Practical Humming Query Processing Method for QBH System

A humming signal processing system in noise environment is presented.First,the spectrum subtraction method is used to eliminate the noise in the humming signals.Then,the pitch is extracted by combining the average magnitude difference function(AMDF) and the autocorrelation function(AUTOC).Followed with two times median smoothing processing,the improved method of spread windowing is adopted to segment notes.The music melody are presented by the characteristics of pitch and time.The experiment′s results show that the humming signal can be converted to melodic characteristics exactly and effectively,besides with well antinoise performance.Among the 60 tested songs′ segments,the average right ratio comes up to 91.4%.