Method for gaining time information and receiver for...

Details Method for gaining time information and receiver for... Method for gaining time information and receiver for...

2005-01-28

2008-05-06

Ahn, Sam K. (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

Reexamination Certificate

active

07369628

ABSTRACT:
Time signals transmitted by a time signal transmitter and received by a receiver are processed for gaining time information and for reducing demodulation errors to increase the demodulation certainty. For this purpose the following steps are performed in a time signal receiver: a) scanning of received time signals, b) storing of scanned values of the time signal, c) detecting from the scanned and stored values an amplitude change in said time signal, d) measuring the duration of any detected amplitude changes, e) evaluating the measured time durations relative to a predetermined time duration (Δt) and f) excluding from further processing amplitude changes that have a measured duration that is shorter than the predetermined duration. Amplitude changes of longer duration than (Δt) are demodulated and further processed. The receiver circuit is equipped to perform the foregoing steps, particularly in a radio-controlled clock.

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Peter Hetzel, “Time Information and Normal Frequency” (Zeitinformation und Normalfrequenz), Telekom Praxis, vol. 1, 1993, pp. 25 to 36.

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