Patent ID: 9226053
Filing Date: 2015-12-29
Classification: H03F,H04R

Abstract:
1. A digital speaker system driving a digital speaker having s pairs of digital input terminals, comprising: a ΔΣ modulator which modulates a digital input signal and outputs an n bit digital signal; a post filter which is connected to the ΔΣ modulator and outputs an m bit digital signal obtained by miss-match shaping the n bit digital signal; s number of driving circuits each of which corresponds to one of the s pairs of digital input terminals and to each of which one part of the m bit digital signal is input and each of which outputs a digital signal; and a power circuit which supplies power to the ΔΣ modulator, the post filter, and the s number of driving circuits; wherein each of s number of driving circuits has a first output circuit connected to a first input terminal of a corresponding digital input terminal and a second output circuit connected to a second input terminal which forms a pair with the first input terminal of a corresponding digital input terminal; and wherein the driving circuit has at least three states of digital signal output according to the combination of a first digital signal input to the first output circuit and a second digital signal input to the second output circuit.