Date: Tue, 22 May 2007 22:53:23 +0200 From: Hans Petter Selasky <hselasky@c2i.net> To: freebsd-isdn@freebsd.org Subject: New functionality in ISDN4BSD Message-ID: <200705222253.23900.hselasky@c2i.net>
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Hi all! I've just added some new interesting functionality to my I4B, and that is the possibility to dump the echo cancel FIR filter during live conversations. Information on how to do the dump is described in "man isdnconfig". See "dump_ec". For example you can make a script like this: #!/bin/sh while true do isdnconfig -u 63 -c 1 dump_ec sleep 1 done And then pipe the output to "octave" or "matlab" for example: ./live_trace.sh | octave Here is a snapshot: http://www.turbocat.net/~hselasky/isdn4bsd/echo_cancel_live.png The FIR filter reveals very much information about the characteristics of the phone line. In the snapshot above you will see two peaks, hence two speakers are involved. Have fun! --HPS http://www.turbocat.net/~hselasky/isdn4bsd
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