JPH028267U

JPH028267U -

Info

Publication number: JPH028267U
Application number: JP1988087089U
Authority: JP
Priority date: 1988-06-30
Filing date: 1988-06-30
Publication date: 1990-01-19

Description

[Brief explanation of drawings]

第１図は、この考案のテレビジヨン受像機の一
実施例を示す概略回路構成図、第２図は、第１図
に示した自動利得制御回路における入力電界強度
とＡＧＣ電圧の関係を示す図、第３図は、従来の
テレビジヨン受像機の一例を示す概略回路構成図
、第４図は、第３図に示した回路各部の信号波形
図である。１０……自動選局回路、１１……アンドゲート
回路、１３……同期分離回路、１４……フライバ
ツクトランス、２１……テレビジヨン受像機、２
２……自動利得制御回路、２３……コンパレータ
回路。 FIG. 1 is a schematic circuit diagram showing an embodiment of the television receiver of this invention, and FIG. 2 is a diagram showing the relationship between input electric field strength and AGC voltage in the automatic gain control circuit shown in FIG. , FIG. 3 is a schematic circuit diagram showing an example of a conventional television receiver, and FIG. 4 is a signal waveform diagram of each part of the circuit shown in FIG. 10... Automatic tuning circuit, 11... AND gate circuit, 13... Synchronization separation circuit, 14... Flyback transformer, 21... Television receiver, 2
2... Automatic gain control circuit, 23... Comparator circuit.

Claims

[Scope of utility model registration request]

A television receiver in which the horizontal synchronizing signal separated from the television signal is gated with a flyback pulse generated during the horizontal retrace period, and the presence or absence of the tuned television signal is determined based on the presence or absence of the gate output. an automatic gain control circuit that generates a control signal according to the input electric field strength of the received television signal and controls the gain of the received signal to a fixed value; a comparator circuit that outputs a non-weak electric field detection signal when a certain standard is not met; the non-weak electric field detection signal output from this comparator circuit and the flyback pulse are used as gate signals;
and a gate circuit for gating the horizontal synchronization signal.