Patent ID: 6657566
Filing Date: 2003-12-02
Classification: H03M

Abstract:
A signal converter for converting a PCM input signal into a UPWM output signal, the signal converter comprising:a UPWM converter that receives a UPWM converter input signal and generates the UPWM output signal in the form of output pulses of variable widths based on the UPWM converter input signal, a first set of correction signal paths that receives the PCM signal and generates a first set of respective correction signals, each correction signal path of the first set of correction signal paths comprising a non-linear generator function in series with a linear correction filter, a summing unit that combines the first set of respective correction signals with a linearly filtered first PCM signal to provide an error-corrected PCM signal, the first set of correction signal paths comprising at least one correction signal path, the error-corrected PCM signal suppressing at least one of non-linearity and noise generation within the signal converter caused by conversion of the PCM input signal into the UPWM output signal.