This sample of a Radio Australia broadcast on 6150 kHz demonstrates the Speex noise reduction built into DReaM 2.1+
The noise reduction is engaged and disengaged throughout playback. When the Speex noise reduction is removed, the noise level rises. Speex noise reduction in DReaM performs best on signals of average strength. Speex noise reduction doesn't have a large effect on strong or weak signals. This particular sample from Radio Australia is a strong signal, but the listener can still clearly hear the increased level of noise after the noise reduction is removed. This file is in AAC+ format.
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