saa7134hl NXP Semiconductors, saa7134hl Datasheet - Page 29

• Manufacturer Part Number: saa7134hl
• Description: Pci Audio And Video Broadcast Decoder
• Manufacturer: NXP Semiconductors

Philips Semiconductors
SAA7134HL_4
Product data sheet
on full-scale RGB, i.e. 0 to 255, the range can be stretched by applying appropriate
brightness, contrast and saturation values. The look-up table supports gamma correction
(freely definable), and allows other non-linear signal transformation such as black
stretching.
The analog TV signal applies a quite strong gamma pre-compensation (2.2 for NTSC and
2.8 for PAL). As computer monitors exhibit a gamma (around 2.5), the difference between
gamma pre-compensation and actual screen gamma has to be corrected, to achieve best
contrast and color impression.
The SAA7134HL offers a multitude of formats to write video streams over the PCI-bus:
YUV and RGB color space, 15-bit, 16-bit, 24-bit and 32-bit representation, packed and
planar formats. For legacy requirements a clipping procedure is implemented, that allows
the definition of eight overlay rectangles. This process can alternatively be used to
associate ‘alpha’ values to the video pixels.
Fig 11. Nominal digital levels for YUV (Y, C
Fig 12. Nominal digital levels for CVBS and raw VBI samples
255
235
128
16
a. Y output range
a. For sources containing 7.5 IRE black
0
255
209
level offset (e.g. NTSC M)
LUMINANCE 100 %
71
60
1
LUMINANCE
SYNC
white
black
Rev. 04 — 31 March 2006
white
black
black shoulder
sync bottom
255
240
212
128
44
16
0
U-COMPONENT
b. U output range (C
B
and C
PCI audio and video broadcast decoder
blue 100 %
blue 75 %
colorless
yellow 75 %
yellow 100 %
255
199
60
R
b. For sources not containing black level
1
) in accordance with ITU-R BT.601
offset
LUMINANCE
B
)
SYNC
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
255
240
212
128
44
16
0
SAA7134HL
V-COMPONENT
c. V output range (C
white
black shoulder = black
sync bottom
mgd700
red 100 %
red 75 %
colorless
cyan 75 %
cyan 100 %
001aae766
29 of 51
R
)