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原因很简单: , Y; G/ ~! Q- s, A/ m+ L9 K+ i- H5 y& _8 b" l
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 noise or distortion introduced in the data cable may further influence the process of clock recovery. 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.7 N. B: o5 [4 r2 O' e" }# J 作者: eternal0 时间: 2011-4-30 17:22
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正确设置且没有误码的话,数字输出理论上可以无损,有损的都是系统混音器或驱动没有设置好。 0 S* L: v/ [9 H7 m 0 A) I7 U0 d, r! p- K问题在于数字输出用于对录和回放时是不同的,对录时只需要每一bit没有错误且顺序正确就可以,但是回放时却需要每一位到达的时间也正确。1 n' ]! @. c6 ]/ O' M
解决方法就是让DAC用自己的时钟或者支持Word Clock IN。 ( E g/ W: \, m& u