JPS6066166U

JPS6066166U - Television receiver audio signal receiving circuit

Info

Publication number: JPS6066166U
Application number: JP15946583U
Authority: JP
Inventors: 古屋　重行
Original assignee: 三洋電機株式会社
Priority date: 1983-10-14
Filing date: 1983-10-14
Publication date: 1985-05-10

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図は従来の音声信号受信回路を示す図、第２図は来
者訟の音声信号受信回路を使用したテレビジョン受像機
の一実施例を示す図、第３図はその各部のフィルタ特性
を示す図である。？：ＩＦ選択部、１０，１４：切換回路、１６：ＩＦ変
換部。補正　昭５９．２．２８実用新案登録請求の範囲を次のように補正する。Ｏ実用新案登録請求の範囲（１）チューナと音声ＩＦ増幅回路の間に設けられ１状
態では映像ＩＦキャリア信号及び音声ＩＦ　　＝　　八
せ　　２゛シでＧ　＝２ＩＦ　　西号のみを過させるＩ
Ｆ゛択部と、第１状態では前記音声ＩＦ増幅回路内で映
像ＩＦキャリアー　　２”■Ｆ　、−によって成される
音声インクキャリア信号を導出し、２状態では前記音声
ＩＦ増幅回路から出力される立−ＩＦ＝′　を１゛　え
られる。。　−一によってビートダウンして導出するｌ
Ｆ゛換ユと、このＩＦＦ換部の後段に配置された音声Ｉ
Ｆ検波回路と、前記ＩＦ選選択色ＩＦＦ換部をそれぞれ
連動立すエ第１状態と第２状態に切換える切換回路を備
え、前萌箪１状態では前記■ＦＦ換部からの音声インク
キャリア信号を前記音声ＩＦ検波回路に導入し、第２状
態では前記ＩＦＦ換部かシ上記インクキャリア信号と同
一周波数帯域の音声ＩＦ信号を上記検波回路に導入する
ようにしてなるテレビジョン受像機の音声信号受信回路
。（２）前記切換回路はｄ″ＩＦ　　＝　のの大小に応じ
て切換えられることを特徴とする□　登録請求の範囲第
１項記載の音声信号受信回路。（３）前記ＩＦ選選択色前記映像１旦キャリア信号及び
音声ＩＦ帯域信号をそれぞれ通過せ・しめる音声ＩＦフ
ィルタと前記映像１Ｆキャリア信号を減衰せしめる映像
キャリアトラップの組合せからなり、前記切換回路によ
って前記映像−＋−ｒ丈テトラツブの動作◆不動作が切
換・えられることを特徴とする請求声信号受信回路。Fig. 1 is a diagram showing a conventional audio signal receiving circuit, Fig. 2 is a diagram showing an example of a television receiver using the audio signal receiving circuit proposed by the author, and Fig. 3 is a diagram showing filter characteristics of each part. FIG. ? : IF selection section, 10, 14: switching circuit, 16: IF conversion section. Amendment February 28, 1982 The scope of claims for utility model registration is amended as follows. Scope of Utility Model Registration Claims (1) Provided between the tuner and the audio IF amplification circuit, in one state, the video IF carrier signal and the audio IF = 8, 2, and G = 2 IF.
The F selector derives an audio ink carrier signal formed by the video IF carrier 2''F, - within the audio IF amplification circuit in the first state, and is output from the audio IF amplification circuit in the second state. -IF=' can be obtained by 1. Beat down by -1 and derive l
The F conversion unit and the audio I placed after this IFF conversion unit
It is equipped with a switching circuit that switches the F detection circuit and the IF selection color IFF switching section to the first state and the second state, respectively, and in the first state, the voice ink carrier signal from the FF switching section is provided. is introduced into the audio IF detection circuit, and in a second state, the IFF switching section introduces an audio IF signal in the same frequency band as the ink carrier signal into the detection circuit. receiving circuit. (2) The switching circuit is characterized in that it is switched according to the magnitude of d″IF= □ The audio signal receiving circuit according to the registered claim 1. (3) The IF selection selection color the video 1 It consists of a combination of an audio IF filter that passes and blocks the carrier signal and the audio IF band signal, respectively, and a video carrier trap that attenuates the video 1F carrier signal. A request voice signal receiving circuit characterized in that its operation can be switched.

Claims

[Scope of utility model registration request]

(1) An IP selection section that is provided between the tuner and the audio IF amplifier circuit and is switched between a first state in which the video carrier band and the audio IF band are passed through, and a second state in which only the video carrier band is passed, and the audio An IF that is provided after the IF amplifier circuit and is switched between a first state in which the audio IF signal from the amplifier circuit is derived by obtaining a local oscillation signal and frequency converted, and a second state in which the output signal after this frequency conversion is not derived. A conversion section, an audio IF detection circuit disposed after the IF conversion section, and a switching circuit for switching the IF selection section and the IF conversion section to a first state and a second state, respectively, In the first state, the audio ink carrier signal generated in the audio IF amplifier circuit is introduced into the audio IF detection circuit, and in the second state, the audio ink carrier signal output from the IF converter and having the same frequency band as the ink carrier signal is introduced.
An audio signal receiving circuit for a television receiver, which introduces an F signal into the detection circuit.

(2) The billing circuit is characterized in that the switching circuit is switched depending on the magnitude of the received electric field strength of the television signal.

(3) The IF selection section selects the video carrier band and the audio IF. The registration device comprises a combination of an audio IF filter that passes each band and a video IF wrap that attenuates the video carrier band, and the switching circuit switches between operation and non-operation of the video IF wrap. An audio signal receiving circuit according to claim 1.