Digital amplifier, pulse width modulator thereof and method for reducing pop noise for the same
US7508873B2 · kind B2 · utility
0Cited by
5References
15Claims
0Family size
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Key dates
| Filing date | Jul 28, 2005 |
| Grant date | Mar 24, 2009 |
| Priority date | — |
| Expiry date | Apr 30, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/351
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A pulse width modulator for use in a digital amplifier, includes a pop noise reducer for reducing pop noise by controlling a width and a phase of a pulse of a PWM signal output from the pulse width modulator, wherein the pop noise reducer contains: a PWM pulse register for storing a width and a phase values of a pulse of the PWM signal; and a pulse generator for outputting the PWM signal according to the values stored in the PWM pulse register. The pulse width modulator reduces pop noise generated when power supply to a digital amplifier is started and interrupted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.