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21.
TECHNOBABBLE
The Multiwave Mega is a analog / digital hybrid.
On the analog side with got the preamp, sample and hold and
the resonant lowpass filter. On the digital side we have a
microcontroller that handles the oscillators, filter control, the
LFOs and the buttons.
It uses a CMOS based preamp stage that converts the guitar
signal into a square wave and then multiplies the frequency by
64 using a Phase Locked Loop together with a binary counter.
This is needed so that the microcontroller doesn’t have to do
anything too demanding using timers. It simply uses an
external interrupt to cycle through the waveshape arrays.
The oscillators are wavetable based, which means that every
waveshape is stored as an array of numbers that represents
pwm duty cycle (voltage levels) for a single waveshape cycle.
It has a 6-bit resolution (64 steps) for the oscillators and the
LFO, and a 7-bits resolution (128 steps) for the envelopes.
It has a total of 35 wavetables stored on the microcontroller
for the different waveshapes (and one for each detune setting)
with a few unique wavetables for the envelopes and the LFO.
Summary of Contents for Multiwave Mega
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