Patent ID: 6529866
Filing Date: 2003-03-04
Classification: G10L

Abstract:
A method of building a filter for removing noise from a signal comprising the steps of:transforming the signal from a time domain to a frequency domain; sorting the transformed signal into a plurality of energy-level sectors; ordering the sectors by energy level; selecting a threshold energy-level value, wherein the threshold energy-level value comprises the fifty-sixth energy-level value, comprising the steps of, summing the energy levels of all sectors to calculate a total energy content of the signal, determining a percentage retention value, sequentially summing energy levels starting from a highest energy level to form a running total until the running total divided by the total energy content reaches the percentage retention value, and assigning a last-added energy level from the sequentially summing step to the threshold value; removing signal from all sectors below the threshold energy-level value; and, reordering the sectors in frequency order.