JPS60114455U

JPS60114455U - Pulse noise removal device for FM receiver

Info

Publication number: JPS60114455U
Application number: JP1984002189U
Authority: JP
Inventors: 天沢　清
Original assignee: クラリオン株式会社
Priority date: 1984-01-11
Filing date: 1984-01-11
Publication date: 1985-08-02
Also published as: JPH0339965Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図はＦＭ受信機用の従来のパルス性ノイズ除去装置
の構成を”示すブロック図、第２図はノイズ除去装置が
ない場合の電界に対するパルス性ノイズの出力レベルを
示すダイヤグラム、第３図は本考案によるＦＭ受信機用
のパルス性ノイズ除去装置の構成を示すブロック図、第
４図は左右のチャンネルの信号の強さが同一である時の
ステレオ・コンポジット信号、それにパイロット信号が
加わった信号およびパルス性ノイズの波形図である。１・・・アンテナ、２・・・チューナ、３・・・パルス
性ノイズ除去装置、４・・・復調回路に至るパルス性ノ
イズ除去装置の出力、５・・・ノイズ検出部、６・・・
パルス性ノイズ検出用高域通過フィルタ、７・・・ノイ
ズ増幅器、８・・・スイッチング・パルス発生回路、９
・・・ノイズ増幅器ＡＧＣ１１０・・・遅延超低域通過
フィルタ、１１・・・ノイズ除去用ゲート、１２・・・
ステレオ信号復調回路、１３・・・ステレオ出力、１４
・・・差動増幅器、１５・・・整流回路、１６・・・平
滑回路、１７・・・感度調節用可変アッテネータ。〜　　　　　　　　　　　　　　！１−［−戸 ■ Ｖ２−ｉ二１１■ （ハ）（電＄犬崖−Figure 1 is a block diagram showing the configuration of a conventional pulse noise removal device for FM receivers, Figure 2 is a diagram showing the output level of pulse noise with respect to the electric field when there is no noise removal device, and Figure 3 Figure 4 is a block diagram showing the configuration of the pulse noise removal device for FM receivers according to the present invention, and Figure 4 shows a stereo composite signal when the signal strengths of the left and right channels are the same, and a pilot signal is added to it. It is a waveform diagram of a signal and pulsed noise. 1... Antenna, 2... Tuner, 3... Pulse noise removing device, 4... Output of the pulsed noise removing device leading to the demodulation circuit, 5 ...Noise detection section, 6...
High-pass filter for pulsed noise detection, 7... Noise amplifier, 8... Switching pulse generation circuit, 9
... Noise amplifier AGC110 ... Delay ultra low-pass filter, 11 ... Noise removal gate, 12 ...
Stereo signal demodulation circuit, 13... Stereo output, 14
... Differential amplifier, 15 ... Rectifier circuit, 16 ... Smoothing circuit, 17 ... Variable attenuator for sensitivity adjustment. ~! 1-[-door■ V2-i211■ (c) (den $ dog cliff-

Claims

[Scope of utility model registration request]

It has a noise detection circuit with variable gain or noise detection threshold of the noise detection section, a differential amplifier that amplifies the difference between the outputs of the left and right channels of the stereo output, and a rectification and smoothing circuit connected to the output of the differential amplifier. , when an output appears in the rectifying and smoothing circuit and stereo reception is detected, the pulse noise detection sensitivity of the noise detection circuit is adjusted to increase. Device.