A PCI bus analog video decoder is used for three
primary PC solutions: video capture and editing,
video teleconferencing, and television receiver cards.
can place video data directly into host memory for video capture
applications and into a target video display frame buffer for video
overlay applications.
Analog Audio/Video in
I
2
C
Analog
and
Digital
Tuner
Digital
Audio/
Video In
OFDM
DVB
ATSC
MPEG II
All Format
Decoder
(optional)
I
2
S
Fusion
878A
GPIO
CCIR 601
nt
Bt869
(optional)
Composite
and S-Video
Analog
RGB/VGA
Digital RGB Out
Digital television receiver for the PC
xa
Fusion Software Drivers
Fusion offers a suite of widely fielded software drivers for
Windows 95 and Windows 98. With the VxD drivers, board
developers can support products using either the Windows 95
or Windows 98 operating systems. VxD and WDM drivers provide
video capture, playback and display in accordance with Microsoft’s
Video for Windows and Direct Show 2.0, respectively. Dialog
boxes, tuner, GPIO, and I
2
C modules can be modified and
on
e
customized by board developers.
Fusion software drivers are supported by the industry’s broadest
base of ISV applications commercially available for video editing,
teleconferencing, compression, television on the PC and video
email. Software is available through retail and OEM channels.
rich, broadcast data function in the PC. PCI video
decoder solutions provide the most effective means
to achieve this.
Sy
s
Graphics
Memory
System
Memory
master on a single device. Like the Bt848A, the Fusion family
PCI
BUS
Disk
te
A video signal is generated by a video source, which
can be a camera,VCR or TV tuner. The baseband
video that goes into the PCI decoder is a simple
analog signal that contains video analog data and video
synchronization data, which is used to display the
picture properly at the receiving end. The details of
the signal depend on the video standard used —
NTSC (National Television Standards Committee), PAL
(Phase Alternate Line) or SECAM (Systeme Electronique
Couleur Avec Memoire). To transmit the picture, the
source generates a vertical synchronization signal
(VSYNC). This signal resets the receiver (PC monitor)
so that it begins picture display at the top of the screen.
After the VSYNC signal is sent, the video source
scans the first line of the image. Once the scan line
is complete, the camera generates a horizontal
synchronization signal (HSYNC), which resets the
receiver so that it will display the next line starting
at the left-hand edge of the display. For each line of
the image, a scan line and a horizontal synchronization
pulse are sent. The PCI bus attached to the video
decoder is the access mechanism, or hub, for this video
information traveling to the PC. The need for broadcast
data in the PC is a primary reason analog dedicated PC
television receiver cards are becoming very popular.
The introduction of WebTV for Windows and national
broadcaster support of Vertical Blanking Interval (VBI)
content contribute to addressing the need for a feature
m
What is a PCI Video Decoder?
s
CONEXANT [ CONEXANT SYSTEMS, INC ]
