deferential coding

digital ashayavinimayangalil, chila tharatthilulla modulation upayogikkumbol "avyakthamaaya" signal sweekaranam nalkaan upayogikkunna oru saankethikavidyayaanu deferential coding. nilavile signal avasthaye (allengil chihnam) mathramalla, munbathethu aashrayich daatta kaimarunnu.
deferential coding aavasyamulla saadhaarana tharam modulationukalil phase-shift keying, quadrature amplitude modulation enniva ulppedunnu.
deferential kodinginte uddeshyangal.
santhulithamaaya lainukaliloode daatta kaimaarumbol, traansmittarum reseaver thammilulla kebilile dhruveeyatha abadhathil vipareethamaakkunnath eluppamaanu.
athupole thanne bii. pii. ezz. keyilum. bpske demodulate cheiyunnathinu, oraal oru praadeshika oosilettar remotumaayi "samanvayippikkendathund". oru carrier recovery surcuted vazhiyaan ithu saadhyamaakkunnath. ennirunnaalum, veendedutha kaariyarinte poornnasankhya bhagam avyakthamaanu. rund oosilettarukalkkidayil saadhuthayullathum ennaal thulyamallaathathumaaya ghatta shifttukal undu. bpsk-nuu, "n" = 2; chinnangal vipareethamaayi kaanappedunnundo illayo.
deferential encoding signalinteyum chinnangaludeyum vipareethathe yathaakramam daattaye baadikkunnathil ninnu thadayunnu.
formula _ 1 traansmissionaayi uddeshichittulla oru bitt aanennum formula _ 2 aanu ippol traansmit cheytha chihnamennum karuthuka, appol formula _ 1-naayi traansmit cheyyenda chihnam
ivide formula _ 4 bainari allengil modulo-2 kootticherkkal soochippikkunnu. decoding vashath, formula _ 1 veendedukkunnu
athaayath, formula _ 1 chinnangalude formula _ 7 umm formula _ 2 umm thammilulla vyathyaasathe maathram aasrayichirikkunnu, allathe avayude moolyangaleyalla (vipareethamo allayo).
dhruveeyatha samvedanakshamathayillaathayi roopakalppana cheythittulla niravadhi vyathyastha line kodukal undu-dattaa stream vipareethamaanengilum allengilum, decode cheytha daatta ellaayppozhum sariyaayirikkum.
deferential maanchastar encoding, bipolar encoding, enrc, biphace maarkk coode, coode cheytha maarkk inversion, mlt-3 encoding enniva eee propertyulla line kodukalil ulppedunnu.
parambaraagatha deferential coding.
mukalil chithreekaricha oru reethikk oru dattaa stream inversion kaikaaryam cheyyaan kazhiyum (ithine "180° avyakthatha" ennu vilikkunnu). chilappol athu mathiyakum (udha.jii. bpske upayogikkukayaanenkil allengil mattu avyakthathakal mattu sarcuteukal kandethukayaanengil, udaaharanathinu oru vittarbi decoder allengil frame synchronizer) chilappol athu anganeyalla.
pothuvaayi paranjaal, oru "deferential coding" "chinnangalkk" baadhakamaan (iva modulettaril upayogikkunna athe chinnangal aavasyamilla). 180° avyakthatha" pariharikkunnathin, bittukal eee chinnangalaayi upayogikkunnu. 90° avyakthatha" kaikaaryam cheyyumbol, jody bittukal upayogikkunnu, koodaathe "45° avyakthatha" pariharikkan moonniratti bittukal upayogikkunnu (udha.jii. 8 pii. ezz. keey.).
oru "deferential encoder" () ooppareshan nalkunnu, oru "deferential decoder"-() ooppareshan.
deferential encoder deferential decoder vyathirikthamaya leanier time-invariyant sistangalaanu. aadyathethu aavarthanaparavum randaamathethu aavarthanaparamallathathum athinaal phir aanu. avaa digital filterukalaayi vishakalanam cheyyaan kazhiyum.
oru "deferential encoder" oru analog integratorinu samaanamaan. athinu oru aavegaparamaaya prathikaranamundu
oru transfer function
oru "deferential decoder" oru analog deferentiatinu samaanamaan, athinte impulse prathikaranam
athinte kaimatta pravartthanavum
bainari (modulo-2) ganithathil, kootticherkkalum kuravum (positteev, negatteevu samkhyakal) thulyamaanennu shradhikkuka.
saamaanyavalkkaricha deferential coding.
relation formula _ 13 upayogikkunnathu deferential encoding nadathunnathinulla eaka margamalla. kooduthal pothuve, ithu eathu function formula aakam, oru samavaakya formulakku _ 15 nuu eathu formulakkum _ 16, formula _ 17 ennivaykku oreyoru parihaarameyulloo.
aaplikkeshanukal.
pii. ezz. keey, kaam moduleshanukalkkoppam saattalait, radio rile ashayavinimayangalil deferential coding vyaapakamaayi upayogikkunnu.
poraaymakal.
deferential codinginu oru pradhana poraaymayundu ithu pishak gunanathilekku nayikkunnu. athaayath, formula _ 7 polulla oru chihnam thettayi labhichaal, formula _ 19, formula _ 20 ennee rund thettaaya chinnangal deferential decoderinte aouttputtil undaakum, kaanuka
formula _ 21 umm formula _ 22 umm. ithu signal-tuu-noys anupaathathil berine ekadesham erattiyaakkunnu, ithinaayi thudarchayaaya chinnangalil pishakukal apoorvvamaayi maathrame sambhavikkoo.
oru ghattatthile avyakthatha pariharikkunnathinulla mattu saankethikavidyakal.
oru ghattatthile avyakthatha kaikaaryam cheyyaanulla eaka maarggam deferential coding allah. eee aavashyathinaayi "sinkwedukal" upayogikkuka ennathaanu mattoru janapriya saankethikavidya. athaayath, oru "frame synchronizer" aavarthichulla vipareeta samanvayam-vaakkukal kandethukayaanengil, athu muzhuvan streamin vipareethamaakkunnu. eee reethi dvb-esilaanu upayogikkunnathu.

