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:
Feb. 18, 2003
Filed:
Dec. 20, 1999
Cable television (catv) tuner for enhanced signal communication between subscribers in a catv system
Mitsumi Electric Co., Ltd., Tokyo, JP;
Abstract
A CATV tuner apparatus includes a first low-noise amplifier which amplifies a level of an input signal received at an input terminal, the first low-noise amplifier having an adequately small noise figure to allow the received input signal to be amplified with no substantial degradation of a carrier-to-noise ratio of the input signal. An automatic gain control detects the level of the signal amplified by the first low-noise amplifier and adjusts an amplitude of the signal before passing the signal through the automatic gain control. A band-pass filter eliminates out-of-band signal components from the signal received from the automatic gain control and passes only in-band signal components through the band-pass filter. A second low-noise amplifier amplifies a level of the signal received from the band-pass filter. A frequency synthesizer produces an intermediate frequency signal at an output terminal through a multiplication of a frequency of the signal, amplified by the second low-noise amplifier, by an oscillation frequency.