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Short review on the design and application of fractional delay Hilbert transform filter using Farrow structure

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Fractional delay filter (FDF) has very important place in the family of digital special filters. In the paper written by Laakso T.I, Välimäki V., Karjalainen M., Laine U.K. in 1996 [1], which is very often recalled as an extensive review of the delaying filtering of the signal (particularly in the case of the non-integer value of the delay, i.e. fractional delaying of the signal), it is desc[...]

Pitch estimation of narrowband-filtered speech signal using instantaneous complex frequency

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Speech signal generation is based on production and processing of the acoustic vibrations. Vocal cords and track take part in this process. Vocal track consists of oral cavity, nasal cavity, tongue and lips. Model of speech signal generation is presented in Fig 1. Vocal cords produce acoustic signal, which is then modified when passing through the vocal track. Magnitude characteristic of the[...]

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