H - Electricity – 03 – H
Patent
H - Electricity
03
H
365/1, 333/58, 3
H03H 9/64 (2006.01) H03H 9/145 (2006.01) H03H 9/68 (2006.01) H03H 9/72 (2006.01) H03J 5/24 (2006.01) H04B 1/16 (2006.01)
Patent
CA 1131373
ABSTRACT OF THE DISCLOSURE 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 trans- ducers 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 prede- termined that the 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.
314227
Hazama Katashi
Yuhara Akitsuna
Gowling Lafleur Henderson Llp
Hitachi Ltd.
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