[sdiy] Axoloti

[Martin Fay]

Feedback delay can be mitigated using iterative methods, but at the cost of much more computation. See the relatively recent ZDFF filters for application of this.

Martin

Sent from my iPhone

> On 13 Dec 2015, at 14:04, Johannes Taelman <johannes.taelman at gmail.com> wrote:
> 
>> On Sat, Dec 12, 2015 at 10:10 PM, Ian Fritz <ijfritz at comcast.net> wrote:
>> However, when I compare to the capabilities of my analog modular system it seems to come up short in several important areas.  (With the understanding that I probably don't know all Axoloti's features, since the list of primitives is a bit vague.)
> 
> You could install the patcher and explore the object library.
>  
>> 
>> Basically, I would say that what would be helpful for my interests are primitives that emulate all the functions available in an analog computer. 
> 
> Analog versus digital has a different nature: bandwidth is limited to half the sample rate, aliasing is a concern where non-linearity is involved, and feedback unavoidably implies delay.
>  
>> Useful additions would include
>> 
>> Integrator
>> Differentiator
>> Comparitor (including output "trigger" signals)
>> Window comparator
>> Sample and Hold
>> Track and Hold
>> Diode nonlinear function
>> Differential equation solver
> 
> For example a full wave rectifier could be implemented as a sample-by-sample function (and there is an object for that), however this can sound ugly, aliased. Some objects (infinite gain, sample and hold, rectifiers) offer a more complex approach to generate a less-aliased output, but at the cost of more load and also response time. The increased response time may be problematic if used in a feedback structure. But that is not an easy problem to solve without compromising real time performance.
> 
>>   Hopefully most of these could be implemented with a good set of primitives. Now that would be fun!
> 
>  Axoloti is an open and expandable framework.
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