[sdiy] saw/ramp from square?

[harrybissell at wowway.com]

Symmetrical positive and negative pulses have no even harmonics at all.
It ~would~ sound hollow...  

That is another choice in my guitar synth project. I also have a bass synth
that has a choice between a quasi-triange and a sawtooth... the triangle
sounds like a synth and the saw like a bass guitar. The even harmonics are
really obvious...

H^) harry




On Sat, 17 Jan 2009 12:09:04 -0500, David Moylan wrote
> This method is also the one used in Arp Omni to generate saw type 
> waves for the string sounds (different RC values per note).  You can 
> also choose to rectify the signal or not, so you can get the saw 
> type or the positive and negative pulse which gives it a more hollow 
> sound.
> 
> Dave
> 
> Aaron Lanterman wrote:
> > On Dec 31, 2008, at 4:26 PM, Scott Nordlund wrote:
> > 
> >> A simpler way to get a "sort of" saw would be to highpass filter the 
> >> square wave and then half-wave rectify the output.  It will have a 
> >> strange formant (and will similarly impart this formant when used for 
> >> PWM), but it's still good for some purposes. You could also alter the 
> >> wave shape by adjusting the highpass filter or DC offset on the 
> >> rectifier.
> > 
> > The Music Easel has a curious waveshaping circuit that does something 
> > like this to generate the "pulse" from the "square" (see lower left 
> > corner of Board 8 of the 208 Magnus's Buchla Page).
> > 
> > - Aaron
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Harry Bissell & Nora Abdullah 4eva