Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Reexamination Certificate
2011-04-26
2011-04-26
Pascal, Robert (Department: 2817)
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
C329S363000, C375S346000, C375S349000, C455S312000, C455S296000, C381S015000, C381S094100
Reexamination Certificate
active
07932775
ABSTRACT:
A digital demodulation device for demodulating an amplitude modulation (AM) signal whose carrier has a first frequency includes: a processing circuit for performing first path digital processing and second path digital processing according to a second frequency and digital values of the AM signal, where the first path digital processing represents performing down conversion by mixing the AM signal with a first sinusoidal signal whose frequency is equal to the second frequency, the second path digital processing represents performing down conversion by mixing the AM signal with a second sinusoidal signal whose frequency is equal to the second frequency, the second frequency is equal to the first frequency plus a predetermined frequency shift, and the second sinusoidal signal is orthogonal to the first sinusoidal signal; and an output stage for outputting an output signal according to processing results of the first path digital processing and the second path digital processing.
REFERENCES:
patent: 7672411 (2010-03-01), Colmer et al.
Hsu Winston
Johnson Ryan
Margo Scott
Mediatek Inc.
Pascal Robert
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