Title:
【発明の名称】自動周波数制御方法及び回路
Document Type and Number:
Japanese Patent JP3070530
Kind Code:
B2
Abstract:
During operation of a receiver, only when frame synchronization is established, the set value that the frequency control circuit determines for the VCO (6) is periodically stored into a non-volatile memory (11) together with current ambient temperature information of the VCO (6). When information that power supply has been turned on or that a changing over of the reception channel has occurred is received from an apparatus control processor (13), one of the stored values of the non-volatile memory (11) is read back into the frequency control circuit (5) in response to the current ambient temperature of the VCO (6) by a control circuit (10) and switches (7, 8), and is used as the initial set value for the VCO (6). This decreases the time required for convergence of AFC and improves the synchronization acquisition characteristic of the receiver.
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Inventors:
Kenichiro Chiba
Application Number:
JP16492797A
Publication Date:
July 31, 2000
Filing Date:
June 09, 1997
Export Citation:
Assignee:
NEC
International Classes:
H03J7/02; H03J7/04; H03L1/02; H04B1/16; (IPC1-7): H04B1/16; H03J7/02
Domestic Patent References:
| JP7245563A | ||||
| JP1098355A | ||||
| JP722974A | ||||
| JP3136526A | ||||
| JP1032513A | ||||
| JP10276110A |
Attorney, Agent or Firm:
Yasuo Suzuki