| 摘要 |
<p>An active headset system is provided with either two stereo jack plugs or a six pin connector (T1, T2, T3, T4, T5, T6) to provide compatibility with existing socket configurations for personal stereo equipment and headsets (28, 30) on aircraft. The number of connections between the active headset and the remote noise cancellation circuitry is reduced from eight to six through the use of a common contact, having a controlled impedance, that serves as an input connection to corresponding terminals of the two earphones of the active headset. According to another aspect of the present invention, the transients associated with plugging in or unplugging stereo jack plugs or up to a seven pin connector into an active headset may be overcome by a transient detector in the noise cancellation circuitry. Yet another aspect of the present invention concerns the powering of the noise cancellation circuitry whether the noise cancellation circuitry is placed inside the active headset or at least partially internal to a remote external device.</p> |
