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Preface
xi
inpresenceofaturbulentnoiseduetohighairflowaswellascontrolofhigher-
orderacousticmodesarefinallyreferencedto.
Chapter5concernspersonalactivecontrolsystems.Twotestapplications
areconsidered-activeheadsetandactivephone.Itisjustifiedthatanalogue
approachtocontrolallowsforefficientreductionofbroadbandindustrialandroad
noise.However,thephoneapplicationrequiresadditionallyshiftingthezoneof
quiettoreachtheuserseardrumforhigher-frequencycomponents.Inturn,for
noise,whichincludesadominatingtonalcomponent,theanaloguecontrolcanbe
supplementedwithanadaptivediscretecontrol
Chapter6isdevotedtodesigningaminiaturepersonalactivenoisereducing
systemwithenhancedcommunicationfeatures.Itisdedicatedmainlyto
environments,whereotheractivesolutionscannotbeappliedduetotechnological,
ergonomicalorhygienicreasons.Adiscretefixed-parametercontrolsystem
allowingforcontrolofnon-stationarynoiseisproposed.Speechsignalisrecorded
withanin-earmicrophoneandthenitsqualityisenhanced.Communicationwith
otherusersisalsodiscussed.
InChapter7themonographissummarisedandconclusionsaredrawn.
References,Listoffiguresandtables,Glossary,andIndexarealsoprovided.
DECLARATION
Theauthorwhenpreparingthemonographhasbenefitedfromarichsetof
publicationsonactivenoisecontrol,signalprocessingandcontroltheory.Hehas
closelycooperatedwithhisPh.D.andM.Sc.students,andothercolleagues
involvedinhisprojects.Appropriatereferencestopublishedworksand
unpublisheddocumentsindisposaloftheauthorareprovided.Remaining
derivationsandconclusionsare,tothebestknowledge,resultsoftheauthor’sown
research.
