NDLI: An efficient algorithm for DTMF decoding using the subband NDFT

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An efficient algorithm for DTMF decoding using the subband NDFT

Content Provider	IEEE Xplore Digital Library
Author	Bagchi, S. Mitra, S.K.
Copyright Year	1995
Description	Author affiliation: Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA (Bagchi, S.; Mitra, S.K.)
Abstract	An algorithm based on the subband nonuniform discrete Fourier transform (SB-NDFT) is proposed for decoding dual-tone multi-frequency (DTMF) signals. To decode a DTMF signal, its energy at the eight DTMF frequencies must be determined by evaluating samples of the NDFT at these frequencies. In the proposed SB-NDFT algorithm, these NDFT samples are computed by decomposing the input signal into two subbands. Since DTMF signals occupy the low-frequency part of the telephone bandwidth, the higher subband can be discarded for a fast, approximate computation. A performance comparison between algorithms based on the NDFT, SB-NDFT, DFT, and SB-DFT shows that the SB-NDFT requires the lowest number of computations to attain a specified level of performance.
Starting Page	1936
Ending Page	1939
File Size	356496
Page Count	4
File Format	PDF
ISBN	0780325702
DOI	10.1109/ISCAS.1995.523798
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-04-30
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Decoding Frequency Discrete Fourier transforms Signal processing Image processing Laboratories Telephony Bandwidth Communication system signaling Telephone sets
Content Type	Text
Resource Type	Article

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