CA1024603A - Noise-squelching circuit using a phase-locked loop - Google Patents

Noise-squelching circuit using a phase-locked loop

Info

Publication number
CA1024603A
CA1024603A CA210,273A CA210273A CA1024603A CA 1024603 A CA1024603 A CA 1024603A CA 210273 A CA210273 A CA 210273A CA 1024603 A CA1024603 A CA 1024603A
Authority
CA
Canada
Prior art keywords
noise
phase
locked loop
squelching
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
CA210,273A
Other languages
English (en)
French (fr)
Other versions
CA210273S (en
Inventor
Masakatsu Toyoshima
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Application granted granted Critical
Publication of CA1024603A publication Critical patent/CA1024603A/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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D1/00—Demodulation of amplitude-modulated oscillations
    • H03D1/22—Homodyne or synchrodyne circuits
    • H03D1/2281—Homodyne or synchrodyne circuits using a phase locked loop

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Noise Elimination (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Superheterodyne Receivers (AREA)
CA210,273A 1973-09-28 1974-09-27 Noise-squelching circuit using a phase-locked loop Expired CA1024603A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10911973A JPS5722252B2 (nl) 1973-09-28 1973-09-28

Publications (1)

Publication Number Publication Date
CA1024603A true CA1024603A (en) 1978-01-17

Family

ID=14502023

Family Applications (1)

Application Number Title Priority Date Filing Date
CA210,273A Expired CA1024603A (en) 1973-09-28 1974-09-27 Noise-squelching circuit using a phase-locked loop

Country Status (8)

Country Link
US (1) US3939425A (nl)
JP (1) JPS5722252B2 (nl)
CA (1) CA1024603A (nl)
DE (1) DE2446271C2 (nl)
FR (1) FR2247029B1 (nl)
GB (1) GB1480774A (nl)
IT (1) IT1022418B (nl)
NL (1) NL188777C (nl)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2546985C2 (de) * 1975-10-21 1987-03-12 Robert Bosch Gmbh, 7000 Stuttgart Mehrkanal-Sprechfunkgerät mit einem PLL-(phase locked loop-)Oszillatorkreis
JPS52119108A (en) * 1976-03-31 1977-10-06 Sansui Electric Co Muutuning device
JPS5337344U (nl) * 1976-09-03 1978-04-01
US4093824A (en) * 1976-11-15 1978-06-06 Gte Sylvania Incorporated Receiver having a phase-locked loop
US4130731A (en) * 1976-12-29 1978-12-19 International Mobile Machines Incorporated Portable telephone system
JPS6041493B2 (ja) * 1977-03-16 1985-09-17 ソニー株式会社 受信機
JPS53123650A (en) * 1977-04-04 1978-10-28 Sony Corp Demodulator circuit
US4355417A (en) * 1977-09-22 1982-10-19 Kozak Jr Joseph H Squelch control circuit for amplitude modulated RF receivers
JPS54115817U (nl) * 1978-02-02 1979-08-14
US4228320A (en) * 1978-11-02 1980-10-14 Bell Telephone Laboratories, Incorporated Noise detector for frequency modulation systems
JPS583032Y2 (ja) * 1978-11-29 1983-01-19 日本乾燥機株式会社 横型連続流動乾燥装置
US4253118A (en) * 1979-07-02 1981-02-24 Zenith Radio Corporation Synchronous detection system
NL184594C (nl) * 1979-09-04 1989-09-01 Philips Nv Radio-ontvanger voorzien van een frequentie gesleutelde lus met audiofrequente terugkoppeling, en een stomschakeling.
US4342120A (en) * 1980-11-10 1982-07-27 The Bendix Corporation Squelch system for use in a multiple carrier AM communications systems receiver
JPS583647U (ja) * 1981-06-30 1983-01-11 ソニー株式会社 Ａｍ受信機
US4507661A (en) * 1982-04-26 1985-03-26 The United States Of America As Represented By The Secretary Of The Navy Interfering noise pulse eliminator and its use in a dicke type radiometer circuit
EP0148879B1 (en) * 1983-06-27 1989-09-27 The Commonwealth Of Australia Squelch circuit
JPS60139029A (ja) * 1983-12-27 1985-07-23 Pioneer Electronic Corp ランダムノイズ検出方法
US5199049A (en) * 1990-04-27 1993-03-30 At&T Bell Laboratories Circuit and method of digital carrier detection for burst mode communication systems
US6212245B1 (en) * 1995-07-13 2001-04-03 Canon Kabushiki Kaisha Communication apparatus
CN109541697B (zh) * 2019-01-28 2024-06-11 上海太易检测技术有限公司 一种带有噪声抑制结构的金属检测系统及方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3100871A (en) * 1961-01-03 1963-08-13 Motorola Inc Single sideband receiver having squelch and phase-locked detection means
US3358234A (en) * 1965-04-02 1967-12-12 Collins Radio Co Ssb system which overcomes problems of squelch, impulse interference and agc as commonly encountered
US3397360A (en) * 1966-02-18 1968-08-13 Nippon Electric Co Reception system using carrier detection for angularly modulated signals
US3541449A (en) * 1967-03-30 1970-11-17 Aerojet General Co Fm channel evaluator with aided tracking and null rejection
JPS504611B2 (nl) * 1971-11-12 1975-02-21
JPS5319681Y2 (nl) * 1973-05-14 1978-05-25

Also Published As

Publication number Publication date
NL188777C (nl) 1992-09-16
NL7412556A (nl) 1975-04-02
GB1480774A (en) 1977-07-27
DE2446271C2 (de) 1984-11-15
DE2446271A1 (de) 1975-04-03
FR2247029A1 (nl) 1975-05-02
FR2247029B1 (nl) 1981-01-30
JPS5722252B2 (nl) 1982-05-12
US3939425A (en) 1976-02-17
IT1022418B (it) 1978-03-20
NL188777B (nl) 1992-04-16
JPS5061109A (nl) 1975-05-26

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