Surface wave discriminator system

Details Surface wave discriminator system Surface wave discriminator system

1974-08-20

1976-10-19

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

325349, 325487, 329137, 329145, 329204, 333 30R, 333 72, H03D 316

Patent

active

039873676

ABSTRACT:
The invention relates to surface wave discriminator systems comprising a substrate on the surface of which are arranged two electromechanical filters each incorporating two delay lines of dissimilar delay length. The amplitudes of the alternating voltages transmitted by said filters obey laws of variation as a function of the modulating quantity which take the form of sinusoidal half waves, offset by a quarter of a period, making it possible after differential detection to obtain a frequency or phase discrimination characteristic.

REFERENCES:
patent: 3550045 (1970-12-01), Adler
patent: 3582540 (1971-06-01), Adler et al.
patent: 3582840 (1971-06-01), DeVries
patent: 3626309 (1971-12-01), Knowles
patent: 3757256 (1973-09-01), Whitehouse et al.
patent: 3810257 (1974-05-01), Jones et al.
patent: 3835422 (1974-09-01), Hartemann

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