Telecommunications – Radiotelephone system – Special service
Reexamination Certificate
2006-03-07
2006-03-07
Tsang, Fan (Department: 2645)
Telecommunications
Radiotelephone system
Special service
C367S128000, C340S691500, C379S090010
Reexamination Certificate
active
07010290
ABSTRACT:
A first, transmitting, device transmits a digitized data message using a short range radio link followed by digital data representing a digitized acoustic signal, such as a tone. Simultaneously, or with a predetermined time delay, the transmitting device emits an acoustic version of the same signal using an acoustic transducer such as a loudspeaker. A second, receiving, device receives the data message and the digitized acoustic signal via the short range radio link and receives the acoustic version of the signal via a microphone, which converts the acoustic signal to a second digitized version of the acoustic signal. Digital signal processing circuits then correlate the second digitized signal received acoustically with the digitized acoustic signal received over the short range radio link to determine a time difference of arrival. The time difference is corrected for any predetermined delay between the radio and the acoustic signal emissions at the transmitter and predetermined processing delays in the receiver. Once the time delay is determined, the receiving device can determine its distance from the transmitting device using the difference between the speed of sound and the speed of radio propagation.
REFERENCES:
patent: 4313183 (1982-01-01), Saylors
patent: 4746912 (1988-05-01), Clifford et al.
patent: 5541354 (1996-07-01), Farrett et al.
patent: 6201802 (2001-03-01), Dean
patent: 6404703 (2002-06-01), Burrell
patent: 6418203 (2002-07-01), Marcie
patent: 6662020 (2003-12-01), Aaro et al.
patent: 2003/0005612 (2003-01-01), Andreason
patent: 1111949 (2001-06-01), None
patent: 2692363 (1993-12-01), None
patent: WO 91 10919 (1991-07-01), None
patent: WO 01 46916 (2001-06-01), None
Elahee Md S.
Ericsson Inc.
Moore & Van Allen PLLC
Stephens Gregory A.
Tsang Fan
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