{"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\/ro\/blog\/news\/google-opublikoval-audiokodek-lyra-dlya-peredachi-rechi-pri-plohom-kachestve-svyazi","title":{"rendered":"Google a publicat codec-ul audio Lyra pentru transmiterea vocii \u00een condi\u021bii de calitate slab\u0103 a conexiunii.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Compania Google a lansat un nou codec audio Lyra, optimizat pentru a oferi calitate maxim\u0103 \u00een transmisia vocii, chiar \u0219i \u00een condi\u021bii de band\u0103 larg\u0103 foarte redus\u0103. Implementarea lui Lyra este scris\u0103 \u00een C++ \u0219i este disponibil\u0103 sub licen\u021ba Apache 2.0, dar printre dependen\u021bele necesare pentru func\u021bionare se afl\u0103 o bibliotec\u0103 proprietar\u0103 libsparse_inference.so, care con\u021bine nucleul pentru calcule matematice. Se men\u021bioneaz\u0103 c\u0103 biblioteca proprietar\u0103 este temporar\u0103 - \u00een viitor, Google promite s\u0103 dezvolte o alternativ\u0103 deschis\u0103 \u0219i s\u0103 asigure suport pentru diferite platforme. <\/p>\n

\u00cen ceea ce prive\u0219te calitatea datelor vocale transmise la viteze reduse, Lyra dep\u0103\u0219e\u0219te semnificativ codecurile tradi\u021bionale care utilizeaz\u0103 metode de procesare digital\u0103 a semnalelor. Pentru a asigura o calitate ridicat\u0103 a transmisiei vocii \u00een condi\u021bii de volum limitat de informa\u021bii transmise, \u00een afar\u0103 de metodele obi\u0219nuite de comprimare a sunetului \u0219i conversie a semnalelor, Lyra folose\u0219te un model de vorbire bazat pe un sistem de \u00eenv\u0103\u021bare automat\u0103, care permite recrearea informa\u021biei lips\u0103 pe baza caracteristicilor tipice ale vocii. Modelul utilizat pentru generarea sunetului a fost antrenat folosind mii de ore de \u00eenregistr\u0103ri vocale \u00een peste 70 de limbi.

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

Codecul include un coder \u0219i un decoder. Algoritmul de func\u021bionare al coderului const\u0103 \u00een extragerea parametrilor datelor vocale la fiecare 40 de milisecunde, comprimarea acestora \u0219i transmiterea c\u0103tre destinatar prin re\u021bea. Pentru transmiterea datelor este suficient un canal de comunica\u021bie cu o vitez\u0103 de 3 kilobi\u021bi pe secund\u0103. Parametrii sonori extrasi includ spectrograma mel-logaritmic\u0103, care are \u00een vedere caracteristicile energiei vocale \u00een diferite intervale de frecven\u021b\u0103 \u0219i este preg\u0103tit\u0103 \u021bin\u00e2nd cont de modelul percep\u021biei auditive umane.

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

Decodorul utilizeaz\u0103 un model generativ care recreeaz\u0103 semnalul de vorbire pe baza parametrilor audio transmi\u0219i. Pentru a reduce complexitatea calculilor, a fost aplicat un model u\u0219or bazat pe re\u021bele neuronale recurente, care este o variant\u0103 a modelului de sintez\u0103 vocal\u0103 WaveRNN, \u00een care se folose\u0219te o frecven\u021b\u0103 de e\u0219antionare mai mic\u0103, dar se genereaz\u0103 simultan mai multe semnale \u00een diferite intervale de frecven\u021b\u0103. Semnalele ob\u021binute sunt apoi suprapuse pentru a crea un singur semnal de ie\u0219ire corespunz\u0103tor frecven\u021bei de e\u0219antionare specificate. <\/p>\n

Pentru a accelera procesul, au fost de asemenea utilizate instruc\u021biuni procesor speciale disponibile pe procesoarele ARM pe 64 de bi\u021bi. Ca urmare, \u00een ciuda utiliz\u0103rii \u00eenv\u0103\u021b\u0103rii automate, codec-ul Lyra poate fi utilizat pentru codificarea \u0219i decodificarea vorbirii \u00een timp real pe smartphone-uri de mijloc, demonstr\u00e2nd o \u00eent\u00e2rziere a transmisiei semnalului de 90 de milisecunde.
\n
Sursa: opennet.ro<\/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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