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doc/filters/equalizer: add examples for equalizer 

Add two examples on the usage of the equalizer filter.
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Werner Robitza 2014-01-02 20:17:56 +01:00 committed by Stefano Sabatini
parent 2574d62d0d
commit 53df11eb73
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doc/filters.texi
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@ -1395,6 +1395,21 @@ Set the required gain or attenuation in dB.
Beware of clipping when using a positive gain.
@end table
@subsection Examples
@itemize
@item
Attenuate 10 dB at 1000 Hz, with a bandwidth of 200 Hz:
@example
equalizer=f=1000:width_type=h:width=200:g=-10
@end example
@item
Apply 2 dB gain at 1000 Hz with Q 1 and attenuate 5 dB at 100 Hz with Q 2:
@example
equalizer=f=1000:width_type=q:width=1:g=2,equalizer=f=100:width_type=q:width=2:g=-5
@end example
@end itemize
@section highpass
Apply a high-pass filter with 3dB point frequency.