Patent ID: 9219960
Filing Date: 2015-12-22
Classification: G06F,H04R

Abstract:
1. An acoustic playback system comprising: a digital filter; and a plurality of digital modulators each of which outputs a modulated digital signal to one of a plurality of speakers having different play back frequency bandwidths; wherein the digital filter converts a digital audio signal which is input to a plurality of digital audio signals of a plurality of frequency bandwidths corresponding to play back frequency bandwidths of the plurality of speakers, and outputs each of the digital audio signals of the plurality of frequency bandwidths to one of the plurality of digital modulators; each of the plurality of digital modulators outputs a modulated digital signal to the speaker of a play back frequency bandwidth corresponding to a frequency bandwidth of the digital audio signal which is input by performing miss match shaping after noise shaping to a digital audio signal which is input; each digital modulator outputs a modulated digital signal having a different number of bits; and the higher the play back frequency bandwidth of a speaker to which a digital modulator of the plurality of digital modulators outputs the modulated digital signal, the fewer the number of bits included in the modulated digital signal that is output by the digital modulator to the speaker.