Enhancement of musical signals degraded by background noise, using long-term behavior of the short-term spectral components

  • Authors:

  • Olivier Cappé

  • Affiliations:

  • TELECOM Paris, Département Signal, France

  • Venue:
  • ICASSP'93 Proceedings of the 1993 IEEE international conference on Acoustics, speech, and signal processing: plenary, special, audio, underwater acoustics, VLSI, neural networks - Volume I
  • Year:
  • 1993

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Abstract

The issue addressed in this paper is the restoration of musical recordings degraded by background noise. We present here a new technique based on the observation that the mere knowledge of the short-time spectrum of the noisy signal is not sufficient in order to enhance correctly the unknown musical signal. A procedure that enables the detection of sinusoidal signal components that are too low to be detected on the short-time power spectrum is proposed. When a component is detected, the performances of the enhancement system can be improved by using a longer observation-time to estimate the corresponding frequency bin. This method makes it possible to estimate sound partials that would otherwise get distorted by the restoration process.