Patent ID: 8457771

Claim:
A method for filtering a data stream, the method comprising: partitioning the data stream into a plurality of data stream segments, each of the plurality of data stream segments comprising a plurality of frames; measuring an acoustic parameter in each of the plurality of frames; computing a change in the acoustic parameter between adjacent ones of the plurality of frames; computing, for each data stream segment of the plurality of data stream segments, a maximum absolute slope of the acoustic parameter across a predetermined number of the plurality of frames of the data stream segment based on the change in the acoustic parameter between the adjacent ones of the plurality of frames of the data stream segment to determine whether a predetermined condition is satisfied; identifying the data stream segment as an extraneous portion of the data stream when the predetermined condition is satisfied; and deleting the extraneous portion from the data stream to produce a filtered data stream, wherein the predetermined condition includes the maximum absolute slope of the data stream segment being greater than a minimum value.