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2015-07-21 by vladoman@gmail.com
Hello,
looking at the triangle wave of the 110-2, there is a glitch at the end which gives it quite an audible "buzz" on top of the triangle sound.
is there a way to calibrate that away somehow?
Regards,
Vladimir
2015-07-21 by Neil Kagan
It's the same on the 110-1. The VCO core is a sawtooth I believe, and uses wave shaping to get the other shapes. The old version had a sine that had more distortion which is why I think it might have been removed. Your best bet would be to filter it out. Neil Sent from my iPhone
> On 21 Jul 2015, at 06:01, vladoman@gmail.com [Doepfer_a100] <Doepfer_a100@yahoogroups.com> wrote: > > Hello, > > > > looking at the triangle wave of the 110-2, there is a glitch at the end which gives it quite an audible "buzz" on top of the triangle sound. > > > > IMG_20150709_174337.jpg > > > IMG_20150709_174337.jpg > View on drive.google.com > Preview by Yahoo > > > is there a way to calibrate that away somehow? > > > > Regards, > > > > Vladimir > > > > > >
2015-07-21 by Neil Kagan
The A-111-1 is a triangle core if that helps Sent from my iPhone
> On 21 Jul 2015, at 07:29, Neil Kagan blinkenlicht@yahoo.com [Doepfer_a100] <Doepfer_a100@yahoogroups.com> wrote: > > It's the same on the 110-1. The VCO core is a sawtooth I believe, and uses wave shaping to get the other shapes. The old version had a sine that had more distortion which is why I think it might have been removed. Your best bet would be to filter it out. > > Neil > > Sent from my iPhone > >> On 21 Jul 2015, at 06:01, vladoman@gmail.com [Doepfer_a100] <Doepfer_a100@yahoogroups.com> wrote: >> >> >> Hello, >> >> >> >> looking at the triangle wave of the 110-2, there is a glitch at the end which gives it quite an audible "buzz" on top of the triangle sound. >> >> >> >> IMG_20150709_174337.jpg >> >> >> IMG_20150709_174337.jpg >> View on drive.google.com >> Preview by Yahoo >> >> >> is there a way to calibrate that away somehow? >> >> >> >> Regards, >> >> >> >> Vladimir >> > >
2015-07-21 by vladoman@gmail.com
no the 110-1 is different, on the 110-1 there is a glitch at the peak of the triangle and this one is way less audible than this glitch at the bottom of the triangle on the 110-2. see the linked picture: IMG_20150709_174337.jpg
2015-07-21 by Neil Kagan
I would think that what you are seeing is still the result of a Sawtooth being wave shaped into a triangle. I imagine Dieter will know why this is the case, in terms of how it differs from the 110-1.
> On 21 Jul 2015, at 08:34, vladoman@gmail.com [Doepfer_a100] <Doepfer_a100@yahoogroups.com> wrote: > > Hi, > > > no the 110-1 is different, on the 110-1 there is a glitch at the peak of > the triangle and this one is way less audible than this glitch at the > bottom of the triangle on the 110-2. > > see the linked picture: > > IMG_20150709_174337.jpg <https://drive.google.com/file/d/0ByXqLcOF-aBUTG1xQnR0WTNUMmM/view?usp=sharing> > > <https://drive.google.com/file/d/0ByXqLcOF-aBUTG1xQnR0WTNUMmM/view?usp=sharing> > IMG_20150709_174337.jpg <https://drive.google.com/file/d/0ByXqLcOF-aBUTG1xQnR0WTNUMmM/view?usp=sharing> > View on drive.google.com <https://drive.google.com/file/d/0ByXqLcOF-aBUTG1xQnR0WTNUMmM/view?usp=sharing> > Preview by Yahoo > > > > >
2015-07-21 by Florian Anwander
Hello, judging the time scale of the scope the VCO is running at a very high frequency (~20kHz). In this case you will see the resetpulse of the comparator/transistor circuit. You will find that at many VCOs. The most famous is the VCO of the Yamaha VCO chip: http://www.cs80.com/vco.html Florian Am 21.07.2015 um 09:34 schrieb vladoman@gmail.com [Doepfer_a100]:
> > > Hi, > > no the 110-1 is different, on the 110-1 there is a glitch at the peak of > the triangle and this one is way less audible than this glitch at the > bottom of the triangle on the 110-2. > > see the linked picture: > > IMG_20150709_174337.jpg
2015-07-21 by yahoo@doepfer.de
> Hello, > > looking at the triangle wave of the 110-2, there is a glitch at the end which gives it quite an audible "buzz" on top of > the triangle sound. > > IMG_20150709_174337.jpg > > IMG_20150709_174337.jpg > View on drive.google.com Preview by Yahoo > > is there a way to calibrate that away somehow? > > Regards, > > Vladimir In the A-110-2 the triangle is derived from the sawtooth via waveshaping (in case of the A-110-2 that's a precision rectifier which mirrors the sawtooth wave when it reaches negative values). Sorry - there is no trimming potentiometer available. As a rule you will always obtain a glitch when a triangle or sine is derived from a sawtooth. The reason is that the "reset" of the sawtooth is not infinitely fast but takes a while. In reality a sawtooth is consequently an extremely asymmetric triangle with a slow slope (the typical sawtooth slope) and a very short reset slope. This reset slope is what you see as a glitch in every triangle that is derived from a sawtooth by means of waveshaping. The only way to remove it would be a tracking filter or the usage of a triangle core based VCO like the A-111-1 (or the planned successor of the A-111-1 high end VCO, but this module is still under development). Best wishes Dieter Doepfer
2015-07-21 by Vladimir Pantelic
it happens as well at lower frequencies
Hello,
judging the time scale of the scope the VCO is running at a very high
frequency (~20kHz). In this case you will see the resetpulse of the
comparator/transistor circuit.
You will find that at many VCOs. The most famous is the VCO of the
Yamaha VCO chip:
http://www.cs80.com/vco.html
Florian
Am 21.07.2015 um 09:34 schrieb vladoman@gmail.com [Doepfer_a100]:
>
>
> Hi,
>
> no the 110-1 is different, on the 110-1 there is a glitch at the peak of
> the triangle and this one is way less audible than this glitch at the
> bottom of the triangle on the 110-2.
>
> see the linked picture:
>
> IMG_20150709_174337.jpg
2015-07-21 by Florian Anwander
Hello > it happens as well at lower frequencies Of course it does happen at lower frequencies, but it is much more visible at high frequencies and it will have a deeper impact soundwise. Florian
2015-07-21 by vladoman@gmail.com
2015-07-21 by james.husted@mac.com
ALL electronic music VCO’s have some distortion somewhere. To completely remove those distortions would raise the cost so much that people would not probably buy them. Also it is hard to remove some distortions over the total range of the VCO too. The most typical distortion is overshoot at sudden transitions of the waveform. There is also sagging on sawtooth waves, square waves that are not symmetrical or don’t have flat tops, things like that. These distortions give the VCO it’s unique sound compared to other VCO’s. Otherwise a perfect saw would sound exactly the same as any other perfect saw. When people say a certain VCO is fatter sounding or smother sounding or any other descriptor that is used to differentiate one VCO from another, theses distortions are what they are truly talking about. ANY perfectly executed waveform will have the same harmonice, hence the same SOUND and any other perfectly executed waveform of the same shape. -James James Husted, Designer, Synthwerks LLC • www.synthwerks.com • james@synthwerks.com • info@synthwerks.com
> On Jul 21, 2015, at 2:24 AM, vladoman@gmail.com [Doepfer_a100] <Doepfer_a100@yahoogroups.com> wrote: > > > > Thanks for the explanation. > > > > >
2015-07-21 by Isolde Isobelle
ALL electronic music VCO’s have some distortion somewhere. To completely remove those distortions would raise the cost so much that people would not probably buy them. Also it is hard to remove some distortions over the total range of the VCO too. The most typical distortion is overshoot at sudden transitions of the waveform. There is also sagging on sawtooth waves, square waves that are not symmetrical or don’t have flat tops, things like that.These distortions give the VCO it’s unique sound compared to other VCO’s. Otherwise a perfect saw would sound exactly the same as any other perfect saw. When people say a certain VCO is fatter sounding or smother sounding or any other descriptor that is used to differentiate one VCO from another, theses distortions are what they are truly talking about. ANY perfectly executed waveform will have the same harmonice, hence the same SOUND and any other perfectly executed waveform of the same shape.-JamesJames Husted, Designer, Synthwerks LLC • www.synthwerks.com • james@synthwerks.com • info@synthwerks.comOn Jul 21, 2015, at 2:24 AM, vladoman@gmail.com [Doepfer_a100] <Doepfer_a100@yahoogroups.com> wrote:
Thanks for the explanation.
2015-07-21 by Florian Anwander
Otherwise a perfect saw would sound exactly the same as any other perfect saw. When people say a certain VCO is fatter sounding or smother sounding or any other descriptor that is used to differentiate one VCO from another, theses distortions are what they are truly talking about. ANY perfectly executed waveform will have the same harmonice, hence the same SOUND and any other perfectly executed waveform of the same shape.I own a mutable instruments braids, and I have to admit, that it is great to have perfect saw, because also the perfect VCO differs from the non perfect VCO by its waveform.