| 摘要 |
<p>At least one movable device is mechanically coupled to a coupling device which moves in response to the motion of the movable device. The coupling device moves in a path which closely parallels the path of a time-varying, propagating electric field. Upon interception of the electric field with the coupling device, a signal is transferred through the coupling device by capacitive coupling with the field to an input of a detector. The signal is detected by circuitry which generates a pulse width modulated (PWM) signal corresponding to the period of time between the initiation of the propagation of the electric field and the moment of interception. Circuitry is provided to generate pulse code modulated (PCM) signals responsive to the position location of up to 2n movable devices.</p> |
