| 摘要 |
<p>An identification system employs a passive activator (320) to transmit an identification code. From a low frequency electromagnetic field, the passive activator (320) derives AC voltage and converts it to DC pulses. The DC pulses energize the activator (320) in order to transmit the identification code within one of the DC pulses. A controller (100), upon receiving an authorized code, generates an output for activating a device.</p> |
