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To encode the Chamberlin form in the FAUST language, it is helpful
to redraw its diagram more like the FAUST compiler would:
- Signal flow strictly left to right, except for feedback
- Feedback paths go up and around instead of down and around
- Delays due to feedback are drawn as such
This is shown in Fig.5 along with the FAUST encoding of the
diagram. Note that the added delay from the digitization of the first
integrator (using forward-Euler) has been ``pushed'' through the
second integrator and into the outer feedback loop, resulting in the
unit-sample time advances
and
. One can use
faust2firefox (or the FAUST online compiler) to display
the block diagram directly from the code, as shown in Fig.6
for the following program:
g=0.1; // wcT or 2*sin(wcT/2)
process = ( + : ( + <: (*(g):+~_),_)~*(0-sqrt(2)) : (_ <: (*(g):+~_),_),_)~*(-1);
Figure:
Redrawing of Fig.4 in a more FAUSTian style.
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Figure 6:
Block diagram generated by faust2firefox.
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