Modulators – Phase shift keying modulator or quadrature amplitude modulator
Reexamination Certificate
2011-01-18
2011-01-18
Chang, Joseph (Department: 2817)
Modulators
Phase shift keying modulator or quadrature amplitude modulator
C332S105000, C329S304000, C375S261000
Reexamination Certificate
active
07872544
ABSTRACT:
A modulation/demodulation apparatus according to an embodiment of the present invention includes a sine wave generating circuit configured to output two sine waves which are orthogonal to each other and have equal amplitude, an orthogonal modulator connected to the sine wave generating circuit and configured to modulate the sine waves to generate a modulated signal, a detecting section configured to detect amplitude fluctuation in the modulated signal, a multiplying section configured to multiply the modulated signal and the amplitude fluctuation detected by the detecting section together, and an orthogonal demodulator configured to demodulate the modulated signal multiplied with the amplitude fluctuation by the multiplying section to generate a demodulated signal.
REFERENCES:
patent: 5771263 (1998-06-01), Kanazawa et al.
patent: 6560449 (2003-05-01), Liu
patent: 6931343 (2005-08-01), Webster et al.
patent: 2001-7882 (2001-01-01), None
Chang Joseph
Kabushiki Kaisha Toshiba
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
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