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:
Jan. 18, 2000
Filed:
Sep. 23, 1996
Akira Takayama, Fukushima-ken, JP;
Michihiro Komatsu, Fukushima-ken, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
A double conversion television tuner capable of receiving analog and digital telecasts and having a reduced number of frequency conversion stages with fewer oscillators to minimize beat disturbances between local oscillation signals, the tuner being made up of fewer circuit components costing less than conventional tuners to manufacture. The inventive tuner comprises a first frequency conversion stage for converting in frequency a channel-select received signal to a first intermediate frequency signal to be output, a second frequency conversion stage for converting in frequency the first intermediate frequency signal to a second intermediate frequency signal to be output, and an analog and a digital demodulator for demodulating the second intermediate frequency signal. The local oscillation signal of the second frequency conversion stage is switched to a first frequency if the base-band signal of the channel-select received signal is an analog signal, and to a second frequency if the base-band signal is a digital signal, the second frequency being higher than the first frequency.