A method of masking tonal noise from a wind turbine. A background masking noise level is obtained, which is indicative of a level of background masking noise which partially masks the tonal noise. An additional masking noise level is calculated on the basis of the background masking noise level and a target total masking noise level. Additional masking noise is generated which further masks the tonal noise. A level of the additional masking noise is based on the calculated additional masking noise level. The level of the additional masking noise target is controlled in accordance with a predefined total masking noise level, and as a result the total masking noise level may be prevented from becoming undesirably high.
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