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. 04, 1982
Filed:
Jun. 03, 1980
Shutoku Watanabe, Yokohama, JP;
Hitachi, Ltd., , JP;
Abstract
A channel selection apparatus of a television receiver having a sequential shift signal input terminal for receiving a sequential shift signal to sequentially shift a selected channel position and an electronic tuning type channel selection IC having a defeat signal output terminal for producing a pulse output when the selected channel position changes and a plurality of channel selection output terminals for producing outputs indicative of the channels to be selected. The channel selection apparatus comprises a synchronizing signal discrimination circuit having a NAND gate and a charge/discharge circuit for detecting a synchronizing signal component appearing in a synchronizing signal separation circuit, a wave shaping circuit for producing a pulse output of a predetermined pulse width when triggered by the output at the defeat signal output terminal, and a NAND gate coupled to the synchronizing signal discriminating circuit, the wave shaping circuit and the sequential shift signal input terminal of the channel selection IC for producing a signal to sequentially shift the selected channel position by applying a signal to the sequential shift signal input terminal when the synchronizing signal discrimination circuit does not detect the synchronizing signal and the wave shaping circuit produces no output, and producing a signal to stop the sequential shift operation when the synchronizing signal discrimination circuit detects the synchronizing signal. This arrangement is particularly useful in selecting a channel which is receiving a broadcasting television station signal when the television receiver is turned on.