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. 10, 2000
Filed:
Oct. 21, 1998
Syuuji Matsuura, Ikoma, JP;
Sharp Kabushiki Kaisha, Tokyo, JP;
Abstract
A cable modem tuner includes, in the same casing, an up-stream circuit to transmit an up-stream data signal to a CATV station, and a reception circuit for receiving a down-stream signal via a HPF that removes the up-stream data signal. The reception circuit includes a select circuit that selects a signal of a desired frequency band out of one of three frequency bands, a signal processing block including three local oscillation circuits to convert a signal of a desired frequency band into an intermediate frequency signal of a desired channel using an oscillation signal of a corresponding oscillation circuit, and a down converter with a local oscillation circuit converting an applied signal into a signal for demodulating a received signal. The down converter provides a baseband signal used to demodulate a received signal by the QAM when a digital signal modulated by the QAM is received. Therefore, the cable modem tuner includes an analog received signal processing circuit and a digital received signal processing circuit in the same casing, and has a structure particularly suitable to a set top box.