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:
May. 26, 1981
Filed:
Oct. 13, 1978
Applicant:
Inventors:
Toshinori Murata, Yokohama, JP;
Shigeo Matsuura, Yokohama, JP;
Assignee:
Hitachi, Ltd., , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B / ;
U.S. Cl.
CPC ...
455179 ; 455161 ; 455255 ;
Abstract
A channel selection apparatus comprises a sweep control voltage generator driven by a circuit for sweeping the local oscillation signal frequency in an electronic tuner. The local oscillation signal frequency sweeping circuit includes an arrangement for increasing the rate of sweeping the local oscillation signal frequency only when the latter is being changed not in the vicinity of a destined frequency. The apparatus may further comprise another arrangement for preventing an eventual excessive sweeping beyond the destined frequency.