新词集锦(433)

Ear and Mouth

Ear and mouth (E&M) is a technology in voice over IP (VoIP) that uses a traditional telephone handset with an earphone (or earpiece) for listening to incoming audio and a microphone (or mouthpiece) for transmitting audio. Calls using an E&M interface can be made from, received from, or disconnected by a private branch exchange (PBX) as well as from a VoIP-capable computer.

The main advantage of E&M is the fact that it allows a PBX to reliably detect disconnect (hang-up) signals. This eliminates problems that can otherwise occur with locked computer ports at the terminations of calls, and thus minimizes the risk of needlessly consuming network resources.

Webcam

Any video camera whose output is available for viewing via the Internet or an intranet. Typically a webcam would be a slow-scan CCD video camera connected to a video capture card in a computer. Images from the camera are captured periodically and made available on a web page. Today ,there are thousands of webcams in operation around the world showing everything from bedrooms to traffic.

Webcasting

Webcasting implies real-time streaming transmission of encoded video (or audio) under the control of the server to multiple recipients who all receive the same content at the same time. This is in contrast to normal web browsing which is controlled from the browser by individual users and may take arbitrarily long to deliver a complete document.

耳嘴接口

耳嘴接口(E&M)是网络电话(VoIP)中的一项技术，它利用传统电话机上的耳机和话筒收听和发送话音。使用耳嘴接口的电话可以从PBX以及拥有VoIP功能的计算机发出、接收或断开。

耳嘴接口的主要优点是允许PBX机可靠地检测断开(挂机)信号。这就克服了很多问题，否则，在电话挂断后会锁住计算机端口，从而避免不必要地消耗网络资源。

网络摄像机

一种摄影机，它的输出可以在互联网或者公司内部网上看到。典型的情况是，一台装有慢速扫描CCD的摄影机，它连接到一台计算机上的视频捕获卡上。摄影机上的图像被定时捕获下来，制作成网页。今天，全世界有成百上千的网络摄像机在工作，从起居室到道路交通都可能用到。

网络视频推送

网络视频推送是一种流媒体的实时传输方式，指在服务器的控制下，在同一时间给多个接收者发送同样的经过编码的音视频内容，它与普通的基于Web浏览器的方式不同，后者的控制权在使用浏览器的用户，用户可以花很长时间来提交一个完整的文档。