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:
Oct. 23, 2001
Filed:
Mar. 09, 1998
Michihiro Komatsu, Soma, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
Described herein is an analog-digital broadcast shared receiving tuner for receiving therein a low-level broadcast signal of a digital broadcast assigned to a vacant channel of an analog broadcast and having first and second frequency conversion stages each comprised of a frequency mixer and a local oscillator. A variable attenuator capable of performing switching between predetermined attenuation and zero attenuation is electrically connected between an intermediate frequency amplifier for amplifying a first intermediate frequency signal outputted from the first frequency conversion stage and the frequency mixer of the second frequency conversion stage, which follows the intermediate frequency amplifier, so that the attenuation of the variable attenuator reaches zero attenuation upon reception of an analog broadcast and the attenuation thereof reaches predetermined attenuation upon reception of a digital broadcast.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile