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| Number | Title | Issue Date |
| 7100203 | Operating session reauthorization in a user-operated device An authorization-update process for use in a user-operated device re-authorizes an operating session after a rapid idle timeout using the authorization-update process, which has fewer steps than a normal authorization process. The re-authorization process can requir... | 08/29/2006 |
| 7065182 | Voice mail message repositioning device A voice message repositioning process is provided for a voice message system that stores voice messages for a user of the system and provides feedback to the user of the progress of repositioning the playback of a voice message. A voice message is repositioned upon ... | 06/20/2006 |
| 6466801 | Two-way communication device with transmission of stored signal directly initiated by user A circuit for use in a two-way pager of a paging system to transmit voice messages. The circuit includes: a microphone to receive an analog audio signal provided by a user; an analog-to-digital (A-D) converter coupled to the microphone; a memory; a proces... | 10/15/2002 |
| 6421708 | World wide web access for voice mail and page An integrated message processing system is provided. The message processing system allows for the management of a plurality of messages all within an integrated graphical environment. Allowable messages types include voice messages, pages, facsimile messa... | 07/16/2002 |
| 6392990 | Method for implementing interface redundancy in a computer network A method and system for recovering transparently from a network interface failure. The method is to be run in a computing device on a network with multiple peer computing devices, having redundant network interfaces connected with redundant cables. The me... | 05/21/2002 |
| 6304842 | Location and coding of unvoiced plosives in linear predictive coding of speech A method of encoding signal segments which represent unvoiced plosives. The signal segments to be encoded are contained within a speech signal divided into m=1, . . . , N frames. Each frame is subdivided into l=1, . . . , L subframes. The speech signal ha... | 10/16/2001 |
| 6282428 | Two-way paging system having random reverse channel slot scheduling In a two-way paging system including a paging terminal, a plurality of paging transmitters, a plurality of paging receivers, and a plurality of two-way paging units, the plurality of two-way paging units transmitting reverse channel messages to the paging... | 08/28/2001 |
| 6269080 | Method of multicast file distribution and synchronization The present invention involves a method for multicast file distribution and synchronization in data networks. Specifically, the present invention includes a mechanism for efficient and reliable distribution of a data file from a single source to a large n... | 07/31/2001 |
| 6269131 | Physical channel estimator A physical channel estimator for a communication system using pilot symbols and an equalizer uses a model of the system in which the impulse response of the physical channel is considered separately from the impulse responses of the pulse shaping filters ... | 07/31/2001 |
| 6260168 | Paging system having optional forward error correcting code transmission at the data link layer A method and system for performing optional or selective forward error correction (FEC) on data within the data link layer before the data is transmitted. First, a determination is made as to what data in the data link layer requires to be FEC encoded. Ne... | 07/10/2001 |
| 6253062 | Voice information service networking system A system for distributing voice information service messages (VISMs) to subscribers through their voice pagers is provided with a voice information service workstation where VISMs are recorded, and a voice information service terminal which converts the V... | 06/26/2001 |
| 6240088 | Method for two-stage data transmission A method is disclosed for sequential transmission of at least two sub-packages of the data package from an electronic communication transmitter to an electronic communication receiver. A first sub-package of the data package in a form comprehensible to th... | 05/29/2001 |
| 6232969 | Device for composing or editing a string of characters A device for composing or editing a string of characters representing information, such as a text message, comprises a character string display for displaying a character string being composed or edited and a character selection display for displaying a s... | 05/15/2001 |
| 6195533 | Method for storing an application's transaction data in a wireless messaging system A method for storing transaction data for an application in a wireless messaging system is disclosed. Applications can be used to allow paging messages to be entered into a wireless messaging system from external systems such as E-mail or the World Wide W... | 02/27/2001 |
| 6173011 | Forward-backward channel interpolator An interpolator having a linear phase response has a first stage implemented with an IIR filter to achieve the narrow transition bandwidth with relatively few filter coefficients. Zero-stuffing and filtering are used to achieve the interpolation. A forwar... | 01/09/2001 |
| 6173157 | Method of registering and controlling registration data for new and roaming pagers in a paging system A method for registering and controlling registration data for new and roaming pagers in a paging system. Messages for the pagers pass through an input messaging switch to the pager's home messaging switch, from which the messages are sent to an output me... | 01/09/2001 |
| 6169971 | Method to suppress noise in digital voice processing A method of suppressing noise in an input signal having voice components and noise components is provided. The method is an automatic gain control (20) implemented preferably in software. The noise components and the voice components are identified by a n... | 01/02/2001 |
| 6141390 | Predistortion in a linear transmitter using orthogonal kernels A system for linearly transmitting an amplified output signal using predistortion is disclosed. The system uses a straight inverse modeling scheme with orthogonal predictor variables to more easily and accurately determine the inverse of the distortion ca... | 10/31/2000 |
| 6112055 | Method and apparatus for conserving power in a pager A paging protocol includes header synchronization and system information segments containing information that allows a pager to conserve power. These segments can indicate a schedule of transmissions, and the channels of other transmissions. The pager can... | 08/29/2000 |
| 6097933 | Method and apparatus for conserving power in a pager A paging protocol includes header synchronization and system information segments containing information that allows a pager to conserve power. These segments can indicate a schedule of transmissions, and the channels of other transmissions. The pager can... | 08/01/2000 |
| 6088336 | Computer network and methods for multicast communication A method of preparing a group distribution graph for multicast transmission of a packet to a group of nodes in a computer network is disclosed. The method includes first preparing a spanning tree that includes every node in the computer network. A group d... | 07/11/2000 |
| 6088407 | Digital diversity receiver system A two-way paging system includes one or more transmitters, a plurality of receivers, and at least one two-way personal paging unit or pager. The two-way pager receives pages from the transmitter, and sends response signals which are detected by the receiv... | 07/11/2000 |
| 6087983 | System for broadcasting GPS data to a pager A communications network for GPS systems is configured so that the service area (i.e., the geographical area to which GPS service is provided) is divided into relatively small sections. Each section has a unique code assigned to it. The satellites of the ... | 07/11/2000 |
| 6049577 | Header synchronization detector A pattern detector adapted for wireless communication systems includes an error calculator, a comb filter, an averager, and a threshold detector. The pattern to be detected is a sequence of pilot signal patterns whose error calculation is relatively invar... | 04/11/2000 |
| 6032258 | Apparatus and methods for transmission security in a computer network A method for validating a message packet communicated from a source node to a destination node in a computer network is disclosed. The source node and destination node have access to a clock mechanism synchronized with a common time frame. The method comp... | 02/29/2000 |
| 5995850 | Method and apparatus for on-the-fly mode change in a paging transmitter A method and apparatus for on-the-fly mode change in a paging system (201) is provided. A transmitter controller (301) in a base station (207) receives paging information. From the paging information, the transmitter controller (301) is capable of identif... | 11/30/1999 |
| 5959500 | Model-based adaptive feedforward amplifier linearizer A linear RF transmitter uses an adaptive forward model of the power amplifier in a feedforward linearization system. The forward model outputs a modeled power amplifier output signal, which is then used to calculate the error signal. The error signal repr... | 09/28/1999 |
| 5930296 | Low-complexity bidirectional equalizer Disclosed are bidirectional equalizer arrangements in which the outputs of the forward and reverse equalizers are combined using low complexity processing to yield a single output sequence. In each disclosed arrangement of the invention, the low complexit... | 07/27/1999 |
| 5923712 | Method and apparatus for linear transmission by direct inverse modeling A system for linearly transmitting an amplified output signal using predistortion whereby a straight inverse modeling scheme is used to more easily and accurately determine the inverse of the distortion caused by a power amplifier of a RF transmitter. The... | 07/13/1999 |
| 5920808 | Method and apparatus for reducing key-up distortion by pre-heating transistors A biasing circuit for a power amplifier, for use in a transmitter, that substantially reduces distortion during key-up and thereby reduces key-up time. The power amplifier includes an output transistor and a bias circuit. The bias circuit is applied to al... | 07/06/1999 |
| 5914959 | Digital communications system having an automatically selectable transmission rate A system and method for maintaining communication between a paging base station (transceiver) and a mobile paging unit when signal reception is below a level that would otherwise be unacceptable. The system changes from one data transmission rate to anoth... | 06/22/1999 |
| 5913921 | System for communicating information about nodes configuration by generating advertisements having era values for identifying time reference for which the configuration is operative An improved computer network and methods for determining current configurations of abstract nodes is accomplished by using era values in the configurations of the abstract nodes. Abstract nodes which represent network components within the network have ac... | 06/22/1999 |
| 5909129 | Low cost microstrip phase detector A low-cost microstrip phase detector that is photo-etched onto a circuit board is disclosed. The phase detector is used to detect the phase difference between two high-power radio frequency (RF) signals. One RF signal enters a delay line causing the signa... | 06/01/1999 |
| 5905416 | Die-cast duplexer A duplexer, usable to interlink a receiver unit, transmitter unit, and an antenna unit of a communication system, has a body that includes cavities and interconnecting apertures. The duplexer further includes resonator covers that cover the cavities and a... | 05/18/1999 |
| 5881375 | Paging transmitter having broadband exciter using an intermediate frequency above the transmit frequency The present invention teaches a paging transmitter that has an exciter that upconverts a modulated signal to an intermediate frequency (IF) above that of the transmit frequency. By so doing, the paging transmitter can broadcast a large range of transmit f... | 03/09/1999 |
| 5867065 | Frequency selective predistortion in a linear transmitter A system for linearly transmitting an amplified output signal using predistortion is disclosed. The system uses a straight inverse modeling scheme to more easily and accurately determine the inverse of the distortion caused by a power amplifier of a RF tr... | 02/02/1999 |
| 5815532 | Method and apparatus for peak-to-average ratio control in an amplitude modulation paging transmitter A method and apparatus for reducing peak-to-average power ratio in a paging transmitter broadcasting an independent sideband amplitude modulation protocol is disclosed. A digital signal, for example a digital voice signal, is provided to a control gain ge... | 09/29/1998 |
| 5809090 | Digital diversity receiver system A two-way paging system includes one or more transmitters, a plurality of receivers, and at least one two-way personal paging unit or pager. The two-way pager receives pages from the transmitter, and sends response signals which are detected by the receiv... | 09/15/1998 |
| 5805077 | Two-way paging system having reverse channel message frequency authentication A method of modifying reverse channel messages in a two-way paging system (101) to authenticate reverse channel messages is disclosed. The intended frequency of the reverse channel message is converted into a unique binary integer. The binary integer is u... | 09/08/1998 |
| 5787133 | Signal modulation employing a pseudo-random sequence of pilot symbols A modulator that modulates and encodes data using data symbols, interspersed with pilot symbols, for transmission to another modem, and a demodulator that decodes data symbols of a signal received from another modem. In the demodulator, a received signal ... | 07/28/1998 |
