JPS5714209A - Squelch circuit - Google Patents

Squelch circuit

Info

Publication number
JPS5714209A
JPS5714209A JP8893080A JP8893080A JPS5714209A JP S5714209 A JPS5714209 A JP S5714209A JP 8893080 A JP8893080 A JP 8893080A JP 8893080 A JP8893080 A JP 8893080A JP S5714209 A JPS5714209 A JP S5714209A
Authority
JP
Japan
Prior art keywords
squelch
amplifier
frequency
detector
squelch circuit
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
JP8893080A
Other languages
Japanese (ja)
Inventor
Kazuyoshi Imazeki
Seiji Koyama
Hisashi Wani
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.)
GEN RES ELECTRONICS Inc
GENERAL RES OBU EREKUTORONITSUKUSU KK
Original Assignee
GEN RES ELECTRONICS Inc
GENERAL RES OBU EREKUTORONITSUKUSU KK
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 GEN RES ELECTRONICS Inc, GENERAL RES OBU EREKUTORONITSUKUSU KK filed Critical GEN RES ELECTRONICS Inc
Priority to JP8893080A priority Critical patent/JPS5714209A/en
Publication of JPS5714209A publication Critical patent/JPS5714209A/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
    • H03G3/344—Muting responsive to the amount of noise (noise squelch)

Landscapes

  • Control Of Amplification And Gain Control (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE:To obtain a wide squelch range by branching a squelch circuit from an intermediate-frequency stage and by providing the squelch circuit with an AGC amplifier controlled with a squelch level control signal. CONSTITUTION:A squelch circuit 20 receives some branch part of an output from an intermediate-frequency filter 10 an intermediate-frequency amplifier 12, and it is inputted to a noise detector 32 by way of an AGC amplifier 22, an intermediate- frequency amplifier and detector 24, a high-pass filter 26, an electronic volume control 28, and a noise amplifer 30 to detect a noise component, thereby controlling an analog switch 16 provided between the detector of a receiver and an audio amplifier 18. Then, a manually controlled DC-level squelch control voltage input to a terminal 34 is supplied to the AGC amplifier 22 and electronic volume control 28 for control.
JP8893080A 1980-06-30 1980-06-30 Squelch circuit Pending JPS5714209A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8893080A JPS5714209A (en) 1980-06-30 1980-06-30 Squelch circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8893080A JPS5714209A (en) 1980-06-30 1980-06-30 Squelch circuit

Publications (1)

Publication Number Publication Date
JPS5714209A true JPS5714209A (en) 1982-01-25

Family

ID=13956610

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8893080A Pending JPS5714209A (en) 1980-06-30 1980-06-30 Squelch circuit

Country Status (1)

Country Link
JP (1) JPS5714209A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0372006A1 (en) * 1987-10-30 1990-06-13 FERNANDEZ, Emilio A Improved paging device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0372006A1 (en) * 1987-10-30 1990-06-13 FERNANDEZ, Emilio A Improved paging device

Similar Documents

Publication Publication Date Title
JPS5564412A (en) Frequency characteristic regulator
JPS5714209A (en) Squelch circuit
JPS57148413A (en) Sound absorbing device
GB1094357A (en) Improvements in or relating to speech filters
GB945861A (en) Improvements in or relating to frequency modulation receivers
JPS5733836A (en) Automatic noise reducing circuit
JPS5642411A (en) Audio intermediate frequency circuit
JPS56158511A (en) Automatic gain control circuit
JPS572110A (en) Automatic gain control circuit
JPS5723332A (en) Muting device
JPS57160229A (en) Intermediate frequency amplifier with narrow band squelch detecting circuit
JPS5443448A (en) Compressor
JPS5754435A (en) Automatic squelch controlling system
JPS54152414A (en) Squelch system of fm mobile radio equipment
JPS56166481A (en) Deciding method of earthquake
JPS57115010A (en) Automatic sound volume adjuster
JPS57211847A (en) Receiving device
JPS57188163A (en) Signal discriminator
JPS56137720A (en) Receiving circuit for amplitude-modulated wave
JPS5765914A (en) Noise reducing device
JPS5748812A (en) Amplifier
JPS5453945A (en) Automatic gain control circuit
JPS56103511A (en) Monolithic semiconductor integrated circuit
JPS5784690A (en) Automatic gain control circuit in video signal transmission system
JPS5769982A (en) Audio reception circuit for television receiver