Patents by Inventor Michel J. Maitre

Michel J. Maitre 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: 4059805
    Abstract: Demodulator for phase modulated carrier pulse signals or phase codes in which the pulses are coded according to a plurality of N phases of the carrier. It comprises a digital phase lock loop system for locking to a frequency equal to N times the carrier frequency which includes at least a two input phase detector, a loop integrator and a voltage controlled oscillator having an output connected to the first input of the phase detector, means for dividing by N the frequency of this oscillator and for generating a reference carrier signal. The phase codes are decoded by comparing the phases of the carrier of the phase codes to the phase of the reference signal. In order to derive from all the phase codes a train of synchronous pulses a multiphase shifter receives the carrier of the phase codes and locally generates a plurality of carriers having phase shifts equal to 0, 2.pi./N, 2.times.2.pi./N, . . . ([N/2]- 1) .times.2.pi.
    Type: Grant
    Filed: February 1, 1977
    Date of Patent: November 22, 1977
    Assignee: Lignes Telegraphiques et Telephoniques
    Inventors: Patrick M. de Laage de Meux, Michel J. Maitre