Improved Wigner-Ville distribution performance by signal decomposition and modified group delay

Improved Wigner-Ville distribution performance based on DCT/DFT harmonic wavelet transform and modified magnitude group delay

A new Wigner-Ville Distribution (WVD) estimation is proposed. This improved and efficient WVD is based on Signal Decomposition (SD) by DCT or DFT Harmonic Wavelet Transform (DCTHWT or DFTHWT) and the Modified Magnitude Group Delay (MMGD). The MMGD processing can be either in fullband or subband. The SD by DCTHWT provides better quality low leakage decimated subband components. The concatenation...

Pathologies cardiac discrimination using the Fast Fourir Transform (FFT) The short time Fourier transforms (STFT) and the Wigner distribution (WD)

This paper is concerned with a synthesis study of the fast Fourier transform (FFT), the short time Fourier transform (STFT and the Wigner distribution (WD) in analysing the phonocardiogram signal (PCG) or heart cardiac sounds.     The FFT (Fast Fourier Transform) can provide a basic understanding of the frequency contents of the heart sounds. The STFT is obtained by calculating the Fourier tran...

Decomposition of the Wigner-Ville distribution and time-frequency distribution series

Estimation of evolutionary spectrum based on short time Fourier transform and modified group delay

This paper proposes a new estimator for evolutionary spectrum (ES) based on short time Fourier transform (STFT) and modified group delay function (GDFM). The STFT due to its built-in averaging suppresses the crossterms and the GDFM preserves the frequency resolution of the rectangular window as it reduces the Gibbs ripple without using any window function. The new estimator is applicable to ran...

Voice activity detection using modified Wigner-ville distribution

This paper introduces a new method of voice activity detection (VAD) using modified Wigner-Ville distribution. Modified Wigner-Ville distribution can track the speech regions efficiently in noisy environments. Fourier Transform (FT) and Discrete Cosine Transform (DCT) variants of Wigner-Ville distribution based, voice activity detection schemes are presented. The efficient time frequency spectr...