Patent ID: 7612696
Filing Date: 2009-11-03
Classification: H03H,H03M

Abstract:
1. A method of decimating a Pulse Width Modulated (PWM) signal, the method comprising: computing at least one timestamp of the PWM signal, the PWM signal being at a first sample rate, the at least one timestamp being computed at a second sample rate, wherein the first sample rate is higher than the second sample rate; generating a plurality of pre-filter signals based on each of the at least one timestamp and a plurality of translation factors, a pre-filter signal being generated at the second sample rate having a frequency based on the second sample rate; filtering the plurality of pre-filter signals at the second sample rate using a plurality of Infinite Impulse Response (IIR) filters, each IIR filter corresponding to at least one translation factor of the plurality of translation factors, resulting in a plurality of intermediate decimated PCM signals; and combining the plurality of intermediate decimated PCM signals to produce a Pulse Code Modulated (PCM) signal the PCM signal being at the second sample rate.