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

[Scott Nordlund]

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 	<003001ca5bc6$cd7109b0$0201a8c0 at TIM>

 	<E69C3D7735624469AD03BF4DEFEBF182 at cruncher2> <m2ljina1f2.fsf at till.com>
 

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Actually=2C I believe it is exponential.=A0 If you think about=2C for examp=
le=2C a=20
capacitor charging through a resistor in a relaxation oscillator=2C or a=20
standard analog envelope generator=2C that's exactly how it looks.=A0 It's=
=20
exponential decay.

> Date: Wed=2C 4 Nov 2009 20:13:54 +0000
> Subject: Re: [sdiy] They aren't sawtooths=2C they're ramps
> From: cheater00 at gmail.com
> To: synth-diy at dropmix.xs4all.nl
>=20
>>  > http://www.eng.cam.ac.uk/DesignOffice/mdp/electric_web/Exper/05263.pn=
g
>>
>> This drawing is not correct.
>=20
> Hmm.. hadn't looked at the drawing earlier. It is indeed incorrect=2C
> the 'ramp' part of the wave is logarithmic=2C not exponential. Seconded=
=2C
> that drawing is definitely wrong.
>=20
>> "Ramp" refers to the ramping part of the sawtooth wave=2C 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=3B a wave that starts
>> low=2C ramps up=2C holds there for a bit=2C and then resets.
>=20
> Such as a ramp generator=2C which is like a simplified attack-hold
> envelope generator. Sometimes has delay before the attack begins. One
> classical example where it's used is delayed vibrato.
>=20
> On Tue=2C Nov 3=2C 2009 at 18:49=2C Donald Tillman <don at till.com> wrote:
>> =A0> From: Electronic Battle <electronicbattle at googlemail.com>
>> =A0> Date: Mon=2C 2 Nov 2009 17:22:07 -0000
>> =A0>
>> =A0> Please can someone talk about the difference between sawtooth and
>> =A0> ramp waveforms and whether they sound different?
>>
>> You should introduce yourself. =A0I haven't seen posts from you before=
=2C
>> and your email header is cryptic.
>>
>> =A0> However=2C original relaxation oscillators generated exponential
>> =A0> rises and falls - these are the true sawtooths.
>> =A0>
>> =A0> Have a look here:
>> =A0> http://www.eng.cam.ac.uk/DesignOffice/mdp/electric_web/Exper/05263.=
png
>>
>> This drawing is not correct.
>>
>> The "Sawtooth Wave" really is a linear ramp and reset. =A0Check out the
>> Wikipedia page. =A0Check out other references. =A0Check out an actual sa=
w.
>>
>> "Ramp" refers to the ramping part of the sawtooth wave=2C but could also
>> refer to waveforms where the ramp is an important part of a waveform
>> that's not really a sawtooth wave. =A0For example=3B a wave that starts
>> low=2C ramps up=2C holds there for a bit=2C and then resets.
>>
>> Relaxation oscillators are what they are=2C they don't define the
>> sawtooth wave.
>>
>> =A0-- Don
>>
>> --
>> Don Tillman
>> Palo Alto=2C California
>> don at till.com
>> http://www.till.com
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>
>=20
> Amos..
>=20
> On Tue=2C Nov 3=2C 2009 at 14:19=2C Amos <controlvoltage at gmail.com> wrote=
:
>> On Tue=2C Nov 3=2C 2009 at 7:59 AM=2C cheater cheater <cheater00 at gmail.c=
om> wrote:
>>>
>>> Linear stages in synths are [IMO] boring.
>>
>> fixed.  Come on=2C this is such a sweeping generality... "linear stages"=
 (and
>> that covers a lot of territory) can be used in infinitely non-boring way=
s by
>> non-boring synthesists... boredom is experienced subjectively in any cas=
e=2C
>> it's not an intrinsic property of any synth circuit. :-)
>>
>=20
> I'm sure nobody felt brain-washed or imposed upon by that one=2C
> half-joking=2C statement. Please keep nonconstructive philosophy off
> list. Who else's opinion would I be expressing if not my own? Do we
> really have to prefix everything with 'in my opinion' when something
> is clearly a matter of opinion? Do you need your hand held so that you
> can notice which statements are opinions and which are mathematically
> provable laws of nature?
>=20
> D.
>=20
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 		 	   		 =20
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