JPH03120985A - Video delivery device - Google Patents

Abstract

PURPOSE:To use the circuit effectively by sending a video signal sent from a video center at a low speed while being stored once upon the request of each subscriber and allowing each subscriber to store the video signal sent at a low speed and to read the signal in real time. CONSTITUTION:Each subscriber 30 operates a key pad 35 to select a video program desired to be viewed, a selection signal sent to a video center 10 is fed to a control section 14 to set a video program indicated by the selection signal. The set video program is stored once in a sender side storage device 13 at an idle time of a line at night or the like, the video signal is read at a lower speed than the real time from the sender side storage device 13 and sent to each subscriber 30 and stored in a receiver side storage device 32 at a low speed. When the sent video program is desired to be viewed at an optional time, a control section 36 reads the stored video program in real time by operating, e.g. the key pad 35 and received on a monitor receiver 34. Thus, the line is used effectively.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a video distribution device that distributes video from a video center side to each subscriber, and particularly relates to a video distribution device that distributes video from a video center side to each subscriber over a narrowband transmission path. The present invention relates to a video distribution device for transmitting to subscribers.

[Conventional technology]

Conventionally, as a system for distributing video from a video center to multiple subscribers, for example, a cable television system (CA) has been used.
? V system) is known.

In conventional video distribution systems such as this CATV system, 1, for example, as described on pages 481 to 483 of "New Edition - Optical Fiber Communication" (Published by Telecommunications Nitei-Ssha, 1981), the transmission Transmission means such as optical fiber cables, which have a relatively wide bandwidth, are used.

[The problem that the invention attempts to solve]

However, a video distribution system such as the CA theme system requires a transmission means capable of transmitting a signal with a wide bandwidth in order to send the video to that point. In addition, we will create more transmission means that can send video as is to each individual subscriber.
The lines are idle during times when transmissions are not being carried out, such as at night.
There has been a problem in that the transmission means is wasted when transmitting wide-bandwidth signals.The object of the present invention is to effectively use such a transmission means for video distribution.

[Means to solve the problem]

In order to achieve the above purpose, the video signals sent from the image center according to the request from each subscriber are stored once and then transmitted at low speed, and each subscriber stores the video signals transmitted at low speed. [Operation] With this K, even if the transmission capacity of the transmission means connected to each subscriber is low, the video signal can be transmitted at a low speed. The line can be used effectively by transmitting video signals, for example, during the night when the line is idle.

〔Example〕

An embodiment of the video distribution apparatus of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates the entire video center, and this video center 10 is equipped with a reproducing section 11 such as a VTR or a video disc reproducing device. The playback unit 11 has video signal O playback controlled by a control unit 14, which will be described later, and supplies the playback video signal to an analog/digital converter (hereinafter referred to as an A/D converter) 12 to convert it into a digital signal. However, the reproduced video signal also includes an audio signal. Then, the digital video signal output from the A/D converter 12 is supplied to the transmitting side storage device 15. This sending side storage device 15
For example, it has a large capacity that can store video signals for a predetermined period of time, and its storage and reading are controlled by the control section 14.

In this case, the video signal is read out from the transmitting side storage device 13 at a low speed that can be transmitted, for example, over a general telephone line. 16 and sends out the transmission line 211Ic using a predetermined transmission method. Also, the transmission line 21 is configured so that a selection signal from each subscriber 30, which will be described later, is transmitted to the video center 10. When the selection signal is transmitted, the transmission/reception signal separation unit 1
After separation in step 6, the signal is supplied to the receiving section 15. Then, the selection signal received by the receiving section 15 is supplied to the control section 1411c, and the video program to be reproduced is controlled in accordance with the selection signal.

The transmission line 21 is connected to each subscriber 50 via a switching device 22, such as an optical fiber cable. On the side of each subscriber 50, the video signal transmitted at low speed through the transmission line 21 is supplied to the reception side storage device 32 via the transmission/reception signal separation section 31, and is stored in the reception side storage device 32 at a low speed. Make me remember. In this case, the receiving side storage device 32 has a large capacity that can store video signals for a predetermined period of time, for example.
Storage and reading are controlled by a control section 56. Then, the video signal read from the receiving side storage device 32 is converted into a digital/analog converter TI (hereinafter referred to as a D/A converter) 3.
3 and converts it into an analog video signal, and supplies the converted video signal to a monitor receiver 54 for image reception.

In addition, 35 in the figure indicates a key bat, and this key bat 5
5 is supplied to the control unit 36, and the control unit 56 supplies a selection signal based on this command to the transmitting unit 57. Then, a selection signal is sent from the transmitting section 37 to the transmission line 21 via the transmitting/receiving signal separating section 31. ◎Explanation of the operation when distributing a video in the video distribution apparatus of this example configured in this way. Then, first, each subscriber operates the keypad 35 to select the video program they wish to view.This selection command is sent to the control unit 36.
The selected signal is then transmitted as a selection signal to the video center 10 via the transmission section 37 and the upper line of the transmission line 21. Then, the selection signal transmitted to the video center 10 is transmitted to the receiving section 15.
The video program is supplied to the control section 14 via the control section 14, and the video program indicated by the 1 selection signal is set. Then, during idle time on the line, such as at night, the set video program is played back from the playback section 10, converted into a digital signal by the A/D converter 12, and then temporarily stored in the sending side storage device 13. At this time, the entire set of video programs may be stored, or short-time video signals may be stored intermittently by performing intermittent playback. Then, the video signal is read out from the transmitting side storage device 15 at a low speed that is slower than real time, and sent to the transmission line 21@.Then, the video signal sent out at this low speed is sent via the exchange device te1
The selection signal is transmitted to the subscriber 30 side that sent the selection signal, and stored in the receiving side storage device 52 at a low speed. At this time, k temporarily stores all one set of video programs in the storage device 52.
After the storage operation in the storage device 32 is completed, when you want to view the transmitted video program, for example, by operating the key bat 35, the control unit 36 can display the stored video program in real time. After being read out and converted to analog by the D/A converter 35, the monitor receiver 54
Image reception is performed at

By distributing video signals in this way, transmission is performed using a transmission line with low transmission capacity, and transmission is performed during idle time on the transmission line, making the line extremely effective. used. Moreover, since only the video programs required by each subscriber can be selectively distributed, there is no waste.

〔Effect of the invention〕

According to the present invention, a video signal is transmitted extremely efficiently using a low-capacity transmission line, so that the transmission @ line can be used effectively.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the video signal distribution device of the present invention.
Sending side storage device, 21... Transmission line, 32... Receiving side storage device, 34... Monitor receiver.

Claims (1)

[Claims] 1. A first storage means for storing video signals sent from the video sensor in response to requests from each subscriber, and a transmission line for transmitting the video signals read out from the first storage means at a slower speed than real time. and a second storage means for storing the video signal transmitted at low speed via the transmission path and reading it out in real time,
A video distribution device capable of distributing video signals from a video center to subscribers by making the video signals read from the second storage means viewable on the subscriber side.