[music-dsp] who else needs a fractional delay.

Ian Esten ian at ianesten.com
Fri Nov 19 16:34:39 EST 2010


A Leslie emulation (or effect similar to that) might well need one,
depending on how you modeled it. Same statement applies for tape delay
style effects too. As you say, I bet there's plenty of others, too.
Anyone else got any other effects to add to the list?

Ian


On Fri, Nov 19, 2010 at 1:07 PM, robert bristow-johnson
<rbj at audioimagination.com> wrote:
>
> On Nov 19, 2010, at 3:42 PM, Alan Wolfe wrote:
>
>> i fear to post a question being the OP of this huge 100+ message thread
>> but...
>>
>> it was mentioned here and in a previous email that for digital
>> flangers you want to interpolate between samples for best results.
>>
>> Would you want to do this for all sampling digital effects such as
>> delay and reverb too?  Or is flanger special because it's dealing with
>> usually a small offset in the samples, so interpolation becomes more
>> important to fake a higher resolution signal?
>
> the issue is if it's a moving or modulateable delay.
>
> there is a basic audio process called a "precision delay".  sometimes it's
> used for time alignment.  flangers, pitch shifters, chorus, sample rate
> converters (upsamplers) would all need to get in between the original
> samples.
>
> a reasonably *simple* reverb would likely not have to because whether it's
> the Schroeder APF/comb or the FDN (feedback delay network) kind, the delays
> can be set to integer values and the exact delay amount is not critical.
>  some reverbs have a delay that moves very slowly to prevent it locking down
> on any particular room mode, that moving delay might need interpolation of
> samples.
>
> i can't think of another effect, offhand, that would definitely need a
> fractional delay filter in it, but i am sure they exist.
>
> --
>
> r b-j                  rbj at audioimagination.com
>
> "Imagination is more important than knowledge."
>
>
>
>
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