Patent ID: 11955136
Assignee: ARIZONA BOARD OF REGENTS ON BEHALF OF ARIZONA STATE UNIVERSITY
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. An audio sensing device, comprising:
an audio sensor operable for receiving a sound and generating audio data descriptive of the sound;
a processor in communication with the audio sensor and configured for executing instructions which, when executed, cause the processor to:
receive audio data descriptive of the sound from the audio sensor;
transform the audio data into a plurality of frequency domain frames;
determine a first amplitude of a first frequency domain frame of the plurality of frequency domain frames and a second amplitude of a second frequency domain frame of the plurality of frequency domain frames;
determine a first spectral centroid of the first frequency domain frame and a second spectral centroid of the second frequency domain frame;
determine if a steepness of an amplitude difference vector between the first amplitude and the second amplitude is indicative of a sharp increase in an amplitude of the sound;
determine if a steepness of a spectral centroid difference vector between the first spectral centroid and the second spectral centroid is indicative of a sharp decrease in a spectral centroid of the sound; and
indicate if the amplitude difference vector is indicative of a sharp increase in an amplitude of the sound and if the spectral centroid difference vector is indicative of a sharp decrease in a spectral centroid of the sound,
wherein the processor detects a gunshot by computation of a vector of change from the audio data, the vector of change including outputs of a direction and a magnitude that reflect a quick rise and fall time of the sound indicative as to a presence of the gunshot.