 12 is used, full duplex communication in both transmission and reception directions can be realized.

The fixed-length frame separating means 14 performs frame detection on transmission data of the fixed-length frame received by the PHS terminal 13 through means such as frame synchronization and forward protection, and reorders (n + m) bits in the frame. Data and k-bit compressed audio data, and each of them is re-ordered by data reordering means 15 and audio decompression decoding means 18
Is output to

The data rearrangement means 15 uses the data rearrangement matrix having the same size as that of the data rearrangement means 8 to reverse the rearranged data from the fixed-length frame separation means 14 with the data rearrangement means 8. And the data rearranged at the time of transmission is restored.

Here, a specific data rearrangement method in the data rearrangement means 15 will be described with reference to FIG. FIG. 5 is an explanatory diagram showing a data rearrangement method in the data rearrangement means 15 of the present invention. When the rearranged data is input from the fixed-length frame separating unit 14, the data rearranging unit 15 detects the pattern data representing the head of the rearrangement matrix inserted by the data rearranging unit 8, and converts the subsequent data. The data is sequentially stored in the data rearrangement matrix shown in FIG. 5 in the vertical direction.

Then, 10 is added to the data rearrangement matrix.
When the data of column × (n + m) bits are stored, the data is read out in units of (n + m) bits in the horizontal direction and output to the error correction decoding means 16.

Here, in the process of data transmission from the PHS terminal 12 to the PHS terminal 13 via the base station, for example, shadows (A2) (B2) shown in FIG. 5 are given (J2) (A3). (B3) ····························································································································································· / Due to the rearrangement of the data in the above, only a two-bit (byte) error exists in the unit of error correction decoding output to the error correction decoding means 16.

The error correction decoding means 16 is rearranged from the data rearrangement means 15 and returned (n + m).
The bit coded data is subjected to error correction decoding, and the n-bit data is converted into variable-length
7 is output.

The variable-length frame separating / disassembling means 17 separates the equally-divided data error-corrected and decoded by the error-correction decoding means 16 into compressed image data and other data. Output to the means 23.

The data processing means 23 is for processing other data output from the variable length frame separating / disassembling means 17. The data transmission unit 24 transmits (outputs) the data processed by the data processing unit 23 to peripheral devices.

The audio expansion / decoding means 18 expands and decodes the compressed audio data separated and output by the fixed-length frame separation means 14 and outputs an audio signal. The sound reproducing means 19 reproduces sound according to the sound signal from the sound expansion / decoding means 18.

Next, the operation on the receiving side in the multiplex transmission method of the present invention will be described with reference to FIG. The operation of the receiving side in the multiplex transmission method of the present invention is as follows. The transmitted multiplexed data is received by the PHS terminal 13 and is separated into rearranged data and compressed audio data by the fixed-length frame separating means 14. The data is output to the data rearrangement means 15, and the compressed audio data is output to the audio expansion / decoding means 18.

Then, the rearranged data is rearranged by the data rearrangement means 15 and the error correction decoding means 1
The compressed image data is output to an image data decompression unit 20 and the other data is output to a data processing unit 23. Is done.

The compressed image data is decompressed and decoded by the image data decompression means 20, converted into an analog image signal by the D / A conversion means 21, and an image (video) is displayed on the video display means 22.

On the other hand, the other data output from the variable-length frame separating / disassembling means 17 is subjected to data processing by the data processing means 23 and output (transmitted) to the peripheral device by the data transmission means 24.

The compressed audio data output from the fixed-length frame separating means 14 is decompressed and decoded by the audio decompression and decoding means 18, and is output as sound by the audio reproducing means 19.

According to the multiplex transmission method and the multiplex transmission apparatus of the present invention, the compressed image data and control or other data are multiplexed by the variable length frame generating means 6 to create a variable length frame, and the variable length frame is generated. The equally divided data is error-correction-coded by the error-correction coding unit 7 to generate coded data, and the data rearrangement unit 8 stores a plurality of coded data in a matrix and rearranges the data in units of bits (bytes). Since the data is rearranged and decoded by the data rearrangement means 15 on the receiving side, the burst error generated in the transmission process is replaced with a random error by the rearrangement. As a result, error correction is performed. Can improve the efficiency of
This has the effect of improving transmission accuracy.

According to the multiplex transmission method and the multiplex transmission apparatus of the present invention, the rearranged data generated from the compressed image data and other data and the compressed audio data are fixed length frame generation means 11 by the fixed length frame generation means 11. Since the data is multiplexed into a frame, the multiplexed data is finally transmitted in a fixed-length frame, and there is an effect that various frame synchronization protection means can be applied to cope with a transmission error.

[0063]

According to the first aspect of the present invention, a variable-length frame of compression-encoded image data is transmitted on the transmission side.
Multiplex variable-length frames of other data, divide it into specific lengths, perform error correction coding, and rearrange a plurality of error correction coded data in bit units or byte units,
A fixed-length frame is created and transmitted from the rearranged data and the compression-encoded audio data, and the receiving side separates the rearranged data from the received fixed-length frame from the compression-encoded audio data. Then, the rearranged data is restored to the original state, error-correction decoded, and the multiplex transmission method is used to separate and extract the compression-encoded image data and other data from the decoded data. By doing so, by correcting the burst error generated in the transmission process as a random error, the error correction efficiency can be improved, and there is an effect that multiplex transmission can be performed with high accuracy.

According to the second aspect of the present invention, a plurality of coded data subjected to error correction coding are stored in a plurality of columns in the horizontal direction,
2. A multiplex transmission method according to claim 1, wherein a plurality of rearranged data read and rearranged in the vertical direction, received and separated are stored in the vertical direction, read out in the horizontal direction and returned to the original state. By rearranging the data vertically (horizontally) and horizontally (in bytes), the burst errors that occur during the transmission process are dispersed and changed to random errors, thereby increasing the range of error correction, thereby increasing the error correction efficiency. The multiplex transmission can be improved with high accuracy.

According to the third aspect of the present invention, on the transmitting side,
The variable length frame of the compression-encoded image data and the variable length frame of the other data are multiplexed by the variable length frame generation unit and divided into specific lengths, and the error correction encoding unit performs error correction encoding. The encoded data is generated, the data rearranging unit rearranges the encoded data in bit units or byte units to generate rearranged data, and the fixed-length frame generating unit generates the rearranged data and the compression-encoded voice. A fixed-length frame is created from the data and transmitted by the transmitting means. On the receiving side, the receiving means receives the fixed-length frame, and the fixed-length frame separating means separates the rearranged data from the compressed and encoded audio data. The data that has been separated is rearranged by the data rearrangement unit, the error-correction decoding unit performs error-correction decoding, and the variable-length frame separation / disassembly unit is compression-coded. Since it is a multiplex transmission device that separates image data and other data, the data is rearranged and transmitted, so that burst errors that occur during the transmission process are dispersed and corrected as random errors, thereby improving error correction efficiency. The multiplex transmission can be improved with high accuracy.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram on the transmission side of a multiplex transmission method according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration on a receiving side of the multiplex transmission method according to the embodiment of the present invention.

FIG. 3 is a format diagram showing a data format in each part of the multiplex transmission method of the present invention.

FIG. 4 is an explanatory diagram showing a data rearranging method in the data rearranging means of the present invention.

FIG. 5 is an explanatory diagram showing a data rearrangement method in the data rearrangement unit of the present invention.

FIG. 6 is a block diagram illustrating a schematic configuration of a conventional image transmission method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Video capture means 2 ... A / D conversion means, 3 ... Image data compression means, 4 ... Data capture means, 5 ... Data processing means, 6 ... Variable length frame generation means, 7 ... Error correction coding means, 8: Data rearranging means, 9: Voice capturing means, 10: Voice compression encoding means, 11: Fixed length frame generating means, 12: PHS terminal (transmission),
13: PHS terminal (reception), 14: fixed-length frame separation means, 15: data rearrangement means, 16: error correction decoding means, 17: variable-length frame separation and disassembly means,
18 audio decompression decoding means 19 audio reproduction means
20 image data expansion means 21 D / A conversion means
22: video display means, 23: data processing means, 2
4: Data transmission means

Claims (3)

[Claims] 1. A multiplex transmission method for multiplexing and transmitting compression-coded image data, compression-coded audio data, and other data. A variable-length frame and a variable-length frame of other data are multiplexed, the multiplexed data is divided into a specific length and error-correction-coded, and the plurality of error-correction-coded data are divided into bits or bytes. A fixed-length frame is created and transmitted from the rearranged data and the compressed and encoded audio data, and the received data is compression-encoded and rearranged from the received fixed-length frame on the receiving side. Audio data, and the rearranged data is restored to the original data for error correction decoding, and the encoded data and other data are separated from the decoded data. Multiplex transmission method characterized in that the multiplex transmission method comprises: 2. A plurality of coded data subjected to error correction coding are stored in a plurality of columns in a horizontal direction, read and rearranged in a vertical direction, and a plurality of rearranged data received and separated are stored in a vertical direction. 2. The multiplex transmission method according to claim 1, wherein the data is read out in the horizontal direction and returned to the original state. 3. A multiplex transmission apparatus for multiplexing and transmitting compression-encoded image data, compression-encoded audio data, and other data and transmitting the multiplexed image data on the transmission side. A variable-length frame generating unit that multiplexes a variable-length frame and a variable-length frame of other data, divides the multiplexed data into a specific length, and outputs equal-divided data; Error correction coding means for performing correction coding and outputting coded data, data rearranging means for rearranging the plurality of coded data in bit units or byte units, and outputting rearranged data, Fixed-length frame generating means for creating a fixed-length frame from compression-encoded audio data, transmitting means for transmitting the fixed-length frame, and a fixed-length Receiving means for receiving a frame;
Fixed-length frame separating means for separating data rearranged from the fixed-length frame and compression-encoded audio data, data rearrangement means for returning the rearranged data to the original state, and data returned to the original state Error correcting decoding means for error correcting and decoding, and variable length frame separating / disassembling means for separating and taking out compressed image data and other data from the decoded data. Transmission equipment.