Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed
Reexamination Certificate
2008-07-01
2008-07-01
Mai, Tan V. (Department: 2193)
Electrical computers: arithmetic processing and calculating
Electrical digital calculating computer
Particular function performed
Reexamination Certificate
active
07395290
ABSTRACT:
A digital filter and method of filtering frequency translate or shift a spectrum of a digital input signal and further filter a translated signal to reduce or attenuate frequency components in the spectrum of the input signal. The digital fitter includes first and second translators and a first filter. The first filter is connected between the first and second translators and is centered approximately at direct current (DC). The digital filter may further include a second filter, a third translator connected to an output of the second filter, a complex local oscillator connected to an input of each translator, and a complex-to-real converter connected to an output of the third translator. The method includes frequency translating the digital input signal and separately frequency translating a first translated signal after the first translated signal is filtered to produce a second translated signal.
REFERENCES:
patent: 5375146 (1994-12-01), Chalmers
patent: 6219088 (2001-04-01), Liu et al.
patent: 2001/0008549 (2001-07-01), Hashimoto
Agilent Technologie,s Inc.
Mai Tan V.
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