Method and apparatus for demodulating time-discrete frequency-mo

Details Method and apparatus for demodulating time-discrete frequency-mo Method and apparatus for demodulating time-discrete frequency-mo

1982-11-15

1986-01-28

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329137, 375 80, H03D 100

Patent

active

045674426

ABSTRACT:
Method for demodulating time-discrete frequency-modulated signals. The method includes combining sequential equidistant samples of a signal to be demodulated for deducing the instantaneous frequency of the signal to be demodulated. The improvement includes dividing a first vector sum of samples forming a dividend by a second vector sum of samples forming a divisor. Each sample is a complex number represented by a vector. The vector sum of the dividend has a phase that is offset from the vector sum of the divisor by a phase angle equal to n times pi, wherein n is any integer. The division of the vector sums is advantageously performed by a ROM in which all the division results have been stored and which can be accessed by the divisor and the dividend for quickly obtaining the division result. Delay lines and summing circuits are used for combining the samples into the dividend and the divisor.

REFERENCES:
patent: 3944931 (1976-03-01), Usami et al.
patent: 4064408 (1977-12-01), Hon et al.
patent: 4431916 (1984-02-01), Couch
Manes, G. F., "Experiments on Variable Delay and Time Base Variation Using a Programmable SAW Device", IEEE, 1977, Ultrasonics Symposium Proceedings, pp. 619-622, (Phoenix, AZ, USA, Oct. 26-28 77) (Catalog #77CH1264-ISU).

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