Subject: Re: [linux-audio-dev] Calculating Latency
From: jesse_AT_essej.net
Date: Thu Sep 11 2003 - 19:54:15 EEST
> >What is the formula for calculating latency in Jack? For example, I
> >start jackd with a period size of 256 and 2 periods, a sample rate of
> >44100. Using a mic input and FreqTweak, that's pretty close to
> >inaudible latency to my ears. How do I calculate the actual ms value
> >of that?
>
> output latency = period size * nperiods
> input latency = period size
> through latency = output latency
> jitter = period size
>
> if period size = 256, nperiods = 2 and SR = 44100, then the output
> latency is 256/44100 * 2 = about 11 milliseconds.
Freqtweak will also be adding to the latency depending on the FFT
size (and overlap) you choose. Switch to a large FFT and you'll
definitely start hearing it. You can bypass one channel and hear
the effect in comparison with the unbypassed channel.
jlc
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