[sdiy] Envelope attack smoothing for drum question

Chromatest J. Pantsmaker chromatest at azburners.org
Sat Aug 22 00:21:47 CEST 2020


would a 9ms delay be any worse than a professional human drummer?

On Fri, Aug 21, 2020 at 2:28 PM Mattias Rickardsson <mr at analogue.org> wrote:

> Hi Jason,
>
> On Fri, 21 Aug 2020 at 22:39, Jason Nanna <jasonnanna at gmail.com> wrote:
>
>> Would delaying the trigger until an oscillator zero-crossing be a simpler
>> way to synchronize?  Assuming a bipolar triangle, I don't think it matters
>> whether it's rising or falling.
>>
>
> It would probably work, but would introduce undefined delays instead. For
> a boomy 55 Hz bass drum there could be anywhere between 0 and 9 ms delay,
> which I'd expect to be audible and untight...?
>
> /mr
>
>
>
>>
>> On Fri, Aug 21, 2020 at 3:33 PM Jacob Watters <jacobwatters at gmail.com>
>> wrote:
>>
>>> Right. The linearizing is for noise, but the trimpot is the important
>>> part for thumping. I added the diode part to my suggestion because it is a
>>> good practice that I often see left out.
>>>
>>> *Jacob Watters*
>>> JacobWatters.com <http://jacobwatters.com/>
>>> Tel: 226-886-3526
>>>
>>>
>>> On Fri, Aug 21, 2020 at 3:52 PM Dakota Melin <dksynth at gmail.com> wrote:
>>>
>>>> I think Jacob might be pointing out that if your VCA itself has DC
>>>> offset problems that’ll thump as well.
>>>>
>>>> On Fri, Aug 21, 2020 at 3:41 PM Tom Wiltshire <tom at electricdruid.net>
>>>> wrote:
>>>>
>>>>> How does use of the linearising diodes hep with the offset click?
>>>>>
>>>>> I agree about eliminating the offset as a source of the click, since
>>>>> if the VCA thumps, it doesn’t;t matter what signal you feed it, or even if
>>>>> you feed it no signal at all, you’ll still hear a click, but I don’t see
>>>>> what the linearising diodes have to do with that.
>>>>>
>>>>> Tom
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On 21 Aug 2020, at 20:25, Jacob Watters <jacobwatters at gmail.com>
>>>>> wrote:
>>>>>
>>>>> You mentioned an OTA based VCA. I have experienced some clicking with
>>>>> these in the past. Use a linearizing diode and calibrate the 1k trimpot (
>>>>> https://i.stack.imgur.com/5drhW.jpg). That will rule out the VCA as
>>>>> the source of the click.
>>>>>
>>>>> *Jacob Watters*
>>>>> JacobWatters.com <http://jacobwatters.com/>
>>>>> Tel: 226-886-3526
>>>>>
>>>>>
>>>>> On Wed, Aug 19, 2020 at 5:42 PM Didier Leplae via Synth-diy <
>>>>> synth-diy at synth-diy.org> wrote:
>>>>>
>>>>>> We are working on an analog drum module that uses a simple envelope
>>>>>> created from a trigger to control the amplitude of a triangle oscillator
>>>>>> with a basic OTA based VCA.
>>>>>>
>>>>>> We are having a problem with a slight clicking sound at the beginning
>>>>>> of many of the drum hits. We think this is because the attack of our
>>>>>> envelope is so sharp that the beginning of our drum hit looks like a
>>>>>> straight jump from 0V to wherever the triangle wave happens to fall.
>>>>>> Therefore the click is somewhat random in that it doesn't occur when the
>>>>>> triangle happens to be low at the time of attack.
>>>>>>
>>>>>> Can anyone suggest a simple way to deal with this, like adding a
>>>>>> slight bit of attack time to the envelope? How could this be done without
>>>>>> adding too many parts?
>>>>>>
>>>>>> Thanks,
>>>>>>
>>>>>> Didier
>>>>>> _______________________________________________
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>>>>>>
>>>>>
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