Pitbuell94
Newbie level 6
- Joined
- Mar 19, 2010
- Messages
- 13
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- Location
- France, fresnes
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- 1,413
Hi everybody,
I'm trying to make a video scaler using normal video signal PAL or SECAM 625 horizontal lignes at 50 frames per second and convert it to an other format but always for Cathodic TV.
In fact, my hobby is to repair very old TV using vaccum tubes technologie.
So, I repair actually olds tv with 819 lignes definition.
The problem here is there is no more TV emetter with this kind of resolution so I need to make a brand new one to run again my old TV.
Just for your information, in France René Barthélemy develops the definition of 819 TV lines. During the years of occupation, in 1944, Barthelemy reached 1015 and even 1042 lines in Black and White.
All these TV from stoneage are in black and white.
So my idea is first to take the video signal( CVBS) PAl or SECAM, to keep out the colour with analog filter ( CHROMA information at 4.43 MHz), to convert this B&W video signal with a TDA 8708 > obtain a 8 bit luminance information> make calculation of missing lines and convert again in CVBS signal.
All the synchro signal come from a TDA1881.
My problem is that the scan rate is different between the 2 standarts.
IN video signal is 625 lines @50Hz
OUT video signal is 819 lines @50Hz.
First, to be sure my Spartan 3E-500 is able to do it, I just want to make a test and not directly design a full video converter.
I just want to sent to my B&W tv a signal with black and white horizontal and vertical stripes.
See photos.
Does someone try to do a soft to drive actual TV with video signal?
Thanks for your comments.
Pitbuell94.
I'm trying to make a video scaler using normal video signal PAL or SECAM 625 horizontal lignes at 50 frames per second and convert it to an other format but always for Cathodic TV.
In fact, my hobby is to repair very old TV using vaccum tubes technologie.
So, I repair actually olds tv with 819 lignes definition.
The problem here is there is no more TV emetter with this kind of resolution so I need to make a brand new one to run again my old TV.
Just for your information, in France René Barthélemy develops the definition of 819 TV lines. During the years of occupation, in 1944, Barthelemy reached 1015 and even 1042 lines in Black and White.
All these TV from stoneage are in black and white.
So my idea is first to take the video signal( CVBS) PAl or SECAM, to keep out the colour with analog filter ( CHROMA information at 4.43 MHz), to convert this B&W video signal with a TDA 8708 > obtain a 8 bit luminance information> make calculation of missing lines and convert again in CVBS signal.
All the synchro signal come from a TDA1881.
My problem is that the scan rate is different between the 2 standarts.
IN video signal is 625 lines @50Hz
OUT video signal is 819 lines @50Hz.
First, to be sure my Spartan 3E-500 is able to do it, I just want to make a test and not directly design a full video converter.
I just want to sent to my B&W tv a signal with black and white horizontal and vertical stripes.
See photos.
Does someone try to do a soft to drive actual TV with video signal?
Thanks for your comments.
Pitbuell94.