I see a barely noticeable peak/spike at the top of my 2002 era NTO sine wave
outputs. This doesn't seem like it would add much harmonics. The overall
shape is a little more rounded than a sine wave, but this is typical of sine
waves shaped from triangle waves.
If I get a chance I'll run this through Wavelab's FFT and see what the
harmonic content is.
My 1995 era QUO sine output does not have the spike, and the shape looks
pure sine to me. Maybe Serge did use a high Q filter circuit for this
despite the hold function. Now I'm getting curious.
My QUO frequency tops out at 577 Hz, even with maximum VC input, so this has
limited use as an audio oscillator.
John Loffink
The Microtonal Synthesis Web Site
http://www.microtonal-synthesis.com
The Wavemakers Synthesizer Web Site
http://www.wavemakers-synth.com
outputs. This doesn't seem like it would add much harmonics. The overall
shape is a little more rounded than a sine wave, but this is typical of sine
waves shaped from triangle waves.
If I get a chance I'll run this through Wavelab's FFT and see what the
harmonic content is.
My 1995 era QUO sine output does not have the spike, and the shape looks
pure sine to me. Maybe Serge did use a high Q filter circuit for this
despite the hold function. Now I'm getting curious.
My QUO frequency tops out at 577 Hz, even with maximum VC input, so this has
limited use as an audio oscillator.
John Loffink
The Microtonal Synthesis Web Site
http://www.microtonal-synthesis.com
The Wavemakers Synthesizer Web Site
http://www.wavemakers-synth.com
> -----Original Message-----
> From: sasami@... [mailto:sasami@...]
> >
> >1) I have read comments about the NTO/PCO not having "pure" sine
> >waves due to the waveshapers used in these modules. Does the QUO
> >utilize the same circuits or does it in fact produce true sines?
>
> That would be expected. The sine generator is the exact same generator as
> used in the tripple wave shaper and the original VCOs. In my experience,
> it
> leaves a glitch or at best, some distortion.
>