Re: achieving very low latency
Re: achieving very low latency
- Subject: Re: achieving very low latency
- From: Brian Willoughby <email@hidden>
- Date: Sat, 07 Jul 2012 12:50:29 -0700
Nobody made any such claim, misinformed or otherwise.
I made two statements. One, that dedicated audio hardware has lower
latency than general purpose audio hardware. Second, that scientific
lab testing should be done with lab-grade equipment, not general
purpose hardware. Neither of these statements have any relation to
the 30 ms latency reported by the OP.
Even the fastest ASIO hardware setup is fundamentally different from
a zero-latency DAC attached to an embedded firmware-driven processor.
I'm particularly baffled as to why embedded software is being used
for the pushbutton and not for the audio, when such an embedded
system could achieve 0 ms latency (granted, there might be one sample
of latency, depending upon the exact hardware) with the right DAC chip.
If only the OP were testing reaction time, then CoreAudio would be
just fine - that's because the presentation and other latency could
be removed from the measured reaction time to obtain the actual
reaction time. But I got the impression that the subjects under test
were triggering the sounds rather than reacting to them.
Brian Willoughby
Sound Consulting
On Jul 7, 2012, at 11:59, David Reaves wrote:
And MY reply was to the (what I believe is a misinformed) claim
that only with laboratory-grade equipment can sub 30 mS latency be
achieved.
Which is why I brought up ASIO, which uses inexpensive consumer-
grade hardware, and which while not perfect, can easily achieve
latencies that come nowhere close to as long as 30 mS, often in the
single-digit range.
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