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Efficient Dual-Tone Multifrequency Detection Using the Nonuniform Discrete Fourier Transform IEEE Signal Processing Letters, vol. 5, No. 7, Felder et al., Jul. 1998. |
The Nonuniform Discrete Fourier Transform and Its Applications in Filter Design IEEE Transactions o circuits and Systems—II: Analog and Digital Signal Processing, vol. 43, No. 6, Bagchi, Jun. 1996. |