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:
Apr. 10, 1984
Filed:
Sep. 24, 1982
Shizuo Hayashida, Saitama, JP;
Akinori Masuko, Saitama, JP;
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Abstract
In a channel selection system of a television receiver set using a frequency synthesizer system, the local oscillator output of a voltage controlled oscillator in a tuner is coupled to through a prescaler to a programmable frequency divider. To a frequency division ratio specification input terminal of the programmable frequency divider is coupled a frequency division ratio setting data from a frequency division ratio memory. When the broadcast wave frequency is deviated from a predetermined value due to the frequency division ratio setting data, a fine tuning data corresponding to the deviation and a direction specification data representing the direction of the deviation are memorized in a random-access memory (RAM). The fine tuning data read out from the RAM is coupled to a fine tuning signal generator where it is added to or subtracted from the frequency division ratio setting data prevailing in the programmable frequency divider. The data obtained from the fine tuning signal generator as a result of the addition or subtraction is coupled as a new frequency division ratio setting data to a frequency division ratio specification input terminal of the programmable frequency divider.