发明授权
US6011818A Automatic frequency control method 失效
自动频率控制方式

Automatic frequency control method
摘要:
The present invention relates to a frequency control apparatus for a television and a video cassette tape recorder, and more particularly to an automatic frequency control method wherein a frequency value of a voltage controlled oscillator is increased or decreased and stored by determining whether an oscillator is in a range capable of operating a phase locked loop when an oscillation frequency of the voltage controlled oscillator of the phase locked loop is not synchronized with the intermediate frequency when a frequency is automatically controlled by comparing phases and frequencies of the phase locked loop and the intermediate frequency.
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