ATI 9700 AIW PAL-Nc incompatibility


P

Pioneer

My problem is that I can't for example watch TV or capture from video
input (composite) with PAL-N (which is the video standard in
Argentina).
This doesn't occur in NTSC mode when recording from a Camera or VCR.
So the card works correctly with NTSC standard. The manual states that
it suppose
to be compatible with PAL-N and PAL-M !!!! (Argentina and Brazil TV
Standard)
According to what I read there are 2 standards for ATI
(NTSC, PAL-M , PAL-N) and a (PAL/SECAM) version.

ATI states in the manual and on the official web site
(http://mirror.ati.com/products/radeon9700/aiw9700pro/specs.html)
that my card should be compatible with PAL-N TV Standard.



I've tried with a PAL-N to PAL-B transcoder and the card worked
correctly.
I've got a NTSC version that theorically works only with NTSC
according to ATI SUPPORT, so how do they explain what I have said
before.

Finally I have made a research myself and I found out that Argentina
uses a modified PAL standard called "PAL-Nc" that differs from PAL-N
used by Paraguay and Uruguay

PAL (N)
Line/Field = 625/50
FH = 15.625 khz
FV = 50 Hz
FSC = 4.43361875 Mhz
Blanking Setup = 7.5 IRE
Video Bandwidth = 5.0 Mhz
Audio Carrier = 5.5 Mhz
Channel Bandwidth = 6 Mhz

PAL (Combination N)
Line/Field = 625/50
FH = 15.625 khz
FV = 50 Hz
FSC = 3.58205625 Mhz (Burst Frequency)
Blanking Setup = 0 IRE
Video Bandwidth = 4.2 Mhz
Audio Carrier = 4.5 Mhz
Channel Bandwidth = 6 Mhz

Sound Issue:
When selecting NTSC as TV Standard the sound is correct because PAL-Nc
uses the same Audio Carrier (4.5 Mhz)


I suppose that's the reason why the ATI Radeon 9700 AIW doesn't work
in Argentina Television standard.

FSC = color subcarrier frequency
Burst (Color)
A color reference signal included as part of the overall composite
video signal. Eight to ten cycles of color sub-carrier (3.579545 MHz,
often abbreviated as 3.58) are inserted before the start of every
horizontal line. It can be seen just following the H sync pulse in the
H blanking interval. It provides color-synchronizing information for
the color decoding circuits in monitors, receivers and other TV
equipment.


Blanking setup:
The video signal level corresponding to black areas in a scene. For a
composite signal, black is standardized at +7.5 units as viewed on a
waveform monitor IRE scale. This elevated black level is often
referred as "setup" and serves as a guard band between video and sync.
For component video, black is at 0 units. The video level immediately
preceding or following horizontal sync exclusive of the active video
region. The video level for blanking is defined as 0 IRE. In the case
of PAL,blanking level and black level are the same.

There are two versions of PAL-N. As far as I can tell the
difference is the vertcal sync duration (5 or 6 lines), and some pulse
width differences.

There are LOTS of small differences between the two versions of PAL N,
all in the scan/blanking parameters. Field blanking is one such,
mostly 19-25H but 25H in Argentina.
 
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C

Cristian

I've the same exact problem with a AIW 9000 Pro working in Argentina.
It seems ATI people doesn't know of this "small" differences of the
standard; but they explicitly state in their product that the NTSC version
supports PAL standard like the one in Argentina (the country is
especifically mentioned).
No answer from ATI about this fact.
Regards,
Cristian.
 

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