Has anyone seen this problem before? I have a server with a single X100P card. The audio level is a low, but if I raise the gain to more than -2db (Rx + Tx) it starts to oscillate in an echo test. Not at a high frequency but with a noise that is best described as a steam engine starting up. It then starts to clip and crackle. If I bring the gain down to Rx=-2.0 and Tx=0.0 or lower then it settles down but it is very very quiet. I have tried the latest CVS Head with echotraining=800 set and also complied with the aggressive echo cancelling, but nothing seems to help. Ideas welcome! Many thanks Peter Whisker This e-mail and any attachment is for authorised use by the intended recipient(s) only. It may contain proprietary material, confidential information and/or be subject to legal privilege. It should not be copied, disclosed to, retained or used by, any other party. If you are not an intended recipient then please promptly delete this e-mail and any attachment and all copies and inform the sender. Thank you.
I wonder if your issue and mine are related somehow. I have a asterisk server with 4 FXO cards in it, and when a call comes in one ZAP channel, then dials out another, I hear what could be described as a steam engine starting up. It starts off kinda slower/ quiet, then quickly (in about 2-4 seconds) completely over powers the line. The only way I could stop it was by adjusting the gains. rxgain=-8.5 txgain=4 Seemed to do the trick. As did: rxgain=-6.5 txgain=1 An rxgain of even -8.0 or -6.0 in either case would result in this "steam engine" sound. -8.5 or -6.5 would make it go away completely. I'm using a CVS checkout from yesterday, and I tried with both echotraining=800 and turning echo cancellation off completely. Neither made any difference. It would be really nice to be able to use a positive rxgain value. I haven't tried with the echo app, but using just one FXO card works fine with almost any rx/txgain value. As soon as the call utilizes two FXO card at the same time, the "steam engine" sound occurs. On Mon, 2004-06-28 at 16:26 +0100, Whisker, Peter wrote:> Has anyone seen this problem before? > > I have a server with a single X100P card. The audio level is a low, but if I > raise the gain to more than -2db (Rx + Tx) it starts to oscillate in an echo > test. Not at a high frequency but with a noise that is best described as a > steam engine starting up. It then starts to clip and crackle. If I bring the > gain down to Rx=-2.0 and Tx=0.0 or lower then it settles down but it is very > very quiet. > > I have tried the latest CVS Head with echotraining=800 set and also complied > with the aggressive echo cancelling, but nothing seems to help. > > Ideas welcome! > > Many thanks > Peter Whisker > > This e-mail and any attachment is for authorised use by the intended recipient(s) only. It may contain proprietary material, confidential information and/or be subject to legal privilege. It should not be copied, disclosed to, retained or used by, any other party. If you are not an intended recipient then please promptly delete this e-mail and any attachment and all copies and inform the sender. Thank you. > _______________________________________________ > Asterisk-Users mailing list > Asterisk-Users@lists.digium.com > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users-- Mike Benoit <ipso@snappymail.ca>
Try recompiling your zaptel package without the aggressive echo cancellation enabled. I have aggressive cancellation help before, I but I have also seen it hurt things before. Brian On Mon, 28 Jun 2004 16:26:32 +0100, Whisker, Peter <peter.whisker@logicacmg.com> wrote:> I have tried the latest CVS Head with echotraining=800 set and also complied > with the aggressive echo cancelling, but nothing seems to help. > > Ideas welcome! > > Many thanks > Peter Whisker > > This e-mail and any attachment is for authorised use by the intended recipient(s) only. It may contain proprietary material, confidential information and/or be subject to legal privilege. It should not be copied, disclosed to, retained or used by, any other party. If you are not an intended recipient then please promptly delete this e-mail and any attachment and all copies and inform the sender. Thank you. > _______________________________________________ > Asterisk-Users mailing list > Asterisk-Users@lists.digium.com > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >
Thanks for the responses. I have tried it with aggressive cancellation both on and off. I think that "on" helps a tiny bit. I'm glad that Mike Benoit as seen something similar, but of course sorry that he is suffering like me! It is worse when I have a "Phone-switch-X100P-IAX-Internet-IAX-X100P-switch-Phone" link set up. The other thing which may have helped a bit is using a large set of IAX Jitter buffers. It may be the latency which is helping though, rather than the anti-jitter aspects. Peter -----Original Message----- From: Brian McSpadden [mailto:mcspadden@gmail.com] Sent: 28 June 2004 22:57 To: asterisk-users@lists.digium.com Subject: Re: [Asterisk-Users] Zap X100P oscillation Try recompiling your zaptel package without the aggressive echo cancellation enabled. I have aggressive cancellation help before, I but I have also seen it hurt things before. Brian On Mon, 28 Jun 2004 16:26:32 +0100, Whisker, Peter <peter.whisker@logicacmg.com> wrote:> I have tried the latest CVS Head with echotraining=800 set and alsocomplied> with the aggressive echo cancelling, but nothing seems to help. > > Ideas welcome! > > Many thanks > Peter Whisker > > This e-mail and any attachment is for authorised use by the intendedrecipient(s) only. It may contain proprietary material, confidential information and/or be subject to legal privilege. It should not be copied, disclosed to, retained or used by, any other party. If you are not an intended recipient then please promptly delete this e-mail and any attachment and all copies and inform the sender. Thank you.> _______________________________________________ > Asterisk-Users mailing list > Asterisk-Users@lists.digium.com > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >_______________________________________________ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users This e-mail and any attachment is for authorised use by the intended recipient(s) only. It may contain proprietary material, confidential information and/or be subject to legal privilege. It should not be copied, disclosed to, retained or used by, any other party. If you are not an intended recipient then please promptly delete this e-mail and any attachment and all copies and inform the sender. Thank you.
I find that if I drop the RX gain too much I start to lose DTMF decoding. The Asterisk calls lose at least 3-6db end-to-end compared with a "normal" call. If I bring the gain up, the symptoms sound exactly like yours. The gain I am using is more like Rx=-2, Tx=0 but this is still quite quiet. I guess that line impedance mismatch between US and European standards accounts for some of the gain loss. Peter -----Original Message----- From: Mike Benoit [mailto:ipso@snappymail.ca] Sent: 28 June 2004 21:59 To: asterisk-users@lists.digium.com Subject: Re: [Asterisk-Users] Zap X100P oscillation I wonder if your issue and mine are related somehow. I have a asterisk server with 4 FXO cards in it, and when a call comes in one ZAP channel, then dials out another, I hear what could be described as a steam engine starting up. It starts off kinda slower/ quiet, then quickly (in about 2-4 seconds) completely over powers the line. The only way I could stop it was by adjusting the gains. rxgain=-8.5 txgain=4 Seemed to do the trick. As did: rxgain=-6.5 txgain=1 An rxgain of even -8.0 or -6.0 in either case would result in this "steam engine" sound. -8.5 or -6.5 would make it go away completely. I'm using a CVS checkout from yesterday, and I tried with both echotraining=800 and turning echo cancellation off completely. Neither made any difference. It would be really nice to be able to use a positive rxgain value. I haven't tried with the echo app, but using just one FXO card works fine with almost any rx/txgain value. As soon as the call utilizes two FXO card at the same time, the "steam engine" sound occurs. On Mon, 2004-06-28 at 16:26 +0100, Whisker, Peter wrote:> Has anyone seen this problem before? > > I have a server with a single X100P card. The audio level is a low, but ifI> raise the gain to more than -2db (Rx + Tx) it starts to oscillate in anecho> test. Not at a high frequency but with a noise that is best described as a > steam engine starting up. It then starts to clip and crackle. If I bringthe> gain down to Rx=-2.0 and Tx=0.0 or lower then it settles down but it isvery> very quiet. > > I have tried the latest CVS Head with echotraining=800 set and alsocomplied> with the aggressive echo cancelling, but nothing seems to help. > > Ideas welcome! > > Many thanks > Peter Whisker > > This e-mail and any attachment is for authorised use by the intendedrecipient(s) only. It may contain proprietary material, confidential information and/or be subject to legal privilege. It should not be copied, disclosed to, retained or used by, any other party. If you are not an intended recipient then please promptly delete this e-mail and any attachment and all copies and inform the sender. Thank you.> _______________________________________________ > Asterisk-Users mailing list > Asterisk-Users@lists.digium.com > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users-- Mike Benoit <ipso@snappymail.ca> _______________________________________________ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users This e-mail and any attachment is for authorised use by the intended recipient(s) only. It may contain proprietary material, confidential information and/or be subject to legal privilege. It should not be copied, disclosed to, retained or used by, any other party. If you are not an intended recipient then please promptly delete this e-mail and any attachment and all copies and inform the sender. Thank you.
What is particularly weird is that if I connect a call to Echo on my local server, I don;t usually get this oscillation, however if I connect it to Echo on another Asterisk server (over IAX), it does happen. The main difference will be the delay in the echo, as the software versions are within the last two days. The Echo application is the same on both, and the call should be entirely digital so there should be no gain differences and there is no echo suppression on the IAX link, so it must be the local Zap echo canceller fighting with the apparently "longer" line? Peter -----Original Message----- From: Mike Benoit [mailto:ipso@snappymail.ca] Sent: 28 June 2004 21:59 To: asterisk-users@lists.digium.com Subject: Re: [Asterisk-Users] Zap X100P oscillation I wonder if your issue and mine are related somehow. I have a asterisk server with 4 FXO cards in it, and when a call comes in one ZAP channel, then dials out another, I hear what could be described as a steam engine starting up. It starts off kinda slower/ quiet, then quickly (in about 2-4 seconds) completely over powers the line. The only way I could stop it was by adjusting the gains. rxgain=-8.5 txgain=4 Seemed to do the trick. As did: rxgain=-6.5 txgain=1 An rxgain of even -8.0 or -6.0 in either case would result in this "steam engine" sound. -8.5 or -6.5 would make it go away completely. I'm using a CVS checkout from yesterday, and I tried with both echotraining=800 and turning echo cancellation off completely. Neither made any difference. It would be really nice to be able to use a positive rxgain value. I haven't tried with the echo app, but using just one FXO card works fine with almost any rx/txgain value. As soon as the call utilizes two FXO card at the same time, the "steam engine" sound occurs. On Mon, 2004-06-28 at 16:26 +0100, Whisker, Peter wrote:> Has anyone seen this problem before? > > I have a server with a single X100P card. The audio level is a low, but ifI> raise the gain to more than -2db (Rx + Tx) it starts to oscillate in anecho> test. Not at a high frequency but with a noise that is best described as a > steam engine starting up. It then starts to clip and crackle. If I bringthe> gain down to Rx=-2.0 and Tx=0.0 or lower then it settles down but it isvery> very quiet. > > I have tried the latest CVS Head with echotraining=800 set and alsocomplied> with the aggressive echo cancelling, but nothing seems to help. > > Ideas welcome! > > Many thanks > Peter Whisker > > This e-mail and any attachment is for authorised use by the intendedrecipient(s) only. It may contain proprietary material, confidential information and/or be subject to legal privilege. It should not be copied, disclosed to, retained or used by, any other party. If you are not an intended recipient then please promptly delete this e-mail and any attachment and all copies and inform the sender. Thank you.> _______________________________________________ > Asterisk-Users mailing list > Asterisk-Users@lists.digium.com > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users-- Mike Benoit <ipso@snappymail.ca> _______________________________________________ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users This e-mail and any attachment is for authorised use by the intended recipient(s) only. It may contain proprietary material, confidential information and/or be subject to legal privilege. It should not be copied, disclosed to, retained or used by, any other party. If you are not an intended recipient then please promptly delete this e-mail and any attachment and all copies and inform the sender. Thank you. _______________________________________________ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users This e-mail and any attachment is for authorised use by the intended recipient(s) only. It may contain proprietary material, confidential information and/or be subject to legal privilege. It should not be copied, disclosed to, retained or used by, any other party. If you are not an intended recipient then please promptly delete this e-mail and any attachment and all copies and inform the sender. Thank you.