pallee

回覆 59# ntony

Digital signal transform is DFT, Discrete Fourier Transform. It is the Math model for pulse type discrete time signal. From analog point of view, PCM are pulses.

I don't know DSD signal processing because DSD didn't exist 30 years ago.

pallee

至於黑膠，黑膠近年興起，我見其實佢又有與時並進。因為而家科技可以刻到幾nm。至於支唱針有無科技上嘅躍升我就唔太了解。但其實黑膠都有潛力可以再發展再釋放。但佢嘅缺點就唔係咁易整走。

Unlikely. Plastic is not a good recording media. People like Vinyl's thick mid range sound. Other reasons are memory and taste.

From Vinyl to CD, SN had a big jump to 90 dB.

Good signal convergence (yes, do FFT and see non corelated sharp mountains) gives good sound separation.  Hence wave interference (2 ch, same signal) confuses human brain and creates sound positioning. This is stereo system principle.

In early CD age, most releases were symphony. Good sound positioning bought listeners to a new era.

ntony

回覆  ntony

Digital signal transform is DFT, Discrete Fourier Transform. It is the Math model for  ...
pallee 發表於 2020-8-7 22:38

師兄啱！我講到亂晒龍。

就算我讀DSP時，好似都未有講及DSD。不過我讀得好皮毛。

pallee

off topic

uraki

可能係我表達能力唔好，又或者我表達錯。我知道FFT係個algorithm去轉個domain。我係講緊DSP過程用FFT同e ...
ntony 發表於 2020-8-7 22:34

意會吧. encode 都可以解釋通. 無必要深究呢樣野, 重點不在此.
一個unknown encoding 其實就等於encryption. 因為decode係unknown的... 相等於線係無智能不可能decode/address到入面的DATA. data lost 會係RANDOM. 無可能有PATTERN.

黑膠問題被帶偏... 對黑膠無興趣...
我意思帶出係大家都係出USB, 點解PLAYER有質素高低之分. 有D又話數碼聲, 但有D話比得上高端模擬系統? 又咪出 USB 4條線.