{"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\/pl\/blog\/news\/google-opublikoval-audiokodek-lyra-dlya-peredachi-rechi-pri-plohom-kachestve-svyazi","title":{"rendered":"Google opublikowa\u0142 kodek audio Lyra do transmisji mowy przy s\u0142abej jako\u015bci po\u0142\u0105czenia","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Firma Google zaprezentowa\u0142a nowy kodek audio Lyra, zoptymalizowany pod k\u0105tem osi\u0105gni\u0119cia maksymalnej jako\u015bci transmisji mowy, nawet przy bardzo wolnych kana\u0142ach komunikacyjnych. Implementacja Lyra zosta\u0142a napisana w C++ i jest dost\u0119pna na licencji Apache 2.0, jednak w\u015br\u00f3d niezb\u0119dnych do dzia\u0142ania zale\u017cno\u015bci znajduje si\u0119 w\u0142asno\u015bciowa biblioteka libsparse_inference.so, kt\u00f3ra zawiera rdze\u0144 do oblicze\u0144 matematycznych. Zauwa\u017cono, \u017ce w\u0142asno\u015bciowa biblioteka jest tymczasowa \u2014 w przysz\u0142o\u015bci Google obiecuje opracowa\u0107 otwarte zamienniki i zapewni\u0107 wsparcie dla r\u00f3\u017cnych platform. <\/p>\n

Pod wzgl\u0119dem jako\u015bci przesy\u0142anych danych g\u0142osowych przy niskich przep\u0142ywno\u015bciach Lyra wyra\u017anie przewy\u017csza tradycyjne kodeki wykorzystuj\u0105ce metody cyfrowego przetwarzania sygna\u0142u. Aby zapewni\u0107 wysok\u0105 jako\u015b\u0107 transmisji g\u0142osu przy ograniczonej ilo\u015bci przesy\u0142anych danych, w Lyrze opr\u00f3cz standardowych metod kompresji d\u017awi\u0119ku i przekszta\u0142cania sygna\u0142\u00f3w stosowany jest model mowy oparty na systemie uczenia maszynowego, kt\u00f3ry pozwala odtworzy\u0107 brakuj\u0105ce informacje na podstawie typowych cech mowy. Model u\u017cywany do generowania d\u017awi\u0119ku zosta\u0142 wytrenowany z wykorzystaniem kilku tysi\u0119cy godzin nagra\u0144 g\u0142osowych w ponad 70 j\u0119zykach.

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

Kodek obejmuje koder i dekoder. Dzia\u0142anie kodera polega na wyodr\u0119bnianiu parametr\u00f3w danych g\u0142osowych co 40 milisekund, ich kompresji i przesy\u0142aniu do odbiorcy przez sie\u0107. Do transmisji danych wystarcza \u0142\u0105cze o przepustowo\u015bci 3 kilobit\u00f3w na sekund\u0119. Wyodr\u0119bniane parametry d\u017awi\u0119ku obejmuj\u0105 logarytmiczne mel-spektrogramy, uwzgl\u0119dniaj\u0105ce charakterystyk\u0119 energii mowy w r\u00f3\u017cnych zakresach cz\u0119stotliwo\u015bci i przygotowane z uwzgl\u0119dnieniem modelu ludzkiej percepcji s\u0142uchowej.

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

W dekoderze zastosowano model generatywny, kt\u00f3ry na podstawie przekazanych parametr\u00f3w d\u017awi\u0119ku odtwarza sygna\u0142 mowy. Aby zmniejszy\u0107 z\u0142o\u017cono\u015b\u0107 oblicze\u0144, wykorzystano lekki model oparty na rekurencyjnej sieci neuronowej, b\u0119d\u0105cy odmian\u0105 modelu syntezy mowy WaveRNN. U\u017cywa on ni\u017cszej cz\u0119stotliwo\u015bci pr\u00f3bkowania, ale r\u00f3wnolegle generuje kilka sygna\u0142\u00f3w w r\u00f3\u017cnych zakresach cz\u0119stotliwo\u015bci. Uzyskane sygna\u0142y s\u0105 nast\u0119pnie nak\u0142adane na siebie, aby otrzyma\u0107 jeden sygna\u0142 wyj\u015bciowy odpowiadaj\u0105cy zadanej cz\u0119stotliwo\u015bci pr\u00f3bkowania. <\/p>\n

W celu przyspieszenia dzia\u0142ania zastosowano r\u00f3wnie\u017c wyspecjalizowane instrukcje procesora dost\u0119pne w 64-bitowych procesorach ARM. W rezultacie, mimo wykorzystania uczenia maszynowego, kodek Lyra mo\u017ce by\u0107 u\u017cywany do kodowania i dekodowania mowy w czasie rzeczywistym na smartfonach ze \u015bredniej p\u00f3\u0142ki cenowej, zapewniaj\u0105c op\u00f3\u017anienie transmisji sygna\u0142u na poziomie 90 milisekund.
\n
\u0179r\u00f3d\u0142o: 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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