[sdiy] Mathematics of flanging

[Richie Burnett]

Yes, it is true that digital delays are not limited to whole (integer) numbers of samples. There are many DSP processes that rely on being able to calculate the value of a signal "between the sample points" using various interpolation techniques.

Indeed Chorusing and Flanging are two effects that benefit hugely from properly implemented fractional-sample digital delays. (Hint: Linear interpolation usually doesn't cut it.)

-Richie,



---- Gordonjcp wrote ----

>On Sat, Mar 05, 2022 at 01:52:40PM -0500, Michael E Caloroso via Synth-diy wrote:
>> 
>> Digital delays aren't ideal because you can't get deep enough modulation,
>> the modulation LFO in digital domain is often too discrete at low sweep
>> rates, and you need ~0.3ms delay (few digital delays offer short delay
>> times). 
>
>I think you're going to have to clarify that a little.  You can make digital delays that go right down to a single sample and up to many many hours, and modulate them with absolutely no apparent stepping over that entire range.
>
>-- 
>Gordonjcp
>
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