The principle of alternating magnetic field acoustomagnetic identification of acousto-magnetic tags: First, the center frequency of the signal is 58kHz, and the bandwidth is 57.8kHz to 58.2kHz (0.4kHz). It is the narrowest among all electronic anti-theft systems, so it is extremely unlikely to be received Interference causes false alarms.
The second is the process of the system determining the tag signal. When the transmitting signal is turned off, the receiver receives 6 times (adjustable) resonance signal continuously. If the power and frequency of the resonance signal are the same each time, it is regarded as a tag signal; if it is an external interference signal, it cannot be generated within one second The same signal 6 times; repeat the above identification process, can accurately determine the tag signal, and achieve almost zero false alarm operation.