JPH0380655A - Digital picture exchange system - Google Patents

Abstract

PURPOSE:To allow a television receiver being a subscriber terminal equipment to monitor a picture signal by sending a test use picture signal to a subscriber line accommodated in a digital picture exchange. CONSTITUTION:A picture signal generator 2 generates a picture signal being an optional test pattern at all times and the signal is converted into a digital signal by a picture coder 3. On the other hand, a controller 4 always checks the operating state of the digital exchange 1 for each of subscriber lines 5 and when an idle line takes place, an output from the picture coder 3 is sent to the subscriber line 5 and a picture signal decoded by a coder decoder 7 in the subscriber terminal equipment 8 is outputted to a television receiver 8. Thus, the television receiver of the subscriber terminal equipment can monitor the picture signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a digital image exchange system, and more particularly to a digital image exchange system that processes moving image signals between subscriber terminals.

[Conventional technology]

A conventional digital image exchange system stores a specific frame (for example, a 32 Mbit digital signal) inside the exchange.
It had a digital signal generator that generated a specific frame and sent it to the subscriber line.

[Problem to be solved by the invention]

In the conventional image exchange system described above, the encoding/decoding device of the subscriber terminal cannot detect the specific frame as an image signal because it does not match the digital image signal.
The signal line to the V receiver had been cut off. ``With this kind of configuration, even if the power to the terminal device is turned on, an image signal cannot be obtained, and the terminal device cannot determine whether there is an abnormality in the transmission line or the image exchanger. there were.

[Means to solve the problem]

The image exchange system of the present invention includes an image signal generator that generates an analog image signal used for line testing, an image encoder that converts the analog image signal into a digital signal and outputs it, and a digital image signal generator that converts the analog image signal into a digital signal. It has a controller for sending data to subscriber lines accommodated by the digital exchange.

〔Example〕

Next, the present invention will be explained with reference to the drawings. FIG. 1 is a block diagram of one embodiment of the present invention.

In this embodiment, the analog image signal 2a used for line testing is
an image signal generator 2 that generates an analog image signal 2a;
An image encoder 3 that converts the image into a digital image signal 3a and outputs it, and a digital exchanger 1 that converts the digital image signal 3a into a digital image signal 3a.
The controller 4 transmits data to the subscriber line 5 accommodated by the subscriber line 5. Further, in the embodiment described above, the controller 4 may be provided to send the digital image signal 3a to the vacant subscriber line 5 accommodated by the digital exchange 1.

In this way, the image signal generator 2 always generates an image signal of a test pattern for an arbitrary test, and the image encoder 4
is converted into a digital signal.

On the other hand, the controller 4 constantly checks the usage status of each subscriber line 5 of the digital exchange 1, and when a free line occurs, sends the output from the image encoder 3 to the subscriber line 5, and sends the output from the image encoder 3 to the subscriber line 5. , the image signal decoded by the encoding/decoding device 7 can be output to the TV receiver 8.

〔Effect of the invention〕

As explained above, the present invention enables the TV receiver of the subscriber terminal to monitor the image signal by sending the test image signal to the subscriber line housed in the digital image exchanger. It is possible to constantly check whether the line status between image exchangers is good or bad.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention. 1...day digital image exchanger, 2... Image signal generation vessel, 3... Image encoder, 4...controller, 5...Subscriber terminal.

Claims (2)

[Claims] (1) A digital exchange accommodates an image signal generator that generates an analog image signal used for line testing, an image encoder that converts the analog image signal into a digital image signal and outputs it, and the digital image signal. 1. A digital image exchange system comprising: a controller for transmitting data to a subscriber line; 2. The digital switching system according to claim 1, further comprising: (2) means for sending the digital image signal to a vacant subscriber line accommodated by the digital switching equipment.