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><channel><title>Prosig Noise &#38; Vibration Blog &#187; FFT : Noise &amp; Vibration Blog : What You Need To Know About Noise &amp; Vibration Measurement</title> <atom:link href="http://blog.prosig.com/tag/fft/feed/" rel="self" type="application/rss+xml" /><link>http://blog.prosig.com</link> <description>Telling you what you need to know about noise &#38; vibration</description> <lastBuildDate>Wed, 25 Jan 2012 14:42:00 +0000</lastBuildDate> <language>en</language> <sy:updatePeriod>hourly</sy:updatePeriod> <sy:updateFrequency>1</sy:updateFrequency> <generator>http://wordpress.org/?v=3.3.1</generator> <item><title>What is Synchronous (Angular) Sampling?</title><link>http://blog.prosig.com/2011/11/09/what-is-synchronous-angular-sampling/</link> <comments>http://blog.prosig.com/2011/11/09/what-is-synchronous-angular-sampling/#comments</comments> <pubDate>Wed, 09 Nov 2011 10:22:14 +0000</pubDate> <dc:creator>Adrian Lincoln</dc:creator> <category><![CDATA[featured]]></category> <category><![CDATA[signal processing]]></category> <category><![CDATA[acoustic]]></category> <category><![CDATA[acoustic data]]></category> <category><![CDATA[acoustics]]></category> <category><![CDATA[angle domain]]></category> <category><![CDATA[angular motion]]></category> <category><![CDATA[FFT]]></category> <category><![CDATA[Fourier]]></category> <category><![CDATA[order domain]]></category> <category><![CDATA[orders]]></category> <category><![CDATA[revolution speed]]></category> <category><![CDATA[rotation angles]]></category> <category><![CDATA[shaft encoder]]></category> <category><![CDATA[synchronous]]></category> <category><![CDATA[synchronous data]]></category> <category><![CDATA[tachometer]]></category> <category><![CDATA[time domain]]></category> <category><![CDATA[vibration]]></category> <category><![CDATA[waterfall]]></category><guid
isPermaLink="false">http://blog.prosig.com/?p=2228</guid> <description><![CDATA[The term synchronous data is usually applied to vibration or acoustic data that is captured from an item of rotating equipment at regularly spaced angle intervals as distinct from regularly...]]></description> <wfw:commentRss>http://blog.prosig.com/2011/11/09/what-is-synchronous-angular-sampling/feed/</wfw:commentRss> <slash:comments>0</slash:comments> </item> <item><title>Video: Noise &amp; Vibration From Rotating Machines</title><link>http://blog.prosig.com/2011/10/04/video-how-to-analyze-noise-vibration-from-rotating-machinery/</link> <comments>http://blog.prosig.com/2011/10/04/video-how-to-analyze-noise-vibration-from-rotating-machinery/#comments</comments> <pubDate>Tue, 04 Oct 2011 08:25:33 +0000</pubDate> <dc:creator>Chris Mason</dc:creator> <category><![CDATA[signal processing]]></category> <category><![CDATA[videos]]></category> <category><![CDATA[FFT]]></category> <category><![CDATA[harmonics]]></category> <category><![CDATA[noise]]></category> <category><![CDATA[noise vibration]]></category> <category><![CDATA[orders]]></category> <category><![CDATA[rotating machinery]]></category> <category><![CDATA[speed]]></category> <category><![CDATA[tacho]]></category> <category><![CDATA[vibration]]></category> <category><![CDATA[waterfall]]></category><guid
isPermaLink="false">http://blog.prosig.com/?p=2514</guid> <description><![CDATA[This is complete version of the video illustrating my recent article How To Measure Noise &#38; Vibration In Rotating Machines. This video was previously published on the blog in 3 parts....]]></description> <wfw:commentRss>http://blog.prosig.com/2011/10/04/video-how-to-analyze-noise-vibration-from-rotating-machinery/feed/</wfw:commentRss> <slash:comments>0</slash:comments> </item> <item><title>Understanding Windowing And Overlapping Analysis</title><link>http://blog.prosig.com/2011/08/30/understanding-windowing-and-overlapping-analysis/</link> <comments>http://blog.prosig.com/2011/08/30/understanding-windowing-and-overlapping-analysis/#comments</comments> <pubDate>Tue, 30 Aug 2011 11:46:29 +0000</pubDate> <dc:creator>John Mathey</dc:creator> <category><![CDATA[signal processing]]></category> <category><![CDATA[FFT]]></category> <category><![CDATA[frequency spectrum]]></category> <category><![CDATA[Hanning]]></category> <category><![CDATA[hanning window]]></category> <category><![CDATA[periodic intervals]]></category> <category><![CDATA[sine wave]]></category> <category><![CDATA[sinusoidal wave]]></category> <category><![CDATA[spectrum]]></category> <category><![CDATA[time block]]></category> <category><![CDATA[time blocks]]></category> <category><![CDATA[window]]></category> <category><![CDATA[windowing]]></category><guid
isPermaLink="false">http://blog.prosig.com/?p=2409</guid> <description><![CDATA[The following article was inspired by a question asked by a reader regarding my previous article - Data Windows : What, why and when?. Specifically, the reader asked &#8220;Could you please...]]></description> <wfw:commentRss>http://blog.prosig.com/2011/08/30/understanding-windowing-and-overlapping-analysis/feed/</wfw:commentRss> <slash:comments>2</slash:comments> </item> <item><title>Amplitude And Energy Correction – A Brief Summary</title><link>http://blog.prosig.com/2009/09/01/amplitude-and-energy-correction-a-brief-summary/</link> <comments>http://blog.prosig.com/2009/09/01/amplitude-and-energy-correction-a-brief-summary/#comments</comments> <pubDate>Tue, 01 Sep 2009 10:44:01 +0000</pubDate> <dc:creator>John Mathey</dc:creator> <category><![CDATA[signal processing]]></category> <category><![CDATA[amplitude]]></category> <category><![CDATA[ENBW]]></category> <category><![CDATA[FFT]]></category> <category><![CDATA[Fourier]]></category> <category><![CDATA[Hanning]]></category> <category><![CDATA[nvh]]></category> <category><![CDATA[rms]]></category><guid
isPermaLink="false">http://blog.prosig.com/?p=266</guid> <description><![CDATA[Amplitude and energy correction has been and is a continuing point of confusion for many people calculating spectra from time domain signals using Fourier transform methods. The first thing to...]]></description> <wfw:commentRss>http://blog.prosig.com/2009/09/01/amplitude-and-energy-correction-a-brief-summary/feed/</wfw:commentRss> <slash:comments>8</slash:comments> </item> <item><title>Data Windows : What, why and when?</title><link>http://blog.prosig.com/2009/07/20/data-windows-what-why-and-when/</link> <comments>http://blog.prosig.com/2009/07/20/data-windows-what-why-and-when/#comments</comments> <pubDate>Mon, 20 Jul 2009 08:23:53 +0000</pubDate> <dc:creator>John Mathey</dc:creator> <category><![CDATA[signal processing]]></category> <category><![CDATA[ENBW]]></category> <category><![CDATA[FFT]]></category> <category><![CDATA[Fourier]]></category> <category><![CDATA[Hanning]]></category> <category><![CDATA[nvh]]></category> <category><![CDATA[Von Hann]]></category> <category><![CDATA[window]]></category><guid
isPermaLink="false">http://blog.prosig.com/?p=219</guid> <description><![CDATA[Before we discuss the use of data windows, we should first remind ourselves of three basic properties of the FFT (Fast Fourier Transform) process. First, energy information in signal must...]]></description> <wfw:commentRss>http://blog.prosig.com/2009/07/20/data-windows-what-why-and-when/feed/</wfw:commentRss> <slash:comments>7</slash:comments> </item> <item><title>10 Great Fourier Transform Links</title><link>http://blog.prosig.com/2009/04/22/10-great-fourier-transform-links/</link> <comments>http://blog.prosig.com/2009/04/22/10-great-fourier-transform-links/#comments</comments> <pubDate>Wed, 22 Apr 2009 13:03:00 +0000</pubDate> <dc:creator>Chris Mason</dc:creator> <category><![CDATA[links]]></category> <category><![CDATA[FFT]]></category> <category><![CDATA[noise]]></category> <category><![CDATA[vibration]]></category> <category><![CDATA[videos]]></category><guid
isPermaLink="false">http://blog.prosig.com/?p=147</guid> <description><![CDATA[Following a discussion in the office about Fourier Transforms we did a little searching on the web. As always, we discovered that the Internet is packed with some great resources...]]></description> <wfw:commentRss>http://blog.prosig.com/2009/04/22/10-great-fourier-transform-links/feed/</wfw:commentRss> <slash:comments>7</slash:comments> </item> <item><title>Sound Steering</title><link>http://blog.prosig.com/2007/09/12/sound-steering/</link> <comments>http://blog.prosig.com/2007/09/12/sound-steering/#comments</comments> <pubDate>Wed, 12 Sep 2007 09:54:20 +0000</pubDate> <dc:creator>Dr Colin Mercer</dc:creator> <category><![CDATA[applications]]></category> <category><![CDATA[signal processing]]></category> <category><![CDATA[acoustic]]></category> <category><![CDATA[automotive]]></category> <category><![CDATA[FFT]]></category> <category><![CDATA[microphone]]></category> <category><![CDATA[noise]]></category> <category><![CDATA[nvh]]></category> <category><![CDATA[orders]]></category> <category><![CDATA[pump]]></category> <category><![CDATA[Richard O'Sullivan]]></category> <category><![CDATA[runup]]></category> <category><![CDATA[steering pump]]></category> <category><![CDATA[waterfalls]]></category><guid
isPermaLink="false">http://prosig.com/blog/?p=3</guid> <description><![CDATA[The requirement was to develop a ‘standard’ test for assessing the sound quality of power steering pumps in vehicles. Measurements needed to be objective so that the method would be...]]></description> <wfw:commentRss>http://blog.prosig.com/2007/09/12/sound-steering/feed/</wfw:commentRss> <slash:comments>0</slash:comments> </item> <item><title>Order Cuts And Overall Level</title><link>http://blog.prosig.com/2007/02/25/order-cuts-and-overall-level/</link> <comments>http://blog.prosig.com/2007/02/25/order-cuts-and-overall-level/#comments</comments> <pubDate>Sun, 25 Feb 2007 14:38:43 +0000</pubDate> <dc:creator>Dr Colin Mercer</dc:creator> <category><![CDATA[signal processing]]></category> <category><![CDATA[FFT]]></category> <category><![CDATA[nvh]]></category> <category><![CDATA[orders]]></category> <category><![CDATA[overall level]]></category> <category><![CDATA[rms]]></category> <category><![CDATA[waterfall]]></category><guid
isPermaLink="false">http://blog.prosig.com/2007/02/25/order-cuts-and-overall-level/</guid> <description><![CDATA[Order cuts are taken from a set of FFTs, each one at a different rpm. The rms level is then found as the Square root of the Sum of the...]]></description> <wfw:commentRss>http://blog.prosig.com/2007/02/25/order-cuts-and-overall-level/feed/</wfw:commentRss> <slash:comments>0</slash:comments> </item> <item><title>Average Waterfalls Or Average Orders?</title><link>http://blog.prosig.com/2005/06/14/average-waterfalls-or-average-orders/</link> <comments>http://blog.prosig.com/2005/06/14/average-waterfalls-or-average-orders/#comments</comments> <pubDate>Tue, 14 Jun 2005 20:51:52 +0000</pubDate> <dc:creator>Dr Colin Mercer</dc:creator> <category><![CDATA[signal processing]]></category> <category><![CDATA[FFT]]></category> <category><![CDATA[Hanning]]></category> <category><![CDATA[nvh]]></category> <category><![CDATA[orders]]></category> <category><![CDATA[rotating machinery]]></category><guid
isPermaLink="false">http://blog.prosig.com/2005/06/14/average-waterfalls-or-average-orders/</guid> <description><![CDATA[One would expect that averaging waterfalls and then extracting orders would give the same result as extracting orders from individual waterfalls and then averaging them. This is not the case....]]></description> <wfw:commentRss>http://blog.prosig.com/2005/06/14/average-waterfalls-or-average-orders/feed/</wfw:commentRss> <slash:comments>0</slash:comments> </item> <item><title>Notes On Fourier Analysis</title><link>http://blog.prosig.com/2003/07/29/notes-on-fourier-analysis/</link> <comments>http://blog.prosig.com/2003/07/29/notes-on-fourier-analysis/#comments</comments> <pubDate>Tue, 29 Jul 2003 14:39:56 +0000</pubDate> <dc:creator>Dr Colin Mercer</dc:creator> <category><![CDATA[signal processing]]></category> <category><![CDATA[DFT]]></category> <category><![CDATA[ENBW]]></category> <category><![CDATA[FFT]]></category> <category><![CDATA[Fourier]]></category> <category><![CDATA[Nyquist]]></category><guid
isPermaLink="false">http://prosig.com/blog/?p=5</guid> <description><![CDATA[Fourier analysis takes a signal and represents it either as a series of cosines (real part) and sines (imaginary part) or as a cosine with phase (modulus and phase form)....]]></description> <wfw:commentRss>http://blog.prosig.com/2003/07/29/notes-on-fourier-analysis/feed/</wfw:commentRss> <slash:comments>14</slash:comments> </item> <item><title>Frequency, Hertz &amp; Orders</title><link>http://blog.prosig.com/2002/02/03/frequency-hertz-orders/</link> <comments>http://blog.prosig.com/2002/02/03/frequency-hertz-orders/#comments</comments> <pubDate>Sun, 03 Feb 2002 17:09:46 +0000</pubDate> <dc:creator>Dr Colin Mercer</dc:creator> <category><![CDATA[signal processing]]></category> <category><![CDATA[FFT]]></category> <category><![CDATA[Nyquist]]></category> <category><![CDATA[orders]]></category> <category><![CDATA[rotating machinery]]></category><guid
isPermaLink="false">http://blog.prosig.com/2002/02/03/frequency-hertz-orders/</guid> <description><![CDATA[The most common form of digitising data is to use a regular time based method. That is data is sampled at a constant rate specified as a number of samples/second....]]></description> <wfw:commentRss>http://blog.prosig.com/2002/02/03/frequency-hertz-orders/feed/</wfw:commentRss> <slash:comments>0</slash:comments> </item> <item><title>Understanding The Cross Correlation Function</title><link>http://blog.prosig.com/2001/06/06/correlation-example/</link> <comments>http://blog.prosig.com/2001/06/06/correlation-example/#comments</comments> <pubDate>Wed, 06 Jun 2001 14:22:29 +0000</pubDate> <dc:creator>Dr Colin Mercer</dc:creator> <category><![CDATA[popular]]></category> <category><![CDATA[signal processing]]></category> <category><![CDATA[coherence]]></category> <category><![CDATA[correlation]]></category> <category><![CDATA[FFT]]></category> <category><![CDATA[microphone]]></category> <category><![CDATA[noise]]></category><guid
isPermaLink="false">http://prosig.com/blog/?p=4</guid> <description><![CDATA[To illustrate the use of the cross correlation function, a source location example is shown below. For this it is assumed there is a noise source at some unknown position...]]></description> <wfw:commentRss>http://blog.prosig.com/2001/06/06/correlation-example/feed/</wfw:commentRss> <slash:comments>3</slash:comments> </item> <item><title>Data Decimation. What Do I Do?</title><link>http://blog.prosig.com/2001/06/06/data-decimation-what-do-i-do/</link> <comments>http://blog.prosig.com/2001/06/06/data-decimation-what-do-i-do/#comments</comments> <pubDate>Wed, 06 Jun 2001 14:13:40 +0000</pubDate> <dc:creator>Dr Colin Mercer</dc:creator> <category><![CDATA[signal processing]]></category> <category><![CDATA[aliasing]]></category> <category><![CDATA[decimate]]></category> <category><![CDATA[decimation]]></category> <category><![CDATA[FFT]]></category> <category><![CDATA[Nyquist]]></category><guid
isPermaLink="false">http://blog.prosig.com/2001/06/06/data-decimation-what-do-i-do/</guid> <description><![CDATA[Sometimes we have digitised data at a much higher rate than we need. How can we reduce the sampling rate? If I wanted to say halve the sample rate can...]]></description> <wfw:commentRss>http://blog.prosig.com/2001/06/06/data-decimation-what-do-i-do/feed/</wfw:commentRss> <slash:comments>0</slash:comments> </item> </channel> </rss>
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