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US 11,557,188 B2Granted
Gunshot detection device, system and method
AssigneeHalo Smart Solutions, Inc.
InventorsDavid Antar, Paul Galburt, Frank L. Jacovino, David Rayna
Life of this patent
Estimating the term…
Abstract
A system, device and method facilitate accurate detection of gunshot events through spectrum analysis of impulse signals and/or evaluating impulse signal exponential decay amplitude and time values. In various embodiments, the device and system employ an acoustic sensor, one or more high-pass and low-pass filters, a threshold detector, a differentiator, a decay waveform shape generator, one or more comparators and one or more timers to facilitate detection of gunshot events and/or components of gunshot events.
Claims17
A method for facilitating a gunshot detection, comprising:
- receiving a sound signal via an acoustic sensor;
- filtering the sound signal through a high pass filter to provide a filtered signal;
- filtering the filtered signal through a first low pass filter to provide an original channel signal envelope comprising an original channel signal amplitude measurement;
- filtering the filtered signal through a differentiator and a second low pass filter to provide a differentiated signal comprising a differentiated signal amplitude measurement;
- comparing the original channel signal amplitude measurement with the differentiated signal amplitude measurement;
- upon the differentiated signal amplitude measurement being at least a first fractional portion of the original channel signal amplitude measurement, generating a first partially qualified positive gunshot detection signal;
- determining that the filtered signal exceeds a preset, threshold sound level at a given time;
- generating a secondary partially qualified positive gunshot detection signal;
- and
- based on the first partially qualified positive gunshot detection signal and the secondary partially qualified positive gunshot detection signal, generating a fully qualified positive gunshot detection signal.
7 more elements
A device for facilitating a gunshot detection, comprising:
- an acoustic sensor;
- and
- a processor, and a memory storing instructions, that when executed by the processor, cause the processor to:
- receive a sound signal via the acoustic sensor;
- filter the sound signal through a high pass filter to provide a filtered signal;
- filter the filtered signal through a first low pass filter to provide an original channel signal envelope comprising an original channel signal amplitude measurement;
- filter the filtered signal through a differentiator and a second low pass filter to provide a differentiated signal comprising a differentiated signal amplitude measurement;
- compare the original channel signal amplitude measurement with the differentiated signal amplitude measurement;
- upon the differentiated signal amplitude measurement being at least a first fractional portion of the original channel signal amplitude measurement, generate a first partially qualified positive gunshot detection signal;
- determine that the filtered signal exceeds a preset threshold sound level at a given time;
- generate a secondary partially qualified positive gunshot detection signal;
- and
- based on the first partially qualified positive gunshot detection signal and the secondary partially qualified positive gunshot detection signal, generate a fully qualified positive gunshot detection signal.
10 more elements
A method for facilitating valid gunshot detections, comprising:
- receiving a sound signal by an acoustic sensor;
- filtering the sound signal through a high pass filter to provide a filtered signal;
- filtering the filtered signal through a first low pass filter to provide a signal envelope comprising an original channel signal amplitude measurement;
- filtering the filtered signal through a differentiator and a second low pass filter to provide a differentiated signal comprising a differentiated signal amplitude measurement;
- comparing the original channel signal amplitude measurement with the differentiated signal amplitude measurement;
- and
- upon the differentiated signal amplitude measurement being at least a first fractional portion of the original channel signal amplitude measurement, generating a detected event communication.
4 more elements
A system, comprising:
- a primary sensor unit in communication with a network, wherein the primary sensor unit comprises a primary acoustic sensor and a primary processing component;
- and
- a secondary sensor unit in communication with the network, wherein the secondary sensor unit comprises a secondary acoustic sensor and a secondary processing component;
- wherein the primary processing component comprises a primary processor, and a primary memory storing instructions, that when executed by the primary processor, cause the primary processor to:
- receive a sound signal via the primary acoustic sensor;
- filter the sound signal through a primary sensor unit high pass filter to provide a primary sensor unit filtered signal;
- filter the primary sensor unit filtered signal through a primary sensor unit first low pass filter to provide a primary sensor unit original channel signal comprising a primary sensor unit original channel signal amplitude measurement;
- filter the primary sensor unit filtered signal through a primary sensor unit differentiator and a primary sensor unit second low pass filter to provide a primary sensor unit differentiated signal comprising a primary sensor unit differentiated signal amplitude measurement;
- compare the primary sensor unit original channel signal amplitude measurement with the primary sensor unit differentiated signal amplitude measurement;
- and
- upon the primary sensor unit differentiated signal amplitude measurement being at least a first fractional portion of the primary sensor unit original channel signal amplitude measurement generate a first partially qualified positive gunshot detection signal;
- wherein the secondary processing component comprises a secondary processor, and a secondary memory storing instructions, that when executed by the secondary processor, cause the secondary processor to:
- receive the sound signal via the secondary acoustic sensor;
- determine that the signal exceeds a preset threshold sound level at a given time;
- generate a secondary partially qualified positive gunshot detection signal;
- receive, via the network, the first partially qualified positive gunshot detection signal;
- and
- generate a fully qualified positive gunshot detection signal.
15 more elements
Dependencies are inferred from the claim text.