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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 * P5 B, u3 C! P9 i" b2 C* J
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)
3 Q2 {, Q, n+ G8 ^: g# A2 rSDM 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,
, [. f5 C" \% s# Y: _6 `1 [. E Dwhat is the difference of 44.1/48/96/192KHz data sample rate in audio when this signal is over 20KHz?
* b) T9 o/ W s& j3 d1 N p1 U( A& D: D3 TSDM ADC uses over sampling for gaining high SNR. the oversampling rate will be 64/128/256 fs.
: ?& c. m- d7 G- ]7 Jthe fs is 44.1/48/96/192KHz. / x, A2 C/ L* H" B
SDM ADC with over sampling rate is right point, but sample rate didn't have direct relation with SDM. |
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