JP3141396B2 - Multimedia terminal and control method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multimedia terminal for transmitting and receiving images and sounds and a control method therefor .

[0002]

2. Description of the Related Art In recent years, with the advancement of communication technology, semiconductor technology, and optical technology, digital lines have been provided, and high-speed, large-capacity data transmission has become possible.

[0003] In particular, the characteristics of digital transmission are that the same level of quality is maintained without quality deterioration due to transmission,
There is no need for a transmission path according to the characteristics of the media of the transmission data, so that the media can be integrated, and transmission between multi-media terminals has become possible. Therefore, a telephone terminal that simultaneously transmits an image from a conventional voice-only telephone has appeared.

Under such circumstances, international standardization by CCITT and the like is being promoted so that mutual communication can be performed between different complex terminals, and AV (Audio) such as a video telephone using a digital line, a video conference system, and the like.
Visual) service rules, protocol rules, and multimedia multiplex frame configuration rules for CC
ITT Recommendation (or Draft) 320, H .; 242,
H. 221 etc.

[0005] H. For the H.221, 64 Kbps to 192
Exchange of frame structure and terminal capability in AV services up to 0 Kbps and FAS (Frame A
Lignent Signal), BAS (Bit
Allocation Signal) is defined. H. H.242 defines a protocol such as capability exchange between AV terminals using BAS and switching of communication mode. In 320, system aspects of the entire AV service are defined.

In the above recommendation or draft recommendation, after setting up an end-to-end physical connection and establishing synchronization by FAS in the in-channel, the BAS
A method for performing multimedia communication of images, voices, data, and the like between terminals is defined by a procedure such as a terminal capability exchange sequence using, and a mode switching sequence by designating a communication mode. However, it is out of the specified range that each terminal changes its own terminal capability according to the situation, and which communication mode is used within the range of the exchanged capability. Information transfer speed of each media in multimedia communication, audio information is determined by specifying the audio encoding method, data information is determined by specifying whether or not to use, the transfer speed when using, The remainder obtained by subtracting the transfer speed of the audio information and the transfer speed of the data information from the set information transfer speed of the entire communication path is the transfer speed of the image information.

[0007]

However, according to the above-described conventional multimedia terminal, when image data is communicated between the terminals, when the terminal is normally connected to a partner terminal,
The screen of the display unit switches from the display of the operation screen for the multimedia terminal to the received image, but thereafter, unless the communication ends or the operator intentionally switches the screen,
Keep displaying the received image. However, since the other terminal cannot stop the transmission of image data during communication or switch the screen even when switching to other media information, the display unit display screen continues to display meaningless images, Alternatively, there is a problem that a distorted image is displayed.

[0008] Also, when the capacity exchange itself does not work well
At least one of the communication terminals waits
It may be wrong. In such a case, the image
May not be able to recognize that data has not been transferred.
And continue to display meaningless images for the user.
Will be able to. The present invention has been made in view of the above problems.
If the ability exchange itself does not go well
However, communication can be performed properly and
Prevents the display of tasteless or distorted images,
A multimedia terminal and
And a control method thereof.

[0009]

In order to achieve the above object, a multimedia terminal according to the first aspect of the present invention comprises:
Data on multiple media, including
A multimedia terminal comprising:
Transmitting and receiving means for transmitting and receiving data of the
The transfer rate of the data to be transmitted and received
Recognizing means for recognizing each medium;
A) From the transfer rate reserved for the terminal,
Transfer recognized by the recognition means for data other than data
Generating means for generating a value excluding a rate; and the generating means
Transmission / reception by the transmission / reception means according to the value at which
Determining means for determining the presence or absence of image data of the
It is characterized by doing. The multimedia according to claim 2,
The terminal according to claim 1, wherein the terminal is a multimedia terminal.
Further, the discrimination means determines that the image data does not exist.
Display the absence of the image data on the display
Characterized by having display control means for controlling the
And The method for controlling a multimedia terminal according to claim 3.
Sends and receives data on multiple media, including image data
Multimedia terminal control method
Transmitting and receiving data of the plurality of media.
And the transfer rate of the data transmitted / received in the transmitting / receiving step.
Recognizer for recognizing each of the media to be communicated
And the transfer reserved for the multimedia terminal
From the rate, the data for the data other than the image data
Generates a value excluding the transfer rate recognized in the recognition process
Generating step and the sending in accordance with the value generated in the generating step.
Determines the presence or absence of image data of data to be transmitted / received in the receiving process.
And a differentiating step. Claim 4
A method for controlling a multimedia terminal according to claim 3, wherein
The method for controlling a multimedia terminal of the above, further comprising:
If it is determined in the determining step that the image data does not exist, the previous
The display section indicates that there is no image data.
And a display control step of controlling the display. Claim
5. The multimedia terminal according to item 5, wherein a plurality of
Multimeter capable of transmitting and receiving media of the data
Media terminal for transmitting data of the plurality of media.
Transmitting / receiving means for receiving, and a partner end through the transmitting / receiving means
A capability exchange means for exchanging communication capabilities with the terminal;
Data transmitted / received by the transmitting / receiving means according to the result of the converting means.
Data transfer rate for each of the media to be communicated.
Assigning means for assigning the image data,
Transfer rate assigned to data other than
The transfer rate reserved for multimedia terminals
Is larger than the communication terminal,
Control means for controlling so as to notify
Sign. The multimedia terminal according to claim 6, wherein
Item 6. The multimedia terminal according to item 5, wherein the control means
The assigning means assigns data other than the image data to
Transfer rate assigned to the multimedia terminal
If it is higher than the transfer rate reserved for the end,
Control the ability exchange means so that the ability is exchanged again
It is characterized by the following. The multimedia terminal according to claim 7.
Controls the data of multiple media including image data.
Of multimedia terminals that can send and receive data
Transmitting and receiving data of the plurality of media.
Transmitting and receiving step, and communicating with the partner terminal through the transmitting and receiving step.
A capacity exchange step of exchanging communication capacity, and the capacity exchange step
Of data transmitted and received in the transmitting and receiving step according to the result of
Allocate a transmission rate for each of the media to be communicated
An allocating step; and
The transfer rate assigned to outside data is
Greater than the transfer rate reserved for multimedia terminals
If it is, notify the other terminal as an error in the communication capability
Control step of controlling
You. A multimedia terminal according to claim 8 is a multimedia terminal according to claim 7.
In the method for controlling a multimedia terminal according to the above,
The step includes the step of assigning data other than the image data in the assigning step.
The transfer rate assigned to the
A If the transfer rate is higher than the transfer rate reserved for the terminal
Controls the capacity exchange process so that the capacity is exchanged again
It is characterized by doing .

[0010]

In the multimedia terminal according to the present invention,
If it is recognized that there is image data in the communication data, the image switching unit is made to select the received image signal and displayed on the display unit,
If it is recognized that there is no image data in the communication data, the image switching unit is made to select a control image signal and displayed on the display unit. This prevents display of meaningless images and disturbed images.

[0011]

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

FIG. 1 is a block diagram of a multimedia terminal according to one embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a handset which is one of voice input / output means, 2 denotes a microphone which is one of voice input means, 3 denotes a speaker which is one of voice output means, and 4 denotes a system control described later. In accordance with an instruction from the unit 14, a function of switching the handset 1, the microphone 2, and the speaker 3 as voice input / output means, a gain adjustment function of adjusting a gain for volume level adjustment, and detection of whether the handset 1 is in an on-hook state or an off-hook state. On / off detection function, echo cancellation function for canceling echo when microphone 2 and speaker 3 are used as voice input / output means, dial tone
A voice interface unit having a tone generation function for generating tones such as a call tone, a busy tone, and a ring tone;
5 is 64Kbps P according to the instruction of the system control unit 14.
CM (A-law), 64 Kbps PCM (μ-la
w), 64Kbps / 56Kbps / 48Kbps (S
B-ADPCM), 32Kbps ADPCM, 16K
The transmission audio signal is subjected to AD in accordance with an audio encoding / decoding algorithm such as 8 bps (for example, APC-AB) and 8 Kbps.
Convert and encode function, decode received voice signal and
This is a voice encoding / decoding unit having a function of performing / A conversion. The voice coding / decoding section 5 has a voice coding section 5a and a voice decoding section 5b.

Reference numeral 6 denotes one of image input means, a camera for inputting a self-portrait or the like, 7 denotes one of image input means, a document camera for inputting pictures, drawings, etc., and 8 denotes a camera 6 or A display unit (display means) for displaying an input image from the document camera 7, an image received from the other party, and an image from the system control unit 14, a switching function of image input means 9 generated by an instruction from the system control unit 14, A video interface unit having a display switching function and display division function of each image, and a signal conversion function for electrically / physical matching with an image signal of each image input / output unit.
D-conversion and coding function, received image decoding and D /
An image encoding / decoding unit having a function of performing A-conversion. The image encoding / decoding unit 10 performs motion compensation, frame dropping, inter-frame compensation and intra-frame compensation, DCT transform, Band compression is performed by various techniques such as vector quantization conversion to reduce the capacity, and image data can be transmitted over a digital line. The video interface unit 9 has an image input unit 9a and an image output unit 9b, and the image encoding / decoding unit 10 has an image encoding unit 10a and an image decoding unit 10b. At present, the basic interface of the ISDN line is 64 Kbps.
Draft T Recommendation H. 261.

Reference numeral 11 denotes a data terminal for performing data communication. Reference numeral 12 denotes transmission data from the data terminal 11 and the system control unit 14 to the demultiplexing unit 15,
The received data is transferred to the data terminal 11 or the system control unit 14
8 is a data interface unit for notifying the user, 13 is an operation unit such as a keyboard and a touch panel used for inputting control information for controlling the apparatus shown in FIG. 8, and 14 is a CPU, ROM,
A system control unit that includes a RAM, an auxiliary storage device, a character generator, an image signal generation circuit, etc., monitors the status of each unit, controls the entire device, creates an operation / display screen according to the status, and executes an application program. ,
Numeral 15 multiplexes audio data from the audio encoding / decoding unit 5, image data from the video encoding / decoding unit 10, data from the data interface unit 12, and BAS from the system control unit 14 in units of transmission frames. , Is a demultiplexing unit that separates a received frame into each medium of a configuration unit and notifies each unit of the demultiplexed frame. 221. A line interface unit 16 controls a line according to the ISDN user network interface. An image switching circuit 17 selects an image signal received from the image decoding unit 10b and a control image signal from the system control unit 14 and transmits them to the image output unit 9b. Is a synchronization detection unit that detects the synchronization signal of the above and notifies the system control unit 14. The synchronization detection unit 18 monitors the horizontal / vertical synchronization signal in the received image signal. If a synchronization signal has been generated, it is regarded as synchronous. If no synchronization signal has been generated, it is regarded as out of synchronization. This is to be notified.

When an error occurs during image decoding in the image decoding unit 10b, the synchronization signal is disturbed and the synchronization detection unit 18 operates. When the image decoding unit 10b generates an undecodable error that has a great effect on the image at the time of image decoding, it is regarded as out of synchronization, and the image decoding unit 10b notifies the synchronization detection unit 18 of this error. As described above, there is a method in which the synchronization detection unit 18 notifies the system control unit 14 of the fact that the synchronization is lost by notifying the notification.

Next, a method for negotiating terminal capabilities and changing terminal capabilities will be described. First, ISD
In the case of communication over N lines, as shown in FIG. 2, a call is made using an out-band signal (that is, a D channel). As shown in FIG. 2, communication on the B channel is enabled by a call setting from the terminal A to the terminal B and a response from the terminal B to the terminal A.
Other communication channels include D channel, H0, H1, etc., but only the B channel will be described, and the following description will be omitted.

Next, using the B channel that has become communicable, the H.264 standard is used. In accordance with H.242, the in-band signal procedure of the B channel is performed as shown in FIG. 3 (that is, the inside of the B channel is allocated to the data section and the control section and controlled by the control section). Since this control is called an in-channel control procedure, this name will be used hereinafter. When performing this in-channel control, a control bit is required in the B channel. 221.

FIG. 4 shows this frame configuration. The multi-frame structure in FIG. 4 is for the B channel (64 Kbps). First, the multi-frame structure is based on 1 octet / 125 μsec, and as shown in FIG.
Frame = 80 octets, 1 sub-multiframe = 2 frames as in (b), 1 multiframe = 8 sub-multiframes as in (c), and 8 Kbps sub-channel in the bit direction Are defined from # 1 to # 8. However, the transfer rate of only the # 8 sub-channel is 6.4 Kbps, and FAS (Frame Alignment Signal) is used as a control bit.
nal) and BAS (BitrateAllocatio)
n Signal) is inserted. This FA
S and BAS enable in-channel control of the B channel. FAS is used for frame and multi-frame synchronization. The BAS is used for exchanging information on terminal capability or setting capability required for determining a multiplexing method such as a subchannel. In particular, BAS can be switched every sub-multiframe (20 msec) even during data communication. The octet data is transmitted in order from the lowest octet number.

Next, the procedure will be described with reference to FIG. First, when the B channel becomes communicable, both terminals A and B transmit FAS. The terminal capability at this time is mode 0 in the initial state (mode of only audio, FAS, and BAS). This FAS is searched at the partner terminal, and
When the conditions for establishing frame synchronization specified in H.242 are satisfied, A in the bit configuration in the FAS shown in FIG.
Is set to “0” and transmitted. When the terminal receives A = 0, it is confirmed that frame synchronization of the partner terminal has been established. Next, the capability information of the own terminal is transmitted to the partner terminal by BAS (dotted line in FIG. 3), and the terminals recognize each other's terminal capability. At this point, if they can communicate with each other, data communication starts. When the capability change is necessary, similarly, the terminal capability is transmitted as a command using the BAS, and after the partner terminal completes setting the capability, data communication is started. Data communication is independent for transmission and reception,
The establishment of the synchronization and the setting of the terminal capability are performed separately. Therefore, out of synchronization may occur only in one direction, or the type of data may be different between transmission and reception. When the data communication is completed and the call is to be disconnected, the terminal to be disconnected (terminal A in FIG. 3) first sets the mode to 0 using the BAS. This allows
The in-channel control of the B channel has returned to the initial state.

Next, as shown in FIG. 2, disconnection and release are performed in the out-band procedure of the D channel, and all communication is completed.

FIGS. 5A to 5C show the bit configuration in the FAS. The A bit is an indication of loss of frame synchronization. The E bit is an indication of whether a CRC error has occurred. C ₁ , C ₂ , C ₃ and C ₄ are 4 bits of CRC. N _{1 to} N ₅ are for numbering of multiframes. R _{1 to} R ₄ are channel numbers. The TEA sets “1” when a terminal device alarm cannot receive or respond to an input signal due to a failure inside the terminal. It should be noted that the service channel in FIG.
The eighth sub-channel shown in FIG.

FIGS. 6A and 6B show the bit configuration in the BAS. As shown in (a), the upper three bits represent an attribute, and the remaining five bits represent the attribute value of the attribute. (B) shows the contents of the attribute. As the attribute value, for example, a transfer rate value, a codec type, a parameter value specific to each medium, and the like are defined.

Next, an operation flow of an embodiment of the multimedia terminal according to the present invention is shown in FIGS. First, communication between the multimedia terminal and the telephone is selected (step S1). In the case of communication as a telephone, the image switching unit (SW) 17 is connected between the terminals C and B (steps S2 and S3). On the display unit 8, a telephone screen created by the system control unit 14 is displayed (step S4). For example, at the time of outgoing call, numeric keypad, phonebook, or keyed-in telephone number is displayed, at the time of incoming call, if the other party is known, the telephone number of the other party is displayed. ,
The call time is displayed. The voice unit (the voice interface unit 4 and the voice encoding / decoding unit 5) is activated and maintained until the call is disconnected (steps S5 to S5).
7).

Next, in the case of communication by the multimedia terminal, the image switching unit 17 is connected between C and B (step S8), and the display unit 8 displays the multimedia terminal created by the system control unit 14 for the multimedia terminal. Is displayed (step S9). For example, at the time of outgoing call, setting of transmission capability used for communication and telephone, as well as numeric keypad, terminal number book and key input terminal number are displayed, at the time of incoming call, the capability display of the partner terminal and the display during transmission If the capability display and the partner terminal number are known, the terminal number is displayed. In the capability negotiation by the BAS (step S10), if there is a voice as the capability, the voice unit is activated (steps S11 and S1).
2) The transfer rate A of the selected voice codec is subtracted from the secured transfer rate X of the B channel (step S).
13) If the transfer rate is Y and Y = 0, it is determined that there is no data and no image (step S1).
4, S15). Therefore, in this case, the image switching unit 1
7 is connected between C and B (step S16 in FIG. 9), and an image from the system control unit 14 is displayed. As an example, the current transmission capability is displayed, and the operator is notified that no image is transmitted. Alternatively, media information (drawing, still image, text data, etc.) other than a moving image is transmitted and received as data, and the system control unit 14 converts this data into an image and displays it. If Y> 0, if there is data as the capability, the data interface unit (data unit) 12 is activated (steps S17 and S18), and the transfer rate B of the selected data is subtracted from the transfer rate Y, This transfer rate is set to Z (step S19), and if Z = 0, it is determined that there is no image (step S20). Therefore, in this case, the image switching unit 17 is connected between C and B (step S16), and the image from the system control unit 14 is displayed. In the case of Z> 0, if there is no image as the capability, the image switching unit 17 is connected between C and B, and the image from the system control unit 14 is displayed (steps S21 and S21).
16). If there is an image as the capability, the image unit is started, and the transfer rate Z is set as the image transfer rate, and the synchronization detection unit 18
Detects the synchronization / asynchronization of the image signal (step S2).
2) When the synchronization of the image signal is established, the system control unit 14
Recognizes this, connects the image switching unit 17 between C and A (step S23), transmits the partner image from the image decoding unit 10b to the image output unit 9, and outputs it to the display unit 8. Here, if Y <0 or Z <0, it is reported to the partner terminal as a capability selection error, and capability negotiation is started again (steps S27 and S28). For example, mode 0
There is a method such as returning to the beginning and exchanging the ability again. If the synchronization is lost, the image switching unit 17 is connected between C and B, and the image created by the system control unit 14 is displayed on the display unit (step S24). As an example, a message such as “Please wait” is displayed to inform the operator that the other party's image is waiting to be received. When a display switching instruction is given from the operation unit 13 by a key input or the like (step S25), the system control unit 14 switches the image switching unit 17 to a side opposite to the current switch position (step S26). For example, if the connection between C and A is connected, the connection is switched to C and B. If the connection between C and B is connected, the connection is switched to C and A.

Next, a case of a capability change during communication will be described. When the own terminal changes the capability (step S2
9) In response to an instruction to change the transmission capability from the operation unit 13,
The system control unit 14 transmits the B
The capability change is notified to the partner terminal by the in-channel BAS of the channel (step S30). At the same time, the own terminal also changes the audio part, the data part, the image part (the image input / output unit 9 and the image encoding / decoding unit 10) and the image switching unit 17 according to the change of the capability (steps S11 to S34). In this case, when there is no voice, the transfer rate is set to A = 0, and when there is no data, the transfer rate is set to B = 0, and the process proceeds to step S21 (steps S31 to S34). When the capability is changed from the partner terminal, the command is received by the BAS, so that the voice part, the data part, the image part, and the image switching part 17 are changed accordingly.

Next, when the communication is completed (step S3)
5) will be described. If the operation is to be terminated from the own terminal (step S36), the system control unit 14 sends the mode 0 to the partner terminal by the B-channel in-channel BAS via the demultiplexing unit 15 according to an instruction from the operation unit 13.
(Step S37). at the same time,
The own terminal is also set to mode 0 (step S37), the system control unit 14 connects the image switching unit 17 between C and B, and displays the image from the system control unit 14 on the display unit (step S39). As an example, the operator is notified that the line is disconnected. Thereafter, a disconnection is transmitted from the own terminal (step S40), and a release is received from the partner terminal, and the communication is terminated.
At this time, the communication time, the charge, and the like are displayed, and when the preparation for the next communication is completed, the screen returns to the initial screen. In the case of ending from the partner terminal (step S36), the system control unit 14 receives the notification of the capability change to the mode 0 from the BAS (step S38), and connects the image switching unit 17 between C and B (step S38). S39), the image from the system control unit is displayed on the display unit. As an example, the operator is notified that the line is disconnected. Thereafter, the line is disconnected (step S4).
0) When the preparation for the next communication is completed, the system control unit 14 displays an initial screen on the display unit.

As described above, according to this embodiment, the mask
From the transfer rate reserved for multimedia terminals,
Excluding the specified transfer rate for data other than image data
Value, and the presence or absence of image data is determined according to the result.
For example, selection of communication capability according to capability exchange
If you make a mistake, the image data may
You can judge nothing, and even if the ability exchange
Communication assigned to your device even if done correctly
The capacity of the line itself fluctuates, and communication is maintained with the exchanged capacity
You may not be able to
Communication processing according to the capacity of the communication line
Can be. Furthermore, when it is determined that there is no image data
In addition, the fact is displayed on the display unit, so there is no meaningful image
It is possible to prevent a distorted image from being displayed .

Further, data other than image data is assigned.
Transfer rate to be assigned for multimedia terminals
If the transfer rate is higher than the
Negotiation, etc.
Recognizes that the transfer rate secured by
That image data cannot be transferred.
Can be recognized.
Communication capability can be reset .

[0030]

As described in detail above, claim 1
According to the terminal and the method described in claim 3, the multimedia
Image data from the transfer rate reserved for
Data except for the specified transfer rate.
Occurs, and the presence or absence of image data is determined according to the result.
So even if you make a mistake in selecting the communication capability according to the capability exchange
The presence or absence of image data based on the capacity of the communication line
can do. Also, even if the ability exchange is performed correctly
Of the communication line itself assigned to your terminal
The capacity fluctuates, and communication can be maintained with the exchanged capacity.
You may not be able to communicate.
Communication processing can be appropriately performed according to the capacity of the line.
If it is determined that there is no image data,
Useless images or distorted images are displayed on the display unit
Can be prevented from being displayed. That is,
Communication model, communication protocol, or line capacity
Communication capacity is selected appropriately for reasons such as fluctuations in
Even if you cannot transfer images,
Determine the presence or absence of data and create images that are meaningless to the user
It is possible to prevent the display from being continued. In addition,
According to the terminal described in claim 5 and the method described in claim 7,
Transfer rate assigned to data other than image data
Is the transfer rate reserved for multimedia terminals
If the value is larger than
So that it is secured by negotiations etc.
Transfer rate is incorrect.
That the transferred image data has not been transferred
In addition, communication capability can be re-established by such notification.
Can be specified.

[Brief description of the drawings]

FIG. 1 is a block diagram of a multimedia terminal according to one embodiment of the present invention.

FIG. 2 is a sequence diagram showing a D-channel procedure.

FIG. 3 is a sequence diagram showing an in-channel control procedure.

FIG. 4 is a frame configuration diagram.

FIG. 5 is a diagram illustrating a bit configuration in an FAS.

FIG. 6 is a diagram illustrating a bit configuration in a BAS.

FIG. 7 is a flowchart showing an operation of one embodiment of a multimedia terminal according to the present invention.

FIG. 8 is a flowchart showing the operation of one embodiment of the multimedia terminal according to the present invention.

FIG. 9 is a flowchart showing an operation of one embodiment of a multimedia terminal according to the present invention.

FIG. 10 is a flowchart showing an operation of one embodiment of a multimedia terminal according to the present invention. Reference Signs List 1 handset 2 microphone 3 speaker 4 audio interface unit 5 audio encoding / decoding unit 5a audio encoding unit 5b audio decoding unit 6 camera 7 document camera 8 display unit 9 video interface unit 9a image input unit 9b image output unit 10 image encoding Combination unit 10a Image encoding unit 10b Image combination unit 11 Data terminal 12 Data interface unit 13 Operation unit 14 System control unit 15 Demultiplexing unit 16 Line interface unit 17 Image switching unit 18 Synchronization detection unit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-144484 (JP, A) JP-A-2-113788 (JP, A) JP-A-2-285785 (JP, A) JP-A 63-144 90953 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04M 11/00-11/10 H04N 7/14

Claims (8)

(57) [Claims] 1. A method for storing data on a plurality of media including image data.
Multimedia terminal that can send and receive data
Te, transmitting and receiving means for transmitting and receiving data of the plurality of media
And the transfer rate of data transmitted and received by the transmitting and receiving means
Recognition means for recognizing each of the media to be communicated
And a transfer rate reserved for the multimedia terminal
From the recognition means for data other than the image data.
Means for generating a value excluding the transfer rate recognized by the stage
And the transmitting and receiving means according to the value generated by the generating means.
To determine the presence or absence of image data
Multimedia end having separate means
End. 2. The image processing apparatus according to claim 1, further comprising:
If it is determined that there is no data, there is no image data
Display control means for controlling the display on the display unit.
2. The multimedia terminal according to claim 1, wherein
Not yet. 3. The data of a plurality of media including image data.
Of multimedia terminals that can send and receive data
The method A transmission / reception step of transmitting / receiving data of the plurality of media
When, Transfer rate of data transmitted / received in the transmitting / receiving step
For recognizing each of the media to be communicated
When, Transfer rate reserved for the multimedia terminal
From the recognition process for data other than the image data.
Generator that generates a value excluding the transfer rate recognized in the process
About Sending in the transmitting / receiving step according to the value generated in the generating step
A discriminator that determines the presence or absence of image data of data to be received
Control of multimedia terminals characterized by having
Your way. 4. The method according to claim 1, wherein in the determining step, the image data is
If it is determined that there is no image data, it indicates that there is no image data.
Having a display control step of controlling display on the display unit
4. The multimedia terminal according to claim 3, wherein
Control method. 5. The data of a plurality of media including image data.
Multimedia terminal that can send and receive data
hand, Transmitting / receiving means for transmitting / receiving data of the plurality of media
When, Exchange of communication capability with the partner terminal via the transmitting / receiving means
Ability exchange means, The transmitting / receiving means transmits and receives data according to the result of the capability exchange means.
The transfer rate of the data to be transmitted
Means for assigning for each The allocating means is for data other than the image data.
Transfer rate assigned to the multimedia terminal
If the transfer rate is higher than the reserved
Control to notify the partner terminal as an error in capability
Multimedia having control means
Terminal. 6. The control means, wherein the assigning means is a
The transfer rate assigned to data other than image data
Transfer is reserved for the multimedia terminal
If it is larger than the rate, exchange capacity again
6. The device according to claim 5, wherein the control unit controls the capability exchange unit.
The multimedia terminal as described. 7. Data of a plurality of media including image data.
Of multimedia terminals that can send and receive data
The method A transmission / reception step of transmitting / receiving data of the plurality of media
When, The communication capability is exchanged with the partner terminal through the transmission / reception process.
Capacity exchange process, Transmission / reception in the transmission / reception step according to the result of the capacity exchange step
The transfer rate of the data to be transmitted
An assignment process to be assigned to each In the assigning step, for data other than the image data
Transfer rate assigned to the multimedia terminal
If the transfer rate is higher than the reserved
Control to notify the partner terminal as an error in capability
And a control step
Terminal control method. 8. The method according to claim 1, wherein the assigning step is performed before the assigning step.
The transfer rate assigned to data other than image data
Transfer is reserved for the multimedia terminal
If it is larger than the rate, exchange capacity again
8. The method according to claim 7, wherein the capacity exchange step is controlled.
The control method of the multimedia terminal as described in the above .