Frequency modulation detector using digital signal vector processing
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United States of America Patent
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Jul 29, 1986
Grant Date -
N/A
app pub date -
Sep 21, 1984
filing date -
Sep 21, 1984
priority date (Note) -
Expired
status (Latency Note)
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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 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.
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