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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 ( c$ w# k% Z. q' p& x1 `$ _/ |
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)
, H7 i8 {1 f( ]6 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
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! G# h( x! p* `$ Z20K is the BW of human hearing,
( c2 m: V! p6 c) k0 m1 T# swhat is the difference of 44.1/48/96/192KHz data sample rate in audio when this signal is over 20KHz?
( w' @$ t; z* q# RSDM ADC uses over sampling for gaining high SNR. the oversampling rate will be 64/128/256 fs.
) ?7 f0 @, Z- U; Rthe fs is 44.1/48/96/192KHz. 6 V- P& J% m; R0 q
SDM ADC with over sampling rate is right point, but sample rate didn't have direct relation with SDM. |
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