JPS5753160A - Radio receiving device - Google Patents

Radio receiving device

Info

Publication number
JPS5753160A
JPS5753160A JP12798280A JP12798280A JPS5753160A JP S5753160 A JPS5753160 A JP S5753160A JP 12798280 A JP12798280 A JP 12798280A JP 12798280 A JP12798280 A JP 12798280A JP S5753160 A JPS5753160 A JP S5753160A
Authority
JP
Japan
Prior art keywords
muting
circuit
level
detuning
preamplifier
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
JP12798280A
Other languages
Japanese (ja)
Inventor
Masanori Ienaka
Yoshimi Iso
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 JP12798280A priority Critical patent/JPS5753160A/en
Priority to DE19813130341 priority patent/DE3130341A1/en
Priority to US06/290,564 priority patent/US4398060A/en
Priority to GB8126544A priority patent/GB2084825B/en
Publication of JPS5753160A publication Critical patent/JPS5753160A/en
Priority to GB08229214A priority patent/GB2111334B/en
Priority to HK462/86A priority patent/HK46286A/en
Priority to HK445/86A priority patent/HK44586A/en
Priority to MY585/86A priority patent/MY8600585A/en
Priority to MY582/86A priority patent/MY8600582A/en
Pending 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 erase pop noise surely, by discriminating a tuning or detuning detection signal by two different levels and by starting the operation of a muting circuit of the preceding stage earlier than that of a muting circuit of the succeeding stage and by releasing the operation of the muting circuit of the preceding stage later than that of the muting circuit of the succeeding stage. CONSTITUTION:For a detuning detection signal VM which becmes high-level for detuning and becomes low-level for tuning, a discrimination level VL1 of the first muting control circuit 11 is higher than a discrimination level VL2 of the second muting control circuit 12. When the muting operation is released due to the transition from detuning to tuning, the signal VM reaches the level VL1 first, and the muting operation in a preamplifier 7 is released before the muting circuit is released, and therefore, pop noise VPOP generated in the output of the preamplifier 7 is erased by a muting circuit 10. When the muting operation is started due to the transition from tuning to detuning, the signal VM reaches the level VL2 first, and the muting operation of the preamplifier 7 is started after the operation of the muting circuit starts, and therefore, pop noise VPOP generated in the output of the preamplifier 7 is earsed by the muting circuit.
JP12798280A 1980-09-17 1980-09-17 Radio receiving device Pending JPS5753160A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
JP12798280A JPS5753160A (en) 1980-09-17 1980-09-17 Radio receiving device
DE19813130341 DE3130341A1 (en) 1980-09-17 1981-07-31 NOISE CONTROL AND WITH THIS PROVIDED FM RADIO RECEIVER
US06/290,564 US4398060A (en) 1980-09-17 1981-08-06 Muting circuit for an FM radio receiver
GB8126544A GB2084825B (en) 1980-09-17 1981-09-02 A muting circuit and an fm radio receiver incorporating the muting circuit
GB08229214A GB2111334B (en) 1980-09-17 1982-10-13 Am fm radio receiver incorporating a muting circuit
HK462/86A HK46286A (en) 1980-09-17 1986-06-19 An fm radio receiver incorporating a muting circuit
HK445/86A HK44586A (en) 1980-09-17 1986-06-19 A muting circuit
MY585/86A MY8600585A (en) 1980-09-17 1986-12-30 An fm radio receiver incorporating a muting circuit
MY582/86A MY8600582A (en) 1980-09-17 1986-12-30 A muting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12798280A JPS5753160A (en) 1980-09-17 1980-09-17 Radio receiving device

Publications (1)

Publication Number Publication Date
JPS5753160A true JPS5753160A (en) 1982-03-30

Family

ID=14973506

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12798280A Pending JPS5753160A (en) 1980-09-17 1980-09-17 Radio receiving device

Country Status (1)

Country Link
JP (1) JPS5753160A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6133280A (en) * 1984-07-23 1986-02-17 株式会社田熊総合研究所 Steam washer
JPS63263364A (en) * 1987-04-21 1988-10-31 株式会社前川製作所 Continuous drying dehumidifier

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6133280A (en) * 1984-07-23 1986-02-17 株式会社田熊総合研究所 Steam washer
JPH0330434B2 (en) * 1984-07-23 1991-04-30
JPS63263364A (en) * 1987-04-21 1988-10-31 株式会社前川製作所 Continuous drying dehumidifier

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