Iain Barker wrote:
Hi Devs,
I am intersted in knowing the status and quality of the echo canceller software
in the current Asterisk code. I looked through the sources and the wiki pages
http://www.voip-info.org/tiki-index.php?page=Asterisk+echo+cancellation
Looks like there are a number of different s/w ecan implementations; I also
note that newer Digium cards have ecans in hardware DSP rather than using the
host s/w.
For each of the ecan versions:
Has anyone done objective G.165 or G.168 certification testing?
Has anyone done MoS subjective (PAMS, PSQM) listener effort testing?
What is the CPU overhead for each s/w ecan channel (MIPS usage)?
None of the cancellers in * will pass any of the tests in G.168. G.165
isn't really that relevant. Cancellers don't really impact things like
PESQ much, unless they go horribly wrong. EC takes a lot of CPU power,
hence the new cards with hardware EC. How good that hardware EC is, I
have no idea.
Regards,
Steve
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