| 摘要 |
A method for inductively transmitting digital data consists in receiving, from a computer system, data from a magnetic strip containing payment card data, processing the data received from the magnetic strip and generating high-power magnetic pulses containing the processed magnetic strip data. The magnetic pulses are transmitted by means of a digital data transmission device, and are then received using a reader head of a magnetic card reader device. The digital data transmission device is provided with an inductor. Data transmission is controlled using corresponding software which is installed in the computer system. The axis of the inductor and the axis of the reader head are positioned substantially in parallel and at a distance of up to 30 cm, providing for the polarization of the inductor signal. Normalized radiation power is regulated by using pulse width modulation and by changing the polarity, consisting in quickly switching the polarity of the power supply voltage applied to the inductor, while simultaneously amplifying the current therein, or without such amplification. |
