where can I found hardware to get analog signal from VCR and work with labview and then sample this signal in very high frequency?

[momus]

I am trying to build a Digital Video Recorder using Labview. The problem is that I found that Labview sample the signal in the order of milisecond. I wanted it to be in the order of microseconds. Also I am looking for a cheap Hardware solution if it is possible

[BruceAmmons]

Your question does not make a lot of sense to me, so I will just point out a few things.

1. The PCI-1411 works well with VCR signals. It has a BNC connector as well as a S-Video connector. The price is under $1000, so it is fairly reasonable. The amount of time you save getting it to work with LabVIEW is worth any extra cost.

2. The PCI-1411 is sampling three colors at 30 frames per second, with an image resolution of 640x480. This is the best resolution you are likely to get from a VCR signal. The sampling rate for each byte in the image is about 28 MB/sec. This is in the microsecond range that you are looking for, I think. If you are only interested in the raw signal instead of the image, you could look at the high speed digitizing boards NI sell
s that acquire at higher rates.

If this information isn't really what you were looking for, perhaps you could clarify your question.

Bruce

[Jack_A.]

I'm not sure in which way you would like to record and analyze your video data. Bruce mentioned a good way of analyzing the video through a framegrabber which means you would probably verify the signal is outputting the correct image.

You could also be wanting to analyze the signal levels, such as the SYNC signals. If you want to make these types of measurements, you will need a digitizer of some kind. Check out this link to see some of the high speed digitizer that we offer:

http://sine.ni.com/apps/we/nioc.vp?cid=1464〈=US

They range in sampling rates from 20MS/s to 100 MS/s which will give you samples on the order of nanoseconds.

Jack Arnold
Application Engineer
National Instruments