|
4#
樓主 |
發表於 2008-12-23 13:21:11
|
只看該作者
原帖由 monkeybad 於 2008-12-23 11:27 AM 發表 + v1 i6 ~6 a& x8 L w
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)
- |* Z9 G' v! j" }: QSDM 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 # X. Q! m/ z$ c0 r' g. q y
# Y. T* i7 G W0 @% {3 g20K is the BW of human hearing, 8 A) X% G0 D2 a7 G q4 ~$ h" N- R
what is the difference of 44.1/48/96/192KHz data sample rate in audio when this signal is over 20KHz?# j3 S9 N2 O9 D
SDM ADC uses over sampling for gaining high SNR. the oversampling rate will be 64/128/256 fs." w! o$ _8 {+ A: ]6 c, k
the fs is 44.1/48/96/192KHz.
4 x$ X; [/ B gSDM ADC with over sampling rate is right point, but sample rate didn't have direct relation with SDM. |
|