JPH06284106A - Multi-medium communication equipment - Google Patents

Abstract

(57) [Summary] [Purpose] CCITT H. 221 conforms to CCITT G.221. It enables transmission of 64 Kbps audio data such as 722. [Structure] An HSD data separation / synthesis unit 20 is provided for synthesizing / separating a digital audio signal of an audio codec unit 8 with data from a data terminal interface 18 and interfacing with an HSD data interface 14, and by inputting a key operation unit 4. , The voice codec 8 to the voice data interface 11 or the HSD data separation / synthesis unit 20.
The audio data switching unit 21 for switching is provided so as to interface with either of the above.

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 having a function of multiplex transmission of moving images, voices and other data.

[0002]

2. Description of the Related Art In recent years, the International Telegraph and Telephone Advisory Committee (hereinafter,
CCITT) formalized video encoding system, multiplexing system, and communication procedure for audiovisual services, and along with that, each company has established a multimedia communication device such as a video conferencing system and a moving image videophone that comply with CCITT recommendation. It is on sale.

Hereinafter, a conventional multimedia communication apparatus for performing processing in accordance with the CCITT recommendation will be described with reference to the drawings. FIG. 6 is a functional block diagram of a conventional multimedia communication device. In FIG. 6, 1 is a camera for taking a self-portrait, 2 is a microphone, 3 is a speaker, 4
Is a key operation unit for inputting a telephone number and selecting a function, 5 is a monitor for displaying video or self-portrait from the other party, 6 is a data terminal, and 7 is compression / encoding (decompression / decoding) of video data. Video codec section, 8 is an audio codec section for compressing / encoding (decompressing / decoding) audio data,
9 is a terminal control unit that controls the entire terminal based on the settings from the key operation unit 4. 10 is a CCITT recommendation H.264 for video, audio, and other data to be transmitted to the other party. 221 (from 64 kbit / s in audiovisual teleservice to 1
H.920 transmitted from the other device is multiplexed in a frame format of 920 kbit / s channel). A multiplexing / separating unit that separates 221 frames into moving images, audio, and other data, and 11 is an audio codec unit 8.
And a demultiplexing / demultiplexing unit 10 for transmitting / receiving audio data, 12 is a moving image data interface for exchanging video data between the moving image codec unit 7 and the demultiplexing / demultiplexing unit 10, and 13 is a data terminal. 6 and LS that exchanges LSD data (Low Speed Data)
D data interface, 14 is data terminal 6 and HSD
An HSD data interface that sends and receives data (High Speed Data), a call control processing unit 15 that manages calls such as incoming and outgoing calls and disconnection, and a line interface unit 16 that connects a terminal to an ISDN line 17.
18 is the data terminal 6 and the HSD data interface 14
And a data terminal interface for exchanging data with the LSD data interface 13.

Further, the multiplexer / demultiplexer 10, the audio data interface 11, the moving image data interface 12, the LS
The circuit 19 composed of the D data interface 13 and the HSD data interface 14 is a multiplexing / demultiplexing control unit for transmitting / receiving various data and multiplexing / demultiplexing via each interface.

FIG. 7 is a diagram (voice data communication rate 56 Kbps) showing an example of a frame structure in the multiplexer / demultiplexer. Table 1 shows CCITT Recommendation H.264. 22 is a numerical table of BAS codes defined in 221.

[0006]

[Table 1]

With respect to the conventional multimedia communication apparatus including the above components, the relationship between the components and the operation thereof will be described below. When the telephone number of the partner terminal is set by the key operation unit 4 and the call key is pressed, the terminal control unit 9 notifies the call control processing unit 15, and the call control processing unit 1
Based on the notification, 5 connects the line with the other terminal through the line interface 16. Next, for example, the demultiplexing / demultiplexing unit 10 is operated by CCITT Recommendation H.264. If you follow 221
In response to the input of the communication rate of the voice data from the key operation unit 4, the terminal control unit 9 instructs the multiplexing / demultiplexing unit 10 to perform the channel allocation according to the input. The multiplexer / demultiplexer 10 forms a frame by channel allocation according to an instruction, and allocates audio, moving images, and other data to the determined subchannels. For example, when the ISDN line 19 is used for communication with B channels × 2 lines and a voice communication rate of 56 Kbps is instructed, a frame is constructed by channel allocation as shown in FIG. 7 and each data is allocated. That is,
The first subchannel to the seventh subchannel of the first channel are audio data, 16 bits (FAS, BAS) of the eighth subchannel of the first channel, and additional channels. 16 bits (F of the 8th sub-channel of the 2nd channel)
The rest except AS, BAS) is the moving image data.

Here, the frame structure is not changed unless the communication rate of the audio data is changed and the use of the LSD and HSD is instructed. Therefore, the communication rate of the video data is not changed. The terminal control unit 9 also instructs the voice codec unit 8 to perform data conversion using a voice encoding method corresponding to the communication rate of the voice data instructed to the multiplexing / demultiplexing unit 10. For example, at this time, CCIT
Recommendation G. 722 (56 Kbps). The audio codec unit 8 compresses and encodes the audio signal input from the microphone 2 by the instructed audio encoding method, and the multiplexer / demultiplexer 10
The voice data received from the partner terminal and demultiplexed by the demultiplexing / demultiplexing unit 10 is expanded and decoded, and the voice signal is transmitted to the speaker 3. At this time, if the communication rate of the voice data instructed to the multiplexing / demultiplexing unit 10 and the voice encoding system instructed to the voice codec unit 8 do not properly correspond, voice is successfully communicated between both terminals. Not done.

[0009]

However, the above-mentioned conventional multimedia communication device is an H.264 standard. When communication of a moving image signal and an audio signal is performed in 221 frames with, for example, two B channels, as shown in FIG. 7, allocation of the audio signal is permitted only up to 56 Kbps of the first channel. Also, in the case of communication at 3B or higher, the maximum allocation to the audio signal was 56 Kbps.

Therefore, it is necessary to use G.70 for connection with a digital telephone. In addition to 56 Kbps of 722, G. 722 64 Kb
Even with a multimedia communication device having a ps encoding algorithm, the H221 frame structure is 56K.
There is a drawback that the amount of voice data can be transmitted only at a communication rate of bps.

The present invention solves the above-mentioned problems.
ITTH. CCITT with a frame structure conforming to 221
G. It is an object of the present invention to provide a multimedia communication device capable of transmitting 64 Kbps audio data such as 722.

[0012]

In order to solve the above-mentioned problems, a multimedia communication device of the present invention combines and separates voice data of a voice codec unit with terminal data of a data terminal, and a multiplexing / demultiplexing control unit. The HSD data interface and the HSD data separating / synthesizing unit for exchanging the HSD data, and the exchange of the voice data with the voice codec unit are switched between the voice data interface and the HSD data separating / synthesizing unit according to an instruction input by the user. An audio data switching unit is provided.

[0013]

According to the present invention, with the above-described configuration, if there is an instruction input by the user or an instruction for voice communication at a communication rate of 64 Kbps from the other party via the call control processing unit regarding the voice encoding system, the terminal control unit. Notifies the audio codec unit of the instructed encoding method, instructs the multiplexing / separation control unit to have an audio communication rate of 0 bps, and the HSD data separation / synthesis unit to have the current communication rate of 64 Kbps. The switching unit is instructed to exchange voice data with the HSD data separation / synthesis unit, and the HSD data is separated.
The data separation / synthesis unit is instructed to synthesize / separate the voice data and the terminal data.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a block diagram showing a configuration of a multimedia communication device according to an embodiment of the present invention, FIG. 2 is a diagram showing an example of a frame configuration of a 2B line according to the present invention, FIG.
Is a diagram showing an example of the BAS code of the 2B line in the present invention, FIG. 4 (a) is voice data and terminal data input to the HSD separation / synthesis unit, and FIG. 4 (b) is output from the HSD separation / synthesis unit. HSD data, Fig. 5 shows H in the frame
It is an example of arrangement of SD data.

In FIG. 1, reference numerals 1 to 19 are the same as those in FIG. Reference numeral 20 synthesizes the terminal data from the data terminal interface 18 and the voice data from the voice codec section 8 and sends it as HSD data to the HSD data interface 14, and also the HSD data from the HSD data interface 14 to the voice codec section 8.
HSD data separating / synthesizing unit for separating the voice data to the voice codec and the terminal data to the data terminal interface 18, and 21 exchanges the voice data with the voice codec unit 8 according to an instruction input by the user.
And an HSD data separating / synthesizing unit 20.

For example, in the case of transmitting a moving image and an audio signal in B channel × 2, CCITT recommendation G.264. When using the 64 kbps voice encoding system such as 722, when the key operation unit 4 instructs the voice communication rate to be 64 Kbps, the terminal control unit 9 instructs the voice codec unit 8 to use the 64 Kbps voice encoding system. Is issued, and an instruction is given to the voice data switching unit 21 to disconnect the voice codec unit 8 from the voice data interface 11 of the multiplexing / demultiplexing control unit 19 to interface with the HSD data demultiplexing / synthesizing unit 20. The HSD data separation / synthesis unit 20 sends the voice data and the terminal data of FIG. 4A to the HSD data interface 14 as the HSD data of FIG. 4B according to an instruction from the terminal control unit 9. At this time, as shown in FIG. 2, the terminal control unit 9 sets the voice data communication rate to 0 bps for the multiplexing / demultiplexing control unit 19 and displays the moving image in the portion excluding FAS and BAS of the first channel, and the second channel. HSD data (voice data 6
4 Kbps).

H. In the 221 frames, the HSD data is allowed to have a structure without FAS and BAS, so that the frame structure as described above is possible. Further, for example, the terminal control unit 9 may use CCITT Recommendation H.264 shown in Table 1. A BAS code that is understood by the other party than that defined in 221 is used, and the other party is notified that the voice data has been transmitted as HSD data and the bit allocation within the frame. As the BAS code, for example, the code shown in FIG. 3 can be considered. The method of notifying the other party is not necessarily based on this. Further, when the notification of the voice communication at the communication rate of 64 Kbps is received from the partner terminal, the reception mode is changed by the same operation as above.

In an N-channel configuration of two or more channels, the HSD data is FAS and BAS from the Nth channel of the highest order to the second channel in order of the lower order.
It is possible to allocate bits in units of 64 Kbps. Therefore, when allocating audio data 64 Kbps and terminal data 64 Kbps converted into HSD data to the (N-1) th channel and the Nth channel, respectively, as shown in FIG. By arranging them, as shown in FIG. 5, for example, as a bit allocation, a frame structure of 64 Kbps voice for the (N-1) th channel and 64 Kbps data for the Nth channel becomes possible.

[0019]

As described above, according to the present invention, the audio data is synthesized and separated from the terminal data and communicated with each other. Since a voice signal exceeding 56 Kbps can be transmitted with the 221 frame structure, an effect is obtained that the degree of freedom is expanded in the structure of a multiplexed frame for moving images, voice, data, and the like.

[Brief description of drawings]

FIG. 1 is a functional block diagram of a multimedia communication device according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a frame structure of a 2B line according to the present invention.

FIG. 3 is a diagram showing an example of a BAS code of a 2B line according to the present invention.

FIG. 4 (a) is a diagram showing an example of voice data and terminal data input to the HSD separation / synthesis unit in the multimedia communication device of the embodiment of the present invention; and (b) Multimedia of the embodiment of the present invention. The figure which shows an example of the HSD data output from the HSD separation / synthesis unit in the communication device.

FIG. 5 is a diagram showing an arrangement example of HSD data in a frame according to the present invention.

FIG. 6 is a functional block diagram of a conventional multimedia communication device.

FIG. 7 is a diagram showing an example of a frame structure of a 2B line in a conventional example.

[Explanation of symbols]

 1 camera 2 microphone 3 speaker 4 key operation unit 5 monitor 6 data terminal 7 voice codec unit 8 video codec unit 9 terminal control unit 10 multiplexing / separating unit 11 voice data interface 12 video data interface 13 LSD data interface 14 HSD data interface 15 call Control processing unit 16 Line interface 17 ISDN 18 Data terminal interface 19 Multiplexing / separating control unit 20 HSD data separating / synthesizing unit 21 Voice data switching unit

Claims (1)

[Claims] 1. A line interface for controlling communication through a line, a call control processing unit for controlling a call with a partner terminal through the line interface, and video data, voice data, LSD data and HSD data of the own terminal. A multiplexing / separating unit that multiplexes and transmits to the partner terminal through the line interface and separates the data received from the partner terminal through the line interface, and a moving image that performs compression encoding and decompression decoding of image signals. A codec section, an audio codec section that performs compression encoding and decompression decoding of an audio signal, an audio data interface that exchanges audio data between the audio codec section and the multiplexing / demultiplexing section, and a data terminal Data terminal interface for controlling transmission and reception of data, and the data terminal An LSD data interface and an HSD data interface for exchanging LSD data and HSD data between an interface and the multiplexer / demultiplexer, the data terminal interface, and the HS.
Connected between the D data interfaces, the data from the data terminal interface and the voice data from the voice codec unit are combined to form the HSD data as the HSD.
The data is sent to the data interface, and the HSD data from the HSD data interface is transferred to the voice data and the HS.
Audio data switching for switching between HSD data separating / synthesizing unit for separating D data and voice data exchange with the audio codec unit for either of the audio data interface and the HSD data separating / synthesizing unit according to an instruction input by a user. And a terminal control unit for managing and controlling the call control processing unit, the multiplexing / demultiplexing unit, the HSD data demultiplexing / synthesizing unit, and the voice data switching unit according to an instruction input by the user. Multimedia communication device.