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

[cheater cheater]

> 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".
>
>