Transmitter unit for an anti-theft system of a motor vehicle, an

Details Transmitter unit for an anti-theft system of a motor vehicle, an Transmitter unit for an anti-theft system of a motor vehicle, an

1998-02-20

2000-08-22

Le, Amanda T.

Pulse or digital communications

Pulse position, frequency, or spacing modulation

375310, 375377, 34082543, 3408256, 34082564, 341176, 341181, 341182, G08C 1922

Patent

active

061083771

ABSTRACT:
A transmitter unit generates a carrier signal in the form of a periodic bipolar signal. The carrier signal has intrapulse periods between two pulses of different polarity. A transmission antenna is operated with the bipolar signal. To prevent the harmonic oscillations of the transmitted signals from having excessively great amplitudes, the intrapulse period is defined such that the amplitude of the first harmonic of the transmitted oscillation, ascertained by Fourier analysis, is greater than 90% and the amplitude of the third harmonic oscillation is less than 25%, in comparison with the amplitude of the fundamental oscillation of a rectangular oscillation without intrapulse periods.

REFERENCES:
patent: 3363199 (1968-01-01), Besslich
patent: 4471344 (1984-09-01), Williams
Dieter Nuhrmann: Professionelle Schaltungstechnik, Band 1/Teil 2, pp. 111-112, Franzis Verlag, 1996, ISBN 3-7723-4002-4.

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