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发表于 2011-4-23 20:47:08
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原帖由 冰冰鱼 于 2011-4-23 20:41 发表
这也不是什么新玩意,chord多年前从DAC64开始就一直是这么作的了,还可以选择buffer的大小。 我记得CHORD只是缓冲,时钟还是根据前面信号传过来后再锁出来的。所以有人说chord一定要配套使用,不然效果不好。
“I referred above to the RAM buffer. This is basically arranged as a FIFO (First-In, First Out) store. In theory, the clock accuracy with which the data are clocked into the FIFO doesn't matter, as the data are clocked out with a high-precision local crystal, which in turn should reduce jitter to vanishingly low levels. In practice, there has to be some means of locking the local clock to the long-term-averaged clock of the incoming data, which will mean low-frequency jitter might still propagate to the DAC chip. But because Chord uses a very much larger FIFO than is usual, all jitter in the incoming data above a very low frequency should be rejected.”
http://www.stereophile.com/digitalprocessors/624
chord还是被动模式。事实上DAC64那个年代那个价格把DAC做成支持主动模式可能性也不大。
[ 本帖最后由 feifazhuce 于 2011-4-23 21:00 编辑 ] |
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