Browse Prior Art Database

Phase Demodulator

IP.com Disclosure Number: IPCOM000094660D
Original Publication Date: 1965-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 71K

Publishing Venue

IBM

Related People

Desblache, A: AUTHOR

Abstract

The circuitry demodulates phase-modulated waves with four possible phases. The method adds the modulated wave and the inverted modulated wave to a reconstructed carrier wave substantially equal in amplitude, and to the same carrier shifted by a fourth of a period, and selects the amplitude levels, drawing 1.

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Phase Demodulator

The circuitry demodulates phase-modulated waves with four possible phases. The method adds the modulated wave and the inverted modulated wave to a reconstructed carrier wave substantially equal in amplitude, and to the same carrier shifted by a fourth of a period, and selects the amplitude levels, drawing 1.

A reconstructed carrier is obtained through synchronizing a circuit tuned on a frequency equal to the quadruple of the carrier frequency by the received signal, and through dividing by four the frequency of the obtained wave, drawing 2.

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