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Patent Searching and Data


Title:
AFC CIRCUIT
Document Type and Number:
Japanese Patent JPH1098355
Kind Code:
A
Abstract:

To reduce a settling time of a reception frequency, to quicken a start-up of a reception and to improve speech interruption in the case of mobile reception by storing a control voltage in a receiving state and applying the stored voltage to a local oscillator at the start of the reception.

The receiver receives a signal simulating a digital audio broadcast(DAB) with an accurate frequency from SG (a standard signal generator) 20. A control circuit 11 controls accurately an oscillating frequency of a local oscillator (VCO) 21, and an AFC(automatic frequency control) voltage is written in a memory 15 via a switch circuit 14. At application of power in the case of actual reception, an output of an OR circuit 17 is at a low level and a switch circuit 13 is connected to the L side. The VCO 21 starts the AFC operation with a voltage stored in the memory 15. After the lapse of a prescribed delay time by a delay circuit 18, an output of the OR circuit 17 goes to an H-signal, the switch circuit 13 is connected to the position of H-side and, the VCO 21 is controlled by an AFC voltage from the control circuit 11.


Inventors:
SASAKI KAZUTOSHI
Application Number:
JP25283196A
Publication Date:
April 14, 1998
Filing Date:
September 25, 1996
Export Citation:
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Assignee:
FUJITSU TEN LTD
International Classes:
H04B1/26; H03J7/02; H04J11/00; (IPC1-7): H03J7/02; H04B1/26