JPH021981U

JPH021981U -

Info

Publication number: JPH021981U
Application number: JP7968788U
Authority: JP
Priority date: 1988-06-16
Filing date: 1988-06-16
Publication date: 1990-01-09

Description

[Brief explanation of drawings]

第１図は本考案の映像信号変換回路の一実施例
の回路図、第２図はＣ信号検出回路のブロツク図
、第３図はアダプタの接続を示す概略図である。１〜４……入力端子、５〜８……切換スイツチ
、９〜１２……出力端子、１３……同期信号分離
回路、１４……バーストゲートパルス発生回路、
１５……Ｃ信号検出回路、１６……コンバート回
路、１７……バースト抜取回路、１８……バンド
パスフイルタ、１９……共振回路、２０……積分
回路、２１……比較器。 FIG. 1 is a circuit diagram of an embodiment of the video signal conversion circuit of the present invention, FIG. 2 is a block diagram of a C signal detection circuit, and FIG. 3 is a schematic diagram showing the connection of an adapter. 1-4...Input terminal, 5-8...Selector switch, 9-12...Output terminal, 13...Synchronizing signal separation circuit, 14...Burst gate pulse generation circuit,
15...C signal detection circuit, 16...Conversion circuit, 17...Burst extraction circuit, 18...Band pass filter, 19...Resonance circuit, 20...Integrator circuit, 21...Comparator.

Claims

[Claims for Utility Model Registration] A plurality of video signal input terminals, and a synchronization signal separator that is connected to at least one of the video signal input terminals and separates a synchronization signal from a luminance signal supplied from the video signal input terminal. circuit, a burst gate pulse generation circuit which is supplied with a synchronization signal from the synchronization signal separation circuit and outputs a burst gate pulse, and which is connected to two or more of the plurality of video signal input terminals and supplied from these input terminals. An RGB converter circuit converts the luminance signal and carrier signal into the three primary color signals of R, G, and B and outputs them together with the luminance signal, the carrier color signal supplied from the input terminal, and the burst gate pulse generation circuit. A color signal detection circuit that outputs different levels depending on whether the burst gate pulses are supplied at the same time or not, and a color signal detection circuit that outputs different levels depending on whether the burst gate pulses are supplied at the same time or not. When the output is supplied, the above RG
A switch that connects to the B converter circuit and otherwise connects to the plurality of video signal input terminals, and a plurality of video signal output terminals to which the output is supplied from the switch; Automatically determines whether the video signal input to the signal input terminal is a three primary color signal, a separated video signal consisting of a luminance signal and a carrier color signal, or a composite video signal, and when a separated video signal is input. A video signal conversion circuit characterized in that it converts into three primary color signals and outputs the signals, and when other signals are input, outputs them as they are.