| 摘要 |
<p>Battery feed circuit, arranged for a pair of subscriber lines (A, B), including a voltage drive circuit (4, 5) including an operational amplifier (40, 50) having a predetermined output impedance determined by an alternating current terminal impedance for the pair of subscriber lines (A, B), voice signals and induced noise signals being terminated by the voltage drive circuit (4, 5).</p> |
