Patent ID: 8825188

Claim:
A method of processing audio signals to identify content, method comprising: receiving a first plurality of bit stream audio channels; enhancing, using a first circuit, artifacting, noise, and/or aliasing with respect to the first plurality of bit stream audio channels at least in part by sampling the plurality of bit stream audio channels; analyzing, using a signal analysis system, the first plurality of bit stream audio channels after performing the enhancement of the artifacting, noise, and/or aliasing to identify content type included in the first plurality of bit stream audio channels by measuring: at least signal noise, and one or more of the following: bandwidth, spectral energy, convergence, aliasing, or spectral symmetry; based at least in part on the analysis, identifying, using an identification circuit, commercial content included in the first plurality of bit stream audio channels; wherein the enhancement of the artifacting, noise and/or aliasing is performed at least in part by adding noise to the first plurality of bit stream audio channels by an amount sufficient to reveal signal to noise variance in non-commercial content included in the first plurality of bit stream audio channels, identifying commercial content included in the first plurality of bit stream audio channels further comprises utilizing loudness, noise and frequency spectrum analyzers in identifying commercial content, and two or more of the first plurality of bit stream audio channels are summed, combined, or subtracted and then down mixed to one or more channels to reduce redundant signal information and decoder channel modes.