JPS57202136A - Muting circuit - Google Patents

Muting circuit

Info

Publication number
JPS57202136A
JPS57202136A JP8694381A JP8694381A JPS57202136A JP S57202136 A JPS57202136 A JP S57202136A JP 8694381 A JP8694381 A JP 8694381A JP 8694381 A JP8694381 A JP 8694381A JP S57202136 A JPS57202136 A JP S57202136A
Authority
JP
Japan
Prior art keywords
switch
terminal
circuit
muting
sensitivity
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
JP8694381A
Other languages
Japanese (ja)
Other versions
JPH0151217B2 (en
Inventor
Akinori Maeda
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 JP8694381A priority Critical patent/JPS57202136A/en
Publication of JPS57202136A publication Critical patent/JPS57202136A/en
Publication of JPH0151217B2 publication Critical patent/JPH0151217B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • 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

Abstract

PURPOSE:To receive a signal with a lower reception level, by switching a characteristic of a frequency selecting circuit to a narrow band for reduction in intermodulation interference and changing over a lower muting sensitivity to lower one at the same time. CONSTITUTION:When a selectivity changeover switch 14 is connected to a terminal (b) side, a frequency selecting circuit 2 has a broad band characteristic, a receiver acts like high sensitivity reception and an output of a level detector 11 having higher detection level is applied to a muting circuit through the terminal (b) side of a muting sensitivity changeover switch 20 functioning cooperatively with a switch. When the circuit 2 is operated at a narrow band by switching the switch 14 to the terminal (a) to reduce intermodulation interference, since the reception sensitivity is also reduced, the switch 20 is also changed over to the terminal (a) side in interlocking with the switch 14, and an output of the level detector 11 with lower detection level is applied to the muting circuit.
JP8694381A 1981-06-08 1981-06-08 Muting circuit Granted JPS57202136A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8694381A JPS57202136A (en) 1981-06-08 1981-06-08 Muting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8694381A JPS57202136A (en) 1981-06-08 1981-06-08 Muting circuit

Publications (2)

Publication Number Publication Date
JPS57202136A true JPS57202136A (en) 1982-12-10
JPH0151217B2 JPH0151217B2 (en) 1989-11-02

Family

ID=13900947

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8694381A Granted JPS57202136A (en) 1981-06-08 1981-06-08 Muting circuit

Country Status (1)

Country Link
JP (1) JPS57202136A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100378121B1 (en) * 1999-12-29 2003-03-29 삼성전자주식회사 Intermodulation control device and method in a mobile communication system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100378121B1 (en) * 1999-12-29 2003-03-29 삼성전자주식회사 Intermodulation control device and method in a mobile communication system

Also Published As

Publication number Publication date
JPH0151217B2 (en) 1989-11-02

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