Audio signal output circuit and electronic apparatus...

Details Audio signal output circuit and electronic apparatus... Audio signal output circuit and electronic apparatus...

2011-05-31

2011-05-31

Chin, Vivian (Department: 2614)

Electrical audio signal processing systems and devices

Including amplitude or volume control

C381S094500, C330S010000

Reexamination Certificate

active

07953234

ABSTRACT:
A digital audio-signal output circuit is provided, which is capable of outputting an audio signal without generating pop noise. In suppressing pop noise, the audio signal output circuit requires no analog circuit nor mute control signal for external peripheral devices. Upon receipt of a digital input audio signal having an AC component superposed on a reference voltage VREF, the circuit selects one of a pulse-density-modulated audio signal derived from the input audio signal and a transition signal that smoothly varies between zero volt and the reference voltage, and provides the selected signal to speakers.

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