Clock-frequency recovery device adapted to high-frequency radioc

Pulse or digital communications – Spread spectrum – Direct sequence

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Details

333 17R, 375119, 375120, 455260, 455265, H04L 700, H03D 324

Patent

active

045611017

ABSTRACT:
A clock-frequency recovery device applicable to digital transmission systems for radiocommunications by tropospheric or ionospheric propagation as well as from moving vehicles includes a rectification circuit, a filter circuit, a switching circuit and an output circuit comprising a delay line controlled by a phase-locked oscillator. The input of the output circuit is connected to the output of the filter circuit when the noise level of the transmission is below a predetermined threshold value. The input of the output circuit is connected to its own output when the noise level of the transmission is higher than said threshold value.

REFERENCES:
patent: 2797326 (1957-06-01), Putzrath
patent: 3057959 (1962-10-01), Rowe
patent: 3462551 (1969-08-01), Fong
patent: 4215239 (1980-07-01), Gordy et al.
patent: 4326173 (1982-04-01), Newman

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