Low power wireless communication system employing magnetic control zones
First Claim
1. A wireless communication system for transmitting audio signals to a first location from a second location, the system comprising:
- first transmission means, disposed at said first location, for providing a control signal which varies in time, said first transmission means including a magnetic transmission element for transmitting said control signal;
first receiver means, disposed at said second location and including a magnetic receiving element magnetically coupled to said magnetic transmission element, for receiving said control signal;
second transmission means, disposed at said second location, for receiving an audio signal, said transmission means including at least one of a radio frequency transmitter and an infrared transmitter for transmitting said audio signal simultaneously with the reception of, and under the control of, the magnetically transmitted control signal; and
second receiver means, disposed at said first location and including at least one of a radio frequency receiver and an infrared receiver, for receiving said audio signal, wherein said second location comprises a portable communication device.
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Accused Products
Abstract
A cordless headset, requiring very low power using Time Variant Modulation (TVM) for reception of a magnetic signal and TVM of RF or infrared as the transmitter. The headset area or zone of operations is defined by the magnetic field that the headset operates within and uses a handshake protocol that takes advantage of the TVM fixed clock period. The headset communicates with a base station that includes a TVM transmitter and loop for transmitting a TVM signal to the cordless headset, and a RF or infrared receiver capable of receiving TVM signals from the headset. The base station also contains the headset protocol logic for controlling the headset transmission. The headset and base station receiver can both be fixed, mobile or portable and vary with respect to orientation and distance from each other. The receiver circuits in both base station and headset automatically adjust to the variance in signal strength.
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Citations
22 Claims
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1. A wireless communication system for transmitting audio signals to a first location from a second location, the system comprising:
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first transmission means, disposed at said first location, for providing a control signal which varies in time, said first transmission means including a magnetic transmission element for transmitting said control signal; first receiver means, disposed at said second location and including a magnetic receiving element magnetically coupled to said magnetic transmission element, for receiving said control signal; second transmission means, disposed at said second location, for receiving an audio signal, said transmission means including at least one of a radio frequency transmitter and an infrared transmitter for transmitting said audio signal simultaneously with the reception of, and under the control of, the magnetically transmitted control signal; and second receiver means, disposed at said first location and including at least one of a radio frequency receiver and an infrared receiver, for receiving said audio signal, wherein said second location comprises a portable communication device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A communication system for transmitting a control signal from a first location to a second location and for transmitting an audio signal from the second location to the first location, the system comprising:
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first transmission means, disposed at said first location, for receiving said control signal and for providing a first pulse sequence modulated in the time domain by said control signal, said transmission means including a magnetic transmission element for transmitting said pulse sequence; first receiver means, disposed at said second location and including a magnetic receiving element magnetically coupled to said magnetic transmission element, for receiving said pulse sequence and for demodulating said pulse sequence to reproduce said control signal; second transmission means, disposed at said second location, for transmitting said audio simultaneously with the reception of, and under the control of, the magnetically transmitted control signal, said transmission means including at least one of a radio frequency transmission element and an infrared transmission element; and second receiver means, disposed at said first location, for receiving said audio signal, wherein said second location comprises a portable communication device. - View Dependent Claims (12, 13, 14)
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15. A method for transmitting an audio signal to a first location from a second location, comprising the steps of:
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magnetically transmitting a time varying control signal over a short distance from said first location so as to define a control zone around said first location; receiving said control signal at said second location within said control zone; transmitting said audio signal to said first location, employing at least one of a radio frequency transmitter and an infrared transmitter, simultaneously with said step of magnetically transmitting; receiving said audio signal at said first location; and controlling said audio signal transmission step employing said control signal received at said second location. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A portable cordless transmitter, comprising:
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means for receiving an input audio signal; transmission means, including at least one of a radio frequency transmitter or infrared transmitter, for transmitting said audio signal; and control means, including a magnetic receiver element, for receiving a magnetically transmitted time varying control signal and controlling said transmission means in response to said control signal, wherein said control signal comprises a clock signal and wherein said control means controls said transmission means in response to detection of said clock signal. - View Dependent Claims (22)
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Specification