[sdiy] They aren't sawtooths, they're ramps

[cheater cheater]

Sine shapers are a classical guitar distortion.

D.

On Wed, Nov 4, 2009 at 22:03, Kyle Stephens <lightburnx at yahoo.com> wrote:
> "YOU MEAN THE SIGMOID???? :PPP"
>
> Colloquially know as "Stephensine" ;)
>
>
> _Kyle (asked the list a while back what a saw/ramp through a sine shaper would sound like) Stephens
>
>
> PS: Aaron Lanterman halfway suggested this - I tried running a guitar (aka roughly sine) through the Thomas Henry sine shaper, though my gain stage was pretty noisy as what I happened to have breadboarded up at the time was another effect in progress - got some interesting noises and a compression effect at some settings... More tweaking that latter.
>
> --- On Wed, 11/4/09, cheater cheater <cheater00 at gmail.com> wrote:
>
>> From: cheater cheater <cheater00 at gmail.com>
>> Subject: Re: [sdiy] They aren't sawtooths, they're ramps
>> To: "David G. Dixon" <dixon at interchange.ubc.ca>
>> Cc: synth-diy at dropmix.xs4all.nl
>> Date: Wednesday, November 4, 2009, 1:30 PM
>> > Waveforms derived from
>> relaxation oscillators definitely do not fit the
>> > bill, and therefore should not be called "sawtooth",
>> any more than some
>> > random "rounded" waveform should be called "sine".
>> >
>>
>> YOU MEAN THE SIGMOID???? :PPP
>>
>> On Wed, Nov 4, 2009 at 20:30, David G. Dixon <dixon at interchange.ubc.ca>
>> wrote:
>> >> snip >
>> >> > "Ramp" refers to the ramping part of the
>> sawtooth wave, but could also
>> >> > refer to waveforms where the ramp is an
>> important part of a waveform
>> >> > that's not really a sawtooth wave.  For
>> example; a wave that starts
>> >> > low, ramps up, holds there for a bit, and
>> then resets.
>> >> >
>> >> > Relaxation oscillators are what they are,
>> they don't define the
>> >> > sawtooth wave.
>> >
>> > I tend to call it a sawtooth when it ramps downward,
>> and a ramp when it
>> > ramps upward.  However, it seems to me that we should
>> reserve the term
>> > "sawtooth" for either upward or downward ramps which
>> are linear; i.e., those
>> > which are generated by a carefully designed VCO
>> feeding a fixed current to
>> > an integrator with one end of the cap pinned to
>> virtual ground, and which
>> > can be counted upon to contain both even and odd
>> harmonics with amplitudes
>> > inverse to their harmonic number.  At least, in synth
>> circles, I think we
>> > should make this distinction.
>> >
>> > Waveforms derived from relaxation oscillators
>> definitely do not fit the
>> > bill, and therefore should not be called "sawtooth",
>> any more than some
>> > random "rounded" waveform should be called "sine".
>> >
>> >
>>
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