Demodulator
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United States of America Patent
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Mar 26, 2002
Grant Date -
N/A
app pub date -
Dec 11, 1998
filing date -
Dec 12, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention presents an apparatus capable of demodulating stably if there are time-course changes in the constituent parts in a demodulator of digital modulated signal. This demodulator comprises an operator for setting the oscillation frequency of a local oscillator 2, and within a passing frequency band of a band pass filter BPF 3, the operator controls the local oscillator 2 so that the frequency of the output signal of a first mixer 1 may settle within a control band in a controllable frequency band of an AFC feedback loop composed of an orthogonal detector 4, a carrier regenerator 9, a frequency error detector 10, a frequency controller 11, a signal selector 12, a D/A converter 13, and a VCO 14, and a local carrier is issued from the local oscillator 2 to the first mixer 1.
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