'Knock Knock' shows a live preview of the caller before the recipient picks up, which Google says is to 'make calls feel more like an invitation rather than an interruption'. Īccording to a technical study commissioned by Google from Signals Research Group in 2017 that compared degradation time over 3G, LTE, and Wi-Fi, Duo provided the highest voice and video quality of any service or app. įor packet loss concealment Duo uses WaveNetEQ, a generative model based on DeepMind/ Google AI’s WaveRNN. Google trained machine learning models on thousands of hours of data in order to create the method used by Lyra on compression and transmission of voice signals.

In February 2021, Google announced a new very low- bitrate codec for speech compression called ' Lyra', that can operate with network speeds as low as 3kbps that avoids robotic voice audio. Optimization is further achieved through the degradation of video quality through monitoring network quality. Google Duo is optimized for low- bandwidth mobile networks through WebRTC and uses QUIC over UDP. The Google Duo web app will also be redirected to the Google Meet web app. The merger began in August, with the Duo mobile app being renamed to Meet, while the original Meet is called Meet Original and will be phased out. In June 2022, Google reversed course and announced that Duo and Meet would, in fact, be merged. In December 2021 this objective had been dropped, but Duo continued to be available and updated. In August 2020, it was reported that Google was planning to eventually merge Google Duo with the business-oriented Google Meet. In December 2016, Google Duo replaced Hangouts within the suite of Google apps device manufacturers must install in order to gain access to the Google Play Store, with Hangouts instead becoming optional.

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