The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 19, 2000
Filed:
Nov. 25, 1996
Keiji Kobayashi, Gunma-ken, JP;
Sakae Sugayama, Ota, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
The capacitance value of a variable capacitance element of an RF tuning circuit is controlled in accordance with a control signal Vx. When an automatic search start signal is supplied to a frequency control circuit, frequencies of the local oscillation signal are changed and received frequencies are changed. A storage circuit stores the control data for each predetermined frequency corresponding to the frequency characteristic of the tuning element. When local oscillation frequencies are changed in accordance with an automatic search start signal, an arithmetic circuit computes a control signal Vx in accordance with the data corresponding to the changed received frequency and the control data and thereby, the variable capacitance element is controlled in accordance with the control signal Vx and tuning frequencies are changed so that a tuning frequency coincides with a received frequency. Under the above state, when the electric-field intensity of a received signal reaches a certain level or higher, the frequency control circuit stops the change of frequencies of a local oscillation signal and stops automatic broadcasting-station selection.