Acquisitions de données analog et digital sur le même front montant TTL

Bonjour, j'ai une question assez urgente à vous poser.
Est'il possible de faire une acquisition des données d'un signal digital et d'un signal analogique simultanées triggées par le même top TTL?
Je cherche un Daqpad capable de faire cela, et je n'ai pas trouvé plus d'informations sur ce site.
Merci d'avance!

Bonjour Valaphone,
Il est effectivement possible de le faire.
Voici deux exemples de VI permettant de synchroniser une AI et DI et de faire un trigger numérique:
Synchronize AI & DI
Digital Trigger
Concernant le DAQPad, je vous laisse prendre contact avec l'un de nos ingénieurs commerciaux au 01 57 66 24 24.
Bonne journée
Cindy
Cindy

Similar Messages

Aide urgent: Acquisition des données analogiques sur Labview

Bonjour,
Je voulais savoir si je peux utiliser plusieurs modules de NI 9219 sur un même chassis NI cDAQ-9174.
L'acquisition des données ( déformations: entrées analogiques) se fait par l'intermédiaire du logiciel Labview Signal Express 2013.
Je pose cette question parce que j'ai essayé d'utiliser deux cartes différentes NI 9219 et NI 6210 et j'ai obtenu une erreur.
Merci de me répondre,
Résolu !
Accéder à la solution.

Bonjour Eloise,
Merci pour votre réponse. L'erreur est 201426. J'ai joint l'impime écran de cette erreur.
J'ai une autre question pour vous si ca ne vous dérange pas! Lorsque je fais mon acquisition avec USB-6210 j'ai un bruit énorme au niveau des courbes. J'ai cherché la solution de ce problème, j'ai trouvé que cette carte d'acquisition ne fonctionne pas sur Windows XP. J'ai changé le système d'exploitation à windows 7 mais le problème persiste.
Même si je fesais l'acquisition sans manip j'ai des fluctuations.
Je vous remercie pour votre disponibilité,
M.A.H
Pièces jointes :
Nouveau Image bitmap.jpg ‏366 KB

Fréquence d'acquisition de données sur un châssis NI DAQmx

Bonjour,
je suis un étudiant en stage. Ma mission consiste à réaliser un système d'acquisition de données sur le logiciel Labview 8.5. J'utilise
un châssis NI DAQmx équipé d'un controleur PXI 8105 et de 5 cartes série M: 4 cartes 6225 et une carte 6254. J'ai un problème au niveeau de mes
fréquences d'acquisition. Je n'arrive pas à acquérir des données sur une longue période sans que le système affiche une erreur. L'autre problème
est la vitesse d'acquisition des données. Etant dans le domaine de haute performance, je dois acquérir des données à des vitesses de l'ordre de 20kHz
mais mon programme ne tolère pas de vitesse au dessus de 1kHz. Ma vitesse se situe aux alentours d'une centaine de Hz.
Avez-vous une solution à me proposer?
Je vous remercie d'avance.

Bonjour,
Vous pouvez effectuer le traitement des données dans une boucle séparée de la boucle dédiée à l'acquisition. Ainsi votre traitement lent ne limitera pas l'acquisition.
Vous pouvez réaliser ceci grâce à une architecture type producteur/consommateur.
Vous pouvez trouver des exemples de cette architecture dans Aide>>Recherche d'exemple.. ainsi que des templates de projet pour cette architecture.
Cordialement,
Isabelle G.
National Instruments France
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Été de LabVIEW 2014
12 présentations en ligne, du 30 juin au 18 juillet

Problème d'acquisition et de traitement de donnée analogique

Bonjour,
Je dois faire l'acquisition de données provenant d'un encodeur angulaire ( pour mesurer la position d'un pendule) avec une carte NI PCI-6013 je prend mes données sur N échantillons à raison de 5000 échantillons à une fréquence de 50kHz. Je dois donc afficher l'angle en continue et si l'utilisateur le souhaite enregistrer, au temps souhaité et à une fréquence de : 10,100,1000,10000 Khz, la position en fonction du temps. Tout marche bien pour afficher l'angle en continue mais voilà dès que j'enregistre et que j'affiche le graphe en fonction du temps les données sont saccadées ( print screen en pièce jointe).
Je suis débutant sur labview et c'est la première fois que je fais de l'acquisition. Je met mon vi en pièce jointe toute remarque est bonne à prendre ne serais-ce que pour simplifier mon programme.
Je vous remercie d'avance
Pièces jointes :
Pendulesimple2012.JPG ‏136 KB
PenduleSimple2012V1.01.vi ‏73 KB

Bonjour Plantes,
Dans votre programme, vous utilisez un assistant DAQ en échantillonnage fini, intégré dans une boucle While, certainement pour faire de l'acquisition en continue.
Pourquoi ne pas utiliser directement un échantillonnage continu?
Votre problème est certainement lié à la manière dont vous construisez vos tableaux (de manière dynamique), ce faisant LabVIEW à besoin de faire des réallocations mémoire constante pour remplir ces tableaux. Ce qui engendre un temps qui aura tendance à augmenter tout le long de l'exécution de votre application.
Aussi, le fait de passer de gros tableaux à votre Graph XY, demande du temps à LabVIEW pour rafraichir votre FaceAvant ce qui peut donner cette sensation de saccade.
Pour éviter cela, je vous encourage à utiliser une structure producteur/consommateur décrite ci-après. Cette Architecture permet de faire dans une boucle votre acquisition de données de manière continue ou non, et ensuite de déporter le traitement des données dans une autre boucle (consommatrice). Ce faisant votre acquisition de données n'est pas impactée par le temps de traitement des données.
Ceci étant dit, je vous encourage à prendre connaissance des éléments suivant, qui vous permettrons de mieux comprendre comment fonctionne LabVIEW et comment utiliser de manière efficace la programmation DAQ, et les architectures associées:
1 . Getting Started with NI LabVIEW Student Training
2 . LabVIEW Application Design Patterns
3 . Learn 10 Functions in NI-DAQmx and Handle 80 Percent of Your Data Acquisition Applications
4 . Getting Started with NI-DAQmx: Main Page
Je vous souhaite une bonne journée,
Rémi D.
National Instruments France
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>> Les rencontres techniques de NI - Mesures et acquisition de données : de la théorie à la mise en ...

Analog to Digital (ie VHS to DVD)

As much as I love the internet I think I've overloaded myself with information, lol.
I have some home movies on VHS that I would like to transfer to DVD and have them be compatible with tweaking in iDVD or iMovie (I'm totally new to Mac BTW, I've only had my Macbook Pro for a little over a month).
I know I need to buy a VCR.... this is where my confusion comes in ... should I just buy a VCR/DVD combo (I'm looking at an LG RC797T for $250 @ Best Buy) and record the VHS tapes to a DVD on the machine? Will that video on the newly burned DVD now be digital video that will be importable and editable (are those words?) on my MBP with iDVD and/or iMovie?
Or, do I need to go w/some sort of analog to digital converter? I was looking at purchasing either a Canon Elura 100 Mini-DV or Canon ZR700 Mini-DV camcorder since they do analog to digital conversion (would have to go from VCR, out via S-Video into the Camcorder and then out of the Camcorder via Firewire into the Mac (actually an external HDD will be necessary so I don't suck up all my space).
I'm not a guru when it comes to file compression and rendering and video formats and all that happy stuff - I'd like a simple method that works well and produces a decent quality DVD.
I think if I can do it w/just the VHS/DVD machine that'll be the route I take (it'll be least expensive). If I have to buy a camcorder along w/a VHS machine then that's adding $$ to the project and I still need to buy an external HDD - scouring good sales for that info.
Thank you a million times over in advance, I've researched and read and dug and shopped my brains out for the past week and it seems like there is no simple solution.
B's Fan

Just a question.....if you have all these old VHS home movies, don't you already have a VCR? What have you been playing them on all these years?
I agree w/ Sue and Kirk. If you want to edit these old movies, you need to digitize the footage onto DV format.
I just connected my camcorder to my VCR (It is the VCR/TV combo unit and worked fine for this) and recorded the raw VHS footage onto DV tapes. Yes, there were a lot....I think I have about 150 DV tapes (one hour each).
I have been slowly importing them into my iMovies as I create them. I put my still photos and videos in chronologic order, so I import about one or two tapes per movie. Usually the 60min tape gets edited down quite a bit before I am finished. You know, you have plenty of bad shots, blurry images, terrific movies of the floor, ceiling, your hand, etc that can be cropped out.
If you really don't need to edit your movies, and just want them preserved as DVDs, I know that the Sony VHS/DVD combo unit works great. My brother copied some of his old Muhammed Ali fight tapes that he had recorded from tv. He didn't need to edit, just was afraid that the VHS tapes were degrading.
However, I recommended to him that he do the same as I, and get the footage on DV tapes to preserve them. I am sure that DVDs are not going to be the technology of the future. They can become broken, melted, scratched, etc. I save all my edited movies on DVDs and on more DV tapes. I (almost)always export my finished movies back to my camcorder after I have made my DVD.
The DV tapes are small, can be easily stored in a cool dry environment, and your memories are not lost.
Because VHS tapes are not great quality to begin with, you could (and I have done this also) copy the finished DVD to your camcorder by connecting them and recording from the DVD. Supposedly there is a quality loss, but you will not notice because the digital version of your movies will be so much better than the original. I have occasionally had to do it this way when I deleted my iMovie after making my DVD, but forgot to export it back to the camera.

Producer consumer with analog and digital inputs and outputs

Hi everyone,
I am working on a control system program for some practical test work. Currently I am working on the data acuisition component of the Labview program. My architecture is produced-consumer loops with a que. My system will have analog inputs, analog outputs, digital inputs and digital outputs. It's not a time critical sytem, but I would like all of the data acquisition to be synchronised. I have attached my program as it is at the moment. I am having trouble getting all of the data into the que since I have two data types. Also, I'm not sure if i've synchronised the four read/write sequences correctly. I would greatly appreciate if somebody could take a look at my program and give me some advice. Thanks in advance.
Solved!
Go to Solution.
Attachments:
control_v2_DAQ loop.vi ‏46 KB

Robert, the specific error that I get is:
Error -200462 occurred at DAQmx Start Task.vi:6
Possible reason(s):
Generation cannot be started because the output buffer is empty.
Write data before starting a buffered generation. The following actions can empty the buffer: changing the size of the buffer, unreserving a task, setting the Regeneration Mode property, changing the Sample Mode, or configuring retriggering.
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.
I have attached part of my code with just the data acquisition and writing. Any help would be greatly appreciated.
Attachments:
control_v2_ML_simple.vi ‏83 KB

Recommendations on Analog to Digital Converter

First I want to say that many people recommend the "pass-through" feature of many MiniDV cameras. Mine does not have that feature. :-( I am using ADS Tech CapWiz Xpress DX2. It is a fine hardware/software program with the record to hard drive feature. But, it records in MPEG-2, which caused me to have those "red frames" show up in my video. I am using Premiere Pro to edit my video. I do have the option of saving the file as MPEG-1 and MPEG-4 (Divx). But, I'm not sure if I will have the same problem saving in one of those other file types. If that is not a good solution. What other Analog to Digital converters do you recommend for me. I don't want to buy another digital camera. But, a device that I can place between my VCR and laptop that does the job would be great. I prefer a device that can import and save files as the same type that Premiere saves to after "capturing" footage from a digital device. Anything from "Pinnacle" won't work. It won't install on my laptop for some reason.
I am using Windows XP sp2, Duo Core processor, 2GB RAM, Production Premium CS3.

Go to canopus.com as they have what you need ADVC 100, ADVC 50. Try ebay too. Nice converter long lasting, very easy to use. Stays outside the computer so no software to install, and works with every program and platform

No Analog to Digital Conversion Imports, eh?

Been messing around with FCPX using previously imported FCE files. FCPS doesn't care that they are VHS footage imported to FCE using my DV camera as an Analog-to-Digital Converter. It results in DV camera footage iimported as FCE .mov files, with which FCPX is quite happy.
This worked great until I decided to try the same procedure with the "new, improved" FCPX.
FCPX recognized the DV camera, displayed the video coming thru the camera from the VHS player, and had no objection when I pressed the import button. However, tuff cookies on actually importing anything. It created an Event, but placed no files in it.
Now, just as a side note, when I actually put a DV tape in the camera, FCPX controls the camera just fine. Naturally, as a AV/DV converter, there are no controls, and FCPX notes in the upper left corner "Not a Controllable Camera", and when "import" is started it replaces that with a clock counting up the import duration. But no file results.
Apparently, like Apple itself, FCPX doesn't play well (or at all) with anything it can't control.
Anyone actually found a way to get media imported from a tape-based camera which FCPX can't control?
I'm doing just fine importing to disk via FCE and then importing the files to FCPX.
But, really? No way to do it directly?

Well, I suspected as much, but how ya gonna know for sure if you don't ask?
At least I learned I can use QTPro 7 for more than cycling FCE 640x480 anamorphic .mov files into 853x480 .mov widescreen files for iDVD input.
Never even looked at QTPro for capturing. Thanks.
Edit: Took a quick look, and I'm supposing that if I have my "Converter Camera" turned on, it will give me that choice over my iMac camera, but I also noted I apparently can also use QTPro 7 to toss in Chapter Markers on the way to iDVD.
May not work for "power users" and their HD formats, but for working with DVDs as the target output its worth checking out.
As Macked said in his related thread (that I missed when I searched), its just plain stupid to have to use two (actually 3) programs for these simple tasks.
Thanks again.
Message was edited by: Clyde Crocker

How does ipad digital AV adaptor works? does it have a Analog to Digital conversion?

I wonder how the Digital AV adaptor works? I heard the ipad 30-pin connector does not have digital video out. Does it have an Analog to Digital converter inside the adaptor?

Yes..same thing here..I get a pop up saying This Accessory is not Suported...I click Ok and I get a 4x3 "mirror" mode on my TV. However when I play a movie it is in the proper aspect. Same goes for the SlingBox" app. I tested photos and they appear in the 4x3 ratio as well.
I only use the adapter for the occasional movie while staying in hotels so it's not a big deal to me that most of the items are in a 4x3 ratio.
I'm coming from an iPad 1 so mirroring wasn't an option so technically, I didn't even know what I was missing..not sure if the iPad 2 mirror function displays in 16x9 ( or whatever the native aspect is )

How to store the output of a analog to digital converter into an 2D array

Hi
I am doing my M.Tech Thesis in Image reconstruction and I am using labview for simulation and I want to know how to store the output of a analog to digital converter into an 2D labview array.

nitinkajay wrote:
I want to know how to store the output of a analog to digital converter into an 2D labview array.
How exactly are you performing 'Analog to Digital'???
Grabbing image using camera OR performing data acquisition using DAQ card OR some other way????
I am not allergic to Kudos, in fact I love Kudos.
Make your LabVIEW experience more CONVENIENT.

Analog to Digital Converter-- What's A Good Product For My System?

What would be a good analog to digital converter for Final Cut Express HD 3.5 on a Mac OSX 10.4 system? I've used a Canopus on a MacPro with Final Cut Pro before and liked it, but wasn't sure what would be a good product for my macbook. I've looked at the Canopus advc-110 and 55 but am not clear on the difference and if it would work with what I have.

The ADVC-55 is capture only. It includes composite & s-video inputs and stereo audio inputs. Firewire output.
The ADVC-110 is bidirectional (meaning you can both capture and output through it - this is a very good way to monitor your video during production as you can see the actual quality on a monitor/TV rather than just your computer screen, which has limited capability to show you the actual video quality.) It includes composite & s-video inputs and outputs; stereo audio inputs & outputs; Firewire input & output.
The ADVC-300 is also bidirectional and includes composite, s-video and component video i/o (D1 connector) inputs & outputs; stereo audio inputs & outputs; Firewire input & output; and software that enables you to tweak its video settings. Helpful in cleaning up particularly bad analog videos.
I've used these things for years and they all work great. I do not believe there is any difference in the internal conversion hardware ... The primary differences are support for one-way vs. bidirectional conversion; input/output connectors; and the software that comes with the ADVC-300.
If you have basically clean analog video, any of these units will be fine. You can use any analog source (VHS deck, camcorder, DVD player, etc.) and would typically use iMovie or Final Cut Express to capture your video on a Mac.

Premiere Pro 1.5: Best analog to digital converter for BNC?

Recently I've been looking for an external analog to digital converter (that connects via firewire)that will work with Premiere Pro 1.5 for capturing uncompressed digital video from any source, whether it be BNC composite from a U-Matic to S-VHS via S-Video (either DIN or Y/C BNC) to Betacam SP BNC Component. It would also be nice if it could import digital sources (i.e. DVCPRO 50/Digital Betacam) as well by SDI.
I've looked at a few by AJA or Blackmagic, but I'm not sure if they would work with Premiere Pro 1.5 on Windows XP SP3.
Does anyone know of a good converter?

I have NO IDEA if it will work with everything you list, but do some reading at http://www.grassvalley.com/products/converters

Which is the best Analog to Digital Converter

Hey everyone,
Im new to this movie making digital world. I have been using imovie for a while and looking to upgrade to FCP. Before I spend the money, just a few questions hoping someone would know the answers.
1: Can I use idvd to burn my movies with FCP?
2: Im need an analog to digital converter, but not sure which one to get. I have VHS, Hi8, mini DV, etc... Which converter is best with mac, specifically with FCP?
3: Does FCP work well with an external harddrive?
Thanks...

1. Yes
2. Canopus and DataVideo are popular but some camcorders have a built in A-D converter. Note that Mini-DV works without needing a converter. Just plug in your camera with FireWire.
3. Yes

Macbook Pro 4,1 (early 2008) is the DVI port analog or digital?

I have been tasked with a slide show presentation on a family member's HD TV using my MacBook Pro 4,1. The TV is a slightly older big screen TV without HDMI inputs. I would lke to use the component (YPbPr) inputs on the TV rather than VGA. VGA degrades the image appearance too much.
I purchased a "ViewHD" HDMI input (Digital) to YPbPr (analog component) Output Switch Converter with the thought of using my 2nd Gen Apple TV (ATV) to connect the ATV via HDMI into the Converter and output the component YPbPr to the TV set. I am looking for a simple, elegant solution as I know this question will rear it's ugly head again.
First, I could find no resources that discusses the output of the DVI port on the MBP. Is it DVI-D, DVI-A, or DVI-I?
Is there an adaptor out there that I can use to change the DVI out on the MBP (if it is digital) to HDMI so I don't have to use the Apple TV?
Any help or solutions would be greatly appreciated.
TIA

The DVI connector on a MacBook Pro supports both Analog and Digital output.

Enabling Simultanious Analog and Digital Audio Signals

My apple TV runs through a Yamaha receiver. It is hooked up with component video and digital audio cables. I also need to hook analog audio to my receiver so it can play outdoor speakers through zone 2 (which only recognizes analog signals). Zone 2 does not work when I hook both digital and analog cables. Called Yamaha and they said to look for a setting on Apple TV that enables simultanious analog and digital audio signals. Does anyone know if/how this can be done? Or any other way to make the analog zone work without losing digital on the main zone?

AFAIK, the analog audio on the ATV outputs all the time. The audio output setting in the ATV just determines whether the digital output is Dolby or PCM. Try turning off Dolby in the ATV audio settings and see if that makes a difference. If not, the problem is probably elsewhere.

Acquisitions de données analog et digital sur le même front montant TTL

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