CA1002882A - Audio amplifier systems - Google Patents

Audio amplifier systems

Info

Publication number
CA1002882A
CA1002882A CA196,226A CA196226A CA1002882A CA 1002882 A CA1002882 A CA 1002882A CA 196226 A CA196226 A CA 196226A CA 1002882 A CA1002882 A CA 1002882A
Authority
CA
Canada
Prior art keywords
audio amplifier
amplifier systems
systems
audio
amplifier
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
CA196,226A
Inventor
Robert T. Munson
Philip Hodgson
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.)
Television Research Ltd
Original Assignee
Television Research 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 Television Research Ltd filed Critical Television Research Ltd
Application granted granted Critical
Publication of CA1002882A publication Critical patent/CA1002882A/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 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
CA196,226A 1973-03-28 1974-03-28 Audio amplifier systems Expired CA1002882A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1495173 1973-03-28

Publications (1)

Publication Number Publication Date
CA1002882A true CA1002882A (en) 1977-01-04

Family

ID=10050425

Family Applications (1)

Application Number Title Priority Date Filing Date
CA196,226A Expired CA1002882A (en) 1973-03-28 1974-03-28 Audio amplifier systems

Country Status (4)

Country Link
AT (1) AT332466B (en)
CA (1) CA1002882A (en)
DE (1) DE2414143B2 (en)
FR (1) FR2231153B1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2353899A1 (en) * 1976-06-02 1977-12-30 Fricke Jobst Sound information reproduction system - has two compressor units connected in series between radio receiver and power amplifier
DE2752657A1 (en) * 1977-11-25 1979-06-07 Blaupunkt Werke Gmbh Automatic volume control for car radios - selects narrow frequency band from useful signal and uses its level to control switch connecting microphone to store
DE2816858A1 (en) * 1978-04-18 1979-10-31 Wsz Elektronik Gmbh Automatic volume control of background music or noise - has peak rectifier and integrator between sensor preamplifier and volume controller
DE2835384C2 (en) * 1978-08-12 1985-01-24 Grundig E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig & Co KG, 8510 Fürth Arrangement for the automatic adjustment of the volume of an LF signal source
DE2849961A1 (en) * 1978-11-17 1980-05-22 Siemens Ag ELECTRIC ACOUSTIC SIGNALER WITH AUTOMATIC VOLUME ADJUSTMENT TO THE AMBIENT NOISE LEVEL
DE4012175C2 (en) * 1990-04-14 1995-04-13 Telefunken Microelectron Speakerphone

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR965365A (en) * 1950-09-11
US2668874A (en) * 1950-01-10 1954-02-09 Bell Telephone Labor Inc Automatic volume control
US3135836A (en) * 1961-08-07 1964-06-02 Wurlitzer Co Background noise compensated recording player
US3444323A (en) * 1964-11-26 1969-05-13 Tdk Electronics Co Ltd Automatic sound volume controlling system
US3410958A (en) * 1965-03-25 1968-11-12 Executone Inf Sys Inc Noise controlled sound reproducing system

Also Published As

Publication number Publication date
FR2231153A1 (en) 1974-12-20
DE2414143B2 (en) 1981-01-15
FR2231153B1 (en) 1978-01-20
AT332466B (en) 1976-09-27
ATA250874A (en) 1976-01-15
DE2414143A1 (en) 1974-10-03

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