DeltaSigma MODULATOR, SHUT DOWN METHOD OF DeltaSigma MODULATION, PROGRAM, AND RECORDING MEDIUM

摘要

PPROBLEM TO BE SOLVED: To achieve a modulator capable of restricting a pop sound without increasing meaninglessly switching times in an amplified circuit. PSOLUTION: A modulation time digital amplifier ( modulation circuit) 100 includes a pulse width adjusting circuit 140 for correcting values of switching signals ( modulation signal) #41 and #42 such that a pulse width does not reduce a lower limit pulse width. A noise reduction control circuit 200 gradually decreases the lower limit pulse width of the pulse width adjusting circuit 140. PCOPYRIGHT: (C)2009,JPO&INPIT