Patent US5774791A successfully refreshed from Google Patents.
US5774791A
Expired / Lapsed
US
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Low power wireless communication system employing magnetic control zones
Assignee: Phonic Ear Inc
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Filing: 1996-10-18
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Granted: 1998-06-30
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Expires: 2016-10-18
Abstract
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.
Inventors
- 👤 Gene Michael Strohallen
- 👤 Robert Francis Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:27
CPC Classifications
H; H04; H04B; H04B5/00; H04B5/40; H04B5/48; H04L; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/4902; H04B5/20; H04B5/24; H04B5/26; H04M; H04M1/00; H04M1/72; H04M1/725; H04M1/737; H04R; H04R25/00; H04R25/55; H04R25/554; H04R1/00; H04R1/10; H04R2225/00; H04R2225/021; H04R2225/025; H04R2420/00; H04R2420/07; H04R25/50; H04R25/505; H04R3/00; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
162 words
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.
Claim 2
Dependent Claim
162 words
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.
Claim 3
Dependent Claim
24 words
The wireless communication system according to claim 1, wherein the first location comprises a base station and the second location comprises a cordless headset.
Claim 4
Dependent Claim
24 words
The wireless communication system according to claim 1, wherein the first location comprises a base station and the second location comprises a cordless handset.
Claim 5
Dependent Claim
43 words
The wireless communication system according to claim 1, wherein the control signal comprises a first clock signal and wherein the first transmission means includes: a clock generator for generating the first clock signal, said magnetic transmission element receiving and transmitting the clock signal.
Claim 6
Dependent Claim
41 words
The wireless communication system according to claim 4, wherein the first receiver means includes: clock recovery means, responsive to said received first clock signal, for producing a second clock signal, said second clock signal being synchronous with said first clock signal.
Claim 7
Dependent Claim
46 words
The wireless communication system according to claim 5, wherein the control signal further comprises a pilot tone and wherein the first transmission means further includes a pilot tone generator for generating and transmitting a pilot tone to said first receiver means via said magnetic transmission element.
Claim 8
Dependent Claim
29 words
The wireless communication system according to claim 6, wherein the first receiver means further includes a pilot tone detector for detecting said pilot tone transmitted by said transmission means.
Claim 9
Dependent Claim
40 words
The wireless communication system according to claim 7, wherein said pilot tone detector includes means for comparing said detected pilot tone with said second clock signal to determine if said detected pilot tone and said second clock signal are synchronous.
Claim 10
Dependent Claim
27 words
The wireless communication system according to claim 8, wherein said pilot tone detector includes means, responsive to said detected pilot tone, for disabling said second transmission means.
Claim 11
Dependent Claim
30 words
A communication system as set out in claim 5, further comprising means for enabling said second transmission means when said first clock signal is detected by said first receiving means.
Claim 12
Dependent Claim
180 words
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: 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.
Claim 13
Dependent Claim
180 words
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: 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.
Claim 14
Dependent Claim
30 words
A communication system as set out in claim 11, further comprising means, coupled to said first receiver means, for controlling said second transmission means in response to said control signal.
Claim 15
Dependent Claim
26 words
A communication system as set out in claim 12, wherein said means for controlling enables said transmission means in response to detection of said control signal.
Claim 16
Dependent Claim
17 words
A communication system as set out in claim 11, wherein said control signal comprises a clock signal.
Claim 17
Independent Claim
109 words
A method for transmitting an audio signal to a first location from a second location, comprising the steps of: 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.
Claim 18
Independent Claim
109 words
A method for transmitting an audio signal to a first location from a second location, comprising the steps of: 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.
Claim 19
Dependent Claim
26 words
A method as set out in claim 15, wherein said control zone is a zone less than or equal to 100 meters from said first location.
Claim 20
Dependent Claim
16 words
A method as set out in claim 15, wherein said control signal is a clock signal.
Claim 21
Dependent Claim
24 words
A method as set out in claim 17, wherein said controlling step comprises enabling said audio signal transmission step upon receiving said clock signal.
Claim 22
Dependent Claim
33 words
A method as set out in claim 15, wherein said control signal comprises a pilot tone and wherein said controlling step comprises disabling said audio signal transmission step upon receiving said pilot tone.
Claim 23
Dependent Claim
26 words
A method as set out in claim 15, further comprising the step of time variant modulating said control signal prior to magnetically transmitting said control signal.
Claim 24
Dependent Claim
84 words
A portable cordless transmitter, comprising: 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.
Claim 25
Dependent Claim
84 words
A portable cordless transmitter, comprising: 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.
Claim 26
Dependent Claim
20 words
A transmitter as set out in claim 21, wherein said means for receiving an input audio signal comprises a microphone.
References Cited (Backward Citations)
US3689885A
Cited
US3711651A
Cited
US4259746A
Cited
US4524335A
Cited
US4462113A
Cited
US5302954A
Cited
US5054112A
Cited
US5241410A
Cited
US5175869A
Cited
US5345231A
Cited
US5590417A
Cited
US5568516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-06-29 | 2001-12-29 | 2002-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-29 | 2005-12-29 | 2006-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-29 | 2009-12-29 | 2010-06-30 | $7700.00 | Window Closed / Lapsed |