发明公开
- 专利标题： Automatic frequency control circuit
- 专利标题（中）： 自动售货机。
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申请号： EP92110360.2申请日： 1992-06-19
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公开(公告)号： EP0519489A1公开(公告)日： 1992-12-23
- 发明人: Kumagai, Yoshiaki, c/o Fujitsu Limited , Itaya, Eiji, c/o Fujitsu Limited , Endo, Yoichi, c/o Fujitsu Limited
- 申请人： FUJITSU LIMITED
- 申请人地址： 1015, Kamikodanaka, Nakahara-ku Kawasaki-shi, Kanagawa 211 JP
- 专利权人： FUJITSU LIMITED
- 当前专利权人： FUJITSU LIMITED
- 当前专利权人地址： 1015, Kamikodanaka, Nakahara-ku Kawasaki-shi, Kanagawa 211 JP
- 代理机构： Lehn, Werner, Dipl.-Ing.
- 优先权： JP147257/91 19910619; JP150381/91 19910621
- 主分类号： H03J7/06
- IPC分类号： H03J7/06
摘要：
In a first embodiment of the present invention, an AFC circuit comprises a frequency divider (24) for dividing a frequency of a local oscillation signal output from a voltage controlled oscillator, and a switch (15) for selecting an output signal of the frequency divider (24) or a pilot signal extracted from converted signals. While the pilot signal is not obtained, the switch selects the output signal of the frequency divider (24), to thereby construct a PLL to stabilize the frequency of the local oscillation signal.
In a second embodiment of the present invention, an AFC circuit comprises a frequency divider for selectively dividing a frequency of a pilot signal included in the converted signal. Various frequencies of the pilot signal can be dealt with by altering a division number in the frequency divider.
In a second embodiment of the present invention, an AFC circuit comprises a frequency divider for selectively dividing a frequency of a pilot signal included in the converted signal. Various frequencies of the pilot signal can be dealt with by altering a division number in the frequency divider.
公开/授权文献
- EP0519489B1 Automatic frequency control circuit 公开/授权日：1997-09-10
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