Editing Amplify

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These filters amplify the audio of the clip by the prescribed amount. You can specify different {{FuncArg|amount}} arguments for each channel. If there are more arguments than there are channels, the extra ones are ignored. If there are fewer arguments than channels, the last one is applied to the rest of the channels. 

8bit and 24bit audio is converted to [[Float|float]]; the other audio formats are kept as they are. See [[ConvertAudio]].


{{FuncDefH4|Amplify}}
{{FuncDef|Amplify(clip, float ''amount'' [, float ''amount'' ]...)}}

:{{Par2|amount|float|1.0}}
::Multiply (scale) the audio by {{FuncArg|amount}}; values are linear :
::*{{FuncArg|amount}} > 1.0 increases volume
::*{{FuncArg|amount}} < 1.0 decreases volume
::*{{FuncArg|amount}} = 1.0 retains the same volume (default)
::*Negative scale factors will shift the [http://www.soundonsound.com/sos/apr08/articles/phasedemystified.htm phase] by 180 degrees (i.e. invert the samples) 


{{FuncDefH4|AmplifyDB}}
{{FuncDef|AmplifyDB(clip, float ''amount'' [, float ''amount'' ]...)}}

:{{Par2|amount|float|0.0}}
::Multiply (scale) the audio by {{FuncArg|amount}}; values are in dB ([[wikipedia:Decibel|decibels]]) :
::*{{FuncArg|amount}} > 0.0 increases volume
::*{{FuncArg|amount}} < 0.0 decreases volume
::*{{FuncArg|amount}} = 0.0 retains the same volume (default)


The relation between ''linear'' and ''decibel'' gain control is:
::'''lin''' = 10<sup> ('''dB'''/20)</sup> 
::'''dB''' = 20'''·'''log<sub>10</sub>('''lin''')
For example,
:*<tt>AmplifyDB(&nbsp;  0.0)</tt> ''is equivalent to''&nbsp; <tt>Amplify(1.0)&nbsp;</tt> (no change)
:*<tt>AmplifyDB(&nbsp; 6.0)</tt> ''is equivalent to''&nbsp; <tt>Amplify(2.0)&nbsp;</tt> (about twice as loud)
:*<tt>AmplifyDB( -6.0)</tt> ''is equivalent to''&nbsp; <tt>Amplify(0.5)&nbsp;</tt> (about half as loud)
:*<tt>AmplifyDB( 20.0)</tt> ''is equivalent to''&nbsp; <tt>Amplify(10)&nbsp;&nbsp;</tt> (much louder)
:*<tt>AmplifyDB(-20.0)</tt> ''is equivalent to''&nbsp; <tt>Amplify(0.1)&nbsp;</tt> (much softer)


More examples:
:*<tt>AmplifyDB(+3, 0)</tt> increases the volume of the left channel by a small amount.
:*<tt>Amplify(-1, 1)</tt> inverts the phase of the left channel. See Wikipedia: [[Wikipedia:Out_Of_Phase_Stereo|Out Of Phase Stereo]].

==== See Also ====
* [[Normalize]] - with ''show=true'', can show the maximum amplification possible without [[Wikipedia:Clipping_%28audio%29|clipping]].

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[[Category:Internal filters]]
[[Category:Audio_filters]]
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 These filters amplify the audio of the clip by the prescribed amount. You can specify different {{FuncArg|amount}} arguments for each channel. If there are more arguments than there are channels, the extra ones are ignored. If there are fewer arguments than channels, the last one is applied to the rest of the channels.