JPH07203079A - Multimedia communication equipment - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide an inexpensive multimedia communication device capable of suppressing wasteful consumption of a recording medium of received information in the automatic recording mode, performing optimal communication, and inexpensive. [Structure] In a multimedia communication device, the type of media information to be communicated with a partner is judged, and when the media information from the partner is audio information and video information including a moving image, the audio information is used as a recording unit. When the analog storage unit 106 that stores the video information and the video information in synchronization with each other is selected and the media information from the other party is audio information,
The voice analog storage unit 118 is selected as the recording unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multimedia communication device such as a videophone device and an AV (Audio Visual) communication device used in a video conference system.

[0002]

2. Description of the Related Art In recent years, a communication service using an ISDN line has been started, and AV services such as a videophone and a video conference system using such a digital line have been receiving attention.

[0003] With the start of this AV service, CCITT Recommendation H.264 provides service specifications, protocol specifications, multimedia multiplexing frame structure specifications, moving image information coding methods, etc. for the AV service. 320, H.M. 242, H.H. Two
21, H.H. 230, H.H. It has been recommended as 261 or the like.

Next, according to this Recommendation H.264. 221 will be described with reference to the drawings. FIG. 10 shows CCITT Recommendation H.264 for 64 kbps 1 channel. FIG. 11 is a diagram showing a frame structure defined in H.221, and FIG. 11 is a diagram showing bit assignment between 1 multiframe = 8 multiframes (1 subframe = 2 frames) of FAS.

Recommendation H. In 221, 64 kbps ~ 1920
The frame structure in the AV service on the kbps channel is specified. Recommendation H.64 in 1 channel at 64 kbps The frame structure defined in 221 is shown in FIG.
As shown in FIG. 3, each frame has a structure of 80 octets. The numbers 1 to 8 on the horizontal axis indicate bit numbers, and the numbers 1 to 80 on the vertical axis indicate octet numbers. As shown in FIGS. 10 and 11, FAS indicates a frame synchronization signal, and by this signal, control of frame synchronization and multi-frame synchronization, a communication quality monitoring function,
Control such as alarm information notification is performed.

On the other hand, BAS indicates a bit rate allocation signal, which is used to perform terminal capability, allocation specification of bit rate for each medium in an actual frame, and various other controls and notifications. As shown in FIG. 11, the BAS is transmitted in even frames and the corresponding error correction bits are transmitted in odd frames.

Recommendation H. In 242, procedures such as a capability information exchange sequence using an in-channel BAS between AV terminals and a mode switching sequence are specified.

Recommendation H. In 320, the system aspect of the entire AV service is defined.

Recommendation H. In 230, various controls and notifications that require transmission frame synchronization or an emergency response are specified as additional information for functions required for AV services.

Recommendation H. 261, px64kbps (p =
The coding / decoding method of moving image information at the speed of 1 to 30) is defined.

Next, a basic sequence relating to execution of multimedia communication of video, audio, data (all user information other than video and audio) according to the above-mentioned recommendation will be described with reference to the drawings. FIG. 12 is a flowchart showing a basic sequence regarding execution of multimedia communication of video, audio, data (all user information other than video and audio) according to CCITT recommendation.

First, when a multimedia communication device (hereinafter referred to as a calling side device) for which communication is desired to be started is activated, out channel call control is activated in response to this activation, and the receiving side device is notified of the incoming call. When using an ISDN line,
The Dch call setup sequence is activated.

In the receiving side device, as shown in FIG. 12, first, step S1 is executed. In step S1, it is determined whether the incoming call is a videophone call. For ISDN line, BC in setup message on Dch call control
(Transmission capability) information element, HLC (higher layer compatibility) information element, LLC (lower layer compatibility) information element, etc. are used to determine whether the call is a telephone call, a videophone call, or a completely different call.

When it is determined that the call is a videophone call, step S2 is executed. In step S2, the Dch call is set and the first connection is established.

Then, step S3 is executed. In step S3, the set connection (ISDN:
(Corresponding to Bch, Hch, etc.), frame synchronization is established by FAS search and detection, and transmission and detection of A bit = 0. After synchronization is established, step S
4 is executed, and in step S4, the capability of the partner device is determined by the capability information exchange sequence by the capability BAS transmission / reception detection.

Next, step S5 is executed. In step S5, multimedia multiplexing allocation in the first connection is determined, a mode switching sequence is performed by transmitting and receiving a BAS command, and multimedia multiplex communication is started. In fact, in this case, there are many sequences in which only voice reception is performed when the additional connection is continuously established. For example, voice 56 kbps, H.264. 261 video O
Communication is started based on the FF mode.

After the communication is started, step S6 is executed. In step S6, it is determined whether or not the own connection device and the other connection device have the ability to set the additional connection. When it is determined that the setting ability of the additional connection exists in the own device and the partner device, step S7 is executed, and in step S7,
Establish additional connections.

Then, step S8 is executed. In step S8, FAS search and detection of the additional connection and establishment of frame synchronization, multiframe synchronization and synchronization establishment with the first channel are performed using the A bit.

After the synchronization establishment process is completed, it is determined again in step S6 whether or not there is a need to add an additional connection.

When there is no need for additional connections, step S9 is executed. In step S9, an operation mode suitable for using all channels is determined, and a mode switching sequence is performed by mode switching by transmitting and receiving a BAS command. , H .; 261 video ON, audio coding is changed to optimal coding between both terminals, and multimedia multiplex communication is performed. Note that the BA performed in step S9
The mode switching sequence by the S command can be performed every time immediately after the synchronization is established for each additional connection (step S8).

In the videophone, AV conferencing apparatus or system, unlike the normal voice recording mode in which only the voice information of the telephone is recorded, if the multiplexed voice information and video information during transmission are simply recorded as they are, reproduction is performed. Since it cannot be done well, it is not possible to adopt a method of simply recording the information received from the transmission path.

Therefore, as one of the alternatives to the above-mentioned method of recording the received information, an analog video / audio storage medium such as a VTR is used to transmit the audio and video of its own side,
There is a method of accumulating received voice and video. In addition, as another method, the audio and video on the local side are recorded as digital information in HD.
There is a method of transmitting from a (hard disk), a MOD (optical magnetic disk), etc., and storing the received audio and video as digital information in HD, MOD, etc. before decoding and analog conversion.

[0023]

However, the above-mentioned VTR
In the former method of using analog storage media such as, when receiving audio information in the telephone mode or receiving audio information containing very little video information in the videophone mode, it is recorded on the recording medium for video information. Most of the information that is recorded becomes voice information, and the recording medium is wasted.

In the latter method using a digital storage medium such as HD, when the moving image information is stored, the capacity required for the storage becomes very large and the cost becomes high.

An object of the present invention is to provide an inexpensive multimedia communication device capable of suppressing wasteful consumption of a recording medium for receiving information in the automatic recording mode, performing optimum communication, and inexpensive. .

[0026]

A multimedia communication apparatus according to the first invention of the present application is a means for receiving multiplexed multimedia information via a line and separating the received multimedia information for each predetermined media information; And automatically recording the media information separated by the separating means according to the type.

A multimedia communication device of the second invention of the present application is a storage means for storing a plurality of types of transmission data for response, a means for receiving received media information via a line, and a result of reception by the receiving means. And a selection unit that selects the transmission data for response based on the result of the determination made by the determination unit.

According to the third invention of the present application, a demultiplexing means for receiving the multiplexed multimedia information via a line and demultiplexing each predetermined media information, and the reception is automatically accepted and demultiplexed by the demultiplexing means. A multimedia communication device having automatic recording means for automatically recording media information according to type, and switching means for switching setting and cancellation of the automatic recording means, wherein the switching means switches the switching means. It has a changing means for changing the communication capability of the multiplexed multimedia information.

[0029]

In the multimedia communication device of the first invention of the present application,
The demultiplexing means receives the multiplexed multimedia information via the line, separates it into predetermined media information, the automatic recording means automatically accepts the reception, and the type of the media information separated by the demultiplexing means Record automatically according to. Therefore, it is possible to suppress wasteful consumption of the recording medium of the received information in the automatic recording mode, perform optimum communication, and be inexpensive.

In the multimedia communication device of the second invention of the present application, a plurality of types of response transmission data are stored in the storage means, the reception means receives the reception media information via the line, and the selection means receives the reception media information. The type of the media information is determined according to the result of the reception of, and the selecting means selects the transmission data for response based on the result of the determination by the determining means. Therefore, it is possible to suppress wasteful consumption of the recording medium of the received information in the automatic recording mode, perform optimum communication, and be inexpensive.

In the multimedia communication device of the third invention of the present application, the communication capacity of the multiplexed multimedia information is changed by the changing means according to the switching of the switching means. Therefore, it is possible to suppress wasteful consumption of the recording medium of the received information in the automatic recording mode, perform optimum communication, and be inexpensive.

[0032]

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

(First Embodiment) FIG. 1 is a block diagram showing the configuration of a first embodiment of a multimedia communication device according to the present invention.

As shown in FIG. 1, the multimedia communication device of this embodiment comprises a line interface section 17 connected to an ISDN line 19. The line interface unit 17 controls the line based on the ISDN user / network interface. The line demultiplexing unit 16 is connected to the line interface unit 17.

The demultiplexing unit 16 uses the CCITT recommendation draft H.264. 221, an audio signal from the audio encoding / decoding unit 5, a video signal from the video encoding / decoding unit 11,
The data from the data interface unit 13, the data from the system control unit 15, and the CCITT draft recommendation H.264. Two
21, H.M. Control information such as 242 is multiplexed on a transmission frame basis, and a reception frame is separated into each medium of a constituent unit, and an audio encoding / decoding section 5, a video encoding / decoding section 11, a data interface section 13, Notify the system control unit 15.

The voice encoding / decoding unit 5 receives 64 kbps PCM A-I AW, 64 based on an instruction from the system control unit 15.
kbps PCM μ-lAW, 64kbps / 56kbps / 48kbps
SB-ADPCM, 32kbps ADPCM, LD-CE
It encodes and decodes audio signals such as LP 166 kbps and 8 kbps. The voice encoding / decoding unit 5 is connected to the voice interface unit 4. The voice interface unit 4 performs a switching process for switching each of the handset 1, the microphone 2, the speaker 3, and the VTR 6 which constitute the voice input / output unit based on an instruction from the system control unit 15, and whether the handset 1 is in an on-hook state or an off-hook state. On / off hook detection processing for detecting whether or not the state is present, and echo cancellation processing for canceling echo when the microphone 2 and the speaker 3 are used as the voice input / output means.

The video encoding / decoding unit 11 uses the CCIT
H.T Recommendation Draft Based on H.261, the transmission video is encoded and the reception video is decoded. Video encoding / decoding unit 11
A video interface unit 10 is connected to the. The video interface unit 10 performs switching processing of video input means, switching processing of input video, received video, and operation screen based on an instruction from the system control unit 15, and video signal combination for displaying them on the display unit 9. Perform processing, etc.
As the video input means, a camera 7 for inputting a self-portrait, a document camera 8 for inputting a picture, a drawing and the like and a V
TR6 and are used. The display unit 9 displays an input image from the camera 7 or the document camera 9, a received image from the other party,
Display the operation screen, etc.

The data interface section 13 includes a data terminal 12 for transmitting and receiving data and a system control section 15.
The transmission data from the device is notified to the demultiplexing unit 16 and the received data is notified to the data terminal 12 or the system control unit 15.

The system controller 15 includes a CPU, a ROM,
It has a RAM and auxiliary storage device, etc., controls the entire device while monitoring the status of each part, calculates the transmission rate allocated to each media based on the input control information, line status used, etc. and determines and controls the final mode. , Create operation / display screens according to the status, and execute application programs.

The operation unit 14 and the storage unit 18 are connected to the system control unit 15. The operation unit 14 is composed of a keyboard for inputting control information for controlling the entire device. The storage unit 18 stores various control information and audio / video information.

Next, the flow of the audio signal and the video signal of the multimedia communication device of this embodiment will be described with reference to FIG. FIG. 2 is a block diagram for explaining the flow of audio signals and video signals of the multimedia communication device of FIG.

The analog voice signal transmitted and the analog voice signal read from the analog storage unit 106 or the voice analog storage unit 118 are analog voice I / F unit 101.
Entered in. The analog audio I / F unit 101 controls the input of the analog audio signal and the output of this analog audio signal.

The analog storage unit 106 stores the analog voice signal from the VTR or the like through the analog voice I / F unit 101 while keeping the synchronization, and stores the analog voice I / F.
An analog audio signal is output in synchronization with the unit 101. Similarly, an analog video signal from a VTR or the like is stored in the analog storage unit 106 via the analog video I / F unit 111, which will be described later, in synchronization with the analog video I / F unit 111.
The data is read from the analog storage unit 106 in synchronization with the F unit 111.

The audio analog storage unit 118 is composed of a microcassette for accumulating and reproducing analog audio.

The analog audio signal output from the analog audio I / F unit 101 is given to the A / D conversion unit 102.

The A / D conversion unit 102 uses the analog voice I / D.
The analog voice signal from the F unit 101 is converted into a digital voice signal. The digital audio signal from the A / D conversion unit 102 is given to the audio encoding unit 103.

The voice encoder 103 is an A / D converter 102.
To encode the digital audio signal from the audio signal or the decoded audio signal from the audio decoding unit 105 to generate an audio encoded signal. The voice encoded signal from the voice encoding unit 103 is given to the digital storage unit 112 and the multiplexing unit 113.

The digital storage unit 112 is the voice encoding unit 10.
Store the encoded audio signal from H.3. The digital storage unit 112 stores the encoded audio signal in MOD or HD.
It is recorded in a storage medium such as.

The transmitted analog video signal or the analog video signal read from the analog storage unit 106 is input to the analog video I / F unit 111. The analog video I / F unit 111 controls the input of the analog video signal and the output of the analog video signal. Analog video I /
The analog video signal output from the F section 111 is given to the A / D conversion section 107.

The A / D conversion section 107 is used for analog video I / D.
The analog video signal from the F unit 111 is converted into a digital video signal. The digital video signal from the A / D conversion unit 107 is given to the digital video processing unit 115.

The input of the digital video signal from the A / D converter 107 to the digital video processor 115 is controlled by the frame memory 117.

The digital video processing unit 115 performs a synthesis / editing process on each digital video signal.

The video encoding unit 108 encodes the digital video signal from the digital video processing unit 115 to generate a video encoded signal. The video coded signal from the video coding unit 108 is given to the multiplexing unit 113.

The multiplexing unit 113 includes a system control unit 15
Speech encoding unit 103 based on an instruction from (shown in FIG. 1)
The audio coded signal from the video coding unit 108 and the video coded signal from the video coding unit 108 are multiplexed, and the line interface unit 17
(Shown in FIG. 1).

The received signal from the line interface unit 17 is given to the separating unit 114. The demultiplexing unit 114 demultiplexes the received signal from the line interface unit 17 into a voice coded signal and a video coded signal. The audio coded signal is provided to the audio decoding unit 105, and the video coded signal is provided to the video decoding unit 110.

Speech decoding section 105 decodes the speech coded signal from demultiplexing section 114 and the speech coded signal from digital storage section 112 into a digital speech signal. The digital audio signal from the audio decoding unit 105 is the D / A conversion unit 1
Given to 04. The D / A conversion unit 104 converts the digital audio signal from the audio decoding unit 105 into an analog audio signal.

The analog voice signal from the D / A converter 104 is output via the analog voice I / F unit 101.

The video decoding unit 110 decodes the coded video signal into a digital video signal. Video decoding unit 110
The digital video signal from the digital video processing unit 115
Given to.

The digital video processing unit 115 includes the digital video signal from the A / D conversion unit 107 and the video decoding unit 11.
A synthesis / editing process is performed using a digital video signal from 0.

The digital video signal from the digital video processing unit 115 is given to the D / A conversion unit 109. The output from the digital video processing unit 115 to the D / A conversion unit 109 is controlled by the frame memory 116. D / A converter 1
09 converts an analog video signal into a digital video signal,
This digital video signal is output via the analog video I / F unit 111.

The video coding unit 108 and the video coding unit 110 are CCITT recommendation H.264. H.261, and is configured according to H.261. The frame structure defined in 221 is adopted.

Next, Recommendation H.264. The frame structure defined in 221 will be described with reference to FIGS. 10 and 11.

Recommendation H. In 221, 64 kbps ~ 1920
The frame structure in the AV service on the kbps channel is specified. Recommendation H. The frame structure defined by 221 is 8 frames per frame, as shown in FIG.
It consists of a structure consisting of 0 octets, with 1 on the horizontal axis.
The number 8 indicates a bit number, and the numbers 1 to 80 on the vertical axis thereof are octet numbers. As shown in FIGS. 10 and 11, FAS indicates a frame synchronization signal, and by this signal, control of frame synchronization and multiframe synchronization, a communication quality monitoring function, control of alarm information notification, and the like are performed.

On the other hand, BAS indicates a bit rate allocation signal, which is used to perform terminal capability, designation of bit rate allocation for each medium in an actual frame, and various other controls and notifications. As shown in FIG. 11, the BAS is transmitted in even frames and the corresponding error correction bits are transmitted in odd frames.

Next, the operation of the multimedia communication apparatus of this embodiment will be described with reference to FIGS. 3 to 5 are flowcharts showing the operation of the multimedia communication device of FIG.

When there is an incoming call, step S101 is first executed as shown in FIG. In step S101,
It is determined whether or not the answering machine is in the answering machine. When the mode is set to the answering machine mode, step S102 is executed. In step S102, it is determined whether the incoming call is a videophone call or a telephone call.

When the incoming call is a videophone call, step S103 is executed. In step S103, the call is automatically set up, that is, the first connection is established, the frame synchronization is established on the in-channel, and the capability information exchange sequence by the BAS code is executed.

After the establishment of the first connection, step S
104 is executed. In step S104, it is determined whether or not there is an additional connection setting request. If there is an additional connection setting request, step S105 is executed, and if there is no additional connection setting request, step S1
Step S106 is executed without executing 04.

In step S105, establishment of an additional connection, establishment of frame synchronization on the additional connection, establishment of multi-frame synchronization, and establishment of synchronization with the first connection are performed.

Then, step S106 is executed. In step S106, the transmission mode such as the audio encoding mode and the video transmission mode is determined, and the mode switching sequence is executed.

Next, step S107 is executed. In step S107, a response message is selected according to the communication partner and communication mode, and transmission is started.

After the start of transmission, step S108 is executed. In step S108, it is determined whether or not the transmission of the response message is completed.

When the transmission of the response message is completed, FIG.
As shown in step S109, step S109 is executed. In step S109, the reception mode from the partner device is confirmed,
H. It is determined whether or not the reception of the H.261 moving image information is ON.

H. When the H.261 moving image information is being received, step S110 is executed. In step S110, the analog storage unit 106 which is the audio / video information storage medium is selected as the received message storage medium, and at the same time the reception timer is started.

After the reception timer is started, step S111 is executed. In step S111, the transmission of the audio is stopped by turning off the transmission audio in the transmission mode or activating the transmission audio mute. Continue sending.

Then, step S113 is executed. In step S113, the end of communication or the time-up of the reception timer is monitored. When the end of communication or the time-up of the reception timer is detected, step S114 is executed. In step S114, the reception message file is closed and post-processing is performed.

H. When the H.261 moving image information is not received, step S119 is executed, and step S119 is executed.
Then, as the received message storage medium, the digital storage unit 1
12 is selected, or the audio analog recording unit 118 is selected, and a path for the selected storage medium is set.
Note that the digital storage medium 112 is selected when receiving the JPEG still image information.

Then, step S120 is executed. In step S120, the voice transmission mode is turned off or the transmission voice is muted. Thereafter, the processing from step S113 is executed.

When it is determined in step S102 that the incoming call is a telephone call, step S115 is executed. In step S115, a call is automatically set, and a response message corresponding to the communication partner is selected and transmission is started.

After the start of transmission, step S116 is executed, and in step S116, it is determined whether or not the transmission of the response message is completed. When the transmission of the response message ends, step S117 is executed, and step S1
17, the digital storage unit 1 is used as a received message medium.
12 is selected, or the voice analog recording unit 118 is selected. Next, step S118 is executed, and in step S118, audio mute is performed.

As described above, since the storage medium for the optimum received information is always automatically selected, useless use of the storage medium can be prevented and an economical and efficient use environment can be obtained. . Specifically, video image information
When the analog recording unit composed of a VTR is selected as a storage medium when there is audio information, it is possible to eliminate the waste of recording a received message containing only audio without video into a recording tape as in the conventional case.

Further, it becomes easy to optimally send the response message to each mode, and the communication partner side can display only the received image during the transmission of the answering message, which makes it easy to send the answering message psychologically. There is an effect that.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a view showing the arrangement of operation keys of the operation unit in the second embodiment of the multimedia communication device of the present invention.

The multimedia communication apparatus of this embodiment has the same configuration as that of the multimedia communication apparatus shown in FIG. The frame structure defined in 221 is adopted.

Recommendation H. As shown in FIG. 10, the frame structure defined by reference numeral 221 is a structure in which one frame is composed of 80 octets, and the numbers 1 to 8 on the horizontal axis indicate bit numbers and the numbers 1 to 8 on the vertical axis. The number 80 is an octet number. As shown in FIGS. 10 and 11, FAS indicates a frame synchronization signal, and by this signal, control of frame synchronization and multiframe synchronization, a communication quality monitoring function, control of alarm information notification, and the like are performed.

On the other hand, BAS indicates a bit rate allocation signal, which is used to perform terminal capability, designation of bit rate allocation for each medium in an actual frame, and various other controls and notifications. As shown in FIG. 11, the BAS is transmitted in even frames and the corresponding error correction bits are transmitted in odd frames.

Next, the operation section will be described with reference to FIG.

As shown in FIG. 6, the operation unit includes an LCD display unit 20 for displaying input information for operation and various received information, and a plurality of units for instructing registration / change / execution control of additional services. Direct function keys 21 to 29 of
Numeric keypad 30 for dial input, plural function keys 31, and plural one-touch dial keys 32
And has the direct key 26 for setting the answering mode.
It is an answering machine mode key to release.

Next, the operation of the second embodiment of the multimedia communication apparatus of the present invention will be described with reference to FIGS. 7 to 9.
7 to 9 are flowcharts showing the operation of the second embodiment of the multimedia communication device of the present invention.

Referring to FIG. 7, when the direct function key 26, which is an answering machine mode key, is depressed in step S201, step S202 is executed, and in step S202, the answering machine mode is set from the current mode state. It is determined whether or not there is.

When the answering machine mode is not set, step S203 is executed. In step S203, the mode is set to the answering machine mode, and the own terminal ability as the communication ability is set to "transfer rate ability = 1B", " Voice ability = A-
"law, μ-law PCM", "visual ability, other LS
D, HSD, etc. capability = none ”is set.

Then, step S204 is executed. In step S204, it is determined whether the incoming call is a videophone call or a telephone call. When the incoming call is a videophone call, steps S205 and S206 are sequentially executed, and when the incoming call is a telephone call, step S215 is executed.

In step S205, the first connection is established, and in step S206, frame synchronization is established by FAS search / detection on the in-channel.

Next, step S207 is executed. In step S207, the capability information is exchanged by the BAS, but the terminal capability at this time is only "1B, PCM voice capability". As a result, the partner device does not request additional connection setting, and in the next step S208, the PCM (μ-law / A-law) voice communication mode of mode 0F is set for both transmission and reception.

In step S215, a call is established.

Step S208 or step S215
After the execution of step S209, step S209 is executed as shown in FIG. In step S209, a response message according to the other party is selected from the storage unit 18 (shown in FIG. 1), the voice path is switched, and the transmission of the response message is started.

After the transmission of the response message is started, step S210 is executed. In step S210, it is determined whether or not the transmission of the response message is completed.

When the transmission of the response message is completed, step S211 is executed. In step S211, the voice receiving path is switched to the microcassette, the accumulation of the received message is started, and the maximum allowable received message timer is started.

After the reception message maximum allowable timer is started,
Step S212 is executed, and in step S212,
Monitor the end of communication and the timeout of the maximum allowable received message timer.

When either one of the end of communication and the timeout of the maximum allowable reception message timer is detected,
Step S213 is executed, and in step S213,
Perform post-processing such as recording received message accumulation time of communication time.

If it is determined in step S202 that the answering machine mode has already been set, step S214.
Is executed. In step S214, the answering machine mode is canceled and the capability of the own terminal is returned to the original capability. For example, as the capability, “transfer rate capability = 2B”, “voice capability = G.722 48kbps”, “video capability = CIF &
QCIF ”,“ LSD = 4800 bps ”, etc. are automatically set.

It should be noted that, when the call is a videophone call or a call other than a telephone call, it is ignored.

As described above, by setting the answering machine mode by operating the direct function key 26, it is automatically declared in the capability information exchange sequence when receiving a videophone call that the communication is the PCM voice capability / 1B communication.
The PCM voice-only communication is activated, and the received message can be stored in the same voice storage medium as when a normal telephone call is received. Therefore, it is possible to suppress wasteful consumption of the recording medium for the received information in the answering machine mode, and it is inexpensive. In the answering machine mode, the answering machine mode is released by pressing down the direct function key 26, and the ability as a videophone is automatically restored to the original ability, so that complicated operations such as ability change can be eliminated. it can.

In the present embodiment, an example in which a microcassette is used as a voice information storage unit has been described, but instead of this, the storage unit may be constituted by a memory or the like.

Although the response message and the received message are not particularly described, the storage capacity can be further reduced by performing compression storage / expansion reproduction in real time using a general-purpose answering machine chip.

Furthermore, the voice communication capability is "transfer rate capability = 1B", "voice capability = A-law, μ-lawPC.
Although the case of reducing to "M" has been described, it is not necessarily limited to this ability, and the voice communication ability is set to PCM, the moving image communication ability is eliminated, and another still image communication ability is held in the setting ability. can do.

[0107]

As described above, according to the multimedia communication apparatus of the present invention, the optimum recording section is selected according to the type of media information, so that the recording medium of the received information in the automatic recording mode is selected. It is possible to suppress the wasteful consumption of and is inexpensive.

Further, since the type of media information sent through the line is determined and the response transmission data is selected according to the result of the determination, it is possible to make an appropriate response according to the transmission partner.

Further, since the received voice information in the telephone call and the videophone call is stored in the same recording section, it is possible to suppress the wasteful consumption of the recording medium for the received information in the automatic recording mode and it is inexpensive. .

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a first embodiment of a multimedia communication device of the present invention.

2 is a block diagram for explaining flows of an audio signal and a video signal of the multimedia communication device of FIG.

FIG. 3 is a flowchart showing an operation of the multimedia communication device of FIG.

FIG. 4 is a flowchart showing an operation of the multimedia communication device of FIG.

5 is a flowchart showing an operation of the multimedia communication device of FIG.

FIG. 6 is a diagram showing an arrangement of operation keys of an operation unit in the second embodiment of the multimedia communication device of the present invention.

FIG. 7 is a flowchart showing an operation of the second embodiment of the multimedia communication device of the present invention.

FIG. 8 is a flowchart showing the operation of the second embodiment of the multimedia communication device of the present invention.

FIG. 9 is a flowchart showing the operation of the second embodiment of the multimedia communication device of the present invention.

FIG. 10 CCITT Recommendation H. FIG. 221 is a diagram showing a frame structure defined in H.221.

FIG. 11 is a diagram showing bit assignment between 1 frame = 8 frames (1 subframe = 2 frames) of FAS.

FIG. 12 is a flowchart showing a basic sequence relating to execution of multimedia communication of video, audio, data (all user information other than video and audio) according to CCITT recommendation.

[Explanation of symbols]

 4 voice interface unit 5 voice encoding / decoding unit 10 video interface unit 11 video encoding / decoding unit 13 data interface unit 15 system control unit 16 demultiplexing unit 17 line interface unit 18 storage unit 26 direct function key (absent) Recording mode key) 101 analog audio I / F unit 103 audio encoding unit 105 audio decoding unit 106 analog storage unit 108 video encoding unit 110 video decoding unit 111 analog video I / F unit 112 digital storage unit 113 multiplexing unit 114 separation unit 115 digital video processing unit 116, 117 frame memory 118 audio analog storage unit

Claims (6)

[Claims] 1. A demultiplexing unit that receives multiplexed multimedia information via a line and separates each predetermined media information, and a media information that is automatically accepted by the demultiplexing unit and separated by the demultiplexing unit. A multimedia communication device, comprising: an automatic recording means for automatically recording according to the type. 2. The multimedia communication device according to claim 1, wherein the media information includes audio information and video information. 3. The multimedia communication device according to claim 2, wherein the audio information and the video information are recorded in the automatic recording means in synchronization with each other. 4. A storage unit for storing a plurality of types of response transmission data, a receiving unit for receiving received media information via a line, and a type of the media information according to a reception result of the receiving unit. A multimedia communication device, comprising: a determining unit that determines whether or not the transmission data for response is selected based on a result of the determination by the determining unit. 5. The multimedia communication device according to claim 4, wherein the media information includes audio information and video information. 6. A demultiplexing means for receiving multiplexed multimedia information via a line and demultiplexing each predetermined media information, and a media information demultiplexed by the demultiplexing means for automatically receiving the reception. What is claimed is: 1. A multimedia communication device comprising: an automatic recording means for automatically recording according to the type; and a switching means for switching between setting and canceling of the automatic recording means, wherein the multiplexed multi-media is provided according to the switching of the switching means. A multimedia communication device comprising a changing means for changing the communication capability of media information.