/Users/andrea/_magisterarbeit/korpus/clean/testkorpus/30/file1.html NN ----------------------------------------- : Signal NP information NN theory NN From IN Wikipedia NP , , the DT free JJ encyclopedia NN . SENT Jump VV to TO . SENT navigation NN , , search NN In IN information NN theory NN , , a DT signal NN is VBZ a DT flow NN of IN information NN . SENT Most JJS signals NNS of IN interest NN can MD be VB modeled VVN as IN functions NNS of IN time NN or CC position NN . SENT The DT domain NN of IN a DT function NN can MD be VB a DT scalar NN or CC a DT vector NN . SENT Likewise RB , , the DT range NN can MD be VB scalar JJ or CC vector NN , , with IN either DT real JJ or CC complex JJ values NNS . SENT Contents NNS 1 CD Analog NP and CC digital JJ signals NNS 1 CD . SENT 1 CD Discretization NP 1 CD . SENT 2 CD Quantization NN 2 CD Examples NNS of IN signals NNS 3 CD Frequency NN analysis NN 4 CD Entropy NN 5 CD See NP also RB edit VV Analog NP and CC digital JJ signals NNS The DT two CD main JJ types NNS of IN signals NNS are VBP analog JJ and CC digital JJ . SENT In IN short RB , , the DT difference NN between IN them PP is VBZ that IN digital JJ signals NNS are VBP discrete JJ and CC quantized VVN , , as RB defined VVN below IN , , while IN analog JJ signals NNS possess VVP neither DT property NN . SENT edit VV Discretization NP Main NP article NN . SENT Discrete JJ signal NN One NN of IN the DT fundamental JJ distinctions NNS between IN different JJ types NNS of IN signals NNS is VBZ between IN continuous JJ and CC discrete JJ time NN . SENT In IN the DT mathematical JJ abstraction NN , , the DT domain NN of IN a DT continuous JJ time NN CT NP signal NN is VBZ the DT set NN of IN real JJ numbers NNS or CC some DT interval NN thereof RB , , whereas IN the DT domain NN of IN a DT discrete JJ time NN signal NN is VBZ the DT set NN of IN integers NNS or CC some DT interval NN . SENT What WP these DT integers NNS represent VVP depends VVZ on IN the DT nature NN of IN the DT signal NN . SENT DT NP signals VVZ often RB arise VV via IN of IN CT NP signals NNS . SENT For IN instance NN , , sensors NNS output NN data NNS continuously RB , , but CC since IN a DT continuous JJ stream NN is VBZ impossible JJ to TO record NN , , a DT discrete JJ signal NN is VBZ used VVN as IN an DT approximation NN . SENT Computers NNS and CC other JJ digital JJ devices NNS are VBP restricted VVN to TO discrete JJ time NN . SENT edit VV Quantization NN Main JJ article NN . SENT Quantization NN signal NN processing NN If IN a DT signal NN is VBZ to TO be VB represented VVN as IN a DT sequence NN of IN numbers NNS , , it PP is VBZ impossible JJ to TO maintain VV arbitrarily RB high JJ precision NN each DT number NN in IN the DT sequence NN must MD have VH a DT finite JJ number NN of IN digits NNS . SENT As IN a DT result NN , , the DT values NNS of IN such PDT a DT signal NN are VBP restricted VVN to TO belong VV to TO a DT finite JJ set NN . SENT in IN other JJ words NNS , , it PP is VBZ quantized VVN . SENT edit VV Examples NNS of IN signals NNS Motion NP . SENT One PP can MD conceive VV of IN a DT signal NN representing VVG the DT motion NN of IN a DT particle NN say VVP , , a DT mote NN of IN dust NN , , through IN some DT suitable JJ space NN . SENT The DT domain NN of IN a DT motion NN signal NN is VBZ one CD dimensional JJ time NN , , and CC the DT range NN is VBZ generally RB three CD dimensional JJ . SENT Sound NN . SENT Since IN a DT sound NN is VBZ a DT vibration NN of IN a DT medium NN such JJ as IN air NN , , a DT sound JJ signal NN associates NNS a DT pressure NN value NN to TO every DT value NN of IN time NN . SENT In IN the DT real JJ world NN , , sound JJ signals NNS are VBP analog JJ . SENT Compact JJ discs NNS CDs NNS . SENT CDs NNS contain VVP discrete JJ signals NNS representing VVG sound NN , , recorded VVN at IN 44 CD , , 100 CD samples NNS per IN second JJ . SENT Each DT sample NN contains VVZ data NNS for IN a DT left JJ and CC right JJ channel NN since IN CDs NNS are VBP recorded VVN in IN stereo NN . SENT Pictures NPS . SENT An DT picture NN assigns VVZ a DT color NN value NN to TO each DT of IN a DT set NN of IN points NNS . SENT Since IN the DT points NNS lie VVP on IN a DT plane NN , , the DT domain NN is VBZ two CD dimensional JJ . SENT If IN the DT picture NN is VBZ a DT physical JJ object NN , , such JJ as IN a DT painting NN , , it's NN a DT continuous JJ signal NN . SENT If IN the DT picture NN a DT digital JJ image NN , , it's NN a DT discrete JJ signal NN . SENT It's NP often RB convenient JJ to TO represent VV color NN as IN the DT sum NN of IN the DT intensities NNS of IN three CD primary JJ colors NNS , , so RB that IN the DT signal NN is VBZ vector NN valued VVN with IN dimension NN three CD . SENT Videos NNS . SENT A DT video NN is VBZ a DT series NN of IN images NNS . SENT A DT point NN in IN a DT video NN is VBZ identified VVN by IN its PP$ position NN two CD dimensional JJ and CC by IN the DT time NN at IN which WDT it PP occurs VVZ , , so RB a DT video JJ signal NN has VHZ a DT three CD dimensional JJ domain NN . SENT Biological JJ membrane NN potentials NNS . SENT The DT value NN of IN the DT signal NN is VBZ a DT straightforward JJ electric JJ potential JJ voltage NN . SENT The DT domain NN is VBZ more RBR difficult JJ to TO establish VV . SENT Some DT cells NNS or CC organelles NNS have VHP the DT same JJ membrane NN potential NN throughout IN . SENT neurons NNS generally RB have VHP different JJ potentials NNS at IN different JJ points NNS . SENT These DT signals NNS have VHP very RB low JJ energies NNS , , but CC they PP can MD be VB measured VVN in IN aggregate NN by IN the DT techniques NNS of IN electrophysiology NN . SENT edit VV Frequency NN analysis NN Main JJ article NN . SENT Frequency NN domain NN It PP is VBZ remarkably RB useful JJ to TO analyze VV the DT frequency NN spectrum NN of IN a DT signal NN . SENT This DT technique NN is VBZ applicable JJ to TO all DT signals NNS , , both CC continuous JJ and CC discrete JJ . SENT For IN instance NN , , if IN a DT signal NN is VBZ passed VVN through IN an DT LTI NP system NN , , the DT frequency NN spectrum NN of IN the DT resulting VVG output NN signal NN is VBZ the DT product NN of IN the DT frequency NN spectrum NN of IN the DT original JJ input NN signal NN and CC the DT frequency NN response NN of IN the DT system NN . SENT edit VV Entropy NN Another DT important JJ propery NN of IN a DT signal NN actually RB , , of IN a DT statistically RB defined VVN class NN of IN signals NNS is VBZ its PP$ entropy NN or CC information NN content NN . SENT edit VV See VV also RB Signal NP noise NN Signal NP to TO noise NN ratio NN Signal NP processing NN Digital NP signal NN processing NN Image NN processing VVG Digital NP image NN processing NN Retrieved VVN from IN http NN . SENT en FW . SENT wikipedia NN . SENT org NP wiki NP Signal NP 28 CD information NN theory NN 29 CD Categories NNS . SENT Digital NP signal NN processing NN Signal NP processing NN Views NNS ArticleDiscussionEdit NN this DT pageHistory JJ Personal JJ tools NNS Sign VV in IN create VV account NN Navigation NP Main NP PageCommunity NP PortalCurrent NP eventsRecent JJ changesRandom NN articleHelpContact NN usDonations NNS Search NP Toolbox NP What WP links VVZ here RB Related JJ changes NNS Upload NN file VVP Special JJ pages NNS Printable JJ version NN Permanent JJ link NN In IN other JJ languages NNS Italiano NP Sloven NN ina NP This DT page NN was VBD last RB modified VVN 09 CD . SENT 17 CD , , 11 CD November NP 2005 CD . SENT All DT text NN is VBZ available JJ under IN the DT terms NNS of IN the DT GNU NN Free JJ Documentation NN License NN see VVP Copyrights NNS for IN details NNS . SENT Privacy NN policy NN About IN Wikipedia NP Disclaimers NNS