Messages in this thread | | | From | Wolfgang Fritz <> | Subject | Re: [Asterisk] DTMF noise | Date | Wed, 08 Jan 2003 17:30:54 +0100 |
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Wolfgang Fritz wrote:
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> > There exists a long text about DTMF detection somewhere on the net (I > may have the link in the office but I'm on vacation now). What I > remember is that a "correct" DTMF detection requires much more computing > power as the present i4l implementation needs (much longer audio samples > for the goertzel filter, a larger number of frequencies to check) and a > standard test procedure with a lot of test cases which are not available > to mortal humans (audio tapes from Bellcore IIRC) >
The link below is not the text I mean above but shows an approach which is similar to the present i4l implementation but has some improvements which may be good enough for us.
http://www.mitsubishichips.com/press/dtmf0199e.pdf
> Wolfgang > > [cut]
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