Re: Timing problem on PPC based Macs (PortAudio)
Re: Timing problem on PPC based Macs (PortAudio)
- Subject: Re: Timing problem on PPC based Macs (PortAudio)
- From: "Ross Bencina" <email@hidden>
- Date: Sat, 21 Mar 2009 15:19:36 +1100
Hi James
How does a modern Mac's CPU timebase accuracy compare against a mid- price
digital audio device's samplerate accuracy?
Would there be reason to expect that a Mac Pro's UpTime or
mach_absolute_time nanosecond measurement would be more long-term-
accurate, less long-term-acurate, or about the same long-term accuracy
compared to a nice mid-price audio interface like a MOTU 2408mk3?
I don't know how they compare, but one factor to consider is that often
these machines use NTP to synchronise their time APIs to a network time
base -- afaik the synchronisation algorithms calibrate correction factors
for the local clock rate vs. a network standard time base, and this can
become "pretty accurate" over time. I'm not sure how tempurature affects
things though.
Ross.
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