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4#
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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 ![]()
/ l/ n* b* W$ l1 D z$ l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)
0 P* Y* n& {# I% S" pSDM 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 ) C' I& Z, C G* [/ t9 @3 n
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20K is the BW of human hearing,
2 o5 o3 d# L$ h h: K: c+ {what is the difference of 44.1/48/96/192KHz data sample rate in audio when this signal is over 20KHz?/ F& L/ R9 S6 J0 O* A
SDM ADC uses over sampling for gaining high SNR. the oversampling rate will be 64/128/256 fs.0 ~" b5 ]1 |; y9 W/ B! d% X
the fs is 44.1/48/96/192KHz.
* u. T, i& Y& m7 J8 w% D/ \SDM ADC with over sampling rate is right point, but sample rate didn't have direct relation with SDM. |
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