Source of 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

*. [#d62939f6]

- 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