Energy-efficient consumer device audio power output stage with gain control
US9705458B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 2015 |
| Grant date | Jul 11, 2017 |
| Priority date | — |
| Expiry date | Sep 7, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/507
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An energy-efficient consumer device audio power output stage with gain control provides improved battery life and reduced power dissipation without clipping the audio output signal. A control circuit controls a power supply that supplies the power supply rails to the power amplified output stage. The voltage of the power supply rails is controlled in conformity with an input audio signal level, which may be determined from a volume control setting of the device and/or from a signal level detector that determines the amplitude of the signal being amplified. The gain applied to the audio input signal is reduced for a predetermined time period when a higher output voltage of the power supply is selected, to avoid clipping the audio output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.