Messages in this thread | | | Date | Tue, 31 May 2005 17:06:28 -0400 (EDT) | From | "Richard B. Johnson" <> | Subject | Re: Human tIming perception (was: RT patch) |
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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 >> perceptual/motor behavior. > > 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 > around 3-5ms. > > Lee >
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 chords.
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