Filtering heavily polluted audio signals with low-cut, high-cut or notch filters helps only if the spectrum of disturbancesdoes not overlap the desired signal. Unfortunately, this is rarely the case in real situations. Therefore using frequencydomainmethods is the only way to achieve dramatic improvements when cleaning up noisy signals. Spectral denoisingworks well in the case of broadband, smoothly changing noise, however, the situation become hopeless when the noisecharacter changes abruptly and the S/N ratio is around zero decibels. We present a unique tool, reNOVAtor, working in3D domain (time, frequency, amplitude) allowing efficient removal of tenacious disturbances. An intuitive manmachineinterface allows localization, identification, and very precise removal of unwanted audio events. Specialfunctions like automatic detection of clicks, tones, and harmonics significantly accelerate the workflow. A specialdifference function allows monitoring of the signal portion being removed.
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