JPS5449012A - Multichannel receiver - Google Patents

Multichannel receiver

Info

Publication number
JPS5449012A
JPS5449012A JP11631777A JP11631777A JPS5449012A JP S5449012 A JPS5449012 A JP S5449012A JP 11631777 A JP11631777 A JP 11631777A JP 11631777 A JP11631777 A JP 11631777A JP S5449012 A JPS5449012 A JP S5449012A
Authority
JP
Japan
Prior art keywords
changing
over time
detection circuit
circuit
oscillator
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
JP11631777A
Other languages
Japanese (ja)
Inventor
Noriaki Kato
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP11631777A priority Critical patent/JPS5449012A/en
Publication of JPS5449012A publication Critical patent/JPS5449012A/en
Pending 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 prevent the outputting of a click noise generated at a changing-over time in a receiver using a PLL frequency synthesizer, by detecting the transient state at the channel changing-over tme by a clock detection circuit which operates by the output of a phase comparator. CONSTITUTION:In the multichannel receiver which employs as a local oscillator the PLL frequency synthesizer composed of voltage control oscillator 8, reference frequency oscillator 11, programable divider 9, phase somparator 12, charge pump 13, LPF15, etc., the unlock state at the channel changing-over time is detected by the FF, logical gate circuit and lock detection circuit 14 provided to comparator 13, and the output of this detection circuit is applied to the switching method of muting circuit 6, so that the muting operation will stop the click noise at the changing-over time outputted from sound amplifier 7.
JP11631777A 1977-09-27 1977-09-27 Multichannel receiver Pending JPS5449012A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11631777A JPS5449012A (en) 1977-09-27 1977-09-27 Multichannel receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11631777A JPS5449012A (en) 1977-09-27 1977-09-27 Multichannel receiver

Publications (1)

Publication Number Publication Date
JPS5449012A true JPS5449012A (en) 1979-04-18

Family

ID=14683990

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11631777A Pending JPS5449012A (en) 1977-09-27 1977-09-27 Multichannel receiver

Country Status (1)

Country Link
JP (1) JPS5449012A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54115817U (en) * 1978-02-02 1979-08-14
US5134612A (en) * 1989-01-10 1992-07-28 Fujitsu Limited Digital communication terminal equipment
WO2002037896A1 (en) * 2000-11-04 2002-05-10 Mm Gear Co., Ltd. Portable multi-channel amplifier

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54115817U (en) * 1978-02-02 1979-08-14
US5134612A (en) * 1989-01-10 1992-07-28 Fujitsu Limited Digital communication terminal equipment
WO2002037896A1 (en) * 2000-11-04 2002-05-10 Mm Gear Co., Ltd. Portable multi-channel amplifier

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