Methods and apparatus for characterizing media

摘要

An apparatus, comprising a transformer (908) to convert at least a portion of a block of audio into a frequency domain representation including a plurality of frequency components. The apparatus further comprises a decision metric processor to define a band of frequency components having real and imaginary spectral components; define a plurality of frequency bins within the band; determine respective functions for each of the frequency bins using a product of the real and imaginary spectral components of a corresponding group of the frequency bins, wherein the corresponding group for a first one of the frequency bins includes at least the first one of the frequency bins and a second one of the frequency bins selected based on the first frequency bin; and determine a decision metric for the band by summing the functions. The apparatus further comprises a signature determiner (914) to determine a signature based on a value of the decision metric and a processor to implement at least one of the transformer (908), the decision metric processor, or the signature determiner (914). 73150331 P012791D2 20004/357AU02