| 摘要 |
An active attenuation system has indirect error sensing. The invention operates in systems which attenuate an acoustic wave after the acoustic wave has propagated through and exited from a waveguide. Indirect error sensing is done by sensing the primary acoustic wave which is being attenuated while it is propagating through the waveguide, measuring a canceling acoustic wave while it is propagating in another waveguide, and by combining the measurements to generate an error signal corresponding to the error after the primary and canceling acoustic waves have combined in free space. Thus error measurements can be made without having exposed error sensors.
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