Amplifying and equalizing
US4179669A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1978 |
| Grant date | Dec 18, 1979 |
| Priority date | — |
| Expiry date | Jun 5, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G9/025
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Left and right stereo power amplifiers receive power from the 12-volt D.C. automobile supply bypassed by a single capacitor for both amplifiers and energize left and right loudspeakers in series with the junction of the series-connected speakers coupled to ground through a capacitor that allows the left and right speakers to be independently driven by the left and right power amplifiers, respectively, by spectral components above the crossover frequency determined by the speaker impedance and the capacitor impedance. Each power amplifier is driven by an equalizing circuit including a photocell illuminated by an LED that is driven by a feedback signal from the power amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.