JPS6338472U - - Google Patents

Description

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

第１図は本考案の実施例を示すブロツク図、第
２図は第１の従来方式を示すブロツク図、第３図
は第２の従来方式を示すブロツク図、第４図はＰ
ＡＬ方式用のＩＦ帯域フイルタの特性図、第５図
はＡＦＣ信号のＳ字特性図、第６図はＮＴＳＣ方
式の放送選局時のＩＦ処理回路の特性図である。 ２……チユーナ、３……ＰＡＬ ＩＦ処理回路
、５……ＰＡＬ用ＩＦ帯域フイルタ、１０……Ｎ
ＴＳＣ ＩＦ処理回路、１９……選局装置、２１
……トラツプ回路、２２……コンデンサ、２３…
…インダクタ、２４……スイツチングダイオード
、２５……切換制御端。 Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a block diagram showing the first conventional method, Fig. 3 is a block diagram showing the second conventional method, and Fig. 4 is a block diagram showing the P.
FIG. 5 is a characteristic diagram of the IF band filter for the AL system, FIG. 5 is an S-shaped characteristic diagram of the AFC signal, and FIG. 6 is a characteristic diagram of the IF processing circuit when selecting a broadcasting station in the NTSC system. 2...Tuner, 3...PAL IF processing circuit, 5...PAL IF band filter, 10...N
TSC IF processing circuit, 19...Tuition selection device, 21
...Trap circuit, 22...Capacitor, 23...
...Inductor, 24...Switching diode, 25...Switching control end.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 選局制御電圧を出力する電圧シンセサイザと、
ＰＡＬ方式のテレビチヤンネルとＮＴＳ方式のテ
レビチヤンネルとを共に選局可能であつて、前記
選局制御電圧に応じて選局したチヤンネルの映像
被変調波をＰＡＬ方式の映像中間周波に変換して
出力するチユーナと、映像信号およびＰＡＬ方式
の音声中間周波を得る第１の中間周波処理回路と
、映像信号およびＮＴＳＣ方式の音声中間周波を
得る第２の中間周波処理回路とから成るテレビ受
像機において、ＮＴＳＣ方式のテンビチヤンネル
選局時に音声中間周波を減衰させＰＡＬ方式のテ
レビチヤンネル選局時に切り離されるトラツプ回
路を前記第１の中間周波処理回路に備え、前記第
１の中間周波処理回路から前記映像中間周波のレ
ベルおよび周波数に応じたＡＧＣ信号およびＡＦ
Ｃ信号を出力し、これらＡＧＣ信号及びＡＦＣ信
号の一方あるいは両方によつて前記電圧シンセサ
イザ及び前記チユーナを制御することを特徴とす
るＰＡＬ／ＮＴＳＣ共用のテレビ受像機。 a voltage synthesizer that outputs a tuning control voltage;
It is possible to select both a PAL system television channel and an NTS system television channel, and converts the video modulated wave of the selected channel into a PAL system video intermediate frequency according to the tuning control voltage and outputs it. a first intermediate frequency processing circuit for obtaining a video signal and an audio intermediate frequency of the PAL system, and a second intermediate frequency processing circuit for obtaining a video signal and an audio intermediate frequency of the NTSC system, The first intermediate frequency processing circuit includes a trap circuit that attenuates the audio intermediate frequency when selecting a television channel in the NTSC system and is disconnected when selecting a television channel in the PAL system, AGC signal and AF according to frequency level and frequency
1. A PAL/NTSC common television receiver, characterized in that the voltage synthesizer and the tuner are controlled by one or both of the AGC signal and the AFC signal.