JH's VCO, wavetable source, variable ramp

[Rob]

hehe.. This reminds me of a discussion I had with someone about the
difference of the sound of a ramp up wave and a ramp down..

Now, otoh, some of the best VCO designs sound great because the frequency
changes the waveform changes slightly..This would be great to implement on a
wavetable.

Rob

-----Original Message-----
From: harry bissell <harrybissell at prodigy.net>
To: mbartkow at ET.PUT.Poznan.PL <mbartkow at ET.PUT.Poznan.PL>
Cc: synth-diy at mailhost.bpa.nl <synth-diy at mailhost.bpa.nl>;
Barry.L.Klein at wdc.com <Barry.L.Klein at wdc.com>; martin.czech at intermetall.de
<martin.czech at intermetall.de>
Date: Wednesday, July 07, 1999 12:53 PM
Subject: Re: JH's VCO, wavetable source, variable ramp


>:^) I'm still not convinced. There are many "geometric" shapes that look
different to
>the Human Eye that have exactly the same harmonic recipe (amplitude). That
leaves
>"phase" and the ability of humans to hear that in the frequency domain
(20-20KHz) is
>still debated hotly. Filtering probably won't change that.
>
>A variable slope ramp and a "PWM" will have different harmonic amplitude
spectra for
>sure. They may lie outside human hearing range. But a 25% and 75% vatiable
ramp sound
>exactly the same and you can't tell the phase difference in the frequency
domain
>range of human hearing... The time domain is quite another thing (LFO...)
>
>I thought the VCS3 had variable ramp or was that some other unit ????
>
>:^) Harry
>