US4684899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio amplifier for a motor vehicle
Assignee: Individual
•
Filing: 1986-02-06
•
Granted: 1987-08-04
•
Expires: 2006-02-06
Abstract
Abstract Low frequency amplifier, mainly for use in motor vehicles, of the type comprising an equalizing device and a device for compensating ambient noise, characterized in that the equalizing device (1a) is a fixed-correction-type device placed downstream of the controlled-gain amplifier (2) having the task of compensating the ambient noise.
Inventors
- 👤 Claude Carpentier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:18
CPC Classifications
H; H03; H03G; H03G5/00; H03G5/02; H03G5/04; H03G3/00; H03G3/20; H03G3/30; H03G3/32
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
88 words
Low frequency amplifier, mainly for use in motor vehicles, comprising an equalizing device and means for compensating ambient noise, said means including an ambient-noise microphone, a controlled-gain amplifier controlled by a control voltage and having an outlet with a signal pickup point, and a control circuit for generating said control voltage and having a first input connected to said ambient-noise microphone and a second input connected to said signal pick-up, said equalizing device being a fixed-correction-type device, preset by fixed electronic components, downstream of said signal pick-up point.
Claim 2
Dependent Claim
88 words
Low frequency amplifier, mainly for use in motor vehicles, comprising an equalizing device and means for compensating ambient noise, said means including an ambient-noise microphone, a controlled-gain amplifier controlled by a control voltage and having an outlet with a signal pickup point, and a control circuit for generating said control voltage and having a first input connected to said ambient-noise microphone and a second input connected to said signal pick-up, said equalizing device being a fixed-correction-type device, preset by fixed electronic components, downstream of said signal pick-up point.
Claim 3
Dependent Claim
48 words
Amplifier according to claim 1, wherein said device for compensating ambient noise is preset by second fixed electronic components, said first-named and said second fixed electronic components being combined on a support which is removable and interchangeable so that it can be adapted beforehand to particular predetermined configuration.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |