(again) on the Whittle likelihood. Biology Animals living in relatively static environments would have relatively fixed features of the environment to perceive. This allows the evolution of filters that match the expected signal with the highest signal-to-noise ratio, the matched filter. Sensors that perceive the world "through such a 'matched filter' severely limits the amount of information the brain can pick up from the outside world, but it frees the brain from the need to perform more intricate computations to extract the information finally needed for fulfilling a particular task." See also Periodogram Filtered backprojection (Radon transform) Digital filter Statistical signal processing Whittle likelihood Profile likelihood Detection theory Multiple comparisons problem Channel capacity Noisy-channel coding theorem Spectral density estimation Least mean squares (LMS) filter Wiener filter MUltiple SIgnal Classification (MUSIC), a popular parametric superresolution method SAMV Notes References Further reading Statistical signal processing Signal estimation Telecommunication theory Gravitational-wave astronomy