Quiet zone control system

摘要

An active noise control system generates an anti-noise signal to drive a speaker to produce sound waves to destructively interfere with an undesired sound in a quiet zone. The anti-noise signal is generated with an adaptive filter having filter coefficients. The coefficients of the adaptive filter may be adjusted based on a first filter adjustment from a first listening region, and a second filter adjustment from a second listening region. A first weighting factor may be applied to the first filter adjustment, and a second weighting factor may be applied to the second filter adjustment. The first and second weighting factors may dictate the location and size of the quiet zone as being outside or partially within at least one of the first listening region and the second listening region.

主权项

1. A non-transitory computer-readable medium comprising a plurality of instructions executable by a processor to create a quiet zone in a listening area, the non-transitory computer-readable medium comprising:
instructions to determine a first filter adjustment based on a first error signal indicative of an undesired sound in a first listening region included in the listening area; instructions to determine a second filter adjustment based on a second error signal indicative of the undesired sound in a second listening region included in the listening area; instructions to set and apply a first weighing factor to the first filter adjustment, and set and apply a second weighting factor to the second filter adjustment, the first and second weighting factors set to values selected from a plurality of non-zero incremental values; and instructions to update a set of filter coefficients of an adaptive filter based on the first weighted filter adjustment and the second weighted filter adjustment, the adaptive filter configured to generate an anti-noise signal to destructively interfere with the undesired sound to create the quiet zone.