Lyra

Audio | Voice

• https://github.com/google/lyra

• Lyra: A New Very Low-Bitrate Codec for Speech Compression
  • https://ai.googleblog.com/2021/02/lyra-new-very-low-bitrate-codec-for.html
• Lyra - enabling voice calls for the next billion users
  • https://opensource.googleblog.com/2021/04/lyra-enabling-voice-calls-for-next-billion-users.html
• Lyra V2 - a better, faster, and more versatile speech codec
  • https://opensource.googleblog.com/2022/09/lyra-v2-a-better-faster-and-more-versatile-speech-codec.html

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• 3kbpsという低いビットレートでも高音質を実現するコーデック「Lyra」をGoogleが開発
  • https://gigazine.net/news/20210303-google-codec-lyra/

• https://twitter.com/kazunori_279/status/1365095215686578178

  この3kbpsでこの音質すごい。ログメルスペクトログラムで特徴抽出、低帯域と低遅延に特化したWaveRNN系モデルでエンコード。

• https://twitter.com/yohhoy/status/1365115303667978243

  言語差異どうなんかなーと思ったけど "We’ve trained Lyra with thousands of hours of audio with speakers in over 70 languages using open-source audio libraries and then verifying the audio quality with expert and crowdsourced listeners." そこは考慮されてるぽ

• Lyra V2 メモ
  • https://zenn.dev/voluntas/scraps/d1676e69045695