Method of outputting audio signal and audio signal output apparatus using the method
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United States of America Patent
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Sep 1, 2015
Grant Date -
Aug 2, 2012
app pub date -
Jan 31, 2012
filing date -
Feb 1, 2011
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Abstract
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.
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