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:
Dec. 04, 1990
Filed:
Nov. 15, 1988
Ken Satoh, Kashiwa, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A tuner for use in two systems utilizes a determining circuit to determine whether or not a baseband signal, after demodulation includes a sound carrier. If a sound carrier is present, the determining circuit determines that the received television signal is a television signal in the NTSC system, if the carrier signal is not present, a television signal in the MUSE system. When the received television signal is a television signal in the NTSC system, switches are activated such that the baseband signal is applied to a signal processing circuit for video and a signal processing circuit compatible with the NTSC system. An averaging AFC is selected by these switches. On the other hand, when the received television is a television signal in the MUSE system, switches are activated such that the baseband signal is applied to a MUSE decoder and a keyed AFC is selected.