Patterned transducer apparatus for correcting spurious signals i

Details Patterned transducer apparatus for correcting spurious signals i Patterned transducer apparatus for correcting spurious signals i

1990-01-19

1991-06-11

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

307 105, 310313R, 310313D, G06F 700

Patent

active

050236059

ABSTRACT:
The invention features a theft resistant security system for motor vehicles. The system has receptacle with a coupling coil. A SAW (surface acoustical wave) device associated with the receptacle for relative movement thereto is also provided. The SAW device has a code and its own coupling coil for interaction with the receptacle coupling coil. A testing mechanism is connected to the receptacle for determining whether the code of the SAW device is valid for operation of the motor vehicle. Problems of crosstalk and wave reflection may produce spurious code pulses in systems of this type. The invention provides techniques for eliminating or reducing these unwanted pulses.

REFERENCES:
patent: 3573673 (1971-04-01), DeVries
patent: 4006438 (1977-02-01), Bennett
patent: 4066985 (1978-01-01), Kung
patent: 4462011 (1984-07-01), Ward

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