A real-time autoregressive spectrum analyzer for Doppler ultrasound signals.
A system based on a digital signal processor and a microcomputer has been programmed to estimate the maximum entropy autoregressive (AR) power spectrum of ultrasonic Doppler shift signals and display the results in the form of a sonogram in real-time on a computer screen. The system, which is based on a TMS 320C25 digital signal processor chip, calculates spectra with 128 frequency components from 64 samples of the Doppler signal. The samples are collected at a programmable rate of up to 40.96 kHz, and the computation of each spectrum takes typically 3.2 ms. The feasibility of on-line AR spectral estimation makes this type of analysis an attractive alternative to the more conventional fast Fourier transform approach to the analysis of Doppler ultrasound signals.
Schlindwein
F S
FS
Universidade Federal do Rio de Janeiro, Brazil.
Evans
D H
DH
D000703:Analog-Digital Conversion; D007091:Image Processing, Computer-Assisted; D008838:Microcomputers; D012044:Regression Analysis; D012984:Software; D013057:Spectrum Analysis / Q000295:instrumentation*; D014463:Ultrasonography / Q000295:instrumentation