Television – Receiver circuitry – Demodulator
Reexamination Certificate
2006-08-29
2006-08-29
Tran, Trang U. (Department: 2622)
Television
Receiver circuitry
Demodulator
C348S641000, C348S725000, C375S260000, C375S326000
Reexamination Certificate
active
07098967
ABSTRACT:
Frequency conversion into a first intermediate frequency which is higher than a received frequency band is performed for a received signal by using a mixer and a PLL. Next, an output of the mixer is frequency converted into a second intermediate frequency of a base band by using a quadrature mixer formed by mixers and a phase shifter. At this time, a frequency of the local oscillation signal of a PLL supplied to the quadrature mixer is controlled so as to be switched, depending on a position of the received segment, between a frequency which is higher than the first intermediate frequency and a frequency which is lower than the same.
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Hidenori Takeuchi et al., A Single-Chip RF Front-End for the Digital Sound Broadcasting, WAM 10.8, 2001, pp. 114-115, IEEE.
Fujishima Akira
Iwaida Mineyuki
Kanno Ippei
Oba Yasuo
Ozeki Hiroaki
Matsushita Electric - Industrial Co., Ltd.
Smith Patent Office
Tran Trang U.
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