DIGITAL AMPLIFICATION METHOD AND DIGITAL AMPLIFICATION CIRCUIT

摘要

PROBLEM TO BE SOLVED: To attain reduction of pop noise that is generated in operation start/end in a digital amplification circuit in which an inputted analog audio signal is modulated digitally and power amplification is performed thereon. SOLUTION: A digital amplification circuit is provided which is configured to perform pulse modulation while suppressing power supply voltage variations caused by a rapid change in an amplitude of an output pulse signal by gradually increasing a peak value of the output pulse signal of the digital amplification circuit in operation start (powering-on) and by gradually attenuating the peak value of the output pulse signal in operation end (powering-off). COPYRIGHT: (C)2007,JPO&INPIT