How to convert a analog signal to digital signal

Hello,
How to convert an analog signal into digital signal such that every sample of analog signal corresponding to 1.2V will be represented as '1' in digital signal and other samples of analog signal(that are not 1.2v) will be represented(converted) as '0' in digital signal.
And how to display both wavefroms or signals in graph indicators.
Thanks.
Solved!
Go to Solution.

If you have 1000 samples, and you want to convert to digital, you are going to get 1000 digital values. Attached is what I mean.
Unofficial Forum Rules and Guidelines - Hooovahh - LabVIEW Overlord
If 10 out of 10 experts in any field say something is bad, you should probably take their opinion seriously.
Attachments:
Analog_to_Digital Hooovahh Edit.vi ‏52 KB

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Converting analog signals into digital signals

I have been transferring analog video cassettes to iMovie for further editing by using a digital camcorder (Canon MV960) between the 8mm video camcorder (analog camcorder) and iMac. I have always done this without any cassette in the digital camcorder, i.e. I have been using the digital camcorder as an analog/digital converter only.
I recently acquired iMovie HD 6 but this most recent version of iMovie refuses to import any signal from the analog camcorder via the digital camcorder. The window in iMovie is empty with an error message saying that "no tape". Well, it's true, there is no tape, there never was any tape when I used the previous version of iMovie!
Does this mean that I have to convert the analog video tape into digital video tape and, once recorded in digital format, the digital tape can be imported in iMovie HD 6?
All cable connections are OK:
- the analog film could be seen in the screen of the digital camcorder:
- digital video tape could be imported to iMovie HD 6.

Hi 5480:
try running a permissions repair (which should actually be done before and after upgrading software). You will find it in applications / utility / disk utility.
Also, this is a copy of how Matti Haveri (iMovie Guru) sets up analoge to DV:
My Analog to DV passthrough settings memo:
1. Take the tape out of the camcorder
2. Connect the analog device's audio and video to the camcorder's minijack, use the S-Video jack for video if the output device supports S-Video
3. Put the camcorder into VTR-mode
4. Select A/V->DV out: ON, in VTR mode's menu choices
5. Disable the info display on the the camcorder by toggling its DISPLAY button
6. Put iMovie (or other DV application) to the Camera Mode
The analog image should now appear on the camcorder's screen as well as on the iMovie's screen.
Note that if you have a tape in the camcorder, you have to put the camcorder's VTR into REC mode (you may pause the tape) but this is not advisable because it produces wear to the tape.
* Note that the SCART which comes with the European nEUtered TRV320E camcorder is Out-only.
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How can i change analog waves into digital waves?

we had labview lab last week.. were doing fine if we have instructions unfortunately the professor will give us an exercise regarding baseband signals spectra.. were trying to download a trial software but we dont have any luck. the question asks for us to change analog waves into digital waves, measure the amplitude of the 5-th harmonic using spectrum analyzer.. i hope you can help me thnx..

After you are successful getting LabVIEW on your computer, put together something to at least show us you're up for learning. Then we can guide you to a solution that you've developed (mostly) on your own.
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Hi all, i have a driver file that outputs the screen capture in XY graph format. I want to measure period using the measurement functions in the LabVIEW palette. Can someone tell me how to convert into this "signal in" type. The X (time) and Y (power) are all there but it creates an error when i wire together?
Please see my attached code.
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Solved!
Go to Solution.
Attachments:
convert XY Graph to Signal In.vi ‏25 KB

Its ok folks, i have found a solution. See attached FYI.
Attachments:
convert XY Graph to Signal In.vi ‏43 KB

How do I use the counter and digital signals of the 6071E while it is connected to SCXI modules?

I am contemplating using a PCI 6071E with SCXI. We have the boards (6071E), we would need the cable (I suppose SH1006868) and the SCXI system. I would like to know how would you access the counter and digital line capabilities of the board. I will be using a SCXI-1314 with a SCXI-1520 Module for strain measurements but will need to use the counter and digital lines of the board as well. Can this be done? If so, how and/or what else do I need?

I think this KnowledgeBase will answer the question for you.
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How to convert old VHS tapes to digital

I am hoping someone can give me an overview of what kind of equipment/software is necessary to convert VHS tapes into a digital format that could be saved in iMovie. Do I just need the right cables for the VCR or something more complicated? Thanks!

I recommend that you download the free iMovie HD6 for those with iMovie 08 who do not have a prior version of iMovie HD6. You can get it here: http://www.apple.com/support/downloads/imovieHD6.html
And, do this tutorial: http://www.apple.com/support/imovie/tutorial/
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+So, your method worked using just a VCR, a camcorder, and your computer? No special converters?+
Yes, I just used the AV connectors that came with my camcorder to hook the camcorder to the VCR....which was in a combo TV/VCR unit so I could see the footage on my tv, just to make it easier. The AV connector cable has a special prong that fits into the camcorder, and those white/red/yellow prongs at the VCR end. The TV/VCR is a few years old, certainly not anything fancy or new.
I didn't bother with a converter since I just used the camcorder.
My computer and that VCR are not physically close enough to try to import directly, and since I wanted the digital tapes of the original footage, recording first to the miniDV tapes worked for me. Canopus makes a couple of nice converters...they are around $150-250, I think.
Then, to connect to the computer with the camcorder you will need a 4-6 pin Firewire cable.
+I might do it sooner or I might put it off for awhile while I practice messing around with iMovie.+
The benefit of recording from VHS to miniDV tapes is that the tapes are digital, they store easily and the footage will not degrade before you get around to creating your iMovies and DVDs. iMovies can take up lots of drive space, so don't be thinking that you will just import them all and save them for editing later. You would need a huge amount of space for this. Most of my movies are just under 2 hours, and occupy between 25-40 GB each. A couple of my movies were well over 100-140GB!!!! Yes, that is correct. I have a couple of external drives that I use for my movies while I am creating them. I usually have about two or three that I am working on at the same time.
+We want to put them in a digital format that will be easier to store and play and safer from eroding over time, so I guess the end format I'm looking for is DVDs.+
Because DVDs can break/crack/warp/melt/etc, you should consider exporting your finished iMovies back to the camcorder so that you have the miniDV tapes for more permanent storage and as a backup to your DVDs.
That is one of the big reasons that I don't use iMovie 08---it does not permit exporting back to a camcorder.
Although I do not save my created iMovies on my computer after I have made the DVD and exported the edited movie back to tape, I do save all my iDVD projects as disk images. A disk image can be up to 4.7 GB--even my large movies were automatically compressed down when put into iDVD. The limitation in iDVD is the total length of the movie in TIME, not SIZE. I use single-layer DVDs, which can hold up to 2 hours of content. Creating disk images allows you to have an exact copy of your iDVD projects, self-contained so that you can delete the original iMovies and the original iDVD projects. You can use the disk image to burn your disks when you first create them, and any time in the future. It is a good backup for the entire DVD.
Enjoy being creative with your movie projects! Post back with any more questions, and feel free to email me if you want.
Regards,
Beverly

Scb-68 and PCI-8331 what is converting my analog sgnal into digital%3F

Long ago, around 7 years ago, I worked on a project in which I interface photodetector to my computer through SCB-68 kit. The SCB-68 kit was connected to computer using PCI-8331 card.
Now, my input was analog signal from photodetector but at programming interface I was getting digital values for computation. Now my confusion about the conversion task done by which part of this connection?
SCB-68 was converting the input signal and supplying digital output? or PCI-8331 was doing digitization before delivering information to computer? or labview itself was doing it after getting signal from PCI-8331?
can anyone please clear me?
Thanks!
Solved!
Go to Solution.

The scb-68 is just a dumb terminal block. The pci-8331 is http://sine.ni.com/nips/cds/view/p/lang/en/nid/13179 and does not connect to photodetectors so your memory is flawed about the part number. An actual DAQ card would have done the conversion.

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from signal generation VIs you get arrays containing float values (aka DBL). Those floats are just digital values made of 0s and 1s…
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To provide a solution you need to rephrase your question! What exactly do you expect as result of your operation?
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duplicate post

Can i convert a wav file to a digital signal without using DAQ?

i tried the coversion of a sine wave to digital signal, ofcourse it doesnt work on converting wav file to a digital signal. i am also new in labview. i tried to explore it but there are many functions that i can't use.
so my these are my questions.
1) is a .wav file is an analog signal?
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tnx guys! i'll post the programs that uses quantization of a simple sine wave. i tried it to .wav file but it didnt work.
Attachments:
act04-02.vi ‏41 KB

.WAV is a digital "signal". It uses Pulse Code Modulation to encode analog signal. You don't need a DAQ device to "convert" it to analog. Any computer with a sound card, and media player can "convert" a .wav file to the analog audio signal it represents
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I'm not sure that I really understand the question
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How to convert digital signal to analog

Hi..
I am using NI 9375 (DIO module) to read the output from flow sensor.
The output of the flow sensor is in the digital signal.(Boolean=True/False).
How can I convert the digital signal to the analog to get the reading of the flow sensor?
I had tried before to convert the digital signal to the frequency so that I can make the conversion from frequency to the flowsensor reading,
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nhan91213 wrote:
Hi..
I am using NI 9375 (DIO module) to read the output from flow sensor.
The output of the flow sensor is in the digital signal.(Boolean=True/False).
How can I convert the digital signal to the analog to get the reading of the flow sensor?
I had tried before to convert the digital signal to the frequency so that I can make the conversion from frequency to the flowsensor reading,
but it doesn't work.( I am referring to http://www.ni.com/white-paper/14549/en/ ).
FYI - If your flowmeter pulsing frequency is higher than 500Hz then you won't get reliable reading using your algorithm, and it will be very unreliable above 1kHz because fastest that loop runs is 1mS (1kHz). In that case you could tie the timed loop to a higher rate (hardware) clock source to go faster than 1mSec loop time. If no hardware then I think you can use high resolution timer (in LV2014, not sure if it was also available in previous version) and a regular while loop with algorithm modification for a faster timing.
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How to convert a analog signal to digital signal

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