esldude Posted October 23, 2017 Share Posted October 23, 2017 46 minutes ago, Ralf11 said: Does most hifi equipment have a single clock domain or > 1? Plenty of gear has at least two. One is for 44.1 khz and multiples of that, 88 khz, 176 khz, and 352 khz. Then another for 48 khz sample rates and multiples. And always keep in mind: Cognitive biases, like seeing optical illusions are a sign of a normally functioning brain. We all have them, it’s nothing to be ashamed about, but it is something that affects our objective evaluation of reality. Link to comment
Ralf11 Posted October 23, 2017 Share Posted October 23, 2017 but most signals would not cross those, right(?) OTOH, wouldn't a USB signal normally cross from the origin to the DAC clock? Link to comment
jabbr Posted October 23, 2017 Share Posted October 23, 2017 8 hours ago, Ralf11 said: but most signals would not cross those, right(?) OTOH, wouldn't a USB signal normally cross from the origin to the DAC clock? All digital signals are clocked. Clocks have phase and frequency. Data coming into a DAC from externally has an external clock domain. In order to get into the DAC it must cross into the internal clock domain. One way is FIFO. Packets at X frequency are collected in the FIFO and read out by the internal DAC clock (typically either 44.1 or 48 kHz families). This has the potential for the lowest jitter. Another way is a PLL where the PLL syncs the internal clock to the external data, or else uses the external clock to clock the DAC itself. So unless a signal "crosses" into the DAC domain, the signal can't enter the DAC. Custom room treatments for headphone users. Link to comment
Ralf11 Posted October 23, 2017 Share Posted October 23, 2017 my 45 year old course in digital circuits does not provide me the ability to understand your answer but thanks anyway... Link to comment
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