Radio-controlled timepiece, standard frequency reception method, and electronic device
AssigneeCitizen Watch Co., Ltd.
InventorsAkinari Takada, Takashi Ihara, Masaaki Namekawa
Life of this patent
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Abstract
The receiver receives the standard frequency signal that includes a time code. A sampling unit samples one bit of the received signal at 32 positions. A smoothing unit smoothens the result of sampling by dividing the 32 positions in two to four intervals and determines a value of the received signal in each interval. A waveform determining unit determines waveform of each bit of the received signal based on the value obtained in the smoothing unit. The decoding unit extracts the time code based on the determined waveform. A time unit correct the time based on the extracted time code.
Claims20
A radio-controlled timepiece comprising:
- a receiving unit that receives a standard frequency signal that contains a time code and, outputs a received signal based on the received standard frequency signal, the received signal having a plurality of bits;
- a sampling unit that samples each bit of the received signal at predetermined sampling periods and, outputs the result of the sampling;
- a smoothing unit that smoothens the received signal based on result of the sampling in the sampling unit;
- a waveform determining unit that determines a waveform of each bit of the received signal based on the smoothened received signal;
- and
- a time determining unit that determines the time code in the received signal based on the waveform determined by the waveform determining unit.
The standard frequency reception method comprising:
- receiving a standard frequency signal that contains a time code and, outputs a received signal based on the received standard frequency signal, the received signal having a plurality of bits;
- sampling each bit of the received signal at predetermined sampling periods and, outputting the result of the sampling;
- smoothing the received signal based on result of the sampling;
- determining a waveform of each bit of the received signal based on the smoothened received signal;
- and
- determining the time code in the received signal based on the determined waveform.
An electronic device comprising:
- a receiving unit that receives a standard frequency signal that contains a time code and, outputs a received signal based on the received standard frequency signal, the received signal having a plurality of bits;
- a sampling unit that samples each bit of the received signal at predetermined sampling periods and, outputs the result of the sampling;
- a smoothing unit that smoothens the received signal based on result of the sampling in the sampling unit;
- a waveform determining unit that determines a waveform of each bit of the received signal based on the smoothened received signal;
- and
- a time determining unit that determines the time code in the received signal based on the waveform determined by the waveform determining unit.
Dependencies are inferred from the claim text.