[microsound] "No Input Mixing Board"

[Justin Glenn Smith]

Feedback causes nonlinear behaviours in qauntized signals as well. The main problem ends up being the control rate / buffer size which sets a minimum duration on feedback (unless the whole thing is coded in C as one unit generator / object). Also you will probably want to liberally sprinkle weak low pass filters all over the circuit (all analog components have some low pass property, however subtle). On the implementation side, a first order IIR filter is actually a very short delay line with feedback, so it may be worth experimenting with various configurations of interconnected IIR filters, and some extra feedback paths for good measure.

David Powers wrote:
> The problem is--you can't get true nonlinear feedback with discrete
> (binary) numbers as far as I know...
> My guess is you'd have to work pretty hard to simulate things with
> some type of nonlinear equations...
> At least I wanted to do something like this but could never figure it out.
> 
> ~David
> 
> On Tue, Dec 14, 2010 at 11:24 AM, David <dfkettle at gmail.com> wrote:
>> Has anyone ever tried to emulate the effect using just software, like
>> PureData for example? It might be fun to put together a patch that
>> does something more or less the same, although I imagine you'd get
>> different results with every model of mixing board (maybe even with
>> different units of the same model). You could start with a short
>> sample of 60 cycle hum or other noise coming from a mixing board, or
>> just synthesize it "from scratch". Anyone know of any Fourier analysis
>> of 60 cycle hum that's been done? Is it just narrow-band noise
>> centered around 60 cps?
>>
>> You'd save money on hardware, too.
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