What models of DAQ would allow for capturing of analog composite video and playback?

[Bill0879]

I'm looking to do a simple capture of an analog composite video signal for 10 seconds and to save the sample. I then need the ability to play the captured composite video sample captured back again as analog to test vintage video equipment. The purpose of this is to test all equipment with an identical starting signal. What models of DAQ (either past or present) allow me to do that most easily with hardware and drivers that are still readily available? I do not need the DAQ to have any special features beyond that task. Thanks in advance!

[santo_13]

This may give some idea - https://forums.ni.com/t5/LabVIEW/Analog-Composite-Video-Acquisition-and-Data-Synchronization/td-p/17...

https://www.ti.com/lit/an/slyt138/slyt138.pdf?ts=1710998310712&ref_url=https%253A%252F%252Fwww.googl...

[Harvey_was_in_NI]

That's an interesting application. Just share my 2 cents.

1. I look into the composite video signal. In the signal definition on WIKIPEDIA, it shows the reference black (0.339V) to reference white (1V) would be divided to 256 LSB. That means the DAQ resolution must higher than that (0.661 @ 8bit), which is around 2.582 mV. I am thinking 16 bit hardware should be fine. But I guess it might be much higher than that to record it correctly. 
2. Regarding to the sampling requirement, I found this article which indicates there are fast-scan and slow-scan signal. It may need 3 kHz - 6 MHz bandwidth. For slow one, it may work once you confirm the data rate requirement. However, for 6 MHz, I think you may need hardware like scope with appropriate range and probe configuration. I believe it could be done by scope. If you consider the pre-owned, which you could find some here: Home | NI Trading Post (freeforums.net)

[Bill0879]

Many thanks for the replies! My budget would probably be $500 for used equipment, so wondering what the most readily available/reliable/highest sampling rate equipment might be for that. Ideally would want something easy to use as well as I'm really just looking to capture a short clip and be able to replay it back at the highest sampling rate. I'd rather err on something that is overspec'ed for capture than something underspec'ed. 

Any specific model numbers that would meet that criteria? I'm a total novice when it comes to DAQs, so my apologies for what probably seem like very basic questions haha. 

Thanks!