发明名称 |
Reception circuit, radio-controlled timepiece, and reception circuit control method |
摘要 |
A reception circuit can receive a plurality of standard time signals and has a reception means for selectively receiving and demodulating any one of the plural standard time signals, and a control means for outputting a control signal that controls the reception means. The reception means includes a signal amplifier unit for amplifying a reception signal representing the received standard time signal; a signal extraction unit for extracting a signal of a specific frequency from the amplified reception signal; a rectifier unit for rectifying the extracted signal of the specific frequency; and a demodulation unit for demodulating the rectified signal of the specific frequency. The signal extraction unit includes a plurality of crystal filters corresponding to the frequencies of the plural standard time signals; a plurality of parallel capacitances corresponding to the plural crystal filters and parallel connected to the plural crystal filters; a filter switching unit for switching the plural crystal filters based on the control signal; and a parallel capacitance switching unit for switching the plural parallel capacitances based on the control signal. The control means outputs to the filter switching unit and the parallel capacitance switching unit a control signal denoting the switch states enabling the reception means to receive the standard time signal.
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申请公布号 |
US7720452(B2) |
申请公布日期 |
2010.05.18 |
申请号 |
US20070763332 |
申请日期 |
2007.06.14 |
申请人 |
SEIKO EPSON CORPORATION |
发明人 |
MIYAHARA FUMIAKI;FUJISAWA TERUHIKO |
分类号 |
H04B1/18;G04C11/02 |
主分类号 |
H04B1/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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