Title

Adaptive Scratch Noise Filtering

Title - Alternative

IEEE Trans. Consum. Electron.

Keywords

Engineering, Electrical & Electronic; Telecommunications

Abstract

An adaptive method for suppressing scratch (impulsive) noise from audio signals is proposed. The algorithm has been developed primarily for the restoration of old phonograph records, but it can also be used for other applications as well. Impulses are suppressed by selectively applying variable length median filtering to contaminated signal regions only, thus minimizing distortion of clean passages and loss of high musical frequencies. The median window length is adaptively adjusted depending on the number of samples in each contaminated signal region. For off-line processing, the algorithm is simple enough to be implemented on a personal computer equipped with an inexpensive sound board. Experiments with old recordings produced restored signals of dramatically improved sound quality. The restored audio signal can be played through the sound bo ard and stored onto an analog recording media such as high-quality cassette tapes.

Publication Title

Ieee Transactions on Consumer Electronics

Volume

39

Issue/Number

4

Publication Date

1-1-1993

Document Type

Article

Language

English

First Page

917

Last Page

922

WOS Identifier

WOS:A1993MM70900027

ISSN

0098-3063

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