Patent ID: 9161122
Filing Date: 2015-10-13
Classification: H04R

Abstract:
1. A differential interpolation pulse width modulation (iPWM) DAC apparatus, connected to an input digital audio data stream, comprising: an iPWM module for generating differential pulses from said input digital audio data stream; a power driver, connected to said iPWM module, for providing energy to a terminal load; and a filter, connected to said power driver, for removing unwanted harmonic signals to reconstruct an analog signal before outputting to said terminal load; wherein said iPWM module further comprising: a pulse width modulation (PWM) pulse generator to receive and convert said input digital audio data stream to a series of time domain pulses; an interpolation resolution unit, connected to said PWM pulse generator, to increase the time domain resolution of said time domain pulses; a self-calibration unit, connected to said interpolation resolution unit, to maintain the pulse-width accuracy of said interpolation resolution unit; and a differential pulse width generator, connected to said PWM pulse generator and said interpolation resolution unit, to convert said series of time domain pulses into voltage and time domain differential form.