JPS5890744U

JPS5890744U - FM receiver

Info

Publication number: JPS5890744U
Application number: JP18644281U
Authority: JP
Inventors: 望月　照司
Original assignee: 株式会社東芝
Priority date: 1981-12-15
Filing date: 1981-12-15
Publication date: 1983-06-20

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) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は従来のＦＭ受信機を示す要部の回路構成図、第
２図は第１図の受信態様を説明するための図、第３図は
この考案に係るＦＭ受信機の一実施例を示す要部の回路
構成図、第４図は第３図の帯域ミューティング信号とＡ
ＦＣ電圧との関係を示す図、第５図は第３図のミューテ
ィング信号帯域幅の変化状態を示す図、第６図ａ、　　
ｂは第３図のＡＦＣ動作制御回路部の具体例を示す構成
図である。２１・・・・・・アンテナ同調部、２２・・・・・・高
周波増幅部、２３・・・・・・周波数変換部、２４・・
・・・・中間周波増幅部、２５・・・・・・検波回路部
、２６・・・・・・ＡＦＣ回路部、２７・・・・・・局
部発振回路部、２８・・・・・・ＡＦＣ動作制御回路。Fig. 1 is a circuit diagram of the main parts of a conventional FM receiver, Fig. 2 is a diagram for explaining the reception mode of Fig. 1, and Fig. 3 is an embodiment of the FM receiver according to this invention. 4 is a circuit configuration diagram of the main part showing the band muting signal of FIG. 3 and A
A diagram showing the relationship with the FC voltage, FIG. 5 is a diagram showing the state of change in the muting signal bandwidth in FIG. 3, and FIG. 6a,
b is a configuration diagram showing a specific example of the AFC operation control circuit section of FIG. 3; 21... Antenna tuning section, 22... High frequency amplification section, 23... Frequency conversion section, 24...
...Intermediate frequency amplification section, 25...Detection circuit section, 26...AFC circuit section, 27...Local oscillation circuit section, 28... AFC operation control circuit.

Claims

[Scope of utility model registration request]

In the FM receiver including an AFC circuit, the AF
The C circuit part limits the AFC operating range based on the band muting signal and the switching muting signal, and
An FM receiver characterized in that it is equipped with an AFC operation control circuit that controls FC operation.