audeo forensics

audeo forensics anedi dhwani recordingla samuparjana, vislaeshanha mariyu muulyaankanaaniki sambandhinchina forensic sains rangam, idhi chivariki nyaayasthaanamlo ledhaa itara adhikaarika vedikalo aamodayogyamaina saakshyamgaa samarpinchabadutundi.
audeo forensic sakshyam chatta amalu dwara naera parisoedhana nundi ledhaa pramaadam, mosam, apavaadu aaropanalu ledhaa edainaa itara poura sanghatanapai adhikaarika vichaaranalo bhaagamgaa raavacchu.
audeo forensics yokka praathamika amsaalu audeo sakshyam yokka "praamaanikatanu" sthaapinchadam, prasangam telivitaetalu mariyu takkuva sthaayi sabdaala shravana saamarthyaanni meruguparachadaaniki audeo recordingla "merugudala" cheyadam, mariyu matladevarini gurtinchadam, sambhaashanhanu lipyantareekarinchadam, mariyu naera ledhaa pramaada drushyaalu mariyu samayapalananu punarnirminchadam vanti sonic sakshyalanu "ardham chesukovadam mariyu document cheyadam".
aadhunika audeo forensics digital signal prosessingnu vistrutamgaa upayogistundi, gatamlo analog filterla vadakam ippudu vaadukalo ledhu. anukuula vadapotha mariyu vivikta forier parivartanalu vanti paddhatulu vistrutamgaa upayoginchabadutunnaayi. audeo forensic paddhatulalo iteevali purogatilo vois biometrics mariyu electrical network frequency vislaeshanha unnaayi.
charitra.
forensic audeo vislaeshanha chese avakaasam recording studio sarihaddula velupala chesina audeo recordingla labhyatapai aadharapadi untundi. modati portable magnetic tape recorderlu v kanipinchaayi mariyu tvaralo eee parikaraalanu interviewlu mariyu wire tapla rahasya recordinglanu pondadaaniki, alaage vichaaranalanu record cheyadaaniki upayoginchaaru.
yuu loe forensic audeo techniclanu upayoginchina modati chattaparamaina kesu.ess. federal kortulu united states v. v jarigina mckiever kesu. modatisaarigaa, prativaadi palgonna sambhaashana yokka chattaparamaina aamodayogyatanu nirnayinchamani mckiever kesulo nyaayamuurtini koraru.
us federal beuro off investigation (fbi) 1960la praarambhamlo audeo forensic vislaeshanha mariyu audeo merugudalalanu amalu cheyadam praarambhinchindi.
audeo forensic rangam pradhanamgaa pradhanamgaa watergate kumbhakonam samayamlo sthaapinchabadindi. adhyakshudu nixon yokka watergate tepulalo antaraalanu parisoedhinchadaaniki oka federal kortu audeo injaneerla pyaanelnu niyaminchindi, ivi rahasya recordinglu.ess. adhyakshudu richard nixon padaviloe unnappudu chesaaru. oka keelaka tape yokka tommidi ververu vibhagalu tolaginchabadindani probe kanugondi. ayaskanta tapenu vislaeshimchadaaniki kotta paddhatulaku eee nivedika daariteesindi.
praamaanikata.
digital audeo recording praamaanikata moolyaankanam kosam aneka savaallanu parichayam cheyavachu. digital audeo recordingla praamaanikata vislaeshanha recording prakriya samayamlo recordinglo migilipoyina jadalapai mariyu itara tadupari editing karyakalapalapai aadharapadi untundi. vislaeshanha yokka modati lakshyam audeo recording nundi eee jaadalalo denini tirigi pondavacho gurtinchadam mariyu gurtinchadam mariyu vaati lakshanaalanu document cheyadam. rendava dasalo, recording savarinchabadindane parikalpanaku avi maddatu istaya ledhaa vyatirekistaya anie nirnayinchadaaniki tirigi pondagalige jaadala lakshanaalu vislaeshimchabadataayi.
audeo sakshyam yokka praamaanikatanu pondadaaniki pareekshakuniki aneka rakaala pariseelanalu avasaram, avih recording saamarthyaanni tanikhi cheyadam, recording formatt, document charitranu sameekshinchadam, mottam audeo vinadam.
digital audeo samagratanu access chese paddhatulanu rendu pradhana vargaluga vibhajinchavachhuh 
container vislaeshanha.
container vislaeshanhaloo haash ganana, maak mariyu file formatt vislaeshanha untaayi.
vishayaala vislaeshanha.
content vislaeshanha anedi digital forensic vislaeshanha prakriyaloo kendra bhaagam mariyu idhi taarumaaru mariyu anty forensic prosessing karyakalapala jadalanu kanugonadaaniki audeo file yokka content aadhaaramgaa untundi. content aadhaarita audeo forensic paddhatulanu eee krindi vargalalo vibhajinchavachhuh
nf.
pradhana vyaasamh vidyut network frequency vislaeshanha
vidyut network frequency atyanta vishwasaneeyamaina mariyu balamaina audeo forensic vislaeshanhalaloo okati. 
anni digital recording parikaraalu 50 ledhaa 60 heartz vadda vidyut sarafara yokka prerita frequenseeki sunnitamgaa untaayi, idhi recordinglo gurtinchadagina taranga roopam santakaanni andistundi. transmission cables ledhaa mains-powered parikaraala sameepamlo upayoginchinappudu idhi pradhana saktitoe nadiche unitlu mariyu portable parikaraalu rendintikee vartistundi.
nf feature vector anedi 49-51 heartz shreni madhya byaand-paas filteringnu upayoginchi, audeo failnu resampling cheyakunda, nf taranga roopaanni asalu recording nundi vaeru cheyadaaniki pondabadutundi. recording yokka samagratanu niroopinchadaaniki ledhaa niroopinchadaaniki vidyut sarafaraadaaru andinchina databaseku vyatiraekamgaa phalitaalu plaat cheyabadataayi mariyu vislaeshimchabadataayi, tadwara vislaeshanhaloo padaartham yokka spashtamaina mariyu shaastreeya praamaaneekarananu andistundi.
dhwani paryaavaranam santakam.
pradhana vyaasamh dhwani santakam
audeo recording anedi saadhaaranamgaa pratyaksha vanarulu, paroksha sankethaalu ledhaa pratibimbaalu, dviteeya vanarulu mariyu parisara sabdam vanti bahula dhwani sankethaala kalayika. paroksha sankethaalu, dviteeya vanarulu mariyu parisara sabdam oka dhwani vaataavaranaanni vargeekarinchadaaniki upayoginchabadataayi. audeo recording nundi dhwani suuchanalanu bahirgatam cheyadam kashtamaina pani.
dynamic ecoustic environment identification (eah. ii. ii) nii pratidhvani mariyu nepathya sabdam yokka anchanaanu upayoginchi lekkinchavacchu.
audeo merugudala.
audeo enhancement anedi oka forensic prakriya, idhi ardham kaani recording nundi avaanchita sabdaanni tolaginchadam mariyu subhraparachadam dwara audeo file telivitaetalanu meruguparachadam lakshyamgaa pettukundi.
forensic saastravettalu audeo failuloo unna asalu samacharanni prabhaavitam cheyakunda eee sabdaalanu tolaginchadaaniki prayatnistaaru. merugudala anedi failu yokka merugaina avagahananu pondadaaniki anumatistundi, idhi neeramloo oka vyakti yokka bhagaswamyanni nirnayinchadaaniki keelakam kaavacchu ledhaa kaadu.
shabda merugudala vislaeshanha yokka pradhana amsam sabdam samasyalanu gurtinchadam mariyu asalu file nundi daanni velikiteeyadam. vaastavaaniki, sabdam edho oka vidhamgaa riverse-injaneerd cheyagaligithe, daanini upayoginchukovachhu mariyu daani tadupari tolagimpu ledhaa attenuation kosam anumatinchadaaniki parisoedhinchavachchu. 
forensic audeo merugudala yokka lakshyalu
audeo merugudala prakriya yokka modati dasha klishtamaina vinadamh dhwani forensic vyuuhaanni roopondinchadaaniki puurti recording sameekshinchabadutundi. audeo recording yokka clonelanu srushtinchadam chaalaa avasaram, endukante asalu failnu kaligi undataaniki mariyu daanitoe polchagaligela master recordinglo pani eppuduu nirvahinchabadadu. puurti merugudala prakriya antataa, asalu, proses cheyani recordingku vyatiraekamgaa nirantaram suuchimchabadutumdi, tadwara vichaaranalo taruvaata levanette edainaa ovar-prosessing mariyu prii-empting samasyalanu nivaaristundi. maargadarsakaalu mariyu pani vidhaanaalanu anusarinchadam valla ververu nipunudu adhe prosessingnu upayoginchi adhe phalitaalanu saadhinchadaaniki veelu kalpistundi. 
manam jokyam chesukune dhwanini rendu vargaluga vibhajinchavachhuh sthiramaina sabdam ledhaa samaya-vaividhyamaina sabdam. 
sthiramaina sabdam nirantara sabdam, humble, rumble ledhaa hiss vanti sthiramaina paatranu kaligi untundi. sthiramaina sabdam 100 heartz kante takkuva frequency paridhiloo sthiramaina rambultho prasangam recording vanti aasakti sankethaalaku bhinnamgaa unde frequency paridhini aakramistundani anukundam. aaa sandarbhamlo, daadaapu speach bandwidthnu paas cheyadaaniki bandpass filter vanti sthira vadapotanu vartimpajeyadam saadhyamavutundi. saadhaaranamgaa speach bandwidth 250 heartz nundi 4 kehechz varaku untundi. okavela sthiramaina sabdam bandwidth kaavalasina signal yokka adhe frequency paridhini aakraminchinatlayithe, saadhaarana vibhajana vadapotha sahaayapadadu. ayithe, kaavalasina signal yokka sraavyata/avagahananu meruguparachadaaniki samaanatvaanni vartimpajeyadam ippatikee saadhyame.
samaya-vaividhya shabda muulaalaku saadhaaranamgaa sthiramaina shabda muulaala kante marinta sanklishtamaina prosessing avasaram mariyu tarachugaa samarthavantamgaa anachiveyabadavu.
merugudala paddhati.
audeo merugudala anedi time-domine, automatic geyin controll, mariyu frequency-domine paddhatulu, frequency selective filterlu mariyu spectral vyavakalanam rendinti dwara grahinchabadutundi.
svayamchaalaka labham niyantrana.
time-domine merugudalalo saadhaaranamgaa record cheyabadina audeo signal yokka amplitude envalapnu saadhaaraneekarinchadaaniki geyin sardubaatlu untaayi. saadhaaranamgaa playback samayamlo sthiramaina dhwani sthaayini cherukovadaniki prayatninche automatic geyin controll technic ledhaa geyin compression/expansion technic upayoginchabadutundih recordingloni sabdaaniki matrame suuchimchadagina bhagalu nissabdamgaa cheyabadataayi, takkuva-amplitude signal margalu vistarinchabadataayi mariyu biggaraga margalu ksheeninchabadataayi ledhaa ontarigaa vadiliveyabadataayi.
sabdam chese signal meeda sabdam chese dwaaram ledhaa squelch prakriyanu vartimpajeyadam oka saadhaarana vidhanam. sabdam dwaranni eee prayojanam kosam roopondinchina electronic parikaramgaa grahinchavacchu ledhaa idhi computertho proses cheyadaaniki software kaavacchu. sabdam dwaaram daani input signal yokka swalpakaalika sthaayini mundugaa nirnayinchina sthaayi parimititoe polchi chustundi. signal sthaayi pravesha sthaayi kante ekkuvagaa unte, gate teruchukuntundi, signal gundaa vellanivvabadutundi, lekapothe signal sthaayi pravaesaaniki diguvana unte, gate moosiveyabadutundi mariyu signal paas cheyadaaniki anumatinchabadadu. nissabda bhagalalo sambhavinche sabdam sanketam nirodhinchabadinappudu prasangam gate gundaa vellagaligelaa pravesha sthaayini sardubaatu cheyadam pareekshakula paatra. sambhaashanhalo viramam samayamlo nepathya sabdam aapiveyabadinanduna takkuva sabdam anie bhaavinche signalnu ardham chesukovadaniki sabdam dwaaram shrotaku sahaayapadutundi. ayithe, daani saralamaina samskaranalo sabdam dwaaram sabdam sthaayini tagginchadu mariyu rendoo oke samayamlo unnappudu mariyu dwaaram terichi unnappudu ekakaalamlo signalnu penchadu.
appudu vividha frequency bandlalo gating vibajananu amalu cheyadaaniki konni digital signal prosessing paddhatulanu sadviniyogam chesukune marinta adhunaatana shabda gate vyavasthalu kooda unnaayi. eee adhunaatana vyavasthalu audeo recordinglo unna nirdishta rakaala sabdaanni mariyu athani sabdaanni tolaginchadaaniki pareekshakuniki sahaayapadataayi.
frequency-selective filterlu.
frequency-selective filterlu anedi frequency domainlo panichese oka saanketikata. eee saanketikata venuka unna suutram emitante, spectramlo shakti-sambandhita humm mariyu buzz signals vanti tonal bhaagaalanu empika cheyadam dwara recording naanhyatanu meruguparachadam. multy-byaand audeo equalizer vadakam kooda, speach frequency paridhi vanti aasakti gala frequency byaandnu nilupukuntuu, avt-off-byaand sabdaanni tagginchadamlo sahaayapadutundi.
varnapata vyavakalanam.
spectral vyavakalanam anedi digital signal prosessing technic, dheenilo swalpakaalika sabdam spectrum oka frame nundi anchanaa veyabadutundi, aapai sabdam input signal yokka chinna framela spectrum nundi teesiveyabadutundi. avtput signal yokka sabdam-taggina framenu punarnirminchadaaniki vyavakalanam tarvaata pondina spectrum upayoginchabadutundi. ativyaapti-jodimpu vidhanam dwara mottam avtput signalnu srushtinchadaaniki tadupari framela kosam prakriya konasaagutundi.
varnapata vyavakalanam yokka prabhavam sabdam varnapataanni anchanaa vese saamardhyampai aadharapadi untundi. rikaardu cheyabadina sambhaashanhalo vaakyaala madhya viramam vanti nepathya sabdam matrame kaligi unna input signal frame nundi saadhaaranamgaa anchanaa pondabadutundi. atyanta adhunaatana shabda taggimpu paddhatulu time domainlo sthaayini gurtinchadam mariyu frequency domainlo spectral vyavakalanam yokka bhaavanalanu militam chestaayi. adanapu signal namuunaalu mariyu niyamaalu sanketha bhaagaalanu vaeru cheyadaaniki upayoginchabadataayi, ivi ekkuvagaa kaavalasina sankethamlo bhaagamgaa untaayi, ivi sankalanaatmaka sabdam kaavacchu.
vivarana.
dhruvikarana mariyu merugudala taruvaata, tanikhi chesina audeo failnu moolyaankanam chesi, parisoedhanaku daani praamukhyatanu nirnayinchadaaniki ardham chesukovali.
udaaharanaku, prasangam recording vishayamlo dheeni ardham audeo content yokka transcription siddham cheyadam, matladevarini gurtinchadam, nepathya sabdaalanu ardham chesukovadam modalainavi.
modalainavi, yuu. ess. national academy off sciences (naasa) united stateslo forensic sainsnu balopetam cheyadamh munduku saage maargam anae sheershikato oka nivedikanu prachurinchindi. saampradayakamgaa aatmaasraya vislaeshanha mariyu polikapai aadhaarapadina audeo forensic sahaa forensic sains yokka aneka rangaalapai eee nivedika chaalaa vimarsanaatmakamgaa undhi. 
forensic saakshyaala praamukhyata mariyu viswasaneeyata anedi daryaaptuku vividha rakaala sahakaralapai aadharapadi untundi. kontha sthaayi anischiti daadaapu ellappuduu untundi, endukante saadhaaranamgaa audeo forensic sakshyalu lakshya mariyu aatmaasraya parigananalatho ardham chesukobadatayi. 
shaastreeya adhyayanamlo anischitini konni suuchikalatoe kolavavacchu, mariyu konasagutunna vislaeshanha bhavishyattulo adanapu antardrushtulanu andinchavacchu, forensic pareeksha saadhaaranamgaa konasagutunna sameekshaku lobadi undadu. kesu vichaarana samayamlo teerpu ivvaalsina avasaram undhi, kabatti kortu vividha saakshyaala mukkalanu anchanaa veyali mariyu yea sthaayi sandeham unnaa anchanaa veyali. 

