US 12,229,653 B2
Methods and apparatuses for implementing adaptive multi-trace carving to track signal traces
Qiang Zhu, College Park, MD (US); Mingliang Chen, Greenbelt, MD (US); Min Wu, Clarksville, MD (US); and Chau-Wai Wong, Apex, NC (US)
Assigned to UNIVERSITY OF MARYLAND, COLLEGE PARK, College Park, MD (US)
Appl. No. 17/276,577
Filed by UNIVERSITY OF MARYLAND, COLLEGE PARK, College Park, MD (US)
PCT Filed Sep. 19, 2019, PCT No. PCT/US2019/051979
§ 371(c)(1), (2) Date Mar. 16, 2021,
PCT Pub. No. WO2020/061346, PCT Pub. Date Mar. 26, 2020.
Claims priority of provisional application 62/733,397, filed on Sep. 19, 2018.
Prior Publication US 2022/0051075 A1, Feb. 17, 2022
Int. Cl. G06N 3/04 (2023.01); G10L 25/30 (2013.01)
CPC G06N 3/04 (2013.01) [G10L 25/30 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method of authenticating frequency traces, comprising:
iteratively tracking at least one candidate frequency trace from a time-frequency representation of a signal;
identifying all frequency traces of the signal via a multiple frequency traces tracking and detection procedure, wherein the multiple frequency traces tracking and detection procedure comprises
identifying at least one frequency trace comprising diffused energy of the signal within a predefined frequency range based on tracking results, and
determining an estimated frequency vector related to the at least one frequency trace by implementing an energy function, wherein the energy function comprises the time-frequency representation of the signal to be analyzed, and a regularization parameter that enforces smooth tracking results;
outputting the estimated frequency vector related to the at least one frequency trace;
reducing interference in subsequent iterations of tracking the at least one candidate frequency trace by attenuating, at an end of each iteration, diffused energy around the at least one frequency trace indicated by the estimated frequency vector; and
authenticating the identified frequency traces by validating all the identified and attenuated frequency traces against a reference source,
wherein the tracking is performed under a noisy condition environment.