Digital FM demodulator

Details Digital FM demodulator Digital FM demodulator

1983-04-01

1985-09-24

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329107, 375 82, H03D 300

Patent

active

045435324

ABSTRACT:
Intermediate frequency FM signals are converted to digital form and the digital words of successive samples are clocked into a three place shift register. The sum of the values in the first and third stages of the register is divided by the value in the middle stage and the quotient values are then averaged by groups or as a moving average to provide the demodulated signal. Errors in the operation of the divider circuit can be avoided by detecting null values of the content of the middle cell of the shift register to suppress erroneous quotients, or else the values from which the quotients are formed are both squared before dividing. In the latter case the dc component can be eliminated from the output by subtracting a constant.

REFERENCES:
patent: 3803501 (1974-04-01), Jones, Jr.
patent: 4455533 (1984-06-01), Moraillon

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