CA946479A - Carrier and tone squelch circuit with elimination of noise at end of transmission - Google Patents

Carrier and tone squelch circuit with elimination of noise at end of transmission

Info

Publication number
CA946479A
CA946479A CA113,780A CA113780A CA946479A CA 946479 A CA946479 A CA 946479A CA 113780 A CA113780 A CA 113780A CA 946479 A CA946479 A CA 946479A
Authority
CA
Canada
Prior art keywords
elimination
noise
carrier
transmission
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
CA113,780A
Other languages
English (en)
Other versions
CA113780S (en
Inventor
George H. Ryan
Ross W. Randolph
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.)
Motorola Solutions Inc
Original Assignee
Motorola 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 Motorola Inc filed Critical Motorola Inc
Application granted granted Critical
Publication of CA946479A publication Critical patent/CA946479A/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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/005—Control by a pilot signal
    • 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)
CA113,780A 1970-08-19 1971-05-25 Carrier and tone squelch circuit with elimination of noise at end of transmission Expired CA946479A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US6508970A 1970-08-19 1970-08-19

Publications (1)

Publication Number Publication Date
CA946479A true CA946479A (en) 1974-04-30

Family

ID=22060267

Family Applications (1)

Application Number Title Priority Date Filing Date
CA113,780A Expired CA946479A (en) 1970-08-19 1971-05-25 Carrier and tone squelch circuit with elimination of noise at end of transmission

Country Status (5)

Country Link
US (1) US3654555A (da)
CA (1) CA946479A (da)
DE (1) DE2117425C3 (da)
DK (1) DK143928C (da)
SE (1) SE375209B (da)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3711777A (en) * 1971-09-16 1973-01-16 Ncr Latching and control circuit for carrier detection
US3750032A (en) * 1972-02-24 1973-07-31 Motorola Inc Priority channel scanning system with dual response time control
US3810023A (en) * 1972-07-21 1974-05-07 Rca Corp Automatic squelch tail eliminator for tone coded squelch systems
US4020421A (en) * 1976-03-23 1977-04-26 General Electric Company Muting circuit
US4041390A (en) * 1976-03-25 1977-08-09 Motorola, Inc. Transceiver squelch circuit
US4829588A (en) * 1981-08-25 1989-05-09 Harris Corporation Automatic retransmission with pilot tone
US4392248A (en) * 1981-10-05 1983-07-05 Time And Frequency Technology, Inc. Attention signal receiver for emergency broadcast systems
US4748688A (en) * 1986-04-28 1988-05-31 Emhart Industries, Inc. Electromagnetic wave receiver
US5060296A (en) * 1989-02-28 1991-10-22 Motorola, Inc. Communication system with squelch control
US5220565A (en) * 1991-05-30 1993-06-15 Motorola, Inc. Selective transmission of encoded voice information representing silence
US5881101A (en) * 1994-09-01 1999-03-09 Harris Corporation Burst serial tone waveform signaling method and device for squelch/wake-up control of an HF transceiver
US7951449B2 (en) * 2002-06-27 2011-05-31 Wenguang Ma Polyester core materials and structural sandwich composites thereof

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3092772A (en) * 1960-06-07 1963-06-04 Gen Electric Control for noise squelch circuit
BE638382A (da) * 1962-10-16
US3397401A (en) * 1966-05-27 1968-08-13 Hughes Aircraft Co Voice operated communication system
US3496467A (en) * 1967-10-13 1970-02-17 Motorola Inc Automatic tone coded squelch circuit for radio communication system
US3584304A (en) * 1969-06-11 1971-06-08 Motorola Inc Squelch tail eliminator for dual squelch

Also Published As

Publication number Publication date
SE375209B (da) 1975-04-07
DE2117425C3 (de) 1981-01-15
DE2117425A1 (de) 1972-04-20
DK143928B (da) 1981-10-26
US3654555A (en) 1972-04-04
DK143928C (da) 1982-04-19
DE2117425B2 (de) 1980-05-14

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