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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 8 D, Q' Q% e: ~+ M4 x
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)
% C2 \8 a) W( `SDM 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 . f, i: [& J f6 M1 \7 N' f
- Z- C3 M* K" [. y7 {1 ^20K is the BW of human hearing, 9 t6 Y! o4 Y$ ^
what is the difference of 44.1/48/96/192KHz data sample rate in audio when this signal is over 20KHz?6 A- p* M& v5 K/ U0 v1 N2 D4 a
SDM ADC uses over sampling for gaining high SNR. the oversampling rate will be 64/128/256 fs.
" x J8 ?- f7 O9 q5 ythe fs is 44.1/48/96/192KHz. 2 V, i: a( Z% D5 E
SDM ADC with over sampling rate is right point, but sample rate didn't have direct relation with SDM. |
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