An analysis of digital dynamic range compression algorithms is presented. They are studied by employing a single-band feed-forward compressor model allowing the use of independent attack and release times for both RMS detection and gain smoothing. Artificial test signals for measuring the static and dynamic compressor characteristics are discussed. The parameters of the compressor model are estimated by fitting the model output to the output of the compressor under test by using a simplex method. The results are verified by comparing the output levels of the actual and the fitted compressor for real world audio samples.
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