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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
R/ O1 ^. h& f% P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)
1 F9 J% X# E2 x& U/ U' E1 P& A* OSDM 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, " `! ]; O4 Z/ T$ a1 `4 ?1 q
what is the difference of 44.1/48/96/192KHz data sample rate in audio when this signal is over 20KHz?7 h7 X$ g% q* n% }/ v: {
SDM ADC uses over sampling for gaining high SNR. the oversampling rate will be 64/128/256 fs.+ a3 m, a& k& W1 x' F
the fs is 44.1/48/96/192KHz. 9 g7 p. P: W7 m) q- L
SDM ADC with over sampling rate is right point, but sample rate didn't have direct relation with SDM. |
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