Process for demodulating a frequency-modulated signal and demodu

Details Process for demodulating a frequency-modulated signal and demodu Process for demodulating a frequency-modulated signal and demodu

1981-08-07

1984-06-19

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329145, 455214, H03D 300

Patent

active

044555334

ABSTRACT:
A demodulator is provided comprising: a sampler for sampling the signal to be demodulated at a rate equal to four times a frequency F' situated in the frequency band of the signal; a device for determining the position, in a reference frame Oxy, of the rotating vector associated with the signal to be demodulated, by calculating the arc tangent of a ratio R=(y'(t)/x'(t)) between a value x'(t) of a signal sample and an average y'(t) effected on the values x'(t-1/4F') and x'(t+1/4F') of the signal samples; and means for determining an estimation of the frequency variation between two times separated by (1/F'), by comparing the position of the rotating vector at these times.

REFERENCES:
patent: 3670251 (1972-06-01), Shintani et al.
patent: 3956623 (1976-05-01), Clark et al.
patent: 4090145 (1978-05-01), Webb

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