引用
最初由 A502ALARM 发布
aaabbbccc 样~~
欢迎发表意见~但是请你发表意见时客观一些、冷静一些~
音乐区是主题讨论为主的~不希望发生无意义争吵~~~~
你说“mp3 at 128kps generally better than MD(when using ATRAC).”
那请你就这个分析一下吧~~~
这个观点我还是第一次看到~~有兴趣~~~
my comments r very much to the point, just some ppl dont like. i am not person who want peace for the sick of peace.
disclaimer: the rest r technical stuff, if u dont understand , go blame urself.
first some presumption. 256kbps mp3 CBR and cd quality r virtually identical. u should read c't(a german magazine) report at 2000 if u dont know.
1. ATRAC normal and ATRAC3. normal is 292kbps stereo and 146kbps mono. ATRAC3 includes 132kbps, 66kbps and ATRAC3plus at 64kbps(only netMD i think). A md disc has 150M capacity, not 600M, not even near.
2. almost all audio codec r doing things the same way. difference between mp3(include mp3pro) and ATRAC is: ATRAC has no entropy coding at the final stage(according to a uk published paper). this is a design decision to make it possible to run on hardware 10 years ago. Accordingly ATRAC quality are lower than 256kbps mp3, more on par with 192kbps CBR mp3. As for ATARC3, it's just a watered down version of normal ATARC to compete with mp3.
3. with VBR, 128mp3 not that much diffent from 192kbps CBR mp3.
BTW, to test the performance of audio codec, best way is ABX double blink test.