Title :
A time-varying kernel for ultrasound Doppler spectra
Author :
Oung, Harry ; Forsberg, Flemming
Author_Institution :
Dept. of Radiol., Thomas Jefferson Univ. Hospital, Philadelphia, PA, USA
Abstract :
A new time-varying kernel has been formulated and tested for the bilinear time-frequency representation (BTFR) of signals. This kernel reshapes itself to track the instantaneous frequency of the signal, so that kernel smoothing does not necessarily yield poor resolution. Performance analyses were based upon mono-component FM (deterministic) and ultrasound Doppler (non-deterministic) signals. The results show that the new kernel improves the compromise between cross-terms (or variance) reduction and time-frequency resolution
Keywords :
Doppler shift; Wigner distribution; acoustic signal processing; bioacoustics; biomedical ultrasonics; medical signal processing; signal representation; signal resolution; time-frequency analysis; bilinear time-frequency representation; cross-terms reduction; deterministic signals; instantaneous frequency; kernel smoothing; nondeterministic signals; performance analyses; resolution; time-frequency resolution; time-varying kernel; tracking; ultrasound Doppler spectra; variance reduction; Autocorrelation; Fourier transforms; Kernel; Performance analysis; Radiology; Signal resolution; Smoothing methods; Testing; Time frequency analysis; Ultrasonic imaging;
Conference_Titel :
Time-Frequency and Time-Scale Analysis, 1994., Proceedings of the IEEE-SP International Symposium on
Conference_Location :
Philadelphia, PA
Print_ISBN :
0-7803-2127-8
DOI :
10.1109/TFSA.1994.467291
