Demodulation filter for a signal modulated in binary frequency m

Wave transmission lines and networks – Coupling networks – Electromechanical filter

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333154, 333196, 375 45, 329116, H03H 9145, H03H 964

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active

045435472

ABSTRACT:
The invention relates to a filter for demodulating signals modulated in frequency in binary manner by the switching of two frequencies F.sub.a and F.sub.b.
On a piezoelectric crystal, is produced two surface wave filtering units, each comprising a transmitting transducer and a receiving transducer with interdigitated electrodes. The number of electrodes of the receiving transducer of the first unit is substantially equal to twice (2F.sub.a -F.sub.b)/2(F.sub.b -F.sub.a ) with a spacing of v/(2F.sub.a -F.sub.b), in which v is the propagation rate. In the case of the second unit, this number is approximately twice (2F.sub.b -F.sub.a)/2(F.sub.b -F.sub.a) with a spacing of v/(2F.sub.b -F.sub.a). The receiving transducers are preferably subdivided in each case into two juxtaposed transducers, whereof one is set back with respect to the other by a distance of approximately v/4F.sub.a for the first unit and v/4F.sub.b for the second.

REFERENCES:
patent: 3891929 (1975-06-01), Carr et al.
patent: 4217563 (1980-08-01), Vale
patent: 4291275 (1981-09-01), Nossen
patent: 4315228 (1982-02-01), Moore

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