Name
Noisered -- filter out noise from the audio
Synopsis
noisered [profile-file [amount]]
Function
Reduce noise in the audio signal by profiling and filtering. This effect is moderately effective at removing consistent background noise such as hiss or hum. To use it, first run the noiseprof effect on a section of audio that ideally would contain silence but in fact contains noise - such sections are typically found at the beginning or the end of a recording. noiseprof will write out a noise profile to profile-file, or to the standard output if no profile-file or if '-' is given.

To actually remove the noise, run the noisered effect; noisered will reduce noise according to a noise profile (which was generated by noiseprof), from profile-file.

How much noise should be removed is specified by amount - a number between 0 and 1 with a default of 0.5. Higher numbers will remove more noise but present a greater likelihood of removing wanted components of the audio signal. Before replacing an original recording with a noise-reduced version, experiment with different amount values to find the optimal one for your audio; use headphones to check that you are happy with the results, paying particular attention to quieter sections of the audio.

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