METHOD AND CIRCUIT FOR EFFECTIVELY CONVERTING PCM DATA INTO PWM DAT, ESPECIALLY REDUCING CALCULATION COST AND EFFECT

摘要

PURPOSE: A method and a circuit for effectively converting the PCM data into the PWM data are provided to securing a high linearity of overall conversional processes such as PCM->PWM->D/A. CONSTITUTION: A circuit for effectively converting the PCM data into the pulse width modulation(PWM) data includes a digital signal process(1) provided with a first oversampling block(4), a forward-compensation conversion block(5), a second over sampling block(6), a noise shaper(7) and a PWM generator(8). The circuit converts the digital code signal(PCM, f(t)) into the PWM signal. And, the circuit is characterized in that the digital signal(PCM,f(t)) is multiplied by at least one derivative functions(f'(t),f''(t)...f(n)(t)).