[sdiy] Analysis of the TB-303 CPU timing

[cheater00 cheater00]

It doesn't. You just listen to the phasing between tge note you're timing
and the pattern you're using as timing base.

On Sun, 19 Mar 2017 10:58 , <rsdio at audiobanshee.com> wrote:

>
> On Mar 16, 2017, at 1:47 PM, Richie Burnett <rburnett at richieburnett.co.uk>
> wrote:
> > I couldn't hear any difference there, but that's quite a slow leisurely
> pattern.  You're more likely to hear a given amount of ms of jitter on a
> faster pattern, so try a pattern with loads of repeating 16th notes at a
> frantic tempo with generous use of accents and slides.  That might be more
> revealing.  (Also use higher pitched notes to reveal timing detail, because
> it's easier to perceive onset timing for notes with higher fundamental
> frequencies.)
>
> I think you need to give some values in Hertz to clarify "higher pitched"
> notes.
>
> For binaural sound localization, frequencies below 80 Hz are difficult or
> impossible to localize because the phase difference between the ears is too
> small. Above 80 Hz and up to 800 Hz, the human brain can use time delays to
> localize sound, based on the inter aural time delay of 625 microseconds.
> Above 1.6 kHz, the dimensions of the head are greater than the length of
> the sound waves, so it's not possible to localize based on phase. This is
> where level differences come into play for localizing sound.
>
> Of course, all of that is dealing with really small time delays for
> sensing the direction that a sound is coming from, assuming that the same
> sound wave hits both ears. I don't know how that relates to general
> perception of timing, but it seems like super-high frequencies might also
> present difficulties. Timing of transitions from silence to note triggers
> might have no upper limit on frequency. I'm just curious whether you have
> any suggested frequency ranges.
>
> Brian
>
>
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