Patent ID: 9544691
Date: 2017-01-10
CPC Classifications: G06F,H04R

Claim:
1. A speaker box comprising: a housing having an opening; a digital speaker being input k number of digital signals and disposed in the opening; a digital modulation circuit driving the digital speaker formed in the housing, wherein the digital modulation circuit includes a filter converting an input digital audio signal and outputting a digital signal of m bits; and k number of driving circuits, one part of the digital signal of m bits being input to the k number of driving circuits respectively, and the k number of driving circuits outputting the k number of digital signals to the digital speaker, wherein the digital modulation circuit further includes a ΔΣ modulation circuit and is disposed in close proximity to the digital speaker, wherein the digital modulation circuit filters a digital signal of a certain frequency bandwidth from the digital audio signal being input and performs noise shaping and miss match shaping, and wherein the digital modulation circuit further includes a controller controlling parameters of one or more digital signal processors operable upon a frequency bandwidth filtered by the digital modulation circuit, a noise shaping oversampling rate, and a degree of miss match shaping.