| 摘要 |
<p>A balanced spectrum limiter (12) for limiting the frequency spectrum of signals transmitted through a telephone or communication system includes one or more filters (13, 34) and an energy surge protection circuit (2). Each filter includes a pair of inductors (22, 24, 38, 40) wound aroung a single core and a capacitor (26, 36) connected between the two inductors. The energy surge protection circuit (2) can be any type of energy surge protection circuit known in the art. The range of frequencies which can be transmitted is determined by the filter (13, 34). The filter circuit (13, 34, 64) is removably connected to the energy surge protection circuit so that filters of varying parameters may be easily interchanged. The circuits are contained in an openable housing arranged to be received by a connection block. Preferably, a cap (50) for the opening contains the balanced spectrum limiting subassembly (64) having one or more filters.</p> |
