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JPS6266778A - Noise eliminating circuit for television receiver - Google Patents

Noise eliminating circuit for television receiver

Info

Publication number
JPS6266778A
JPS6266778A JP20600985A JP20600985A JPS6266778A JP S6266778 A JPS6266778 A JP S6266778A JP 20600985 A JP20600985 A JP 20600985A JP 20600985 A JP20600985 A JP 20600985A JP S6266778 A JPS6266778 A JP S6266778A
Authority
JP
Japan
Prior art keywords
circuit
signals
transistor
synchronization signal
sound
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
JP20600985A
Other languages
Japanese (ja)
Inventor
Yoji Yurugi
洋二 万木
Kinya Fukuda
福田 欽弥
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu General Ltd
Original Assignee
Fujitsu General Ltd
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 by Fujitsu General Ltd filed Critical Fujitsu General Ltd
Priority to JP20600985A priority Critical patent/JPS6266778A/en
Publication of JPS6266778A publication Critical patent/JPS6266778A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To eliminate noise generated in vacant channel position when changing channel by operating a sound muting circuit by a switching circuit that makes on or off according to presence or absence of synchronizing signals. CONSTITUTION:A synchronizing signal separation circuit 2 separates vertical synchronizing signals from video signals inputted to an input terminal 1 and sends the signals to a switching circuit 4 through an amplifier circuit 3. The switching circuit 4 makes a transistor 5 of a sound muting circuit 9 according to presence or absence of vertical synchronizing signals. Sound control signals are supplied to an attenuator 14 through a terminal 10, resistors 11, 12 and a transistor 13, and control sound signals from a sound input terminal 17. As synchronizing signals are not detected when vacant channel is selected, the transistor 5 is made on and the transistor 13 is made off, and noise from the terminal 17 is eliminated.

Description

【発明の詳細な説明】 「産業上の利用分野」 本発明はテレビジョン受像機の空きチャンネル選択時に
発生する雑音を消去するための雑音消去回路に関するも
のである。
DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a noise canceling circuit for canceling noise generated when a television receiver selects an available channel.

「従来の技術」 テレビジョン受像機において、空きチャンネルを選択す
ると、「ザアー」という極めて耳ざわりな雑音が発生す
るが、従来はこれを消去する回路を備えていなかった。
``Prior Art'' When a television receiver selects an empty channel, it generates an extremely annoying noise called ``zaaah'', but conventional devices have not been equipped with a circuit to eliminate this noise.

「発明が解決しようとする問題点」 チャンネルを変える毎にこの雑音によって不快な感じを
受けるため、空きチャンネルの選択時にはこれを速やか
に消去し、空きチャンネルを通過して放送中のチャンネ
ルを選択したときには再び音声が出るようなものが望ま
れていた。
``Problem that the invention aims to solve'' Every time you change channels, this noise makes you feel uncomfortable, so when you select an empty channel, you immediately erase it, pass through the empty channel, and select the channel that is currently broadcasting. Sometimes it was desired to have something that would make the sound come out again.

r問題点を解決するための手段」 本発明は上述のような問題点を解決するためになされた
もので、映像信号中の同期信号分離回路と、この分離さ
れた同期信号を増幅する回路と、この増幅回路の出力の
有無でオン、オフするスイッチ回路と、このスイッチ回
路により制御される音声ミュート回路とからなるもので
ある。
"Means for Solving the Problems" The present invention has been made to solve the above-mentioned problems, and includes a circuit for separating a synchronization signal in a video signal, a circuit for amplifying the separated synchronization signal, , a switch circuit that turns on and off depending on the presence or absence of an output from this amplifier circuit, and an audio mute circuit that is controlled by this switch circuit.

「作用」 放送中のチャンネルを選択しているときには、映像信号
中に同期信号を有するので、同期信号分離回路によって
同期信号(好ましくは垂直同期信号)が分離検出され、
これが増幅回路で増幅されてスイッチ回路をオンまたは
オフする。すると、音声ミュート回路は不動作状態に制
御され、音声は正常に出力する。
"Operation" When a channel being broadcast is selected, the video signal contains a synchronization signal, so the synchronization signal (preferably the vertical synchronization signal) is separated and detected by the synchronization signal separation circuit.
This is amplified by an amplifier circuit and turns the switch circuit on or off. Then, the audio mute circuit is controlled to be inactive and audio is output normally.

空きチャンネルを選択したときは、同期48号が存在し
ないので、同期信号分離回路から同期信号は検出されず
、スイッチ回路はオフ、またはオンする。すると、音声
ミュート回路が動作して、雑音は消去される。
When an empty channel is selected, since synchronization number 48 does not exist, no synchronization signal is detected from the synchronization signal separation circuit, and the switch circuit is turned off or on. Then, the audio mute circuit operates to eliminate the noise.

「実施例」 以下、本発明の一実施例を図面に基ついて説明する。"Example" An embodiment of the present invention will be described below with reference to the drawings.

(1)は映像信号入力端子で、この入力端子(1)は垂
直同期信号を分離するための同期信号分離回路(2)に
結合され、さらに分離された同期信号を増幅する増幅回
路(3)を経て同期信号がなくなると出力するスイッチ
回路(4)に結合されている。このスイッチ回路(4)
は、トランジスタ(5)、ダイオード(6)および抵抗
(7)(8)からなる音声ミュート回路(9)に結合さ
れている。
(1) is a video signal input terminal, this input terminal (1) is coupled to a synchronization signal separation circuit (2) for separating a vertical synchronization signal, and an amplifier circuit (3) for amplifying the separated synchronization signal. It is coupled to a switch circuit (4) which outputs an output when the synchronization signal disappears. This switch circuit (4)
is coupled to an audio mute circuit (9) consisting of a transistor (5), a diode (6) and resistors (7) and (8).

つぎに、(10)は音量コントロール端子で、この音量
コントロール端子(10)は、抵抗(11)(12)、
音量コントロール用トランジスタ(13)、アッテネー
タ(14)を経て音声出力端子(15)に結合されると
ともに、前記抵抗(it) (12)の接続点に前記音
声ミュート回路(9)が結合されている。 (17)は
音声入力端子、(+B)は電源、(16)はコレクタ抵
抗である。
Next, (10) is a volume control terminal, and this volume control terminal (10) is connected to resistors (11), (12),
It is coupled to an audio output terminal (15) via a volume control transistor (13) and an attenuator (14), and the audio mute circuit (9) is coupled to the connection point of the resistor (IT) (12). . (17) is an audio input terminal, (+B) is a power supply, and (16) is a collector resistor.

以上のような構成において、映像信号入力端子(1)に
、映像信号が送られてきている間は、同期信号分離回路
(2)で垂直同期信号が分離検出され、これが増幅回路
(3)で増幅され、スイッチ回路(11)をオフにし、
音声ミュート回路(9)の1〜ランジスタ(5)をオフ
状態にする。すると、音量コントロール端子(10)に
入力した音量コントロール信号がそのまま音量コントロ
ール用トランジスタ(13)、アッテネータ(14)へ
送られ、音声入力端子(17)からの音声が減衰される
ことなく出力端子(15)へ送られる。
In the above configuration, while a video signal is being sent to the video signal input terminal (1), the vertical synchronization signal is separated and detected by the synchronization signal separation circuit (2), and this is detected by the amplifier circuit (3). is amplified, turns off the switch circuit (11),
1 to transistor (5) of the audio mute circuit (9) are turned off. Then, the volume control signal input to the volume control terminal (10) is sent as is to the volume control transistor (13) and the attenuator (14), and the audio from the audio input terminal (17) is sent to the output terminal (17) without being attenuated. 15).

空きチャンネルを選択したり、映像信号のないチャンネ
ルを通過するとき、映像(ff号大入力端子1)には映
像信号がないので、同期信号分離回路(2)の出力がな
く、増幅回路(3)の出力もない。そのためスイッチ回
路(4)がオンして出力があられれる。このスイッチ回
路(4)の出力により音声ミュート回路(9)のトラン
ジスタ(5)がオンする。すると音量コントロール端子
(10)に入力した音量コントロール信号は、音声ミュ
ート回路(9)のダイオード(6)、1−ランジスタ(
5)を経てアースに逃がされ、トランジスタ(13)や
アッテネータ(14)への出力がなくなり、雑音は消去
される。
When selecting an empty channel or passing through a channel with no video signal, there is no video signal in the video (FF large input terminal 1), so there is no output from the synchronizing signal separation circuit (2), and the amplifier circuit (3) ) is also not output. Therefore, the switch circuit (4) is turned on and the output is turned on. The output of this switch circuit (4) turns on the transistor (5) of the audio mute circuit (9). Then, the volume control signal input to the volume control terminal (10) is transmitted through the diode (6) and the transistor (1) of the audio mute circuit (9).
5) to the ground, and the output to the transistor (13) and attenuator (14) disappears, eliminating the noise.

前記実施例において、同期信号分離回路(2)では垂直
同期信号を分離して利用したが、雑音信号との判別さえ
つけば水平同期信号を分離して利用することもできる。
In the embodiment described above, the vertical synchronizing signal is separated and used in the synchronizing signal separation circuit (2), but it is also possible to separate and use the horizontal synchronizing signal as long as it can be distinguished from noise signals.

前記実施例において、音声ミュート回路(9)により音
量コントロール信号をアースに逃がしたが。
In the embodiment described above, the volume control signal was routed to ground by the audio mute circuit (9).

これに限られるものではなく、音声入力端子(17)の
音声信号を直接アースに逃がしたり、音声増幅回路の動
作を停止するようにしてもよい。
The present invention is not limited to this, and the audio signal at the audio input terminal (17) may be directly released to the ground, or the operation of the audio amplification circuit may be stopped.

「発明の効果」 本発明は上述のように構成したので、チャンネル切換え
の際に空きチャンネルの位置で発生するザアーという大
きな雑音が消去され、不快感f=:なくすことができる
。また1回路構成も簡単で安価である。
"Effects of the Invention" Since the present invention is configured as described above, the loud noise generated at the position of an empty channel when switching channels is eliminated, and the discomfort f=: can be eliminated. Furthermore, the single circuit configuration is simple and inexpensive.

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

図は本発明による雑音消去回路の一実施例を示す電気回
路図である。 (1)・・・映像信号入力端子、(2)・・・同期信号
分離回路。 (3)・・・増幅回路、(4)・・・スイッチ回路、(
9)・・・音声ミュート回路、(10)・・・音量コン
トロール端子、(13)・・・音量コントロール用トラ
ンジスタ、(14)・−・アッテネータ、(15)・・
・音声信号出力端子。
The figure is an electrical circuit diagram showing an embodiment of the noise canceling circuit according to the present invention. (1)...Video signal input terminal, (2)...Sync signal separation circuit. (3)...Amplifier circuit, (4)...Switch circuit, (
9)...Audio mute circuit, (10)...Volume control terminal, (13)...Volume control transistor, (14)...Attenuator, (15)...
・Audio signal output terminal.

Claims (2)

【特許請求の範囲】[Claims] (1)映像信号中の同期信号分離回路と、この分離され
た同期信号を増幅する回路と、この増幅回路の出力の有
無でオン、オフするスイッチ回路と、このスイッチ回路
により制御される音声ミュート回路とからなることを特
徴とするテレビジョン受像機の雑音消去回路。
(1) A synchronization signal separation circuit in the video signal, a circuit that amplifies this separated synchronization signal, a switch circuit that turns on and off depending on the presence or absence of the output of this amplification circuit, and an audio mute that is controlled by this switch circuit. A noise canceling circuit for a television receiver, characterized by comprising a circuit.
(2)同期信号分離回路は映像信号中の垂直同期信号を
分離検出するものからなる特許請求の範囲第1項記載の
テレビジョン受像機の雑音消去回路。
(2) A noise cancellation circuit for a television receiver according to claim 1, wherein the synchronization signal separation circuit separates and detects a vertical synchronization signal in a video signal.
JP20600985A 1985-09-18 1985-09-18 Noise eliminating circuit for television receiver Pending JPS6266778A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20600985A JPS6266778A (en) 1985-09-18 1985-09-18 Noise eliminating circuit for television receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20600985A JPS6266778A (en) 1985-09-18 1985-09-18 Noise eliminating circuit for television receiver

Publications (1)

Publication Number Publication Date
JPS6266778A true JPS6266778A (en) 1987-03-26

Family

ID=16516396

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20600985A Pending JPS6266778A (en) 1985-09-18 1985-09-18 Noise eliminating circuit for television receiver

Country Status (1)

Country Link
JP (1) JPS6266778A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH027720A (en) * 1988-06-27 1990-01-11 Mitsubishi Electric Corp Digital signal receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH027720A (en) * 1988-06-27 1990-01-11 Mitsubishi Electric Corp Digital signal receiver

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