JPS60254891A - Speech and data communication system - Google Patents

Abstract

PURPOSE:To transmit image data and speech data through the same communication circuit and to economize the communication circuit by switching a circuit for a time specified by an image communication center and sending a speech current within the range of the specified time. CONSTITUTION:When data in format 16 is sent from the image communication center 1' to terminal equipment 4', a display control part 6' receiving the contents of the image data 16 stores data 161 in its internal memory and displays it on the scope of a display part 7'. Then, a control part 14 when detecting a switching command from a switching command part 162 switches the circuit through a switch 15 for T seconds in which a time display part 163 makes a display. At this time, the speech current 17 flows through a communication line 13 and is outputted to a speaker 10' through an audio amplification part 9'. The circuit is switched again through the switch 15 T seconds later and a digital signal is received.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to an audio signal transmission system in an image communication system that transfers images using a telephone communication line.

(2) Prior art and problems Figure 1 shows an example of a system that transfers images using a conventional telephone communication line, where 1 is an image communication center, 2 is a modem, and 3 is a telephone. A switching network, 4 a voice/data terminal, 5 a modem, 6 a display control section, 7 a display section, 8 a keypad, 9 an audio amplification section, 10 a speaker, 11.
12 represents a communication line.

In FIG. 1, image data from an image communication center 1 or input data from a keypad 8 of an audio/data terminal 4 is converted into a voice band FS signal by a modem 2 or a modem 5, respectively, and a communication line 11 and a telephone It is transmitted to the other party via the switching network 3. At this time, the display control section 6 displays the image data transmitted from the image communication center on the display section 7, and also sends the input data from the keypad 8 toward the image communication center.

On the other hand, the audio signal reaches the audio/data terminal from the image communication center 1 via the communication circuit m12 and the telephone switching network 3, and is amplified by the audio amplification section to drive the speaker 10.

When transmitting digital data using a voice band FS signal using a normal telephone communication line, the practical speed is limited to about 9600 bps, but when transmitting voice as a digital signal, , even with the sound quality of a telephone, it is 3
Speeds between 2Kbps and 64 Kbps are required and 9
At 600 bps, only extremely poor quality voice transmission can be performed.

Therefore, in the example shown in FIG. 1, a communication line 12 dedicated to audio signal transmission is installed separately from the communication line 11 for image signal transmission, and audio is sent as an analog signal.

This conventional method requires two communication lines for one terminal, which is economically disadvantageous, and it is also convenient to connect the terminal to one existing telephone line. There was a problem in that it was not possible to configure a system that could be used for

For example, in a system such as Videotex, it is only necessary to send audio of a predetermined length such as an explanation of the screen in one direction from the center to the terminal, but for such audio transmission, K also (3) Purpose of the Invention In view of the above-mentioned drawbacks of the prior art, the present invention provides a method for unidirectional audio transmission where the time length can be predefined. The purpose is to provide a method that is possible using a pair of communication lines (telephone lines).

(4) Structure and object of the invention According to the present invention, as described in the claims, there is provided a circuit for displaying an image on a display device based on a received audio band FS signal, and a circuit for displaying an image on a display device using a received audio band FS signal, and A terminal device that has a circuit that outputs audio, a circuit that switches the received signal to one of the above circuits, and a function that detects a command to switch the circuit from the received signal is connected to the communication line. By connecting to the image communication center via the image communication center, sending a command from the image communication center to instruct that the open circuit should be switched for a specified time, and then sending out an audio current within the range of the specified time. ), is achieved by an audio/data communication system characterized by transmitting and receiving image data and audio data over the same communication line.

(5) Embodiment of the Invention FIG. 2 is a block diagram showing an example of an apparatus for implementing the present invention, in which 17 to lO' are the same as 1 to 10 in FIG. 1, 13 is a communication line, Reference numeral 14 represents a control unit, 15 a switch unit, and 16 a network control unit (NCU).

FIG. 3 is a diagram showing an example of the format of data sent from the image communication center when implementing the present invention, in which 16 is the digital data format, 16□ is the image data section, 16. 16 indicates a switching command section, 16 indicates a time display section, and 17 indicates an audio signal.

When data in the format 16 shown in FIG. 3 is sent from the image communication center 1' to the voice/data terminal 4' in FIG. A screen is displayed on the display section 7' under the control of the display control section 6' that receives the content. and control section 14
When detecting a switching command from the switching command unit 162, audio is sent as a switch analog signal for the time (T seconds) displayed by the time display unit 163, and this is amplified by the audio amplification unit 9' and output to the speaker. 10'. After T seconds have elapsed, the circuit is switched again by the switch section 15 to adopt a configuration for receiving digital signals. The transmitted image data is stored in the screen memory of the display control unit 6', and a still image is displayed on the display unit 7', so even if the image is interrupted during audio transmission, it will not be interrupted. There is nothing to say.

(6) Effects of the Invention As explained in detail above, according to the method of the present invention, an audio signal is transmitted together with image data from an image communication center to an audio/data terminal connected via a pair of communication lines. Since it is possible to realize image communication services economically, the effect is great.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a system for transferring images using a conventional telephone communication line, FIG. 2 is a block diagram showing an example of a device implementing the present invention, and FIG. FIG. 3 is a diagram illustrating an example of the format of data sent from an image communication center when implementing the invention. 1.1... Image communication center, 2, 2'... Modem, 3.3'... Telephone switching network, 4, 4'... Voice/data terminal, 5, 5'... Modem, 6, 6'...
・Display control section, 7.7'...Display section, 8.8'...
Keeper, C, 9, 9'...Audio amplifier section, 10.10
'...Speaker, 11-13...Communication line, 14...
・Control unit, 15... Switch unit, 16... Network control device

Claims (1)

[Claims] A circuit that displays an image on a display device using the received F8 signal in the audio band, a circuit that outputs audio based on the received audio current, a circuit that switches the received signal to one of the above circuits, and a receiving circuit. A terminal device that has the function of detecting a command to switch circuits from a signal should be connected to an image communication center via a communication line, and an open circuit should be switched at a specified time from the image communication center. A voice/data communication method characterized in that image data and voice data are transmitted and received over the same communication line by transmitting a command instructing the above and then transmitting a voice current within the specified time range.