AM digital demodulator

Details AM digital demodulator AM digital demodulator

1988-06-17

1989-08-15

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329145, 375 41, 375 94, H03D 102, H03K 902

Patent

active

048578592

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.

REFERENCES:
patent: 3792364 (1974-02-01), Ananias
patent: 4731796 (1988-03-01), Masterton et al.

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