USENIX 2005 Annual Technical Conference, FREENIX Track Abstract
Pp. 151162 of the Proceedings
The Ethernet Speaker System
David Michael Turner and Vassilis Prevelakis, Drexel University
If we wish to distribute audio in a large room, building, or even a
campus, we need multiple speakers. These speakers must be jointly
managed and synchronized. The Ethernet Speaker (ES) system presented
in this paper can be thought of as a distributed audio amplifier and
speakers, it does not ``play'' any particular format, but rather relies
on off-the-shelf audio applications (mpg123 player, Real Audio player)
to act as the audio source. The Ethernet Speaker, consists of three
elements: (a) a system that converts the audio output of the unmodified
audio application to a network stream
containing configuration and timing information (rebroadcaster), (b) the
devices that generate sound from the audio stream (Ethernet Speakers),
and (c) the protocol that ensures that all the speakers in a LAN play
the same sounds.
This paper covers all three elements, discussing design considerations,
experiences from the prototype implementations, and our plans for
extending the system to provide additional features such as automatic
volume control, local user interfaces, and security.
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