analogue composite to hdmi and lock signal
Posted: Fri Aug 15, 2025 6:39 am
Hi guys, yet another question.
This is one I've solved in the past but have lost the 'recipe'.
I need to convert an analogue video signal from a FM rx to HDMI and generate a lock / signal present signal.
In the past I think I used an LM1881 plus 567 PLL chip for the lock signal.
Now perhaps I should use a RPI plus a usb video dongle for the conversion and some external signal detection for the lock signal.
I do have a cheap composite to HDMI converter but yet to determine how well it works with a noisy signal but would still need to generate a reliable lock signal.
Any comments / ideas ?
Regards Tim
This is one I've solved in the past but have lost the 'recipe'.
I need to convert an analogue video signal from a FM rx to HDMI and generate a lock / signal present signal.
In the past I think I used an LM1881 plus 567 PLL chip for the lock signal.
Now perhaps I should use a RPI plus a usb video dongle for the conversion and some external signal detection for the lock signal.
I do have a cheap composite to HDMI converter but yet to determine how well it works with a noisy signal but would still need to generate a reliable lock signal.
Any comments / ideas ?
Regards Tim