[AG-TECH] Echo Cancellation

[Markus Buchhorn]

At 08:24 5/03/2004 -0600, George Estes wrote:
>  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), who also did some large-scale projects around Australia and is a good geek at heart :-). He looked into both of them in a lot of detail, and I've asked him to write up his reasoning. I'm not an audio specialist, so don't want to misrepresent things. 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 don't know if the XAP800 has been enhanced since then.

>ps.  The last time I used the EF2280 I didn't think the software interface was very well developed, compared to Gware for the XAP800.

This is hard to quantify, we haven't used the gware software. The current control software we are using on the ef2280 looks very good - there are way too many things to twiddle :-), on the input, the output and through the processing pipelines and matrix, plus programming possibilities on the digital I/O channels (which we haven't used yet). I guess it depends on what you are looking for, and how much the user knows about audio systems. I tend to leave most things to the engineer to twiddle, but know enough to tinker with levels and muting devices if I have to (which is rare). It also doesn't drive the cpu to 100%, which gware at one stage "appeared" to do a lot (I think it was decided it was just a busy poll loop?).

We don't get a telephone gateway with the ef2280, but we (will) have a separate approach to that (since we have a campus full of IP telephony and more than enough gateways). 

If I get something useful out of the engineer I will pass it on.

Cheers,
        Markus


Markus Buchhorn, ANU Internet Futures Group,       |Ph: +61 2 61258810
Markus.Buchhorn at anu.edu.au, mail: Bldg #108 CS&IT  |Fx: +61 2 61259805
Australian National University, Canberra 0200 Aust.|Mob: 0417 281429