NDLI: In-band interference suppression in time-domain algorithms for DTMF detection

Content Provider	IEEE Xplore Digital Library
Author	Shah, S.I. Kashif, F.M. Ahmad, J. Khan, J.
Copyright Year	2004
Description	Author affiliation: Islamabad Campus, Iqra Univ., Islamabad, Pakistan (Shah, S.I.; Kashif, F.M.; Ahmad, J.)
Abstract	The use of dual-tone multi frequency (DTMF) signaling is very common in telecommunication systems such as telephone exchanges, private branch exchanges (PBXs), and call centers etc. One of the approaches of DTMF detection is based on the cycle estimation of the frequencies present in the DTMF signal. Any interference that lies in the frequency region of the DTMF signal disturbs the cycle estimation process employed by the time-domain algorithm thus degrading the detector's performance. In this article we present an easy-to-implement solution to this problem. The approach is based on enhancing the estimated DTMF signal frequencies, thereby reducing the effect of the in-band interference. The proposed solution was tested on simulated signals as well as real data recorded from a PBX. Improvement in the detection of the DTMF signals in the presence of in-band interference was observed in both cases.
Starting Page	284
Ending Page	287
File Size	530773
Page Count	4
File Format	PDF
ISBN	0780386809
DOI	10.1109/INMIC.2004.1492889
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-12-24
Publisher Place	Pakistan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Interference suppression Time domain analysis Frequency Detectors Signal detection Telephony Signal to noise ratio Discrete Fourier transforms Telecommunications Signal processing
Content Type	Text
Resource Type	Article

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