Accession Number : ADD001517

Title :   Phase Derivative Modulation Method and Apparatus.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Phillips,Chester C

Report Date : 18 Jun 1974

Pagination or Media Count : 6

Abstract : One object of the patent is to provide an improved modulation method and apparatus for modulating a carrier frequency signal with phase code data. Another object is to provide a phase derivative modulation method and apparatus in accordance with which phase code switching transients occur when the amplitude of the signal to be modulated therewith is zero, thus removing discontinuities from the output time waveform. Another object is to provide an improved modulation method and apparatus for modulating a carrier frequency signal with phase code information wherein the spectral width of the output modulated signal is substantially reduced, with relatively low sidebands.

Descriptors :   *Phase modulation, *Patents, Coding, Carrier waves, Circuits

Subject Categories : Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE