Pulse or digital communications – Receivers – Angle modulation
Reexamination Certificate
2005-09-20
2005-09-20
Phu, Phuong (Department: 2631)
Pulse or digital communications
Receivers
Angle modulation
C375S376000, C455S315000, C455S316000
Reexamination Certificate
active
06947499
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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Frishauf Holtz Goodman & Chick P.C.
Icom Incorporated
Phu Phuong
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