Question about filter VI in LabVIEW.

I am using LabVIEW 7. I am trying to reduce the noise in a voltage signal that I am sending to LabVIEW. When I use the filter VI (Functions> Signal Analysis> Filter), the output signal looks like the frequency response of the filter. I need to simply get the filtered signal in the time domain. How can I get this?
Are there other ways to reduce the noise of a signal in LabVIEW?
Thank you.

There are a couple things that stick out in my mind. First if you are using the the Express Filter VI, you need to make sure that you know at about what frequency the signal you are acquiring is at. That way you can appropriately set up the filter to get rid of any components you don't want. Since you are wanting to do a time domain, a straight DC voltage won't show any results. Most noise on acquired signals is 60Hz noise, so I would suggest using the appropriate filter to get rid of that noise. If this doesn't help get rid of the noise, it might be an issue with how you are acquiring your signal. In that case you need to let us know how you are acquiring the signal, what hardware your using, and the specs of the acquistion. That way we can come up with some suggestions on what we could do from the hardware end.
There are also some generic filter VIs located in All Functions>>Analyze>>Signal Processing>>Filters that you could try using to see if you have any success. Let us know how it goes.
Tyler H.
National Instruments

Similar Messages

Another BW question about filter in the query definition

Hi ,
I have another question about filter in the query definition.
<u>Question:</u>
Which of the following objects can be filtered in the query definition?
A. characteristic
B. Key figure
C. Structure
D. Units
E. Hierarchy
My answer is A,B,D,E.
The answer in the book is A,B,D
Can anybody tell me which one is wrong?
Thanks in advance,
Liu Jia

HI
1.The answer could be A,B,D.you can not apply filters on hierarchies
2.Whenever there is a change in Attribute data(like Location,Num etc...)that has to be reflected in all aggregates of the cube.Thsi can be done by running "ATTRIBUTE CHANGE RUN".
sri

Question about filter-mappings in the web.xml

I'm a bit new this so apologies if this is a stupid question but want to write a filter mapping that captures /image/<identifier here> and /image/<identifier here>/size/<size here>
I would have assumed <url-pattern>/image/*</url-pattern> would do this but it doesn't. When I try a URL with /size/ in it, I get a File not found error.
So I tried adding a second mapping that uses <url-pattern>/image/*/size/*</url-pattern> and that doesn't work either.
What would be the best way to write a filter mapping that captures both /image/<identifier here> and /image/<identifier here>/size/<size here> ?

Thanks for the reply.
I did end up doing something like that in the end. I think I just couldn't get my mind into gear as usual on Monday.
What's happening is taking a nice neat human readable URL and converting it to the horrible URL used by the system. The reason it's a filter is because someone had written a tiny filter would might only execute 20 lines of code and I think someone felt it was easier to just lump about 240 more lines to execute on each request, which, even if it isn't a huge strain on the system it's nasty and most of the code is unnecessary the vast majority of the time. I'm splitting it up the whole lot based on the various tasks.
This particular functionality could be a servlet. I probably would have done it that if given the task from scratch but I think sometimes I put too much faith in the fact those with more experience should know better. I think I'll try it as a servlet and if someone has concerns about it then I'll ask them to explain to me why it can't be one.

Question about Filter

Hi there,
If a Filter is mapped to a servlet, the request from browser will be processed by Filter first. My questions are:
1) Can we set Filter to JSP or other static components?
2) If the request is forward from another web component, will the request be processed by Filter? or Filter just works for request from browser?
Thanks a lot!

As usually the answer comes few hours after the question have been made ...
I found this presentation:
http://developers.sun.com/events/techdays/presentations/seattle/J2EEandAdvancedFeatures.pdf
at page 7 you can read:
One of the ambiguous areas in previous version of Servlet is in
regard to the interaction between the RequestDispatcher and
filters. Should filters invoke for forwarded requests? Included
requests? What about for URIs invoked via the <error-page>
mechanism? Before Servlet 2.4, these questions were left as open
issues. Now Servlet 2.4 makes it a developer's choice. There's a
new <dispatcher> element in the deployment descriptor with
possible values REQUEST, FORWARD, INCLUDE, and
ERROR.
This means you need servlet 2.4 to manage the situation!

Question about usb in labview

I am currently doing a project about designing standalone data acquisition module with USB 2.0 interface.
For the hardware, a USB FIFO chip(FT245BM) is used to communicate with PC via USB with the driver DLL provided by the manufacturer (FTDI).
I want to use labview (version 7.0)to develop a data logging software and I learned that the functions in the DLL could be called by the 'library call function node' in labview.
My question is:
1.Apart from labview, do I need to intall Measurement and Automation Exploere to configure the hardware before I use it in the labview?
2. I noticed that the type of call in labview should be configured as either 'c' or 'stdcall'. My knowledge about C/C++ is poor, could someone explain them in
detail and which one shall I choose?
3.I heard that not all the DLLs could be used in labview (due to the problem of different format???). I don't quite understand about this. Could anyone be kind to explain about this as well?
Many thanks!!!

Xiaohui wrote:
> I am currently doing a project about designing standalone data
> acquisition module with USB 2.0 interface.
>
> For the hardware, a USB FIFO chip(FT245BM) is used to communicate with
> PC via USB with the driver DLL provided by the manufacturer (FTDI).
>
> I want to use labview (version 7.0)to develop a data logging software
> and I learned that the functions in the DLL could be called by the
> 'library call function node' in labview.
I assume your chip comes with a Software Development Kit (SDK) with a
ready made driver. This driver consists of a kernel mode driver and the
user mode shared library (DLL). LabVIEWs call library node can be used
to call such user mode DLLs.
> My question is:
> 1.Apart from labview, do I need to intall Measurement and Automation
> Exploere to configure the hardware before I use it in the labview?
Very unlikely, as the driver which comes with your SDK for the chip will
be not configurable at all in Measurement & Automation Explorer (MAX).
MAX really is only to configure National Instruments hardware devices
and to some lesser extend external measurement devices connected through
the GPIB, VXI and PXI bus.
The NI-VISA driver 3.0 which comes in LabVIEW 7.0 can also directly
communicate with the raw USB interface of some devices. If you want to
use that interface you would NOT install the driver for that device and
would configure that device in MAX instead. You do need to know the
manufacturer ID and Device ID of your USB chip for that. Also the
programming in LabVIEW through the VISA functions is possible but it is
not very simple and completely dependant on the implemenation of the USB
communication by that chip. There are some documents on Developer
Exchange and also some discussion topics here on this forum about VISA
and USB communication.
> 2. I noticed that the type of call in labview should be configured as
> either 'c' or 'stdcall'. My knowledge about C/C++ is poor, could
> someone explain them in detail and which one shall I choose?
Most Windows DLLs use stdcall but this is not a must. If you get it
wrong you will simply crash LabVIEW. The documentation or if that
doesn't work the header file which comes with the DLL should give you
this information, although for the header file you need to know a little
C to understand where it shows this.
> 3.I heard that not all the DLLs could be used in labview (due to the
> problem of different format???). I don't quite understand about this.
> Could anyone be kind to explain about this as well?
Windows DLLs should be fairly standard. The only problem could be .Net
assemblies which are not really DLLs but a complete archive of DLL's
documentations, certificates and, and, and!
It's still very unlikely that a device would come with a .Net assembly
instead of a simple DLL with the according API.
Rolf Kalbermatter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Question about the Filter type for the trace provide "Microsoft-Windows-Kernel-File"

Hello all,
I have moved this question from the Windows
Server General Forum accorfing to the suggestion from Mr. Justin Gu
I have a question about the Filter function for the trace provider "Microsoft-Windows-Kernel-File".
I can find the Filter function with the following operation.
Mr. Justin Gu wrote:
> You create a Data Collector Set for the trace provider "Microsoft-Windows-Kernel-File" and finish completely, then you > can right click it and select Properties.
In the Properties dialog box, click Filter and
then select ‘Edit…’. You will be> able
to see the Filter type and Filter data in the Filter dialog box.
What
Kind of Filter can
I use in this Filter dialog box?
And, how can I set to exclude the some kind of datas?
Could you give me your suggestion?
Thank you.

What
Kind of Filter can
I use in this Filter dialog box?
And, how can I set to exclude the some kind of datas?
Could you give me your suggestion?
Thank you.
I'm looking for the same information.

A question about LabVIEW's instinct.

Hello guys:
I have a question about LabVIEW's nature.
Is LabVIEW a language that can realize the operation system(OS) ?
I feel LabVIEW can express my idea intuitively in my mind.
So LabVIEW can help me develop some program rapidly.
I think LabVIEW can do it.
How about your opinion?

Do you mean can LabView read your mind?
Not by itself, external hardware is required.
Jeff
"´^¤j®ü" wrote in message
news:3b05a593@newsgroups....
> Hello guys:
>
> I have a question about LabVIEW's nature.
> Is LabVIEW a language that can realize the operation system(OS) ?
> I feel LabVIEW can express my idea intuitively in my mind.
> So LabVIEW can help me develop some program rapidly.
>
> I think LabVIEW can do it.
>
> How about your opinion?
>
>
>
>

Basic question about NR filter

Very basic question about the (perhaps oversimplified) interface of the noise reduction filter.
Does anyone know definitively whether the first "Strength" slider is a master control for the filter overall (i.e. it controls the power of all other sliders below it), or whether it only affects an individual parameter (such as what might be perceived as luminosity-based noise, rather than color noise)?
In other words, if Strength is set to zero, but Reduce Color Noise is set to 100%, does the color noise reduction effectively become zero or 100%?
Neither the Help Menu nor three of the aftermarket books I have definitively addresses this. There are further redundancies regarding this "Strength" slider when advanced mode is turned on: for instance, if Strength on the "front" panel is set to 0, but 9 on the individual channel panels, what is the effective strength?
Thanks in advance -

Yes I'm sure it will work great for you.
The iFrame format is something Apple has come up with. The reason for its existence is unknown to me so I can only speculate. But it seems to me that Apple "invented" this format in order to have devices such as Ipod/Ipad/Iphone/Ixxx create clips that are editable on consumer hardware such as already mentioned devices but also standard Mac computers, without the need for format conversion.
iMovie converts most input formats during import, which takes a lot of time, and this need for conversion often comes as a surprise to most people new to home video editing.
iFrame has a resolution of 960x540 which is long way from the common standards of 1920x1080 and 1280x720. If your end target is YouTube however, this may not be too bad though. However if you intend to go with YouTube HD, you may find iFrame footage to look wrong since they are effectively upscaled to a higher resolution.
Technically iFrame uses the H.264 algorithm, a smaller frame size (960x540) and a rather low compression scheme. This will result in large files, but the plus side is that the files are ready for editing without the need for any conversion and iMovie will natively edit the files.

A question about the example "Filter"

Hi,
I have a question about the example "Filter (The Filter example illustrates how to filter data using a butterworth filter)" in the measurement studio reference now, it is one of the analysis examples.
I load this example in Vc++, but when I compile it, the error messages are:
"'ButterworthHighPass' : is not a member of 'CNiMath'" ,
"'ButterworthHighPass' : undeclared identifier",
"'ButterworthLowPass' : is not a member of 'CNiMath'" ,
"'ButterworthLowPass' : undeclared identifier",
"'WhiteNoiseWave' : is not a member of 'CNiMath'" ,
"'WhiteNoiseWave' : undeclared identifier",
Can you tell me what is matter? and how can I solve it?
Thanks!

Hi,
I was hoping that you could tell me what version and edition you have of Measurement Studio. I also need to know if you are using .NET or 6.0. For example, "I am using Mesurement Studio Enterprise edition 7.1 for Visual Studio .NET."
Depending on the version that you have, different functions and controls are included. I believe that you may have an edition that does not include the Butterworth filter. Let me know and we can go from there.
Thanks,
Caroline
National Instruments
Thanks,
Caroline Tipton
Data Management Product Manager
National Instruments

A question about UDA and Data-Forms

Hi all,
I have a couple of questions about UDA. I am using Hyperion Planning 11.1.1.3m, and when I desing a Data-Form I would need to use the UDA I asigned for the Entity dimension: is that posiible?
The other question is, when creating a Substiution Variable in Essbase I use the function @UDA (+dimension+, "MemberA"), but when using this variable in the Data-Form, it does nothing at all(in fact, it is been detected as an error). Why is that happening?
Thanks a lot

Use an attribute dimension to achieve what you are trying to do with UDA's in a data form. An attribute dimension will allow you to filter on members in the base dimension by a specific attribute the same way a UDA will. You can create the attribute dimension in the dimension editor in Planning by selecting the base dimension (Entity) and then select the custom attributes' button. Check the dba guide for a step-by-step approach.
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Question about the programming of a legend

Hello everybody,
I have a question about the programming of a waveform's legend. I
already asked here in this forum about the legend programming (03)
months ago.
I went satisfied but I ve just noticed that this code
(See Code old_legend_test.llb with main.vi as main function) operates a
little different from my expectances.
Therefore I have a new question and I want to know if it
is possible by labview programming to plot and show, on a waveform
chart, a signal with activ plot superior to zero (0) without to be
obliged to plot and show a signal with activ plot equal to zero (0) or
inferior to the desired activ plot.
I give you an example
of what I m meaning. I have by example 4 signals (Signal 0, 1, 2 and 3)
and each signal corresponds respectively to a channel (Chan1, Chan2,
Chan3, Chan4). I want to control the legend (activ plot, plot name and
plot color) programmatically. Is it possible with labview to plot signal
1 or 2 or 3 or (1, 3) or (2,3) or (1,2,3) or other possible combination
without to active the signal with the corresponding activ plot zero
(0)?
Let see the labview attached data
(new_legend_test.llb with main.vi as main function). When I try to
control the input selected values again I get them back but I don't
understand why they have no effect on the legend of my waveform chart.
Could somebody explain me what I m doing wrong or show me how to get a
correct legend with desired plots? Thank by advance for your assistance.
N.B.
The
both attached data are saved with labview 2009.
Sincerly,PrinceJack
Attachments:
old_legend_test.llb ‏65 KB
new_legend_test.llb ‏65 KB

Hi
princejack,
Thanks for
posting on National Instruments forum.
The behavior
you have is completely normal. You can control the number of row displayed in
the legend and this rows are linked to the data you send to your graph. Thus,
if you have 3 arrays of data, let say chan1, chan2 and chan3, you can choose
which data you want to display in your graph using the property node (Active
plot and visible). But for the legend as you send 3 plots there is an array of
the plot name [chan1, chan2, chan3] and you can display 0, 1, 2 or 3 rows of
this array but you cannot control the order in this array! So, to be able to
change this array you have to only send data you need to you graph. I'm not
sure my explanations are clear so I have implemented a simple example doing
that.
Benjamin R.
R&D Software Development Manager
http://www.fluigent.com/
Attachments:
GraphLegend.vi ‏85 KB

Question about PNP...LDB

Hi All,
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From my standpoint I know when ever we give selection to PNP screen we have to check this selection parameters in our programs, like date range ,person number, employee status etc .RIGHT?
Somebody ask me that without checking selection in our report I mean any parameters, it can filter the record, my Answer was BIG NO. You need to check all the parameters in your program.
Next question asked by me was what the purpose of PNP. I replied that rather then declaring and doing bunch of databases SAP provide logical database so current all the records and do what ever you like to do.
What you think guys?
Thanks

Here`s the question , when I am giving "1"active employee in employee status why its pulling up the information for '0' withdrawn employee?
Message was edited by: Saquib Khan

Question about metadata filtering and document sets

Hello,
I have a question about the metadata filtering when using document sets.
When i use the metadata filter for example for "Installatie: P00001" it shows.
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Hi striker,
You can add the "Content Type" in Hierarchy Fields for your list, then click the "Document Set" to filter the document set type item, then you can input the "P00001" in Installatle key filter, click apply, then it should show only document set
items with field value P00001.
http://office.microsoft.com/en-001/sharepoint-help/set-up-metadata-navigation-for-a-list-or-library-HA102832523.aspx
Thanks
Daniel Yang
TechNet Community Support

Questions About JSP?

hi;
I am php devloper and I am learning Java now.
I am using NB6.1 , Tomcat 6.0 , J2ee 5.
I have some questions about devleoping web application with jsp.
1.What are
/WEB-INF/web.xml
/META-INF/context.xml
/META-INF/MANIFEST.MF
files that generated with NB.are important or optional.are auto generated or may I edit.
2.can I distribute my web application in non text format.How?
3.if I want to add some files to my application that its running in tomcat.how can i do that with out rebuild all.
thank you
Add to mtz1406's Reputation

thank you all for helping.
I will write more information about my questions may this help others:
*{ /WEB-INF/web.xml* - The +Web Application Deployment
Descriptor+ for your application. This is an XML file describing
the servlets and other components that make up your application,
along with any initialization parameters and container-managed
security constraints that you want the server to enforce for you.
This file is discussed in more detail in the following subsection.
As mentioned above, the <code>/WEB-INF/web.xml</code> file contains the
Web Application Deployment Descriptor for your application. As the filename
extension implies, this file is an XML document, and defines everything about
your application that a server needs to know (except the context path,
which is assigned by the system administrator when the application is
deployed).
The complete syntax and semantics for the deployment descriptor is defined
in Chapter 13 of the Servlet API Specification, version 2.3. Over time, it
is expected that development tools will be provided that create and edit the
deployment descriptor for you. In the meantime, to provide a starting point,
a [basic web.xml file|http://localhost:8080/docs/appdev/web.xml.txt]
is provided. This file includes comments that describe the purpose of each
included element.
NOTE - The Servlet Specification includes a Document
Type Descriptor (DTD) for the web application deployment descriptor, and
Tomcat 6 enforces the rules defined here when processing your application's
<code>/WEB-INF/web.xml</code> file. In particular, you must
enter your descriptor elements (such as <code><filter></code>,
<code><servlet></code>, and <code><servlet-mapping></code> in
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h4. } from tomcat documentation
Tomcat Context Descriptor
bq. A /META-INF/context.xml file can be used to define Tomcat specific \\ configuration options, such as loggers, data sources, session manager \\ configuration and more. This XML file must contain one Context element, which \\ will be considered as if it was the child of the Host element corresponding \\ to the Host to which the The Tomcat configuration documentation contains \\ information on the Context element.
}from tomcat documentation
but I still want more information about this question:
Q3: I want to distribute (sell to another organaization) without give sorce code in jsp files.So I want to precompile it to be just class files or jar files.
I want to use ant that become with netbeans 6.1.can anyone give me information about how to do that.
thank you again

Question about autodiscover in case of multiple bound namespace

Hi Experts,
I have a question about the autodiscover behaviour. Let's assume we have the below infrastructure:
SiteA :
MBX-Server-SiteA : Member of a DAG
CAS-Server-SiteA : outlook anywhere url = siteA.domain.com
SiteB :
MBX-Server-SiteB : Member of a DAG
CAS-Server-SiteB-1 : outlook anywhere url = siteB-1.domain.com
CAS-Server-SiteB-2: outlook anywhere url = siteB-2.domain.com
We have DB-1 and DB-2 that have copies in both MBX servers.
My question is how does exchange select the access URLs to return in the autodiscover process? I know that it depends on where the mailbox is hosted but can't find details about the process in the technet articles.
Thanks.

There's quite a few details that are involved in the Autodiscover process. First of all - probably the most important thing is that there are 2 stages to the whole process.
In the first stage, the client is simply concerned with getting the address of a CAS server that will help it further. We'll keep things simple and assume your scenario where the client is located inside the network and is domain-joined. The details of the
LDAP query are detailed in
this link. (At the time I was investigating this I've actually went ahead and ran the queries using the ldp.exe client against the Configuration partition of the respective AD domain - it's worth seeing the actual responses.) An interesting trick here is
the 'keywords' attribute that's stamped on those SCP entries. The reason behind it is that you don't want a client located in a site to go half across the globe in order to connect to a CAS server, when there's one available in its own site. One simple way
to get the 'keywords' attribute stamped is through the Set-ClientAccessServer cmdlet, using the -AutodiscoverSiteScope parameter. In your example, you'd probably want to run it against the CAS server in Site A and specify the name of the corresponding AD site
('SiteA') and correspondingly against the 2 CAS servers in Site B (using 'SiteB'). Once the client has got the response to his query, it will attempt to select one server that's handling the site he's in (essentially it will filter the results based on 'keywords'
-contains <client-site>). Now that we got our endpoint we can go to stage 2.
In stage 2, the client will actually use EWS in order to query the Autodiscover service itself running on our target server. There are 2 possible interfaces of accessing the Autodiscover service: POX (Plain Old XML) and SOAP. POX will be targeting the ../Autodiscover.xml
URLS, while the SOAP one will be using ../Autodiscover.svc URLs. Details about this including some hardcoded parts are
here. What happens next is detailed in point 3, section 2.1 The Autodiscover Process
here. This last link is the key to the whole process:
"It provides a list of CAS that has AutodiscoverSiteScope information set for the
Associated AD site of the Database where the client Mailbox is located."
In other words, the CAS is smart enough to return the URLs belonging to a CAS server in the AD site where the client's mailbox' database is active.
My advice is to test this on your scenario. Tests can be done here first-hand: the Outlook's tray icon Test E-Mail AutoConfiguration can be used or alternatively - if you want to see the details in the communication - SoapUI
for the SOAP access method, for POX there's an extension called 'Postman for Chrome' that can be used. I've used all these in my tests back when I was fighting conflicting results from the articles around the web about Autodiscover.
That's a long way of saying we get the AutoD URL of a CAS server closest to the workstation, which then provides the configuration to use which are the the URLs closest to the mailbox :)
By all means look at the SOAP response, but Outlook will only use POX. Lync does SOAP along with other 3rd party apps.
Cheers,
Rhoderick
Microsoft Senior Exchange PFE
Blog:
http://blogs.technet.com/rmilne
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Note: Posts are provided “AS IS” without warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose.

Question about filter VI in LabVIEW.

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