JPH02214391A - Video telephone system - Google Patents

Abstract

PURPOSE:To eliminate need for a circuit digitizing an image, a circuit multiplexing or demultiplexing and extracting a transmission signal to each video telephone set and to simplify the constitution by accommodating an optical fiber cable through which a picture is directly sent and received to lines interconnecting video telephone sets and sending the image of the communication opposite party as it is. CONSTITUTION:A reception transmission line 111 and a transmission line 112 are optical fiber cables through which image is sent as a direct optical signal. The transmission reception of an audio signal are of the similar constitution to a conventional system. The image of the opposite party sent from an exchange main body is received by an image optical signal reception circuit 102 in a form of the image by the line 111. An image optical signal reception circuit 102 corrects the received image and amplifies the brightness or the like and sends the result to a display section 101. The image received by the display section 101 is displayed on the screen. Moreover, the image of the talker himself is picked up by a camera 103 and its image is sent to an image optical signal transmission circuit 104. The image optical signal transmission circuit 104 amplifies the brightness of the received image and the image is sent to the transmission line 112 as it is.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a videophone system.

(Prior Art) In a conventional videophone system, an image of a caller is converted into a digital signal and transmitted/received.

FIG. 3 is a diagram showing the main part configuration of a videophone used in a conventional videophone system.

The digitally converted image signal of the other party is received by the image receiving circuit 302 via the reception transmission line 313.

The image receiving circuit 302 extracts the image signal component and the image control signal component contained in the image signal, the image signal component is sent to the display section 301, and the image 1III control signal component is sent to the reception type 1II.
It is sent to the IIIt1 circuit 303. The display unit 301 displays an image indicated by the image signal component at the timing of a synchronization signal based on the image control signal component output by the reception image control circuit 303.

The image of the caller himself is captured by the camera 304, converted into a digital signal by the image transmission circuit 305, and after the control signal component outputted by the transmission image III control circuit 306 is inserted, the image is transferred to the transmission transmission line. 314. The voice of the other party is received by the call transmitter/receiver circuit 311 via the audio line 315 and sent to the receiver 307 via the received signal amplification circuit 308 . The voice of the caller is received by the transmitter 309, electrically converted, and then sent to the voice line 3 via the transmission signal amplification circuit 310 and the telephone transmission/reception circuit 311.
Sent on 15th. Control of the above operations and monitoring of the status of the handset and dial are controlled by the control circuit 312.

[Problem to be solved by the invention]

In the conventional videophone system described above, image transmission is performed using digital signals, and the image signal component and image signal control component are transmitted through the same transmission path, and signals are multiplexed within each videophone during transmission and reception. Since it is necessary to perform separation and extraction, the device configuration and the v-control method become complicated, resulting in a high price.

[Means to solve the problem]

In the videophone system of the present invention, the line connecting the videophones accommodates an optical fiber cable that directly transmits and receives images, and each videophone uses a built-in camera to take an image of the caller using its own phone, and It has an image optical signal transmitting circuit that transmits the image to the optical fiber cable, and an image optical signal receiving circuit that displays the image of the other party on the display unit, which is received via the optical fiber cable.

[Effect]

Since the image is directly transmitted and received by the fiber optic cable, there is no need to provide circuitry for digitizing the image, multiplexing the signals, and separating and extracting the image.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of a video telephone used in the video telephone system of the present invention, and FIG. 2 is an external view thereof.

The video telephone 100 includes a display unit 101 for displaying an image, an image optical signal receiving circuit 102, a camera 103 for photographing the person talking, an image optical signal transmitting circuit 104, a receiver 105, and a transmitter 107. Naru handset 114
, a received signal amplification circuit 106 , and a transmission signal amplification circuit 10
8, a telephone transmission/reception circuit 109, a control circuit 110, a reception transmission line 111, a transmission transmission line 112, and an audio line 113.

In this embodiment, the reception transmission line 111 and the transmission transmission line 112 are optical fiber cables that directly transmit the image as an optical signal. 101 and camera 103, respectively. Voice transmission and reception is the same configuration as before! 105, received signal amplification circuit 1
06, a transmitter 10.7, a transmission signal amplification circuit 108, and a communication transmission/reception circuit 109.

The image of the other party sent from the main body II (not shown) that performs the exchange operation is received by the image optical signal receiving circuit 102 in the form of an image through the reception transmission line 111. The image received by the image optical signal receiving circuit 102 is corrected, its brightness is amplified, etc., and then sent to the display unit 101. The display unit 101 displays the received image on the screen. Further, an image of the caller himself is taken by the camera 103, and the image is sent to the image optical signal transmission circuit 104. Image optical signal transmission circuit 104
amplifies the brightness of the received image and sends it to the transmission transmission line 112, which transmits the image as it is.

It should be noted that control of the above-mentioned transmission and reception operations and monitoring of the status of the handset and buttons are performed by the control circuit 110 as in the prior art.

(Effects of the Invention) As explained above, the present invention has a configuration in which the image of the other party is transmitted as is, thereby providing a circuit for digitizing the image to each videophone and a circuit for multiplexing and separating and extracting the transmitted signal. Since there is no need to provide a video telephone, the configuration becomes simple and the video telephone can be provided at a low cost.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of a video phone used in the video phone system of the present invention, FIG. 2 is an external view thereof, and FIG. 3 is a block diagram showing the configuration of a conventional video phone. be. DESCRIPTION OF SYMBOLS 100... Video telephone, 101... Display part, 102... Image optical signal @reception circuit, 103... Camera, 104... Image optical signal transmission circuit, 105... Receiver, 106... Received signal amplification circuit, 107...
Transmitter, 108... Transmission signal amplification circuit, 109... Call transmission/reception circuit, 110... ti11wJ circuit, 111... Receiving transmission line, 112... Transmitting transmission line, 113... Audio line , 114...Handset.

Claims (1)

[Claims] 1. In the videophone system, the line connecting the videophones accommodates an optical fiber cable that directly transmits and receives images, and each videophone has a built-in image of the caller using its own telephone. A television comprising: an image optical signal transmitting circuit that takes an image with a camera and sends it to the optical fiber cable; and an image optical signal receiving circuit that displays an image of the other party on a display unit, which is received via the optical fiber cable. telephone system.