Editing Spectrum analyzer (section)

== History ==
{{expand section|date=December 2012}}
[[Image:sonagraphe.jpg|thumb|right|A spectrum analyzer circa 1970]]
The first spectrum analyzers, in the 1960s, were swept-tuned instruments.<ref name="Hiebert">''[http://electronicdesign.com/displays/take-peek-inside-todays-spectrum-analyzers Take A Peek Inside Today's Spectrum Analyzers] {{webarchive|url=https://web.archive.org/web/20170506192902/http://www.electronicdesign.com/displays/take-peek-inside-todays-spectrum-analyzers |date=2017-05-06 }}''; Bob Hiebert, 2005, accessed 10 April 2013.</ref>

Following the discovery of the [[fast Fourier transform]] (FFT) in 1965, the first FFT-based analyzers were introduced in 1967.<ref name="Deery">''[http://www.sandv.com/downloads/0701deer.pdf The 'Real' History of Real-Time Spectrum Analyzers] {{webarchive|url=https://web.archive.org/web/20150621073829/http://www.sandv.com/downloads/0701deer.pdf |date=2015-06-21 }}''; Joe Deery, 2007, accessed 10 April 2013.</ref>

Today, there are three basic types of analyzer: the swept-tuned spectrum analyzer, the vector signal analyzer, and the real-time spectrum analyzer.<ref name="Hiebert" />