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[Linphone-developers] ec_delay / ec_tail_len relationship

From: Guillermo Rodriguez Garcia
Subject: [Linphone-developers] ec_delay / ec_tail_len relationship
Date: Thu, 1 Feb 2018 11:56:44 +0100

Hello all,

I am fine tuning the echo canceller configuration in linphone for a custom hardware board. I am trying to use the test_ecc tool to estimate the hardware delay, but have found that the measured delay depends on the ec_tail_len value. If ec_tail_len is increased, the measured ec_delay decreases, and vice-versa:

Indeed, the documentation ( states the following: 

#Use this when you have a fixed latency in the sound hardware.
#This allows to reduce the tail length of the echo canceller, which speeds up convergence
#and reduces complexity of computations.

#Tail length of echo canceller in milliseconds.
#Ideally it should be no more than the expected duration of the echo.

So: What is the recommended process to come with optimal values for these two parameters?

Thank you,

Guillermo Rodriguez Garcia

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