H - Electricity – 03 – H
Patent
H - Electricity
03
H
333/58
H03H 9/64 (2006.01) H01P 1/20 (2006.01) H03H 9/02 (2006.01)
Patent
CA 1169504
ABSTRACT In order to suppress triple transit ghost images in a T.V. receiver, a surface wave acoustic filter is provided in which either the input or output transducer system, or both, includes both primary and dummy transducers, the echoes from which cancel each other totally. The dummy transducer is designed as a function not only of position along the acoustic beam path, but also as a function of the number of elemental transducers and their inter- digitated lengths; and the design also takes into account relevant electrical parameters including transducer admittances and any external or parasitic impedances under short circuit and open circuit conditions. These factors are taken into account not only for the primary transducer, but also for the dummy transducer. The result is a completely general phasor expression which establishes the design criteria for a dummy transducer to achieve echo phase opposition and amplitude equality, relative to a given primary transducer and a given external circuit under all frequency conditions. The result is complete echo cancellation over the entire bandwidth of the filter.
380001
Macrae & Co.
Zenith Radio Corporation
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