Sign in

username:

password:



Not a member?

Search echocancel



Search tips

Subscribe to echocancel



echocancel by Keywords

AEC | Double Talk | ERLE | G.168 | LEC | NLMS

Discussion Groups

Discussion Groups | Echo Cancellation | Guard tone & echo cancellers

Technical discussions about echo cancellation and adaptive filtering in general.

  

Post a new Thread

Guard tone & echo cancellers - joeborg123 - Jul 20 19:33:00 2005



Hi all.
Does the guard tone (1800Hz) sent by a v.22bis modem have anything to
do with disabling echo cancellers?

A convincing answer from a TDK datasheet is that "The guard tone is
used with V.22 & V.22bis modes to prevent the high-band data signal
from interfering with the operation of billing apparatus in certain
countries (where in-band signalling is used)."

I would appreciate any comments.

Best regards,
Brian E. Cauchi
http://3amSystems.com



(You need to be a member of echocancel -- send a blank email to echocancel-subscribe@yahoogroups.com )