作者Muchin

當我還不大懂 jitter 時，也常分辨不出資訊的對錯，而被那類觀念所惑。雖然你認識業界人士，但對 jitter 的瞭解似乎不夠，大概是由於 jitter 很容易被誤解。如將 jitter 當作 mark/space 的 SD (σ)，那你的看法是對的；但我要特別強調，DVD規格書明白定義 jitter 是針對 slice 後的訊號而言，請看 ECMA 337 說的：

"Jitter is the standard deviation σ of the time variations of the binary read signal. This binary read signal is created by a slicer, after feeding the HF signal from the HF read channel through an equalizer and LPF (see Annex D). The jitter of the leading and trailing edges is measured relative to the PLL clock and normalized by the Channel bit clock period."

另參閱行家的話：

http://www.pcdvd.com.tw/showpost.php?p=1077413180&...