SV: Re: SV: Re: [sdiy] Buchla osc , Tri cores skew!

[harry bissell]

Although it would be strange...we could S/H the VCO CV input
synchronously with each triangle cycle. That would eliminate any
slew effects.  MIGHTY hard-core to be bothered. I bet during a
sweep less than audio rate you cannot hear the distortion anyway
(I think it will be masked by your ear paying attention to the more
interesting FM  :^)

H^) harry

Ken Stone wrote:
>> --- Ken Stone <sasami at hotkey.net.au> skrev:
>>
>>     
>>> While the frequency is stable, the waveform should be symetrical. During a
>>> sweep, it CANNOT be symetrical. For an analogy, think Dopler shift.
>>>       
>> I think you havent understand the initial issues of the question.
>>     
>
> No. You miss understand my answer. Dopler was an analogy, not an explanation.
>
>   
>> At any instance of frequency change the wave is supposed to
>> be symetrical, ie the rate of charging (upramp) and disscharge
>> (downramp) is equal. Should be anyway, if its not, it skews, if it skews
>> one ramp is shorter then the other wich results in a lasy saw wave,
>> i dont think that has anything to do with doppler effects.
>> The effect produced if large is just a wierd type of PM! 
>>     
>
> The problem here is that "an instance of frequency change" doesn't exist, or
> if it does, it is infintesimally short.
> During a sweep - i.e. frequency being affected by a constantly changing
> control voltage, each successive part of the waveform will be under the
> effect of a slightly different voltage. There is no way for the up and down
> ramps to be clamped as symetrical pairs. In fact, if the frequnecy is low
> enough and the sweep voltage fast enough, the "straight" segments of the
> triangle wave will become noticably curved.
> Ken
>
> _______________________________________________________________________
> Ken Stone   sasami at hotkey.net.au or sasami at cgs.synth.net
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