Patent ID: 7738949

Claim:
A method for transforming physiological data from a time domain to a frequency domain, including the steps of: (a) providing a plurality of physiological data in the time domain; (b) providing a microcomputer programmed to run a recursive Fourier transform estimation algorithm; (c) initializing a plurality of frequency coefficients; (d) receiving said data in the time domain; (e) calculating, for each newly received data point in the time domain, an integer index using modulo(N) arithmetic based on a time said each newly received data point was received; (f) selecting a frequency vector from a plurality of N frequency vectors using said integer index; (g) updating a plurality of frequency coefficients according to a recursive equation including said selected frequency vector as an input variable; (h) performing iteratively steps (d) to (g) thereby transforming said received data in the time domain to data in the frequency domain; and(i) recording said data in the frequency domain for later use as output or as data for display to a user to allow the user to more easily distinguish a diseased state of a patient based on the displayed physiological data in the frequency domain as compared to the received physiological data in the time domain.