JPS5929815U - noise reduction circuit - Google Patents

noise reduction circuit

Info

Publication number
JPS5929815U
JPS5929815U JP12520982U JP12520982U JPS5929815U JP S5929815 U JPS5929815 U JP S5929815U JP 12520982 U JP12520982 U JP 12520982U JP 12520982 U JP12520982 U JP 12520982U JP S5929815 U JPS5929815 U JP S5929815U
Authority
JP
Japan
Prior art keywords
circuit
noise reduction
generates
detection
reproduction amplifier
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
JP12520982U
Other languages
Japanese (ja)
Inventor
宏紀 清水
Original Assignee
日本ビクター株式会社
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 日本ビクター株式会社 filed Critical 日本ビクター株式会社
Priority to JP12520982U priority Critical patent/JPS5929815U/en
Publication of JPS5929815U publication Critical patent/JPS5929815U/en
Pending legal-status Critical Current

Links

Landscapes

  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Amplifiers (AREA)

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) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

第１図は従来のテープレコーダの再生アンプの入出力特
性の一例を示す図、第２図は本考案回路の一実施例を示
す回路図、第３図は第２図図示回路の入出力特性の一例
を示す図である。 １・・・・・・磁気テープ、２・・・・・・磁気ヘッド
、３・・・・・・再生アンプの前段アンプ、４・・・・
・・再生アンプの後段アンプ、５・・・・・・出力端子
、７・・・・・・包絡線検波回路、８・・・・・・積分
回路、９・・・・・・コンパレータ、１０・・・・・・
基準電圧源、Ｑ・・・・・・スイッチング用ＮＰＮ　）
ランジスタ、Ｄｌ、Ｄ２・・・・・・整流用ダイオード
。Fig. 1 is a diagram showing an example of the input/output characteristics of a conventional tape recorder playback amplifier, Fig. 2 is a circuit diagram showing an embodiment of the circuit of the present invention, and Fig. 3 is the input/output characteristics of the circuit shown in Fig. 2. It is a figure showing an example. 1...Magnetic tape, 2...Magnetic head, 3...Pre-stage amplifier of playback amplifier, 4...
...Amplifier after the reproduction amplifier, 5...Output terminal, 7...Envelope detection circuit, 8...Integrator circuit, 9...Comparator, 10・・・・・・
Reference voltage source, Q...NPN for switching)
Ransistor, Dl, D2... Rectifier diode.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 再生された音声信号を所要レベルに増幅して出力する再
生アンプの前段の出力信号の包路線に応じた検波電圧を
発生する検波回路と、該検波回路の出力検波電圧と基準
電圧とを夫々レベル比較し該再生アンプ前段の出力信号
レベルが零又は極め□　　て小なる期間が一定時間以上
継続したときにミューティング用信号を発生する比較回
路と、該ミューティング用信号により該再生アンプの後
段の出力信号を遮断するスイッチ回路とより構成した雑
音低減回路。A detection circuit that generates a detection voltage according to the envelope of the output signal of the previous stage of the reproduction amplifier that amplifies and outputs the reproduced audio signal to a required level, and a detection circuit that sets the output detection voltage and reference voltage of the detection circuit at respective levels. A comparator circuit that generates a muting signal when the output signal level of the front stage of the reproduction amplifier continues for a certain period of time or more, and a comparison circuit that generates a muting signal when the output signal level of the front stage of the reproduction amplifier is zero or extremely low. A noise reduction circuit consisting of a switch circuit that blocks output signals and a noise reduction circuit.
JP12520982U 1982-08-19 1982-08-19 noise reduction circuit Pending JPS5929815U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12520982U JPS5929815U (en) 1982-08-19 1982-08-19 noise reduction circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12520982U JPS5929815U (en) 1982-08-19 1982-08-19 noise reduction circuit

Publications (1)

Publication Number Publication Date
JPS5929815U true JPS5929815U (en) 1984-02-24

Family

ID=30285159

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12520982U Pending JPS5929815U (en) 1982-08-19 1982-08-19 noise reduction circuit

Country Status (1)

Country Link
JP (1) JPS5929815U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0276169A (en) * 1988-09-13 1990-03-15 Asahi Optical Co Ltd Mode discriminator
JP2011130253A (en) * 2009-12-18 2011-06-30 Funai Electric Co Ltd Sound signal processing apparatus and sound reproducing device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54158208A (en) * 1978-06-02 1979-12-13 Nec Corp Auto-muting circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54158208A (en) * 1978-06-02 1979-12-13 Nec Corp Auto-muting circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0276169A (en) * 1988-09-13 1990-03-15 Asahi Optical Co Ltd Mode discriminator
JP2011130253A (en) * 2009-12-18 2011-06-30 Funai Electric Co Ltd Sound signal processing apparatus and sound reproducing device

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