An anti-jamming device applied to pos terminal wired audio communication
An anti-interference device, audio communication technology, applied in digital transmission system, electrical components, error prevention and other directions, can solve the problems of noise interference, small audio signal, POS machine and intelligent terminal can not communicate normally, to improve stability, Stable and reliable work
Active Publication Date: 2018-01-12
SHENZHEN YILIAN TECH
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Problems solved by technology
However, the audio signal output by the audio interface of existing mobile phones or other smart terminals is small, and it is susceptible to noise interference from equipment, transmission lines and the outside world, especially the noise interference generated by mobile phones with poor sound quality will reduce the performance of the POS machine receiver. It will be greatly affected, and seriously, it will cause the POS machine and the smart terminal to fail to communicate normally
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[0036] The principles and features of the invention will be described below in conjunction with the accompanying drawings, and the examples given are only used to explain the invention and are not intended to limit the scope of the invention.
[0037] The present invention is an anti-jamming device applied to POS terminal wired audio communication, and the anti-jamming device is arranged at the receiving end of the POS terminal; figure 1 It is a structural schematic diagram of an anti-jamming device applied to POS terminal wired audio communication according to the present invention, such as figure 1 As shown, an anti-jamming device applied to POS terminal wired audio communication of the present invention includes: audio signal input terminal 10, DC isolation circuit 11, high frequency filter circuit 12, Schmitt trigger unit 13, microcontroller unit 14.
[0038] figure 2 It is a schematic structural diagram of a specific embodiment of the Schmitt trigger unit of the presen...
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The invention discloses an anti-jamming device applied in wired audio communication of POS terminals. The anti-jamming device is arranged at the receiving end of the POS terminal; Filter circuit, Schmitt trigger unit, microcontroller unit. The present invention can greatly improve the stability of communication by performing double anti-interference design on the receiving end of the POS machine; the audio signal transmitted by the mobile phone end can be effectively filtered, amplified, and anti-interference processed by the hardware circuit with Schmidt function. Interference pulses with low interference amplitude are effectively filtered, and then through the signal processing of the microcontroller unit, the interference pulses with large interference amplitude in the audio signal are filtered to restore the effective signal; thus enabling the POS terminal to achieve anti-interference Function, which reduces the impact of the interference of the audio port of the mobile phone on the signal received by the POS terminal, and the POS terminal works more stably and reliably.
Description
technical field [0001] The invention relates to the communication technology of a payment device by swiping a card, and more specifically, the invention relates to an anti-jamming device applied in wired audio communication of a POS terminal. Background technique [0002] Mobile POS machines communicate with smart terminals (such as mobile phones and tablet computers) through wired audio interfaces, and are favored by merchants because of their versatility, low cost, and easy operation. However, the audio signal output by the audio interface of existing mobile phones or other smart terminals is small, and it is susceptible to noise interference from equipment, transmission lines and the outside world, especially the noise interference generated by mobile phones with poor sound quality will reduce the performance of the POS machine receiver. It will be greatly affected, and seriously, it will cause the POS machine and the smart terminal to fail to communicate normally. Cont...
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IPC IPC(8): H04L1/00
Inventor 贺彩文
Owner SHENZHEN YILIAN TECH