[sdiy] Seeking for help...

[Rouslan Placella]

Hi Harry,
Sorry bothering you, as you can see I'm just a novice.....
What do you mean by filtering the unwanted harmonics. Using a VCF? Some kind
of waveshaper? Or something else?

Thanks again, Rouslan.


>-- Messaggio Originale --
>Date: Wed, 2 Feb 2005 07:00:45 -0800 (PST)
>From: Harry Bissell Jr <harrybissell at prodigy.net>
>Subject: Re: [sdiy] Seeking for help...
>To: Rouslan Placella <r.placella at tiscali.it>, synth-diy at dropmix.xs4all.nl
>
>
>Hi Rouslan
>
>the technique you are describing is a form of additive
>synthesis. You can make any waveshape that way but if
>you use analog VCOs it is very hard.
>
>The more common way is subtractive synthesis, start
>with an easily generated wave (sawtooth, square, etc)
>then filter the wave to remove the unwanted harmonics.
>
>Because the high frequency energy usually decreases
>over time, you can lower the filter frequency to
>simulate that as well.
>
>If you are trying to simulate bass guitar... the
>harmonics are not perfect multiples of the fundamental
>frequency. They will be progressively sharp as you
>increase in frequency.  In that case you might want to
>use multiple oscillators...but with some circuit that
>starts them all in phase.
>
>H^) harry
>
>
>
>--- Rouslan Placella <r.placella at tiscali.it> wrote:
>
>> Hi lads,
>> I deeply apologise for the horrible drawing of the
>> waves of yesterday, I've
>> attached a picture of what I actully meant.
>> 
>> (hope can attach files to the e-mail, (I'm new to
>> mailing lists))
>> 
>> Thanks to everybody!!!
>> 
>> <I'm trying to build a bass synth. And I found out
>> that to generate a suitable
>> <
>> < wave for this I need 3 VCO. The first one should
>> do a regular sin wave,
>> but
>> <the other two should do something like the figure
>> B(at twice the frequency).
>> <
>> <I still didn't come up with anything...
>> <Can anybody help me out?
>> <
>> <Thanks to everyone in advance, Rouslan.
>


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