EP0509805A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Video signal processing apparatus

Assignee: Sony Corp

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Filing: 1992-04-15

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Granted: —

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Expires: 2012-04-15

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Abstract

Abstract In a video signal processing apparatus, a video signal channel-selected and received by a tuner is supplied through a switch to a video output circuit and a signal from the video output circuit is supplied to a cathode ray tube (CRT), thereby being displayed on a picture screen of the CRT. Also, the video signal from the tuner is supplied to a non-signal detecting circuit and a control signal from the non-signal detecting circuit is supplied to the video memory and the switch. Then, when there is not a video signal, the switch is changed in position to allow the signal stored in the video memory to be output. Therefore, a picture displayed when there is not the video signal can be stabilized.

Inventors

👤 Toshiyuki Ogura
👤 Osamu Sugiyama

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-11-05 06:08

CPC Classifications

H; H04; H04N; H04N5/00; H04N5/44; H04N5/52; H04N5/4448

Claims Analysis

Total Claims: 4

Claim 1

Independent Claim 139 words

A video signal processing apparatus comprising: (a) means for receiving a video signal; (b) a memory for storing a signal having a horizontal synchronizing (sync.) signal and a vertical sync. signal from said receiving means; (c) switching means for transmitting said video signal from said receiving means or said signal stored in said memory; (d) detecting means for detecting whether or not there is said video signal output from said receiving means and controlling the change of said switching means so that the signal having a horizontal sync. signal and a vertical sync. signal stored in said memory is transmitted when there is not a video signal in the signal output from said receiving means; and (e) means for selectively supplying said video signal from said receiving means or said signal from said memory to a cathode ray tube.

Claim 2

Dependent Claim 27 words

The video signal processing apparatus according to claim 1, further comprising means for informing a condition that the video signal stored in said memory is being transmitted.

Claim 3

Dependent Claim 117 words

A video signal processing apparatus comprising; (a) means for receiving a video signal; (b) a memory for storing a signal having a horizontal synchronizing (sync.) signal and a vertical sync. signal from said receiving means; (c) switching means for transmitting said video signal from said receiving means; (d) control means, responsive to a channel turning signal, for supplying a control signal to said receiving means, said memory and said switching means so that said receiving means tunes a desired channel and switching means transmit said signal stored in said memory during a prescribed period; and (e) means for supplying said video signal from said receiving means or said signal from said memory to a cathode ray tube.

Claim 4

Dependent Claim 106 words

A video signal processing apparatus for an extended definition television (EDTV) comprising; (a) means for receiving a video signal; (b) means for changing the frequency of said video signal into the frequency of scanning lines for said EDTV; (c) means for supplying said signal having a changed frequency and stored in a memory to a cathode ray tube; and (d) detecting means for detecting whether or not there is said video signal in the signal output from said receiving means and keeping said signal in the memory on a still condition when there is not a video signal in the signal output from said receiving means.

References Cited (Backward Citations)

US4853765A Cited

GB2219463A Cited

GB2221363A Cited

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