FR2337461A1 - Dispositif de blocage automatique d'un canal a frequence acoustique - Google Patents

Dispositif de blocage automatique d'un canal a frequence acoustique

Info

Publication number
FR2337461A1
FR2337461A1 FR7639128A FR7639128A FR2337461A1 FR 2337461 A1 FR2337461 A1 FR 2337461A1 FR 7639128 A FR7639128 A FR 7639128A FR 7639128 A FR7639128 A FR 7639128A FR 2337461 A1 FR2337461 A1 FR 2337461A1
Authority
FR
France
Prior art keywords
locking device
frequency channel
automatic locking
acoustic frequency
acoustic
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
FR7639128A
Other languages
English (en)
Other versions
FR2337461B1 (fr
Inventor
Derek Stanley Juniper
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.)
Allard Way Holdings Ltd
Original Assignee
Elliott Brothers London 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 Elliott Brothers London Ltd filed Critical Elliott Brothers London Ltd
Publication of FR2337461A1 publication Critical patent/FR2337461A1/fr
Application granted granted Critical
Publication of FR2337461B1 publication Critical patent/FR2337461B1/fr
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
    • 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
    • H03G3/32—Automatic control in amplifiers having semiconductor devices the control being dependent upon ambient noise level or sound level
    • 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
    • H03G3/344—Muting responsive to the amount of noise (noise squelch)
FR7639128A 1975-12-29 1976-12-27 Dispositif de blocage automatique d'un canal a frequence acoustique Granted FR2337461A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB53043/75A GB1506510A (en) 1975-12-29 1975-12-29 Audio frequency automatic muting arrangements

Publications (2)

Publication Number Publication Date
FR2337461A1 true FR2337461A1 (fr) 1977-07-29
FR2337461B1 FR2337461B1 (fr) 1980-09-19

Family

ID=10466411

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7639128A Granted FR2337461A1 (fr) 1975-12-29 1976-12-27 Dispositif de blocage automatique d'un canal a frequence acoustique

Country Status (6)

Country Link
US (1) US4099127A (fr)
CA (1) CA1062168A (fr)
DE (1) DE2657436C2 (fr)
FR (1) FR2337461A1 (fr)
GB (1) GB1506510A (fr)
IT (1) IT1072234B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2404965A1 (fr) * 1977-09-29 1979-04-27 Gen Electric Circuit de silencieux pour un recepteur radiophonique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5166983A (en) * 1991-07-22 1992-11-24 Motorola, Inc. Mute circuit for audio amplifiers

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2802939A (en) * 1954-03-02 1957-08-13 Collins Radio Co Squelch system
US3011052A (en) * 1958-09-15 1961-11-28 Gen Dynamics Corp Transistor squelch circuit
US3568068A (en) * 1967-10-13 1971-03-02 Motorola Inc Squelch circuit for frequency modulation receiver
DE2135912A1 (de) * 1971-07-17 1973-03-22 Lestra Ag Vorrichtung zur abtastung von geschwindigkeitswerten bei kraftfahrzeugen
US3805166A (en) * 1972-10-20 1974-04-16 A Paredes Squelch circuit with time constant controlled by signal level
GB1427029A (en) * 1972-12-14 1976-03-03 Cunard Steam Ship Radio receiving apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2404965A1 (fr) * 1977-09-29 1979-04-27 Gen Electric Circuit de silencieux pour un recepteur radiophonique

Also Published As

Publication number Publication date
US4099127A (en) 1978-07-04
IT1072234B (it) 1985-04-10
DE2657436A1 (de) 1977-07-07
FR2337461B1 (fr) 1980-09-19
CA1062168A (fr) 1979-09-11
DE2657436C2 (de) 1986-07-17
GB1506510A (en) 1978-04-05

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Legal Events

Date Code Title Description
ST Notification of lapse