IT1072234B - Sistema riduttore automatico di livello per audiofreqzenze - Google Patents

Sistema riduttore automatico di livello per audiofreqzenze

Info

Publication number
IT1072234B
IT1072234B IT69993/76A IT6999376A IT1072234B IT 1072234 B IT1072234 B IT 1072234B IT 69993/76 A IT69993/76 A IT 69993/76A IT 6999376 A IT6999376 A IT 6999376A IT 1072234 B IT1072234 B IT 1072234B
Authority
IT
Italy
Prior art keywords
audiofreqzenze
automatic level
reducer system
level reducer
automatic
Prior art date
Application number
IT69993/76A
Other languages
English (en)
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
Application granted granted Critical
Publication of IT1072234B publication Critical patent/IT1072234B/it

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
    • 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
    • H03G3/32—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
    • 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)
IT69993/76A 1975-12-29 1976-12-16 Sistema riduttore automatico di livello per audiofreqzenze IT1072234B (it)

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 (1)

Publication Number Publication Date
IT1072234B true IT1072234B (it) 1985-04-10

Family

ID=10466411

Family Applications (1)

Application Number Title Priority Date Filing Date
IT69993/76A IT1072234B (it) 1975-12-29 1976-12-16 Sistema riduttore automatico di livello per audiofreqzenze

Country Status (6)

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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4132953A (en) * 1977-09-29 1979-01-02 General Electric Company Squelch circuit for a radio receiver
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

Also Published As

Publication number Publication date
DE2657436C2 (de) 1986-07-17
GB1506510A (en) 1978-04-05
FR2337461B1 (it) 1980-09-19
DE2657436A1 (de) 1977-07-07
US4099127A (en) 1978-07-04
CA1062168A (en) 1979-09-11
FR2337461A1 (fr) 1977-07-29

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