| 摘要 |
<p>PURPOSE:To transmit data from a transmission/reception equipment like a contactless IC card to another transmission/reception equipment with a low power consumption by turning on/off an electronic switch in accordance with digital data to change the impedance of a magnetic coupling circuit. CONSTITUTION:At the time of data transmission from a first transmission/ reception equipment 1 to a second transmission/reception equipment 2, the output signal of a signal generating circuit 9 is interrupted in accordance with digital data to obtain a burst signal, and it is sent to the second transmission/reception equipment 2 through a magnetic coupling circuit 9. At the time of data transmission from the second transmission/reception equipment 2 to the first transmission/reception equipment 1, an electronic switch 19 in the second transmission/ reception equipment 2 is turned on and off in accordance with digital signal to change the impedance of the magnetic coupling circuit 9, and the output signal of a signal generating circuit 8 is obtained as the frequency modulated signal whose carrier frequency is changed in accordance with digital data. Thus, digital data in the second transmission/reception equipment 2 is obtained.</p> |
