AM digital demodulator
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United States of America Patent
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Aug 15, 1989
Grant Date -
N/A
app pub date -
Jun 17, 1988
filing date -
Jun 18, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An AM demodulator of a digital signal processing type wherein an analog AM signal is converted to a digital AM signal, the digital AM signal is squared and a one sample-delayed version of the digital AM signal is squared, these squared signals are added, and the square root of the resulting sum of the squared signals is extracted as an AM demodulated signal. The demodulator comprises a detector for detecting the level of a sum signal representing the sum of the squared signals, an upward bit shifter for bit shifting upwardly the sum signal on the basis of the detection output from the level detector, a polynomial calculator for approximately extracting the square root of the sum signal, and a downward bit shifter for bit shifting downwardly the output signal from the polynomial calculator.
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