Patent ID: 9557365
Date: 2017-01-31
CPC Classifications: G01R,H04S

Claim:
1. A method of processing audio data to detect corona comprising: determining a first indicator of an energy at a substantially fundamental frequency in audio data from an audio detector operated in a frequency range from 20 Hertz (Hz) to 20,000 Hz and deployed to detect corona generated by an alternating current (AC) system; determining a second indicator corresponding to the energy at a plurality of harmonic frequencies in the audio data by summing the energy at each of the plurality of harmonic frequencies in the audio data; determining a third indicator of noise energy in the audio data; determining a comparison indicator based on a comparison of the second indicator and the third indicator; determining a masking indicator based on normalized energy at each of the harmonic frequencies; and determining a corona detection indicator based on the comparison indicator and the masking indicator.