3. Short-Time Chirp Transform

Smeared FFT representation of harmonic lines in case of changing pitch.

Method Description:
To replace the harmonics in the Fourier transform with Chirps.



Replacement of the harmonics in Fourier trf by properly designed chirps provide a new orthogonal transform, which over-performs Fourier significantly in cases like mentioned above. The gain we get in enhanced T-F representation could be well used for speech enhancement and other methods, as discussed in our papers.

[1] Weruaga, L. and Képesi, M: “Speech analysis with the Short-time Chirp transform”, 8th European Conf. on Speech , EUROSPEECH 2003, Geneva, Sept 2003, vol.I, pp.53-56.
[2] Képesi, M. Weruaga, L.: “Speech Analysis with the Fast Chirp Transform, ” EUSIPCO 2004, the 12th European Signal Processing Conference, Wien, Austria, 7-10 September 2004
[3] Weruaga, L. and Képesi, M.: “EM-driven Stereo-like Gaussian Chirplet Mixture Estimation”, ICASSP 2005, IEEE International Conference on Acoustics, Speech, and Signal Processing. March 1923, IV, pp. 473-476, 2005, Philadelphia, USA.
[4] L. Weruaga and M. Képesi, “Self-organizing chirp-sensitive artificial auditory cortical model,” Interspeech 2005, pp. 705-708, Lisboa (P), Sep. 2005.
[5] M. Képesi, L. Weruaga, “Adaptive chirp-based time-frequency analysis of speech signals”, Speech Comm., vol.48, pp. 474-492, 2006.
[6] L. Weruaga, M. Képesi, “The fan-chirp transform for non-stationary harmonic sounds”, Signal Proc., vol. 87, pp. 1504-1522, 2007.

Related Work:
R Dunn, TF Quatieri, “Sinewave Analysis/Synthesis Based on the Fan-Chirp Tranform,” IEEE Workshop on Applications of Signal Processing to …, 2007
[8] Macej Bartkowiak, “Application of the Fan-Chirp Transform to Hybrid Sinusoidal+Noise Modeling of Polyphonic Audio,” Eusipco 2008, Lausanne, Switzerland
[9] Pei Zhao; Zhiping Zhang; Xihong Wu, “Monaural speech separation based on multi-scale Fan-Chirp Transform,” Acoustics, Speech and Signal Processing, 2008. ICASSP 2008, March 31 2008-April 4 2008 Page(s):161 – 164
[10] Ha Nguyen, Luis Weruaga: “Time–Frequency Analysis of Vietnamese Speech Inspired on Chirp Auditory Selectivity,” Book Series Lecture Notes in Computer Science, pp. 284-295, Springer Berlin / Heidelberg, Volume 5351/2008, 2008,
ISBN 978-3-540-89196-3
[11] “FAN CHIRP TRANSFORM FOR MUSIC REPRESENTATION”, P. Cancela, E. Lopez, M. Rocamora, DAFx 2010.
[12] Pei Zhao, Zhiping Zhang, Xihong Wu: Monaural speech separation based on multi-scale Fan-Chirp Transform, ICASSP 2008. March 31 2008, Page(s): 161 – 164
[13] Hui Yin, Climent Nadeu, and Volker Hohmann1: Pitch- and Formant-Based Order Adaptation of the Fractional Fourier Transform and Its Application to Speech Recognition, Hindawi Publishing Corporation, EURASIP Journal on Audio, Speech, and Music Processing Volume 2009, Article ID 304579.


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