Standard time signal receiving time device and decoding method of time code signal

A technology of standard radio waves and clock devices, applied in synchronizing devices, electronic timers, electromechanical clocks, etc., can solve the problems of increased calculation amount, increased product cost, and increased power consumption.
CN1664724AInactive Publication Date: 2005-09-07OKI ELECTRIC IND CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
OKI ELECTRIC IND CO LTD
Publication Date
2005-09-07
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

In a radio controlled clock and a decoding method of a time code signal, the time code signal can be accurately decoded irrespective of the mixture of noises and the deterioration of a radio wave signal receiving situation, and arithmetic processing is simple. A standard time signal is received and the time code signal superposed on this standard time signal is sampled at an interval of 50 ms and is stored to a memory. The stored sampling data are formed as a list in a data group every one second (20 samples). The plurality of data groups formed as a list are added every each sampling point, and a point for maximizing an increase change of the adding result is set to a synchronizing point of the sampling. Further, the correlation of the sampling data group and a code template pattern is calculated and a code shown by the sampling data group is judged.
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Description

technical field

[0001] The present invention relates to a standard radio wave receiving clock device (hereinafter referred to as "radio wave clock") for clock correction by receiving a standard radio wave and a decoding method of a time code signal superimposed on the standard radio wave. Background technique

[0002] Two domestic transmitters, Kyushu Naga Station and Fukushima Naga Station, operated and managed by the independent corporation National Institute of Communications, constantly transmit time code signals representing Japan Standard Time via long waves. Hereinafter, such long waves are referred to as "standard radio waves". The standard radio waves currently used are two types of waves whose carrier frequencies are 40KHz and 60KHz, and the standard radio waves with different carrier frequencies are transmitted from the above two transmitting stations.

[0003] Amplitude modulation is performed on the carrier wave of the standard radio wave by the pulse train of ...

Claims

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