Systems and methods for supply-based gain control of an audio output signal
US9584082B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 17, 2013 |
| Grant date | Feb 28, 2017 |
| Priority date | — |
| Expiry date | Aug 28, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/007
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An audio device may include an electrical terminal for coupling a transducer device to the audio device and an audio circuit for generating an analog audio signal coupled to the electrical terminal. The audio circuit may include a pre-amplifier stage, an amplifier, and a gain selector. The pre-amplifier stage may apply a selectable gain to an audio input signal to generate a pre-amplified analog audio signal, wherein the pre-amplifier stage is powered by a first power supply. The amplifier may amplify the pre-amplified analog audio signal to generate the analog audio signal, wherein the amplifier is powered from a second power supply isolated from the first power supply. The gain selector may select the selectable gain based on a level of the first power supply, such that a difference between the second power supply and the analog audio signal is more than a predetermined headroom threshold voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.