Sync'd Analog In and Digital In

Hello,
I am a new LV user and am having difficulty with my vi. I'm attempting to use a PXIe-6361 to output hardware timed digital bytes for external multiplexer control for channel select, and then do an analog read of that selected channel. The clock used to control the digital output is synchronized to the analog in read and is running at speeds ranging from 20kHz to 100kHz (manually adjusted in between executions). When this system is running the scope shot looks good (See below...A2 is trigger for AI, and bit lines are the digital mux addresses). The issue I am having is related to filling an array with the samples collected from each channel and replacing them each time they're sampled. The read of the digital output value used for an array column pointer to replace older data does not appear to stay sync'd and causes the data to jump around among various array columns. The VI is attached, any ideas for a fix out there?
Attachments:
Address Scanning & Measuring_single loop.vi ‏98 KB

I just added the Input Buffer vi, set it to 5000 and still see the error. Seems the error is related to the time to collect triggered samples. I am running at 2MHz sample clock rate and when the sample size get sets to approx 50 or smaller the error shows up. This would be when the total sample time is 25uS or faster.
Attachments:
Buffer Error.png ‏20 KB

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Can we acquire the Analog input and Digital Input at

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Hi Chenchen,
It usually simplifies things greatly if you use analog inputs to monitor both the analog signals AND the digital signals.
If you abosulutely HAVE to use digital lines, then the answer is, DEPENDS....
With the correct hardware and depending on how fast you want to collect data and how closely the measurements have to be syncronized in time, it can be done.
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Djokes wrote:
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then we'd have to start a new topic called what is accurate:-))) Anyway, listening to a guy playing an acoustic guitar live would by many be considered a true source of audio.... So if we have a mic that can actually capture the movements the gas molecules in air makes and translate those correctly into currents - then we can assume that at least the mic is giving us the true source...If the mic "Which it cant" could translate the audio one 100 percent accurately into current the mixing board would only "see" current actually VOLTS and treat those as such...if we were to apply no eqs and no effect at all - the next step of inaccuracy would be your speakers which would have to translate the currents and make the membranes vibrate - which would then again compress and rare-fact the gas molecules in the air - thus making u able to hear it....
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What do we hear - and what is there and what is our brain doing.....
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There's a lot more to it than what I just described - and it is quite interesting - If u go to amazon.com there are two kind a books about his stuff...1) The book describing it fragmental like I just did and Books that really describing it according to physics....Latter mentioned are VERY dry but if u take the time and have the interest you will find them real helpful and it will also change the way you "Look" at audio and mixing and recording
This is a huge topic consuming man since the day of recording audio...
analog |ˈanlˌôg; -ˌäg| (also analogue) noun a person or thing seen as comparable to another : the idea that the fertilized egg contains a miniature analog of every adult structure. • Chemistry a compound with a molecular structure closely similar to that of another.
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Error -89137 occurred at DAQmx Start Task.vi:3
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Source Terminal: PXIe_Clk100
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Attachments:
Export Waveforms To Spreadsheet File (1D)_wo extra line.vi ‏33 KB
Multi-Device Synch-Analog Input-Finite Acq-Analog Start_Claire_wDigitalin.vi ‏105 KB

Hi ClaireJ,
Sounds like a reference clock conflict. This KnowledgeBase (KB) talks about this error when using simultaneous sampling. Also, might want to check the device routes in Measurement and Automation Explorer (MAX) as discussed here. Finally, if you are routing your PFI line over a RTSI connection, this error can occur. This KB discusses it.
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Hi everyone,
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Solved!
Go to Solution.
Attachments:
control_v2_DAQ loop.vi ‏46 KB

Robert, the specific error that I get is:
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Task Name: Heater testing lab digital outputs
This error occurs at the 'DAQmx write.vi' function. I just want to sent one sample per second, for each channel. I would like the producer and consumer loops to each run once every second.
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Attachments:
control_v2_ML_simple.vi ‏83 KB

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I am using the PCI-6110E/6111E with the NI-DAQ software version6.7.Is there a way to record at the same time analog and digital channels?If,ye

s can I have timestamps for each sample?I mean,is there a notion of time information on this board?Finally,is there a way to know ,in the double buffer's case,the number of samples in the halfbuffer which is not full if the acquisition stops by a trigger?.I am using the PCI-6110E/6111E with the NI-DAQ software version6.7.Is there a way to record at the same time analog and digital channels?If,yes can I have timestamps for each sample?I mean,is there a notion of time information on this board?Finally,is there a way to know ,in the double buffer's case,the number of samples in the halfbuffer which is not full if the acquisition
stops by a trigger?.
Thank you for your interest in advance

s can I have timestamps for each sample?I mean,is there a notion of time information on this board?Finally,is there a way to know ,in the double buffer's case,the number of samples in the halfbuffer which is not full if the acquisition stops by a trigger?.PALE wrote:
>
> I am using the PCI-6110E/6111E with the NI-DAQ software version6.7.Is
> there a way to record at the same time analog and digital
> channels?If,yes can I have timestamps for each sample?I mean,is there
> a notion of time information on this board?Finally,is there a way to
> know ,in the double buffer's case,the number of samples in the
> halfbuffer which is not full if the acquisition stops by a trigger?.
Start by looking around the examples that ship with LabVIEW (if you are
using LabVIEW).
Also look around zone.ni.com for general data acquisition information &
examples. A good site.
Mark

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Send out analog and digital signal simultaneously ?

Is there any way to send out an analog signal and a digital signal at
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Sent via Deja.com http://www.deja.com/
Share what you know. Learn what you don't.

You went a little too far. the while loop I was talking about was the one around the digital write. You've now taken the digital write completely out of the loop and closing it. You can't do anything with the digital when the analog in is running. You've also closed the analog write while the analog in is running. The attached is more like what I was talking about.
Even with the diagram cleaned up, it sounds like you still have a problem. I don't know the details of your hardware setup but I would start by looking at the analog signal you are generating and verifying that it is correct to your hardware. It would help if you had a scope to troubleshoot. If the signal is correct to the hardware, then trace it through to the connection to the DAQ's analog input. If it's correct there and you still don't see the signal, then you may have wired up the DAQ incorrectly. You haven't specified the connection type (differential, RSE, etc) and I believe it will default to differential.
Attachments:
Single Channelv 2_mod.vi ‏535 KB

Analog Signal to Digital a Primer

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When done, one closes the Capture module, and then navigates to the location that these DV-AVI Type II files have been stored in, and Imports them into the Project. This differs slightly from doing the Capture from a miniDV tape camera, as those Captured files are already in the Project.
Edit away, and Export/Share to the necessary output settings, file type and CODEC.
What about those VHS - DVD decks, the ones that will burn a DVD directly from the VHS tape? They seem so simple to use, and for the most part are. However, those DVD-Video discs, contain pretty heavily-compressed MPEG-2 AV streams. These MPEG-2's, besides being compressed, are in aGOP structure and are muxed (Multiplexed into one file with both a Video & Audio stream), plus there is often some Menus and navigation in the first VOB, the main container components of a DVD-Video. Many NLE’s can Import the VOB’s, and basically rip the MPEG-2 out of them, but that first VOB can be highly problematic, due to the way that most of those decks do the Menus and navigation. It is seldom 100% DVD-compliant by the DVD-specs. This can be a major problem. This ARTICLE will give you some background and tips on DVD VOB's.
Those dual-decks are good for doing one thing, regarding the DVD’s that they produce - provide one with an archival DVD-Video of the VHS tape, and not to be edited. However, the VHS side of these works well with an A-D bridge, just like a pure VHS deck does. I would strongly recommend that one does NOT use the DVD-Video portion of these, if editing will be desired. They cause many more problems, than they solve - just use them for an “archive” copy of the tape to a DVD-Video, for playback on a computer via DVD software or a set-top player, hooked to a TV.
What about film? Well, film is obviously analog, and one needs to digitize this to edit on the computer. The process of this digitizing is referred to as telecineing the film. While one can buy equipment to do this, it is expensive, and involves a lot of setup and testing to get the job done. There are many service bureaus, that offer telecining. Some are better than others. The main considerations are: care in handling of fragile film, how the telecining is done, i.e. frame by frame w/ a liquid gate, or just by straight projection, and then output format for the digitized files. Some of these services will offer a DVD-Video disc. Do not be tempted to do this. See above. Others will offer to write these digitized files to a miniDV tape, and this is just fine. One does then need a miniDV camera, or miniDV tape deck, to then do the Capture from, but the quality and editability will be preserved. The final delivery format would be to put these DV-AVI Type II files onto an external HDD. This saves one from having to do the Capture from miniDV tape, having to have a miniDV camera, or miniDV deck, and only Importing of those files would be required to get them into the Project. Many of these service bureaus will either sell you the external, or use one provided to them. Check out specifications for things like format of the external. FAT-32 will limit the file sizes to ~ 4GB max, and NTSF will have no such limitations. However, if the service bureau is on Mac, and you’re on the PC, their Mac’s can ONLY see FAT-32 HDD’s. Talk this over with the service bureau first, so that there are no surprises later on.
Hope that this helps,
Hunt
PS - also see this FAQ Entry for more detail.

the_wine_snob wrote:
Products, like the Dazzle lineup, just do not seem to work, or work well. I would avoid such.
Although I now have a Canopus ADVC300 I previously used a Magix 'Movies on DVD' USB device. I found the results from this to be particularly good and, to my ageing eyes, I see very little quality difference.
I think this is because Magix use their proprietary high quality codec (from their Pro products) to capture the footage. Like DV-AVI it runs around 10GB+ per hour. This can then, very simply, be exported to DV-AVI Type 2 for use in PRE. Note that there are some sound synchronisation issues with the 'out of the box' settings - but the fix is quick and I posted details to the Magix forum.
Would I revert if I could return my ADVC300 bridge? Probably not - the firewire connection and the PC seeing the box as a camcorder adds to ease of use. In fact I am pleased to have both. There are some things Magix does better than PRE7 (batch exporting each scene as an individual DV-AVI file being just one) and it has smart-rendering which is handy for quick clip splitting/exporting.
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When converting analog video to digital to my macbook the audio desyncs halfway through. Any ideas?

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Hi Rick,
I am extracting the material from the dvd directly using handbrake. The file that handbrake creates lands on the desktop. I then ammend the end of the filename from mp4 to m4v. Following this I click and drag the file onto the itunes icon in the dock. I can then download it to the ipod no problem. The dropouts occur no matter where I play the file. In other words, on the desktop (with QT), in the itunes library and on the pod.
I went back and looked at all the dvd's that are giving me this trouble. The culprit seems to be that the audio signal is in LPCM (linear pulse code modulation). Just for the **** of it, I tried to rip one track using handbrake changing the sampling rate of the audio to 48,000 Hz which I believe is what LPCM uses (previously I had set it at 41,000 Hz in handbrake). But no go, still has dropouts. One of these problem dvd's has a second audio option in AC3 (2ch). As a test, I ripped one song using that. Dropouts are gone. However, the audio is a director's commentary (on the music video he shot) with the music in the background, so it's not what I want.
Is there any way to convert LPCM to AC3? Or any other way to fix this dropout problem.
Thanks,
Pete

How to acquire analog signal and send a TTL pulse at the same time based on PXI 6123

Hi,
I am using a PXI-6123 data acquisition card, as the picture show in the attachment ,I want to acquire the analog signal of ai0 through reference analog window and at the same time send a TTL signal to trigger my camera. I have tried two methods, one is using the DAQmx Export signal.vi another is using DAQmx connect terminals, but when the data acquisition card acquire the analog signal, the DAQmx Export signal.vi and the DAQmx connect terminals sometime can send an TTL pulse ,sometime can not.
I don’t know why? or some other method that can achieve my arm is appreciated.
Regards
chunlei
Attachments:
method export signal.vi ‏21 KB
method connect terminal.vi ‏36 KB
Send a TTL pulse.JPG ‏288 KB

Hi,
Have things changed over the years?
I need to syncronise a digital output (Modul NI9474) and an analoge input (AI-Modul NI9203) module. I need to measure time intervals from a flank in signal A to a flank in signal B. I would like accuracies of the order of 1 ms. Currently, the signals are not synchronised, with errors of the order of 2 times the block length (block size x sample rate), sometimes much higher. The best I got so far was a block size of around 20 with a sample rate of 1 kHz.
If I use the master and slave settings on the RTSL settings, my program doesn't run properly.
If I use digital signals for input and output, I can syncronise them with RTSL settings and everything is good, but I can't always do that.
Also, if I do anything in the GUI (such as scrollowing something or going to another window), my output gets screwed up properly.
1. What can be done to synchronise AI with DO?
2. Is there something that can be done to avoid messing up the output when something happens in the user interface? (I know that I am messing up the outputs as they make some valves switch and that is loud).
Thanks in advance!

Sync'd Analog In and Digital In

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