USRE39982E1 - Diversity circuit for magnetic communication system - Google Patents
Diversity circuit for magnetic communication system Download PDFInfo
- Publication number
- USRE39982E1 USRE39982E1 US09/881,645 US88164501A USRE39982E US RE39982 E1 USRE39982 E1 US RE39982E1 US 88164501 A US88164501 A US 88164501A US RE39982 E USRE39982 E US RE39982E
- Authority
- US
- United States
- Prior art keywords
- signal
- transducers
- phase
- transducer
- signals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000004891 communication Methods 0.000 title claims abstract description 38
- 230000005540 biological transmission Effects 0.000 claims abstract description 33
- 238000012545 processing Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 58
- 230000001939 inductive effect Effects 0.000 claims description 50
- 230000003213 activating effect Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 3
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 230000006698 induction Effects 0.000 description 9
- 229910000859 α-Fe Inorganic materials 0.000 description 9
- 230000001413 cellular effect Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000004075 alteration Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013479 data entry Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/3827—Portable transceivers
- H04B1/385—Transceivers carried on the body, e.g. in helmets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive loop type
-
- H04B5/48—
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/084—Equal gain combining, only phase adjustments
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
- H04M1/6041—Portable telephones adapted for handsfree use
- H04M1/6058—Portable telephones adapted for handsfree use involving the use of a headset accessory device connected to the portable telephone
- H04M1/6066—Portable telephones adapted for handsfree use involving the use of a headset accessory device connected to the portable telephone including a wireless connection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
- H02J7/00034—Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
Abstract
Description
Claims (65)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/881,645 USRE39982E1 (en) | 1995-05-18 | 2001-06-14 | Diversity circuit for magnetic communication system |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US44401795A | 1995-05-18 | 1995-05-18 | |
US08/696,812 US5912925A (en) | 1995-05-18 | 1996-08-13 | Diversity circuit for magnetic communication system |
US09/881,645 USRE39982E1 (en) | 1995-05-18 | 2001-06-14 | Diversity circuit for magnetic communication system |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/696,812 Reissue US5912925A (en) | 1995-05-18 | 1996-08-13 | Diversity circuit for magnetic communication system |
Publications (1)
Publication Number | Publication Date |
---|---|
USRE39982E1 true USRE39982E1 (en) | 2008-01-01 |
Family
ID=24798653
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/696,812 Ceased US5912925A (en) | 1995-05-18 | 1996-08-13 | Diversity circuit for magnetic communication system |
US09/881,645 Expired - Lifetime USRE39982E1 (en) | 1995-05-18 | 2001-06-14 | Diversity circuit for magnetic communication system |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/696,812 Ceased US5912925A (en) | 1995-05-18 | 1996-08-13 | Diversity circuit for magnetic communication system |
Country Status (2)
Country | Link |
---|---|
US (2) | US5912925A (en) |
WO (1) | WO1998007244A2 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090041241A1 (en) * | 2007-08-08 | 2009-02-12 | Radeum, Inc. | Near field communications system having enhanced security |
US8929809B2 (en) | 2011-03-22 | 2015-01-06 | Radeum, Inc. | Techniques for wireless communication of proximity based content |
US9400985B2 (en) | 2010-11-08 | 2016-07-26 | Radeum, Inc. | Techniques for wireless communication of proximity based content |
US9560505B2 (en) | 2011-03-23 | 2017-01-31 | Freelinc Technologies Inc. | Proximity based social networking |
US9621227B2 (en) | 2014-08-29 | 2017-04-11 | Freelinc Technologies | Proximity boundary based communication using radio frequency (RF) communication standards |
US10164685B2 (en) | 2014-12-31 | 2018-12-25 | Freelinc Technologies Inc. | Spatially aware wireless network |
US10594368B1 (en) * | 2019-01-31 | 2020-03-17 | Capital One Services, Llc | Array and method for improved wireless communication |
Families Citing this family (38)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6223029B1 (en) * | 1996-03-14 | 2001-04-24 | Telefonaktiebolaget Lm Ericsson (Publ) | Combined mobile telephone and remote control terminal |
US6591100B1 (en) * | 1998-11-19 | 2003-07-08 | Ericsson Inc. | Cellular communication device with scanning receiver and continuous mobile communication system employing same |
FR2787654A1 (en) * | 1998-12-21 | 2000-06-23 | Valeo Securite Habitacle | LOW FREQUENCY COMMUNICATION DEVICE BY MAGNETIC COUPLING |
FR2792129B1 (en) | 1999-04-07 | 2006-07-28 | Valeo Securite Habitacle | PORTABLE SIGNAL RECEIVER WITH MULTIPLE ANTENNAS |
GB0004121D0 (en) * | 2000-02-23 | 2000-04-12 | Koninkl Philips Electronics Nv | Communication system and a transmitter for use in the system |
GB0004123D0 (en) * | 2000-02-23 | 2000-04-12 | Koninkl Philips Electronics Nv | Communication system and a receiver for use in the system |
US7532901B1 (en) | 2001-03-16 | 2009-05-12 | Radeum, Inc. | Methods and apparatus to detect location and orientation in an inductive system |
US7142811B2 (en) * | 2001-03-16 | 2006-11-28 | Aura Communications Technology, Inc. | Wireless communication over a transducer device |
AU2002247355A1 (en) * | 2001-03-16 | 2002-10-03 | Aura Communications, Inc. | Techniques for inductive communication systems |
EP1286477A1 (en) * | 2001-08-06 | 2003-02-26 | EM Microelectronic-Marin SA | Portable receiver with two antennas |
GB2379121A (en) * | 2001-08-07 | 2003-02-26 | James Edward Aman | Hands-free kit with inductive link |
JP2003152442A (en) * | 2001-11-15 | 2003-05-23 | Alps Electric Co Ltd | Arranging method of receiving antenna |
DE60123091T2 (en) * | 2001-12-28 | 2007-04-05 | Em Microelectronic-Marin S.A. | Portable receiver with two antennas |
US6745054B2 (en) | 2002-01-31 | 2004-06-01 | Nokia Corporation | User interface assembly, and associated method, for alerting placement of a call to a mobile station |
DE60207547T2 (en) * | 2002-07-31 | 2006-08-10 | Em Microelectronic-Marin S.A., Marin | Portable receiver with reduced dispersion |
AT413449B (en) * | 2003-01-15 | 2006-03-15 | Seidel Elektronik Gmbh Nfg Kg | SEARCH, IN PARTICULAR FOR LOCATING DISPOSED PEOPLE IN LAWINEN, AND METHOD FOR OPERATING A SEARCH |
US7158754B2 (en) * | 2003-07-01 | 2007-01-02 | Ge Medical Systems Global Technology Company, Llc | Electromagnetic tracking system and method using a single-coil transmitter |
US7818036B2 (en) * | 2003-09-19 | 2010-10-19 | Radeum, Inc. | Techniques for wirelessly controlling push-to-talk operation of half-duplex wireless device |
US7149552B2 (en) * | 2003-09-19 | 2006-12-12 | Radeum, Inc. | Wireless headset for communications device |
US7818037B2 (en) * | 2003-09-19 | 2010-10-19 | Radeum, Inc. | Techniques for wirelessly controlling push-to-talk operation of half-duplex wireless device |
US7933554B2 (en) * | 2004-11-04 | 2011-04-26 | The United States Of America As Represented By The Secretary Of The Army | Systems and methods for short range wireless communication |
US20080014865A1 (en) * | 2006-06-16 | 2008-01-17 | Pinnacle Peak Holding Corporation (Dba Setcom Corp.) | Radio and public address accessory system with wireless interface |
DE102006029717A1 (en) * | 2006-06-28 | 2008-01-03 | Siemens Audiologische Technik Gmbh | Hearing device with orthogonally arranged coils |
US8010171B2 (en) * | 2006-09-01 | 2011-08-30 | Pinnacle Peak Holding Corporation | Wireless portable radio vehicle communication system |
US20080070499A1 (en) * | 2006-09-19 | 2008-03-20 | Hydro Technologies, Inc. | Magnetic communication through metal barriers |
US20080174500A1 (en) * | 2007-01-23 | 2008-07-24 | Microsoft Corporation | Magnetic communication link with diversity antennas |
NO328038B1 (en) | 2007-06-01 | 2009-11-16 | Freebit As | Improved uncleanness |
US20080299904A1 (en) * | 2007-06-04 | 2008-12-04 | Seagate Technology Llc | Wireless communication system |
GB0724703D0 (en) * | 2007-12-19 | 2008-01-30 | Rhodes Mark | Co-located transmit-receive antenna system |
JP2011517581A (en) | 2008-03-10 | 2011-06-16 | メディンゴ・リミテッド | Injection and sensor device with battery charging mechanism and data transfer mechanism |
US7903041B2 (en) * | 2008-05-01 | 2011-03-08 | Lockheed Martin Corporation | Magnetic antenna apparatus and method for generating a magnetic field |
US9048884B2 (en) * | 2008-05-02 | 2015-06-02 | Lockheed Martin Corporation | Magnetic based short range communications device, system and method |
US8024623B2 (en) * | 2008-11-03 | 2011-09-20 | Oracle America, Inc. | Misalignment compensation for proximity communication |
WO2011016090A1 (en) * | 2009-08-06 | 2011-02-10 | 富士通株式会社 | Phase interpolator, semiconductor device, and method for testing the same |
EP2466554B1 (en) * | 2010-12-15 | 2018-04-04 | Huf Hülsbeck & Fürst GmbH & Co. KG | Mobile ID transmitter for keyless systems |
US9490886B2 (en) * | 2012-02-27 | 2016-11-08 | Qualcomm Incorporated | RF beamforming in phased array application |
JP2016127442A (en) * | 2015-01-05 | 2016-07-11 | 株式会社リコー | Radio communication device and mobile terminal device |
EP3153056B1 (en) | 2015-09-30 | 2018-12-05 | Apple Inc. | Case with magnetic over-center mechanism |
Citations (49)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1164281A (en) | 1965-09-18 | 1969-09-17 | Emi Ltd | Improvements in or relating to Telephone User's Local Apparatus. |
US3617890A (en) | 1967-01-12 | 1971-11-02 | Sumitomo Electric Industries | Induction radio system for vehicles |
US3898565A (en) | 1971-03-05 | 1975-08-05 | Mishima Kosan Co Ltd | Magnetic wave communication system |
US4061972A (en) | 1973-12-03 | 1977-12-06 | Victor Robert Burgess | Short range induction field communication system |
US4117271A (en) | 1977-01-10 | 1978-09-26 | The United States Of America As Represented By The Secretary Of The Navy | Inductive communication system |
US4160952A (en) | 1978-05-12 | 1979-07-10 | Bell Telephone Laboratories, Incorporated | Space diversity receiver with combined step and continuous phase control |
FR2431227A1 (en) | 1978-07-12 | 1980-02-08 | Dassault Electronique | Inductive coupling for aircrew helmet microphones and earphones - has coil coupling via twin loops in seat headrest and similar loops in back of helmet |
US4298874A (en) | 1977-01-17 | 1981-11-03 | The Austin Company | Method and apparatus for tracking objects |
US4320342A (en) * | 1978-09-15 | 1982-03-16 | U.S. Philips Corporation | Magnet coil arrangement for generating linear magnetic gradient fields |
US4334316A (en) | 1979-10-31 | 1982-06-08 | Nippon Electric Co., Ltd. | Pre-detection maximal ratio combining system for diversity reception of radio frequency signals |
US4373207A (en) | 1980-12-17 | 1983-02-08 | Bell Telephone Laboratories, Incorporated | Space diversity signal combiner |
US4442434A (en) | 1980-03-13 | 1984-04-10 | Bang & Olufsen A/S | Antenna circuit of the negative impedance type |
US4489330A (en) | 1981-10-01 | 1984-12-18 | Rion Kabushiki Kaisha | Electromagnetic induction coil antenna |
US4513412A (en) | 1983-04-25 | 1985-04-23 | At&T Bell Laboratories | Time division adaptive retransmission technique for portable radio telephones |
US4542532A (en) | 1984-03-09 | 1985-09-17 | Medtronic, Inc. | Dual-antenna transceiver |
US4584707A (en) | 1985-01-22 | 1986-04-22 | Dataproducts New England, Inc. | Cordless communications system |
US4600829A (en) | 1984-04-02 | 1986-07-15 | Walton Charles A | Electronic proximity identification and recognition system with isolated two-way coupling |
DE3603098A1 (en) | 1985-02-03 | 1987-01-08 | Svaetopluk Radakovic | A device having a number of receiving coils for avoiding a loss of reception due to the directional patterns of the transmitting and receiving coil in a signal transmission with magnetic field |
US4642786A (en) | 1984-05-25 | 1987-02-10 | Position Orientation Systems, Ltd. | Method and apparatus for position and orientation measurement using a magnetic field and retransmission |
US4647722A (en) | 1984-09-28 | 1987-03-03 | Aisin Seiki Kabushiki Kaisha | Land mobile telephone system |
US4654883A (en) | 1983-10-18 | 1987-03-31 | Iwata Electric Co., Ltd. | Radio transmitter and receiver device having a headset with speaker and microphone |
US4669109A (en) | 1985-02-26 | 1987-05-26 | Cheviller Jean Pierre Le | Telephone apparatus with a fixed telephone station coupled to a mobile and detachable handset |
US4733402A (en) | 1987-04-23 | 1988-03-22 | Signatron, Inc. | Adaptive filter equalizer systems |
GB2197160A (en) | 1986-10-01 | 1988-05-11 | Dataproducts New England Inc | Cordless communications system |
US4752776A (en) | 1986-03-14 | 1988-06-21 | Enguvu Ag/Sa/Ltd. | Identification system |
EP0296092A2 (en) | 1987-06-19 | 1988-12-21 | George Geladakis | Arrangement for wireless earphones without batteries and electronic circuits, applicable in audio-systems or audio-visual systems of all kinds |
US4918737A (en) | 1987-07-07 | 1990-04-17 | Siemens Aktiengesellschaft | Hearing aid with wireless remote control |
US4939791A (en) | 1987-12-09 | 1990-07-03 | Blaupunkt Werke Gmbh | Diversity radio receiver for use with multiple antenna, particularly car radio |
US4967695A (en) | 1989-06-23 | 1990-11-06 | Invisible Fence Company, Inc. | System for controlling the movement of an animal |
US5054112A (en) | 1988-03-16 | 1991-10-01 | Seiko Instruments Inc. | Electronic data collection system |
US5097484A (en) | 1988-10-12 | 1992-03-17 | Sumitomo Electric Industries, Ltd. | Diversity transmission and reception method and equipment |
WO1992017991A1 (en) | 1991-04-01 | 1992-10-15 | Resound Corporation | Inconspicuous communication method utilizing remote electromagnetic drive |
US5276920A (en) | 1990-01-18 | 1994-01-04 | Nokia Mobile Phones Ltd. | Antenna selection switch for a diversity antenna |
US5276686A (en) | 1990-10-17 | 1994-01-04 | Kabushiki Kaisha Toshiba | Mobile radio communication system having mobile base and portable devices as a mobile station |
GB2277422A (en) | 1993-03-23 | 1994-10-26 | Universal Exchange Limited | A headset accessory for a mobile telephone set |
DE9309032U1 (en) | 1993-06-17 | 1994-11-03 | Lachnitt Klaus | Telephone device |
US5390357A (en) | 1991-08-28 | 1995-02-14 | Nec Corporation | Power saving diversity receiver |
US5437057A (en) | 1992-12-03 | 1995-07-25 | Xerox Corporation | Wireless communications using near field coupling |
US5453686A (en) | 1993-04-08 | 1995-09-26 | Polhemus Incorporated | Pulsed-DC position and orientation measurement system |
US5457386A (en) * | 1991-11-26 | 1995-10-10 | Hitachi, Ltd. | Multiple-coil adopting a quadrature detection method applied thereto and a signal processing circuit employing the same in an MRI apparatus in a vertical magnetic system |
EP0700184A2 (en) | 1994-09-02 | 1996-03-06 | Mitsubishi Denki Kabushiki Kaisha | Diversity receiver |
US5553312A (en) | 1994-06-20 | 1996-09-03 | Acs Wireless, Inc. | Data transfer and communication network |
US5568516A (en) | 1993-07-02 | 1996-10-22 | Phonic Ear Incorporated | Very low power cordless headset system |
DE29609349U1 (en) | 1996-03-12 | 1996-10-24 | Chen Jinsaun | Transmitter-receiver arrangement for use in an audio system |
WO1996037052A1 (en) | 1995-05-18 | 1996-11-21 | Aura Communications, Inc. | Short-range magnetic communication system |
US5581707A (en) | 1994-07-27 | 1996-12-03 | Psc, Inc. | System for wireless collection of data from a plurality of remote data collection units such as portable bar code readers |
US5600330A (en) | 1994-07-12 | 1997-02-04 | Ascension Technology Corporation | Device for measuring position and orientation using non-dipole magnet IC fields |
US5615229A (en) | 1993-07-02 | 1997-03-25 | Phonic Ear, Incorporated | Short range inductively coupled communication system employing time variant modulation |
US5649306A (en) | 1994-09-16 | 1997-07-15 | Motorola, Inc. | Portable radio housing incorporating diversity antenna structure |
-
1996
- 1996-08-13 US US08/696,812 patent/US5912925A/en not_active Ceased
-
1997
- 1997-08-08 WO PCT/US1997/013935 patent/WO1998007244A2/en active Application Filing
-
2001
- 2001-06-14 US US09/881,645 patent/USRE39982E1/en not_active Expired - Lifetime
Patent Citations (52)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1164281A (en) | 1965-09-18 | 1969-09-17 | Emi Ltd | Improvements in or relating to Telephone User's Local Apparatus. |
US3617890A (en) | 1967-01-12 | 1971-11-02 | Sumitomo Electric Industries | Induction radio system for vehicles |
US3898565A (en) | 1971-03-05 | 1975-08-05 | Mishima Kosan Co Ltd | Magnetic wave communication system |
US4061972A (en) | 1973-12-03 | 1977-12-06 | Victor Robert Burgess | Short range induction field communication system |
US4117271A (en) | 1977-01-10 | 1978-09-26 | The United States Of America As Represented By The Secretary Of The Navy | Inductive communication system |
US4298874A (en) | 1977-01-17 | 1981-11-03 | The Austin Company | Method and apparatus for tracking objects |
US4160952A (en) | 1978-05-12 | 1979-07-10 | Bell Telephone Laboratories, Incorporated | Space diversity receiver with combined step and continuous phase control |
FR2431227A1 (en) | 1978-07-12 | 1980-02-08 | Dassault Electronique | Inductive coupling for aircrew helmet microphones and earphones - has coil coupling via twin loops in seat headrest and similar loops in back of helmet |
US4320342A (en) * | 1978-09-15 | 1982-03-16 | U.S. Philips Corporation | Magnet coil arrangement for generating linear magnetic gradient fields |
US4334316A (en) | 1979-10-31 | 1982-06-08 | Nippon Electric Co., Ltd. | Pre-detection maximal ratio combining system for diversity reception of radio frequency signals |
US4442434A (en) | 1980-03-13 | 1984-04-10 | Bang & Olufsen A/S | Antenna circuit of the negative impedance type |
US4373207A (en) | 1980-12-17 | 1983-02-08 | Bell Telephone Laboratories, Incorporated | Space diversity signal combiner |
US4489330A (en) | 1981-10-01 | 1984-12-18 | Rion Kabushiki Kaisha | Electromagnetic induction coil antenna |
US4513412A (en) | 1983-04-25 | 1985-04-23 | At&T Bell Laboratories | Time division adaptive retransmission technique for portable radio telephones |
US4654883A (en) | 1983-10-18 | 1987-03-31 | Iwata Electric Co., Ltd. | Radio transmitter and receiver device having a headset with speaker and microphone |
US4542532A (en) | 1984-03-09 | 1985-09-17 | Medtronic, Inc. | Dual-antenna transceiver |
US4600829A (en) | 1984-04-02 | 1986-07-15 | Walton Charles A | Electronic proximity identification and recognition system with isolated two-way coupling |
US4642786A (en) | 1984-05-25 | 1987-02-10 | Position Orientation Systems, Ltd. | Method and apparatus for position and orientation measurement using a magnetic field and retransmission |
US4647722A (en) | 1984-09-28 | 1987-03-03 | Aisin Seiki Kabushiki Kaisha | Land mobile telephone system |
US4584707A (en) | 1985-01-22 | 1986-04-22 | Dataproducts New England, Inc. | Cordless communications system |
US4747158A (en) | 1985-01-22 | 1988-05-24 | Data Products New England, Inc. | Cordless communications system |
DE3603098A1 (en) | 1985-02-03 | 1987-01-08 | Svaetopluk Radakovic | A device having a number of receiving coils for avoiding a loss of reception due to the directional patterns of the transmitting and receiving coil in a signal transmission with magnetic field |
US4669109A (en) | 1985-02-26 | 1987-05-26 | Cheviller Jean Pierre Le | Telephone apparatus with a fixed telephone station coupled to a mobile and detachable handset |
US4752776A (en) | 1986-03-14 | 1988-06-21 | Enguvu Ag/Sa/Ltd. | Identification system |
GB2197160A (en) | 1986-10-01 | 1988-05-11 | Dataproducts New England Inc | Cordless communications system |
US4733402A (en) | 1987-04-23 | 1988-03-22 | Signatron, Inc. | Adaptive filter equalizer systems |
EP0296092A2 (en) | 1987-06-19 | 1988-12-21 | George Geladakis | Arrangement for wireless earphones without batteries and electronic circuits, applicable in audio-systems or audio-visual systems of all kinds |
US4918737A (en) | 1987-07-07 | 1990-04-17 | Siemens Aktiengesellschaft | Hearing aid with wireless remote control |
US4939791A (en) | 1987-12-09 | 1990-07-03 | Blaupunkt Werke Gmbh | Diversity radio receiver for use with multiple antenna, particularly car radio |
US5054112A (en) | 1988-03-16 | 1991-10-01 | Seiko Instruments Inc. | Electronic data collection system |
US5097484A (en) | 1988-10-12 | 1992-03-17 | Sumitomo Electric Industries, Ltd. | Diversity transmission and reception method and equipment |
US4967695A (en) | 1989-06-23 | 1990-11-06 | Invisible Fence Company, Inc. | System for controlling the movement of an animal |
US5276920A (en) | 1990-01-18 | 1994-01-04 | Nokia Mobile Phones Ltd. | Antenna selection switch for a diversity antenna |
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Also Published As
Publication number | Publication date |
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US5912925A (en) | 1999-06-15 |
WO1998007244A2 (en) | 1998-02-19 |
WO1998007244A3 (en) | 1998-05-14 |
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