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發表於 2010-7-20 22:32:50
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同軸或光纖對資料傳輸的影響可參考這篇：
S/PDIF Wiki：
LimitationsS/PDIF lacks flow control and retry facilities, which limits its usefulness in applications outside of synchronous playback.
Because the receiver cannot control the data rate, it instead has to avoid bit slip by synchronising its conversion with the source clock. This means that S/PDIF cannot fully decouple the final signal from influence by the analogue characteristics of the source or the interconnect, even though the digital audio data can normally be transmitted without loss.
The source clock may carry inherent jitter or wander, and the process of clock recovery may be further influenced by noise or distortion introduced in the data cable.
If the DAC does not have a stable clock reference then noise will be introduced into the resulting analogue signal.
However, receivers can implement various strategies which limit this influence.
心得：找台好的擴大機或DAC比較重要。
否則換了S/PDIF數位傳輸線材而造成的聲音變化，可能只是傳輸訊號抖動(jitter)和漂移(wander)所帶來的雜訊(noise)和失真(distortion)的效果。
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USB傳輸的問題，跟S/PDIF不同。小弟在網路上看到一篇討論蠻精彩的，其中的aztec1234網友把USB傳輸方式及原PO者的使用情況作了詳細的分析。
有興趣的網友可以參考一下：
換了USB線完全聽不出差異~怎辦?
心得1：伽馬粒子的理論蠻有趣的，可惜尚無見到任何科學驗證等資料，我想大家都會很感興趣才對。
心得2：USB線材要注重的是「線材本身」有沒有符合USB IF認證...。 |
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[複製連結]
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發表於 2010-7-9 23:23:01
