Google AI Blog: Lyra: A New Very Low-Bitrate Codec for Speech Compression ai.googleblog.com/20 　we’ve applied traditional codec techniques while leveraging advances in machine learning (ML) with models trained on thousands of hours of data to create a novel method for compressing and transmitting voice signals.ついにコーデックにML使うようになってしまったのかぁという感慨がある（？）