[arm-allstar] tone twist

[Doug Crompton]

Eric,

 First no there is not any equalization in the code other than pre and deemphasis. It is important to have the radio and SW matched in that respect. That is if you are using deemphasized audio from the radio then you would not use it in the SW.
Generally when the pre/deemphasis is set incorrectly it effects more than one DTMF digit and the audio sounds either exceptionally bright with a lack of lows or very muddy with a lack of highs.

In generally when everything is set correctly there is no problem with DTMF detection. In my experience it has always been either a setting or radio issue. Make sure the pre/deemphasis and levels are correct. Also note that many (especially Chinese) radios have their own DTMF issues.

I suspect you already are doing this but you can view the detected DTMF digits in the Asterisk client -  asterisk -rvvv  - at the Linux prompt..  
73 Doug
WA3DSP
http://www.crompton.com/hamradio


Date: Sun, 8 Nov 2015 15:18:27 +0000
From: n7jys at yahoo.com
To: arm-allstar at hamvoip.org
Subject: [arm-allstar] tone twist

I've noticed on some of the nodes I've built, I having problem decoding the dtmf 3 key with certainradios. I can clean it up some what with a higher frequency response from the node radio but thenthe audio starts sounding kinda tinny. Just wandering if anyone else has experienced this problem.Is there a tone twist adjustment that I can experiment with to help in decoding DTMF? Thanks!   Eric (N7JYS) Marshall's Communications
_______________________________________________

arm-allstar mailing list
arm-allstar at hamvoip.org
http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar

Visit the BBB and RPi2 web page - http://hamvoip.org 		 	   		  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.hamvoip.org/pipermail/arm-allstar/attachments/20151108/aa60d122/attachment.html>