Radio controlled clock and method for retrieving time information from time signals
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United States of America Patent
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Feb 3, 2009
Grant Date -
Feb 17, 2005
app pub date -
Aug 2, 2004
filing date -
Jul 31, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
Time information is retrieved from time signals transmitted by a transmitter and received by a receiver. The retrieval relies on the examination of at least one time portion (86, 87, 88) within a time frame. The time portion has a duration shorter than the duration of the time frame (80-82), to reduce processing operations. The examination checks whether an amplitude of the time signal changed within a time portion. The amplitude change either up or down is then evaluated for the retrieval of the time information. A receiver for receiving the time signals includes components for preprocessing the received time signals thereby reducing the processing steps of a microprocessor connected to the output of the receiver.
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