JPS5748809A - Muting circuit - Google Patents

Muting circuit

Info

Publication number
JPS5748809A
JPS5748809A JP55124289A JP12428980A JPS5748809A JP S5748809 A JPS5748809 A JP S5748809A JP 55124289 A JP55124289 A JP 55124289A JP 12428980 A JP12428980 A JP 12428980A JP S5748809 A JPS5748809 A JP S5748809A
Authority
JP
Japan
Prior art keywords
muting
circuit
trs
signal
gain
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
JP55124289A
Other languages
Japanese (ja)
Inventor
Yoshiro Kunugi
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.)
Pioneer Corp
Original Assignee
Pioneer Corp
Pioneer Electronic Corp
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 Pioneer Corp, Pioneer Electronic Corp filed Critical Pioneer Corp
Priority to JP55124289A priority Critical patent/JPS5748809A/en
Publication of JPS5748809A publication Critical patent/JPS5748809A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
    • H03F1/305—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in case of switching on or off of a power supply

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE:To obtain a muting circuit which can suppress pop sound to a small value in high speed, by providing a switching means which makes short-circuit the both ends of a resistive element having proportional relation with the gain of an amplifier. CONSTITUTION:A muting circuit 6 consisting of transistors (TR) Q5-Q9 is provided for a PWM amplifier 3 consisting of TRs Q1-Q4 amplifying the output signal of a PWM modulator 2. If no muting signal to the TRQ5 is present, the TRs Q5-Q9 turn off and the amplifier 3 makes normal amplification. When the muting signal to the TRQ5 is at high level, the TRs Q5-Q9 are turned on, and collector resistors R3, R4 proportional to the gain of the TRs Q1, Q2 of the amplifying circuit are in short circuit with the TRs Q8, Q9. Thus, the circuit gain is controlled to zero and no signal is introduced to the output for muting operation. High speed operation is possible to constitute the muting circuit electronically, and since muting is given with the PWM amplification circuit, no pop sound is amplified in comparison with the muting at the first stage of the system, allowing to suppress the pop sound.
JP55124289A 1980-09-08 1980-09-08 Muting circuit Pending JPS5748809A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55124289A JPS5748809A (en) 1980-09-08 1980-09-08 Muting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55124289A JPS5748809A (en) 1980-09-08 1980-09-08 Muting circuit

Publications (1)

Publication Number Publication Date
JPS5748809A true JPS5748809A (en) 1982-03-20

Family

ID=14881648

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55124289A Pending JPS5748809A (en) 1980-09-08 1980-09-08 Muting circuit

Country Status (1)

Country Link
JP (1) JPS5748809A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0817371A1 (en) * 1996-06-27 1998-01-07 Harris Corporation Silent start class D amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0817371A1 (en) * 1996-06-27 1998-01-07 Harris Corporation Silent start class D amplifier

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