US Patent 9848222 Methods and apparatus to detect spillover

Methods and apparatus to improve the accuracy of crediting media exposure through detecting reverberation indicative of spillover. Example disclosed methods involve determining periods of loudness in media presented by a media presentation device, and identifying a quantity of the periods of loudness that satisfy a duration threshold. Disclosed example methods also involve calculating a ratio by dividing the quantity of the periods of loudness that satisfy the duration threshold by a total number of periods of loudness in the media. Disclosed example methods also involve marking the media as usable to credit a media exposure if the ratio satisfies a loud threshold.