Programmer Guide/Command Reference/EVAL/zcross - Revision history

Christian at 18:01, 21 April 2011

2011-04-21T18:01:18Z

← Older revision		Revision as of 20:01, 21 April 2011
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	:<code>zcross(<var>x</var> {<var>type</var> {, <var>sr</var> {, <var>xth</var>}}})</code>		:<code>zcross(<var>x</var> {<var>type</var> {, <var>sr</var> {, <var>xth</var>}}})</code>
	:;<var>x</var>:data vector (signal)		:;<var>x</var>:data vector (signal)
	:;<var>type</var>:selects the type of result; 0 <= ''type'' <= 3 (default=0)		:;<var>type</var>:selects the type of result; 0 ≤ ''type'' ≤ 3 (default=0)
	:;<var>sr</var>: sampling rate in Hz (default=1)		:;<var>sr</var>: sampling rate in Hz (default=1)
	:;<var>xth</var>: threshold value (default=0); if ''xth'' is a value greater than 0, fluctuations of the function in the range ''-xth'' < ''x''[i] < ''xth'' are ignored		:;<var>xth</var>: threshold value (default=0); if ''xth'' is a value greater than 0, fluctuations of the function in the range ''-xth'' < ''x''[i] < ''xth'' are ignored

193.171.195.48 at 11:23, 21 April 2011

2011-04-21T11:23:44Z

← Older revision		Revision as of 13:23, 21 April 2011
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	{{DISPLAYTITLE:{{SUBPAGENAME}}}}		{{DISPLAYTITLE:{{SUBPAGENAME}}}}
	Compute zero crossing density.		Compute zero crossing density.

	;Usage:		;Usage:
	:<code>~~qinterp~~(<var>x</var> {<var>type</var> {, <var>sr</var> {, <var>xth</var>}}})</code>		:<code>zcross(<var>x</var> {<var>type</var> {, <var>sr</var> {, <var>xth</var>}}})</code>
	:;<var>x</var>:data vector (signal)		:;<var>x</var>:data vector (signal)
	:;<var>type</var>:selects the type of result; 0 <= ''type'' <= 3 (default=0)		:;<var>type</var>:selects the type of result; 0 <= ''type'' <= 3 (default=0)
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	\|''t'' = 1 / ''f'' = 2 / ''d''		\|''t'' = 1 / ''f'' = 2 / ''d''
	\|}		\|}
			;See also: [[../f0ac\|f0ac]]

	~~;See also:~~ [[~~Programmer_Guide~~/~~Command_Reference/EVAL/f0ac\|f0ac]]~~		[[../#Functions\|<function list>]]

	~~[[Programmer_Guide/Command_Reference/EVAL~~#Functions\|<function list>]]

Toni at 10:06, 11 April 2011

2011-04-11T10:06:55Z

← Older revision		Revision as of 12:06, 11 April 2011
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	;Usage:		;Usage:
	:<code>qinterp(<var>x</var> {<var>type</var>, {, <var>sr</var>}})</code>		:<code>qinterp(<var>x</var> {<var>type</var> {, <var>sr</var> {, <var>xth</var>}}})</code>
	:;<var>x</var>:data vector (signal)		:;<var>x</var>:data vector (signal)
	:;<var>type</var>:selects the type of result; 0 <= ''type'' <= 3 (default=0)		:;<var>type</var>:selects the type of result; 0 <= ''type'' <= 3 (default=0)
	:;<var>sr</var>: sampling rate in Hz (default=1)		:;<var>sr</var>: sampling rate in Hz (default=1)
			:;<var>xth</var>: threshold value (default=0); if ''xth'' is a value greater than 0, fluctuations of the function in the range ''-xth'' < ''x''[i] < ''xth'' are ignored
	;Result: The function counts the number of zero crossings ''z'' of the function <code>''x''[i] = f(i)</code>. The returned result is a scalar depending on ''z'' and the argument ''type''.		;Result: The function counts the number of zero crossings ''z'' of the function <code>''x''[i] = f(i)</code>. The returned result is a scalar depending on ''z'' and the argument ''type''.
	:{\|class="einrahmen"		:{\|class="einrahmen"

Toni at 09:58, 11 April 2011

2011-04-11T09:58:11Z

← Older revision		Revision as of 11:58, 11 April 2011
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	:;<var>type</var>:selects the type of result; 0 <= ''type'' <= 3 (default=0)		:;<var>type</var>:selects the type of result; 0 <= ''type'' <= 3 (default=0)
	:;<var>sr</var>: sampling rate in Hz (default=1)		:;<var>sr</var>: sampling rate in Hz (default=1)
	;Result: The function counts the number of zero crossings ''nz'' of the function <code>''x''[i] = f(i)</code>. The returned result is a scalar depending on ''nz'' and the argument ''type''.		;Result: The function counts the number of zero crossings ''z'' of the function <code>''x''[i] = f(i)</code>. The returned result is a scalar depending on ''z'' and the argument ''type''.
	:{\|class="einrahmen"		:{\|class="einrahmen"
	!''type'' !! result		!''type'' !! description !! result
	\|-		\|-
	\|'''0''' \|\| the number of zero crossing ''nz''		\|'''0''' \|\| the number of zero crossing
			\|''z''
	\|-		\|-
	\|'''1''' \|\| the zero crossing density ''dz'' = ''nz'' / ( '''ncol'''(''x'') * ''sr''~~)<BR>(number of zero crossings / second~~)		\|'''1''' \|\| the zero crossing density<BR>(number of zero crossings / second)
			\|''d'' = ''z'' / ('''ncol'''(''x'') * ''sr'')
	\|-		\|-
	\|'''2''' \|\| the average zero crossing frequenzy (in Hz) ''f'' = ''dz'' / 2		\|'''2''' \|\| the average zero crossing frequenzy (in Hz)
			\|''f'' = ''d'' / 2
	\|-		\|-
	\|'''3''' \|\| the average zero crossing periode length (in seconds) ''t'' = 2 / ''dz''		\|'''3''' \|\| the average zero crossing periode length (in seconds)
			\|''t'' = 1 / ''f'' = 2 / ''d''
	\|}		\|}

Toni at 09:55, 11 April 2011

2011-04-11T09:55:39Z

← Older revision		Revision as of 11:55, 11 April 2011
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	;Result: The function counts the number of zero crossings ''nz'' of the function <code>''x''[i] = f(i)</code>. The returned result is a scalar depending on ''nz'' and the argument ''type''.		;Result: The function counts the number of zero crossings ''nz'' of the function <code>''x''[i] = f(i)</code>. The returned result is a scalar depending on ''nz'' and the argument ''type''.
	:{\|class="einrahmen"		:{\|class="einrahmen"
	!''type'' !! ~~description~~		!''type'' !! result
	\|-		\|-
	\|'''0''' \|\| the number of zero crossing ''nz''		\|'''0''' \|\| the number of zero crossing ''nz''

Toni at 09:55, 11 April 2011

2011-04-11T09:55:23Z

← Older revision		Revision as of 11:55, 11 April 2011
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	:;<var>type</var>:selects the type of result; 0 <= ''type'' <= 3 (default=0)		:;<var>type</var>:selects the type of result; 0 <= ''type'' <= 3 (default=0)
	:;<var>sr</var>: sampling rate in Hz (default=1)		:;<var>sr</var>: sampling rate in Hz (default=1)
	;Result: The function counts the number of zero crossings ''nz'' of the function <code>''x[i]'' = f(i)</code>. The returned result is a scalar depending on ''nz'' and the argument ''type''.		;Result: The function counts the number of zero crossings ''nz'' of the function <code>''x''[i] = f(i)</code>. The returned result is a scalar depending on ''nz'' and the argument ''type''.
	:{\|class="einrahmen"		:{\|class="einrahmen"
	!''type'' !! description		!''type'' !! description

Toni at 09:55, 11 April 2011

2011-04-11T09:55:01Z

@@ Line 7: / Line 7: @@
 :;<var>type</var>:selects the type of result; 0 <= ''type'' <= 3 (default=0)
 :;<var>sr</var>: sampling rate in Hz (default=1)
-;Result: The function counts the number of zero crossings ''nz'' of the function ''x''[i]. The returned result is a scalar depending on ''nz'' and the argument ''type''.
+;Result: The function counts the number of zero crossings ''nz'' of the function <code>''x[i]'' = f(i)</code>. The returned result is a scalar depending on ''nz'' and the argument ''type''.
 :{|class="einrahmen"
 !''type'' !! description
@@ Line 21: / Line 20: @@
 |}
+;See also: [[Programmer_Guide/Command_Reference/EVAL/f0ac|f0ac]]
 [[Programmer_Guide/Command_Reference/EVAL#Functions|<function list>]]

Toni at 09:53, 11 April 2011

2011-04-11T09:53:10Z

← Older revision		Revision as of 11:53, 11 April 2011
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	{{DISPLAYTITLE:{{SUBPAGENAME}}}}		{{DISPLAYTITLE:{{SUBPAGENAME}}}}
			Compute zero crossing density.

			;Usage:
			:<code>qinterp(<var>x</var> {<var>type</var>, {, <var>sr</var>}})</code>
			:;<var>x</var>:data vector (signal)
			:;<var>type</var>:selects the type of result; 0 <= ''type'' <= 3 (default=0)
			:;<var>sr</var>: sampling rate in Hz (default=1)
			;Result: The function counts the number of zero crossings ''nz'' of the function ''x''[i]. The returned result is a scalar depending on ''nz'' and the argument ''type''.
			The scalar ''z'' with following meaning:
			:{\|class="einrahmen"
			!''type'' !! description
			\|-
			\|'''0''' \|\| the number of zero crossing ''nz''
			\|-
			\|'''1''' \|\| the zero crossing density ''dz'' = ''nz'' / ( '''ncol'''(''x'') * ''sr'')<BR>(number of zero crossings / second)
			\|-
			\|'''2''' \|\| the average zero crossing frequenzy (in Hz) ''f'' = ''dz'' / 2
			\|-
			\|'''3''' \|\| the average zero crossing periode length (in seconds) ''t'' = 2 / ''dz''
			\|}


			;See also: [[Programmer_Guide/Command_Reference/EVAL/ipeak\|ipeak]], [[Programmer_Guide/Command_Reference/EVAL/formants\|formants]]

			[[Programmer_Guide/Command_Reference/EVAL#Functions\|<function list>]]


	=====zcross=====		=====zcross=====

Admin: 1 revision: Initial import

2010-11-18T16:31:40Z

1 revision: Initial import

← Older revision	Revision as of 18:31, 18 November 2010
(No difference)

193.171.195.8: initial import

2010-05-17T13:05:27Z

initial import

New page

{{DISPLAYTITLE:{{SUBPAGENAME}}}}
=====zcross=====

=====Usage:=====

<code>zcross(<var>x</var> [, <var>type</var>=0 {0..3}, <var>xmin</var>=0, <var>srate</var>=1])</code>

=====Parameters:=====

;<var>type</var>

:The type of result to return (see Result)

;<var>xmin</var>

:The minimum x value.

;<var>srate</var>

:The sampling rate.

=====Result:=====

Returns a scalar:

If <var>type</var>=<code>0</code>, the number of zero-crossings.

If <var>type</var>=<code>1</code>, the density of zero-crossings (number of zero-crossings / seconds).

If <var>type</var>=<code>2</code>, the frequency of zero-crossing (density / 2).

If <var>type</var>=<code>3</code>, the period length (1 / frequency = 2 / density).

=====Description:=====

Count the number of zero-crossings in the vector <var>x</var>. This is a subcommand of the <code>[[Programmer Guide/Command Reference/EVAL/EVAL|EVAL]]</code> command.