Title :
Optimal databased complex demodulation for evolutionary spectra
Author_Institution :
Courant Inst. of Math. Sci., New York, NY, USA
Abstract :
Complex demodulation of evolutionary spectra is formulated as a two-dimensional kernel smoother in the time-frequency domain. A tapered Fourier transform is calculated, and the log-spectral estimate is smoothed. As the characteristic widths of the kernel smoother increase, the bias from temporal and frequency averaging increases while the variance decreases. The demodulation parameters are chosen by minimizing the expected error using the plug-in approximation
Keywords :
Fourier transforms; demodulation; spectral analysis; time-frequency analysis; demodulation; evolutionary spectra; log-spectral estimate; optimal databased complex modulation; plug-in approximation; tapered Fourier transform; time-frequency domain; two-dimensional kernel smoother; Bandwidth; Databases; Demodulation; Density measurement; Frequency estimation; Frequency measurement; Kernel; Lattices; Sampling methods; Time measurement;
Conference_Titel :
Time-Frequency and Time-Scale Analysis, 1992., Proceedings of the IEEE-SP International Symposium
Conference_Location :
Victoria, BC
Print_ISBN :
0-7803-0805-0
DOI :
10.1109/TFTSA.1992.274185
