Patents by Inventor Whitney Robertson Campbell

Whitney Robertson Campbell 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).

  • Control center for a communications system with interchannel patching capabilities
    Patent number: 4029901
    Abstract: A radio communication system of base stations, and a telephone system, are linked and controlled by a control center.
    Type: Grant
    Filed: November 13, 1975
    Date of Patent: June 14, 1977
    Assignee: Motorola, Inc.
    Inventor: Whitney Robertson Campbell
  • Audio line driver amplifier
    Patent number: 4027269
    Abstract: A pair of complementary output transistors having common connected emitters and a primary winding of a transformer in each of the collector circuits, said transistors being biased in class AB operation with a drive transistor connected to the base thereof and a feedback circuit, including both AC and DC, connected from the common emitters to the input of the drive transistor so that the quiescent current of the amplifier is very low and the output impedance is high.
    Type: Grant
    Filed: June 30, 1975
    Date of Patent: May 31, 1977
    Assignee: Motorola, Inc.
    Inventor: Whitney Robertson Campbell
  • Audio compressor/limiter amplifier
    Patent number: 3986049
    Abstract: An audio compressor amplifier including an operational amplifier with compressor means connected from the output to the input for compressing signals at the output to a predetermined constant level in a predetermined attack time and including a plurality of diodes connected to reduce the series resistance in the compressor means for decreasing the attack time when the output signal exceeds the predetermined constant level by a predetermined amount, and a gain control feedback resistor connected from the output to the input of the operational amplifier and including a second resistor and a plurality of diodes connected in parallel therewith to reduce the gain of the operational amplifier and provide peak limiting action when a signal at the output exceeds a predetermined value in excess of the predetermined constant level.
    Type: Grant
    Filed: June 30, 1975
    Date of Patent: October 12, 1976
    Assignee: Motorola, Inc.
    Inventors: Whitney Robertson Campbell, Raymond Maurice Fardoux