Top 100 US Patents in Transmission Systems
section h - electricity > electric communication technique > transmission
Sorted by IPQ® Score, an objective measure of patent quality. View scores and methodology at PatentRatings.com. You can also view all by publication date instead.
US5953368 (A), filed
May 20, 1997
, published
Sep 14, 1999
- AXONN CORP
A remote power meter monitoring system using spread spectrum transmitters, fast frequency shift keying, spread spectrum receivers and a computer. The spread spectrum transmitter uses a chip code generator, preamble register, address register data register and...
US5768269 (A), filed
Aug 25, 1995
, published
Jun 16, 1998
- TERAYON CORP
A method and apparatus for carrying out synchronous codivision multiple access (SCDMA) communication of multiple channels of digital data over a shared transmission media such as a cable television system coaxial cable, a fiber optic or copper conductor...
US5029183 (A), filed
Jun 29, 1989
, published
Jul 02, 1991
- SYMBOL TECHNOLOGIES INC
US5235633 (A), filed
Dec 26, 1991
, published
Aug 10, 1993
- JONES SCOTT L
A cellular telephone system includes a plurality of cell sites and a mobile telephone switching office. Call management, including selection of a cell site most appropriate for a call associated with a mobile unit, are made based on the geographic location of...
US6389002 (B1), filed
Sep 21, 1999
, published
May 14, 2002
- INTERDIGITAL TECH CORP
A spread-spectrum CDMA communications system for communicating data between a plurality of users to a plurality of spread-spectrum units. The spread-spectrum communications system is located within a same geographical region as occupied by an existing FDMA,...
US7215984 (B2), filed
May 04, 2004
, published
May 08, 2007
- MASIMO CORP
The present invention involves method and apparatus for analyzing measured signals that are modeled as containing primary and secondary portions. Coefficients relate the two signals according to a model defined in accordance with the present invention. In one...
US6493563 (B1), filed
Nov 22, 2000
, published
Dec 10, 2002
- INTERDIGITAL TECH CORP
A system and method of controlling transmission power during the establishment of a channel in a CDMA communication system utilize the transmission of a short code from a subscriber unit to a base station during initial power ramp-up. The short code is a...
US6244512 (B1), filed
Aug 25, 1998
, published
Jun 12, 2001
- INTERMEC IP CORP
A hand-held data collection device with a user interface surface that is wider than its handgrip area. Also, a hand-held data collection device with an upwardly facing surface containing a user interface and a side surface containing a plurality of actuators....
US5619503 (A), filed
Jan 11, 1994
, published
Apr 08, 1997
- ERICSSON GE MOBILE INC
The invention relates to a radio communication system and method for minimizing co-channel interference. The system and method employ a matrix processor to separate signals received from, or transmitted to, a plurality of mobile units. The coefficients of the...
US6621854 (B1), filed
Jan 15, 1993
, published
Sep 16, 2003
- LOCKHEED CORP
An assembly of simultaneously transmitted electrically generated signals is disclosed, which contains a subset of binary spreading-code sequences that are members of a larger set of binary spreading-code sequences available to a particular node of a multi-node...
US5142550 (A), filed
Dec 28, 1990
, published
Aug 25, 1992
- SYMBOL TECHNOLOGIES INC
A packet data transmission system is used to link a number of remote hand-held data-gathering units such as bar code readers to a central computer which maintains a database management system. Data packets are sent from the remote units by an RF link to...
US5799010 (A), filed
Jun 27, 1996
, published
Aug 25, 1998
- INTERDIGITAL TECH CORP
A multiple access, spread-spectrum communication system processes a plurality of information signals received by a Radio Carrier Station (RCS) over telecommunication lines for simultaneous transmission over a radio frequency (RF) channel as a code-division-mul...
US7308110 (B2), filed
Feb 26, 2003
, published
Dec 11, 2007
- DIGIMARC CORP
An image is marked by making slight changes to pixel values. These changes are essentially imperceptible on human scrutiny, but detectable by computer analysis. Such markings have applications in identifying ownership of images (including video), and also in...
US4304001 (A), filed
Jan 24, 1980
, published
Dec 01, 1981
- FORNEY INTERNATIONAL
A control system for controlling an industrial process includes a plurality of remotely located process control units (remotes) each coupled to an associated input/output device(s) and adapted to communicate with one another through a dual channel communicatio...
US6206830 (B1), filed
Nov 17, 1999
, published
Mar 27, 2001
- MASIMO CORP
A signal processor which acquires a first signal, including a first desired signal portion and a first undesired signal portion, and a second signal, including a second desired signal portion and a second undesired signal portion, wherein the first and second...
US5648982 (A), filed
Sep 09, 1994
, published
Jul 15, 1997
- OMNIPOINT CORP
A technique for modulating and demodulating CPM spread spectrum signals and variations of CPM spread spectrum signals. A transmitter divides a signal data stream into a plurality of data streams (such as I and Q data streams), independently modulates the I and...
US6700990 (B1), filed
Sep 29, 1999
, published
Mar 02, 2004
- DIGIMARC CORP
To decode a digital watermark from an image notwithstanding geometrical corruption of the image (e.g., scale, rotation, etc.), a Fourier-Mellin transform is advantageously used. In a particular method, an image is transformed to the spatial frequency domain....
US5377183 (A), filed
Apr 11, 1994
, published
Dec 27, 1994
- ERICSSON GE MOBILE COMMUNICAT
A Code Division Multiple Access (CDMA) communication system which contains a calling channel which is used to inform silent mobiles that they are being called. In the system, the calling channel is chosen to be the strongest overlapping signal so that it...
US6351499 (B1), filed
Dec 15, 1999
, published
Feb 26, 2002
- IOSPAN WIRELESS INC
A method of maximizing a communication parameter, such as data capacity, signal quality or throughput of a channel between a transmit unit with M transmit antennas and a receive unit with N receive antennas and a communication system such as a wireless network...
US5933421 (A), filed
Feb 06, 1997
, published
Aug 03, 1999
- AT T WIRELESS SERVICES INC
The high quality PCS communications are enabled in environments where adjacent PCS service bands operate with out-of-band harmonics that would otherwise interfere with the system's operation. The highly bandwidth-efficient communications method combines a form...
US5479441 (A), filed
Jan 18, 1994
, published
Dec 26, 1995
- SYMBOL TECHNOLOGIES INC
A packet data transmission system is used to link a number of remote hand-held data-gathering units such as bar code readers to a central computer which maintains a database management system. Data packets are sent from the remote units by an RF link to...
US5510800 (A), filed
Sep 06, 1994
, published
Apr 23, 1996
- UNIV CALIFORNIA
A bi-static radar configuration measures the direct time-of-flight of a transmitted RF pulse and is capable of measuring this time-of-flight with a jitter on the order of about one pico-second, or about 0.01 inch of free space distance for an electromagnetic...
US7460507 (B2), filed
Feb 20, 2004
, published
Dec 02, 2008
- BROADCOM CORP
A packet-based, hierarchical communication system, arranged in a spanning tree configuration, is described in which wired and wireless communication networks exhibiting substantially different characteristics are employed in an overall scheme to link portable...
US7043052 (B2), filed
Jun 04, 2002
, published
May 09, 2006
- DIGIMARC CORP
Security of photographic identification documents is enhanced by embedding within the photographic image encoded information that may be correlated to other information pertaining to the individual represented by the image, such other information being, for...
US6985600 (B2), filed
Mar 15, 2001
, published
Jan 10, 2006
- DIGIMARC CORP
Stationery, or other printable media, is encoded with a digital watermark. The watermark is not conspicuous to a human observer of the media, yet conveys plural bits of auxiliary information when optically scanned and digitally processed. The watermark can be...
US7471659 (B2), filed
May 09, 2003
, published
Dec 30, 2008
- QUALCOMM INC
A system and method for determining 1xEV-DO availability for a packet data call in a wireless device is presented. When the wireless device receives a request to initiate a packet data call, the device determines if it currently has access to a preferred...
US6219694 (B1), filed
May 29, 1998
, published
Apr 17, 2001
- RES IN MOTION LTD
A system and method for pushing information from a host system to a mobile data communication device upon sensing a triggering event is disclosed. A redirector program operating at the host system enables a user to continuously redirect certain user-selected...
US6567533 (B1), filed
Apr 27, 2000
, published
May 20, 2003
- DIGIMARC CORP
To permit scaling or rotation of an image to be discerned-even if the original image is not available-certain marker signals are steganographically encoded in the image. In one particular implementation, encoding is effected by adding an overlay signal to the...
US7099292 (B2), filed
Feb 08, 2002
, published
Aug 29, 2006
- INTERDIGITAL TECH CORP
A spread spectrum remote unit produces a message signal having message data. A reference signal is produced. The reference signal is used to recover the message data from a combined spread spectrum signal. The reference signal and the message signal is...
US6606051 (B1), filed
Oct 18, 1999
, published
Aug 12, 2003
- TIME DOMAIN CORP
A time domain communications system wherein a broadband of time-spaced signals, essentially monocycle-like signals, are derived from applying stepped-in-amplitude signals to a broadband antenna, for example, a reverse bicone antenna or a pulse-responsive...
US5841768 (A), filed
Jun 27, 1996
, published
Nov 24, 1998
- INTERDIGITAL TECH CORP
A system and method of controlling transmission power during the establishment of a channel in a CDMA communication system utilize the transmission of a short code from a subscriber unit to a base station during initial power ramp-up. The short code is a...
US6169759 (B1), filed
Mar 22, 1999
, published
Jan 02, 2001
- GOLDEN BRIDGE TECHNOLOGY
An improvement to a code-division-multiple-access (CDMA) system employing spread-spectrum modulation, with the CDMA system having a base station (BS) and a plurality of remote stations. The base station has a BS-spread-spectrum transmitter and a BS-spread-spec...
US5075697 (A), filed
Sep 18, 1990
, published
Dec 24, 1991
- NIPPON ELECTRIC CO
US7003132 (B2), filed
Apr 01, 2003
, published
Feb 21, 2006
- DIGIMARC CORP
Methods for embedding and reading auxiliary messages from image signals use embedded code signals modulated with the auxiliary message. These embedded ode signals may be used to convey hidden tracking codes in images, video and printed objects. The embedded...
US6496135 (B1), filed
Jun 01, 2001
, published
Dec 17, 2002
- UNIVERSAL ELECTRONICS INC
A universal remote control comprising a keyboard having a plurality of pushbuttons including a macro pushbutton and a library of codes and data for use in transmitting operating commands to a plurality of different home appliances of different manufacturers....
US7437131 (B2), filed
Nov 07, 2005
, published
Oct 14, 2008
- RICHWAVE TECHNOLOGY CORP
An active mixer with self-adaptive bias feedback is described and resolves a poor linearity, inconvenient design of a bias circuit, and other defects of a conventional mixer. The dual self-feedback bias structure according to this invention is used. The active...
US5553062 (A), filed
Jul 26, 1994
, published
Sep 03, 1996
- INTERDIGITAL COMMUNICATION COR
A spread-spectrum code division multiple access interference canceler system and method for reducing interference in a spread-spectrum CDMA receiver having N chip-code channels, with each of the N channels identified by a distinct chip-code signal. The...
US4977577 (A), filed
Nov 02, 1988
, published
Dec 11, 1990
- AXONN CORP
A wireless alarm system using spread spectrum transmitters, fast frequency shift keying, spread spectrum receivers and computer with a display. The spread spectrum transmitter includes an oscillator coupled to a microprocessor with chip code generation means,...
US6252909 (B1), filed
Feb 25, 1997
, published
Jun 26, 2001
- AWARE INC
A communication system for sending a sequence of symbols on a communication link. The system includes a transmitter for placing information indicative of the sequence of symbols on the communication link and a receiver for receiving the information placed on...
US6463410 (B1), filed
Sep 13, 1999
, published
Oct 08, 2002
- VICTOR COMPANY OF JAPAN
In an audio signal encoding apparatus, a first audio signal and a second audio signal are added into an addition-result signal. The first audio signal is subtracted from the second audio signal to generate a subtraction-result signal. A first difference signal...
US5663734 (A), filed
Mar 08, 1996
, published
Sep 02, 1997
- PRECISION TRACKING INC
A GPS receiver in one embodiment includes an antenna which receives GPS signals at an RF frequency from in view satellites; a downconverter coupled to the antenna for reducing the RF frequency of the received GPS signals to an intermediate frequency (IF); a...
US5841978 (A), filed
Jul 27, 1995
, published
Nov 24, 1998
- DIGIMARC CORP
A given data object can effectively contain both a graphical representation to a network user and embedded information, such as the URL address of another network node, thereby to permit the object itself to serve as an automated hot link. The underlying...
US7130087 (B2), filed
Jun 15, 2004
, published
Oct 31, 2006
- DIGIMARC CORP
Security documents (e.g. passports, currency, event tickets, and the like) are encoded to convey machine-readable multi-bit binary information (e.g., a digital watermark), usually in a manner not alerting human viewers that such information is present. The...
US5482036 (A), filed
May 26, 1994
, published
Jan 09, 1996
- MASIMO CORP
A signal processor which acquires a first signal, including a first desired signal portion and a first undesired signal portion, and a second signal, including a second desired signal portion and a second undesired signal portion, wherein the first and second...
US5008900 (A), filed
Aug 14, 1989
, published
Apr 16, 1991
- INT MOBILE MACHINES
A subscriber unit for wireless communication with a base station in a wireless subscriber communication system includes a FIR chip, a DIF (digital intermediate frequency) chip, a single processor chip and a radio. The processor chip transcodes a digital voice...
US6020881 (A), filed
Feb 18, 1997
, published
Feb 01, 2000
- SUN MICROSYSTEMS
An intuitive graphical user interface is based upon a geographic map structure, and includes a system for controlling remote external electronic devices. In the defined graphical user interface, each Space of the geographic map structure is rendered on a touch...
US6618429 (B2), filed
Oct 02, 2002
, published
Sep 09, 2003
- OUALCOMM INC
A system and method for communicating information signals using spread spectrum communication techniques. PN sequences are constructed that provide orthogonality between the users so that mutual interference will be reduced, allowing higher capacity and better...
US5548226 (A), filed
Jun 30, 1994
, published
Aug 20, 1996
- HITACHI LTD
A signal transmitting circuit includes one or more circuit blocks having a driving circuit and an intra-block transmission line for transmitting a signal produced by the driving circuit, one or more circuit blocks having a receiving circuit and an intra-block...
US7440416 (B2), filed
Dec 15, 2003
, published
Oct 21, 2008
- BROADCOM CORP
A hierarchical communication system, arranged in a spanning tree configuration, is described in which wired and wireless communication networks exhibiting substantially different characteristics are employed in an overall scheme to link portable or mobile...
US7242675 (B2), filed
Jul 24, 2002
, published
Jul 10, 2007
- INTERDIGITAL TECH CORP
A spread-spectrum code division multiple access interference canceller employed by a remote terminal for reducing interference in a direct sequence CDMA receiver having N chip-code channels. The interference canceller includes a plurality of correlators or...
US7286684 (B2), filed
Jun 11, 2003
, published
Oct 23, 2007
- DIGIMARC CORP
A two dimensional pattern design for secure documents serves as both a machine readable code and an aesthetic part of the documents' design. A method for generating the design generates a variable auxiliary message comprising message values and maps the...
US5500756 (A), filed
Feb 26, 1993
, published
Mar 19, 1996
- HITACHI LTD
An optical repeater for realizing transmission of supervisory information of an optical fiber transmission system without the output power of an optical fiber amplifier being reduced, wherein a supervisory optical transmitter and optical receiver with a...
US5363403 (A), filed
Apr 22, 1993
, published
Nov 08, 1994
- INTERDIGITAL TECH CORP
A spread-spectrum code division multiple access interference canceler for reducing interference in a direct sequence CDMA receiver having N chip-code channels. The interference canceler includes a plurality of correlators or matched filters, a plurality of...
US6868076 (B2), filed
May 09, 2001
, published
Mar 15, 2005
- INTERDIGITAL TECH CORP
A plurality of channels are received as a received signal. Each channel is associated with a code. For each of the plurality of channels, others of the plurality of channels are subtracted from the received signal and a result of that subtracting is despread...
US5878339 (A), filed
Feb 06, 1998
, published
Mar 02, 1999
- GTE MOBILE COMM SERVINC
A cellular radiotelephone system (10) includes mobile stations (28) which may be remotely programmed from a customer activation system (12) to effect activation and other programming needs. Mobile stations (28) are manufactured in a blank form that causes them...
USRE40281 (E1), filed
Nov 23, 2004
, published
Apr 29, 2008
- AWARE INC
?delete-start id="DEL-S-00001" date="20080429" ?A communication system for sending a sequence of symbols on a communication link. The system includes a transmitter for placing information indicative of the sequence of symbols on the communication link and a...
US6546488 (B2), filed
Sep 21, 1998
, published
Apr 08, 2003
- HUGHES ELECTRONICS CORP
A method and apparatus for broadcasting newsgroup information to a plurality of users uses a news server, which is in communication with the Internet, a newscast transmitter, a satellite gateway, and a subscriber station. The news server gathers newsgroup...
US5056109 (A), filed
Nov 07, 1989
, published
Oct 08, 1991
- QUALCOMM INC
A power control system for a cellular mobile telephone system in which system users communicate information signals between one another via at least one cell site using code division multiple access spread spectrum communication signals. The power control...
US4675863 (A), filed
Mar 20, 1985
, published
Jun 23, 1987
- INT MOBILE MACHINES
A system for the wireless transmission of multiple information signals utilizing digital time division circuits between a base station and a plurality of subscriber stations. The subscriber stations may be fixed or movable. The number of time division circuits...
US5850481 (A), filed
May 08, 1995
, published
Dec 15, 1998
- DIGIMARC CORP
An identification code signal is impressed on a carrier to be identified (such as an electronic data signal or a physical medium) in a manner that permits the identification signal later to be discerned and the carrier thereby identified. The method and...
US5717510 (A), filed
Aug 02, 1995
, published
Feb 10, 1998
- FUJITSU LTD
The invention provides a technique for optimizing transmission conditions to achieve large-capacity transmission, and also provides peripheral techniques for the practical implementation of optical multiplexing that makes large-capacity transmission possible....
US7215986 (B2), filed
Jun 15, 2005
, published
May 08, 2007
- MASIMO CORP
The present invention involves a method and an apparatus for analyzing measured signals, including the determination of a measurement of correlation in the measured signals during a calculation of a physiological parameter of a monitored patient. Use of this...
US5812951 (A), filed
Nov 23, 1994
, published
Sep 22, 1998
- HUGHES ELECTRONICS CORP
The present invention relates to a wireless personal communications system (WPCS) having several features embodied in several forms. In one embodiment, the, WPCS includes at least one RP, a first SU in communication with the RP, and a second SU in communicatio...
US5103459 (A), filed
Jun 25, 1990
, published
Apr 07, 1992
- QUALCOMM INC
A system and method for communicating information signals using spread spectrum communication techniques. PN sequences are constructed that provide orthogonality between the users so that mutual interference will be reduced, allowing higher capacity and better...
US5103459 (B1), filed
Jun 25, 1990
, published
Jul 06, 1999
- QUALCOMM INC
US5121407 (A), filed
Sep 27, 1990
, published
Jun 09, 1992
- PITTWAY CORP
US4398286 (A), filed
Jul 07, 1980
, published
Aug 09, 1983
- ELECTRONIQUE MARCEL DASSAULT
In a satellite which asynchronously receives radio frequency signals from a plurality of beacons scattered at the surface of the earth, each signal received has a pure carrier wave portion followed by a phase modulated message carrying portion. The frequencies...
US5956674 (A), filed
May 02, 1996
, published
Sep 21, 1999
- DIGITAL THEATER SYSTEMS INC
A subband audio coder employs perfect/non-perfect reconstruction filters, predictive/non-predictive subband encoding, transient analysis, and psycho-acoustic/minimum mean-square-error (mmse) bit allocation over time, frequency and the multiple audio channels...
US5739327 (A), filed
Jun 07, 1995
, published
Apr 14, 1998
- CLOROX CO
Bleaching compositions are provided that comprise a nitrile containing compound that has the nitrile bonded to a quaternary nitrogen through a methylene unit (where one or both of the normal hydrogens can be substituted), and two of the quaternary nitrogen...
US6882738 (B2), filed
Oct 24, 2003
, published
Apr 19, 2005
- DIGIMARC CORP
A tangible object (such as a microprocessor, wristwatch, pharmaceutical, compact disc, vehicle part, etc) is surface-textured to encode a plural-bit code thereon. In one arrangement, this encoding conveys date information. In use, the object can be imaged by a...
US5239540 (A), filed
Nov 27, 1990
, published
Aug 24, 1993
- SCIENTIFIC ATLANTA
An apparatus and method is described for transmitting, receiving and communicating program data signals which are combined with digital data signals. Preferably, the present invention compresses 30 digital audio signals, multiplexes them with title, track,...
US6144711 (A), filed
Aug 27, 1997
, published
Nov 07, 2000
- CISCO SYSTEMS INC
A space-time signal processing system with advantageously reduced complexity. The system may take advantage of multiple transmitter antenna elements and/or multiple receiver antenna elements, or multiple polarizations of a single transmitter antenna element...
US5603081 (A), filed
Nov 01, 1993
, published
Feb 11, 1997
- ERICSSON TELEFON AB L M
A communications system in which information is transmitted in a plurality of time slots grouped into a plurality of superframes which are, in turn, grouped into a plurality of paging frames. A remote station receives paging messages once in each paging frame.
US6046992 (A), filed
Apr 24, 1998
, published
Apr 04, 2000
- INTERMEC IP CORP
An apparatus and a method for routing data in a radio data communication system having one or more host computers, one or more intermediate base stations, and one or more RF terminals organizes the intermediate base stations into an optimal spanning-tree...
US6895450 (B2), filed
Apr 16, 2002
, published
May 17, 2005
- BROADCOM CORP
An apparatus and a method for routing data in a radio data communication system having one or more host computers, one or more intermediate base stations, and one or more RF terminals organizes the intermediate base stations into an optimal spanning-tree...
US6160551 (A), filed
Mar 20, 1995
, published
Dec 12, 2000
- SUN MICROSYSTEMS INC
An intuitive graphical user interface is based upon a geographic map structure, and includes a system for controlling remote external electronic devices. In the defined graphical user interface, each space of the geographic map structure is rendered on a touch...
US5504773 (A), filed
Dec 21, 1993
, published
Apr 02, 1996
- QUALCOMM INC
In a digital communication system in which digital data is transmitted in data frames of a preselected time duration, a method and apparatus for formatting digital data in each data frame. A set of data bits of a first data type having a bit count correspondin...
US5345471 (A), filed
Apr 12, 1993
, published
Sep 06, 1994
- UNIV CALIFORNIA
An ultra-wideband (UWB) receiver utilizes a strobed input line with a sampler connected to an amplifier. In a differential configuration, +/-UWB inputs are connected to separate antennas or to two halves of a dipole antenna. The two input lines include...
US5479562 (A), filed
Jun 18, 1993
, published
Dec 26, 1995
- DOLBY LAB LICENSING CORP
The invention relates to formatting encoded audio information in a form suitable for transmission or storage. Audio information is encoded into a binary form, using an invariant number of bits to represent at least some but not all of the encoded information....
US7309990 (B2), filed
Nov 17, 2006
, published
Dec 18, 2007
- MERLIN TECHNOLOGY INC
An above ground locator includes an apparatus for determining the strength of the locating signal at a selected point relative to the boring tool. The apparatus includes an antenna arrangement configured for measuring the strength of the locating signal at the...
US7337233 (B2), filed
Dec 31, 2003
, published
Feb 26, 2008
- HUGHES NETWORK SYSTEMS
A system in which a personal computer sends messages into a TCP/IP network using a conventional dial-up link and downloads data from the TCP/IP network using a high-speed one-way satellite link. A preferred embodiment uses a conventional SLIP provider to...
US4979183 (A), filed
Mar 23, 1989
, published
Dec 18, 1990
- ECHELON SYSTEMS
A transceiver for transmitting and receiving digital data is disclosed. The transceiver employs direct sequence spread spectrum communications techniques for reducing interference among multiple users in a communications network environment. Each transceiver...
US5146471 (A), filed
Apr 11, 1991
, published
Sep 08, 1992
- ECHELON SYSTEMS
An improved correlator for use in a spread spectrum communications system which operates with a predetermined chip sequence includes an N-stage correlation register, wherein each stage corresponds to a signal chip in the sequence, an a means for autocorrelatin...
US5719852 (A), filed
May 29, 1996
, published
Feb 17, 1998
- INTERDIGITAL TECH CORP
A spread-spectrum code division multiple access interference canceler for reducing interference in a direct sequence CDMA receiver having N chip-code channels. The interference canceler includes a plurality of correlators or matched filters, a plurality of...
US5742905 (A), filed
Sep 19, 1994
, published
Apr 21, 1998
- BELL COMMUNICATIONS RES
A person communications internetworking provides a network subscriber with the ability to remotely control the receipt and delivery of wireless and wireline voice and text messages. The network operates as an interfaces between various wireless and wireline...
US6590998 (B2), filed
Aug 01, 2001
, published
Jul 08, 2003
- DIGIMARC CORP
A given data object can effectively contain both a graphical representation to a network user and embedded information, such as the URL address of another network node, thereby to permit the object itself to serve as an automated hot link. The underlying...
METHOD AND SYSTEM FOR PROVIDING A SOFT HANDOFF IN COMMUNICATIONS IN A CDMA CELLULAR TELEPHONE SYSTEM
US5101501 (A), filed
Nov 07, 1989
, published
Mar 31, 1992
- QUALCOMM INC
In a cellular telephone system a system for directing communications between a mobile user and cell-sites as a mobile user changes cell-site service areas. The mobile user includes an apparatus for, while in communication with another system user via one...
US5228056 (A), filed
Dec 14, 1990
, published
Jul 13, 1993
- INTERDIGITAL TECH CORP
A spread spectrum communications system for use over a communications channel, including a transmitter-generic-chip-code generator, a transmitter-message-chip-code generator, an EXCLUSIVE-OR gate, a combiner, a transmitter, a receiver-generic-chip-code...
US5914481 (A), filed
Oct 07, 1997
, published
Jun 22, 1999
- NORAND CORP
A pocket-sized hand-held data processing device with a coupling system, a user interface and an optical indicia reader. The device can include a display to display alphanumeric information. The display can have a touch screen input area and a handwritten input...
US7389100 (B2), filed
Mar 24, 2003
, published
Jun 17, 2008
- PARKERVISION INC
Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal are described herein. Briefly stated, such methods, systems, and apparatuses operate by receiving an EM signal and an aliasing signal having an...
US6650624 (B1), filed
May 19, 2000
, published
Nov 18, 2003
- BROADCOM CORP
A number of features for enhancing the performance of a cable transmission system in which data is transmitted between a cable modem termination system at a headend and a plurality of cable modems located different distances from the headend. The power...
US6452981 (B1), filed
Nov 05, 1999
, published
Sep 17, 2002
- CISCO SYSTEMS INC
A space-time signal processing system with advantageously reduced complexity. The system may take advantage of multiple transmitter antenna elements and/or multiple receiver antenna elements, or multiple polarizations of a single transmitter antenna element...
US6501975 (B2), filed
Jan 09, 2001
, published
Dec 31, 2002
- MASIMO CORP
A signal processor which acquires a first signal, including a first desired signal portion and a first undesired signal portion, and a second signal, including a second desired signal portion and a second undesired signal portion, wherein the first and second...
US6647130 (B2), filed
Jul 03, 2002
, published
Nov 11, 2003
- DIGIMARC CORP
A physical medium is encoded with machine readable information that provides a human interface to a computer system. The information encoded into the medium indicates a computer implemented process, and is encoded according to a spectral encoding scheme, such...
US6959100 (B2), filed
Jun 11, 2003
, published
Oct 25, 2005
- DIGIMARC CORP
A secure document design has a visible graphical structure that forms part of the aesthetic features on the document and carries encoded message information. A method for generating this design starts with a visible structure used for geometric registration....
US5109417 (A), filed
Dec 29, 1989
, published
Apr 28, 1992
- DOLBY LAB LICENSING CORP
Quantizing noise is lessened in a speech signal system by using adaptive bit allocation for subband channels, wherein subband information of digital words is represented in block-floating-point form, and normalized mantiss as may allow dropping a sign bit.
US6111673 (A), filed
Jul 17, 1998
, published
Aug 29, 2000
- TELCORDIA TECH INC
An optical signaling header technique applicable to optical networks wherein packet routing information is embedded in the same channel or wavelength as the data payload so that both the header and data payload propagate through network elements with the same...
US6745060 (B2), filed
Dec 03, 2001
, published
Jun 01, 2004
- MASIMO CORP
The present invention involves method and apparatus for analyzing two measured signals that are modeled as containing primary and secondary portions. Coefficients relate the two signals according to a model defined in accordance with the present invention. In...
US5586121 (A), filed
Apr 21, 1995
, published
Dec 17, 1996
- HYBRID NETWORKS INC
An asymmetric network communication system for use in a client-server environment having independent forward and return channels operating at different speeds and/or under different protocols on the same or different communication media to provide efficient...
