Voice frequency signal frequency-selecting electricity-taking device and method
An audio signal and frequency selection technology, applied in the field of data security, can solve problems such as inconvenient authentication, and achieve the effect of eliminating the trouble of charging
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[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0019] figure 1 It is the schematic diagram of the existing audio USB shield. The audio U-shield is composed of a U-shield circuit, a battery, and an earphone plug. The battery is responsible for supplying power to the U-shield circuit. The data signal receiving end RX of the U-shield circuit is connected to the left channel L of the earphone plug, or to the right channel R of the earphone plug. The data signal sending end TX of the U-shield circuit is connected to the MIC microphone of the headphone plug, and the GND ground of the headphone plug is connected to the GND of the U-shield circuit. The authentication process is as follows: the U-shield software is installed in the smart terminal, and the U-shield software performs data exchange through the audio interface and the TX and RX ends of the U-shield circuit to achieve security authentication. T...
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