Apparatus for detecting and discriminating phase jumps in a peri

Telephonic communications – Subscriber line or transmission line interface – Network interface device

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370 321, H04J 1500

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active

048295663

ABSTRACT:
The apparatus for detecting and discriminating phase jumps in a periodic signal comprises, arranged in cascade between an input terminal (1) and an output terminal (2), a frequency converter (3) transforming the frequency spectrum of the input signal e(t) containing a line at the frequency f.sub.e in a continuous band spectrum whose frequency is centered around f.sub.e, an interrupter (4), a resonator (5) having a resonant frequency f.sub.0 near f.sub.e and a phasemeter (6) having detection and discrimination means. The ensemble of these elements (3-6) is controlled by a sequencer (7) which, at each period .alpha. such that .alpha.=t.sub.1 +t.sub.2, allows the phase detection and the discrimination of each phase jump of a predetermined value .DELTA..phi..sub.e which may be contained in the input signal at the frequency f.sub.e.

REFERENCES:
patent: 4558187 (1985-12-01), Billi et al.

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