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1. 发明公开

EP0768756A3 Receiver and frequency synthesizer-tuner for the same 失效
标题翻译：接收器和调谐为频率合成
公开(公告)号：EP0768756A3
公开(公告)日：1998-07-08
申请号：EP96116271
申请日：1996-10-10
申请人： PIONEER ELECTRONIC CORP
发明人： YAMAMAOTO YUJI , ICHIKAWA TOSHIHITO
IPC分类号： H03J1/00 , H03L7/113 , H03J5/02
CPC分类号： H03L7/113 , H03J1/005
摘要： An apparatus for acquiring tuning for a tuning frequency at a high speed is disclosed. In a receiver including a receiving unit (4) incorporating a VCO (4a), control section (2) and a tuning control unit (5), the tuning control unit holds the inputted tuning frequency information at the designated address in accordance with the storage designation signal supplied from said control unit and of controlling the oscillating frequency of the VCO based on the tuning frequency information held at the designated address in accordance with the read designation signal supplied from said control unit. This receiver can shorten the tuning time in exchanging the tuning frequency. Further, in a frequency synthesizer tuner comprising a frequency comparing means for acquiring a signal indicative of a frequency difference between a target tuning frequency and an oscillation frequency of VCO in a frequency comparison loop so that the tuning frequency is adjusted, a count time setting means (107,Fig.8) is provided for setting the count time for measuring the oscillating frequency of the VCO used by the oscillating comparison means, and the count time is increased whenever measurement of the oscillating frequency of the VCO is repeated by the frequency comparison means. This frequency synthesizer tuner can greatly shorten the time taken for the oscillating frequency of the VCO to coincide with the target tuning frequency.

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