06-08-2019, 12:09 PM
Hi Jeffrey
I gave it a quick lash up on a Hedghog II to see would the TVP5150 produce anything sensible.
I changed the video decoder clock to 9.272876 MHz.
I just separated the luminance and sent it directly across to the 405 side.
As the video clock from the decoder would be no longer 27 MHz I temporarily derived the 405 line clock from the 50 MHz clock.
I viewed the result on a 405 TV.
I cant believe it but the TVP5150 works!
The picture is floating horizontally and vertically as I haven't synced it at all but the result is very good
In the pictures below of the result the 405 video is supplied by another Hedghog. What is displayed is the 405 video straight out of the decoder and not converted to 625.
The first photo is the Hedghog test card. The second is test card C supplied from a Free view box. In the third picture the embedded syncs can be seen as two vertical lines.
Frank
I gave it a quick lash up on a Hedghog II to see would the TVP5150 produce anything sensible.
I changed the video decoder clock to 9.272876 MHz.
I just separated the luminance and sent it directly across to the 405 side.
As the video clock from the decoder would be no longer 27 MHz I temporarily derived the 405 line clock from the 50 MHz clock.
I viewed the result on a 405 TV.
I cant believe it but the TVP5150 works!
The picture is floating horizontally and vertically as I haven't synced it at all but the result is very good
In the pictures below of the result the 405 video is supplied by another Hedghog. What is displayed is the 405 video straight out of the decoder and not converted to 625.
The first photo is the Hedghog test card. The second is test card C supplied from a Free view box. In the third picture the embedded syncs can be seen as two vertical lines.
Frank
