Summary:ASTERISK-00740: [patch] Generation of tones that have one tone amplitude modulated by another
Reporter:Steve Davies . (stevedavies)Labels:
Date Opened:2004-01-05 07:26:15.000-0600Date Closed:2008-01-15 14:39:48.000-0600
Versions:Frequency of
Environment:Attachments:( 0) asterisk-patch-sld-20040105-modulatedindications.patch
Description:Currently Asterisk's tone generator can generate tones consisting of two tones added together.

But some countries use tones that consist of one higher frequency tone amplitude modulated with a second lower frequency.

Examples are Australia where ringing is 400Hz modulated with a 33Hz "warble".  In Australia, also, dialtone is 425Hz modulated with 25Hz.

South Africa uses similar (though not identical) tones.

This patch extends the "freq1+freq2" syntax used in indications.conf and elsewhere to mean "mix the two tones" with "freq1*freq2" to mean modulate the one with the other.  + and * map well to the actual arithmetical operations.
Comments:By: Olle Johansson (oej) 2004-01-06 15:50:04.000-0600

Move to category "configuration error"

By: Malcolm Davenport (mdavenport) 2004-01-07 19:33:50.000-0600

Hi Steve.  Can we get a disclaimer for this?

By: Malcolm Davenport (mdavenport) 2004-01-08 10:06:40.000-0600

Added to CVS.

By: Digium Subversion (svnbot) 2008-01-15 14:39:48.000-0600

Repository: asterisk
Revision: 1902

U   trunk/indications.c

r1902 | malcolmd | 2008-01-15 14:39:47 -0600 (Tue, 15 Jan 2008) | 2 lines

Fix to generate tones having one amplitude modulated by another: Bug ASTERISK-740