[sdiy] Patchable polyphonic synth with FM or AM transmission idea

Brian Willoughby brianw at audiobanshee.com
Sat Apr 27 05:19:36 CEST 2019

Thanks for the link.

What sort of actual latency times are we talking about?

A quick search of the internets gave me the impression that group delay can be 1 ms for even simple filters at certain frequencies. I’m curious to know more about audio filters in particular, such as the worst case group delay “latency” for any sort of practical filter that would be used in a synthesizer. Is 1 ms common? Rare? Is it small compared to what’s possible?


On Jan 4, 2019, at 2:29 PM, mskala at ansuz.sooke.bc.ca wrote:
> On Thu, 3 Jan 2019, cheater00 cheater00 wrote:
>> - compared to digital: FM transmission has no delay (not even 1ms),
> Common misconception.  Anything that is frequency-selective, like the
> filters needed to split the channels in an FM receiver, necessarily has a
> group delay resulting in "latency."  Using analog techniques to do it
> doesn't magically allow you to break the laws of information theory; and
> although you can reduce the group delay to be small enough not to be a
> problem, the same can be said of digital and you can never reduce it to
> *zero*.  I covered this a bit in my Web log here:
>   https://northcoastsynthesis.com/news/frequency-latency-and-uncertainty
> -- 
> Matthew Skala

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