Patent ID: 6411925
Filing Date: 2002-06-25
Classification: G10L

Abstract:
A speech processing apparatus comprising:means for receiving an input speech signal; means for dividing the received speech signal into a number of successive time frames; means for determining the frame energy distribution of energy with frequency within each of said time frames; means for determining the maximum energy level within the current time frame of the determined frame energy distribution, wherein the maximum energy level is denoted by melmax; means for storing a predetermined energy level denoted by melrange; means for determining a minimum energy level for the current time frame of the determined frame energy distribution, wherein the determined minimum energy level is denoted by melmin and is determined by the following formula: melmin=melmaxâˆ’melpredetermined; and means for changing the determined frame energy distribution for the current time frame by setting any energy levels which are below melmin to equal melmin.