Very low power cordless headset system
First Claim
1. A two-way wireless communication system for transmitting audio signals between a first location and a second location, the system comprising:
- first transmission means, disposed at said first location, for receiving a first audio signal, said first transmission means including a time variant modulation clock generator for generating a time variant modulation clock signal, modulation means, responsive to the time variant modulation clock signal for time variant modulating said first audio signal to produce a time variant modulated first audio signal, and a magnetic transmission element for transmitting said time variant modulated first audio signal;
first receiver means, disposed at said second location and including a magnetic receiving element magnetically coupled to said magnetic transmission element, for receiving and demodulating said time variant modulated first audio signal;
second transmission means, disposed at said second location, for receiving and transmitting a second audio signal, said transmission means including at least one of a RF transmitter and an infrared transmitter for transmitting said second audio signal; and
second receiver means, disposed at said first location and including at least one of a RF receiver and an infrared receiver, for receiving said second audio signal, wherein at least one of said first and second locations 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.
113 Citations
9 Claims
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1. A two-way wireless communication system for transmitting audio signals between a first location and a second location, the system comprising:
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first transmission means, disposed at said first location, for receiving a first audio signal, said first transmission means including a time variant modulation clock generator for generating a time variant modulation clock signal, modulation means, responsive to the time variant modulation clock signal for time variant modulating said first audio signal to produce a time variant modulated first audio signal, and a magnetic transmission element for transmitting said time variant modulated first audio signal; first receiver means, disposed at said second location and including a magnetic receiving element magnetically coupled to said magnetic transmission element, for receiving and demodulating said time variant modulated first audio signal; second transmission means, disposed at said second location, for receiving and transmitting a second audio signal, said transmission means including at least one of a RF transmitter and an infrared transmitter for transmitting said second audio signal; and second receiver means, disposed at said first location and including at least one of a RF receiver and an infrared receiver, for receiving said second audio signal, wherein at least one of said first and second locations comprises a portable communication device. - View Dependent Claims (2)
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3. A two-way wireless communication system for transmitting audio signals between a first location and a second location, the system comprising:
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first transmission means, disposed at said first location, for receiving a first audio signal, said first transmission means including a time variant modulation clock generator for generator for generating a first time variant modulation clock signal, modulation means, responsive to the first time variant modulation clock signal for time variant modulating said first audio signal to produce a time variant modulated first audio signal, and a magnetic transmission element for transmitting said time variant modulated first audio signal; first receiver means, disposed at said second location and including a magnetic receiving element magnetically coupled to said magnetic transmission element, for receiving and demodulating said time variant modulated first audio signal; second transmission means, disposed at said second location, for receiving a seconds audio signal and for time variant modulating said second audio signal, said transmission means including at least one of a RF transmitter and an infrared transmitter for transmitting said time variant modulated second audio signal; and second receiver means, disposed at said first location and including at least one of a RF receiver and an infrared receiver, for receiving and demodulating said time variant modulated second audio signal, wherein the first location comprises a base station and the second location comprises a portable cordless headset. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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Specification