Amplifier with adjustable ramp up/down gain for minimizing or eliminating pop noise
US9673762B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 2015 |
| Grant date | Jun 6, 2017 |
| Priority date | — |
| Expiry date | Oct 22, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/375
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A variable ramp up/down gain in a pre-power stage block of an audio amplifier may be used to reduce audible pops and clicks output by the audio amplifier. A controller may adjust the variable ramp up/down gain during operation of the audio amplifier. The variable ramp up/down gain may be implemented as a pulse width modulation (PWM) modulator/generator with a ramp-up and ramp-down gain under control of the controller. The variable ramp up/down gain smooths transitions of the offset between a pre-power stage block and a feedback loop and thus can reduce audible pops and clicks by reducing the offset that is amplified in the power stage block of the audio amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.