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Chapter 11. HAVi > ABOUT HAVI

ABOUT HAVI

HAVi is an abbreviation for Home Audio/Video Interoperability. It is a project that was started by eight promoter companies—Grundig, Hitachi, Panasonic, Philips, Sharp, Sony, Thomson, and Toshiba. Eighteen other participant companies have joined—Digital Harmony Technologies, Loewe Kenwood, LG Electronics, Mitsubishi Electric, Pioneer, Samsung Electronics, Sanyo, Seiko, Epson, Sun Microsystems, Tao Group, QNX Software Systems, Vivid Logic, 3A International, Infineon Technologies AG, Teralogic, Wind River Systems, and Yaskawa Information Systems. HAVi adopted the IEEE 1394 bus standard as the underlying network technology for the HAVi protocols as well as for the transport of the real-time A/V streams.

The HAVi architecture specifies a set of APIs that allow consumer electronic manufacturers and software engineering companies to develop applications for IEEE 1394-based home networks. One of the main reasons HAVi selected IEEE 1394 over other transmission protocols is because of its support for isochronous communications. The term isochronous ("iso" meaning "equal" or "identical" and "chronous" meaning "time") refers to the ability of 1394 to guarantee delivery of data packets at fixed intervals. This feature underpins its usefulness in an A/V-centric home network because it ensures that audio and video streams can be guaranteed to meet the real-time constrains, such as television at 30 frames per second. HAVi comprises software elements that facilitate the interoperability between different brands of entertainment devices within your home. Interoperability is an industry term that refers to the ability of an application running on an in-home appliance to detect and use the functionality of other appliances that are connected to the same network.


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