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><channel><title>Prosig Noise &#38; Vibration Blog &#187; Nyquist : Noise &amp; Vibration Blog : What You Need To Know About Noise &amp; Vibration Measurement</title> <atom:link href="http://blog.prosig.com/tag/nyquist/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>Which Should I Use? Real &amp; imaginary? Or magnitude &amp; phase?</title><link>http://blog.prosig.com/2011/05/04/which-should-i-use-real-imaginary-or-magnitude-phase/</link> <comments>http://blog.prosig.com/2011/05/04/which-should-i-use-real-imaginary-or-magnitude-phase/#comments</comments> <pubDate>Wed, 04 May 2011 11:47:29 +0000</pubDate> <dc:creator>Adrian Lincoln</dc:creator> <category><![CDATA[popular]]></category> <category><![CDATA[signal processing]]></category> <category><![CDATA[accelerometer]]></category> <category><![CDATA[accelerometers]]></category> <category><![CDATA[complex]]></category> <category><![CDATA[imaginary]]></category> <category><![CDATA[imaginary components]]></category> <category><![CDATA[magnitude]]></category> <category><![CDATA[modulus]]></category> <category><![CDATA[Nyquist]]></category> <category><![CDATA[phase]]></category> <category><![CDATA[phase components]]></category> <category><![CDATA[phase type]]></category> <category><![CDATA[polar]]></category> <category><![CDATA[real]]></category> <category><![CDATA[sinusoid]]></category> <category><![CDATA[sinusoidal excitation]]></category> <category><![CDATA[sinusoidal signals]]></category> <category><![CDATA[vibration signals]]></category><guid
isPermaLink="false">http://blog.prosig.com/?p=2007</guid> <description><![CDATA[In one of our recent articles a question was asked regarding the practical use of real &#38; imaginary type plots compared with modulus &#38; phase type plots. In general, noise...]]></description> <wfw:commentRss>http://blog.prosig.com/2011/05/04/which-should-i-use-real-imaginary-or-magnitude-phase/feed/</wfw:commentRss> <slash:comments>7</slash:comments> </item> <item><title>10 Educational Mechanical Engineering Videos</title><link>http://blog.prosig.com/2010/05/17/10-educational-engineering-videos/</link> <comments>http://blog.prosig.com/2010/05/17/10-educational-engineering-videos/#comments</comments> <pubDate>Mon, 17 May 2010 13:44:11 +0000</pubDate> <dc:creator>Chris Mason</dc:creator> <category><![CDATA[videos]]></category> <category><![CDATA[aliasing]]></category> <category><![CDATA[differential]]></category> <category><![CDATA[Fourier]]></category> <category><![CDATA[gas turbine]]></category> <category><![CDATA[Nyquist]]></category> <category><![CDATA[strain gage]]></category> <category><![CDATA[strain gauge]]></category><guid
isPermaLink="false">http://blog.prosig.com/?p=884</guid> <description><![CDATA[We&#8217;ve had a good look around YouTube and dug up a great collection of educational mechanical engineering videos. There&#8217;s a wide range of information here from simple maths tutorial to...]]></description> <wfw:commentRss>http://blog.prosig.com/2010/05/17/10-educational-engineering-videos/feed/</wfw:commentRss> <slash:comments>5</slash:comments> </item> <item><title>Interpolation Versus Resampling To Increase The Sample Rate</title><link>http://blog.prosig.com/2009/06/22/interpolation-versus-resampling-to-increase-the-sample-rate/</link> <comments>http://blog.prosig.com/2009/06/22/interpolation-versus-resampling-to-increase-the-sample-rate/#comments</comments> <pubDate>Mon, 22 Jun 2009 14:12:21 +0000</pubDate> <dc:creator>Dr Colin Mercer</dc:creator> <category><![CDATA[signal processing]]></category> <category><![CDATA[decimate]]></category> <category><![CDATA[decimation]]></category> <category><![CDATA[interpolate]]></category> <category><![CDATA[interpolation]]></category> <category><![CDATA[Lagrange]]></category> <category><![CDATA[Nyquist]]></category> <category><![CDATA[resample]]></category> <category><![CDATA[sinc]]></category> <category><![CDATA[spikes]]></category><guid
isPermaLink="false">http://blog.prosig.com/?p=194</guid> <description><![CDATA[These are two different techniques aimed at different objectives. First consider a simple sinewave that has been sampled close to the Nyquist frequency (sample rate/2). Visually this looks very pointy. We...]]></description> <wfw:commentRss>http://blog.prosig.com/2009/06/22/interpolation-versus-resampling-to-increase-the-sample-rate/feed/</wfw:commentRss> <slash:comments>5</slash:comments> </item> <item><title>Evaluating A Closed Loop Control System For High Pressure Pumps</title><link>http://blog.prosig.com/2007/03/29/evaluating-a-closed-loop-control-system-for-high-pressure-pumps/</link> <comments>http://blog.prosig.com/2007/03/29/evaluating-a-closed-loop-control-system-for-high-pressure-pumps/#comments</comments> <pubDate>Thu, 29 Mar 2007 11:57:54 +0000</pubDate> <dc:creator>James Wren</dc:creator> <category><![CDATA[applications]]></category> <category><![CDATA[signal processing]]></category> <category><![CDATA[angle domain]]></category> <category><![CDATA[closed loop]]></category> <category><![CDATA[engine]]></category> <category><![CDATA[Nyquist]]></category> <category><![CDATA[pump]]></category> <category><![CDATA[tachometer]]></category><guid
isPermaLink="false">http://blog.prosig.com/2007/03/29/evaluating-a-closed-loop-control-system-for-high-pressure-pumps/</guid> <description><![CDATA[Prosig were recently involved in the validation of a closed loop control system for an automotive pump supplier. The customer has a large number of test cells, each test cell...]]></description> <wfw:commentRss>http://blog.prosig.com/2007/03/29/evaluating-a-closed-loop-control-system-for-high-pressure-pumps/feed/</wfw:commentRss> <slash:comments>1</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>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> <item><title>Removing Phase Delay Using Phaseless Filtering</title><link>http://blog.prosig.com/2001/06/06/removing-phase-delay-using-phaseless-filtering/</link> <comments>http://blog.prosig.com/2001/06/06/removing-phase-delay-using-phaseless-filtering/#comments</comments> <pubDate>Wed, 06 Jun 2001 09:16:07 +0000</pubDate> <dc:creator>Dr Colin Mercer</dc:creator> <category><![CDATA[signal processing]]></category> <category><![CDATA[Bessel]]></category> <category><![CDATA[Butterworth]]></category> <category><![CDATA[Chebyshev]]></category> <category><![CDATA[filtering]]></category> <category><![CDATA[frequency]]></category> <category><![CDATA[nvh]]></category> <category><![CDATA[Nyquist]]></category> <category><![CDATA[phase delay]]></category> <category><![CDATA[phaseless]]></category><guid
isPermaLink="false">http://blog.prosig.com/2001/06/06/removing-phase-delay-using-phaseless-filtering/</guid> <description><![CDATA[In many instances we need to filter a signal to remove unwanted frequencies. If we use classical filters such as Butterworth, Chebyshev or even Bessel then a phase delay is...]]></description> <wfw:commentRss>http://blog.prosig.com/2001/06/06/removing-phase-delay-using-phaseless-filtering/feed/</wfw:commentRss> <slash:comments>0</slash:comments> </item> </channel> </rss>
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