DSL Digital subscriber line. A broadband connection that
DSL Digital subscriber line. A broadband connection that can carry voice or data traffic. The asymmetric DSL (ADSL) uses a legacy copper pair to provide high-speed downloads to the client alongside the analog telephone service. Encoding The compression and packetization of video and audio to a streaming format. Frame 1. A single television picture, the result of a scanned raster. An interlaced frame comprises two fields. 2. A packet of data used in telecomms circuits. H.261 ITU video-conferencing standard. H.263 Development of H.261 for low bit-rate applications like video phones. Huffman coding A variable-length coding scheme where the most-used characters have a shorter code than the lesser-used characters. Indexing The generation of a content catalog index by the extraction of metadata from the content. Interlace scan The odd then even lines of a television frame are scanned alternately. Intranet A private network for sharing similar content formats to that available over the public Internet, but for corporate use only. JPEG Joint Photographic Experts Group. A compression standard for continuous-tone still images. JPEG2000 A compression standard for continuous-tone still images using wavelet compression. MDCT Modified Discrete cosine transform. A perfect reconstruction cosine modulated filter bank. It has the property of time-domain aliasing cancellation. Metadata Attributes of data, or data about data. MPEG Moving Picture Experts Group. A working group of the ISO/IEC that develop standards for digital video and audio coding. MPEG-1 Audio and video compression for CD-ROMs. MPEG-2 Television and DVD compression standard. MPEG-4 Rich media object coding standard for fixed and mobile use. MPEG-7 Metadata framework for multimedia. MPEG-21 Framework for integrating multimedia resources and to facilitate value exchange. MP3 The audio codec for MPEG-1, layer 3. Multicast A means of live webcasting to a large audience that requires a single stream to be transmitted by the server, rather than one per client. Each viewer connects to the multicast, so the network routers send copies of each datagram of the stream to all the clients participating in the multicast. Potentially can save network resources, but is not well supported on the WWW. Narrowband A dial-up connection to the Internet, typically using a 28K or 56K analog modem over a regular telephone line. 328 The Technology of Video and Audio Streaming
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