Method of outputting audio signal and audio signal output apparatus using the method

摘要

An audio signal output apparatus includes a modulation signal generator for generating a first modulation signal by pulse-modulating an input audio signal of one channel using a first carrier signal or a first sampling clock, which has a first frequency; a vacuum tube filter unit comprising a vacuum tube and for generating a vacuum tube signal by allowing the first modulation signal to pass through the vacuum tube a frequency modulation unit for generating a second modulation signal by pulse-modulating the vacuum tube signal and a power switching amplifier for outputting an amplification signal corresponding to the second modulation signal.