| 摘要 |
<p>An active acoustic attenuation system attenuates a correlated input acoustic wave and eliminates the need for an input transducer sensing such wave. An output transducer (14) introduces a canceling acoustic wave to attenuate the input acoustic wave and yield an attenuated output acoustic wave. An error transducer (16) senses the output acoustic wave and provides an error signal (44). An adaptive filter model (M) has a model input (202), a model output (204) outputting a correction signal (46) to the output transducer (14) to introduce the canceling acoustic wave, and an error input (206) from the error transducer (16). A summer (208) has a first input (210) from the model output (204), a second input (212) from the error transducer (16), and an output (214) outputting a resultant sum to the model input (202), such that the model input (202) is provided by the sum of the correction signal (46) and the error signal (44). <IMAGE></p> |
