Patent ID: 9202472
Filing Date: 2015-12-01
Classification: G10L

Abstract:
1. A method, comprising: identifying, by a system including one or more processors, a set of interest points in a time-frequency representation of an audio signal; grouping, by the system, interest points of the set of interest point into subsets, wherein each subset comprises a plurality of interest points; determining, by the system, respective magnitudes of the interest points in the subsets; and determining, by the system, respective first descriptors for the subsets for the audio signal comprising, for each subset: for each interest point in the subset: determining a mean magnitude across a time-frequency window centered at the interest point, and dividing a magnitude of the interest point by the mean magnitude to yield a strength value for the interest point; ordering the respective strength values of interest points in the subset as a function of size to yield a magnitude ordering of the interest points in the subset; encoding the magnitude ordering into a first descriptor associated with the subset; quantizing the strength values of interest points in the subset to yield quantized strength values; and encoding the quantized strength values associated with the subset into the first descriptor associated with the subset.