![]() ![]() ![]() While Lyra is currently aimed at speech use cases, Google is exploring how to make it into a general-purpose audio codec. Except for audio encoded in Lyra, each of the speech samples suffers from degraded audio quality at very low bitrates.Ĭlean says it 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." As such, the new codec is already rolling out in Google Duo to improve call quality on very low bandwidth connections. Here are some speech samples provided by Google. According to Google, Lyra easily outperforms the royalty-free open-source Opus codec as well as other codecs like Speex, MELP, and AMR at very low-bitrates. That's because Lyra is designed to operate in heavily bandwidth-constrained environments such as 3kbps. Paired with the AV1 codec for video, Google says that video chats can take place even for users on an ancient 56kbps dial-in modem. To overcome the computational complexity concerns of running a generative model on-device, Google says Lyra uses a "cheaper recurrent generative model" that works "at a lower rate" but generates multiple signals at different frequency ranges in parallel that are later combined "into a single output signal at the desired sample rate." Running this generative model on a mid-range device in real-time yields a processing latency of 90ms, which Google says is "in line with other traditional speech codecs." The benefit of Lyra over these state-of-the-art waveform codecs, according to Google, is that Lyra doesn't send over the signal sample-by-sample, which requires a higher bitrate (and thus more data). Google says its approach has made Lyra on par with the state-of-the-art waveform codecs used in many streaming and communication platforms today. SENT means the communication was delivered at the recipient’s fuel phone. Most likely when you send a message you will get a delivered confirmation when the message has been delivered he toldThe googles Duo app works like. ![]()
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