Patent ID: 7395292
Filing Date: 2008-07-01
Classification: A61B

Abstract:
1. A method for displaying changes in spectral content of data signals over periods of time comprising the steps of: transforming time segments of digitized data signals into a frequency based spectral representation of the digitized data; grouping the resulting spectral data into appropriate frequency bins, with each frequency bin normalized by the frequency range of the bin; multiplying the energy or power in each frequency bin by f calculating a logarithmic value for each frequency bin; mapping the logarithmic value of each frequency bin for each time period to a color or gray-scale value; and displaying the mapped color or gray-scale value as an image, where the signal frequency is represented along one axis, time is represented along a second axis, and the value of the energy or power at that given time and frequency is displayed as the color or gray-scale value assigned to that point.