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发表于 2010-5-27 22:20:29
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原帖由 bojinov 于 2010-5-27 21:46 发表
鼠大 我一直对异步隔绝jitter的看法存疑 usb信号里并没有时钟。
QB9的jitter数据也一般般而已。
它的精华应该是fpga生成了高精度的时钟供1020(6M)以及后面的分立输出级
你就是蓝子风吧?
Stereophile对QB-9的Jitter测试数据应该是满乐观的呀: Conventional USB DACs do badly on this test, but the asynchronous USB mode developed by Gordon Rankin and used in the QB-9, which slaves the host computer to the DAC, works well. the QB-9 performs significantly better than, for example, the Cambridge DacMagic (see fig.12 in that review), which has a conventional USB input. The asynchronous USB mode works as advertised. QB-9Jitter测试发现的问题是右声道有120Hz电源干扰,左声道则毫无问题。 |
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