JPS57186211A - Muting circuit - Google Patents

Muting circuit

Info

Publication number
JPS57186211A
JPS57186211A JP56070726A JP7072681A JPS57186211A JP S57186211 A JPS57186211 A JP S57186211A JP 56070726 A JP56070726 A JP 56070726A JP 7072681 A JP7072681 A JP 7072681A JP S57186211 A JPS57186211 A JP S57186211A
Authority
JP
Japan
Prior art keywords
power supply
disconnection
circuit
stop mode
logical
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
JP56070726A
Other languages
Japanese (ja)
Inventor
Hiroshi Nakamura
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP56070726A priority Critical patent/JPS57186211A/en
Publication of JPS57186211A publication Critical patent/JPS57186211A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/22—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing distortions

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)

Abstract

PURPOSE:To erase various noises generated at the disconnection of power supply, by providing a muting transistor (TR) driven with a logical element and changing over the logical element to the stop mode at the disconnection of power supply of a tape recorder. CONSTITUTION:With a power switch 17 applied, when a stop mode switch 22 is closed at reproduction or recording, the input power supply to a logical circuit 3 drops, a TR8 immediately turns on and a terminal 9 is muted. In this case, when the time constant for a resistor 19 and a capacitor 21 is selected sufficiently smaller than the falling time constant of a power supply circuit 15, the input voltage to the logical circuit is dropped faster in comparison with the drop of output voltage of the power supply circuit 15 at recording and reproduction, the said logical circuit is selected to the stop mode, the muting TR8 is instantly conductive, allowing to completely mute noises generated at the disconnection of power supply.
JP56070726A 1981-05-13 1981-05-13 Muting circuit Pending JPS57186211A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56070726A JPS57186211A (en) 1981-05-13 1981-05-13 Muting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56070726A JPS57186211A (en) 1981-05-13 1981-05-13 Muting circuit

Publications (1)

Publication Number Publication Date
JPS57186211A true JPS57186211A (en) 1982-11-16

Family

ID=13439830

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56070726A Pending JPS57186211A (en) 1981-05-13 1981-05-13 Muting circuit

Country Status (1)

Country Link
JP (1) JPS57186211A (en)

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