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doc/filters: add some afftdn examples

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Paul B Mahol 2022-03-17 10:18:08 +01:00
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doc/filters.texi
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@ -1396,6 +1396,30 @@ Default value is @code{none}.
This filter supports the some above mentioned options as @ref{commands}.
@subsection Examples
@itemize
@item
Reduce white noise by 10dB, and use previously measured noise floor of -40dB:
@example
afftdn=nr=10:nf=-40
@end example
@item
Reduce white noise by 10dB, also set initial noise floor to -80dB and enable automatic
tracking of noise floor so noise floor will gradually change during processing:
@example
afftdn=nr=10:nf=-80:tn=1
@end example
@item
Reduce noise by 20dB, using noise floor of -40dB and using commands to take noise profile
of first 0.4 seconds of input audio:
@example
asendcmd=0.0 afftdn sn start,asendcmd=0.4 afftdn sn stop,afftdn=nr=20:nf=-40
@end example
@end itemize
@section afftfilt
Apply arbitrary expressions to samples in frequency domain.