Patents by Inventor J. M. A. Frederic Simard

J. M. A. Frederic Simard 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).

  • Digital FSK demodulator with automatic offset cancellation
    Patent number: 5436590
    Abstract: A digital FSK demodulator used in e.g. a telephone loop produces unequal amplitudes in detected mark and space tones. The inequality or offset must be cancelled so that a proper timing signal can be recovered from the FSK signal. The demodulator includes a digital compensation circuit for offset cancellation in which peak amplitudes of digital 0 and digital 1 signals are continuously monitored. The peak amplitudes are then averaged to obtain an offset estimation which is subtracted from the output of the demodulator for offset compensation.
    Type: Grant
    Filed: August 25, 1994
    Date of Patent: July 25, 1995
    Assignee: Northern Telecom Limited
    Inventors: J. M. A. Frederic Simard, William T. Ross