From 242c07982ad523b2e0f928a204a6f2d293a956d7 Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Thu, 17 Mar 2022 10:18:08 +0100
Subject: doc/filters: add some afftdn examples

---
 doc/filters.texi | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'doc')

diff --git a/doc/filters.texi b/doc/filters.texi
index f25c5c1640..d70ac3e237 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -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.
 
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