Including Stabilization Or Alternatively Distortion, Noise Or Other Interference Prevention, Reduction Or Compensation Patents (Class 332/107)
  • (U) modulator to provide a continuous stepped frequency signal format
    Patent number: 5005018
    Abstract: A modulator provides a continuous signal format composed of discrete freqcy steps and is designed to eliminate frequency overlap or smearing normally associated with filter ringing.
    Type: Grant
    Filed: October 6, 1982
    Date of Patent: April 2, 1991
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Glenn A. Walters
  • Multi-phase PSK modulation apparatus
    Patent number: 4930141
    Abstract: A multi-phase PSK modulation apparatus includes a multi-phase PSK modulator and baseband signal modification circuitry which modifies the baseband signal in accordance with modulation frequencies to correct all or a portion of any offset error, amplitude error and orthogonality errors. The baseband signal modification circuitry permits error correction over a wide range of frequencies using a rather simple arrangement. In addition, spurious outputs, volume and cost of the apparatus are reduced.
    Type: Grant
    Filed: July 29, 1988
    Date of Patent: May 29, 1990
    Assignee: NEC Corporation
    Inventor: Shinichi Ohmagari