{"id":99675,"date":"2021-04-06T22:22:41","date_gmt":"2021-04-06T20:22:42","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/google-opublikoval-audiokodek-lyra-dlya-peredachi-rechi-pri-plohom-kachestve-svyazi"},"modified":"2021-04-06T22:22:41","modified_gmt":"2021-04-06T20:22:42","slug":"google-opublikoval-audiokodek-lyra-dlya-peredachi-rechi-pri-plohom-kachestve-svyazi","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/news\/google-opublikoval-audiokodek-lyra-dlya-peredachi-rechi-pri-plohom-kachestve-svyazi","title":{"rendered":"Google je objavio audio kodek Lyra za prijenos govora u uvjetima lo\u0161e povezanosti","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Tvrtka Google predstavila je novi audio kodek Lyra, optimiziran za postizanje maksimalne kvalitete prijenosa govora \u010dak i pri kori\u0161tenju veoma sporih komunikacijskih kanala. K\u00f4d implementacije Lyra napisan je na C++ i otvoren je pod licencom Apache 2.0, no me\u0111u potrebnim ovisnostima za rad nalazi se proprietarna biblioteka libsparse_inference.so koja implementira jezgru za matemati\u010dke izra\u010dune. Nagla\u0161ava se da je proprietarna biblioteka privremena \u2014 u budu\u0107nosti Google obe\u0107ava razviti otvorenu zamjenu i osigurati podr\u0161ku za razli\u010dite platforme. <\/p>\n

U kvaliteti prijenosa glasovnih podataka na niskim brzinama, Lyra znatno nadma\u0161uje tradicionalne kodeke koji koriste metode digitalne obrade signala. Kako bi se postigla visoka kvaliteta prijenosa govora u uvjetima ograni\u010denog volumena prenesenih informacija, pored uobi\u010dajenih metoda kompresije zvuka i pretvorbe signala, u Lyra se koristi jezi\u010dni model baziran na sustavu strojno u\u010denja, koji omogu\u0107uje rekonstrukciju nedostaju\u0107i informacija na temelju tipi\u010dnih karakteristika govora. Model kori\u0161ten za generiranje zvuka obu\u010den je koriste\u0107i nekoliko tisu\u0107a sati snimaka glasova na vi\u0161e od 70 jezika.

\"Google<\/center> <\/p>\n

Kodek uklju\u010duje kodera i dekoder. Algoritam rada kodera svodi se na izvla\u010denje parametara glasovnih podataka svakih 40 milisekundi, njihovu kompresiju i prijenos primatelju putem mre\u017ee. Za prijenos podataka dovoljna je komunikacijska veza brzine 3 kilobita u sekundi. Izva\u0111eni zvu\u010dni parametri uklju\u010duju logaritamske mel-spektrograma, koji uzimaju u obzir karakteristike energije govora u razli\u010ditim frekvencijskim rasponima i pripremljeni su uzimaju\u0107i u obzir model ljudskog sluha.

\"Google<\/center> <\/p>\n

U dekoderu se koristi generativni model koji na temelju primljenih zvu\u010dnih parametara rekreira signal sa govorom. Kako bi se smanjila slo\u017eenost izra\u010duna, primijenjen je lagani model temeljen na rekurentnoj neuronskoj mre\u017ei, koja je varijanta modela sinteze govora WaveRNN, u kojem se koristi ni\u017ea frekvencija uzorkovanja, ali se paralelno generira nekoliko signala u razli\u010ditim frekvencijskim opsezima. Dobiveni signali se potom preklapaju kako bi se dobio jedinstveni izlazni signal koji odgovara zadanoj frekvenciji uzorkovanja. <\/p>\n

Za ubrzanje su tako\u0111er primijenjene specijalizirane procesorske instrukcije dostupne na 64-bitnim ARM procesorima. Kao rezultat, unato\u010d upotrebi strojnog u\u010denja, codec Lyra mo\u017ee se koristiti za kodiranje i dekodiranje govora u stvarnom vremenu na pametnim telefonima srednje cjenovne kategorije, pokazuju\u0107i ka\u0161njenje prijenosa signala na razini od 90 milisekundi.
\n
Izvor: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Google \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0430 \u043d\u043e\u0432\u044b\u0439 \u0430\u0443\u0434\u0438\u043e\u043a\u043e\u0434\u0435\u043a Lyra, \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u0434\u043b\u044f \u0434\u043e\u0441\u0442\u0438\u0436\u0435\u043d\u0438\u044f \u043c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0433\u043e \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0430 \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0438 \u0440\u0435\u0447\u0438 \u0434\u0430\u0436\u0435 \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u043e\u0447\u0435\u043d\u044c \u043c\u0435\u0434\u043b\u0435\u043d\u043d\u044b\u0445 \u043a\u0430\u043d\u0430\u043b\u043e\u0432 \u0441\u0432\u044f\u0437\u0438. \u041a\u043e\u0434 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 Lyra 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