sample-nirakk parivartthanam

sample-rettu parivartthanam, sample-freekwansi parivartthanam allengil resampling ennathu adisthaanamaaya thudarchayaaya signalinte puthiya vyathiriktha praathinidhyam nedunnathinaayi oru vyathiriktha signalinte sample nirakk allengil sample aavruthi mattunna prakriyayaan. aaplikkeshan mekhalakalil imej scaling, audiyo/vishwal sisttangal enniva ulppedunnu, avide enchiniyaring, saambathikam allengil charitraparamaaya kaaranangalal vyathyastha sample nirakkukal upayogikkaam.
udaaharanathinu, compact disk digital audiyo, digital audiyo tape samvidaanangal vyathyastha sample nirakkukal upayogikkunnu, american television, europian television, sinimakal ennivayellaam vyathyastha frame nirakkukal upayogikkunnu. sample-rettu parivartthanam vegathayilum pichilum undaakunna mattangal thadayunnu, allengil atharam samvidaanangalkkidayil record cheytha metteeriyal kaimaarumbol athu sambhavikkam.
kooduthal nirddishta tharam punarnirmmanangalil iva ulppedunnu "upsampling" allengil "upsampling"; "downsampling", "downscaling" allengil "desimation"; "interpolation".
multy-rettu digital signal prosessing enna padam chilappol sample-rettu parivartthanam ulkkollunna samvidaanangale soochippikkaan upayogikkunnu.
saankethikavidyakal.
sample-rettu parivarthanatthinulla aashayaparamaaya sameepanagalil iva ulppedunnu oru analog thudarchayaaya signalilekk parivartthanam cheyyuka, thudarnnu puthiya nirakkil veendum sample cheyyuka, allengil pazhaya saambilukalil ninnu nerittu puthiya saambilukalude moolyangal kanakkaakkuka. kuranja shabdavum valachodikkalum avatharippikkunnathinaal randaamathethu kooduthal thripthikaramaanu. saadhyamaaya rund nadappaakkal reethikal inipparayunnavayaanu
rund reethikalum ganithashaasthraparamaayi samaanamaan randaamathe schemil oru interpolation function thiranjedukkunnathu aadya schemile filterinte impulse prathikaranam thiranjedukkunnathinu thulyamaanu. leanier interpolation oru trikonaparamaaya impulse prathikaranatthinu thulyamaanu; windod sink oru ishtika-mathil filterine ekadeshamaayi kanakkakkunnu (pooyintukalude ennam vardhikkumbol ithu abhikaamyamaaya "ishtika mathil" filterine sameepikkunnu). reethi 1 leeii filterinte impulse prathikaranatthinte dairkhyam reethi 2 leeii interpolationil upayogikkunna pooyintukalude ennavumaayi poruthappedunnu.
reethi 1 ll, oru opttimal (oro aaplikkeshan aavasyakathakalkkum) filter design labhikkunnathin oru mandagathiyilulla pree-computing (remez algoritam polullava) upayogikkaam. reethi 2 kooduthal pothuvaaya kesukalil pravartthikkum, udha.jii. sample nirakkukalude anupatham yukthisahamallathatho rund thalsamaya streamukal ulkkollendatho allengil sample nirakkukal samayathil vyathyaasappettirikkunnathu aaya sthalangalil.
sample-rettu kanvershan filter design/nadappaakkal ennivayekkurichulla kooduthal vivarangalkk desimation upsampling kaanuka.
udaaharanagal.
sinimayum television.
apollo moonn dauthyangalil ninnulla slow-scan tivi signalukal veettile kaazhchakkaarkk parambaraagatha tivi nirakkukalayi parivartthanam cheythu. akkaalat digital interpolation skeemukal praayogikamayirunnilla, athinaal analog parivartthanam upayogichirunnu. apollo slow-scan chithrangal pradarshippikkunna oru monittar kaanunna oru tivi rettu camera adisthaanamaakkiyullathaanu ithu.
secondil 24 frameukalil chithreekaricha sinimakal televisionakki (secondil ekadesham 50 allengil 60 feeldukal) parivartthanam cheiyunnu. udaaharanathinu, oru 24 frame/second sinimaye 60 feeld/second televisionakki parivartthanam cheyyuka. paal polulla 50 hearts systengalkku oro frame randuthavana kaanikkunnu. 50 ennathu krithyamaayi 2x24 allaathathinaal, sinima 50/48 = 4 sathamaanam vegathil pravartthikkum, koodaathe audiyo pitch 4 sathamaanam kooduthalaayirikkum, ithu paal speed-upp ennariyappedunna oru efakttaanu. ithu palappozhum laalithyathinaayi amgeekarikkappedunnu, ennaal oodunna samayavum pichum samrakshikkunna kooduthal sankeernamaaya reethikal saadhyamaan. oro thavanayum randuthavana allengil digital interpolation (mukalil kaanuka) oru viidiyoo scalaril upayogikkaam.
audiyo.
compact diskile oodiyoykku 44.1 kiloherts sample rettu undu; 48 kiloherts upayogikkunna oru digital maadhyamathilekku ithu kaimaran, mukalilulla reethi 1 "l" = 160 ", m" = 147 upayogichu upayogikkaam (48000/44100 = 160/147 muthal). vipareeta parivarthanatthinaayi, "l", "m" ennivayude moolyangal maattunnu. mukalil paranjathupole, rund saahacharyangalilum, loow-paas filter 22.05 kz aayi sajjamaakkanam.
athum kaanuka.
onniladhikam alavukalil sample nirakk parivartthanam
sample-rettu parivartthanam ulppettekkaavunna saankethikavidyakalum prosessing
anubandha prakriyakalil upayogikkunna saankethikavidyakal

