System, apparatus, and method for proximity detection
First Claim
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1. A mobile communication device, comprising:
- a transmitter configured to transmit a periodic ultrasound signal;
a receiver configured to receive the periodic ultrasound signal, the receiver located remote from the transmitter;
a first filter coupled to the receiver and configured to filter the periodic ultrasound signal based on a frame length of the periodic ultrasound signal; and
a detection logic circuit coupled to the first filter and configured to determine a power level of the periodic ultrasound signal, a signal to noise ratio of the periodic ultrasound signal, and whether the receiver is located in an enclosed environment based on the power level and the signal to noise ratio;
wherein the first filter is configured to filter the periodic ultrasound signal by using a matrix wherein each column of the matrix represents one of a first frame, a second frame, a third frame, a fourth frame, a fifth frame, a sixth frame, and a seventh frame and each row of the matrix represents one of a first 1024 samples, a second 1024 samples, a third 1024 samples, a fourth 1024 samples, a fifth 1024 samples, a sixth 1024 samples, and a seventh 1024 samples, respectively.
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Abstract
A mobile communication device equipped for proximity detection may include a transmitter that emits a periodic ultrasound signal, a receiver that detects the periodic ultrasound signal, an intra-frame filter that filters the detected periodic ultrasound signal based on a frame length of the detected periodic ultrasound signal, and a detector that determines a power level of the filtered periodic ultrasound signal to detect if the receiver is located in an undesirable location.
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Citations
28 Claims
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1. A mobile communication device, comprising:
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a transmitter configured to transmit a periodic ultrasound signal; a receiver configured to receive the periodic ultrasound signal, the receiver located remote from the transmitter; a first filter coupled to the receiver and configured to filter the periodic ultrasound signal based on a frame length of the periodic ultrasound signal; and a detection logic circuit coupled to the first filter and configured to determine a power level of the periodic ultrasound signal, a signal to noise ratio of the periodic ultrasound signal, and whether the receiver is located in an enclosed environment based on the power level and the signal to noise ratio; wherein the first filter is configured to filter the periodic ultrasound signal by using a matrix wherein each column of the matrix represents one of a first frame, a second frame, a third frame, a fourth frame, a fifth frame, a sixth frame, and a seventh frame and each row of the matrix represents one of a first 1024 samples, a second 1024 samples, a third 1024 samples, a fourth 1024 samples, a fifth 1024 samples, a sixth 1024 samples, and a seventh 1024 samples, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A computer program product residing on a processor-executable non-transitory storage medium, the computer program product comprising processor-executable instructions configured to cause:
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a transmitter to transmit a periodic ultrasound signal; a receiver to receive the periodic ultrasound signal, the receiver located remote from the transmitter; a first filter, coupled to the receiver, to filter the periodic ultrasound signal based on a frame length of the periodic ultrasound signal; and a detection logic circuit, coupled to the first filter, to determine a power level of the periodic ultrasound signal, a signal to noise ratio of the periodic ultrasound signal, and whether the receiver is located in an enclosed environment based on the power level and the signal to noise ratio; wherein the first filter is configured to filter the periodic ultrasound signal by using a matrix wherein each column of the matrix represents one of a first frame, a second frame, a third frame, a fourth frame, a fifth frame, a sixth frame, and a seventh frame and each row of the matrix represents one of a first 1024 samples, a second 1024 samples, a third 1024 samples, a fourth 1024 samples, a fifth 1024 samples, a sixth 1024 samples, and a seventh 1024 samples, respectively. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for detection of an enclosed environment, the method comprising:
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transmitting a periodic ultrasound signal from a transmitter; receiving the periodic ultrasound signal by a receiver, the receiver located remote from the transmitter; filtering of the periodic ultrasound signal by a first filter based on a frame length of the periodic ultrasound signal;
determining whether a threshold power level is exceeded in the periodic ultrasound signal;determining whether a threshold signal to noise ratio is exceeded in the periodic ultrasound signal; and determining whether the receiver is in the enclosed environment based on a power level and a signal to noise ratio of the periodic ultrasound signal; and preventing an initiation of a communication session based upon the determination of whether the receiver is in the enclosed environment; wherein the first filter is configured to filter the periodic ultrasound signal by using a matrix wherein each column of the matrix represents one of a first frame, a second frame, a third frame, a fourth frame, a fifth frame, a sixth frame, and a seventh frame and each row of the matrix represents one of a first 1024 samples, a second 1024 samples, a third 1024 samples, a fourth 1024 samples, a fifth 1024 samples, a sixth 1024 samples, and a seventh 1024 samples, respectively. - View Dependent Claims (22, 23, 24, 25)
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26. A system for detection of an enclosed environment, the system comprising:
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a transmitter configured to transmit a periodic ultrasound signal with a frequency in a transmitted pattern range; a receiver configured to receive the periodic ultrasound signal, the receiver located remote from the transmitter; a first filter coupled to the receiver and configured to filter the periodic ultrasound signal based on a frame length of the periodic ultrasound signal; a second filter coupled to the first filter and configured to filter the periodic ultrasound signal between a frequency range of the transmitted pattern range; and a detection logic circuit coupled to the second filter and configured to determine a power level of the periodic ultrasound signal, a signal to noise ratio of the periodic ultrasound signal, and whether the receiver is located in the enclosed environment based on the power level and the signal to noise ratio; wherein the first filter is configured to filter the periodic ultrasound signal by using a matrix wherein each column of the matrix represents one of a first frame, a second frame, a third frame, a fourth frame, a fifth frame, a sixth frame, and a seventh frame and each row of the matrix represents one of a first 1024 samples, a second 1024 samples, a third 1024 samples, a fourth 1024 samples, a fifth 1024 samples, a sixth 1024 samples, and a seventh 1024 samples, respectively. - View Dependent Claims (27, 28)
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Specification