{"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\/it\/blog\/novosti-interneta\/google-opublikoval-audiokodek-lyra-dlya-peredachi-rechi-pri-plohom-kachestve-svyazi","title":{"rendered":"Google ha pubblicato il codec audio Lyra per la trasmissione della voce in condizioni di scarsa qualit\u00e0 della connessione","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Google ha presentato un nuovo codec audio Lyra, ottimizzato per garantire la massima qualit\u00e0 della trasmissione vocale anche su canali di comunicazione molto lenti. Il codice sorgente di Lyra \u00e8 scritto in C++ ed \u00e8 rilasciato sotto licenza Apache 2.0, ma tra le dipendenze necessarie al suo funzionamento \u00e8 presente una libreria proprietaria libsparse_inference.so, che implementa il nucleo per calcoli matematici. Si sottolinea che la libreria proprietaria \u00e8 temporanea \u2014 in futuro Google promette di sviluppare un sostituto open-source e di garantire il supporto per diverse piattaforme.           <\/p>\n<p>In termini di qualit\u00e0 del suono vocale trasmesso a basse velocit\u00e0, Lyra supera significativamente i codec tradizionali che utilizzano metodi di elaborazione digitale del segnale. Per garantire un'elevata qualit\u00e0 nella trasmissione della voce in condizioni di limitata larghezza di banda, oltre ai consueti metodi di compressione audio e di conversione dei segnali, Lyra utilizza un modello vocale basato su un sistema di apprendimento automatico che consente di ricostruire le informazioni mancanti sulla base delle caratteristiche tipiche della parola. Il modello impiegato per la generazione del suono \u00e8 stato addestrato utilizzando migliaia di ore di registrazioni vocali in oltre 70 lingue.   <center><img decoding=\"async\" alt=\"Google ha pubblicato il codec audio Lyra per la trasmissione della voce in condizioni di scarsa qualit\u00e0 della connessione\" src=\"\/wp-content\/uploads\/2021\/04\/dff1cbc3a2422197df2b4510b0a4fc75.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>  <\/p>\n<p>Il codec comprende un codificatore e un decodificatore. L'algoritmo di funzionamento del codificatore si basa sull'estrazione dei parametri dei dati vocali ogni 40 millisecondi, sulla loro compressione e sull'invio al ricevente tramite rete. Per trasmettere i dati \u00e8 sufficiente un canale di comunicazione con una velocit\u00e0 di 3 kilobit al secondo. I parametri audio estratti includono spettrogrammi mel-logaritmici, che considerano le caratteristiche dell'energia della voce in vari intervalli di frequenza e sono preparati tenendo conto del modello di percezione uditiva umana.     <center><img decoding=\"async\" alt=\"Google ha pubblicato il codec audio Lyra per la trasmissione della voce in condizioni di scarsa qualit\u00e0 della connessione\" src=\"\/wp-content\/uploads\/2021\/04\/5fedbeb0d9e364c54c9fd35dab76f019.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<p>Nel decodificatore viene utilizzato un modello generativo, che ricostruisce il segnale vocale sulla base dei parametri audio trasmessi. Per ridurre la complessit\u00e0 dei calcoli, \u00e8 stato impiegato un modello leggero basato su una rete neurale ricorrente, che rappresenta una variante del modello di sintesi vocale WaveRNN, in cui viene utilizzata una frequenza di campionamento inferiore, ma vengono generati contemporaneamente pi\u00f9 segnali in diverse gamme di frequenza. I segnali ottenuti vengono poi sovrapposti per ottenere un unico segnale di output, corrispondente alla frequenza di campionamento specificata.     <\/p>\n<p>Per accelerare sono state applicate istruzioni di processore specializzate, disponibili nei processori ARM a 64 bit. Di conseguenza, nonostante l'uso dell'apprendimento automatico, il codec Lyra pu\u00f2 essere utilizzato per codificare e decodificare l'audio in tempo reale su smartphone di fascia media, mostrando una latenza di trasmissione del segnale di 90 millisecondi.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=54917\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\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 \u043d\u0430\u043f\u0438\u0441\u0430\u043d \u043d\u0430 C++ \u0438 \u043e\u0442\u043a\u0440\u044b\u0442 \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 Apache 2.0, \u043d\u043e \u0432 \u0447\u0438\u0441\u043b\u0435 \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u044b\u0445 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u043f\u0440\u0438\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u0435\u0442 \u043f\u0440\u043e\u043f\u0440\u0438\u0435\u0442\u0430\u0440\u043d\u0430\u044f \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430 libsparse_inference.so \u0441 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0435\u0439 \u044f\u0434\u0440\u0430 \u0434\u043b\u044f \u043c\u0430\u0442\u0435\u043c\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u0439. \u041e\u0442\u043c\u0435\u0447\u0430\u0435\u0442\u0441\u044f, \u0447\u0442\u043e \u043f\u0440\u043e\u043f\u0440\u0438\u0435\u0442\u0430\u0440\u043d\u0430\u044f \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0439 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":99676,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-99675","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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 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Il codice di implementazione di Lyra \u00e8 scritto in C++ ed \u00e8 aperto con licenza Apache 2.0, ma tra le dipendenze necessarie \u00e8 inclusa una libreria proprietaria libsparse_inference.so con un'implementazione del nucleo per il calcolo matematico. Si segnala che la libreria proprietaria \u00e8 temporanea.","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/google-opublikoval-audiokodek-lyra-dlya-peredachi-rechi-pri-plohom-kachestve-svyazi","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47Google \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u0430\u0443\u0434\u0438\u043e\u043a\u043e\u0434\u0435\u043a Lyra \u0434\u043b\u044f \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0438 \u0440\u0435\u0447\u0438 \u043f\u0440\u0438 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