A system and method use electric potential measurements to locate and characterize passing projectiles, including advanced data processing methods to reject background noise and determine projectile speed, preferentially incorporating acoustic-based measurements to provide additional benefits.

A first electronic device indicates at least two second electronic devices to enable respective sound recording functions, and indicates a third electronic device to send an ultrasonic signal. After enabling the sound recording functions, the at least two second electronic devices determine a relative location relationship between each of the at least two second electronic devices and the third electronic device based on respectively detected ultrasonic signals, and then send the relative location relationship between each of the at least two second electronic devices and the third electronic device to the first electronic device. Finally, the first electronic device sends the relative location relationship between each of the at least two second electronic devices and the third electronic device to the at least two second electronic devices and the third electronic device.

A first electronic device indicates at least two second electronic devices to enable respective sound recording functions, and indicates a third electronic device to send an ultrasonic signal. After enabling the sound recording functions, the at least two second electronic devices determine a relative location relationship between each of the at least two second electronic devices and the third electronic device based on respectively detected ultrasonic signals, and then send the relative location relationship between each of the at least two second electronic devices and the third electronic device to the first electronic device. Finally, the first electronic device sends the relative location relationship between each of the at least two second electronic devices and the third electronic device to the at least two second electronic devices and the third electronic device.

Methods, apparatus, systems and articles of manufacture are disclosed to improve detection of audio signatures. An example apparatus includes at least one memory, instructions in the apparatus, and processor circuitry to execute the instructions to: determine a first time difference of arrival for a first audio sensor of a meter and a second audio sensor of the meter based on a first audio recording from the first audio sensor and a second audio recording from the second audio sensor; determine a second time difference of arrival for the first audio sensor and a third audio sensor of the meter based on the first audio recording and a third audio recording from the third audio sensor; determine a match by comparing the first time difference of arrival to i) a first virtual source time difference of arrival and ii) a second virtual source time difference of arrival; in response to determining that the first time difference of arrival matches the first virtual source time difference of arrival, identify a first virtual source location as the location of a media presentation device presenting media; and remove the second audio recording to reduce a computational burden on the processor.

Methods, apparatus, systems and articles of manufacture are disclosed to improve detection of audio signatures. An example apparatus includes at least one memory, instructions in the apparatus, and processor circuitry to execute the instructions to: determine a first time difference of arrival for a first audio sensor of a meter and a second audio sensor of the meter based on a first audio recording from the first audio sensor and a second audio recording from the second audio sensor; determine a second time difference of arrival for the first audio sensor and a third audio sensor of the meter based on the first audio recording and a third audio recording from the third audio sensor; determine a match by comparing the first time difference of arrival to i) a first virtual source time difference of arrival and ii) a second virtual source time difference of arrival; in response to determining that the first time difference of arrival matches the first virtual source time difference of arrival, identify a first virtual source location as the location of a media presentation device presenting media; and remove the second audio recording to reduce a computational burden on the processor.

A system and method is provided for registering outputs from a plurality of remote positional data sources, the system having: a plurality of positional data sources disposed on a plurality of units providing a plurality of types of positional data relative to at least one commonly tracked object held as a local positional data source; a processor disposed on a unit configured to process the positional data from each positional data source and apply a filter to the positional data; and the processor configured to weigh the positional data based on a probability of that a positional datum in the positional data is accurate and using weighted positional data to identify an absolute location of the commonly tracked object.

A system and method use electric potential measurements to locate and characterize passing projectiles, including advanced data processing methods to reject background noise and determine projectile speed, preferentially incorporating acoustic-based measurements to provide additional benefits.

A system and method use electric potential measurements to locate and characterize passing projectiles, including advanced data processing methods to reject background noise and determine projectile speed, preferentially incorporating acoustic-based measurements to provide additional benefits.

Examples of the disclosure relate to localization that can be implemented with a low number of nodes. In examples of the disclosure an apparatus for acoustic localization comprises means for detecting two or more acoustic signals originating from two or more acoustic sources. The apparatus also comprises means for generating a first category of parameters for the two or more detected acoustic signals and generating a second category parameters for the two or more detected acoustic signals. At least, the first category of parameters and the second category of parameters are used to generate a timing parameter for the two or more detected acoustic signals. At least the timing parameter and the first category of parameters are used to determine an estimate of a location of an object associated with the two or more detected acoustic signals.

Examples of the disclosure relate to localization that can be implemented with a low number of nodes. In examples of the disclosure an apparatus for acoustic localization comprises means for detecting two or more acoustic signals originating from two or more acoustic sources. The apparatus also comprises means for generating a first category of parameters for the two or more detected acoustic signals and generating a second category parameters for the two or more detected acoustic signals. At least, the first category of parameters and the second category of parameters are used to generate a timing parameter for the two or more detected acoustic signals. At least the timing parameter and the first category of parameters are used to determine an estimate of a location of an object associated with the two or more detected acoustic signals.