Patents Represented by Attorney Wayne J. Egan

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  • Resource allocation to non-critical users
    Patent number: 5442634
    Abstract: In a communication system having a plurality of sites (100, 101), resource allocations are monitored in the plurality of sites to identify communication resources (108) that support communications for critical members of a user group and historical information is developed regarding the communication resources. When a communication request is received from a member of a first user group, a determination is made as to whether at least one site includes only non-critical members of the first user group. A decision is made to allocate a communication resource in the non-critical-only site(s) in support of the communication request as a function of the historical information.
    Type: Grant
    Filed: March 26, 1992
    Date of Patent: August 15, 1995
    Assignee: Motorola, Inc.
    Inventor: Paul J. Cizek
  • Method for identifying corrupt encryption keys within a secure communication system
    Patent number: 5442703
    Abstract: A resource allocator (108) receives, from a first communication unit, a request to establish secure communications with at least a second communication unit. A key identifier is retrieved by the resource allocator and transmitted to at least the second communication unit. Based upon the transmitted key identifier, the second communication unit retrieves an identified encryption key and, at least when the identified encryption key is corrupt, transmits a corrupt key indication to the resource allocator. In response, the resource allocator can assign a default key identifier for use in the secure communication. In this manner, missed communications due to encryption key failures are reduced.
    Type: Grant
    Filed: May 27, 1994
    Date of Patent: August 15, 1995
    Assignee: Motorola, Inc.
    Inventors: Charles C. Kim, Robert D. Woodhouse
  • Method and apparatus for determining signal usability
    Patent number: 5440582
    Abstract: A receiver that receives a stream of information symbols may detect the usability of the stream of information symbols received as follows. Upon receiving the stream of information symbols, the receiver separates the stream of information symbols into a desired portion and an undesired portion wherein the desired portion is the originally transmitted stream of information symbols and the undesired portion is interference and noise. From the undesired portion and the desired portion, the usability can be determined based on a ratio of the two portions.
    Type: Grant
    Filed: May 28, 1993
    Date of Patent: August 8, 1995
    Assignee: Motorola, Inc.
    Inventors: Mark A. Birchler, Steven C. Jasper, Timothy J. Wilson
  • Method for monitoring communication talkgroups
    Patent number: 5434856
    Abstract: A voice packet, containing coded voice information for a communication talkgroup that is currently being monitored, is received and stored in a buffer (200-202) dedicated to the communication talkgroup. When a decoder (203-205) is available, the voice packet is decoded and the resulting decoded voice information is combined with other decoded voice information, pertaining to other monitored communication talkgroups, such that the combined decoded voice information can be rendered audible.
    Type: Grant
    Filed: November 15, 1993
    Date of Patent: July 18, 1995
    Assignee: Motorola, Inc.
    Inventor: Jian-Cheng Huang
  • Method for a communication unit to access and utilize information from an allocator
    Patent number: 5428823
    Abstract: In a communication system, a communication unit may access increased information in the following manner. The communication unit transmits an information access request to the communication resource allocator of the communication system, wherein the information access request comprises a selection of pre-established information for that communication unit. Upon receiving the information access request, the communication resource allocator retrieves pre-established information based upon the request and transmits it to the communication unit. The communication unit temporarily stores the pre-established information and executes a system service based upon the retrieved pre-established information.
    Type: Grant
    Filed: July 20, 1994
    Date of Patent: June 27, 1995
    Assignee: Motorola, Inc.
    Inventors: David J. Ness-Cohn, Lewis H. Rosenthal, David Bar-On
  • Method for providing dispatch services to communication groups and multiple communication groups
    Patent number: 5423061
    Abstract: In a communication system, an operator station provides dispatch services to communication groups and multi-communication groups. When a request is received by the operator station to provide a particular dispatch service, which requires at least one multi-communication group to be modified, a temporary multi-communication group is created based on the request and predetermined communication system limitations. After the particular dispatch service has been performed for the temporary multi-communication group, the temporary multi-communication group is discarded, returning the temporary multi-communication group to the at least one multi-communication group.
    Type: Grant
    Filed: June 1, 1993
    Date of Patent: June 6, 1995
    Assignee: Motorola, Inc.
    Inventors: Arthur L. Fumarolo, Armando Vera, Aruna Duarrani
  • Resource management by an intelligent repeater
    Patent number: 5392449
    Abstract: In a trunked communication system using intelligent repeaters (101), each intelligent repeater performs a series of tests (602, 606, 610, 614, and 618) on its own functionality. The results of these tests are transmitted (622) to a resource manager, which is one of the intelligent repeaters at a communications site. Using the results of these tests, the resource manager then selects one or more of the intelligent repeaters to perform the functions of authorization, resource allocation (708), and logging of communications (713).
    Type: Grant
    Filed: June 29, 1992
    Date of Patent: February 21, 1995
    Assignee: Motorola, Inc.
    Inventors: Mark L. Shaughnessy, Lynn Monica, Gary W. Grube
  • R.F. communication system interrogation apparatus and method
    Patent number: 5390360
    Abstract: In a radio frequency communication system, a primary unit interrogates a plurality of secondary units over a radio communication channel. The primary unit receives a command to initiate an interrogation cycle over the communication channel. The primary unit then selects a time delay from a set of time delays, and transmits an interrogation request to each secondary unit of at least a subset of the plurality of secondary units in series after the selected time delay if the channel is free at the end of the selected time delay. The primary unit then selects the longest time delay for the next interrogation cycle if a channel grant command is received, and selects a shorter time delay for the next interrogation cycle if no channel grant command is received.
    Type: Grant
    Filed: November 17, 1992
    Date of Patent: February 14, 1995
    Assignee: Motorola, Inc.
    Inventors: Shlomo Scop, Shmuel Katar
  • Method and apparatus for control of an analog to digital converter
    Patent number: 5389927
    Abstract: An analog signal having an input level is provided. The analog signal is converted into a digitized representation of the analog signal in an analog to digital converter (105) that uses an operating range. The digitized representation of the analog signal is processed (107) to determine the input level for the analog signal. The input level for the analog signal is compared (109) with a reference signal to provide a comparison signal. The comparison signal is manipulated (111) to adjust the operating range.
    Type: Grant
    Filed: May 28, 1993
    Date of Patent: February 14, 1995
    Assignee: Motorola, Inc.
    Inventors: William J. Turney, Paul H. Gailus, Mark A. Gannon
  • Data communications device with resident link adapter
    Patent number: 5388109
    Abstract: A data communications device (101, 119) may be controlled from a centrally-located network management system controller (109) located some distance from the device. The data communications device is coupled to the network management system controller by a local channel (155, 157). The device includes a link adapter (133, 143) that communicates with the controller by a protocol that allows the device to exchange messages with the controller. As many as 512 devices may be coupled to the same local channel.
    Type: Grant
    Filed: July 17, 1992
    Date of Patent: February 7, 1995
    Assignee: Universal Data Systems, Inc.
    Inventors: Dean Y. Hodge, Terry Herbster, Robert E. Ray, Jr., Fred C. Killmeyer
  • Storm plan execution attachments for trunked radio system
    Patent number: 5371900
    Abstract: A multi-user radio system, such as a trunked radio system has sets of operations ("storm plans") for execution in emergency situations. A central control and management processor is arranged to define a list of users (20) associated with a respective storm plan and to permit the defined users to execute the respective storm plan.
    Type: Grant
    Filed: March 6, 1992
    Date of Patent: December 6, 1994
    Assignee: Motorola, Inc.
    Inventors: David Bar-On, Leeba Salzman, Leonard Wurtzel
  • Synchronous flow control method
    Patent number: 5367534
    Abstract: A flow control method (200) is suitable for use with a synchronous modem (101). The modem clocks data signals (107) from the terminal under control of a clock signal (109) supplied by the modem. The clock signal operates at a clock rate. The modem stores the data signals in a buffer (111), and thereupon transmits the data signals to a channel, the channel operating at a channel rate. When the quantity of data signals stored in the buffer exceeds a maximum threshold, the modem removes the clock signal from the terminal, thereby interrupting the flow of data signals from the terminal. When the quantity of data signals stored in the buffer is less than a minimum threshold, the modem again applies the clock signal to the terminal, thereby restoring the flow of data signals from the terminal.
    Type: Grant
    Filed: June 16, 1993
    Date of Patent: November 22, 1994
    Assignee: Universal Data Systems, Inc.
    Inventors: Wei-Tai Chou, Fred C. Killmeyer
  • MODEM-channel bank converter
    Patent number: 5365545
    Abstract: A converter (200) includes a transmit circuit that converts modem transmit samples at 9,600 samples/second into samples that may be transmitted by a T1 channel bank at 8,000 samples/second. The converter also includes a receive circuit that converts T1 channel bank receive samples at 8,000 samples/second into samples that may be received by a modem at 9,600 samples/second.
    Type: Grant
    Filed: April 24, 1992
    Date of Patent: November 15, 1994
    Assignee: Universal Data Systems, Inc.
    Inventors: Steven R. Blackwell, Michael D. Fanning
  • Ballast circuit equipped with ground fault detector
    Patent number: 5363018
    Abstract: A ballast circuit (100) includes a ground fault detector (200). The ballast circuit is arranged for coupling to a power source (101) and a load (135, 137), the power source characterized by a source frequency, the ballast circuit including an electromagnetic interference ("EMI") filter (110) which includes a ground terminal (145). The ground fault detector (200) determines when the load is coupled to a ground fault (141) by detecting the presence of a high-frequency current at the ground terminal, the high-frequency current characterized by a frequency that is substantially greater than the source frequency. When the high-frequency current is detected, the ground fault detector provides an output signal (150) which may be used to disconnect the load from the ballast circuit.
    Type: Grant
    Filed: September 16, 1993
    Date of Patent: November 8, 1994
    Assignee: Motorola Lighting, Inc.
    Inventor: Peter W. Shackle
  • Demodulation selection for a communication signal
    Patent number: 5347542
    Abstract: In a system where 2-level modulation and 4-level modulation of communication signals exist, an apparatus (107) demodulates either modulation scheme by demodulating (301) a received signal under the presumption that it is a 4-level signal, and if the received signal is detected (309) to be a 2-level signal, the signal is then demodulated (319) as a 2-level signal.
    Type: Grant
    Filed: June 28, 1991
    Date of Patent: September 13, 1994
    Assignee: Motorola, Inc.
    Inventors: Christopher N. Kurby, Donald R. Beyer, Anne P. Davies-Walsh, Kevin L. Fluharty, Matthew R. Miller
  • Subscriber incompatibility display arrangement
    Patent number: 5335358
    Abstract: A method is disclosed, and an apparatus described, for providing a console display indicating the incompatibility of a subscriber with a talk group in an RF communication system. The console provides a first display as long as the system detects no subscriber incompatibility with a talk group. When the system determines the subscriber is incompatible with a talk group, however, the console provides a second display which is graphically distinct from the first display. The second display is further arranged so the incompatible subscriber can readily be identified.
    Type: Grant
    Filed: December 14, 1988
    Date of Patent: August 2, 1994
    Assignee: Motorola, Inc.
    Inventors: Timothy J. Sherburne, David J. Ness-Cohn, Randy L. Ekl
  • Handheld portable modem
    Patent number: D351841
    Type: Grant
    Filed: October 7, 1993
    Date of Patent: October 25, 1994
    Assignee: Universal Data Systems, Inc.
    Inventors: Lowell E. Blankenship, Jimmy M. Page, Gerald H. Click
  • Control tray for base station
    Patent number: D352505
    Type: Grant
    Filed: April 30, 1992
    Date of Patent: November 15, 1994
    Assignee: Motorola, Inc.
    Inventors: Marc H. Pullman, Jeffrey S. Lipschultz, Kenneth W. Larson
  • Base station panel
    Patent number: D353810
    Type: Grant
    Filed: August 24, 1993
    Date of Patent: December 27, 1994
    Assignee: Motorola, Inc.
    Inventors: Marc H. Pullman, Jeffrey S. Lipschultz
  • Telephone interconnect module face plate
    Patent number: D360419
    Type: Grant
    Filed: July 18, 1994
    Date of Patent: July 18, 1995
    Assignee: Motorola, Inc.
    Inventors: Janice M. Weber, Gary E. Peterson, Richard Ng