I gotta take issue with your comments that a HWEC is just software running on a DSP. In the case of Octasic, it's an ASIC. How it does EC is VERY different because.....it's done completely in hardware, not firmware loaded into memory and run on a specialized CPU! Yes, the ASIC does contain an DSP but it is customized for EC. You cannot think of it as a CPU.
-----Original Message----- From: Nic Bellamy [mailto:[EMAIL PROTECTED] Sent: Tuesday, February 13, 2007 5:43 PM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [asterisk-users] The High Performance Echo Canceller (HPEC) shadowym wrote: > Interesting, > > Is this just a more advanced software echo canceller or software with > hardware hooks or software with hardware assisted processing? > A more advanced software canceller (there's no magical thing that makes "hardware" echo cancellers better, it's still software, but it's running on a DSP so it has more grunt available to it). It's licensed from Adaptive Digital Technologies - G.168 compliant, and supports up to 1024 taps (128ms) of tail coverage. Comes as a binary blob, but such is life. > How would it compare to a true hardware echo canceller like the one > Sangoma uses. Besides the extra CPU cycles required. > Quite comparable - not sure if Octasic (as used by Sangoma and the latest Digium cards) or ADT would win in a shootout, but they're both in the same quality class. The main issue is going to be CPU usage - getting this going at 1024 taps on a full T1/E1 span would likely require two fast CPUs with the interrupts distributed evenly between them... and even then, *shrug* Cheers, Nic. > -----Original Message----- > From: Nic Bellamy [mailto:[EMAIL PROTECTED] > Sent: Tuesday, February 13, 2007 12:41 PM > To: Asterisk Users Mailing List - Non-Commercial Discussion > Subject: Re: [asterisk-users] The High Performance Echo Canceller > (HPEC) > > Larry Shields wrote: > >> I recently read about the following new technologies from Digium. >> Has anyone tried the new HPEC or knows when it will be available? >> > It's out now, and I've tried it - the difference between HPEC and MG2 > from trunk is stunning - in situations with bad echo where MG2 can > take ten or more seconds to converge to a reasonable degree, HPEC does > it in perhaps 300ms - converging on my intake of breath before I say > "hello", and absolutely no echo after that unless I purposefully go > out of my way to screw it up (whistling/blowing into the handpiece for > instance - even then, the malfunction is minimal). > > You can now buy it from the Digium website (US$10 per channel), or if > you have an in-warranty Digium card, email through the serial numbers > to Digium support and they'll give you a key (this is what I did). > > You'll need Zaptel 1.2.13 to make it go. > > It does take quite a bit of CPU though - perhaps 70% more compared to > MG2-trunk for the same number of taps from my rough measurements. > > Cheers, > Nic. > > -- > Nic Bellamy, > Head Of Engineering, Vadacom Ltd - http://www.vadacom.co.nz/ > > > > _______________________________________________ > --Bandwidth and Colocation provided by Easynews.com -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > -- Nic Bellamy, Head Of Engineering, Vadacom Ltd - http://www.vadacom.co.nz/ _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
