他收集的数据得出了一个关于房间回声持续时间、吸音材料的数量和质量以及空间体积之间关系的数学公式。
The data he compiled yielded a mathematical formula for the relationship between a room's echo duration, its quantity and quality of sound-absorbing materials, and its spatial volume.
该系统采用了减噪和降低回声的技术，因此通话质量十分清晰。当有电话打进时，将自动暂停正在播放的歌曲。
Thanks to noise-cancelling and echo-reducing technology, call quality is sharp and clear, and it will automatically pause whatever music you’re listening to when a call comes in .
引言在通信系统中，例如IP电话、可视电话及免提数字蜂窝电话系统中，回声和噪声会严重影响通信质量。
IntroductionIn the communication systems, echo and noise will seriously affect speech communication quality, such as IP telephone, videophone and hand-free digital cell phone systems etc.
重要的是要明白，回声消除用来提高远端用户接收到的语音质量。
It is important to understand that the echo canceller is meant to improve the quality on the remote end.
重要的是要明白，回声消除用来提高远端用户接收到的语音质量。
It is important to understand that the echo canceller is meant to improve the quality on the remote end.
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