Digital quadrature demodulator

Details Digital quadrature demodulator Digital quadrature demodulator

1972-02-08

1978-05-16

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

325324, 328109, 328135, 328140, 328151, 328166, 329 50, 329122, 329126, 329135, 329147, H03D 100, H03D 300, H03D 500

Patent

active

040901459

ABSTRACT:
A quadrature analog-to-digital sampler, operating at a minimum sampling rate equal to the bandwidth of the input signal provides a pair of quadrature related digital signals which are input to first and second digital computers. The first computer calculates the instantaneous amplitude of the input signal and the second computer computes the instantaneous phase of the input signal. A third digital computer acts on the output of the second computer and differentiates the instantaneous phase of the signal with respect to time to provide frequency modulation output.

REFERENCES:
patent: 3320552 (1967-05-01), Glasser
patent: 3327231 (1967-06-01), Guggenbuhl
patent: 3337796 (1967-08-01), Hentschel et al.
patent: 3458821 (1969-07-01), Clarridge
patent: 3490049 (1970-01-01), Choquet et al.

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