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US 12,671,959 B2Granted
Low level smartphone audio and sensor clock synchronization
AssigneeSonitor Technologies AS
InventorsWilfred Edwin Booij, Kjetil Haslum, Fritjof Boger Engelhardtsen, Endre Bakka
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Abstract
An approach to obtain low latency association of the audio clock in a smartphone with an incoming RF message is to use an interrupt driven routine, where the receipt of the RF message preamble generates an interrupt that reads the audio clock counter since the start of the audio session. In some embodiments such an approach may be implemented on the specialized processing cores found in smartphones that control RF communication, sensor or audio processing.
Claims19
A method associated with a real-time location system, the method comprising:
- receiving a global clock signal at a server;
- associating a reference clock with the received global clock signal;
- transmitting an acoustic signal from a location transmitter at a time synchronized with the reference clock;
- receiving by a mobile device a clock signal associated with the global clock signal;
- receiving by the mobile device the acoustic signal;
- time-stamping, using an audio clock, the received acoustic signal;
- synchronizing the audio clock with the reference clock using the global clock signal;
- receiving data from an inertial motion sensor located in the mobile device;
- receiving timing information associated with the received data;
- associating the timing information and the audio clock, and
- determining a location of the mobile device based on the synchronizing the audio clock and based on fusing the data from the inertial motion sensor and the associated timing information.
8 more elements
Dependencies are inferred from the claim text.