Patent ID: 11961527
Assignee: THE NIELSEN COMPANY (US), LLC
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 14:
15. A method to decode information encoded in an audio signal, the method comprising:
determining, one or more processors, characteristics of frequencies of a frequency domain representation of the audio signal;
normalizing, by the one or more processors, the characteristics of the frequencies of the frequency domain representation in respective ones of a plurality of code bands to determine normalized characteristics of the frequencies, a first code band of the plurality of code bands to be normalized against a first characteristic of a first frequency in the first code band;
computing, by the one or more processors, a sum of the normalized characteristics of the frequencies;
determining, by the one or more processors, that the sum is representative of a symbol when the sum satisfies a threshold; and
outputting, by the one or more processors, a code corresponding to the symbol.