[sdiy] Synthesizers...

[Antti Huovilainen]

On Tue, 17 Feb 2009, Tom Wiltshire wrote:

> calibration, and looking at the way that the Rhodes Chroma uses a ramp plus a 
> PWM pulse wave to mimic the effect of two detuned sawteeth. Apparently these 
> two are equivalent, but I'm yet to prove it to myself to my satisfaction.

pwm(phase) = saw(phase) - saw(phase + pw)

detuned saw = saw(phase) + saw(phase + pw)
             = 2*saw(phase) - saw(phase) + saw(phase + pw)
             = 2*saw(phase) - pwm(phase)

Antti

"No boom today. Boom tomorrow. There's always a boom tomorrow"
   -- Lt. Cmdr. Ivanova