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{{About|the sound processing technology|the company that created it|SRS Labs Inc.}}
{{Refimprove|date=February 2009}}
[[File:SRS corp logo.svg|thumb|SRS]]
'''Sound Retrieval System''' (SRS) is a patented [[psychoacoustic]] 3D audio processing technology originally invented by Arnold Klayman in the early 1980s.{{Citation needed|date=October 2021}} The SRS technology applies [[head-related transfer function]]s (HRTFs) to create an immersive 3D soundfield using only two speakers, widening the "[[sweet spot (acoustics)|sweet spot]]", creating a more spacious sense of ambience, and producing strong localization cues for discrete instruments within an audio mix.<ref name=hughes>[http://www.avahifi.com/images/avahifi/root/audio_basics/ab_pdf/ab1992-05.pdf Audio Basics newsletter, vol 10, (double) number 5 and 6, May and June 1991, pp2-3]</ref> SRS is not a [[Dolby Pro Logic|Dolby matrix surround]] decoder but works with normal stereo recordings.{{Citation needed|date=October 2021}}

==History==
[[File:SRS Tru Bass.svg|100px|thumb|"SRS Tru Bass" logo]]
[[File:SRS Dialog Clarity.svg|100px|thumb|"SRS Dialog Clarity" logo]]
[[File:SRS TruSurroundXT logo.svg|100px|thumb|"SRS TruSurroundXT" logo]]
Initially [[Hughes Aircraft]], for whom Klayman was doing acoustic consulting at the time, offered a standalone SRS audio processor,<ref name=hughes/> as well as licensing the technology to [[Sony]] and [[Thomson SA|Thomson]] ([[RCA]]) for inclusion in their products. In the early 1990s, Hughes sold off its non-aerospace-related holdings, and a group of entrepreneurs formed [[SRS Labs]] to acquire the SRS technology.{{Citation needed|date=October 2021}}

Many TV sets employ built-in SRS to make their built-in audio systems soundstages "bigger". An article in the November 1994 issue of [[Consumers Digest]] magazine tested several SRS-equipped sets from [[Sony]] and other manufacturers and concluded that the circuit was essentially a gimmick in these products due to their small, close-set speakers and low-wattage amplifiers. SRS is not a [[panacea]] for audio systems that are marginal to begin with; it works best with full-range, high-fidelity sound reproduction.{{Citation needed|date=October 2021}}

The company (publicly traded on [[NASDAQ]] under the symbol SRSL after a 1996 [[Initial public offering|IPO]]) since developed or acquired several additional audio technologies, including SRS Headphone, TruSurround XT, TruBass ("psychoacoustic bass enhancement to enable deeper, natural bass of audio source material to be perceived over small speaker drivers"), FOCUS ("sound-image elevation used in combination with SRS to create a large sound image", originally conceived for in-car listening), SRS Virtual Surround, Circle Surround, SRS Wow (an audio-enhancement suite made up of SRS 3D "wide stereo imaging and nonfatiguing headphone listening mode", Focus and TruBass<ref>[http://reviews.cnet.com/8301-10921_7-6384149-4.html SRS Labs Wow technology explained, 14 November 2005]</ref>) and SRS Wow HD, Dialog Clarity, and VIP, most using psychoacoustic principles similar to those employed by the SRS technology. SRS or one of its derivatives is offered in products from a wide range of professional and consumer audio manufacturers as well as in SRS's own small stable of products. The company derives most of its revenue from licensing its technologies, which it does in both silicon and software form.{{Citation needed|date=October 2021}}

SRS Wow was implemented in many devices such as music players, and in software such as [[Microsoft]]'s [[Windows Media Player]] for playing sound on a computer.<ref>[http://windows.microsoft.com/en-gb/windows/change-media-player-audio-effects#1TC=windows-7 Microsoft: Changing bass, stereo and other audio effects in Windows Media Player] "You can enhance low-frequency and stereo sound performance by turning on SRS WOW effects".</ref>

In 2012 [[DTS (sound system)|DTS, Inc.]] acquired the business of SRS Labs, including over 1,000 audio patents and trademarks.<ref name="DTS-merge-with-SRS">{{cite web|url=http://www.dts.com:80/corporate/dts-history.aspx|archiveurl=https://web.archive.org/web/20120818044203/http://www.dts.com:80/corporate/dts-history.aspx|title=In 2012, DTS acquired SRS Labs, a leader in audio processing and enhancement.|website=dts.com|archivedate=August 18, 2012|date=2014|accessdate=October 1, 2021|via=[[The Internet Archive]]}}</ref><ref name="SRSL-delisted-nasdaq">{{cite web|url=https://docoh.com/company/1016470/SRSL|title=SRSL SRS Labs no longer listed on Nasdaq|publisher=SRS labs|accessdate=2021-10-01}}</ref>

The original SRS patents are {{patent|US|4866774}}, {{patent|US |4748669}} and {{patent|US|4841572}}, which expired between 2006 and 2008. Patents may apply in other countries

==See also==
* [[SRS Labs]]
* [[DSEE]]
*[[DTS (sound system)]]
*[[QSound]]

==References==
{{reflist}}

==External links==
* [https://web.archive.org/web/20080509190819/http://www.srslabs.com/ Wayback Machine archives of SRS Web site] for many dates.
* [http://www.srslabs.com/ URL of former SRS Labs official site, redirects to DTS]

[[Category:Acoustics]]

Sound Retrieval System - Revision history

imported>Majoau: /* See also */