Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1978-10-24
1981-10-20
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333150, 333196, 455179, H03H 964, H03H 968
Patent
active
042963915
ABSTRACT:
A surface-acoustic-wave filter for a channel selection tuning system of a television receiver includes at least two comb filter elements, each of which comprises an input transducer provided on a piezoelectric substrate and adapted to convert an input electrical signal into an elastic surface wave, and first and second output transducers disposed on the substrate for receiving the elastic surface wave propagating in the same direction from the input transducer. The first and second output transducers are positioned from the input transducer with different distances. The transducers of the two comb filter elements are so designed that the respective comb filter elements respond to frequencies of different program channel bands over for example VHF and UHF bands. The distances of the first and the second output transducers from the input transducer in the wave propagating direction are so predetermined that reciprocal of the difference in delay time between the electrical signals derived from the first and second output transducers is equal to a divisor of an interchannel frequency difference in the corresponding channel band.
REFERENCES:
patent: 3755761 (1973-08-01), Hartmann
patent: 3831116 (1974-08-01), Davis, Jr. et al.
patent: 3858118 (1974-12-01), Daniel
patent: 4054841 (1977-10-01), Henaff et al.
patent: 4115744 (1978-09-01), Lewis
Adkins-"Fast Frequency Hopping with Surface Acoustic Wave (SAW) Frequency Synthesizers," Conference: Proceedings of The 30th Annual Symposium in Frequency Control, Atlantic City, N.J., U.S.A., 2-4 Jun. 1976, pp. 367-370.
Japanese Laid-Open Patent Application No. 49-8150, laid open Jan. 24, 1974, 4 pages.
Japanese Laid-Open Patent Application No. 49-8151, laid open Jan. 24, 1974, 3 pp.
Hazama Katashi
Yuhara Akitsuna
Hitachi , Ltd.
Nussbaum Marvin L.
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