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Real-Time Broadband Noise Reduction

Robert Hoeldrich and Markus Lorber
A real-time implementation of a broadband noise reduction method based on non-linear spectral subtraction is proposed. To prevent processing distortions in form of musical noise, over-subtraction is applied to the degraded signal spectrum. Furthermore, time-averaging is used to reduce the variance of the estimated signal-to-noise ratio (SNR). A masking threshold obtained by spectral smoothing leads to further reduction of audible processing distortions.

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