Accession Number : ADD014318

Title :   Active Phase and Amplitude Modulator.

Descriptive Note : Patent, Filed 17 Oct 88, patented 29 Aug 89,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Olver, Terence E

Report Date : 29 Aug 1989

Pagination or Media Count : 6

Abstract : An active phase and amplitude modulator separates an input carrier into four phases. The phases are amplified and modulated separately. Summing circuits combine the phases into a single resultant output. Modulators are an essential part of adaptive signal cancellers. The function of a modulator is to provide a signal exactly in amplitude but 180 degrees out of phase with an unwanted signal existing in the canceller circuit. The result is that the unwanted signal is nulled out and cancelled. Unwanted signals may be, for example, signals from a nearby transmitter coupled into the input circuits of a receiver, or distortion causing signals in transmitter circuits. PAT-CL-332-23.R. (JES)

Descriptors :   *ADAPTIVE SYSTEMS, *AMPLITUDE MODULATION, *MODULATORS, *PATENTS, CANCELLATION, CIRCUITS, DISTORTION, INPUT, SIGNALS, TRANSMITTERS

Subject Categories : Electromagnetic Pulses
      Electrical and Electronic Equipment
      Cybernetics

Distribution Statement : APPROVED FOR PUBLIC RELEASE