Patents by Inventor Donald L. Linder

Donald L. Linder 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: 5940400
    Abstract: A method (600), device, wireless transceiver, computer and personal digital assistant (300, 400) provide collision presence detection in wireless intensity-modulated binary-coded data transceivers which is compatible with the collision detection employed in IEEE standard 10BASE-T Ethernet. A measurement of the degree of correlation which exists between the signal transmitted and the signal received provides a basis for efficient collision detection in CSMA systems.
    Type: Grant
    Filed: November 6, 1996
    Date of Patent: August 17, 1999
    Assignee: Motorola, Inc.
    Inventors: Bruce C. Eastmond, Rachid M. Alameh, S. David Silk, Donald L. Linder
  • Patent number: 4977616
    Abstract: An antenna switch control circuit for use in achieving antenna selection diversity in TDM RF receivers. RSSI for at least one antenna is monitored during time slots containing information not of interest. This information can then be compared with other antenna performance information to allow a selection to be made such that the receiver generally operates with the antenna receiving the strongest signal. In one embodiment, all possible antennas are monitored during a time slot containing information not of interest. In another embodiment, RSSI for the selected antenna can be monitored during the time slot of interest, such that antenna selection can again be varied should the selected antenna diminish in performance.
    Type: Grant
    Filed: October 26, 1989
    Date of Patent: December 11, 1990
    Assignee: Motorola, Inc.
    Inventors: Donald L. Linder, Steve H. Goode, Henry L. Kazecki, Donald W. Dennis, James C. Baker
  • Patent number: 4893347
    Abstract: An improved FM companding communication system is disclosed in which noise bursts and pops in the audio output of the receiver, due to weak and Rayleigh-faded signals, are minimized by selectively attenuating the audio signal in the receiver prior to expansion. The amount and rate of attenuation for the noise reduction circuits is determined by a control signal derived from either the average discriminator noise at frequencies above 3 kHz, or from a received RF signal strength indicator, or a combination of both. The audio output is attenuated during weak signals or Rayleigh fades only when the attenuation control signal increases above a predetermined signal-to-noise ratio threshold. Preferably, attenuation increases at a rate greater than the decrease in the received signal strength. The invention includes a circuit for modifying the expansion characteristics of the expandor to minimize signal clipping in the output audio stage of the receiver due to limited dynamic range.
    Type: Grant
    Filed: August 28, 1987
    Date of Patent: January 9, 1990
    Assignee: Motorola, Inc.
    Inventors: Bruce C. Eastmond, Donald L. Linder
  • Patent number: 4754450
    Abstract: A time division multiplexed (TDM) communication system is disclosed, which apportions radio frequency communication channels into at least two time slots. Voice signals for transmission on this system are analyzed and vo-coded into a digital signal that is transmitted during one or more of the time slots. Received messages are recovered from at least one of these time slots and the voice message synthesized from the vo-coded signal. In this manner multiple voice messages may be transceived in a time division multiplexed manner on a single narrowband communication channel.
    Type: Grant
    Filed: March 25, 1986
    Date of Patent: June 28, 1988
    Assignee: Motorola, Inc.
    Inventors: Charles N. Lynk, Jr., Eric R. Schorman, Donald L. Linder
  • Patent number: 4618941
    Abstract: An embodiment of the invention includes a binary linear phase response filter having a plurality of weighted outputs and a summing circuit which sums groups of the weighted outputs. A polarity inverting mechanism is provided for selectively changing the polarity of the summed outputs from the summing circuit means. An encoding circuit controls the polarity selection in accordance with the logic rule for converting non-return to zero (NRZ) data into return to zero data. Another summing circuit sums the outputs of the polarity inverting mechanism and provides a filtered multilevel data output.
    Type: Grant
    Filed: September 19, 1983
    Date of Patent: October 21, 1986
    Assignee: Motorola, Inc.
    Inventors: Donald L. Linder, Scott N. Carney
  • Patent number: 4601061
    Abstract: An AFC circuit may include an oscillator having an output frequency responsive to a derived error signal, a mixer for mixing a received signal with the output of the oscillator to produce an intermediate frequency, and a signal recovery detector for recovering the information carried by the intermediate frequency. An integral loop filter and compensation circuit receives the recovered signal from the detector, provides a compensated recovery signal which is independent of the closed loop frequency response of the AFC circuit, and provides an error signal which controls the oscillator.
    Type: Grant
    Filed: July 2, 1984
    Date of Patent: July 15, 1986
    Assignee: Motorola Inc.
    Inventors: Scott N. Carney, Donald L. Linder
  • Patent number: 4581749
    Abstract: An automatic deviation control circuit for an angle modulated data transmitter is disclosed wherein the deviation level of modulated data is controlled by a modulation cancelling deviation error detection feedback loop. After the modulation is cancelled from a sample of modulated carrier by a predetermined value of deviation, residual modulation is detected, sampled following a predetermined number of like-level data bits, and applied to the modulation path gain to increase or decrease the deviation such that the residual modulation is minimized.
    Type: Grant
    Filed: July 2, 1984
    Date of Patent: April 8, 1986
    Assignee: Motorola, Inc.
    Inventors: Scott N. Carney, Steven H. Goode, Donald L. Linder
  • Patent number: 4562414
    Abstract: There is disclosed a new and improved frequency modulation system and method for providing a frequency modulated signal which varies in frequency from a center frequency in response to the amplitude of an analog modulating signal. The system and method utilizes a frequency shift synthesizer to provide the frequency modulated signal and digital techniques for quantizing the amplitude modulating signal and providing dividing factors to the frequency shift synthesizer responsive to the amplitude quantization.
    Type: Grant
    Filed: December 27, 1983
    Date of Patent: December 31, 1985
    Assignee: Motorola, Inc.
    Inventors: Donald L. Linder, William R. Murphy
  • Patent number: 3962553
    Abstract: A battery saving system for a portable duplex communications system such as a portable telephone system includes a voice operated transmitter within each portable unit which automatically transmits radio signals upon application of audio signals thereto and discontinues transmission upon termination of the audio signals to conserve battery power. A companion receiver includes a fast acting squelch system to substantially eliminate the noise bursts occurring between transmissions by said portable unit.
    Type: Grant
    Filed: October 29, 1974
    Date of Patent: June 8, 1976
    Assignee: Motorola, Inc.
    Inventors: Donald L. Linder, Orville M. Eness, Charles N. Lynk, Jr.