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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
$ @2 Q4 N1 m: ?/ T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)
+ q6 v0 s+ t0 f9 c' ?* USDM 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 6 z; j: Q( m0 Q3 w
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20K is the BW of human hearing,
: o+ V1 f1 p6 _6 G/ [9 K( Rwhat is the difference of 44.1/48/96/192KHz data sample rate in audio when this signal is over 20KHz?
( r$ K$ v5 m4 NSDM ADC uses over sampling for gaining high SNR. the oversampling rate will be 64/128/256 fs.( w, m9 b6 d" ~2 f/ r& V# S/ i0 a+ u
the fs is 44.1/48/96/192KHz. + S; O+ S3 d$ s0 y4 F
SDM ADC with over sampling rate is right point, but sample rate didn't have direct relation with SDM. |
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