NCast Telepresenter M4 - Manual (Page 12)

NCast Telepresenter Reference Manual
2. Theory of Operation
2.1. T
ELEPRESENTER
C
OMPONENT
B
LOCK
D
IAGRAM
The Telepresenter consists of these main hardware functions:
Digitizer Capture Hardware – A specially designed, high-performance PCI card is used to grab and
digitize the RGB or video signals created by the presenter or media source. This card accepts VGA, DVI,
PAL/NTSC composite or PAL/NTSC S-Video connections and converts those signals to RGB or YUV digital
format. With the introduction of the Digitizer-3 PCI card, two of these inputs may be active simultaneously for
generation of a picture-in-picture (PIP) display.
Central CPU – A general-purpose, high performance processor is used to compress and decompress
media streams, to encapsulate and decapsulate outgoing and incoming packets streams, to enable the web
interface, serial interface and telnet interface, and to prepare data for display on the attached monitor. A
highly secure open-source operating system underlies and supports all of this functionality.
Display Output Sub-system – Media streams, which are received and decoded, are presented on the
attached display for viewing.
Audio Sub-system – A sound system with stereo input-output capabilities and with support for microphone
and line-level inputs and line-level outputs is used to create the AAC audio streams transmitted in
conjunction with the associated graphics or video imagery.
Ethernet Interface – Industry-standard Gigabit ethernet connectors are used to connect the Telepresenter
with the Internet network used for communications.
NCast Corporation Revision 2.2
Page 12