JSIP  Vol.3 No.3 , August 2012
Non-Stationary Signal Segmentation and Separation from Joint Time-Frequency Plane
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Abstract: Multi-components sinusoidal engineering signals who are non-stationary signals were considered in this study since their separation and segmentations are of great interests in many engineering fields. In most cases, the segmentation of non-stationary or multi-component signals is conducted in time domain. In this paper, we explore the advantages of applying joint time-frequency (TF) distribution of the multi-component signals to identify their segments. The Spectrogram that is known as Short-Time Fourier Transform (STFT) will be used for obtaining the time-frequency kernel. Time marginal of the computed kernel is optimally used for the signal segmentation. In order to obtain the desirable segmentation, it requires first to improve time marginal of the kernel by using two-dimensional Wiener mask filter applied to the TF kernel to mitigate and suppress non-stationary noise or interference. Additionally, a proper choice of the sliding window and its overlaying has enhanced our scheme to capture the discontinuities corresponding to the boundaries of the candidate segments.
Cite this paper: A. Alshehri, "Non-Stationary Signal Segmentation and Separation from Joint Time-Frequency Plane," Journal of Signal and Information Processing, Vol. 3 No. 3, 2012, pp. 339-343. doi: 10.4236/jsip.2012.33043.

[1]   C. Panagiotakis and G. Tziritas, “A Speech/Music Discriminator Based on RMS and Zero-Crossing,” IEEE Transactions on Multimedia, Vol. 7, No. 1, 2005, pp. 155-166. doi:10.1109/TMM.2004.840604

[2]   S. Mahmoodi and B. Sharif, “Signal Segmentation and Denoising Algorithm Based on Energy Optimization,” Signal Processing, Vol. 85, No. 9, 2005, pp. 1845-1851. doi:10.1016/j.sigpro.2005.03.016

[3]   H. Azami, K. Mohammadi and B. Bozorgtabar, “An Improved Signal Segmentation Using Moving Average and Savitzky-Golay Filter,” Journal of Signal and Information Processing, Vol. 3, No. 1, 2012, pp. 39-44. doi:10.4236/jsip.2012.31006

[4]   H. Hassanpour and S. M. Anisheh, “An Improved Adaptive Signal Segmentation Method Using Fractal Dimension,” IEEE Conference on Information Science, Signal Processing and their Applications, Kuala Lumpur, 10-13 May 2010, pp. 720-723.

[5]   S. M. Anisheh and H. Hassanpour, “Adaptive Segmentation with Optimal Window Length Scheme using Fractal Dimension and Wavelet Transform,” International Journal of Engineering, Vol. 22, No. 3, 2009, pp. 257-268.

[6]   G. Proakis and M. Salehi, “Communication Systems Engineering,” Prentice Hall, Upper Saddle River, 1994.

[7]   R. G. Lyons, “Digital Signal Processing,” Prentice Hall, Upper Saddle River, 2004.

[8]   L. Cohen, “Time-Frequency Analysis,” Prentice Hall, Englewood Cliffs, 1995.

[9]   M. H. Ackroyd, “Short-Time Spectra and Time-Fre- quency Energy Distributions,” Journal of Acoustical Society of America, Vol. 50, No. 5A, 1971, pp. 1229-1231. doi:10.1121/1.1912761

[10]   R. Suleesathira, L. F. Chaparro and A. Akan, “Discrete Volutionary Transform for Time-Frequency Signal Ana- lysis,” Journal of the Franklin Institute, Vol. 337, No. 4, 2000, pp. 347-364.

[11]   H. Khan and L. F. Chaparro, “Formulation and Implementation of the Non-Stationary Evolutionary Wiener Filtering,” Signal Processing, Vol. 76, No. 3, 1999, pp. 243-267.

[12]   L. F. Chaparro and A. A. Alshehri, “Jammer Excision in Spread Spectrum Communications via Wiener Masking and Frequency-Frequency Evolutionary Transform,” 2003 IEEE International Conference on Acoustics, Speech, and Signal Processing, Vol. 4, 6-10 April 2003, pp. 473-476.

[13]   L. F. Chaparro, R. Suleesathira, A. Akan and B. Unsal, “Instantaneous Frequency Estimation Using Discrete Evolutionary Transform for Jammer Excision,” 2001 IEEE International Conference on Acoustics, Speech, and Signal Processing, Salt Lake City, 7-11 May 2001, pp. 3525-3528.

[14]   A. A. Alshehri, L. F. Chaparro and A. Akan, “Evolutionary Wiener Mask Receiver for Multiuser Direct Sequence Spread Spectrum,” Proceedings of EUSIPCO-2005, September 2005.