Patents by Inventor Samuel A. Leslie

Samuel A. Leslie has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6404775
    Abstract: A repeater allows terminals of a first communications system, employing a first air protocol or radio interface, to communicate with terminals of a second communications system, employing a second air protocol or radio interface different from the first. Where the first and second air protocols differ only in operating frequency, but are otherwise compatible, the repeater may linearly translate signals from the first operating frequency to the second operating frequency, and vice versa, without demodulating and remodulating the signals. Where the air protocols differ in other ways, the repeater receives and demodulates signals from the first system, converts the signals to a common format, and remodulates and retransmits the signals according to the second air protocol (and vice versa), in the same frequency bands or in different frequency bands.
    Type: Grant
    Filed: November 21, 1997
    Date of Patent: June 11, 2002
    Assignee: Allen Telecom Inc.
    Inventors: Samuel A. Leslie, Donnie L. Goins, William A. Bowen
  • Patent number: 5561845
    Abstract: A system which improves coverage in overlapping coverage areas between two type-A or type-B cellular radio telephone systems is able to direct a subscriber unit in the overlapping coverage area to the home or primary system, thereby minimizing the subscriber unit's roaming-type expenses. The system includes a control channel receiver, a control unit, and a control channel transmitter/receiver pair, in combination with a transmit/receive antenna. The system transmits a control channel, which is associated with the home system, into the overlapping region. The control channel is intended to be the strongest channel in that region. Any subscriber units in the region associated with the home system which respond to that control channel will be directed to other control channels associated with the home system. Those subscriber units will receive service from the home system, as opposed to the foreign system which may provide other strong control channels in the overlapping coverage area.
    Type: Grant
    Filed: October 2, 1992
    Date of Patent: October 1, 1996
    Assignee: Orion Industries, Inc.
    Inventors: Arne B. Bendixen, Michael W. Evans, Samuel A. Leslie, Mark M. Sihlanick
  • Patent number: 5541979
    Abstract: A cell extender for use in digital cellular telephone systems comprises a control module, and scanning module, and several traffic modules. The control module bidirectionally repeats the donor cell site control channels. Voice modules therein bidirectionally repeat selected donor traffic channels for mobiles. The voice module amplifies and translates the Reverse Digital Traffic Channel RDTC (transmitted by the mobile). The voice module reframes the Forward Digital Traffic Channel, and advances its timing such that RDTC signals transmitted by the mobile and repeated by the cell extender arrive at the donor with the correct timing alignment. The timing advance compensates for RF path propagation delay between the donor and the cell extender, and for any additional delay through the cell extender. If the voice module determines that the mobile is leaving the cell extender coverage area, it sends a hand-off message returning the mobile to the assigned donor traffic channel.
    Type: Grant
    Filed: March 8, 1994
    Date of Patent: July 30, 1996
    Assignee: Allen Telecom Group, Inc.
    Inventors: Samuel A. Leslie, Michael W. Evans, Robert T. Gordon
  • Patent number: 5448619
    Abstract: An apparatus and method which can provide a private cellular system within an area already served by a public cellular system include a receiver for receiving RF control signals from the public system. The public system control signals are converted to saturation level control signals from the private system. Subscriber units to be serviced by the public system are directed thereto. Those associated with the private system can be serviced directly.
    Type: Grant
    Filed: April 14, 1992
    Date of Patent: September 5, 1995
    Assignee: Orion Industries, Inc.
    Inventors: Michael W. Evans, Samuel A. Leslie
  • Patent number: 5218715
    Abstract: A system and method for handing back a movable transceiver to a different cell site from the original cell site includes circuitry for sensing signals from the movable transceiver which are transmitted on a modified frequency as well as circuitry for translating those signals back to their originally assigned frequencies without changing the detected field strength of the signal, in combination with circuitry for forwarding the translated signals to the different cell site for hand-off evaluation. The method includes sensing the received signals, translating the received signals to an originally assigned frequency based on either a fixed offset or other provided information concerning the translation along with a step of continually updating those frequencies which are to be retranslated.
    Type: Grant
    Filed: January 15, 1991
    Date of Patent: June 8, 1993
    Assignee: Orion Industries, Inc.
    Inventors: Samuel A. Leslie, William A. Bowen, Michael W. Evans
  • Patent number: 5168574
    Abstract: A diversity receiving apparatus includes first and second antennas and circuitry for selecting one antenna or the other. Control circuitry analyzes signal strength received from the selected antenna and determines when the antennas should be switched. The antennas are switched when the received signal strength falls below a running average thereof; the received signal strength falls below a threshold value; or a predetermined time has elapsed since the antennas have been switched. The antennas are switched when the received signal strength falls below a running average thereof; the received signal strength falls below a threshold value; or a predetermined time has elapsed since the antennas have been switched.
    Type: Grant
    Filed: November 8, 1991
    Date of Patent: December 1, 1992
    Assignee: Orion Industries, Inc.
    Inventors: Robert T. Gordon, Michael W. Evans, Samuel A. Leslie
  • Patent number: 5152002
    Abstract: A system and a method for extending coverage of a cell site in a cellular radio telephone system include a plurality of repeaters or boosters which are spaced through the region where increased coverage is desired. A first booster is in radio communication with the transceiver for the cell site. The remaining boosters are linked together, by radio transmissions, in a series configuration with only one of those linked to the first booster. A movable transceiver operating in the extended area of coverage is in radio communication with the closest booster unit and, via the serial chain of boosters in communication with the controlling cell site. As the movable unit moves along the extended area of coverage from one booster area to another, it is automatically picked up by the approaching booster and dropped by the receding booster while continuing to be in communication ultimately with the cell site via the series coupled booster chain.
    Type: Grant
    Filed: February 13, 1990
    Date of Patent: September 29, 1992
    Assignee: Orion Industries, Inc.
    Inventors: Samuel A. Leslie, Robert T. Gordon
  • Patent number: 5115514
    Abstract: A cellular communication system booster has plural narrowband and wideband channels each having down mixers, local oscillators, IF filters, and amplifiers for amplifying communication signals. On a narrowband channel preferably not in use, and preferably in a time-multiplexed manner, a reference signal of known signal strength is substituted at the output amplifier in lieu of a normal communications signal. When this amplified reference signal is broadcast at the output antenna a portion of the signal is feed back to the input antenna due to imperfect isolation between the antennas. This feedback signal is measured by a Radio Signal Strength Indicator (RSSI) circuit at the point of its receipt into the IF filter of the narrowband channel. The measured signal strength serves as a measurement of signal isolation/feedback between the antennas.
    Type: Grant
    Filed: August 12, 1988
    Date of Patent: May 19, 1992
    Assignee: Orion Industries, Inc.
    Inventor: Samuel A. Leslie
  • Patent number: 5095528
    Abstract: An apparatus for detecting excessive output power from a cellular radio telephone system booster includes input circuitry for receiving incoming radio frequency signals from a mobile source. Amplifiers are provided for amplifying the radio frequency signals either directly or by means of intermediate frequency channels. The output power amplifiers have variable gain. Circuitry detects when the transmitted radio frequency signals exceed a predetermine threshold and reduce the amplifier gain accordingly.
    Type: Grant
    Filed: April 11, 1991
    Date of Patent: March 10, 1992
    Assignee: Orion Industries, Inc.
    Inventors: Samuel A. Leslie, Michael W. Evans
  • Patent number: 5093923
    Abstract: A method for optimizing antenna orientation in a cellular radio telephone system with respect to a predetermined criterion of signal level includes the steps of orienting the antenna in a selected direction, sensing a selected received signal in a predetermined frequency range, mixing the selected received signal with the control signal so as to generate a corresponding intermediate frequency signal in an intermediate frequency transmission path, measuring a selected parameter of the intermediate frequency signal and then altering the orientation of the antenna while subsequently repeating the required steps. The preferred antenna orientation can be determined by examining the results of the various measurements and selecting an antenna orientation which maximizes the signal level of the desired received signal.
    Type: Grant
    Filed: August 12, 1988
    Date of Patent: March 3, 1992
    Assignee: Orion Industries, Inc
    Inventor: Samuel A. Leslie
  • Patent number: 5065449
    Abstract: A diversity receiving apparatus includes first and second antennas and circuitry for selecting one antenna or the other. Control circuitry analyzes signal strength received from the selected antenna and determines when the antennas should be switched.
    Type: Grant
    Filed: February 24, 1989
    Date of Patent: November 12, 1991
    Assignee: Orion Industries
    Inventors: Robert T. Gordon, Michael W. Evans, Samuel A. Leslie
  • Patent number: 5023930
    Abstract: An apparatus and method for selecting a number of cellular radio channels to be boosted in a given geographical area provides either F1-F1 or F1-F2 operation. The signals can be boosted at the same frequency with input to output isolation being achieved by the use of directive transmit and receive antennas physically positioned to achieve sufficient isolation. Each signal is individually filtered, amplified, and recombined for transmission. Any number of signals may be accommodated depending upon the number of retransmission channels available. Apparatus is also provided to retransmit a signal at a different frequency from that at which it is received. A tag, typically an audio tone or diminished signal amplitude gap, may be selectively applied to boosted retransmitted signals in order that they may be recognized as such.
    Type: Grant
    Filed: May 16, 1988
    Date of Patent: June 11, 1991
    Assignee: Orion Industries, Inc.
    Inventor: Samuel A. Leslie
  • Patent number: 4941200
    Abstract: An apparatus and method for selecting a number of cellular radio channels to be boosted in a given geographical area provides either F1-F1 or F1-F2 operation. The signals are be boosted at the same frequency with input to output isolation being achieved by the use of directive transmit and receive antennas physically positioned to achieve sufficient isolation. Each signal is individually filtered, amplified, and recombined for transmission. Any number of signals may be accommodated depending upon the number of retransmission channels available. Apparatus is also provided to retransmit a signal at a different frequency from that at which it is received.
    Type: Grant
    Filed: August 3, 1987
    Date of Patent: July 10, 1990
    Assignee: Orion Industries, Inc.
    Inventors: Samuel A. Leslie, Robert T. Gordon
  • Patent number: 4890315
    Abstract: A system for coupling a plurality of telephones or local units to a remote land line telephone system includes a line interface associated with each of the telephones or local units. Each of the line interfaces is in turn coupled to an audio switch matrix. Outputs and inputs to and from the audio switch matrix are coupled to a 4 to 2 wire hybrid, a tone interface hybrid and a computer based control unit. The control unit includes a programmed microcomputer with interface circuits enabling it to communicate with and to control the line interfaces and the audio switch matrix. The computer also includes interface circuits enabling it to communicate with and control a radio transceiver. The radio transceiver is in radio frequency communication with a corresponding radio transceiver remotely located and coupled to the remote land line telephone system. Communications with the remote land line telephone system can be initiated by any of the local units.
    Type: Grant
    Filed: December 29, 1988
    Date of Patent: December 26, 1989
    Assignee: Orion Industries, Inc.
    Inventors: Arne B. Bendixen, William A. Bowen, Michael W. Evans, John J. Hurley, Samuel A. Leslie
  • Patent number: 4513446
    Abstract: A vehicular radio transceiver is normally powered by a vehicular ignition switch and a transceiver on-off switch both being closed. A latch circuit senses the presence of communication over the transceiver, and produces a latch signal that powers the transceiver despite opening of either of the switches.
    Type: Grant
    Filed: February 9, 1983
    Date of Patent: April 23, 1985
    Assignee: General Electric Company
    Inventor: Samuel A. Leslie
  • Patent number: 4495652
    Abstract: Radiotelephone loudspeaker and handset volumes for different types or modes of operation are set by a single control and stored. After being set and stored, the volume for each mode can be retrieved and applied to an electronic attenuator to automatically provide the desired volume.
    Type: Grant
    Filed: February 28, 1983
    Date of Patent: January 22, 1985
    Assignee: General Electric Company
    Inventor: Samuel A. Leslie
  • Patent number: 4449248
    Abstract: An improved battery saving circuit for radio receivers and/or radio transceivers and/or radio communication systems of same under the control of one or more control radio transmitters and/or transceivers. The "on" and "off" time intervals for the battery saving circuits in all remote radio receivers and/or transceivers is actively and dynamically controlled in real time from a central control station so as to provide improved battery saving features.
    Type: Grant
    Filed: February 1, 1982
    Date of Patent: May 15, 1984
    Assignee: General Electric Company
    Inventors: Samuel A. Leslie, Robert C. Schwartz
  • Patent number: 4411005
    Abstract: Data signals which vary between first and second levels are applied to an operational amplifier by a timing signal produced in response to data signal transitions. The operational amplifier is connected to produce a nominal voltage in the absence of data signals, and to produce first and second voltages above and below the nominal voltage by equal amounts in response to the first and second data levels. The voltages so produced are used to control the frequency of an oscillator.
    Type: Grant
    Filed: December 21, 1981
    Date of Patent: October 18, 1983
    Assignee: General Electric Company
    Inventor: Samuel A. Leslie
  • Patent number: 4367422
    Abstract: A power on reset circuit providing a reset signal to a microprocessor-based system upon its initial power up and a reinitializing reset signal in response to low voltage power supply transients.
    Type: Grant
    Filed: October 1, 1980
    Date of Patent: January 4, 1983
    Assignee: General Electric Company
    Inventor: Samuel A. Leslie
  • Patent number: D282465
    Type: Grant
    Filed: December 16, 1983
    Date of Patent: February 4, 1986
    Assignee: General Electric Company
    Inventors: John J. Hurley, Samuel A. Leslie, Jon M. Newgard, Walter C. Pitts, Donald J. Umbdenstock