Angle demodulation apparatus, local oscillation apparatus,...

Details Angle demodulation apparatus, local oscillation apparatus,... Angle demodulation apparatus, local oscillation apparatus,...

2005-08-12

2009-08-18

Phu, Phuong (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S376000, C375S326000, C375S325000, C375S324000, C455S316000, C455S260000, C455S255000

Reexamination Certificate

active

07577215

ABSTRACT:
An FM modulation signal is mixed with a pair of first local oscillation signals to be converted to a pair of base band signals. The base band signals are respectively mixed a pair of second local oscillation signals. The resultant signals are added together, thereby yielding an IF signal which is in turn detected. The local oscillator generates a reference oscillation signal whose frequency corresponds to a carrier component of the IF signal and frequency-divides the reference oscillation signal, thus generating the second local oscillation signals. The frequency of the first local oscillation signal converges to the one that has a given ratio to the frequency of the reference oscillation signal.

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