| 发明名称 |
Automatic determination of time base in electronic time-keeping apparatus |
| 摘要 |
An AC line signal of unknown frequency is compared to a signal of known reference to determine the frequency of the AC line signal. Thereafter, the AC line frequency signal is used as a time-base for keeping real time.
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| 申请公布号 |
US4763193(A) |
申请公布日期 |
1988.08.09 |
| 申请号 |
US19870001361 |
申请日期 |
1987.01.08 |
| 申请人 |
RCA LICENSING CORPORATION |
发明人 |
DEVILBISS, WARREN C. |
| 分类号 |
G04G3/00;G04G7/00;(IPC1-7):G04F5/00;H04N5/262 |
主分类号 |
G04G3/00 |
| 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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