Digital FM demodulator using delayed signal product with arctang

Details Digital FM demodulator using delayed signal product with arctang Digital FM demodulator using delayed signal product with arctang

1986-06-11

1988-06-07

Masinick, Michael A.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

375 80, H04B 116

Patent

active

047502142

ABSTRACT:
FM signals are demodulated with lower distortion and expenditure of less computing time by digitizing the signals using an A/D converter of predetermined sample frequency and down-converting the signals to their base band quadrature components. The quadrature components are delayed by one sample period, and the complex cross-product of current quadrature components and the delayed quadrature components from the immediately preceding A/D sample period is taken. The arctangent of the resulting cross-product is taken by calculating the ratio of the imaginary and real components thereof to produce a value which is representative of the original modulating signal.

REFERENCES:
patent: 4090145 (1978-05-01), Webb
patent: 4317210 (1982-02-01), Dekker et al.
patent: 4481646 (1984-11-01), Godard
patent: 4560941 (1985-12-01), Welles, II. et al.
patent: 4583048 (1986-04-01), Gumacos et al.

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