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Diffstat (limited to 'docs/design.org')
| -rw-r--r-- | docs/design.org | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/docs/design.org b/docs/design.org index d52ce05..c111716 100644 --- a/docs/design.org +++ b/docs/design.org @@ -89,4 +89,34 @@ An Instrument is N Sine(?) waves with an Envelope applied to it. it implements Iterator so that ~next()~ sums the oscillators, scales them down by 1/N, and multiplies by the Envelope value. +** Partial + + + The four arguments to each invocation of the partial abstraction specify: + +amplitude. +The amplitude of the partial at its peak, at the end of the +attack and the beginning of the decay of the note. + +relative duration. +This is multiplied by the overall note duration (controlled +in the main patch) to determine the duration of the decay portion of the +sinusoid. Individual partials may thus have different decay times, so that +some partials die out faster than others, under the main patch's overall +control. + +relative frequency. +As with the relative duration, this controls each partial's +frequency as a multiple of the overall frequency controlled in the main +patch. + +detune. +A frequency in Hertz to be added to the product of the global frequency and the relative frequency. + +Inside the partial abstraction, the amplitude is simply taken directly +from the ``$1" argument (multiplying by 0.1 to adjust for the high individual +amplitudes); the duration is calculated from the r duration object, multiplying +it by the ``$2" argument. The frequency is computed as $fp+d$ where $f$ +is the global frequency (from the r frequency object), $p$ is the relative +frequency of the partial, and $d$ is the detune frequency. |