Title :
An adaptive technique for high resolution time-varying spectral estimation
Author :
Fineberg, Adam B. ; Mammone, Richard J.
Author_Institution :
Dept. of Electr. & Comput. Eng., Rutgers Univ., Piscataway, NJ, USA
Abstract :
An adaptive technique which determines the spectral coefficients of a time-varying signal is presented. The algorithm performs a least-squares decomposition of the signal onto a high-resolution nonharmonic Fourier basis. The spectral estimate is updated sample by sample and produces a decomposition with very good localization in both the time and frequency domains. This yields a distribution of signal intensities in the time-frequency plane which tracks the instantaneous frequency and local bandwidth of the signal. The detection of tones spaced closer than expected by the uncertainty distance (super-resolution) is shown by computer simulation. Numerical results demonstrate the super-resolving capability and fast tracking rate as well as the stability in the presence of additive noise. Potential applications of this method include tracking of frequency hopping communications, FM demodulation, and formant tracking in speech signals
Keywords :
computational complexity; least squares approximations; parameter estimation; signal processing; spectral analysis; tracking; FM demodulation; adaptive technique; computational complexity; computer simulation; formant tracking; frequency estimation; frequency hopping communications; high resolution time-varying spectral estimation; high-resolution nonharmonic Fourier basis; instantaneous frequency; least-squares decomposition; local bandwidth; speech signals; superresolving capability; time-varying signal; tracking rate; Additive noise; Application software; Bandwidth; Computer simulation; Frequency domain analysis; Frequency estimation; Signal resolution; Stability; Time frequency analysis; Uncertainty;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1991. ICASSP-91., 1991 International Conference on
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-0003-3
DOI :
10.1109/ICASSP.1991.150132