Patent ID: 6427134
Filing Date: 2002-07-30
Classification: G10L

Abstract:
An apparatus comprising:means arranged in operation to calculate at least one first spectral difference measure indicative of the degree of spectral similarity in a pair of time segments of a signal, one of the time segments of the pair lagging the other by a first time interval; means arranged in operation to calculate at least one second spectral difference measure indicative of the degree of spectral similarity in a pair of time segments of the signal, one of the time segments of the pair lagging the other by a second time interval which differs from said first time interval; means arranged in operation to calculate a spectral irregularity measure on the basis of at least said first and second spectral difference measures; means arranged in operation to compare said spectral irregularity measure with a threshold measure; and means arranged in operation to determine whether the signal comprises of noise on the basis on the comparison.