发明名称 |
AUTOMATIC TIME ADJUSTMENT DEVICE |
摘要 |
PROBLEM TO BE SOLVED: To minimize a time delay in time adjustment and to enable precise time adjustment by transmitting a time adjustment pulse to a signal extract clock part of a frequency of a time signal sound. SOLUTION: A band-pass filter/level conversion part 12 includes a filter for letting a signal of an announcement sound frequency and a signal of a time signal sound frequency pass and a level conversion part for converting an AC signal of an output of this filter to a rectangular wave signal. Also an announcement sound identification part 13 adds an enable signal to a time adjustment pulse generation part 14 when it identifies the announcement sound and it continues for a fixed times. Then, the time adjustment pulse generation part 14 outputs a time adjustment pulse by a rise timing of the rectangular wave signal for indicating the time signal sound from the band-pass filter/level conversion part 12 and inputs it to a clock part 2 by way of an interface part 15 when this enable signal is being inputted. The clock part 2 adjusts the time in accordance with this time adjustment pulse. |
申请公布号 |
JPH1127410(A) |
申请公布日期 |
1999.01.29 |
申请号 |
JP19970181192 |
申请日期 |
1997.07.07 |
申请人 |
FUJITSU LTD |
发明人 |
MIYAZAKI KIYOTAKA;ADACHI HIROSHI;EGUCHI NOBUHIKO |
分类号 |
G04C9/04;G04G5/00;H04M3/42;H04M11/00 |
主分类号 |
G04C9/04 |
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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