[linux-audio-dev] Calculating Latency

[jesse at essej.net]

 > >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