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.

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.

A system comprises at least three microphones for generating audio signals representing a sound generated by a sound source, each microphone having a respective identifier (ID), a memory, and a processor. The processor is configured for: storing records in the memory to be referenced using indexes, the indexes based on a time stamp when the audio signals are generated and frequency components of the audio signals, each record containing the respective ID of one of the at least three microphones and a time when the sound is first detected by the microphone corresponding to the ID; matching indexes of records from the memory corresponding to the sound for each of the at least three microphones; and computing a location of the sound source based on the respective arrival times of the sound stored in the records having matching indices by synthetic aperture passive lateration

A system comprises at least three microphones for generating audio signals representing a sound generated by a sound source, each microphone having a respective identifier (ID), a memory, and a processor. The processor is configured for: storing records in the memory to be referenced using indexes, the indexes based on a time stamp when the audio signals are generated and frequency components of the audio signals, each record containing the respective ID of one of the at least three microphones and a time when the sound is first detected by the microphone corresponding to the ID; matching indexes of records from the memory corresponding to the sound for each of the at least three microphones; and computing a location of the sound source based on the respective arrival times of the sound stored in the records having matching indices by synthetic aperture passive lateration

A method for recognizing infrasound events includes detecting infrasonic source using one or more microphone arrays each having three equally-spaced infrasound microphones. The method includes identifying, via a data acquisition system (DAS), a level of coherence of the detected infrasonic acoustic signals from each possible pair of microphones and recognizing the infrasound source using the coherence and a time history of the detected signals. The method may include estimating source properties via the DAS, including a magnitude, azimuth angle, and elevation angle, and executing a control action in response to the estimated properties. A system includes the array and the DAS. The array may be positioned above or below ground, and may be connected to one or more aircraft in some embodiments.

The present invention relates to a technical field of voice interaction, especially to a voice direction searching system and the method thereof. The present invention utilizes a microphone array to collect voice signals made by an acoustic source, and utilizes multiple MEMS microphones to identify an MEMS microphone closest to the acoustic source, so that the voice direction searching system can accurately identify voice direction signals.

The present invention relates to a technical field of voice interaction, especially to a voice direction searching system and the method thereof. The present invention utilizes a microphone array to collect voice signals made by an acoustic source, and utilizes multiple MEMS microphones to identify an MEMS microphone closest to the acoustic source, so that the voice direction searching system can accurately identify voice direction signals.

In an object detection apparatus, a first region definition unit defines a first object region including a first detection point representing a relative position of a first object detected by a millimeter-wave radar with respect to a reference point in an XY-plane. An X-axis direction of the XY-plane is a vehicle widthwise direction, and a Y-axis direction of the XY-plane is a vehicle lengthwise direction. A second region definition unit defines a second object region including a second detection point representing a relative position of a second object detected based on a captured image with respect to the reference point. A region size modification unit modifies the size of the first region in the presence of axial misalignment of the radar. A determination unit determines that the first and second objects are the same if there is an overlap of the first and second object regions in the XY-plane.

In an object detection apparatus, a first region definition unit defines a first object region including a first detection point representing a relative position of a first object detected by a millimeter-wave radar with respect to a reference point in an XY-plane. An X-axis direction of the XY-plane is a vehicle widthwise direction, and a Y-axis direction of the XY-plane is a vehicle lengthwise direction. A second region definition unit defines a second object region including a second detection point representing a relative position of a second object detected based on a captured image with respect to the reference point. A region size modification unit modifies the size of the first region in the presence of axial misalignment of the radar. A determination unit determines that the first and second objects are the same if there is an overlap of the first and second object regions in the XY-plane.

Systems and methods are disclosed for autonomous joint detection-classification of acoustic sources of interest. Localization and tracking from unmanned marine vehicles are also described. Based on receiving acoustic signals originating above or below the surface, a processor can process the acoustic signals to determine the target of interest associated with the acoustic signal. The methods and systems autonomously and jointly detect and classify a target of interest. A target track can be generated corresponding to the locations of the detected target of interest. A classifier can be used representing spectral characteristics of a target of interest.