The present invention relates to a system for automatically calling 112 and, more specifically, to a system for automatically calling 112 having wire/wireless transmitters/receiver of an amplitude shift keying (ASK) manner using a surface acoustic wave (SAW) resonator. The system for automatically calling 112 of the present invention comprises: a plurality of transmitters which are installed in certain positions along a moving line of a user, have external control dip switches exposed in the outside to be operated by the user, and generate and transmit intrinsic emergency call signals if the user operates the external control dip switches when a crime occurs; and a single receiver for receiving the emergency call signal transmitted from at least one of the transmitters, determining whether the received emergency call signal is a signal transmitted from the transmitter installed in the same store; connecting a call to an emergency call phone number corresponding to the received emergency call signal among the preintputted and prestored emergency call phone numbers if it is determined that the received emergency call signal is the signal transmitted from the transmitter installed in the same store, and transmitting, to the emergency call phone number by a call line, the sound of the crime scene through a microphone after a certain time is elapsed. Therefore, the system, which comprises the single receiver connected in wire/wirelessly to the transmitters installed in certain positions of the same store, can prevent interference between the RF signals transmitted from the transmitters within the same RF receiving area by allocating an intrinsic identification code to each of the transmitters.
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