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In modern ani-theft systems they use frequency and phase modulation. Since the width of the signal is limited, it is possible to intercept the signal and then switch off the alarm at the right time.To ensure the noise immunity and secrecy manufacturers use more sophisticated codes using the methods of cryptography. Significant increase in noise immunity in modern ani-theft systems is possible using broadband signals.doaj:f38dc2f3fcf447b1b8e50b29dd5a2f37 fatcat:zo6pse2hyveg3f5tvhusavwjcy