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Topic: Window function

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Kaiser window

Julius von Hann

Frequency spectrum

Frequency domain

Power spectrum

Stationary process

Convolution theorem

Power spectral density

Spectrogram

White noise

Fourier transform

Digital signal processing

Fast Fourier transform

Time domain

Deconvolution

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	Window function - Wikipedia, the free encyclopedia
		In signal processing, a window function (or apodization function) is a function that is zero-valued outside of some chosen interval.
		For instance, a function that is constant inside the interval and zero elsewhere is called a rectangular window, which describes the shape of its graphical representation.
		The Hann window is sometimes called the "Hanning" window, in analogy to the Hamming window.
	en.wikipedia.org /wiki/Window_function (1494 words)

	Window Features
		The coordinates of a top-level window are relative to the upper left corner of the screen; the coordinates of a child window are relative to the upper left corner of the parent window.
		The CascadeWindows function cascades the windows on the desktop or cascades the child windows of the specified parent window.
		The TileWindows function tiles the windows on the desktop or tiles the child windows of the specified parent window.
	msdn.microsoft.com /library/en-us/winui/winui/windowsuserinterface/windowing/windows/windowfeatures.asp?frame=true (6979 words)

	Window (disambiguation) - Wikipedia, the free encyclopedia
		Look up window and windows in Wiktionary, the free dictionary.
		Window, an opening in an otherwise solid, opaque surface, through which light can pass
		Window (computing), a display rectangle used by a graphical user interface (GUI)
	en.wikipedia.org /wiki/Window_(disambiguation) (134 words)

	Windowed sinc function
		The Lanczos window, which is the central lobe of a sinc function scaled to a certain extend.
		The frequency responses of the sinc filter windowed with all these windows and the windows themselves are depicted in Appendix B.
		Windowed sinc functions are reported to perform quite well, based on a purely quantitative comparison to linear interpolation, with Welch, Lanzcos and Kaiser windows, the truncated sinc kernel is reported to be one of the worst performing kernels.
	www.cg.tuwien.ac.at /~theussl/DA/node34.html (769 words)

	Window functions (Site not responding. Last check: 2007-10-05)
		The fixed shape window functions (Hanning, Hamming and Blackman) are plotted in the diagram opposite.
		In common with all tapered data window functions, these are symmetrical about the centre line (n = 0) and have a maximum value of 1, tapering towards zero on both sides (although some window functions, such as the Hamming window, do not quite reach zero at either end).
		The versatility of the Kaiser window is evident.
	www.dsptutor.freeuk.com /WindowFunctionPlot/notes.html (195 words)

	Window functions
		A quick way to see the shape of a chosen function is to open the FID to which it will be applied and execute the 21 command.
		This is a gaussian function for 2D data, in which the center of the gaussian is shifted based on the slice number.
		Multiply the reals and imaginaries by a window function which is the first half of a sine wave.
	www.acornnmr.com /NutsHelp/apodization.html (1112 words)

	CZ: Window Function (Site not responding. Last check: 2007-10-05)
		Window function is itself a kind of Ring Modulation (AM), as the waveform below shows.
		CZ's usual resonant waves are generated by 'Sine Sync' wave modulated by Sawtooth, Triangle, and Trapezoid wave as 'Windows.' The resonance character is determined by the window wave.
		I call the last window function as 'Spike', as it adds a spike to the original waveform.
	homepage.mac.com /synth_seal/html/cz1b.html (177 words)

	Introduction to DSP - Frequency analysis: Windowing (Site not responding. Last check: 2007-10-05)
		Put mathematically, a window function has the property that its value and all its derivatives are zero at the ends.
		Multiplying by a window function (called 'windowing') suppresses glitches and so avoids the broadening of the frequency spectrum caused by the glitches.
		Windowing can narrow the spectrum and make it closer to what was expected.
	www.bores.com /courses/intro/freq/3_window.htm (215 words)

	Place voicing window function - Integer version
		If such a placement is not within * the window's placement range, then the window is placed in the left- * most portion of the placement range.
		If the first onset is in 2F and there is sufficient room to place * the window immediately before this onset, then the window is placed * there, and its length is set to the maximum possible under these * constraints.
		The * window's length * is the longest length that can fit in the range under these constraints, * except that the window may be shortened even further to avoid overlapping * other onsets in the placement range.
	www.ece.cmu.edu /~ee551/Old_projects/projects/s_96_3/lpcana/placev_i.html (485 words)

	GtkWindow
		The title of a window will be displayed in its title bar; on the X Window System, the title bar is rendered by the window manager, so exactly how the title appears to users may vary according to a user's exact configuration.
		By setting the type hint for the window, you allow the window manager to decorate and handle the window in a way which is suitable to the function of the window in your application.
		Windows may set a hint asking the desktop environment not to receive the input focus when the window is mapped.
	developer.gnome.org /doc/API/2.0/gtk/GtkWindow.html (4149 words)

	Windowing and the DFT (Site not responding. Last check: 2007-10-05)
		One option is to alter the window function by which we truncate the signal with a function that produces less ripples.
		The windows frequency response is just the same as it was back in the Theory of the DFT section.
		An ideal window function would have all the energy in the main lobe of the sinc function (around the y-axis) and decay to zero with no ripples.
	astron.berkeley.edu /~jrg/ngst/fft/window.html (419 words)

	Window Function (DSP Blockset)
		The Window Function block has three modes of operation, which are selected by the Operation parameter.
		In the cases when the window is being applied to an input (Generate and apply window or Apply window to input selected from the Operation menu), the block assumes that the input is an M-by-N frame matrix.
		Increasing Beta widens the mainlobe and decreases the amplitude of the window sidelobes in the window's frequency magnitude response.
	www.tau.ac.il /cc/pages/docs/matlab/help/toolbox/dspblks/windowfunction.html (459 words)

	Window Function (DSP Blockset)
		In this mode the block generates a sample-based 1-D window vector, w, with length M specified by the Window length parameter.
		For the generalized-cosine windows (Blackman, Hamming, and Hann), the Sampling parameter determines whether the window samples are computed in a periodic or a symmetric manner.
		widens the mainlobe and decreases the amplitude of the window sidelobes in the window's frequency magnitude response.
	www.weizmann.ac.il /matlab/toolbox/dspblks/windowfunction.html (680 words)

	WCI PFC Tip Details
		Suppress Messages on CloseQuery: when closing a window, it is desirable to suppress the display of error messages and allow PFC to display a suitable generic message in its CloseQuery logic.
		Scenario: the user makes changes to Window A (without saving these changes), then the user opens Window B. If the user tried to close the application while on Window B, the user would be prompted to save Window A but the Window B would be showing in the background.
		The window function f_Shutdown() avoids the two problems and it is easy for developers to call.
	www.woodger.ca /pb_tipfc.htm (886 words)

	Interference Suppression \| RF Design - windows for multitone suppression, interference suppression
		The behavior of windows, in terms of their sidelobe peak, asymptotic decay or mainlobe width, is determined by the type of function and the criteria used to determine their coefficients.
		The energy in the sidelobes is minimized by forcing the frequency function to vanish at frequencies where the amplitudes of individual terms (in the frequency function) are maximum.
		This function is called a cosine-powered window and as evident from the Table 1, its asymptotic decay is proportional to the power of the cosine function.
	rfdesign.com /mag/radio_comparing_windows_multitone/index.html (1528 words)

	Encyclopedia article: Window function (Site not responding. Last check: 2007-10-05)
		Window functions are applied to avoid discontinuities at the beginning and the end of a set of data (A collection of facts from which conclusions may be drawn).
		The following windows are normalized for a MDCT (additional info and facts about MDCT) on the range of [−1, +1].
		When using FFT (additional info and facts about FFT) or DCT (additional info and facts about DCT) for spectral analysis a sample belongs to one analysis window.
	www.absoluteastronomy.com /encyclopedia/w/wi/window_function.htm (391 words)

	Zend Technologies - Beginner Tutorials - JavaScript Powered PHP Debugging
		The function uses a static variable to track whether or not a remote window has been opened.
		function converts any newline characters to html linebreaks to assure that the script output is uninterrupted.
		function takes two parameters; $name, a string name of the variable or a message to print, and $data, an unknown variable, which is typically an array.
	www.zend.com /zend/tut/tutorial-DebugLib.php (858 words)

	Windowing (Site not responding. Last check: 2007-10-05)
		Solution: multiple the signal by a window function that is zero outside some defined range.
		One way to avoid disconitinuities at the ends is to taper the signal to zero or near zero and hence reduce the mismatch.
		As stated in section 4.1.4, multiplication of the signal by a window function in the time domain is the same as convolving the signal in the frequency domain.
	svr-www.eng.cam.ac.uk /~ajr/SA95/node26.html (276 words)

	Special Function Window (08580)
		Whether your style is casual, contemporary, elegant, or simply unique, we have windows that allow you to view the world through the shape that fits your lifestyle.
		Unique storm windows that are invisible for use in renovation of wood, steel, or aluminum windows in office buildings, historic restorations, industrial plants, museums, schools, hotels, medical or...
		BiltBest Windows, founded in 1947, is a top of the line Manufacturer of wood and aluminum clad wood windows and patio doors.
	www.aecinfo.com /1/category/00/36/15/category_1.html (2177 words)

	JavaScript Primers #12
		That window was then filled with another HTML document we named in the instance.
		Here, we're going to create a new window function where the new window and all of its contents will be carried along in the same HTML document.
		The effect is exactly the same as in Primer 10: The same sized window opened and it contained the same two links.
	www.htmlgoodies.com /primers/jsp/article.php/3478241 (522 words)

	PDGWINDOW - Takes the "window function" of the current arrays (Site not responding. Last check: 2007-10-05)
		Replaces the data in the current arrays (which should have monotonically increasing X values) with their window function, as defined by Scargle (ApJ 263, 835, 1982).
		function, and the caution given for that function regarding lengthy evaluation times applies also to
		One would normally calculate a data set's window function in addition to its periodogram (PDGRAM) to ensure that any peaks in the latter are not an artefact of the sampling frequency.
	star-www.rl.ac.uk /star/dvi/sun50.htx/node151.html (179 words)

	[No title]
		This type of window can be used to produce "editable" graphics that can be modified using comdraw of one of the other applications of the ivtools package.
		Functions in the present section are maintained for backward compatibility, but their use should be avoided.
		This function is useful for providing an echo to the user during a mouse drag operation.
	lush.sourceforge.net /lush-manual/8086460c.html (4787 words)

	window function
		i convolute the input signal with this window function.
		There is no simple function (Random number gerator -- PN sequence is an exception) with the property u desire.
		For example the cross corelation of the chirp signal is also close to delta function.
	www.edaboard.com /ftopic89936.html (142 words)

	Class member as window callback function??? - GameDev.Net Discussion Forums
		Using RegisterClass for each window is valid, but bare in mind that on 95-based systems, there is limit to how many window classes can be registered - and thus how many windows you can have.
		Although your program is unlikely to fail unless it creates thousands of windows (which is asking for trouble anyway), it's probably good practice to use up as few system resources as possible.
		The longs you store are kept in the same bit of memory that Windows allocates for the style, extended style, and a few other bits and pieces, which will be referenced by the internal window array.
	www.gamedev.net /community/forums/viewreply.asp?ID=316151 (620 words)

	Arnab's Graph Explorer (Site not responding. Last check: 2007-10-05)
		Graph Explorer actually has a sophisticated system of defining functions to plot, which lets you use variables or call other user defined or mathematical functions.
		Either you will have to change the window size, or you must scale the graph down by holding Shift and dragging the mouse left.
		Rewrote function codes using RPN concept, which is much faster (especially for complecated functions).
	www.geocities.com /hirak_99/goodies/graph.html (595 words)

	Window function (Site not responding. Last check: 2007-10-05)
		I am looking for a window function that doesn't smear frequencies that fall
		A rectangular window is the only window that will do that.
		Don't ask me to prove it, but windows, in effect, smear the smearing.
	www.dsprelated.com /showmessage/9891/1.php (712 words)

	moock>> web>> flash
		In the first technique for launching a new browser window from Flash, we use a button with an FSCommand that calls a JavaScript function.
		As verification that the code in the window function is not causing the problem, we can test the function using the HTML button below.
		When called from the HTML form, the window function launches the new window normally.
	www.moock.org /webdesign/flash/launchwindow/launchwindow.html (346 words)

	Signal Processing Toolbox 6.0 Release Notes (Signal Processing Toolbox Release Notes)
		function can be run on any structure without converting to transfer function form.
		This window is also known as a de la Vallé-Poussin window.
		function has been updated to be more accurate for IIR filters with poles/zeros very close to the unit circle.
	www.weizmann.ac.il /matlab/base/relnotes/signal/signal13.html (1238 words)

	Tapered Data Windows (Site not responding. Last check: 2007-10-05)
		The applet plots the shape of some of the commonly-used window functions.
		These functions are used to reduce leakage in the determination of the frequency spectra of sampled signals, and in the design of FIR (finite impulse response) digital filters.Simply select the window function(s) you want displayed by clicking the appropriate checkbox(es).
		Unchecking a checkbox clears that window function from the plot.
	www.dsptutor.freeuk.com /WindowFunctionPlot/wf102.html (174 words)

	AllAPI.net - Your #1 source for using API-functions in Visual Basic!
		The function sends WM_DESTROY and WM_NCDESTROY messages to the window to deactivate it and remove the keyboard focus from it.
		The function also destroys the window’s menu, flushes the thread message queue, destroys timers, removes clipboard ownership, and breaks the clipboard viewer chain (if the window is at the top of the viewer chain).
		If the function fails, the return value is zero.
	www.mentalis.org /apilist/DestroyWindow.shtml (123 words)

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