a) A method of changing the distribution of the noise that is due to truncation by premultiplying values. b) In a sound level meter, this is a filter that creates a response that corresponds to the ear’s varying sensitivity at different loudness levels. A weighting corresponds to the sensitivity of the ear at lower listening levels. The filter design weights or is more sensitive in certain frequency bands than others. The goal is to obtain measurements that correlate well with the subjective perception of noise.