# US 2016/0118059 A1 · Drone detection and classification methods and apparatus

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- Number: US 2016/0118059 A1
- Document ID: US20160118059A1
- Status: Published application
- Kind: A1
- Application number: 14/950,593
- Filed: 2015-11-24
- Published: 2016-04-28
- Earliest claimed: 2014-04-22
- Assignees: Droneshield, LLC
- Applicants: DroneShield, LLC
- Inventors: Brian Hearing; John Franklin
- Web page: https://patentgrep.com/patent/US20160118059A1

## CPC

- G10L 25/51: for comparison or discrimination
- G01H 1/00: Measuring {characteristics of} vibrations in solids by using direct conduction to the detector (G01H9/00, G01H11/00 take precedence)
- G01S 3/80: using ultrasonic, sonic or infrasonic waves
- G01S 5/18: using ultrasonic, sonic or infrasonic waves
- G10L 19/00: Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis (in musical instruments G10H)
- G10L 25/18: the extracted parameters being spectral information of each sub-band
- G10L 25/54: for retrieval
- H04R 29/00: Monitoring arrangements; Testing arrangements {(for hearing aids H04R25/30; detection of loudspeaker connection H04R5/04; sound-field adaptation dependent on speaker detection H04S7/308)}
- H04R 2410/00: Microphones
- G10L: SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G01H: MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K)

## Abstract

A system, method, and apparatus for drone detection and classification are disclosed. An example method includes receiving a sound signal in a microphone and recording, via a sound card, a digital sound sample of the sound signal, the digital sound sample having a predetermined duration. The method also includes processing, via a processor, the digital sound sample into a feature frequency spectrum. The method further includes applying, via the processor, broad spectrum matching to compare the feature frequency spectrum to at least one drone sound signature stored in a database, the at least one drone sound signature corresponding to a flight characteristic of a drone model. The method moreover includes, conditioned on matching the feature frequency spectrum to one of the drone sound signatures, transmitting, via the processor, an alert.

## Claims

### Claim 1

An apparatus for detecting drones comprising:
a microphone configured to receive a sound signal;
a sound card configured to record a digital sound sample of the sound signal, the digital sound sample having a predetermined duration; and
a sample processor configured to:
process the digital sound sample into a feature frequency spectrum,
process at least one drone sound sample into a drone sound signature,
use broad spectrum matching to compare the feature frequency spectrum to the at least one drone sound signature, the at least one drone sound signature corresponding to a flight characteristic of a drone, and
conditioned on matching the feature frequency spectrum to one of the drone sound signatures, transmit an alert.