Programmer Guide/SPU Reference/WINDOW - Revision history

Jw at 06:39, 13 October 2015

2015-10-13T06:39:20Z

← Older revision		Revision as of 08:39, 13 October 2015
Line 91:		Line 91:
	\|Bartlett (triangle) window		\|Bartlett (triangle) window
	\|}		\|}
			;See also:
			<[[../#Signal Processing Atoms\|SP-atoms]]>

Jw at 06:38, 13 October 2015

2015-10-13T06:38:00Z

← Older revision		Revision as of 08:38, 13 October 2015
Line 32:		Line 32:
	! Description		! Description
	\|-		\|-
	\|~~<var>~~y~~</var>~~		\|y
	\|window function or windowed signal		\|window function or windowed signal
	\|-		\|-

Jw at 06:37, 13 October 2015

2015-10-13T06:37:43Z

← Older revision		Revision as of 08:37, 13 October 2015
Line 1:		Line 1:
	{{DISPLAYTITLE:{{SUBPAGENAME}}}}		{{DISPLAYTITLE:{{SUBPAGENAME}}}}
			{{SPAtomTemplate}}
	====WINDOW - signal window function====		====WINDOW - signal window function====

Line 9:		Line 10:

	{\|		{\|
			! style="text-align:leftr;"\|Name
			! Description
	\|-		\|-
	\|x		\|x
Line 26:		Line 29:

	{\|		{\|
			! style="text-align:leftr;"\|Name
			! Description
	\|-		\|-
	\|<var>y</var>		\|<var>y</var>

Toni: moved Programmer Guide/SPU Reference/WINDOW - signal window function to Programmer Guide/SPU Reference/WINDOW

2011-04-28T10:17:06Z

moved Programmer Guide/SPU Reference/WINDOW - signal window function to Programmer Guide/SPU Reference/WINDOW

← Older revision	Revision as of 12:17, 28 April 2011
(No difference)

Admin: 1 revision: Initial import

2010-11-18T16:31:56Z

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}}}}
====WINDOW - signal window function====

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

<code>WINDOW <var>x type c mode</var></code>

=====Inputs:=====

{|
|-
|x
|window length or frame buffer
|-
|type
|window function type
|-
|c
|window function parameter
|-
|mode
|processing mode
|}

=====Outputs:=====

{|
|-
|<var>y</var>
|window function or windowed signal
|-
|k
|window scaling factor
|}

=====Function:=====

This atom implements a set of well known signal windowing functions. It can be used to compute a windowing function (which should be applied to the signal in a later processing step) or to multiply the signal with a windowing function directly.

The output k is set to a (average) scaling factor that can be used to align the energy of the input signal <var>x</var> and the weighted signal <var>y</var>. To compute the scaling factor, one frame of white noise is used as a test signal. The input <var>mode</var> determines whether the window function should be multiplied with the energy-scaling-factor <var>k</var> (<var>mode</var>=<code>1</code>) or not (<var>mode</var>=<code>0</code>).

Window computation, controlled by data input <var>x</var>

{|
|-
|type of input <var>x</var>
|description
|-
|number
|The value of x (><code>2</code>) is used as window length. The selected window function is computed and stored in the output vector <var>y</var>.
|-
|vector
|The input x is used as signal vector (length >2) and multiplied with the selected window function. The weighted signal is stored in the output <var>y</var>.
|}

Windowing function, selected by <var>type</var> (function type) and <var>c</var> (parameter).

{|
|-
|value of type
|value of c
|window function / comment
|-
|<code>0</code> or <code>RECTANGLE</code>
|<nowiki>-</nowiki>
|rectangle window
|-
|<code>1</code> or <code>HANNING</code>
|<nowiki>-</nowiki>
|Hanning window
|-
|<code>2</code> or <code>HAMMING</code>
|<nowiki>-</nowiki>
|Hamming window
|-
|<code>3</code> or <code>BLACKMAN</code>
|<nowiki>-</nowiki>
|Blackman<nowiki>-</nowiki>Harris window
|-
|<code>4</code> or <code>KAISER</code>
|exponent (>0)
|Kaiser<nowiki>-</nowiki>Bessel window
|-
|<code>5</code> or <code>BARTLETT</code>
|<nowiki>-</nowiki>
|Bartlett (triangle) window
|}