Patent ID: 8725280
Filing Date: 2014-05-13
Classification: G11B,H03M,H04R

Abstract:
1. An audio output device comprising a ΔΣ modulator including: a quantizer configured to quantize a signal; a subtractor configured to subtract a feedback signal from the quantizer from an inputted digital audio signal; an accumulator configured to accumulate output signals from the subtractor and to output the accumulated output signals to the quantizer side; a delayer included in the accumulator; a multiplier included in the accumulator and connected to an input side of the delayer; and a multiplier coefficient control circuit configured to supply a multiplier coefficient to the multiplier, wherein in the ΔΣ modulator, the multiplier coefficient control circuit decreases the multiplier coefficient down to 0 stepwise at predetermined intervals if there is no input of the digital audio signal.