JPH04248792A - Subscriber video transmission system - Google Patents

Abstract

PURPOSE:To immediately recognize whether or not the unarrival of a video signal is due to input power supply interruption of a subscriber's equipment when the video signal does not arrive in a reception point in the subscriber video transmission system. CONSTITUTION:A REC INH signal sent at the input interruption of a subscriber video transmitter 11 is transferred to an in-station termination receiver 12. The in-station termination receiver 12 latches the REC INH signal and transfers it to an in-station termination transmitter 13. The in-station termination transmitter 13 stores the REC INH signal and transfers it to a subscriber video receiver 14. The subscriber video receiver 14 stores the REC INH signal and sends it. When power of the subscriber video transmitter 11 is turned on, the REC INH signal is interrupted and the REC INH signal for the devices 12, 13, 14 is released.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video transmission system, and more particularly to a method for transmitting a REC INH (input disconnection alarm inhibit) signal that is issued when input power to equipment installed in a subscriber's premises is interrupted.

0002

[Prior Art] Conventionally, in subscriber video transmission systems, RE
There is no known example in which a method of transferring the CINH signal is adopted.

0003

[Problems to be Solved by the Invention] As mentioned above, conventional subscriber video transmission systems have not adopted a method of transferring the REC INH signal, so when the video signal has not arrived at the receiving point, It was not possible to determine whether this was due to a power outage to the in-house equipment or a failure.

The present invention has been made in view of the above-mentioned conventional circumstances, and therefore, an object of the present invention is to provide a new subscriber video transmission system that makes it possible to solve the above-mentioned problems inherent in the conventional technology. It is about providing.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the subscriber video transmission system according to the present invention transmits the REC INH signal, which is sent out when the input power of the home video transmitting device is cut off, after receiving the REC INH signal in the home video transmitting device. It is characterized by being transferred to the next stage device and finally to the home video receiving device.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a subscriber video transmission system according to the present invention.

Referring to FIG. 1, an embodiment of the subscriber video transmission system according to the present invention includes an in-home video transmission device 11,
It is composed of an in-office terminal receiving device 12, an in-office terminal transmitting device 13, and an in-house video receiving device 14.

As for the flow of the video signal, first, the video signal from the camera passes through the in-home video transmitter 11, is transmitted as an optical digital signal, is received by the in-office terminal receiver 12, and is then relayed as a bipolar electrical signal. connected to the system. Thereafter, the signal that has passed through the relay system is converted into an optical digital signal through an in-office terminal transmitter 13, and then converted back into a video signal by an in-house video receiver 14 and connected to a monitor.

On the other hand, when the input power is cut off in the home video transmitting device 11, the REC INH signal is inserted into a specific bit of the optical digital signal and transferred to the local terminal receiving device 12. In the local terminal receiving device 12, R
When it is determined that the EC INH signal has been received, it is held and transferred to the next-stage intra-office termination transmitter 13. In the same way as in the case of the intra-office terminal receiving apparatus 12, when the intra-office terminal transmitting apparatus 13 determines that it has received the REC INH signal, it holds it and transfers it to the next-stage indoor video receiving apparatus 14. When the home video receiving device 14 determines that it has received the REC INH signal, it holds and issues the REC INH signal. Then, when the input power is turned ON in the home video transmitting device 11, the REC INH signal is disconnected, and accordingly, the REC INH signal is turned off in the home end receiving device 12, the home end transmitting device 13, and the home video receiving device 14.
INH will be canceled.

[0011]

[Effects of the Invention] As explained above, according to the present invention,
The REC INH signal sent when the input power to the home device is turned off is ultimately transferred to the home video receiving device, so if the video signal does not arrive at the receiving point, it is possible to confirm that it is not due to the input power being cut off to the home device. The effect is that you can immediately know whether the

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram showing one embodiment of the present invention.

[Explanation of symbols]

11...In-home video transmission device 12...Internal terminal receiving device 13... In-office terminal transmitter 14...In-house video receiving device

Claims (1)

[Claims] Claim 1: In a subscriber video transmission system comprising an in-home video transmitting device, an in-office device, and an in-home video receiving device, the in-office device transmits a REC INH signal transmitted when the input power of the in-home video transmitting device is cut off. A subscriber video transmission system characterized in that after receiving the video, the video is transferred to the next device and finally to the home video receiving device.