| 摘要 |
<p>A noise trap circuit particularly suitable for use in an electro-acoustic system, operates to suppress low level signals or noise while allowing a relatively large signal to pass unattenuated between input (22) and output (24) terminals of the circuit. Blocking elements (D1, D2) between the input (22) and output (24) terminals establish a high impedance path to the noise but switch to a conductive state when the large signals are present at the input terminals. Shunt elements (M1, M2) across the output terminals (24) provide a low resistance path or "crowbar" when only the noise is present at the input terminals, but switch to a non-conductive state when the large signals are sensed at the circuit input.</p> |
