【转】关于9018芯片自带的几种数字滤波器模式区别

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There are filters that can be changed in the DAC depending on digital format played. (Note: The sound differences between filters are quite subtle that slightly tweaks the overall sound signature of the DAC.) There is DSD which offers 3 filters (50k, 60k, 70k) and PCM which offers 2 filters (Fast, Slow). Generally for the DSD, there are hardly any sound differences between them, with the 70k filter setting being slightly airier than the others. As for PCM, the fast filter has a brighter and engaging sound. The slow filter has a smoother treble which can help tame down brighter recordings or poor recordings which has presence of artifacts.


滤波器的选择取决于DAC的接受的数字音频格式。（注：滤波器之间的声音差异是很微妙的）
DSD提供3种模式（50K、60K，70K），PCM提供2种模式（快，慢）。
对于DSD，声音之间几乎没有差异，70K的置略妙于其他。
对于PCM，快速模式具有更迷人的声音。慢速模式高音更平滑，可以帮助驯服过亮的录音或那些“文物”级录音。

The DAC202 uses the premium ESS9018 DAC chip, which allows for two digital filters (here labeled A and B) to be used. According to designer Daniel Weiss, filter A is optimized for an ideal stopband corner frequency, while filter B has a relaxed transition band that gives the optimum transient response.

weiss dac202采用优质ess9018 DAC芯片，它有两种数字滤波器模式（这里标记为A和B）。设计者Daniel Weiss认为，A模式过滤器可以阻带起始频率，而B有一个舒缓的过渡频带，给出最佳的瞬态响应。



另外，9018的dpll数字锁相环也有几种模式，从low到high，简单来说就是转盘过来的jitter越低，dpll就可以选择越低，去除jitter效果也越好。

bbfat49

我记得在另外一个贴里面说vega绕过了9018内置的滤波，提供了自己的6种滤波。dsd，其实差异不大是50k和70k，pcm4种差异很大。