Patent ID: 7269537
Filing Date: 2007-09-11
Classification: G01V

Abstract:
1. A method for filtering unwanted components from an infrasound signal, the method comprising the steps of: (a) sampling an infrasound signal corrupted with undesired disturbances, (b) sampling a change in fluid speed signal that is correlated with the undesired disturbances, (c) preconditioning the change in fluid speed signal using a calibration of the sensor housing, (d) filtering the preconditioned values with an adaptive filter to generate a correction term, (e) adding the correction term to the sampled, corrupt infrasound signal, (f) outputting a corrected infrasound signal, (g) feeding back the corrected infrasound signal to be used in conjunction with the past history of preconditioned values to adjust the parameters used within the adaptive filter of step (c), whereby the disturbances effects caused by changes in the fluid speed are removed from the corrupted infrasound signal to provide a filtered measure of infrasound.