CA1002882A - Audio amplifier systems - Google Patents
Audio amplifier systemsInfo
- 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
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
- H03G3/32—Automatic control in amplifiers having semiconductor devices the control being dependent upon ambient noise level or sound level
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)
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)
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 |
-
1974
- 1974-03-23 DE DE19742414143 patent/DE2414143B2/en not_active Ceased
- 1974-03-26 AT AT250874A patent/AT332466B/en not_active IP Right Cessation
- 1974-03-28 FR FR7411863A patent/FR2231153B1/fr not_active Expired
- 1974-03-28 CA CA196,226A patent/CA1002882A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE2414143A1 (en) | 1974-10-03 |
AT332466B (en) | 1976-09-27 |
FR2231153A1 (en) | 1974-12-20 |
DE2414143B2 (en) | 1981-01-15 |
FR2231153B1 (en) | 1978-01-20 |
ATA250874A (en) | 1976-01-15 |
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