Patent ID: 7860474

Claim:
A pulse width modulation circuit comprising: a pulse width modulation encoder for encoding a data sample stream into pulse width modulated patterns; and circuitry for providing a data sample stream with a selectable sample frequency and a selectable range of information levels to the pulse width modulation encoder and including a delta sigma modulator quantizer for providing the data sample stream to an input of the pulse width modulation encoder at a selected sample frequency and with a selected range of quantization levels corresponding to a selected one of a plurality of ranges of information levels, wherein each level within the selected range of information levels corresponds to a digital number and each sample within the data sample stream at the selected sample frequency represents a level within the selected one of the plurality of ranges of information levels and wherein the selected sample frequency and the selected one of the plurality of ranges of information levels are selected such that noise generated at the sample frequency during encoding of the data sample stream into pulse width modulated patterns avoids a selected frequency band.