JPH0257678U - - Google Patents

Info

Publication number
JPH0257678U
JPH0257678U JP8874088U JP8874088U JPH0257678U JP H0257678 U JPH0257678 U JP H0257678U JP 8874088 U JP8874088 U JP 8874088U JP 8874088 U JP8874088 U JP 8874088U JP H0257678 U JPH0257678 U JP H0257678U
Authority
JP
Japan
Prior art keywords
signal level
signal
detection circuit
level detection
aft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP8874088U
Other languages
Japanese (ja)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP8874088U priority Critical patent/JPH0257678U/ja
Publication of JPH0257678U publication Critical patent/JPH0257678U/ja
Pending legal-status Critical Current

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Landscapes

  • Television Receiver Circuits (AREA)
  • Circuits Of Receivers In General (AREA)

Description

【図面の簡単な説明】[Brief explanation of drawings]

第1図はこの考案の一実施例になるAFT回路
を示すブロツク構成図、第2図は従来のAFT回
路を示すブロツク構成図、第3図はBPFの通過
帯域特性を示す曲線図、第4図はAFT回路の出
力特性を示す曲線図である。 図において、3はVIF増幅回路、4はAFT
回路、7は信号レベル検出回路、9はスイツチン
グ・トランジスタ、10はスイツチング・ダイオ
ードである。なお、図中同一符号は同一または相
当部分を示す。
FIG. 1 is a block configuration diagram showing an AFT circuit as an embodiment of this invention, FIG. 2 is a block configuration diagram showing a conventional AFT circuit, FIG. 3 is a curve diagram showing the pass band characteristics of BPF, and FIG. The figure is a curve diagram showing the output characteristics of the AFT circuit. In the figure, 3 is a VIF amplifier circuit, 4 is an AFT
7 is a signal level detection circuit, 9 is a switching transistor, and 10 is a switching diode. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

【実用新案登録請求の範囲】 映像中間周波増幅器の出力を受けて局部発振周
波数を制御する局部発振周波数制御(以下「AF
T」という)回路を有するものにおいて、 信号レベルを検出する信号レベル検出回路と、 この信号レベル検出回路の出力に応じて動作す
るスイツチング素子とを備え、上記信号レベルが
弱信号または無信号のときに上記AFT電圧を基
準電圧よりも小さくなるようにしたことを特徴と
するテレビジヨン受像機。
[Claims for Utility Model Registration] Local oscillation frequency control (hereinafter referred to as “AF
A signal level detection circuit that detects a signal level, and a switching element that operates according to the output of this signal level detection circuit, when the signal level is a weak signal or no signal. A television receiver characterized in that the AFT voltage is smaller than a reference voltage.
JP8874088U 1988-07-04 1988-07-04 Pending JPH0257678U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8874088U JPH0257678U (en) 1988-07-04 1988-07-04

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8874088U JPH0257678U (en) 1988-07-04 1988-07-04

Publications (1)

Publication Number Publication Date
JPH0257678U true JPH0257678U (en) 1990-04-25

Family

ID=31313300

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8874088U Pending JPH0257678U (en) 1988-07-04 1988-07-04

Country Status (1)

Country Link
JP (1) JPH0257678U (en)

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