JPS6347672U

JPS6347672U -

Info

Publication number: JPS6347672U
Application number: JP14129686U
Authority: JP
Priority date: 1986-09-17
Filing date: 1986-09-17
Publication date: 1988-03-31

Description

[Brief explanation of the drawing]

第１図は本考案の輝度信号のノイズ低減回路の
一実施例を示したブロツク図、第２図は第１図に
示した回路の動作波形図、第３図は再生輝度信号
に含まれるノイズ成分レベルとノイズレベル検出
信号及びノイズレベル検出信号と第１図に示した
ノイズレベル検出回路との関係を示した特性図で
ある。１……ハイパスフイルタ、２……振幅制限器、
３……可変利得増幅器、４……ローパスフイルタ
、減衰及び位相補償回路、５……加算器、６……
ノイズレベル検出回路。 Fig. 1 is a block diagram showing an embodiment of the luminance signal noise reduction circuit of the present invention, Fig. 2 is an operating waveform diagram of the circuit shown in Fig. 1, and Fig. 3 shows noise contained in the reproduced luminance signal. 2 is a characteristic diagram showing the relationship between a component level, a noise level detection signal, and a noise level detection signal and the noise level detection circuit shown in FIG. 1. FIG. 1... High pass filter, 2... Amplitude limiter,
3... Variable gain amplifier, 4... Low pass filter, attenuation and phase compensation circuit, 5... Adder, 6...
Noise level detection circuit.

Claims

[Scope of utility model registration request]

A noise reduction circuit for a reproduced luminance signal that extracts a noise component from the reproduced luminance signal, adjusts the level and phase of the extracted noise component, and adds it to the reproduced luminance signal to reduce the noise component of the reproduced luminance signal. a noise level detection means for detecting the magnitude of the noise component of the reproduced luminance signal;
A noise reduction circuit for a reproduced luminance signal, comprising: noise reduction ratio control means for varying the level of the extracted noise component to be added to the original reproduced luminance signal depending on the magnitude of the noise component.