Digital demodulator for continuously phase or frequency modulate

Details Digital demodulator for continuously phase or frequency modulate Digital demodulator for continuously phase or frequency modulate

1984-12-17

1986-10-28

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329131, 329135, H03D 500

Patent

active

046201602

ABSTRACT:
A frequency and phase demodulating circuit provides direct frequency demodulation utilizing only addition, subtraction and multiplication steps. Division of signals is avoided, as is the need for a look-up table of trigonometric values corresponding to the results of such division. By maintaining a substantially constant input amplitude to a quadrature sampler, a number of approximations may be made without introduction of error. Compensation for actual signal variation, as well as for first order errors due to the approximation process of the invention, results in accurate frequency evaluation and avoids the necessity for differentiating an initial phase determination.

REFERENCES:
patent: 3970946 (1976-07-01), Matsuo
patent: 4336500 (1982-06-01), Attwood

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