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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 1 `1 ?( R5 k3 O
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)' J# [9 H! e4 B3 V4 K
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 4 M- x, j/ o% i6 t
" P# l; N, v; o! z9 t: Q: s3 D20K is the BW of human hearing,
& ]+ J/ g# f M; B9 h5 Z9 Lwhat is the difference of 44.1/48/96/192KHz data sample rate in audio when this signal is over 20KHz? W6 E3 {9 `+ M9 K0 ^
SDM ADC uses over sampling for gaining high SNR. the oversampling rate will be 64/128/256 fs./ j1 _( V7 F) ^6 q2 X# Z
the fs is 44.1/48/96/192KHz. 0 R; y) ?5 V/ p! W: }' e
SDM ADC with over sampling rate is right point, but sample rate didn't have direct relation with SDM. |
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