Dtmf Detection Using Goertzel Algorithm
Sai Bharadwaj B, V.Sharmila Gowri, V.Bindu Madhuri · IOSR Journal of VLSI and Signal processing · 2014
Dual-tone multi-frequency(DTMF) is an international signaling standard for telephone digits(number buttons).These signals are used in touch-tone telephones as well as many other areas.Since analog devices are rapidly changing with digital devices, digital DTMF decoders become more important.The subject of this paper is to build a dual-tone multi-frequency(DTMF) signal detector.There are many algorithms for DTMF detection, and among all of them the chosen one is Goertzel's algorithm.It is one of the simplest algorithms of all and it is very often used in practical realizations.The simulation of this algorithm is done in MATLAB and outputs of this test are given in this paper.