Patent ID: 6170333
Filing Date: 2001-01-09
Classification: F22B,G01H

Abstract:
An apparatus for detecting an abnormal sound, comprising:means for pre-establishing a standard pattern vector having a feature value of a standard sound, said standard pattern including a plurality of elements;means for producing an input pattern vector having a feature value of a monitored sound, said input pattern including a plurality of elements corresponding to said plurality of elements of said standard pattern;means for producing a positive vector of a reference pattern having a value of an arbitrary reference shape, said reference pattern including a plurality of elements corresponding to said plurality of elements of said standard pattern;means for producing a negative vector of said reference pattern, said reference pattern including a plurality of elements corresponding to said plurality of elements of said standard pattern;means for increasing, with respect to each of said plurality of elements, an element of said positive vector by an absolute value of a difference between an element of said input pattern vector and a corresponding element of said standard pattern vector when the element of said input pattern vector is greater than the corresponding element of said standard pattern vector, and increasing, with respect to each of said plurality of elements, an element of said negative vector by an absolute value of a difference between an element of said input pattern vector and a corresponding element of said standard pattern vector when the element of said input pattern vector is smaller than the corresponding element of said standard vector;means for calculating a difference between a kurtosis of said positive vector processed by said increasing means and a kurtosis of said negative vector processed by said increasing means; andmeans for obtaining a value of geometric distance between said standard pattern vector and said input pattern vector based on the calculated difference of the kurtosis.