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發表於 2008-12-23 13:21:11
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原帖由 monkeybad 於 2008-12-23 11:27 AM 發表
! m% {; F N$ f" x, {5 `雖然SDM ADC是用192K當作sample rate, 但是要處理的聲音信號還是在20K(這是人耳廳的到的的頻寬)
( u3 x$ ]' W' aSDM ADC是用over sampling的技巧讓SNR提高, 所以sample rate通常會比信號的頻寬要大上許多倍
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20K is the BW of human hearing,
* J- V; Z5 l S2 L& w0 }' u7 d$ Lwhat is the difference of 44.1/48/96/192KHz data sample rate in audio when this signal is over 20KHz?# R' @- J! j3 f" }, j3 l; b: a
SDM ADC uses over sampling for gaining high SNR. the oversampling rate will be 64/128/256 fs.
, t6 B* S. F9 j" Xthe fs is 44.1/48/96/192KHz. - q# F8 g+ _1 \1 f& s
SDM ADC with over sampling rate is right point, but sample rate didn't have direct relation with SDM. |
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