Abstract:
A system for noise detection. Aspects of the system include a detection unit for detecting and responding to a predetermined noise such as a gunshot. In some embodiments, at least a portion of the unit may be utilized both within a confined space, such as a room in a building, or inside a machine, and in large environments such as outdoors. The detection unit may comprise a digital computing device, a digital-to-analog converter, a speaker acoustic output, a microphone acoustic input, an analog-to-digital converter, and a transmitter.
Abstract:
The present technology may be directed a system for determining an angle and distance between a positioning node and secondary device using a plurality of acoustic transmitters to transmit acoustic ranging signals that are modulated using ranging sequences, respectively. The system includes an acoustic receiver to detect the acoustic ranging signals, and a signal processor to calculate times of arrival and a plurality of aliased angles of arrival of the acoustic ranging signals. An anti-aliasing module may select an angle of arrival from the calculated plurality of aliased angles using the times of arrival of the acoustic ranging signals. A time of flight may be calculated from a comparison of times of arrival for radio signals and the acoustic signals. The time of flight may be used to calculate the distance between the positioning node and secondary device.
Abstract:
A system and method for tracking aircraft, helicopters and/or other objects at an airfield using acoustics of the aircraft, helicopters and/or other objects. A method receives first acoustical data at a first sensor and second acoustical data is also received at a second sensor. The first and second sensors may be carried by a first structurally supportive body member. Based at least in part on the first acoustical data and the second acoustical data a range and a bearing of the aircraft is determined from a predetermined location at the airfield. The range and bearing can be determined by using a beam forming algorithm. Based on the range and the bearing, the method displays the location the aircraft on a display.
Abstract:
An optical ring resonator sensor array module for a passive SONAR system. The module includes a supporting structure; a silicon substrate mounted on the supporting structure, and a top plate mounted over the silicon structure. The silicon substrate includes an optical waveguide having an input and an output and a plurality of optical ring resonators distributed across the silicon substrate to form a two-dimensional pattern. Each optical ring resonator is positioned adjacent to the optical waveguide and each has a different predetermined diameter. The top plate includes a plurality of diaphragms, one for each of the plurality of optical ring resonators. The diaphragms are distributed on the top plate such that each of the plurality of diaphragms is positioned over an associated one of the plurality of optical ring resonators. In addition, each of the diaphragms is configured to flex in response to externally applied acoustical pressure.
Abstract:
An acoustic detection system is provided for determining the source of an acoustic wavefield. The system comprises multiple acoustic sensors, the sensors being configured to provide multiple different components of a vector from the source of the acoustic wavefield to the system.
Abstract:
In an embodiment, a transducer controller is configured to apply a damping signal to reduce energy stored in the transducer after the transducer has been driven with a drive signal to form a transmitted acoustic signal.
Abstract:
A disclosed example method involves determining, using a neural network at a stationary unit, a first distance of a first portable audio detector from the stationary unit, the first portable audio detector associated with a first panelist, the stationary unit located in proximity to the media presentation device. The example method also involves determining, using the neural network, a second distance of a second portable audio detector from the stationary unit, the second portable audio detector associated with a second panelist. In response to the first distance being less than a threshold distance, the media is credited as exposed to the first panelist. In response to the second distance being more than the threshold distance, the media is not credited as exposed to the second panelist.
Abstract:
A method and a device for high frequency acoustic spectrum imaging for an object over a field of view. A camera captures an image of the object. A raster with grids is created as an overlay on the captured image. A directional microphone detects high frequency acoustic waves emanating from the object. An acoustic data signal corresponding to the high frequency acoustic waves is generated by a microphone data processing unit. The coordinates of the focal point of the directional microphone on the grid of the raster is recorded and sent as a real-time feedback position signal to a processor for each measurement of the acoustic signal data. The processor plots a visual representation of the acoustic signal data mapping it to the corresponding coordinates on the raster and creates a high frequency acoustic spectrum image for the object by superimposing the raster on the captured image.
Abstract:
A system and method for orientation of an ultrasonic signal includes at least two emitters in a mobile device that includes an orientation sensor that can determine a device orientation. A receiver at a fixed, known point includes at least two microphones operable to receive an ultrasonic signal from the device. The mobile device can drive the emitters to produce an ultrasonic signal that is oriented towards the receiver. A location engine can establish a location of the mobile device using the time delay of arrival of an ultrasonic burst from the mobile device impinging on each microphone of the receiver. In response to the location and/or the orientation, the mobile device operable to drive the emitters to produce a signal that is oriented towards the receiver.
Abstract:
An apparatus and method is provided that utilizes sonar array discontinuities for increasing the directivity gain of a sonar system by increasing the ratio of trace wavelengths (replicated) to the length of a fixed array aperture. Impedance discontinuities, or blocking masses, are embedded in a matrix material of fixed length to create Bragg scattered longitudinal displacements of a wavelength. The longitudinal displacements are induced by an incident acoustic plane wave. This creates longitudinal replicas of the displacements, shifted in wave number, creating a scaled acoustic trace wavelength. The replicated trace wavelength is sampled and resolved, thereby increasing the directivity gain of a sonar system.