Time-shared control type commodity steal preventing test system

Abstract

The time-sharing control type commodity anti-burglary detection system incldues: D.C. power supply, emitter and receiver, and is characterized by that the interior of D.C. power supply is equipped with a time reference signal generator, and the interior of emitter is equipped with a time-sharing signal generation circuit formed from chip microprocessor integrated circuit and four-stage low-pass filter and wide-band amplification and time-sharing modulation circuit formed from preamplification circuit, wide-band amplifier and analog switch integrated circuit. The interior of receiver is equipped with time-sharing sampling interruption pulse generation circuit formed from waveform conversion circuit and regulation circuit and DSP processing system formed from integrated circuit, exclusion element and crystal oscillation element. Its time-sharing mode can greatly increase capacity of system and raise detection accuracy, under the condition of that its system network capacity is 400 units, its detection distance can be 1.2 m for flexible label and 1.6 m for hard label.

Description

technical field [0001] The invention relates to a commodity anti-theft detection system, in particular to a time-sharing control commodity anti-theft detection system. Background technique [0002] With the rapid development of my country's national economy and the continuous improvement of people's living standards, my country's supermarkets have achieved rapid development and become the dominant form of retail business. Various self-selected supermarkets are loved by customers for their unique open-shelf sales methods. But on the other hand, open-shelf self-shopping also brings difficulties in operation and management, especially the sharp increase in commodity theft, which directly leads to the reduction of economic benefits of shopping malls and causes many social problems. The existing commodity anti-theft detection device is exactly a kind of high-tech electronic anti-theft device developed in view of the phenomenon of commodity theft occurring in supermarket operati...

AI Technical Summary

Problems solved by technology

[0007] However, it has been found in actual use that the wired synchronization method of the commodity anti-theft detection device still has some shortcomings: 1) the laying of a large number of synchronization lines brings difficulties to on-site construction and increases the cost

2) The layout of the synchronization line has a great influence on the anti-interference effect of the system

3) The synchronization line will bring various interference signals, and even become a source of interference in some occasions. When the detection points that need to be synchronized are far away or when the number of connected units is large, the mutual interference between the radio frequency commodity anti-theft detection devices can be suppressed. Ineffective

4) When multiple adjacent merchants use the radio frequency commodity anti-theft detection device at the same time, since only one antenna can be designated as the main transmitter, merchants need to coordinate their use, and the inconsistency of commercial interests often leads to unsmooth coordination

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