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Here I have tried to use Audacity noise-reduction on some radio speech.
ORiginal was recorded from the Twente university online radio tunner
http://websdr.ewi.utwente.nl:8901/
PRocessed with noise-reduction in Audacity.
Type
Wave (.wav)
Duration
0:36.355
File size
505.6 KB
Sample rate
7119.0 Hz
Bit depth
16 bit
Channels
Mono