A first electronic device determines that a first trigger condition is satisfied, sends a first instruction to enable a first sound wave transmitter to send a first sound wave signal, and sends a second instruction to enable a second sound wave transmitter to send a second sound wave signal. A second electronic device sends a third instruction to enable a first sound wave receiver to receive the first sound wave signal and the second sound wave signal, calculates a first receiving start moment and a second receiving start moment, obtains first location information, determines second location information based on the first receiving start moment, the second receiving start moment, and the first location information, and sends the second location information to the first electronic device. The first electronic device updates third location information by using the second location information.

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.

An information processing device (1) includes receiving means (2) configured to receive audio information, first position information of a first user terminal, and first direction information of the first user terminal from the first user terminal, and receive second position information of a second user terminal and second direction information of the second user terminal from the second user terminal. The information processing device (1) further includes output means (3) configured to output the audio information, if a first position indicated by the first position information and a second position indicated by the second position information are within a predetermined distance, and if the second direction information is similar to the first direction information.

An information processing device (1) includes receiving means (2) configured to receive audio information, first position information of a first user terminal, and first direction information of the first user terminal from the first user terminal, and receive second position information of a second user terminal and second direction information of the second user terminal from the second user terminal. The information processing device (1) further includes output means (3) configured to output the audio information, if a first position indicated by the first position information and a second position indicated by the second position information are within a predetermined distance, and if the second direction information is similar to the first direction information.

A system includes first, second, and third microphones configured to receive sound waves from a source of the sound waves. The system includes a memory configured to store first, second, and third phase difference maps for the first and second microphones, the second and third microphones, and the third and first microphones. The system includes a processor configured to measure first, second, and third phase differences between the sound waves received from the source by the first and second microphones, the second and third microphones, and the third and first microphones; receive the first, second, and third phase difference maps from the memory; and identify a location of the source of the sound waves based on the first, second, and third phase differences and the first, second, and third phase difference maps for the first and second microphones, the second and third microphones, and the third and first microphones.

A system for locating a sound source includes at least four emitter/receiver pairs, each emitter/receiver pair of the at least four emitter/receiver pairs including a laser emitter and a receiver external to an enclosed structure. The laser directs a laser beam onto a respective reflector surface location on an outer surface of the structure, the respective reflector surface location being caused to vibrate due to sound waves generated from a sound source at a sound source location within the enclosed structure. The receiver receives vibrational signals from the laser beam on the surface at the respective reflector surface location and converting the vibrational signals to acoustic signals. A processor coupled to the emitter/receiver pairs for utilizing the acoustic signals to determine a time difference of arrival of the sound waves to the respective reflector surface locations to determine the sound source location based on the time difference of arrivals.

A system for locating a sound source includes at least four emitter/receiver pairs, each emitter/receiver pair of the at least four emitter/receiver pairs including a laser emitter and a receiver external to an enclosed structure. The laser directs a laser beam onto a respective reflector surface location on an outer surface of the structure, the respective reflector surface location being caused to vibrate due to sound waves generated from a sound source at a sound source location within the enclosed structure. The receiver receives vibrational signals from the laser beam on the surface at the respective reflector surface location and converting the vibrational signals to acoustic signals. A processor coupled to the emitter/receiver pairs for utilizing the acoustic signals to determine a time difference of arrival of the sound waves to the respective reflector surface locations to determine the sound source location based on the time difference of arrivals.

A sound or vibration source localization system with a master unit and a plurality of slave units. The master unit transmit a time synchronization signal via an RF link to the slave units. A microphone or vibration sensor in each of the slave units are used to record a short time sequence, e.g. 0.2-2 seconds, of sound or vibration time aligned with the time synchronization signal to ensure synchronous recording of the time sequences at all slave units. The slave unit transmit the recorded time aligned time sequences via an RF link along with a time stamp and an identification code to the master unit. The master unit has a processor system arranged to process the received time sequences from the slave units according to a lizard ear mimicking algorithm. Such type of algorithm provides a good direction estimate in response to two input signals recorded at different positions, even with a short time sequence. As a result, and preferably along with information regarding physical positions of the slave units, a sound source or vibration source localization estimate can be generated.

A sound or vibration source localization system with a master unit and a plurality of slave units. The master unit transmit a time synchronization signal via an RF link to the slave units. A microphone or vibration sensor in each of the slave units are used to record a short time sequence, e.g. 0.2-2 seconds, of sound or vibration time aligned with the time synchronization signal to ensure synchronous recording of the time sequences at all slave units. The slave unit transmit the recorded time aligned time sequences via an RF link along with a time stamp and an identification code to the master unit. The master unit has a processor system arranged to process the received time sequences from the slave units according to a lizard ear mimicking algorithm. Such type of algorithm provides a good direction estimate in response to two input signals recorded at different positions, even with a short time sequence. As a result, and preferably along with information regarding physical positions of the slave units, a sound source or vibration source localization estimate can be generated.