JPS5758418A - Muting circuit - Google Patents

Muting circuit

Info

Publication number
JPS5758418A
JPS5758418A JP13291180A JP13291180A JPS5758418A JP S5758418 A JPS5758418 A JP S5758418A JP 13291180 A JP13291180 A JP 13291180A JP 13291180 A JP13291180 A JP 13291180A JP S5758418 A JPS5758418 A JP S5758418A
Authority
JP
Japan
Prior art keywords
muting
output
stereophonic
filter
attenuation
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.)
Granted
Application number
JP13291180A
Other languages
Japanese (ja)
Other versions
JPS634370B2 (en
Inventor
Yoshimi Iso
Masanori Ienaka
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 JP13291180A priority Critical patent/JPS5758418A/en
Publication of JPS5758418A publication Critical patent/JPS5758418A/en
Publication of JPS634370B2 publication Critical patent/JPS634370B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H40/00—Arrangements specially adapted for receiving broadcast information
    • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
    • H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
    • H04H40/36—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving
    • H04H40/45—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving for FM stereophonic broadcast systems receiving
    • H04H40/72—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving for FM stereophonic broadcast systems receiving for noise suppression
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
    • H03G3/348—Muting in response to a mechanical action or to power supply variations, e.g. during tuning; Click removal circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Stereo-Broadcasting Methods (AREA)

Abstract

PURPOSE:To reduce the pop tone appeared at an output terminal, by locating a muting element producing pop tone before a leakage filter, in a muting circuit of an FM stereophonic radio receiver. CONSTITUTION:A composite signal being an output of a detector inputted to a stereophonic demodulator 7 of an FM stereophonic radio receiver is demodulated into left and right signals and inputted to an amplifier 8, and the output is applied to a filter 9 via resistors R18, R19 constituting the input impedance of a leakage filter. Taking the values of the resistor R18, R19, equal as a half of a resistor R15, pop tone produced at a muting transistor 17 controlled with a muting control circuit 102 is 2/3 at an output terminal 20 to be almost halved. The attenuation of a signal is -49.5dB and the attenuation when muting is operated is at -47dB, which gives deterioration of only 2.5dB, indicating almost no effect.
JP13291180A 1980-09-26 1980-09-26 Muting circuit Granted JPS5758418A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13291180A JPS5758418A (en) 1980-09-26 1980-09-26 Muting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13291180A JPS5758418A (en) 1980-09-26 1980-09-26 Muting circuit

Publications (2)

Publication Number Publication Date
JPS5758418A true JPS5758418A (en) 1982-04-08
JPS634370B2 JPS634370B2 (en) 1988-01-28

Family

ID=15092402

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13291180A Granted JPS5758418A (en) 1980-09-26 1980-09-26 Muting circuit

Country Status (1)

Country Link
JP (1) JPS5758418A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5440501A (en) * 1977-09-06 1979-03-30 Mitsubishi Electric Corp Fm stereo receiver
JPS54127603A (en) * 1978-03-28 1979-10-03 Pioneer Electronic Corp Pulse noise eliminator for fm receiver

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5440501A (en) * 1977-09-06 1979-03-30 Mitsubishi Electric Corp Fm stereo receiver
JPS54127603A (en) * 1978-03-28 1979-10-03 Pioneer Electronic Corp Pulse noise eliminator for fm receiver

Also Published As

Publication number Publication date
JPS634370B2 (en) 1988-01-28

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