Coded data generation or conversion – Code generator or transmitter – With variable pulse spacing or grouping
Reexamination Certificate
2007-08-08
2009-06-02
Nguyen, Linh V (Department: 2819)
Coded data generation or conversion
Code generator or transmitter
With variable pulse spacing or grouping
C341S110000, C341S155000, C341S174000, C341S177000, C375S322000, C375S324000, C375S326000, C375S344000, C455S086000, C455S130000, C455S311000, C455S319000
Reexamination Certificate
active
07541966
ABSTRACT:
An apparatus for demodulating a modulated signal comprises an analog to digital converter (2, 12) for converting an analog modulated input signal to a digital signal. The analog to digital converter is arranged to sample the input signal at a predetermined sampling rate. A digital down converter (4, 14) then receives the digital signal at the sampling rate. The digital down converter has an associated digital intermediate frequency and reduces the frequency of the digital signal to one quarter of the sampling rate. A low pass filter (6, 16) filters selected frequencies from the digital signal. A frequency offset stage (8, 18) applies a modification to the frequency of the filtered signal to reduce frequency offset therein, and a differential demodulator (10, 20) demodulates the signal after modifying the frequency to reduce the frequency offset. There is also disclosed a method for demodulating a signal.
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Changqing Xu
Masayuki Tomisawa
Ren Tan Kai
Saigui Hu
Tingwu Wang
Nguyen Linh V
Oki Techno Centre (Singapore) Pte Ltd
Rabin & Berdo P.C.
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