JP3365487B2 - Videophone device and its mode setting method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a videophone device that can be used for videoconference, multimedia communication, etc., and a mode setting method for the videophone device.

[0002]

2. Description of the Related Art Conventionally, in this type of videophone device, the operation mode setting of the image and audio compression device is within the range of the image and audio expansion capability of the other terminal obtained as a result of the capability exchange with the other terminal. Was set within.

For example, the 23rd standardization conference material TTC
As shown in the standard (draft) JT-H324, a technique for exchanging capabilities between terminals is described.

FIG. 4 is a block diagram showing an example of a video telephone device shown in JT-H324 as a conventional technique. The conventional ITU-T recommendation, H324 standard videophone device 100 is an MCU (Multipoint Control Unit) 1
15 is connected to a GSTN network (General Switched Telephone Network) 114 such as a telephone line or a leased line controlled by a modem 15 and is controlled by a modem (ITU-T recommendation,
V. 25ter) 113 controlled modem (V.34 /
V. 8) Performs transmission / reception communication with the outside via 112, and multiplexes a plurality of signals in the case of transmission by a multiplexing / separating unit (ITU-T recommendation, H.223: channel multiplexing / synchronized transmission method) 111. , Separate into multiple signals for reception. The videophone device 100 exchanges images, voices, and data with the corresponding videophone device.

Here, when the physical line is established, first, the system control unit 108 uses a control protocol (ITU-T recommendation, H.245: image coding / communication system) 109 to communicate with a partner terminal for videophone communication. Perform capacity exchange procedures between As a result of this capacity exchange, the system control unit 10
8 acquires information about the image and voice expansion capabilities of the partner terminal. Regarding the video I / O device 101, as a result of the capability exchange, the video encoding (ITU-T recommendation H.263 / H.261) 102 causes the system control unit 108 to use the modem (V.3).
4 / V. 8) Perform image compression processing within the range of the image decompression capability of the partner terminal acquired via 112.

Similarly, the audio I / O device 1
03, audio encoding (ITU-T Recommendation, G.
723.1) 104 is system control 1 as a result of capacity exchange.
The voice compression processing is performed within the range of the voice decompression capability of the partner terminal acquired by 08, and the signal is received on the reception path via the delay circuit 105 in synchronization with the video. Further, regarding the user data application 106, the data protocol (V.14, LAPM, etc.) 107 acquires a data rate and transmits / receives at a corresponding rate if the capability can be exchanged with the communication partner. In addition, the system control unit 108
Is a control protocol unit (ITU-T recommendation, H.245).
109 and SRP / LAPM procedure section (SimpleRetransmissi
On Protocol / Link Access Procedures for Modem (Synchronization / Link Control Procedures) 110 and a multiplexer / demultiplexer 111 are used to communicate control system data and capability exchange.

FIG. 5 is a flow chart for explaining the flow of operation in the conventional videophone device 100.

When a videophone call is started (step S10)
1) First, a physical line is established (step S102).
Next, the system control 108 transmits the capability information of the own terminal to the partner terminal (step S103). At the same time, the system control 108 receives the capability information of the partner terminal from the partner terminal (step S104). The video encoding 102 sets the image compression mode within the range of the image expansion capability of the partner terminal (step S105). At the same time, the audio encoding 104 sets the voice compression mode within the range of the voice expansion capability of the partner terminal (step S106).

The video encoding 102 is step S105.
Video I / O device 101 in the image compression mode set in
The compression processing of the image signal input from is started (step S107). At the same time, the audio encoding 104 starts the compression processing of the audio signal input from the audio I / O device 103 in the audio compression mode set in step S106 (step S108).

Multiplexing / separating 111 is used for video coding 102.
Image data and audio encoding input from
4 is multiplexed with the compressed voice data inputted from No. 4, and the obtained multiplexed data is transmitted to the partner terminal (step S
Then, the video / audio communication of the videophone is started (step S110).

An image transmission device for transmitting and receiving image data in spread spectrum communication is disclosed in Japanese Patent Application Laid-Open No. 10-29200.
As disclosed in Japanese Patent Laid-Open No. 70641, it is intended to solve the restriction due to spread spectrum communication regarding the display capability, display resolution, transmission speed, etc. of the partner terminal. Regarding the discrepancy between the transmission compression capability information and the actual compression mode, Not listed.

Further, as a video conference call, Japanese Patent Laid-Open No. 6-
As disclosed in Japanese Patent Publication No. 1989302, this publication intends to use a cartridge in which a main part of a communication control processing means based on a predetermined procedure is detachable, but is different from the problem of the present invention. Is.

A videophone device and a data transmission method are described in Japanese Patent Application Laid-Open No. 8-195948. However, this publication has a low transmission rate and a voice signal is generated even if a communication line in which a transmission error easily occurs is used. It is intended to prevent breaks and to accurately transmit image data, and is characterized by retransmitting data in which a transfer error has occurred according to the frequency of occurrence of the transfer error, which is different from the problem of the present invention. is there.

[0014]

However, the conventional techniques described with reference to FIGS. 4 and 5 described above have a problem in the performance of interconnection between the terminals of the videophone and the terminals of other companies.

That is, as a result of the capability information exchange procedure,
The image and voice compression operation of the own terminal is set according to only the acquired image extension ability and voice extension ability of the partner terminal. Therefore, if the other terminal presented the wrong image expansion and audio expansion capabilities when exchanging capabilities, set the image compression mode and audio compression mode of the own terminal within the range of the image expansion and audio expansion capabilities of the other terminal. However, even if the image compression device and the audio compression device are operated, there is a possibility that the other terminal cannot normally perform image expansion or audio expansion processing.

[0016]

SUMMARY OF THE INVENTION The present invention provides a video telephone apparatus which solves the above-mentioned problems, and an image decompression capability of a partner terminal obtained by exchanging capability information with the partner terminal immediately after the start of communication, In addition to setting the image compression mode and audio compression mode according to the audio decompression ability, the compressed image data actually received from the other terminal, the image of the other terminal from the compressed audio data, and the audio compression mode setting are known. Image compression and audio compression are performed within the mode setting range.

According to the present invention, an analyzing means for analyzing compressed image data and compressed audio data actually received from a partner terminal in a videophone device for transmitting and receiving images and audio,
A mode detecting unit for acquiring the image and audio compression modes of the partner terminal is provided, and the image and audio compression device of the own terminal is set within the range of the mode obtained by the mode detecting unit.

Further, according to the present invention, in a videophone device for transmitting and receiving an image, an analyzing means for analyzing the compressed image data actually received from the partner terminal and an image compression mode setting within the compression setting range of the partner terminal. And setting means for performing.

Further, according to the present invention, in a videophone device for transmitting and receiving voice, an analyzing means for analyzing the compressed voice data actually received from the partner terminal and a voice compression mode setting within the compression setting range of the partner terminal. And setting means for performing.

Further, according to the present invention, in a videophone device for transmitting and receiving an image and a sound, a terminal control for outputting the image expansion capability information and the audio expansion capability information of the communication partner terminal obtained by the capability exchange with the partner terminal. Device, analysis means for analyzing compressed image data and compressed audio data received by the terminal, and image compression device and audio for the terminal according to the image compression mode and audio compression mode of the partner terminal obtained by the analysis means. And a setting means for setting an operation mode of the compression device.

Further, according to the present invention, in the mode setting method of the videophone device for setting the operation mode of the image compression device of the own terminal, the image capability information of the other terminal received from the other terminal after starting the videophone communication. Detected, the received compressed image data received from the other terminal is expanded by the image expansion device, and at the same time, the operation mode information of the image compression device of the other terminal is detected from the received compressed image data,
Image compression is performed by the image compression device of the terminal itself within the range of the image capability information and the operation mode information.

Further, according to the present invention, in the mode setting method of the videophone device for setting the operation mode of the voice compression device of the own terminal, the voice capability information of the other terminal received from the other terminal after the videophone communication is started. Within the range of the voice capability information and the operation mode information, the voice compression data received from the partner terminal is detected and the voice decompressor decompresses the operation mode information at the same time. Is characterized in that the voice compression device of the own terminal performs voice compression.

[0023]

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

[Configuration of this Embodiment] FIG. 1 is a block diagram showing the configuration of the videophone device according to this embodiment. In the figure, 1 is a public telephone line or a private line,
Alternatively, reference numeral 2 denotes a videophone device connected to an internet line or the like, 2 is a video camera for photographing a conference hall or a person talking, and 3 is an image for compressing a video signal or a captured image signal from the video camera 2. Compressor 4 is a microphone that collects the voice of the conference hall and the voice of the person speaking,
Reference numeral 5 is an audio compression device for audio compression of the audio signal from the microphone 4, 6 is a display such as a cathode ray tube, a flat panel, a liquid crystal device or the like for displaying the imaged image signal of the other party,
Is an image decompressing device that decompresses the compressed image signal of the other party and outputs the image compression mode setting information of the other party to the image compressing device 3, and 8 is a speaker including earphones or headphones that outputs the sound signal of the other party, Reference numeral 9 denotes a voice decompressor that decompresses the compressed voice signal of the other party and outputs compression mode setting information of the compressed voice signal of the other party to the voice compression device 5 .

In addition, 10 aligns the image compression device 3 and the audio compression device 5 according to the capability information of the other side, and
A terminal control device 11 for controlling the entire videophone device multiplexes the compressed signals of the image compression device 3 and the audio compression device 5 and sends them out, and the multiplexed image compression signal and audio compression of the other side from the line. A multiplexing / restoring device 12 for separating and restoring signals is a line interface such as a modem, a terminal adapter, a router connected to a public line network or a dedicated line network.

Although not shown in this configuration, data, facsimile data, etc. are generated and transmitted, data from the other party is acquired, and the image transmitted by connecting to the facsimile is output. The video conference may be activated by utilizing not only voice and images but also multimedia such as various data.

Referring to FIG. 1, the video camera 2 outputs a captured image signal. The image compression device 3 is the terminal control device 1.
The image decompression capability information of the partner terminal is input from 0, the image compression mode setting information of the partner terminal is input from the image expansion device 7, and the captured image signal is input from the video camera 2, and the compressed image signal is output.

The microphone 4 also outputs a voice signal. The voice compression device 5 inputs the voice decompression capability information of the partner terminal from the terminal control device 10, the voice compression mode setting information of the partner terminal from the voice decompression device 9, and the voice signal from the microphone 4, and outputs the compressed voice signal. . The image decompression device 7 inputs the compressed image signal of the partner terminal from the multiplexing / decompression device 11, outputs the decompressed image signal to the display 6, and simultaneously displays the image compression mode setting information obtained from the compressed image signal of the partner terminal. Output to the compression device 3. The display 6 displays the expanded image signal output by the image expansion device 7.

The voice decompressor 9 inputs the compressed voice signal of the partner terminal from the multiplexer / decompressor 11 and outputs the decompressed voice signal to the speaker 8, and at the same time, compresses the voice obtained from the compressed voice signal of the partner terminal. The mode setting information is output to the audio compression device 5. The speaker 7 reproduces the expanded audio signal output by the audio expansion device 9.

The multiplexing / decompression device 11 also includes a compressed image signal input from the image compression device 3 and an audio compression device 5.
The compressed voice signal input from the terminal control device 10 and the terminal control information including the own terminal capability information input from the terminal control device 10 are multiplexed, and the multiplexed data is output to the line interface 12. Further, the multiplexed data of the partner terminal inputted from the line interface 12 is subjected to the multiplexing and decompression processing, the compressed image data is supplied to the image expansion device 7, the compressed audio data is supplied to the voice expansion device 9, and the capability information of the partner terminal is displayed. The included terminal control information is output to the terminal control device 10, respectively.

The line interface 12 is multiplexed and
The multiplexed data is input from the decompression device 11, the multiplexed data is output to the partner terminal via the line, and at the same time, the multiplexed data is input from the partner terminal via the line and the multiplexed data is output to the multiplexing / decompression device 11. To do. The terminal control device 10
The terminal control information including the capability information of the own terminal is output to the multiplexing / restoring device 11, and at the same time, the partner terminal control information including the capability information of the partner terminal is input from the multiplexing / restoring device 11. Further, based on the input capability information of the partner terminal, the image decompression capability information of the partner terminal is sent to the image compression device 3.
The voice expansion capability information of the partner terminal is output to the voice compression device 5, respectively.

[Description of Operation of the Present Embodiment] Next, the operation of the block diagram of FIG. 1 will be described with reference to the drawings.

First, a physical line connection is established between the video telephone 1 and the other terminal via the line to establish a data line. Next, the terminal control device 1 of the videophone device 1
0 and the terminal control device of the partner terminal exchange capability information of their own terminals. The terminal control device 10 outputs, to the multiplexing / restoration device 11, terminal control information including information on the image expansion capability of the terminal itself and information on the audio expansion capability. The multiplexing / restoring device 11 outputs the terminal control information output from the terminal control device 10 to the line interface 12, and the line interface 12 transmits the multiplexed data including the terminal control information of the own terminal to the partner terminal via the line. To send. At the same time, the line interface 12 receives the multiplexed data including the terminal control information of the partner terminal, which is received from the partner terminal, and the multiplexing / restoration device 1
Output to 1. The multiplexing / restoring device 11 sends multiplexed data including terminal control information of the partner terminal to the line interface 1
When it is received from 2, the terminal device 10 performs the multiplexing restoration process and outputs the terminal control information of the partner terminal to the terminal control device 10. With this, the terminal control device 10 can know the capability information of the partner terminal.

The terminal control device 10 outputs the image expansion capability information of the partner terminal to the image compression device 3 based on the input capability information of the partner terminal. The image compression device 3 sets the operation mode of image compression based on the image expansion capability information of the partner terminal output by the terminal control device 10. Here, the image compression operation mode is set within the range of the image expansion capability information of the partner terminal. At the same time, the terminal control device 10 outputs the voice expansion capability information of the partner terminal to the voice compression device 5 based on the input capability information of the partner terminal. The voice compression device 5 sets a voice compression operation mode based on the voice expansion capability information of the partner terminal output from the terminal control device 10.
Here, the voice compression operation mode is set within the range of the voice decompression capability information of the partner terminal.

In this way, when the capability is exchanged with the partner terminal and the operation mode is set to the image compression apparatus 3 and the audio compression apparatus 5 of the own terminal, the transmission of the image and the audio is started. . The image compression device 3 compresses the captured image signal input from the video camera 2 and starts outputting compressed image data to the multiplexing / decompression device 11. Similarly, the audio compression device 5 compresses the audio signal input from the microphone 4 and starts outputting compressed audio data to the multiplexing / decompression device 11. The compressed image data and the compressed audio data input to the multiplexing / decompression device 11 are subjected to a multiplexing process and transmitted to the partner terminal via the line interface 12.

Next, the line interface 1 from the partner terminal
The multiplexed data received via 2 is subjected to a multiplexing / decompression process by the multiplexing / decompression device 11 to obtain compressed image data and compressed audio data transmitted by the partner terminal. The obtained compressed image data is output to the image expansion device 7, and the compressed audio data is output to the audio expansion device 9. The image decompression device 7 decompresses the input compressed image data of the partner terminal, and the resulting decompressed image signal is drawn by the display 6 to display the image on the partner terminal side. Further, the audio decompression device 9 decompresses the input compressed voice data of the other terminal, and the obtained decompressed voice signal is reproduced and output by the speaker 8 to reproduce the voice of the other terminal.

Here, the image decompressing device 7 analyzes the mode of the compressed image data when decompressing the compressed image data received from the partner terminal. That is, the mode setting such as the extension setting in the image compression device of the partner terminal is known from the received image compression data. The image decompression device 7 outputs the found image compression mode setting information of the partner terminal to the image compression device 3. The image compressing device 3 includes the other terminal image decompressing capability information obtained by the terminal control device 10 by exchanging the capability with the other terminal,
The image compression mode is set within the range of the image compression mode setting information of the partner terminal obtained by the image expansion device 7, and the image signal is compressed.

Similarly, the voice decompressor 9 analyzes the mode of the compressed voice data when decompressing the compressed voice data received from the partner terminal. That is, the mode setting such as the extension setting in the voice compression device of the partner terminal is known from the received voice compression data. The found voice compression mode setting information of the other terminal is output to the voice compression device 5 of the own terminal. The voice compression device 5 includes the voice compression capability information of the partner terminal obtained by the capability exchange with the partner terminal by the terminal control device 10,
The voice compression mode is set within the range of the voice compression mode setting information of the partner terminal obtained by the voice expansion device 9, and the voice signal is compressed.

By performing these operations, the image compression apparatus and the audio compression apparatus of the own terminal are within the range of the image expansion capability and the audio expansion capability of the partner terminal and the image compression mode and the audio compression mode of the partner terminal. A compression process will be performed. Generally, at least the connectivity is established between the videophone devices of its own company, so that the image and audio compression capability is not set beyond the image and audio decompression capability. Therefore, by setting the compression mode setting of the image and the sound within the range of the mode analyzed from the compressed image data and the compressed sound data of the partner terminal, the compressed image data and the compressed sound data are surely transmitted in the partner terminal that is interconnected. You will be able to play the drawing.

FIG. 2 is a diagram for explaining the operation mode setting of image compression in the videophone terminal 1.

In FIG. 2, the image compression mode 23 finally set in the image compression device of the terminal itself is known to the terminal control device 10 by the image compression capacity 20 originally possessed by the terminal itself and the capacity exchange between the terminals. Image expansion capability of the other terminal 21
And the image compression capacity 22 of the partner terminal known from the received compressed image data (the shaded portion in FIG. 2).

FIG. 3 is a flow chart for explaining the flow of operations in the videophone terminal 1. The operation of the present videophone device will be described with reference to FIG.

First, when a videophone is started (step S1), a physical line is first established (step S2). Next, the terminal control device 10 transmits the capability information of the own terminal to the partner terminal via the multiplexing / restoration device 11 and the line interface 12 (step S3). Terminal control device 10
Receives the capability information of the partner terminal from the partner terminal via the line interface 12 and the multiplexing / restoring device 11 (step S4). The image compression device 3 sets the image compression mode within the range of the image decompression capability of the partner terminal input from the terminal control device 10 (step S5). At the same time, the voice compression device 5 sets the voice compression mode within the range of the voice decompression ability of the partner terminal input from the terminal control device 10 (step S6).

Next, the multiplexing / restoring device 11 receives the multiplexed data of the partner terminal via the line interface 12, and performs the multiplexing / demultiplexing process on the compressed image data and the compressed audio data, respectively (step S7). The image decompression device 7 decompresses the multiplexed and separated compressed image data, and at the same time, acquires the image compression mode setting of the partner terminal by analyzing the compressed image data (step S8). Further, the voice decompression device 9 decompresses the multiplexed and separated compressed voice data, and at the same time, acquires the voice compression mode setting of the partner terminal by analyzing the compressed voice data (step S).
9).

The image compression apparatus 3 newly sets the image compression mode within the range of the image compression mode set in step S5 and the image compression mode of the partner terminal acquired in step S8 (step S10). Similarly, the voice compression device 5 newly sets the voice compression mode within the range of the voice compression mode set in step S6 and the voice compression mode of the partner terminal acquired in step S9 (step S11). . Then, the image compression device 3 starts compression processing of the image signal input from the video camera 2 (step S12), and similarly, the audio compression device 5 starts compression processing of the audio signal input from the microphone 4. (Step S13).

Next, the multiplexing / restoring device 11 multiplexes the compressed image data input from the image compression device 3 and the compressed audio data input from the audio compression device 5, and the obtained multiplexed data is obtained. Is transmitted to the other terminal via the line interface 12 (step S14), thereby starting the image / voice communication of the videophone (step S1).
5). After that, the communication system such as the videophone device actually operates, and it is possible to utilize a smooth videoconference without inconvenience to the user, and it is possible to improve the connection performance in the mutual connection between other companies.

A specific example of the image compression mode 23 set in the image compression device of the own terminal shown in FIG. 2 will be described. In the operation mode setting of the image compression in the videophone terminal 1, the image compression / decompression (ITU-T recommendation,
H. 263) has the following capabilities, for example. (A) Extended prediction mode: a mode in which overlap block motion compensation (OBMC) is used for a luminance signal of a P picture, (b) Arithmetic coding mode: also called sync-tack arithmetic coding mode, instead of variable coding. Mode using arithmetic coding, (c) unlimited motion vector mode: effective when camera has motion, and mode in which motion vector is allowed to point outside of picture (d) PB frame mode: previous P picture There is a mode in which a B picture interpolated from the next P picture is generated and the picture rate can be increased without increasing the bit rate too much.

Therefore, in the frame shown in FIG. 2, the image compression capacity 20 of the own terminal which can be known by the own terminal is described in the above (a).
(A) to (c), and the image compression capacity of the partner terminal to be known from the received compressed image data is set to (a) ( b) and (d), the image compression mode 23 set in the image compression device of the own terminal is the extended prediction mode of (a) and the arithmetic coding mode of (b), as shown by the hatched portion in FIG. Become. In this way, the capabilities of the own device and the capabilities of the partner device are communicated with each other, and communication is possible with the mutual optimum, that is, the maximum value of the capabilities possessed by each other.

In each of the above-mentioned embodiments, the compression / expansion mode by the image and voice is explained, but also for multimedia such as data transmission and facsimile transmission, the transmission rate of data and the G3 and G4 modes of facsimile are set. The present invention can be applied.

[0050]

According to the present invention, the image compression mode and the audio compression mode can be set according to the image decompression capability and the voice decompression capability of the partner terminal obtained by the capability exchange with the partner terminal performed immediately after the start of communication. Not only does it work, but it knows the image of the other terminal and the audio compression mode setting from the compressed image data and compressed audio data actually received from the other terminal, and performs image compression and audio compression within the range of this mode setting. Improves connection performance in interconnecting equipment between other companies.

The image and voice compression modes of this partner terminal are
Generally, because the connectivity between the other terminals is guaranteed,
It does not exceed the image and voice expansion capabilities of the other terminal. Therefore, if the image and the audio compression mode of the own terminal are set within the range of the image and the audio compression mode of the other terminal, the interoperability between the own terminal and the other terminal is compensated.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment according to the present invention.

FIG. 2 is a diagram illustrating an operation mode setting of the image compression apparatus according to the embodiment of the present invention.

FIG. 3 is a flow chart for explaining the operation of this embodiment according to the present invention.

FIG. 4 is a block diagram showing a conventional videophone device.

FIG. 5 is a flowchart showing a conventional videophone device.

[Explanation of symbols]

1,100 Videophone device 2 Video camera 3 Image compression device 4 Microphone 5 Audio compression device 6 Display 7 Image expansion device 8 Speaker 9 Audio expansion device 10 Terminal control device 11 Multiplexing / restoration device 12 Line interface 20 Image compression of own terminal Capability 21 Image compression capability of the other terminal that is known by exchanging capabilities between terminals 22 Image compression capability of the other terminal that is known from the received compressed image data 23 Image compression mode set in the image compression device of the own terminal 101 Video I / O device 102 Video code 103 Audio I / O device 104 Audio encoding 105 Reception path delay circuit 106 User data application 107 Data protocol 108 System control 109 Control protocol 110 SRP / LAPM procedure 111 Multiplexing / separating circuit 112 Modem 113 Modem control 114 GSTN network 115 MCU

Claims (6)

(57) [Claims] 1. Image data and audio data are transmitted to the other party's
For the videophone device that sends and receives with the Levi phone device
The image compression method that compresses the image data input on the device side.
And a voice compressor that compresses the voice data input on the device side.
And receiving the capability information from the other party's videophone device.
To expand the image of the other party's videophone device.
Control means for obtaining capability information and voice decompression capability information, and compressed image sent from the other party's videophone device
Decompresses the data and includes it in the compressed image data
Image decompression means for acquiring image compression mode setting information
And the compressed audio sent from the other party's videophone device
Decompresses the data and includes it in the compressed audio data
Voice decompression means for acquiring voice compression mode setting information
When, wherein the image compressing means, indicated by the image decompression capability information
Depending on the image compression mode setting information
The image data is compressed, and the audio compression means is indicated by the audio decompression capability information.
Of the audio compression mode setting information
It is shown that the compression of the audio data is performed.
Characteristic videophone device. 2. The image data is transmitted to a videophone device of the other party.
In a videophone device that sends and receives data between devices, an image compression device that compresses the image data input on the device side.
And receiving the capability information from the other party's videophone device.
To expand the image of the other party's videophone device.
Control means for obtaining capability information and compressed image sent from the other party's videophone device
Decompresses the data and includes it in the compressed image data
Image decompression means for acquiring image compression mode setting information
When, wherein the image compressing means, indicated by the image decompression capability information
Depending on the image compression mode setting information
It is shown that the compression of the image data is performed.
Characteristic videophone device. 3. The voice data is sent to the other party's videophone device.
In a videophone device that sends and receives data between devices, a voice compression method that compresses the voice data input on the device side.
And receiving the capability information from the other party's videophone device.
To expand the voice of the other party's videophone device.
Control means for obtaining capability information and compressed voice sent from the other party's videophone device
Decompresses the data and includes it in the compressed audio data
Voice decompression means for acquiring voice compression mode setting information
When, wherein the voice compression means, indicated by the audio expanding capability information
Of the audio compression mode setting information
It is shown that the compression of the audio data is performed.
Characteristic videophone device. 4. The image data and audio data are transmitted to the other party's
How to make a videophone call to and from the Levi phone
Te, image compression scan for compressing image data input by the own device side
And the audio compression block that compresses the audio data input on the device itself.
And its capability information from the other party's videophone device.
To expand the image of the other party's videophone device.
Control step for obtaining capability information and voice decompression capability information, and a compressed image sent from the other party's videophone device
Decompresses the data and includes it in the compressed image data
Image decompression step to obtain the image compression mode setting information.
And the compressed audio sent from the other party's videophone device.
Decompresses the data and includes it in the compressed audio data
Audio compression mode setting information
Comprising a flop, wherein the image compression step, by the image decompression capability information
In the image compression mode setting information of the modes shown
Therefore, the image data is compressed, and the audio compression step is performed by the audio decompression capability information.
In the audio compression mode setting information of the modes shown
Therefore, the audio data is compressed.
And a videophone method characterized by. 5. The image data is sent to a videophone device of the other party.
In the videophone method of transmitting and receiving data between two devices, an image compression system that compresses the image data input on the device side.
And its capability information from the other party's videophone device.
To expand the image of the other party's videophone device.
Control step for obtaining capability information and compressed image sent from the other party's videophone device
Decompresses the data and includes it in the compressed image data
Image decompression step to obtain the image compression mode setting information.
Comprising a flop, wherein the image compression step, by the image decompression capability information
In the image compression mode setting information of the modes shown
Therefore, it is necessary to compress the image data.
And a videophone method characterized by. 6. The voice data is sent to a videophone device of the other party.
In the videophone method of transmitting and receiving data between the two devices, an audio compression stream that compresses the audio data input on the device side.
And its capability information from the other party's videophone device.
To expand the voice of the other party's videophone device.
Control step for obtaining capability information and compressed voice sent from the other party's videophone device
Decompresses the data and includes it in the compressed audio data
Audio compression mode setting information
Comprising a flop, said voice compression step, by the audio expanding capability information
In the audio compression mode setting information of the modes shown
Therefore, the audio data is compressed.
And a videophone method characterized by.