Quote:
Originally Posted by jhalphen
Hi to All,
Hi Alex KL-1,
Took me time to mull over what you are trying to achieve & understand better.
The Sony CXA1645M datasheet is interesting (Thanks!).
Apparently it encodes RGB to either standard 3.58 NTSC or 4.43 PAL.
to operate in Brazil Wikipedia describes the PAL-M subcarrier as :
"Exact colour subcarrier frequency of PAL-M is 3.575611 MHz"
from WK:
https://en.wikipedia.org/wiki/PAL#PAL-M_(Brazil)
You wrote:
"In fact, in theory I can convert the C signal from S-Video from NTSC for PAL-M"
I don't agree, the NTSC color component does not have the essential PAL alternation (swinging burst) & alternate line reversed R-Y component which is the heart of PAL.
To convert, you must decode NTSC to RGB or Y/B-Y/R-Y then re-encode in PAL system.
Only the subcarrier frequency is different between 4.43 Euro PAL & Brazil PAL-M.
We need to know more about what you want to achieve, this is what i understand:
Source #1 a computer with S-Video Composite out.
Source #2 would be what?
- Off air brazilian TV (digital). Set top box outputs what standard; NTSC or PAL?
- DVD ? standard PAL or NTSC out (i guess)
Source #3, streaming from NetFlix or other local streaming services?
Decoding to RGB 525/60 then re-encoding to PAL-M seems logical.
This appears to be a solution for your other sources:
"Interesting the VHD-180; for me, solves my problem, since I have another notebook and a PC with VGA"
About your relative with old (color?) TV: Brand/model/age
what signals can the TV receive:
- Off air PAL-M (VHF/UHF) only
- single standard PAL-M only or compatible with NTSC USA or PAL 625
- does it have an A/V input of Euro-type SCART connector?
It could work with the Sony RGB to PAL-M encoder + a RF Modulator to TV's antenna input. There are relatively cheap models which do all world standards such as the Terra MT-47, see enclosed data sheet. Full pdf manual downloadable here:
https://www.terraelectronics.com/pro...dulators/mt47/
Best Regards
jhalphen
Paris/France |
Sorry...
Long time has passed; I don't know but I simply not noted if the notification about message not read not appeared or simply I don't see (much more probable), but... never later than never...
In fact, I have 2 objectives here:
1 - to find a spare device for my laptop, preferably with image quality like a Playstation 2 (to me the best S-Video quality I've used om my TV's), so quality is a must here;
2 - to find an alternative to my relative (el-cheap alternative); more on that below.
"In fact, in theory I can convert the C signal from S-Video from NTSC for PAL-M"
I don't agree, the NTSC color component does not have the essential PAL alternation (swinging burst) & alternate line reversed R-Y component which is the heart of PAL.
To convert, you must decode NTSC to RGB or Y/B-Y/R-Y then re-encode in PAL system.
Yes, that is the idea, your description was far better than mine
About the devices:
"We need to know more about what you want to achieve, this is what i understand:
Source #1 a computer with S-Video Composite out."
This is my personal solution, the laptop with S-Video mentioned.
My relative don't have this option.
"Source #2 would be what?
- Off air brazilian TV (digital). Set top box outputs what standard; NTSC or PAL?
- DVD ? standard PAL or NTSC out (i guess)"
These sources are ok for me; I have a DVD player and a ISDB-TV decoder, since all of it already have native PAL-M. My relative don't have interest in these sources.
"Source #3, streaming from NetFlix or other local streaming services?"
In my case, is same as Source 1. But, my relative wants to use some modern streaming "receiver" device like ChromeCast, or even her laptop, having only HDMI out.
"Decoding to RGB 525/60 then re-encoding to PAL-M seems logical.
This appears to be a solution for your other sources:
"Interesting the VHD-180; for me, solves my problem, since I have another notebook and a PC with VGA
About your relative with old (color?) TV: Brand/model/age
what signals can the TV receive:
- Off air PAL-M (VHF/UHF) only
- single standard PAL-M only or compatible with NTSC USA or PAL 625
- does it have an A/V input of Euro-type SCART connector?"
This is a brazilian Toshiba using Philips TDA3561 video processor. originally it only has off air input as usual, but I already made a S-Video input switch, and I can even can make a RGB input (like SCART) if needed (inputs with proper isolation trafo, since is a live chassis...). This will produces a lot of options, and this will simplifies in theory, but is difficult to find a "el-cheapo" converter having 480i RGB output, or even S-Video; is outside of her budget. I found various cheap 480p converters, completely useless for this case.
I even studied the Philips cousin NTSC processor, to change in place of PAL decoder, but pinout is radically different. Too much hard work...
"It could work with the Sony RGB to PAL-M encoder + a RF Modulator to TV's antenna input. There are relatively cheap models which do all world standards such as the Terra MT-47, see enclosed data sheet. Full pdf manual downloadable here:
https://www.terraelectronics.com/pro...dulators/mt47/"
Interesting versatile modulator! Thanks for the tip; wil be very useful if someone request me a RF quality solution.
Best Regards,
Alexandre