Determining the distance and/or acoustic quality between a mobile device and a base unit
First Claim
1. A method of determining the distance and/or acoustic quality between a mobile device having a microphone and a speaker and a base unit comprising a microphone and a speaker, wherein the mobile device is configured to wirelessly communicate with the base unit and the base unit is configured to connect to a remote monitoring station via a communication network, the method comprising:
- receiving an acoustic signal by a microphone in one of said mobile device and base unit;
with a processor;
determining coefficients of an adaptive filter for removing a second signal from the received acoustic signal, the second signal corresponding to (a) an acoustic signal received by the microphone in the other one of said mobile device and base unit, or (b) a control signal used to control the speaker in the other one of said mobile device and base unit to output the acoustic signal, anddetermining the acoustic quality and/or the distance between the mobile device and the base unit based the determined coefficients.
1 Assignment
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Accused Products
Abstract
To determine the distance and/or acoustic quality between a mobile device and a base unit, an acoustic signal is received by a microphone in one of said mobile device and base unit. A correlation of a second signal with the received acoustic signal is determined. An acoustic quality and/or a distance between the mobile device and the base unit is determined based on one or more peaks in the result of the step of determining the correlation.
22 Citations
17 Claims
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1. A method of determining the distance and/or acoustic quality between a mobile device having a microphone and a speaker and a base unit comprising a microphone and a speaker, wherein the mobile device is configured to wirelessly communicate with the base unit and the base unit is configured to connect to a remote monitoring station via a communication network, the method comprising:
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receiving an acoustic signal by a microphone in one of said mobile device and base unit; with a processor; determining coefficients of an adaptive filter for removing a second signal from the received acoustic signal, the second signal corresponding to (a) an acoustic signal received by the microphone in the other one of said mobile device and base unit, or (b) a control signal used to control the speaker in the other one of said mobile device and base unit to output the acoustic signal, and determining the acoustic quality and/or the distance between the mobile device and the base unit based the determined coefficients. - View Dependent Claims (2, 3, 4, 5)
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6. A method of reducing power consumption of a mobile device having a microphone, a speaker, and an RF transmitter and receiver, the mobile device being configured to wirelessly communicate via the RF transmitter and receiver with a base device, the base device having a microphone, a speaker, and an RF transmitter and receiver which is configured to communicate with the mobile device RF transmitter and receiver and with a remote monitoring station, the method comprising:
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with the microphone in one of said mobile device and base device, receiving an acoustic signal; with a processor in one of the mobile device and the base device; determining a correlation of a second signal with the received acoustic signal, the second signal corresponding to (a) an acoustic signal received by the microphone in the other one of said mobile device and the base device, or (b) a control signal used to control the speaker in the other one of said mobile device and the base device to output the acoustic signal, determining the acoustic quality and/or the distance between the mobile device and the base device based on the correlation, and deactivating a speaker of the mobile device in response to determining that the mobile device is closer than a threshold distance to the base device or the acoustic quality is greater than a threshold value. - View Dependent Claims (7, 8, 9)
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10. A system, comprising:
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a mobile device having a microphone and a speaker; a base device having a microphone and a speaker; wherein one of the mobile device and base unit is arranged to receive, by its microphone, an acoustic signal; a processor configured to; determine a correlation of a second signal with the received acoustic signal, the second signal corresponding to (a) an acoustic signal received by the microphone in the other one of said mobile device and base device, or (b) a control signal used to control the speaker in the other one of said mobile device and base device to output the acoustic signal; and determine the acoustic quality and/or the distance between the mobile device and the base device based on at least one of (i) a dispersion around a detected peak and (ii) a reverberation time around the detected peak. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification