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A Noise-Reduction System: Dynamic Spectral Filtering
A new method of audio noise reduction based on the -spectral derivative- instead of the usual -energy in a band- is proposed. The algorithm has been realized in a system utilizing dynamic filters to sense the upper corner of the audio spectrum and adjust the system to pass frequencies up to the corner. With the proper dynamics, the filter can pass the full bandwidth of the signal, suppress wide-band noise, and reduce the apparent noise with little perceived effect.
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