Activation and/or deactivation system for a security device, in particular for a vehicle

摘要

The system includes a unit for frequency band widening (5), whereby in a transmitting system (1), a bandwidth of the carrier frequency (f0) of the coded data is increased before the transmitting of the coded data. The converted data is received by a receiver unit (2), and before comparison of the data, the data is fed back in a unit for frequency band narrowing (10) of the receiver unit on the original carrier frequency.