[USA]只需3kbps就能清晰通话，这个谷歌音频工具开源了
时间：2021-04-12 17:33:55 热度：37.1℃ 作者：网络
<p>3kbps也能清晰通话的神器Lyra，开源了！</p><p>Lyra是谷歌公司推出的一款不惧低带宽的音频编解码器，用来实现随时随地高质量通话。</p><p>3kbps是什么概念？</p><p>换算成生活中常见的单位，等于0.375KB/s。</p><p>对比来看更加直观，Skype官网给出的通话最低速度是30kbps，带宽要求整整高出了10倍。</p><p style="text-align: center;"><img style="filter: brightness(0.96);" src="https://meiguo.com/uploadfiles/images/49/20210412/023211_jH50Ck.png" alt="只需3kbps就能清晰通话，这个谷歌音频工具开源了"><p>Lyra利用机器学习模型，将原始音频压缩到3kbps，即使没有高速网络，也能得到自然清晰的语音。</p><p>它的架构与传统的编解码器类似，分为编码器和解码器两部分：</p><p style="text-align: center;"><img style="filter: brightness(0.96);" src="https://meiguo.com/uploadfiles/images/49/20210412/023213_BuAnYu.png" alt="只需3kbps就能清晰通话，这个谷歌音频工具开源了"><p>编码器以40毫秒为单位，从语音中提取特征，进行压缩后通过网络传输。</p><p>解码器利用机器学习模型，能使用最少的数据量重建语音，将特征转换成完整的音频波形，以进行播放。</p><p>带宽要求低、效果更好</p><p>在Lyra之前，音频编解码器的比特率越低，语音的清晰度就越差，并且机械感越重。</p><p>传统的音频编解码器使用的是数字信号处理技术，而Lyra则依赖其强大的信号重建能力。</p><p>由于Lyra无需逐个处理信号，因此无需高带宽，而且在保持低比特率的同时，还能提供高质量的音频输出。</p><p style="text-align: center;"><img style="filter: brightness(0.96);" src="https://meiguo.com/uploadfiles/images/49/20210412/023214_lArHxn.png" alt="只需3kbps就能清晰通话，这个谷歌音频工具开源了"><p>谷歌还使用Lyra与Opus、Speex，在6kbps和3kbps的情况下，对同一音频的压缩质量进行对比测试。</p><p tt-videoid="v0d004g10000c1psvj6josdh66pqs2ag" tt-poster="http://p9.pstatp.com/large/tos-cn-p-0026/78dd52516686e92be8ff06aa632b95d5" 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YcvMKeO7nzPUuBfhrLl4CFprP6oGfhKxyR+pCAWO6TgKet27MJ0WIxjn+AWo2lpgy1mltirjfPOAC53qEOq9RK8FCV36VwEDPynezuT5BV19/A37h8d+sSS8GM0NMrcVYFZ6enu8mmhXjuECgMx7O4Gh9qCHqyPpWIii3sNHT2e6scSX2Q7WrT6tT3piwA9qo4x9ghTp4lChELkbGCNFc4E7gOI/zmVE1v9X4IFt09n8h4r69gana76eo+X12O03UW422j1sxLtAJMN0VooEqGPsnvFHvmO8zQH+PWThUOaEf6SuOSNvXDM49Iba5WwFCVA+scp4hbrXXApyjrzDsYbTjIwm4nT5Gww3aTkL0tQIEyKUQHmhobKwNGMrdddbsv40a3R5hU+9MUNa2aVZIOauJ1sbcd75ZCVWW+EyXe2b29oSrMXvElP2euZ4EDFXF4r6ONL5VJ+CqjGqMPxvTtVVVeINjw6tViwSYAbwd4dGvBx50vuuig7Wz4S/m61IzDENNu15MKERNMR03z6EjuqqDXSxz2x/4qnP9oprtcmMnDy90p/a96z+dCOxpyv0HCcFUONwewG8IZ7fr1XdbDOyqnx2TUcKp1pB/J3o6tM4I0cQQnqifw9+c4TFxF6ukB/gB8Dv1meKE6GUk1JCWELk4oAQhusH4lzduI21zvoei2DXE9Ozt4a+u8PiXT8TUuUGVzmV63bfSzKCNSDB0aZkeerMuK28yvtWoiN/sZYg6UhKi59X5dVdoxWC0cfxfVt9yW2Bjib9f5+G93D6p1gkyzqwy3YlckVHHNcA04LUIP8aFL46zJSF9cItqJNd59s2Avsap/nfEPbsVKEQbECZ5P2eFVii6I4y3i8s8y/hy4edq0gapT+cuOI5znPa1wDMe03Q90YHmqQ6f1iZMw2bMIC2Psb8umj1lmiPK2wdw0SuBKSOGaKsy/MqGBIOw0BGiWvXbmgvgge4hl9WdCvxlGzrP/3XMisV6sqkmD8asLMNQ47zfM6ojXGyKuOFgs+T1Bd1eM6uD6hI7ac8ihagp4f3nGo6sEJN2I/BFo9ku5P8Hm0PMT7GoSCpEUTdwO2xZyEx/wVwfXWLDh5qOqE9ZiOab66RCdJX6CS46ItH6dttBYLoB1yGxxLgoRB2S/vO8WVAVjaRCdBzwaef68ZByTxtn7wJKC63safyhloQ+UVIhWk5uEDKJX3Q1QpL6cKz6dh2LfN4j1L8pFPcggdqfEZ/cN0E5n/0ilvKpC1EPdeBc3BVho92VSS2SelsM2iAscBKn2mqitQXUM99oooqI9tyilEQUDkVSU7omqLuLuR6j1MOOBbR/D11Ru5wVCSdbnLBXpGHO+mqHWOdxScRvJpIbOJygEl9oAHOQMQ2FCFFTkUJUZZxJdwEyldygrYX7zMNVK+9IdDbjoJAFzAhHcK0gW4w117+PqC9DLtkbF5bpEOITJxai8eoouzzNmpiODPylazyC9aoKZTH+UBxHlJYQhZm0EeRnBj5iri8wtMe+SLpKt4iFSxg/Fgxuz5gVcgfg6871S+QTwC72M+7FshhL4JZtW6gQDUSSwDJm+X40+aEOHyZ5TN6uwE9LWJlFaaJ2ZtYUIkQLDb/iE6IlSC5ysOo5C2Hn7X1GIWm2AO/oQsOND/7NCMSXYto203mWdZ46exiTeFvM/caY6796TGcXZ7xc6+HGLAckEaIKc4PXgc8Bf084MC1IUtYE4wzvUKQQrUHSQ5NooUJ9ovWGOvAJ0VqElDsdCRfcFaHV9gZO1b+rgUeRJPuzyMbqQIKecT7Je6o9voXsFlllvn9D+7hJNaMbg1xnfNWe2gZ3UbGIfGI0WBhZXunxkHtvDhOilXqTWeoo1yTwSXyCdJ1SA08h+6cuLeD3Q4r0h8I0USXwJ+2kP5kJNM/U29nz+9Xqb8SFhBqAPyABzgDPqOCt1+uDyU29iOLnViIbB8KI4OvUZNYZv+xiJAQzW39/C7mZn7fpGM0my2YvQKIW3T2+1iTHHbnZEegbo3yiO4HDVQWWEqOZgSSmn0z85r4A7YHdivSHwoTocCTxq53+HR3iF1VS3pSYQcjuFtdJfrQM9UzV1fFoJMnwFOe7euW0AgE+GNmjNhIJhP+S/C1En0FynQapQPcDevWvrr68ktx4V1e2DayTZiP4tUZTpKGJOkVcW+d6eBkFaA65CX1zKW+o5Apyc6lbkB0eNva5Sr/7MZJLHWCroQ/m6fhsCji2SnL3Po0mvV2kcVyKNQHFOtWW+wgToncj/KZX1P8IcEAZnvkgFdZdnM9WIGk3W8tQXx/gISQKj6FcnozgwcYbMzuG3L1mO+nvB7qqe4YZvHFlFqAq8qPBM0sUoh0iSDJ3JeNii5mdC8ySPi1UAleqX+i24U0182+TH0KqKqG+nkiy/aue1d/t5O/iCARuhoe++SZwP3CIGYNdgOnB5M0gbPTZjvm4Sbmhu3VVlqYJOwAJG7iJU495nMahxn6vj7n3Sg8vdbGjbXbWGRj1m7lk44M9dDHxSonPPER9yxGeSXGMo4EtX/MjJOFsreMjLsefYtJGV26f0fZ/kfxQUwtyToCPbT9Vx9xmtp5Pdh/dG0pfzCVLkNYAMxsaGw8JdsBer7NlW2Mtkq+ywnze7KyQZhK9YyLoyGX4s/p8mOMxqYcZNX8ludtkLM4gN5doX3J3up6jDqrVio/qwDUbzbmE6IDoO6oRlhiz+wx+JtulZ84KMWF/V+GzS/zT1DH38YfPkbuXblGgfa4G7tjGArRaycsVHuKws5lFcdiiqndTgrLN+Hc22M19n4+5j9UK1q85xwjQJqU4jic/Z6lFl9RR7d9JB9fF+REC1KTaZ48QAUI1GMZHGxEiQCARjDrz7EMqnQ44F39uddr4SGfwMPy7QT9UfiNo1+SE952N7EZYEVHmBSQUsTREuFzf7Ncx9c1zVpVrPCb5PkP27a++YNikeEbbvzKiTruKnObp26d0QvVT/yfKFXjbmNhhyLE6UVhIbkB+YdiBDoPVL+pFertk16tqnWsYTx+6qJZamuChfKZthJq2SkcLvITswmiJ4afqdMYtSFBXjZqDOYZcDDBKzfUdZMMhSdo/Ekm9qdRFw2DVDr5JdxhwngroCyTL6HQpnWuRjaSTC+znA9XBnlbIqSCtaEUe+ldXl7xhrxWtaBWiVrQKUStahagVrULUilY4QtQb2W7iYgxy5Eg58F2EBGuLUO7lCvp2Iz8AGaAj+fvTS+nHKWSzBNsgIYYgW+Hb5J81WSx6Ibs6yo22SAbjAO2nfRCu61CEBjkVGNvQ2JgJOKCLyGVLq5GTSluQxLRVKTauMxLouwXJMRpIcYd9x2GC/h2rHbIOyYf5BULtb9bnOp1kZyhG4TRkWxUIUToRib9NRBLCLqK4bdo+1JLNtepL/nlGvZFgal2J9VQh3NEHCKlag/B30/SzdQiJ2raSbFbcHci+qY4I2zoeIaL+QmGHSSbp8IcRUmw8EnOqd15N5AdLi8H7quG+hJBp3RHi9HGESB2GBCtLFaCdVbMep5NhRyTJq1I7fipCsl6dQj8eiwTLu6hg7upoiwFIDDSoq1Ss1rEIWPkuKjw7a737ICnTZJC0x2uROEyVaolZSC5KINnPIZlx/0xBRY5HYkhjkRDFCaom30NCB0+Szmlh9yMpudfrM44vk9k8SPvxMiRs8bT2171ItuAPyaZfbEihvhodh5FIIDQ4fvhMfR2YkuXoRJbFrtHnPM1jNdpV1Dc0PIUE97oiaRlDyE8S24zEZc4rsWFX6KCegFDmj2ldk5EI+P1I/nNdiSbuSK3LYj6SEeCe+zxdX6VgMbLzNNg2PhX53xzVSL71gfo876cwuAuRzMNvIIl2tzrmu55s+kapmKzapg0SjH6W3BysAOuDsMd0JPYyS7WRPYjhzRTUfm8VlDlqLh9GAoXL1OQsUqfxScJPQysG9WS3uByO7Jy4FcnzOdsxo6WgUQc3SEW5TR3P9khu1PNI7PCYEuvpgMQTByLnd3cgezRQlU72IOD6efwn9heKm3V8fDtc5vevrp6eUTXfWW3eAVr5YE8nXVNiY9aoOgw6MqOz1025eBvJ4zk5BVX8mL7/FNkNfQ/qIMzRzp6TkqA2q/Y5Qq+XI7k/A3SyHJJSPdWqDQboWNWSzZVOWxNVIPnW5+pqcJH5frhq/I9Pj12ARI0b9YtJZKPSnZHQf6lCtFU1XSBEJ6l5cWfLvWrudqOwfxqTp2K1zRuQlNDfIdkDx5LdhJgmOupkCDTRIfqqUiGe4DzfyyXUsww5vmYBshHyA8qHKWo9JqvA9PEI9OJAG/xEVxTDyOYAL3VUfFWZGnmlmhYXH6kpOJvSTqzYQXmawEd5HTk7u4niD5iIwlzVRFOR/PDXtG976UAvclaMpWKpTo7Pqpa4vUzjc5v6dd/Df6bAxztnM7qa6Kta4QGHN2rS9+X6Z3pHqQ3fBUmgCvJ3bqL04+p2Q9JQNyGZkk8qlXGNdkyaGKo+5V5Iknx3dUYnq9k5j/ztz8Vid32ucaoFDtaxy+gzL0/xudxMz9nk51cNV5+MDPnpmpeotK92JO7IFBv3gQ7umyqsZ6i/FKRwbkxptj6EnNszxeFzLnFWfetSep6+uqJdhSS+rSGbXbk1xXqCgbuY7D61ehXSk7XeGWWY7Bt1gnTwmLNlAP8bANSszvCsdJZ0AAAAAElFTkSuQmCC");"><p></p><p>结果显示：</p><p>在3kbps的情况下，Lyra性能优于现有的其他编解码器；</p><p>在8kbps的情况下，其性能优于Opus，同时降低了超过60%的带宽；</p><p>甚至，Lyra在3kbps情况下的语音清晰度，也优于6kbps情况下的Opus。</p><p style="text-align: center;"><img style="filter: brightness(0.96);" src="https://meiguo.com/uploadfiles/images/49/20210412/023217_wUwMhG.png" alt="只需3kbps就能清晰通话，这个谷歌音频工具开源了"><p>谷歌公司认为Lyra可能有广泛的应用前景，比如：降低音频文件大小，以存储大量语音；节省手机电量；以及缓解网络拥堵等。</p><p>已在GitHub开源</p><p>现在，Lyra已经在GitHub上开源。</p><p style="text-align: center;"><img style="filter: brightness(0.96);" src="https://meiguo.com/uploadfiles/images/49/20210412/023221_RjwmJW.png" alt="只需3kbps就能清晰通话，这个谷歌音频工具开源了"><p>Lyra使用Bazel构建框架，并且使用C++编写代码，以保证速度、效率和可操作性。</p><p>这一版本支持用户在Linux上开发和调试，还针对64位ARM Android平台进行了性能优化，使它不仅能在云服务器上运行，而且还可以在手机上实时运行和训练。</p><p>此外，Lyra还为开发人员提供了编码和解码所需的工具。</p><p>谷歌工程师Andrew Storus和Michael Chinen表示：</p><p>“很高兴看到开源社区的创造力能体现在Lyra上，以开发更多独特和有影响力的应用。”</p><p>感兴趣的读者可戳下方链接了解详情。</p><p>参考链接：<br>[1]https://github.com/google/lyra<br>[2]https://venturebeat.com/2021/04/06/google-launches-lyra-codec-in-beta-to-reduce-voice-call-bandwidth-usage/<br>[3]https://ai.googleblog.com/2021/02/lyra-new-very-low-bitrate-codec-for.html<br>[4]https://opensource.googleblog.com/2021/04/lyra-enabling-voice-calls-for-next-billion-users.html</p>
