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> Quick reading of drivers/isdn/isdn_audio.c(*) shows that it does use > fixed-point Görtzel (Goertzel in english) algorithm for detecting > tones, but it does _not_ do comparison of received overall signal > power vs. detected DTMF tone powers. > > When there is signal power outside the DTMF channels, signal should > not be detected. Also, DTMF tone powers should be roughly equal, > and exactly two tones should be present for valid detection. > > http://www.numerix-dsp.com/goertzel.html > > Adding those power tests should be fairly trivial, but I leave it > to Somebody Else... Is there a 'somebody else' (perhaps the isdn maintainer?) that have time to look at this? thanks roy -- Roy Sigurd Karlsbakk, Datavaktmester ProntoTV AS - http://www.pronto.tv/ Tel: +47 9801 3356 Computers are like air conditioners. They stop working when you open Windows. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | |||||||||
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