[AG-TECH] Echo Cancellation
shudo at ni.aist.go.jp
shudo at ni.aist.go.jp
Sun Mar 7 20:06:20 CST 2004
Markus and all,
> > Just wondering what your analysis involved and what results you saw? I have used both, but never really tried to compare the two.
>
> We had an acoustic engineer work with us on our first 3 nodes (and others),
> But basically it was things like larger buffers, faster CPU, more complex filtering capabilities, more flexible multi-pathing, complex digital I/O - and at about 30-50% less cost (he wasn't the supplier ;-) ).
I have a comparing table of Polycom and ClearOne products.
The table has many rows and significant and easy-to-understand items
are as follows:
tail time (maxmum latency the product handles)
Polycom EF2210/2211 270 ms
Polycom EF2241 270 ms
Polycom EF2280 270 ms
ClearOne XAP800 128 ms
ClearOne XAP400 128 ms
convergence time
Polycom EF2210/2211 40 dB/sec
Polycom EF2241 40 dB/sec
Polycom EF2280 40 dB/sec
ClearOne XAP800 30 dB/sec
ClearOne XAP400 30 dB/sec
I got this table from a reseller of Polycom products, so it should be
favorable to Polycom. But I am sure those are different somewhat.
We need a neutral comparisons.
As I have written once, the only reason many of us bought ClearOne
(Gentner) products is reference to ClearOne products in the recipe of
AG nodes provided by ANL people.
It's desirable that the recipes are enhanced but it's hard to
gain experience on using many kinds of echo cancellers because they
are pretty expesinve.
Kazuyuki Shudo
Grid Technology Research Center
National Institute of Advanced Industrial Science and Technology (AIST)
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