| 摘要 |
<p>Filter circuit and a process for its use for a microphone (1), which is connected to a peripheral with variable frequency response. In order to achieve a sound independent of the electrical impedance of the downstream device, a filter section (11), which includes a signal converter (2), an active filter (5), a summing unit (6) and an amplifier/pole changer (7), is arranged on an audio transformer (3) with two pairs of coils (3a, 3b).</p> |
