| 摘要 |
<p>An electromagnetic-noise protection circuit for protecting an electrical device, which processes wanted signals, comprises sensing means 11, 12 for sensing the presence of ambient electromagnetic noise from which the electrical device is to be protected, and filtering means 2 coupled to the sensing means 11, 12 and intermitting the operation of the electrical device in time periods during which the sensing means 11, 12 senses the presence of the ambient electromagnetic noise. The sensing means 11, 12 can include discriminating means 11 for discriminating wanted signals affected by ambient electromagnetic noise from wanted signals not affected by ambient electromagnetic noise wherein the discriminating means 11 can be implemented as a window comparator 11 comprising at least three trigger means and a logical gate means and producing a logic output signal indicating if the input signal is either below a certain lower threshold or beyond a certain upper threshold. <IMAGE></p> |
