JPH0662398A - Picture communication terminal equipment - Google Patents

Abstract

PURPOSE:To synchronize in time a voice with a picture, and to maintain a naturalness by providing a data synchronization control part between a multiple separating part, and a voice suppressing part and a picture control part. CONSTITUTION:A picture communication terminal equipment 2 is equipped with a data synchronization control part 6 which detects a time deviation between voice data and picture data respectively having the time information added at every data block based on the time information, and synchronizes the respective data which is provided between a multiple separating part 5, and a voice control part 7 and a picture control part 8. In this case, a transmission side terminal converts a voice inputted from a handset 10 or a microphone 11 into voice data for a communication by the voice control part 7, and transmits the voice data to the data synchronization control part 6. And also, the transmission side terminal converts a picture inputted from a camera 14 into picture data for the communication by the picture control part 8, and transmits the picture data to the data synchronization control part 6. Afterwards, the data are transmitted to the voice control part 7 and the picture control part 8 so as to be simultaneously outputted according to the detected time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image communication terminal device having a multiplex transmission function for image and voice data.

[0002]

2. Description of the Related Art In recent years, CCITT (International Telegraph and Telephone Consultative Committee) has officially made a recommendation of a video coding system, a multiplexing system, and a communication procedure for audiovisual services. Image communication terminal devices such as conference systems and video-phones have been put on the market.

A conventional image communication terminal device will be described below with reference to the drawings. FIG. 3 shows a block diagram of a conventional image communication terminal device. 1 shown in FIG. 3 is a comprehensive service.
A digital network (ISDN) 2 is an image communication terminal device, and is a portion surrounded by a solid line. Reference numeral 3 denotes an overall control unit that controls terminals by key operations and controls the entire system.
Is a line interface unit for controlling communication through ISDN, 5 is a multiplexing unit for transmitting voice data and image data, or a demultiplexing unit for separating received multiplexed data, and 7 is a voice transmitting / receiving unit. Data management and handset 10, microphone 11, speaker 12
An image control unit 8 controls the image data to be transmitted and received, an image control unit 8 controls the monitor 13, the camera 14, and the like, and a key operation unit 9.

The operation of the conventional image communication terminal device configured as described above will be described below. First, in the case of reception, the multiplexed data is received from the ISDN 1 through the line interface unit 4, and the demultiplexing unit 5 separates the image data and the audio data. The respective separated data are sent to the voice control unit 7 and the image control unit 8, the voice data is converted into data output as voice, and then output from the speaker 12, and the image data is output as an image. After being converted into data, it is output to the monitor 13.

In the case of transmission, the voice input from the microphone 11 is converted into voice data for communication by the voice control unit 7, and the image input from the camera 14 is converted by the image control unit 8 for communication. After being converted into image data and multiplexed by the demultiplexing unit 5, the data is transmitted to the ISDN 1 through the line interface unit 4.

[0006]

However, in the above-mentioned conventional image communication terminal device, since the image data has a large amount of data and the time for data processing becomes long as compared with the voice data, the case where the image data is output at the receiving side terminal. However, there is a problem in that the image is delayed with respect to the voice, and a time difference occurs between the voice and the image, which impairs the naturalness.

The present invention solves the above problems and provides an image communication terminal device capable of eliminating a temporal shift of a voice image due to a delay in data processing or the like and synchronizing the voice and the image temporally. It is an object.

[0008]

According to the present invention, a conventional image communication terminal device detects a time lag between audio data and image data, each of which has time information added to each data block, based on the time information. However, a data synchronization control unit for synchronizing the respective data is provided between the demultiplexing unit and the audio control unit and image control unit.

[0009]

According to the present invention, the provision of the data synchronization control section eliminates the time lag between the voice and the image due to the delay of the data processing, etc., and synchronizes the voice and the image temporally to maintain the naturalness. You can

[0010]

1 is a block diagram of an image communication terminal device according to an embodiment of the present invention, and FIG. 2 is a block diagram of communication data according to the present embodiment.

As shown in FIG. 1, the time lag between the audio data and the image data, each of which has time information added to each data block in the conventional image communication terminal device 2 of FIG. 3, is detected based on the time information. It has a data synchronization control unit 6 for synchronizing the respective data, and is provided between the demultiplexing unit 5, the audio control unit 7 and the image control unit 8.

Other than the above, the same functional blocks as those in FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted.

The structure of voice data and image data communicated by the image communication terminal device shown in FIG. 1 will be described with reference to FIG. A1 to A4 shown in FIG. 2 are the respective data blocks obtained by dividing the audio data into certain units, and B
Reference numerals 1 to B3 are respective data blocks obtained by dividing the image data into certain units. Further, the portions indicated by a to d are time information areas added to the respective data blocks in order to synchronize the sound and the image in time, and the information indicating the time of the data is stored in this area. To do.

For example, in audio data A1 and image data B1, information "Ta" indicating the same time is stored in the time information area, which is the same in audio data block A1 and image data block B1. This means that it is time data.

Next, the operation of the screen communication terminal device of FIG. 1 will be described. Since the transmitting side and the receiving side have the same configuration, FIG. 1 is also used. First, the sender terminal is the handset
The voice control unit 7 outputs the voice input from the microphone 10 or the microphone 11.
Data synchronization control unit 6 by converting into voice data for communication with
Send to. Further, the image input from the camera 14 is converted into image data for communication by the image control unit 8 and sent to the data synchronization control unit 6.

The data synchronization control unit 6 divides each received data into data blocks as shown in FIG. 2, stores the times of the data in the time information areas a to d, and sends them to the demultiplexing unit 5. The demultiplexing unit 5 multiplexes the respective data and transmits it to the ISDN 1 through the line interface unit 4.

The receiving side terminal receives data from the ISDN 1 through the line interface section 4, and the demultiplexing section 5
Send data to. The demultiplexing unit 5 demultiplexes the multiplexed data into respective data, and sends the data to the data synchronization control unit 6. In order to synchronize the audio data and the image data, the data synchronization control unit 6 temporarily stores the data in a memory or the like, detects and analyzes the time information areas a to d of the received data, and determines the time of each data. Detect.

After that, when the detected times are matched, the respective data are sent to the audio control section 7 and the image control section 8 so that the audio data and the image data are output at the same time. The voice control unit 7 that receives the voice data converts the voice data into data to be output as voice, and outputs the data to the handset 10 or the speaker 12.

The image control unit 8 which receives the image data converts the image data into data to be output as an image, and a monitor
Output to 14. By performing the data transfer by the above method, the time delay between the audio data and the image data is eliminated, and the respective data can be synchronized.

[0020]

As described above, in the image communication terminal device of the present invention, information indicating the time is added to the voice data and the image data at the transmission side terminal, and the time information is added at the data synchronization control unit of the reception side terminal. By detecting and synchronizing, it is possible to eliminate the time lag between the output of voice and the output of image.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an image communication terminal device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of communication data according to the present embodiment.

FIG. 3 is a configuration diagram of a conventional image communication terminal device.

[Explanation of symbols]

1 ... ISDN, 2 ... Image communication terminal device, 3 ... Overall control unit, 4 ... Line interface unit, 5 ... Demultiplexing unit, 6 ... Data synchronization control unit, 7 ... Voice control unit, 8
... Image control section, 9 ... Key operation section, 10 ... Handset, 11 ... Microphone, 12 ... Speaker, 13 ... Monitor, 14
…camera.

Claims (1)

[Claims] 1. A line interface unit for controlling a line interface for communication through a comprehensive service digital network, and data such as image and voice are multiplexed,
Alternatively, a demultiplexing unit that separates multiplexed data, a voice control unit that controls a handset, a microphone, a speaker, and the like and a voice data, and an image control unit that controls a monitor, a camera, and the like and an image data And an image communication terminal device having an overall control unit for controlling the entire image communication terminal device, based on the time information, the time difference between the audio data and the image data each having the time information added to each data block. An image communication terminal device, comprising: a data synchronization control unit that detects each of the data and synchronizes the respective data between the demultiplexing unit, the voice control unit, and the image control unit.