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JPS566542A - Muting system for fm radio receiver - Google Patents

Muting system for fm radio receiver

Info

Publication number
JPS566542A
JPS566542A JP8229779A JP8229779A JPS566542A JP S566542 A JPS566542 A JP S566542A JP 8229779 A JP8229779 A JP 8229779A JP 8229779 A JP8229779 A JP 8229779A JP S566542 A JPS566542 A JP S566542A
Authority
JP
Japan
Prior art keywords
circuit
muting
time
signal
level
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
JP8229779A
Other languages
Japanese (ja)
Other versions
JPS5945302B2 (en
Inventor
Hideo Kawabata
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP8229779A priority Critical patent/JPS5945302B2/en
Publication of JPS566542A publication Critical patent/JPS566542A/en
Publication of JPS5945302B2 publication Critical patent/JPS5945302B2/en
Expired legal-status Critical Current

Links

Classifications

    • 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

  • Noise Elimination (AREA)

Abstract

PURPOSE:To realize the muting system for the mobile FM radio receiver to secure the easy-to-hear voice, by muting the low-frequency signal hard at the detuning time and soft at the time of the weak field intensity respectively. CONSTITUTION:The IF level signal of IF amplifier circuit 2 obtained through level detecting circuit 5 and band pass filter 6 plus the detection output level signal of FM detector 3 obtained through level comparator 7 are applied to AND circuit 8. And circuit 8 applies the output signal shown in (a) to OR circuit 9 at the tuning operation time. At the tuning operation time, circuit 9 gives the control to attenuator 4 by the signal shown in (a) to carry out the hard muting. And in case the field intensity is reduced at the tuning time, the control is given to attenuator 4 by the signal shown in (b) which is supplied from circuit 5 to carry out the soft muting.
JP8229779A 1979-06-27 1979-06-27 Muting system for FM radio receiver Expired JPS5945302B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8229779A JPS5945302B2 (en) 1979-06-27 1979-06-27 Muting system for FM radio receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8229779A JPS5945302B2 (en) 1979-06-27 1979-06-27 Muting system for FM radio receiver

Publications (2)

Publication Number Publication Date
JPS566542A true JPS566542A (en) 1981-01-23
JPS5945302B2 JPS5945302B2 (en) 1984-11-05

Family

ID=13770605

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8229779A Expired JPS5945302B2 (en) 1979-06-27 1979-06-27 Muting system for FM radio receiver

Country Status (1)

Country Link
JP (1) JPS5945302B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4525868A (en) * 1982-03-23 1985-06-25 Nippon Electric Co., Ltd. Interference wave detection circuit for use in radio receiver
EP0429021A2 (en) * 1989-11-17 1991-05-29 Sanyo Electric Co., Ltd. A receiver capable of quickly suppressing defective effect of multipath reflection interference
US5918205A (en) * 1996-01-30 1999-06-29 Lsi Logic Corporation Audio decoder employing error concealment technique

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4525868A (en) * 1982-03-23 1985-06-25 Nippon Electric Co., Ltd. Interference wave detection circuit for use in radio receiver
EP0429021A2 (en) * 1989-11-17 1991-05-29 Sanyo Electric Co., Ltd. A receiver capable of quickly suppressing defective effect of multipath reflection interference
US5918205A (en) * 1996-01-30 1999-06-29 Lsi Logic Corporation Audio decoder employing error concealment technique

Also Published As

Publication number Publication date
JPS5945302B2 (en) 1984-11-05

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