| 摘要 |
<p>The system controls a movable coil (1) placed in a magnetic field as in a loudspeaker onto the winding is fixed a magneto resistance (6) whose ohmic resistance is a function of the ambient magnetic field. The variations of the field enables one to obtain at the resistance terminals a voltage proportion to the coil displacement for control of undesired motion, caused for example by the coils inertia. After amplification (5) the voltage is shaped corrected and then injected into the coil circuit. At rest in the absence of the modulated AC signal, no current is injected. The magneto resistance (6) is connected to a corrector amplifier (7) this amplifier being connected to the terminals of a resistance (8) inserted in the movable winding circuit (4).</p> |
