US5726893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellular telephone with voice-in-data modem
Assignee: Exelis Inc
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Filing: 1994-11-23
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Granted: 1998-03-10
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Expires: 2014-11-23
Abstract
Abstract A GPS system has a plurality of satellites transmitting time and location data over radio frequency signals which enable a mobile GPS receiver on the ground to determine its position, includes a source of satellite data message block containing the ephemeris and time modes of the GPS satellites which is independent of the satellites, and an independent cellular telephone channel having a voice channel, a data-in-voice modem including a notch filtering circuit in the voice channel (transmits and receive) and circuits for inserting and retrieving data in and from the notch for accessing said satellite data message block and controller means connecting said satellite message data block to said mobile GPS receiver.
Inventors
- 👤 Leonard Schuchman
- 👤 Ronald Bruno
- 👤 Charles Moses
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:09
CPC Classifications
G; G01; G01S; G01S19/00; G01S19/01; G01S19/13; G01S19/23; G01S19/235; G01S19/24; G01S19/25; G01S19/258; G01S19/29; G01S5/00; G01S5/0009; G01S5/0018; G01S5/0027; G01S5/02; G01S5/0205; G01S5/021; H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/185; H04B7/1853; H04B7/18545; H04B7/18547; H04B7/1855; H04B7/18552; G01S2205/00; G01S2205/001; G01S2205/008
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
129 words
A modem for use in a cellular mobile subscriber telephone in a cellular telephone system having one or more cell sites servicing a plurality of cellular mobile subscriber telephones, said modem comprising a transmit channel and a receive channel, each of said channels having first filter means to receive voice signals and second filter means to transmit voice signals on said transmit channel, said second filter means having only one frequency notch in said transmit and receive channels; an interface for receiving binary data from a source of G.P.S. data; means to transmit said binary data from said source within said only one frequency notch, and mode control means for selectively enabling said source of binary data and said only one frequency notch to allow data to be transmitted.
Claim 2
Dependent Claim
129 words
A modem for use in a cellular mobile subscriber telephone in a cellular telephone system having one or more cell sites servicing a plurality of cellular mobile subscriber telephones, said modem comprising a transmit channel and a receive channel, each of said channels having first filter means to receive voice signals and second filter means to transmit voice signals on said transmit channel, said second filter means having only one frequency notch in said transmit and receive channels; an interface for receiving binary data from a source of G.P.S. data; means to transmit said binary data from said source within said only one frequency notch, and mode control means for selectively enabling said source of binary data and said only one frequency notch to allow data to be transmitted.
Claim 3
Dependent Claim
34 words
The modem defined in claim 1 wherein said binary data is constituted by a plurality of frequency shift keyed (FSK) tones and said FSK tones are about 1650 Hz and about 1959 Hz, respectively.
Claim 4
Dependent Claim
20 words
The modem defined in claim 1 wherein said second filter means in said transmit and receive channels are digital filters.
Claim 5
Dependent Claim
31 words
The modem defined in claim 1 wherein said modem is mounted in the trunk of a vehicle, and said cellular mobile telephone is coupled to said modem by a radio link.
Claim 6
Dependent Claim
166 words
In a position location system wherein a plurality of radio stations transmit time and location data over radio frequency signals which enable a mobile position location receiver on the ground to determine its position and generate location data signals, the improvement comprising: said mobile position location system including a modem, said modem including a transmit portion which receives voice data, and a tone generator for receiving data for transmission, a bandstop filter for providing a frequency notch in said voice channel, summer means connected to said tone generator and said bandstop filter for combining said location data signals with said voice data and; receive portion having a filter delay line for receiving combined voice and data signals on said modem, a bandstop filter for extracting the data signals, and a data decisions circuit connected to the bandstop filter for comparing and smoothing said data signals; and a digital mode control means for selectively controlling said bandstop filters in said transmit and receive portions of said modem.
Claim 7
Dependent Claim
166 words
In a position location system wherein a plurality of radio stations transmit time and location data over radio frequency signals which enable a mobile position location receiver on the ground to determine its position and generate location data signals, the improvement comprising: said mobile position location system including a modem, said modem including a transmit portion which receives voice data, and a tone generator for receiving data for transmission, a bandstop filter for providing a frequency notch in said voice channel, summer means connected to said tone generator and said bandstop filter for combining said location data signals with said voice data and; receive portion having a filter delay line for receiving combined voice and data signals on said modem, a bandstop filter for extracting the data signals, and a data decisions circuit connected to the bandstop filter for comparing and smoothing said data signals; and a digital mode control means for selectively controlling said bandstop filters in said transmit and receive portions of said modem.
Claim 8
Dependent Claim
182 words
A modem for use in a subscriber telephone in a cellular telephone system having one or more cell sites servicing a plurality of subscriber telephones with data utilization devices, said modem comprising transmit and receive channels, said receive channel comprising a first filter delay line to receive voice and data signals, a first bandstop filter for transmitting a voice input to said subscriber telephones and data signals to said data utilization devices, respectively; said transmit channel having a second filter delay line connected to receive voice signals from said cellular telephone, a second bandstop filter connected to said filter delay line for providing a frequency notch in said voice signals from said cellular phones; an interface for receiving; of binary data from a source of G.P.S. data; and means for converting to binary data from said source of binary data to tone signals and for transmitting said tone signals within said frequency notch and; control means for converting for selectively controlling said first and second bandstop filters to allow data to be transmitted and received in said transmit and receive channels, respectively.
Claim 9
Dependent Claim
182 words
A modem for use in a subscriber telephone in a cellular telephone system having one or more cell sites servicing a plurality of subscriber telephones with data utilization devices, said modem comprising transmit and receive channels, said receive channel comprising a first filter delay line to receive voice and data signals, a first bandstop filter for transmitting a voice input to said subscriber telephones and data signals to said data utilization devices, respectively; said transmit channel having a second filter delay line connected to receive voice signals from said cellular telephone, a second bandstop filter connected to said filter delay line for providing a frequency notch in said voice signals from said cellular phones; an interface for receiving; of binary data from a source of G.P.S. data; and means for converting to binary data from said source of binary data to tone signals and for transmitting said tone signals within said frequency notch and; control means for converting for selectively controlling said first and second bandstop filters to allow data to be transmitted and received in said transmit and receive channels, respectively.
References Cited (Backward Citations)
US1968106A
Cited
US2613279A
Cited
US3436487A
Cited
US3715758A
Cited
US3781794A
Cited
US3795877A
Cited
US3889264A
Cited
US3938045A
Cited
US4054088A
Cited
US4225967A
Cited
US4229620A
Cited
US4445118A
Cited
US4425665A
Cited
US4512013A
Cited
US4642633A
Cited
USRE34036E
Cited
US4871987A
Cited
US5045861A
Cited
US4979188A
Cited
US4891650A
Cited
US5014206A
Cited
US5418849A
Cited
US5214641A
Cited
US5032845A
Cited
US5103459A
Cited
US5103459B1
Cited
US5043736B1
Cited
US5043736A
Cited
US5218618A
Cited
US5299132A
Cited
US5155689A
Cited
US5398190A
Cited
US5225842A
Cited
US5375166A
Cited
US5202829A
Cited
US5295156A
Cited
US5173710A
Cited
US5280295A
Cited
US5223844A
Cited
US5223844B1
Cited
US5410541A
Cited
US5218367A
Cited
US5361399A
Cited
US5300936A
Cited
US5418537A
Cited
US5327144A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-03-09 | 2001-09-08 | 2002-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-03-09 | 2005-09-08 | 2006-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-03-09 | 2009-09-08 | 2010-03-10 | $7700.00 | Window Closed / Lapsed |