Initial algebra - Revision history

en>Tayloj: math typesetting

2014-07-29T21:34:40Z

math typesetting

← Older revision		Revision as of 23:34, 29 July 2014
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	~~The '''zero-crossing rate''~~' is the ~~rate~~ of ~~sign-changes along a [[signal (information theory)\|signal]], i~~.e.~~, the rate at which the signal changes from positive to negative or back~~.<~~ref~~>* Chen, C. H., Signal processing handbook, Dekker, New York, 1988<~~/ref~~> ~~This feature has been used heavily in both [[speech recognition]] and [[music information retrieval]], being a key feature to classify percussive sounds.<ref>Gouyon F., Pachet F., Delerue O. (2000)~~,[http://~~www~~.~~csl.sony.fr/downloads/papers~~/~~2000/gouyon-dafx2000~~.~~pdf Classifying percussive sounds: a matter of zero-crossing rate~~?~~], in Proceedings of the COST G-6 Conference on Digital Audio Effects (DAFX-00), Verona, Italy, December 7–9, 2000. Accessed 26th April 2011.</ref>~~		Ed is what individuals call me and my wife doesn't like it at all. To play lacross is the thing I adore most of all. I've always loved residing in Alaska. Credit authorising is how she makes a residing.<br><br>Here is my webpage: spirit messages, [http://clothingcarearchworth.com/index.php?document_srl=441551&mid=customer_review Discover More Here],

	~~ZCR is defined formally as~~

	~~:<math>zcr~~ = ~~\frac{1}{T-1} \sum_{t~~=~~1}^{T-1} {{\mathbb I}\left\{{s_t s_{t-1} < 0}\right\}}</math>~~

	~~where <math>s</math> is a signal of length <math>T</math> and the indicator function <math>{{\mathbb I}\left\{{A}\right\}}</math> is 1 if its argument <math>A</math> is true and 0 otherwise.~~

	In some cases only the "positive-going" or "negative-going" crossings are counted, rather than all the crossings - since, logically, between a pair of adjacent positive zero-crossings there must be one and only one negative zero-crossing.

	~~For [[Monaural\|monophonic]] tonal signals, the zero-crossing rate can be used as a primitive [[pitch detection algorithm~~]].

	~~==Applications==~~
	~~Zero crossing rates are used for [[Voice activity detection]](VAD), i.e.~~, ~~finding whether a segment of speech is voiced or unvoiced.~~

	~~==See also==~~
	* [[Zero crossing]]
	* [[Digital signal processing]]

	~~==References==~~
	~~<references />~~

	~~[[Category:Signal processing]]~~


	~~{{Signal-processing-stub}}~~

en>Steel1943: Disambiguated: programming → Mathematical programming

2013-04-07T03:44:33Z

Disambiguated: programming → Mathematical programming

← Older revision		Revision as of 05:44, 7 April 2013
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	~~I would like to introduce myself to you, I am Andrew and my wife doesn~~'~~t like it at all. To perform lacross~~ is the ~~factor I love most~~ of ~~all~~. ~~North Carolina is~~ the ~~place he loves most but now he is contemplating other choices. Credit authorising is how she tends~~ to ~~make a living~~.<br><br>~~My web site: psychic readings online~~ ([http://~~medialab~~.~~zendesk~~.~~com~~/~~entries~~/~~54181460~~-~~Will~~-~~You~~-~~Often~~-~~End~~-Up-~~Bored~~-~~Try~~-~~One~~-Of-~~These~~-~~Hobby~~-~~Ideas~~- ~~read more~~])		The '''zero-crossing rate''' is the rate of sign-changes along a [[signal (information theory)\|signal]], i.e., the rate at which the signal changes from positive to negative or back.<ref>* Chen, C. H., Signal processing handbook, Dekker, New York, 1988</ref> This feature has been used heavily in both [[speech recognition]] and [[music information retrieval]], being a key feature to classify percussive sounds.<ref>Gouyon F., Pachet F., Delerue O. (2000),[http://www.csl.sony.fr/downloads/papers/2000/gouyon-dafx2000.pdf Classifying percussive sounds: a matter of zero-crossing rate?], in Proceedings of the COST G-6 Conference on Digital Audio Effects (DAFX-00), Verona, Italy, December 7–9, 2000. Accessed 26th April 2011.</ref>

			ZCR is defined formally as

			:<math>zcr = \frac{1}{T-1} \sum_{t=1}^{T-1} {{\mathbb I}\left\{{s_t s_{t-1} < 0}\right\}}</math>

			where <math>s</math> is a signal of length <math>T</math> and the indicator function <math>{{\mathbb I}\left\{{A}\right\}}</math> is 1 if its argument <math>A</math> is true and 0 otherwise.

			In some cases only the "positive-going" or "negative-going" crossings are counted, rather than all the crossings - since, logically, between a pair of adjacent positive zero-crossings there must be one and only one negative zero-crossing.

			For [[Monaural\|monophonic]] tonal signals, the zero-crossing rate can be used as a primitive [[pitch detection algorithm]].

			==Applications==
			Zero crossing rates are used for [[Voice activity detection]](VAD), i.e., finding whether a segment of speech is voiced or unvoiced.

			==See also==
			* [[Zero crossing]]
			* [[Digital signal processing]]

			==References==
			<references />

			[[Category:Signal processing]]


			{{Signal-processing-stub}}

en>CXCV: +ja

2012-04-30T21:46:24Z

+ja

New page

I would like to introduce myself to you, I am Andrew and my wife doesn't like it at all. To perform lacross is the factor I love most of all. North Carolina is the place he loves most but now he is contemplating other choices. Credit authorising is how she tends to make a living.<br><br>My web site: psychic readings online ([http://medialab.zendesk.com/entries/54181460-Will-You-Often-End-Up-Bored-Try-One-Of-These-Hobby-Ideas- read more])