The free version includes most of the core features of Echo, including the ability to share comments on Twitter and Facebook, nested replies, moderation tools, and customization.

免费版包括Echo的大部分核心功能，包括在Twitter和Facebook上分享评论、嵌套式回复、调整工具和自定义。

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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.

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。

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In this paper, we describe an application of digital speech processing chip FM1073 to improve the performance of acoustic echo cancellation in the Bluetooth hands-free system.

主要说明了数字语音处理芯片FM1073在蓝牙车载免提系统中进行回声消除处理的应用方法。

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The dynamic speaker also includes a built-in microphone, for use as an enhanced speakerphone, capable of delivering crisp, clear echo-free phone conversations.

ENGADGET: Scosche intros BoomBottle, thinks you'll prefer sound over water during bike rides

They simulated stray radio tower signals in UL's echo-free chamber (pictured here)outside Chicago to make sure the signals wouldn't accidentally trigger a car's air bag.

FORBES: By the Numbers

The Bluetooth portable speaker doubles as mobile home theaterin the office, garage or dorm room, providing the same impressive audio when playing movies, TV shows, or games on a connected mobile device. boomBOTTLE also features a built-in microphone for use as an enhanced speakerphone capable of delivering clear, echo-free phone conversations.

ENGADGET: Scosche BoomBottle ships for $150, just in time to serenade fellow cyclists (video)