Importance

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Abstract

A system and method are described in which additional signal processing is performed during in-the-field use of a personal listening device so that a control filter of a running acoustic noise cancellation process is selected based on the delta/difference between reference and residual error microphone signals of the device. This delta value represents the passive sound attenuation provided by the personal listening device. In other words, the control filter, which may be a programmable digital filter, is selected directly based on the delta between the level of external and error microphones. This delta value serves as an estimate of the current fit/leakage scenario, which enables the resulting anti-noise signal to better match a wide range of acoustic leaks (that may be caused by different earphone fits within the user's ear, or different ways a phone handset is held against the ear).

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First Claim