JPH0224678U

JPH0224678U -

Info

Publication number: JPH0224678U
Application number: JP10267088U
Authority: JP
Priority date: 1988-08-02
Filing date: 1988-08-02
Publication date: 1990-02-19

Description

[Brief explanation of drawings]

第１図は本考案の実施例のビデオ信号フエード
アウト・フエードイン回路のブロツク図、第２図
は第１図の回路図、第３図は第１図および第２図
の動作を説明するための波形図、第４図は従来例
のブロツク図、第５図は第４図の１部を説明する
ための回路図である。１……直流レベル可変回路、２……電流制御回
路、３……ペデスタルレベルスライス回路、４…
…ブランキング信号、５……フエード制御信号、
６……ビデオ信号フエードアウト・フエードイン
回路、８……ビデオ信号、１５……水平ブランキ
ング期間、１６……映像期間、１７……ペデスタ
ルレベル。 Fig. 1 is a block diagram of a video signal fade-out/fade-in circuit according to an embodiment of the present invention, Fig. 2 is a circuit diagram of Fig. 1, and Fig. 3 is a waveform for explaining the operation of Figs. 1 and 2. 4 is a block diagram of a conventional example, and FIG. 5 is a circuit diagram for explaining a part of FIG. 4. 1... DC level variable circuit, 2... Current control circuit, 3... Pedestal level slice circuit, 4...
...Blanking signal, 5...Fade control signal,
6...Video signal fade-out/fade-in circuit, 8...Video signal, 15...Horizontal blanking period, 16...Video period, 17...Pedestal level.

Claims

[Scope of utility model registration request]

In a video signal fade-out/fade-in circuit that controls the level of a video signal according to a control signal, in response to a blanking signal detected from the video signal, any video period other than the blanking period is controlled according to the control signal. current control means for obtaining a current controlled to a current value; a DC level change circuit that responds to the video signal and changes the DC potential of the video signal in accordance with the controlled current of the current control means; and the DC level change circuit. A limiter circuit is provided for limiting a portion of a level located on the opposite side of the white level to the pedestal level to the pedestal level in the video signal area of the video signal sent through the circuit. Video signal fade-out/fade-in circuit.