Float - Revision history

Raffriff42: Float audio range notes

2019-10-28T20:25:58Z

Float audio range notes

← Older revision		Revision as of 22:25, 28 October 2019
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	'''Float''' (or fully IEEE floating point with single precision) is one of the [[ConvertAudio\|AviSynth audio sample formats]].		'''Float''' (or fully IEEE floating point with single precision) is one of the [[ConvertAudio\|AviSynth audio sample formats]].

	The samples of this type have values between -1.~~00000~~ (= 0xBF800000) and 1.~~000000~~ (= 0x3F800000).		The samples of this type have normal values between -1.0 (= 0xBF800000) and +1.0 (= 0x3F800000). Values outside this range are usable as long as the audio remains in Float format, but will create audio clipping if [[ConvertAudio\|converted]] to an integer format: 8, 16, 24 or 32 integer bits. For safety, you can call [[Normalize]] before converting from Float to Integer.

			ColorBarsHD ## audio format = Float; range -1.0 - +1.0
			Amplify(1000.0) ## range -1000.0 - +1000.0
			Amplify(0.001) ## range -1.0 - +1.0
			## output: unchanged

			ColorBarsHD ## audio format = Float; range -1.0 - +1.0
			Amplify(1000.0) ## range -1000.0 - +1000.0
			ConvertAudioTo16bit ## convert to Integer; severe clipping
			Amplify(0.001) ## still clipping


	The value of such a IEEE-754 number is computed as: sign * 2^exponent * 1.mantissa, using the following scheme:		The value of such a IEEE-754 number is computed as: sign * 2^exponent * 1.mantissa, using the following scheme:

Raffriff42: expanded disambiguation

2017-04-28T03:36:48Z

expanded disambiguation

← Older revision		Revision as of 05:36, 28 April 2017
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	''This page is about the ''Float ''audio format''. ''For the variable type, see [[Script_variables]]''. ''For the'' <code>Float()</code> ''function, go to [[Internal_functions#Float]]''		''This page is about the ''Float ''audio format.'' <br>
			:''For the variable type, see [[Script_variables]].'' <br>
			:''For the'' <code>Float()</code> ''function, go to [[Internal_functions#Float]].'' <br>
			:''For the {{Deep_color}} format, go to [[Float_(color_format)]]''

Admin at 15:58, 3 April 2016

2016-04-03T15:58:22Z

← Older revision		Revision as of 17:58, 3 April 2016
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	Sign bit is negative, exponent = 0, 1.mantissa = 1, so the number is -1.0		Sign bit is negative, exponent = 0, 1.mantissa = 1, so the number is -1.0

			and

			0x800000 = 01001011000000000000000000000000

			Sign Bit Exp 1.Mantissa
			0 10010110 00000000000000000000000

			150 - 127 = 23 1.0 bitshift 23 places

			Sign bit is positive, exponent = 23, 1.mantissa = 1, so the number is 8388608

	source: [https://web.archive.org/web/20120728135435/http://www.opferman.net/Text/ieee.txt opferman.net]		source: [https://web.archive.org/web/20120728135435/http://www.opferman.net/Text/ieee.txt opferman.net]

	[[Category:Glossary]]		[[Category:Glossary]]

Admin at 15:50, 3 April 2016

2016-04-03T15:50:44Z

← Older revision		Revision as of 17:50, 3 April 2016
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	* The sign bit is 1 (negative) or 0 (positive).		* The sign bit is 1 (negative) or 0 (positive).
	* The exponent runs from -127 (00000000) to 0 (0111111) to 128 (11111111).		* The exponent runs from -127 (00000000) to 0 (0111111) to 128 (11111111).
	* The mantissa m1m2m3 ... means m1/2 + m2/4 + m3/8 + ... in decimal. Sometimes people denote "1.m1m2m3..." as the mantissa (like is done in the converter ~~above~~).		* The mantissa m1m2m3 ... means m1/2 + m2/4 + m3/8 + ... in decimal. Sometimes people denote "1.m1m2m3..." as the mantissa (like is done in the converter below).

	For an on-line converter between decimal numbers and IEEE 754 floating point, see [http://www.h-schmidt.net/FloatConverter/IEEE754.html here].		For an on-line converter between decimal numbers and IEEE 754 floating point, see [http://www.h-schmidt.net/FloatConverter/IEEE754.html here].

Admin: link did not exist anymore

2016-01-01T16:05:31Z

link did not exist anymore

← Older revision		Revision as of 18:05, 1 January 2016
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	Sign bit is negative, exponent = 0, 1.mantissa = 1, so the number is -1.0		Sign bit is negative, exponent = 0, 1.mantissa = 1, so the number is -1.0

	source: [http://www.opferman.net/Text/ieee.txt opferman.net]		source: [https://web.archive.org/web/20120728135435/http://www.opferman.net/Text/ieee.txt opferman.net]

	[[Category:Glossary]]		[[Category:Glossary]]

Raffriff42: link to alternate uses of Float; formatting

2014-09-17T16:29:36Z

link to alternate uses of Float; formatting

← Older revision		Revision as of 18:29, 17 September 2014
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	Float (or fully IEEE floating point with single precision) is one of the ~~sample types of~~ AviSynth's audio~~. For a converter see [http://www.h-schmidt.net/FloatConverter/IEEE754.html here~~].		''This page is about the ''Float ''audio format''. ''For the variable type, see [[Script_variables]]''. ''For the'' <code>Float()</code> ''function, go to [[Internal_functions#Float]]''


			'''Float''' (or fully IEEE floating point with single precision) is one of the [[ConvertAudio\|AviSynth audio sample formats]].

	The samples of this type have values between -1.00000 (= 0xBF800000) and 1.000000 (= 0x3F800000).		The samples of this type have values between -1.00000 (= 0xBF800000) and 1.000000 (= 0x3F800000).
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	The value of such a IEEE-754 number is computed as: sign * 2^exponent * 1.mantissa, using the following scheme:		The value of such a IEEE-754 number is computed as: sign * 2^exponent * 1.mantissa, using the following scheme:

	[ 1 Sign Bit \| 8 Bit Exponent \| 23 Bit Mantissa ]		<code>[ 1 Sign Bit \| 8 Bit Exponent \| 23 Bit Mantissa ]</code>

	* The sign bit is 1 (negative) or 0 (positive).		* The sign bit is 1 (negative) or 0 (positive).
	* The exponent runs from -127 (00000000) to 0 (0111111) to 128 (11111111).		* The exponent runs from -127 (00000000) to 0 (0111111) to 128 (11111111).
	* The mantissa m1m2m3 ... means m1/2 + m2/4 + m3/8 + ... in decimal. Sometimes people denote "1.m1m2m3..." as the mantissa (like is done in the converter above).		* The mantissa m1m2m3 ... means m1/2 + m2/4 + m3/8 + ... in decimal. Sometimes people denote "1.m1m2m3..." as the mantissa (like is done in the converter above).

			For an on-line converter between decimal numbers and IEEE 754 floating point, see [http://www.h-schmidt.net/FloatConverter/IEEE754.html here].

	Examples:		Examples:
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	Sign bit is negative, exponent = 0, 1.mantissa = 1, so the number is -1.0		Sign bit is negative, exponent = 0, 1.mantissa = 1, so the number is -1.0

	source: [http://www.opferman.net/Text/ieee.txt]		source: [http://www.opferman.net/Text/ieee.txt opferman.net]

	[[Category:Glossary]]		[[Category:Glossary]]

Admin: typo

2014-07-05T19:36:40Z

typo

← Older revision		Revision as of 21:36, 5 July 2014
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	Float (or fully IEEE floating point with single precision) is one of the ~~samples~~ types of AviSynth's audio. For a converter see [http://www.h-schmidt.net/FloatConverter/IEEE754.html here].		Float (or fully IEEE floating point with single precision) is one of the sample types of AviSynth's audio. For a converter see [http://www.h-schmidt.net/FloatConverter/IEEE754.html here].

	The samples of this type have values between -1.00000 (= 0xBF800000) and 1.000000 (= 0x3F800000).		The samples of this type have values between -1.00000 (= 0xBF800000) and 1.000000 (= 0x3F800000).

Admin at 22:46, 23 June 2014

2014-06-23T22:46:37Z

← Older revision		Revision as of 00:46, 24 June 2014
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	and		and

	0xBF800000 = 10111111100000000000000000000000		0xBF800000 = 10111111100000000000000000000000

	Sign Bit Exp 1.Mantissa		Sign Bit Exp 1.Mantissa

Admin at 22:46, 23 June 2014

2014-06-23T22:46:15Z

← Older revision		Revision as of 00:46, 24 June 2014
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	Examples:		Examples:

	0x3F800000 = 00111111100000000000000000000000 (binary, see [http://easycalculation.]com/hex-converter.php]		0x3F800000 = 00111111100000000000000000000000 (binary, see [http://easycalculation.com/hex-converter.php])

	Sign Bit Exp 1.Mantissa		Sign Bit Exp 1.Mantissa

Admin at 22:45, 23 June 2014

2014-06-23T22:45:44Z

← Older revision		Revision as of 00:45, 24 June 2014
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	Examples:		Examples:

	0x3F800000 = 00111111100000000000000000000000 (binary, see [http://easycalculation.]com/hex-converter.php)		0x3F800000 = 00111111100000000000000000000000 (binary, see [http://easycalculation.]com/hex-converter.php]

	Sign Bit Exp 1.Mantissa		Sign Bit Exp 1.Mantissa