02_01_5
additional parameters: none


This is the ACCCI implementation of Risset's 'Spectral Analysis
of a Chord': for each note of the chord successive harmonics are
introduced gradually. Originally, the score file has been created
with the help of a PLF sub routine (Mathews 1969: pp.78-86).
Slightly different routines were used on each of the three two
note groups, as is shown in brackets in the figure below.


(illustration)

4 harmonics for group 1, 
8 harmonics for group 2 and 
10 harmonics for group 3 are generated in turn. 


The durations of the successive harmonics are related to the
fundamental note duration D by D-DD.

If DD = 0, they have the same duration as the fundamental, as
shown to the right. The total duration of the sound for N
harmonics is then given by: D(total) = D + N * TS. 

For generation routine 2 the pattern is different:

(illustration)

The envelope has a parabolic attack and decay. This shape is
created by the linear f31 multiplied by itself. The general
design is additive. (Risset 1969: #500)

(flowchart)
(.orc and .sco files)

