Ghost cancellation device

Details Ghost cancellation device Ghost cancellation device

1976-11-02

1978-07-11

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358905, H04B 118, H04B 704

Patent

active

041004965

ABSTRACT:
Disclosed is a device for eliminating the ghost wherein at least two antenna bays are spaced apart in the horizontal direction by 1/4 wavelength, a mixer is provided which mixes the outputs from the antenna bays, phase shifting means for shifting the ghost signal in phase with or out of phase by 180.degree. with the desired signal is inserted between the output terminal of one antenna bay and an input terminal of the mixer, amplitude control means is inserted between the output terminal of the other antenna bay and an input terminal of the mixer, and the output from the mixer is delayed and the delayed output and the undelayed output from the mixer are mixed so as to control their amplitudes and polarities, whereby the ghost signal may be cancelled.

REFERENCES:
patent: 2786133 (1957-03-01), Dyke
patent: 2981834 (1961-04-01), Holloway et al.
patent: 3478269 (1969-11-01), Enemark et al.

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