Re: Human tIming perception (was: RT patch)
From: Richard B. Johnson
Date: Tue May 31 2005 - 16:11:41 EST
On Tue, 31 May 2005, Lee Revell wrote:
On Tue, 2005-05-31 at 12:59 -0400, Steve Finney wrote:
It takes (IIRC) about a 10 ms or
so difference in the sounded sequence
for someone to be able to report that there's been a change, but
a cnange in the timing of the person's finger movements occurs
(_immediately_) at perturbations smaller than 10 ms. That is, there
appears to be some dissociation between conscious perception and
Any decent guitar player who has used their computer as an effects unit
could tell you this. I can easily perceive the difference between 1.3
and 2.6, and 2.6 and 5ms latencies. And there's at least one person
(also a guitarist, who I have added to the cc:) who swears he cam
perceive the difference between 0.6 and 1.3ms. Soundcard ADCs typically
add 1.5ms latency in each direction, so the actual floor seems to be
Well MIDI runs at 31,250 bits/second or 3,906 bytes per second.
After much research by Dave Smith in the early 80s, the MIDI
spec was published in 1983. The data-rate was based upon not
being able to hear the difference in the simultaneity of a
6-note chord (a triad with both hands on the piano). That
equates to 1/3906 * 6 = 0.00154 seconds. (1.54 ms).
Note that because only one note start or stop can sent at a
time, this information was essential for sending and receiving
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