Device for determining the moment when competitors in a race are

Details Device for determining the moment when competitors in a race are Device for determining the moment when competitors in a race are

1980-03-25

1981-06-16

Groody, James J.

Communications: electrical

Selective

Having indication or alarm

340 23, 340 32, 340323R, G08C 2100

Patent

active

042740762

ABSTRACT:
In this system for determining the moment when competitors in a race pass the finish line, each competitor is fitted with a transmitter. Arranged at the finish line are at least two receiving antennas, the signals from which are combined in opposite sense so as to form a difference signal. A system output signal then is produced which has a leading edge that occurs when the difference signal crosses zero. This output signal indicates that a competitor has passed the finish line.

REFERENCES:
patent: 3546696 (1970-12-01), Waters et al.
patent: 3795907 (1974-03-01), Edwards
patent: 3825889 (1974-07-01), Koerner
patent: 3946312 (1976-03-01), Oswald et al.
patent: 4074117 (1978-02-01), De Lorean et al.

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