US 12,267,188 B2
Magnitude equalization of audio-based data transmissions
Rebekah Farrar, Oakland, CA (US)
Assigned to LISNR, INC., Cincinnati, OH (US)
Appl. No. 17/756,348
Filed by LISNR, Inc., Cincinnati, OH (US)
PCT Filed Nov. 22, 2019, PCT No. PCT/US2019/062820
§ 371(c)(1), (2) Date May 23, 2022,
PCT Pub. No. WO2021/101570, PCT Pub. Date May 27, 2021.
Prior Publication US 2022/0385503 A1, Dec. 1, 2022
Int. Cl. H04L 25/03 (2006.01)
CPC H04L 25/03159 (2013.01) 18 Claims
OG exemplary drawing
 
1. A method comprising:
receiving, at a microphone, an audio transmission including data modulated onto an audio signal;
identifying a first portion of the audio transmission, the first portion including predetermined frequencies that are produced at predetermined times;
determining a first frequency distribution identifying a power distribution for at least one predetermined frequency of the predetermined frequencies during the first portion of the audio transmission;
identifying a magnitude for the at least one predetermined frequency within the first frequency distribution;
identifying a second portion of the audio transmission;
equalizing the second portion of the audio transmission according to the magnitude for the at least one predetermined frequency comprising:
determining a second frequency distribution of the second portion of the audio transmission; and
dividing a magnitude of the at least one predetermined frequency within the second frequency distribution by the magnitude for the at least one predetermined frequency within the first frequency distribution, and
demodulating the second portion of the audio transmission to extract the data.