Abstract: A parametric method for remodelling audio signals in frequency range by which an improvement of the signal-to-noise ratio is possible, in particular for historical recordings. The process builds on spectral analysis that makes it possible to manipulate frequencies, bandwidths, and amplitudes of isolated spectral components in any way. For remodelling, those components are selected that 1) are relevant for acoustic perception and 2) can be classified as tonal because of their temporal stability. By enhancing the tonal portions relative to the noisy components (tonal contrast enhancement), according to the invention, substantial improvements of the acoustic quality are obtained while preserving the natural acoustic impression. With the help of parallel computer architecture based on transputer and signal processors, remodelling is performed within a period that appears acceptable for studio work.