Phase locked loop frequency demodulator having an adjustable ban

Details Phase locked loop frequency demodulator having an adjustable ban Phase locked loop frequency demodulator having an adjustable ban

1985-05-08

1986-08-12

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329122, 329132, 455214, 455312, 358 23, H03D 300

Patent

active

046059040

ABSTRACT:
Video frequency demodulator having a phase-locked loop (P.L.L.) intended more specifically for receiving signals transmitted via satellites, in which the bandwidth of the loop is adjusted as a function of the signal
oise ratio for adapting the demodulation threshold. Measuring the signal
oise ratio is realized by sampling (10, 12, 25) briefly the demodulated output signal (13) at the beginning of a picture field scan, rectifying this signal (10) and comparing (7) the stored rectified signal (14) to a predetermined voltage value (21). The signal coming from the comparator (16) is applied to the gain-control input of a variable-gain amplifier (6) incorporated in the control loop.

REFERENCES:
patent: 3209271 (1965-09-01), Smith
patent: 4473801 (1984-09-01), Maurer et al.
patent: 4531148 (1985-07-01), Ohta et al.

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