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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 ! S; q! |3 u' V2 S
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)
2 V# k9 B" s+ d6 G ^# z) h- XSDM 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 - k5 f4 c* h0 J3 k
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20K is the BW of human hearing,
2 N, Q t( A0 r4 D0 Uwhat is the difference of 44.1/48/96/192KHz data sample rate in audio when this signal is over 20KHz?! g* l& }9 [7 y0 g4 s; h0 Z( Q1 x
SDM ADC uses over sampling for gaining high SNR. the oversampling rate will be 64/128/256 fs.( x+ _ q- n) ]+ C2 `
the fs is 44.1/48/96/192KHz.
- ]3 {. ?2 c H! xSDM ADC with over sampling rate is right point, but sample rate didn't have direct relation with SDM. |
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