Browse Prior Art Database

Automatic Unity Gain Analyzer

IP.com Disclosure Number: IPCOM000094372D
Original Publication Date: 1966-Oct-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Crauwels, GL: AUTHOR [+2]

Abstract

This communication system employs monitor channels to provide passive adaptive protection against phase delay variations and fading in the transmission channel. At the transmitting station shown in drawing 1, pulse amplitude samples are presented on input lines S1...Sn. At the appropriate instances, these samples are passed through gates G1...Gn to storage capacitors CI...Cn for modulating the in-phase and quadrature components of a plurality of frequency carriers f1, f2... in double sideband suppressed carrier modulators M1... Mn. The in-phase and quadrature components are combined in variable gain amplifiers V1...Vn. These are controlled by a series of overlapping Gaussian waveforms from waveform generator 2. A plurality of monitor signals Sp...Ss of a predetermined amplitude and phase are provided.

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Automatic Unity Gain Analyzer

This communication system employs monitor channels to provide passive adaptive protection against phase delay variations and fading in the transmission channel. At the transmitting station shown in drawing 1, pulse amplitude samples are presented on input lines S1...Sn. At the appropriate instances, these samples are passed through gates G1...Gn to storage capacitors CI...Cn for modulating the in-phase and quadrature components of a plurality of frequency carriers f1, f2... in double sideband suppressed carrier modulators M1... Mn. The in-phase and quadrature components are combined in variable gain amplifiers V1...Vn. These are controlled by a series of overlapping Gaussian waveforms from waveform generator 2. A plurality of monitor signals Sp...Ss of a predetermined amplitude and phase are provided. These signals occupy frequency channels which are interspersed between the data channels and thus provide a measure of protection against cross talk between the data channels.

At the receiving station shown in drawing 2, filters F1...Fn and Fp...Fs separate the various data and monitor channels. Demodulators D1...Dn demodulate the outputs of filters F1...Fn under the control of frequency generators F1...Fi. The outputs from demodulators D1...Dn are passed through gated variable gain amplifiers A1...An under the control of timing device 3 which overlaps the gating signals in the same manner as the overlapping of the Gaussian waveforms by...