MS Stereo-Tutorial

MS Stereo-Tutorial

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• STUDIO RIBBON MICS • MIC POSITIONERSAudio Engineering • TALL STANDS • ACCESSORIES AssociatesMS Stereo - A Brief TutorialBy Ron Streicher© 1982 Developed for stereo broadcasting by Lauridsen of Danish Radio in the late 1950’s, MS stereo has rapidly gained favor in Europe as the technique of choice. However it was not until the advent of stereo television broadcasts in the US that this technique started to be widely known here. Wes Dooley and Ron Streicher’s seminal technical papers and their use of MS in the Emmy Award winning broad-cast by KCET of Beethoven’s Ninth Symphony performed by the LA Philharmonic and the LA Master Chorale accelerated this process. Subsequently, the system has gained users as diverse as WGBH, LSU, NPR and Academy Award winning cinema sound facilities such as Blue Light and Lucasfilm’s Sprocket Systems. Quality stereo production with uncompromised monaural compatability can be done quickly and easily in M/S stereo. Only with this method can a good, versatile stereo image be achieved while maintaining a fully discrete monaural signal. An automatic benefit is the reduction of the ambience component that occurs when M/S stereo is summed to mono. The new “dual mode” MS38 DM and MS380 TX reflect continuing development of the potentials of MS. Widespread international use of the original MS38 provided the user feedback that is incor-porated in the new generation of “dual mode” units. New ...

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Audio Engineering    Associates
MSStereo-ABriefTutorial ByRonStreicher
STUDIORIBBONMICS MICPOSITIONERS TALLSTANDS  ACCESSORIES  
©1982 DevelopedforstereobroadcastingbyLauridsenofDanishRadiointhelate1950s,MSstereo  hasrapidlygainedfavorinEuropeasthetechniqueofchoice.ontveadethltinutonsawtireHowevf stereotelevisionbroadcastsintheUSthatthistechniquestartedtobewidelyknownhere.esDooleyW  andRonStreichersseminaltechnicalpapersandtheiruseofMSintheEmmyAwardwinningbroad-castbyKCETofBeethovensNinthSymphonyperformedbytheLAPhilharmonicandtheLAMaster  Choraleacceleratedthisprocess.tnylqeeueys,htSubsasWGBH,resusasvidesreemstashaigdne LSU,NPRandAcademyAwardwinningcinemasoundfacilitiessuchasBlueLightandLucaslms  SprocketSystems. Qualitystereoproductionwithuncompromisedmonauralcompatabilitycanbedonequicklyand  easilyinM/Sstereo.Onlyteohsimhhtwtive,odgoancadioeretselitasramegbecaihvedewhile  maintainingafullydiscretemonauralsignal.nAmotaatueneicbthetisitcuderhtfonoenbiamece componentthatoccurswhenM/Sstereoissummedtomono. ThenewdualmodeMS38DMandMS380TXreectcontinuingdevelopmentofthepotentials  ofMS.erusethacdbeefp83SMldedivortaikhtoc-rsniidWpresdeaeoftheoriginanietnrtaoianlsu poratedinthenewgenerationofdualmodeunits.calippaewNsusahcussnoitSchanneingthelofr additionalcrowdresponseheardonlybythestereoaudiencearebeingdeveloped.srceunonaehT( microphoneisfedtotheMchannelandthecrowdresponsemicrophoneintotheSchannel.)Asimilar  trickcanbedonewitharticalreverbtocontroltherelativereverbbalanceforthemonoandthestereo  listeners. temsyshemistefoiclpMS/tehinpreThirtaocxnibm-� ingofaforward-facingmicrophone(theM,mid,ormono  signal)withalaterally-orientedbi-directionalmicrophone  (theS,side,orstereosignal).Oftenthesearestereomicro-phoneswithremotepatterncontroloftheMchannel,for  enhancedexibility. TheMpickupprovidesthecentralsoundimage,  andisthediscretemonauralsignal.TheSpickupprovides  thestereodirectionalinformation.bothncepondresiniS differentwaystotheambientorreverberantinformation  present,thisisthebasisforMSstereosuniqueabilityto  properlyreducetheambientcomponentformonolisteners  �  andincreaseitforthestereoaudience.  TheMandtheSsignalsarecombinedinasum-and-differencematrix(M+SandM-S)toproduceconventional  stereo(LeftandRight)signals.Thismaosoteretxirtgni Figure1 canbedoneeitheroriginallyorduringpostproduction.  
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Theversatilityofthetechniqueisthattheusermayadjustthestereoimageasneeded.reporpyB placementandselectionofthepolarpatternoftheMmicrophone,thediscretemonauralsignalcanbe  optimized.by,enThtmusdjafotnetletaehrbalaiveoftncegemaieoermtsitumnpo,sagnalSsi-to-heM canbecreated.emassasiehtreeltsunomoth,dldetoegisofereoimathisstnehWauidcshtemnoeret ralpickup.M=]S)+M([2/1-M(+)S TheMS38DMandMS380TXprovidehighaccuracydecoding(matrixing)oftheMandS  signalswithsingle-knobcontrolofthestereowidth.adoubltionsaseLReodmIthntincnufhteusi matrixandwillprovidestereowidthcontrolforconventionalmaterialintheLeftRightformat.Previ ouslyunobtainable,postproductioncontrolofthestereoimageisnoweasilyaccomplished.
AdditionalinformationconcerningtheM/Sstereotechniquecanbefoundinthepaper:M-SSet reo:nichequfuerTelgniSnIrofkroWotereAPwoEnodiAuethfognireenigishepublnrlaJuotehdni Society,,cOoteb,r9128.0,1p.p07718-7.loV,03.oNThispaperwas:yethniogolthanoslasidedulcni StereophonicTechniques,py.gSocietenignireiduAnEoybethliubedsh
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