On Thu, Jul 25, 2002 at 10:45:27AM -0400, Paul Davis wrote: > >Hello to all, > > > >who has already done DTMF recognition with ALSA ( OSS )? > >I searched for examples in google, but I have found that > >only in TODO lists ;-(. > > > >Is this so difficult or why doesn't exist anything about that? > > its a relatively trivial FFT problem. use FFTW to analyse the signal, > then look for two predominant frequencies, and check their values > against a table. >
This is hardly an ALSA problem... linux-audio-devel maybe? I have some Matlab/Octave code to do this. I wrote it for a DSP class. I used the Goertzel algorithm. I could actually get pretty good rejection of false activation this way. Email me if you want the code. Regards, Mark Rages [EMAIL PROTECTED] ------------------------------------------------------- This sf.net email is sponsored by: Jabber - The world's fastest growing real-time communications platform! Don't just IM. Build it in! http://www.jabber.com/osdn/xim _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
