'DTMF using a PIC directly'
|> I have done DTMF decoding using just a zero-cross detector and a 20MHz
> PIC. Depending upon whether tone generation is required as well, the
> routine uses about 40-70% CPU time [it has two parts: an interrupt routine
> that uses about 40-50% CPU, and a calculation routine that needs to be
> called about 60 times/sec].
> Unfortunately, because I developed the routine for my employer I cannot
> release it on the net, at least not presently. On the other hand, I will
> say that it is possible to do a good job of detecting DTMF or other such
> tones, using a PIC, even in the presence of other audio (such as dial
> tone). My routine looks for eight tones simultaneously, and is selectable
> between two groups of eight (one set up for DTMF, one for call-progress
> and special tones).
Would you say your design worked better than an off the shelf DTMF chip?
WFT Electronics frii.com wfthttp://www.frii.com/~wft
Gus Calabrese 303 321-1119......voicemail
Lola Montes 1799 Uinta Street Denver, CO 80220
EMERGENCY: 791 High Street Estes Park, CO 80517
if no success with frii.com, try .... wftbigfoot.comwft
More... (looser matching)
- Last day of these posts
- In 1997
, 1998 only
- New search...