Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1984-09-21
1985-12-24
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329124, 329126, 455214, 375 82, H03D 300
Patent
active
045609411
ABSTRACT:
A frequency modulated signal is converted into a pair of baseband signals by mixing the signal with a pair of phase-quadrature reference signals of substantially carrier center frequency. The double reference frequency component of each of the baseband signals is filtered to obtain I and Q signals. The I and Q signals constitute in rectangular coordinates the components of a vector represented in polar coordinates by R and .theta. where R is the maximum amplitude of the I and Q signals and .theta. is the instantaneous angle represented by the arctangent of the I signal divided by the Q signal. The I and Q signals are inverted to provide respective -I and -Q signals. The I, -I, Q, -Q signals are sampled to provide a sequence of sets of signal samples. For each set of signal samples the angle .theta. is obtained. A sequence of changes in the values of the angle .theta. over successive sampling periods is obtained and represents the deviation in frequency of the FM carrier corresponding to changes in amplitude of the modulating signal.
Noujaim Sharbel E.
Welles II Kenneth B.
Davis Jr. James C.
General Electric Company
Grimm Siegfried H.
Snyder Marvin
Zaskalicky Julius J.
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