
2002 Dec 17
32
Philips Semiconductors
Product specification
PCI audio and video broadcast decoder
SAA7134HL
handbook, full pagewidth
MHB999
R
G
B
Y
U
V
YUV
to
RGB
matrix
R
G
B
Y
U
V
RGB
to
YUV
matrix
three channel non-linear transformation
Fig.15 Colour space conversion and look-up table.
7.6.9
V
IDEO PORT
, ITU
AND
VIP
CODES
The decoded and/or scaled video stream can be captured
via PCI-DMA to the system memory, and/or can be made
available locally through the video side port (VP), using
some of the GPIO pins. Two types of applications are
intended:
Streaming real-time video to a video side port at the
VGA card, e.g. via ribbon cable over the top
Feeding video stream to a local MPEG compression
device on the same PCI board, e.g. for time shift viewing
applications.
The video port of the SAA7134HL supports the following
8 and 16-bit wide YUV video signalling standards
(see Table 7):
VMI: 8-bit wide data stream, clocked by LLC = 27 MHz,
with discrete sync signals HSYNC, VSYNC and
VACTIVE
ITU-R BT.656, parallel: 8-bit wide data stream, clocked
by LLC = 27 MHz, synchronization coded in SAV and
EAV codes
VIP 1.1 and 2.0: 8-bit or 16-bit wide data stream,
clocked by LLC = 27 MHz, synchronization coded in
SAV and EAV codes (with VIP extensions)
Zoom Video (ZV): 16-bit wide pixel stream, clocked by
LLC/2 = 13.5 MHz, with discrete sync signals HSYNC
and VSYNC
ITU-R BT.601 direct (DMSD): 16-bit wide pixel stream,
clocked by LLC = 27 MHz, with discrete sync signals
HSYNC, VSYNC/FID and CREF
Raw DTV/DVB sample stream: 9-bit wide data, clocked
with a copy of signal X_CLK_IN.
The VIP standard can transport scaled video and
discontinuous data stream by allowing the insertion of ‘00’
as marker for empty clock cycles. For the other video port
standards, a data valid flag or gated clock can be applied.
7.7
TV sound
7.7.1
TV
SOUND STEREO DECODING
TV soundismodulatedonaninternalsoundsubcarrier,on
the upper end of the TV RF channel, at 4.5, 5.5, 6.0,
or 6.5 MHz, depending on the TV system. The modulation
is usually on FM and for system L on AM (see Table 14).
There are basically three variants how stereo sound is
encoded on analog TV transmission:
An internal multiplexed carrier for the difference signal
L
R (BTSC uses AM and EIAJ uses FM); this is similar
to FM radio stereo
A second independent FM carrier in the RF channel
(dual FM), that can carry the difference signal L
R, or
a second language
A (second) independent FM/QPSK carrier in the
RF channel (NICAM), carrying a digital audio signal,
stereo, or dual language mono.
Some parameters of the used coding scheme are
modulated on an inaudible pilot carrier.
The SAA7134HL incorporates TV sound decoding from
the Sound Intermediate Frequency (SIF) signal. The
analog SIF signal is taken from the tuner, digitized and
digitally FM or AM demodulated. The pilot tone is