Patent ID: 11894011
Assignee: THE NIELSEN COMPANY (US), LLC
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 8:
9. An apparatus to reduce harmonic noise, the apparatus comprising:
at least one memory;
computer readable instructions in the apparatus;
processor circuitry to execute the computer readable instructions to at least:
determine a first amplitude value in a frequency spectrum of an audio sample;
determine one or more points in the frequency spectrum having at least one of (a) a second amplitude value within an amplitude threshold of the first amplitude value, (b) a frequency value within a frequency threshold of the first amplitude value, or (c) a phase value within a phase threshold of the first amplitude value;
generate a contour trace, wherein the contour trace includes at least one of the determined first amplitude value and the determined one or more points;
based on the contour trace, modify the audio sample; and
determine if the contour trace is an outlier based on a distance from a parameter of the contour trace.