AU500961B2 - Squelch circuit - Google Patents

Squelch circuit

Info

Publication number
AU500961B2
AU500961B2 AU15412/76A AU1541276A AU500961B2 AU 500961 B2 AU500961 B2 AU 500961B2 AU 15412/76 A AU15412/76 A AU 15412/76A AU 1541276 A AU1541276 A AU 1541276A AU 500961 B2 AU500961 B2 AU 500961B2
Authority
AU
Australia
Prior art keywords
squelch circuit
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.)
Expired
Application number
AU15412/76A
Other languages
English (en)
Other versions
AU1541276A (en
Inventor
Dr. Altstatt J. E. Bush Ja Lance
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.)
California Microwave Inc
Original Assignee
California Microwave Inc
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 California Microwave Inc filed Critical California Microwave Inc
Publication of AU1541276A publication Critical patent/AU1541276A/en
Application granted granted Critical
Publication of AU500961B2 publication Critical patent/AU500961B2/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
    • H03G3/344—Muting responsive to the amount of noise (noise squelch)
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/001—Details of arrangements applicable to more than one type of frequency demodulator
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
AU15412/76A 1975-06-30 1976-06-29 Squelch circuit Expired AU500961B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
USUS591533 1975-06-30
US05/591,533 US3979679A (en) 1975-06-30 1975-06-30 FM demodulator having squelch circuit using bucket brigade delay line

Publications (2)

Publication Number Publication Date
AU1541276A AU1541276A (en) 1978-01-05
AU500961B2 true AU500961B2 (en) 1979-06-07

Family

ID=24366853

Family Applications (1)

Application Number Title Priority Date Filing Date
AU15412/76A Expired AU500961B2 (en) 1975-06-30 1976-06-29 Squelch circuit

Country Status (10)

Country Link
US (1) US3979679A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS527614A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
AU (1) AU500961B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
BR (1) BR7604257A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CA (1) CA1060101A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2629404C2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2316790A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1539568A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IT (1) IT1063780B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL7607087A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6041493B2 (ja) * 1977-03-16 1985-09-17 ソニー株式会社 受信機
US4153878A (en) * 1977-05-02 1979-05-08 Motorola, Inc. Sectored antenna communications receiver with squelch circuit
US4220926A (en) * 1977-08-26 1980-09-02 Plessey Handel Und Investments Ag. Noise detector employing plural delay circuits
JPS5489214U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1977-12-06 1979-06-23
JPS54140468U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1978-03-23 1979-09-29
EP0018702A1 (en) * 1979-04-30 1980-11-12 Motorola, Inc. Improvements in and relating to noise blanking circuitry in a radio receiver
US4416024A (en) * 1979-12-17 1983-11-15 Sanyo Electric Co., Inc. Distortion reducing circuit in FM receiver
DE3008076C2 (de) * 1980-03-03 1982-05-06 Siemens AG, 1000 Berlin und 8000 München Einrichtung zur Empfängerabschaltung bei kleinem Signal-Geräusch-Abstand für ein digital moduliertes Funksystem mit Frequenzmodulation
US4359780A (en) * 1980-08-06 1982-11-16 Motorola, Inc. (Corporate Offices) High speed squelch circuit
JPS5761327A (en) * 1980-09-30 1982-04-13 Sony Corp Periodicity pulse extraction circuit
US4504966A (en) * 1983-05-31 1985-03-12 Harris Corporation Stereo inhibitor for AM stereo receiver
FR2547138B1 (fr) * 1983-06-01 1985-07-12 Trt Telecom Radio Electr Dispositif de silencieux pour recepteur radio am/fm
DE3326062A1 (de) * 1983-07-20 1985-01-31 Gerhard Prof. Dr.-Ing. 8012 Ottobrunn Flachenecker Detektor zur anzeige von frequenzstoerhubspitzen
US4661996A (en) * 1984-04-25 1987-04-28 Scandurra Aldo M Method and apparatus for indicating radio frequency carrier loss in remotely controlled vehicles
FR2618625B1 (fr) * 1987-07-24 1989-11-24 Labo Electronique Physique Dispositif d'amelioration du decodage de signaux numeriques lors de transmissions en modulation de frequence
US4907249A (en) * 1988-07-20 1990-03-06 Nebel Paul R Automatic off/on circuit for monitoring data receiving and storing devices
JPH0750861B2 (ja) * 1988-08-10 1995-05-31 パイオニア株式会社 Ｆｍ受信機のパルス性ノイズ抑圧装置
JP2785401B2 (ja) * 1989-12-19 1998-08-13 ソニー株式会社 Ｆｍ伝送装置
JPH03259622A (ja) * 1990-03-09 1991-11-19 Pioneer Electron Corp ノイズ低減回路
US5490166A (en) * 1990-10-01 1996-02-06 Motorola, Inc. Data muting method and apparatus using delay circuits for communication systems
US5450622A (en) * 1991-07-23 1995-09-12 Ericsson Inc. Method and apparatus for providing a very fast acting noise squelch control system for an RF radio receiver
US5418821A (en) * 1991-10-15 1995-05-23 National Semiconductor Corporation Method and apparatus for sample-data receiver squelch
DE4226346A1 (de) * 1992-08-08 1994-02-10 Philips Patentverwaltung Schaltungsanordnung zur Bestimmung der Feldstärke von FM-Sendern
DK0671818T3 (da) * 1994-03-07 2006-04-03 Phonak Comm Ag Miniaturemodtager til modtagelse af et höjfrekvent frekvens- eller fasemoduleret signal
US5583891A (en) * 1994-10-31 1996-12-10 Motorola, Inc. Noise attenuation circuit for amplitude modulated radio and method therefor
US5649321A (en) * 1995-05-05 1997-07-15 Motorola, Inc. Method and apparatus for determining audio band energy of a squelch circuit input signal
FR2744305B1 (fr) 1996-01-25 1998-03-27 Groupe President Electronics Circuit de blocage a reglage automatique pour recepteur radio
DE19722385C2 (de) * 1997-05-28 2002-11-07 Grundig Ag Verfahren zur Erkennung von Multipathstörungen beim FM-Rundfunkempfang und Schaltungsanordnung zur Durchführung des Verfahrens
JP3473511B2 (ja) 1999-07-22 2003-12-08 三菱電機株式会社 マルチパスノイズ除去装置、オーディオ出力装置およびｆｍ受信機
EP1843467B1 (en) * 2006-04-07 2010-05-26 Rohde & Schwarz GmbH & Co. KG Method and apparatus for squelch gating a receiving signal
EP2800279B1 (en) * 2013-05-01 2018-04-25 Analog Devices Global Unlimited Company Demodulation of attenuated FM modulated audio signals
DE112016003942T5 (de) * 2015-08-31 2018-05-24 Asahi Kasei Microdevices Corporation Demodulator

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2756328A (en) * 1951-06-27 1956-07-24 Hartford Nat Bank & Trust Co Audio-noise responsive squelch circuit
US3049710A (en) * 1958-01-02 1962-08-14 Gen Electric Continuous tone-controlled squelch system
DE1616576B1 (de) * 1962-03-29 1969-10-16 Telefunken Patent Funkeinrichtung mit mindestens zwei Sendern und mindestens einem insbesondere beweglichen Empfänger
US3543165A (en) * 1967-10-02 1970-11-24 Motorola Inc Transistor switch circuit responsive to change in direct current voltage
US3568068A (en) * 1967-10-13 1971-03-02 Motorola Inc Squelch circuit for frequency modulation receiver
FR1585427A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1968-07-16 1970-01-23
US3588705A (en) * 1969-11-12 1971-06-28 Nasa Frequency-modulation demodulator threshold extension device
US3851253A (en) * 1973-05-25 1974-11-26 Motorola Inc Automatically adjustable fm receiver squelch

Also Published As

Publication number Publication date
DE2629404A1 (de) 1977-01-27
GB1539568A (en) 1979-01-31
IT1063780B (it) 1985-02-11
US3979679A (en) 1976-09-07
DE2629404C2 (de) 1982-06-09
JPS5651701B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1981-12-07
AU1541276A (en) 1978-01-05
BR7604257A (pt) 1977-04-05
JPS527614A (en) 1977-01-20
NL7607087A (nl) 1977-01-03
FR2316790A1 (fr) 1977-01-28
CA1060101A (en) 1979-08-07

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