Amplify - Revision history

Reel.Deal: add link to avs+ documentation

2022-09-18T03:32:52Z

add link to avs+ documentation

Raffriff42: one more touch-up

2016-02-27T21:07:46Z

one more touch-up

Admin at 21:25, 16 January 2016

2016-01-16T21:25:32Z

Raffriff42: formatting, links, phrasing

2016-01-13T22:22:59Z

formatting, links, phrasing

Raffriff42: added category

2015-11-08T15:21:25Z

added category

Admin: please don't put stuff in comments; just ask or add a todo line if you are not sure about something

2015-09-06T21:39:35Z

please don't put stuff in comments; just ask or add a todo line if you are not sure about something

Raffriff42: clarify AmplifyDB w/ examples; clarify negative scale factor; delete obsolete "converted to 16 bits in the process"

2015-08-31T22:48:18Z

clarify AmplifyDB w/ examples; clarify negative scale factor; delete obsolete "converted to 16 bits in the process"

Admin: 1 revision

2013-05-09T15:02:24Z

1 revision

Wilbert at 19:29, 29 March 2006

2006-03-29T19:29:32Z

New page

{{Template:Func4Def|Amplify(clip, float ''amount1'' ''[, ...]'')|Amplify(clip, float ''left'', float ''right'')|AmplifydB(clip, float ''amount1'' ''[, ...]'')|AmplifydB(clip, float ''left'', float ''right'')}}

Amplify multiplies the audio samples by ''amount''. You can specify different factors for each channel.
If there are more volumes than there are channels, they are ignored. If there are fewer volumes than channels, the last volume is applied to the rest of the channels.

AmplifydB is the same except values are in decibels (dB). You can use negative dB values (or scale factors between 0 and 1) for reducing volume. Negative scale factors will shift the phase by 180 degrees (i.e. invert the samples).

Audio samples are converted to 16 bits in the process.

[[Category:Internal filters]]

← Older revision		Revision as of 03:32, 18 September 2022
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	<div style="max-width:62em" >		<div style="max-width:62em" >
		+
		+	<div {{BlueBox2\|40\|0\|3px solid purple}} >
		+	{{AvsPlusFullname}}<br>
		+	Up-to-date documentation: [https://avisynthplus.readthedocs.io/en/latest/avisynthdoc/corefilters/amplify.html https://avisynthplus.readthedocs.io]
		+	</div>
		+
		+
	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.		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.

@@ Line 1: / Line 1: @@
 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.
@@ Line 26: / Line 27: @@
 The relation between ''linear'' and ''decibel'' gain control is:
-::{{Serif|lin}} = {{Serif|10}}<sup> {{Serif|(dB / 20)}}</sup>
+::'''lin''' = 10<sup> ('''dB'''/20)</sup>
-::{{Serif|dB}} = {{Serif|20}} '''·''' {{Serif|log}}<sub>{{Serif|10}}</sub>{{Serif|(lin)}}
+::'''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;</tt> (much louder)
+:*<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)</tt> (much softer)
+:*<tt>AmplifyDB(-20.0)</tt> ''is equivalent to''&nbsp; <tt>Amplify(0.1)&nbsp;</tt> (much softer)
@@ Line 39: / Line 40: @@
 :*<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]].
 [[Category:Internal filters]]
 [[Category:Audio_filters]]

@@ Line 32: / Line 32: @@
 :*<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(100)&nbsp;</tt> (much louder)
+:*<tt>AmplifyDB( 20.0)</tt> ''is equivalent to''&nbsp; <tt>Amplify(10)&nbsp;</tt> (much louder)
-:*<tt>AmplifyDB(-20.0)</tt> ''is equivalent to''&nbsp; <tt>Amplify(0.01)</tt> (much softer)
+:*<tt>AmplifyDB(-20.0)</tt> ''is equivalent to''&nbsp; <tt>Amplify(0.1)</tt> (much softer)

@@ Line 1: / Line 1: @@
-{{Template:Func4Def|Amplify(clip, float ''amount1'' ''[, ...]'')|Amplify(clip, float ''left'', float ''right'')|AmplifydB(clip, float ''amount1'' ''[, ...]'')|AmplifydB(clip, float ''left'', float ''right'')}}
+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.
-These filters amplify the audio of the clip by the prescribed amount.
+bit and 24bit audio is converted to [[Float|float]]; the other audio formats are kept as they are. See [[ConvertAudio]].
-:*Negative scale factors will shift the phase by 180 degrees (i.e. invert the samples)
+{{FuncDefH4|Amplify}}
-'''AmplifyDB''' is the same, except values are in [[wikipedia:Decibel|decibels]] (dB). The relation between them is 'amount = 10^(decibels/20)'. You use negative dB values for reducing volume.
+:{{Par2|amount|float|1.0}}
-You can specify different factors for each channel. If there are more volumes than there are channels, the extra volume arguments are ignored. If there are fewer volumes than channels, the last volume is applied to the rest of the channels.
+{{FuncDefH4|AmplifyDB}}
-bit and 24bit Audio samples are converted to float in the process, the other audio formats are kept.
+:{{Par2|amount|float|0.0}}
 [[Category:Internal filters]]
 [[Category:Audio_filters]]

← Older revision		Revision as of 15:21, 8 November 2015
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	[[Category:Internal filters]]		[[Category:Internal filters]]
		+	[[Category:Audio_filters]]

@@ Line 1: / Line 1: @@
 {{Template:Func4Def|Amplify(clip, float ''amount1'' ''[, ...]'')|Amplify(clip, float ''left'', float ''right'')|AmplifydB(clip, float ''amount1'' ''[, ...]'')|AmplifydB(clip, float ''left'', float ''right'')}}
 '''Amplify''' multiplies the audio samples by ''amount''. You use scale factors between 0 and 1 for reducing volume.
@@ Line 6: / Line 7: @@
 :*Negative scale factors will shift the phase by 180 degrees (i.e. invert the samples)
-'''AmplifyDB''' is the same, except values are in [[wikipedia:Decibel|decibels]] (dB). You use negative dB values for reducing volume.
+:*<code>AmplifyDB( 6.0)</code> is equivalent to <code>Amplify(2.0)</code>
+:*<code>AmplifyDB( 0.0)</code> is equivalent to <code>Amplify(1.0)</code>
-:*<code>AmplifyDB( 6.0)</code> is equivalent to <code>Amplify(2.0)</code>
 :*<code>AmplifyDB(-6.0)</code> is equivalent to <code>Amplify(0.5)</code>
 You can specify different factors for each channel. If there are more volumes than there are channels, the extra volume arguments are ignored. If there are fewer volumes than channels, the last volume is applied to the rest of the channels.
-<!-- Audio samples are converted to 16 bits in the process. -->
+bit and 24bit Audio samples are converted to float in the process, the other audio formats are kept.
 [[Category:Internal filters]]