[music-dsp] delay estimation

Roman Katzer labmeister at gmx.de
Sat Feb 5 17:15:16 EST 2005


On Thursday, February 3, 2005, 09:15:30, Maciej Bartkowiak wrote:

> The aim is to find a delay that aproximates the system so that the diffenece
> between output and delayed input has minimum energy.

Group delay is -d(phase)/d(omega). For a constant delay, this would be a
constant, the phase would describe a straight line whose angle with the
omega axis corresponds to the delay. So, phase = -delay * omega.

Try to find the best match by subtracting this from the phase you found
via FFT. Minimal error energy cannot be found without looking at spectral
energy density (how much energy per frequency bin).

Regards,
Roman


-- 
One's destination is never a place, but rather a new way of looking at
things.  -- Henry Miller





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