The anti-aliasing filter selection

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• Filter low pass analog (anti-aliasing filter) external to the NI USB 6251 housing

  Hello everyone!

  -I m trying to acquire an analog signal of tension (high frequency content) using a connected to an edge NI USB-6251 BNC-2110. I learned in this Labview Forum that NI USB-6251 has no analog low-pass filter programmable (or anti-aliasing filter), so that I can't help but jitter when scanning my signals. For my application, the cutoff frequency of the analog low-pass filter must be equal to 100 kHz or MORE (maximum of 500 kHz). A possible solution to solve my problem, would be to work with an external analog low-pass filter before you scan the voltage signal. Based on this I'd like to know:

  (1) national Instruments develops analog external filters? I need a filter which also has one output, analog, so that I could send also the low-pass analog filter filtered signal to my NI USB-6251 box to scan correctly it!

  (2) what model of external low pass filter would be compatible with the NI USB-6251 housing?

  Any help would be much appreciated!

  Best regards!

  Hello

  all high resolution of the M series (628 x) cards are equipped with a filter low pass which can be enabled or disabled programmatically. For the anti-aliasing filter feature, examine the boards of National Instruments DSA (dynamic signals Acquisition) acoustic and vibration measurement
  currently the NOR 9221, 9225, 9227, 9229, 9233, 9234, 9235, 9236, 9239 and 9237 C Series modules feature anti-aliasing filters. These modules are intended for the high accuracy measures for which anti-aliasing filters are a necessity.

  Houssam Kassri

  OR Germany

• How to set the Anti Aliasing in Blackberry Storm?

  I m drawing in a bitmap as...

  bitmap[i] = new Bitmap(60, 60);
  Graphics g = new Graphics(bitmap[i]);
  g.setColor(Color.BLACK);
  g.drawLine(....);
  

  Now how to put Anti-Aliasing on before g.drawLine ()?

  Try again with the addition of this before drawline:

  g.setDrawingStyle(Graphics.DRAWSTYLE_AALINES, true);
  

  Concerning

  Bika

• text for the AF:table filter selection

  Another niggle, this time with af:table filters user interface. I don't know if they are designed to behave this way, but it's a problem for us. Happens in IE, Firefox, Chrome, and probably others.
  
  In the table on the following page:
  http://jdevadf.Oracle.com/ADF-richclient-demo/faces/components/table/filterableTable.JSPX
  
  Click in one of the column filters, type something like SIMPSAN. Now, I want to fix my fault for obvious typo to SIMPSON. If I click on the text I typed, everything is selected. I can delete and retype my filter text. However, I just want to change a character, I find it quite impossible to not have this behavior 'select all' - i.e. I can't click on 'in' the word, or use cursor left keys to the right to navigate to the fault of strike.
  
  It is not the end of the world to type a name again, but if you made a mistake on a 12 characters ID...  :-)
  
  Is this a feature? If so, how can I disable it?
  
  Kind regards
  Barry.

  Hello

  Since it is not impossible to keep the string is entered, I filed this as a request for improvement, not a bug. The ideal behavior would be that a click sets the cursor where you clicked on to. If the user wants to replace the entire entry it can press ctrl + click after.

  Frank

• Example of signals with a filter anti-aliasing

  I use PCI-6259 6221 PCI and USB 6221 cards in different configurations. As I understand it, is that the anti-aliasing filter on all of these cards is fixed to pass to the frequencies of 1 MHz. If I'm a signal from a RG58U BNC cable that is supposed to contain higher frequency of 1 kHz sampling, but there is noise of high frequency present there. A sampling of the signal to 2 kHz would be enough to acquire the signal correctly, or these high frequencies would affect the components of low frequency on sampling?

  I read about too much sampling that allows you to use digital filters (I'm guessing that software filter can be used) If you sample the data at a higher rate. You should always use the anti-aliasing filter, but the required parameters are more relaxed. Would this work in my case? The anti-aliasing filter on my cards has a very high bandwidth, so I don't know how much I need to do to acquire the signal correctly oversampling. Is there an equation?

  Also, if the analog inputs for data acquisition cards are generated by a filter (for example when recording ECG or EEG) which allows you to specify a bandwidth frequency, I still need a filter anti-aliasing? Would be the distance between the amplifier and the DAQ card much a difference when it comes to the generation of noise on the cable?

  In general, I try just to see if my current collection method at the rate of Nyquish with the maps I have is good or not. I just save the data without even using any digital filtering (software).

  That's right - if you go down to 10kS/s then the temporal resolution and minimum pulse detection would 100us.  If it is a just sampling rate or not depends on your requirements for the accuracy of timing and jitter.  In other words, if it's OK that your pulse Detection could could delay until 100us then a 10kS/s sampling frequency should be OK.

• cRIO thanks the Module NI 9237 bridge in the Interface of scanning and Anti-Aliasing

  Hello

  I have questions about the use of a Module NI 9237 bridge with CRIO and its use in Scan Interface mode. The manual speaks the data rate of the module, and a (n) parameter that can be set to adjust (to a minimum of 1613 Hz) which in turn puts across the module built in anti-aliasing filters. It seems (but not explicitly stated) that this data rate setting is available FPGA programming mode.

  Our application is currently running in mode Scan Interface, so my question is what is 'throughput' module (and therefore anti-aliasing filters) mode Scan Interface? And, if we have the analysis period the value 10msec (100 Hz), y at - it no filtering of the anti-aliasiing of software provided automatically by scanning interface itself related to the period of scanning? Or all the anti-aliasing extra something that we must build within ourselves? I looked at the example provided with Scan Interface and there is nothing more.

  I don't understand about anti-aliasing, just need to clarify what is happening for this specific module mode Scan Interface.

  Thank you

  Andy

  Hi Andy,.

  I had to have a quick sleep on this night to get my facts right, hope that the delay was too long!

  The minimum data listed in the 1613 samples/s are due to a forumla that uses the internal time base that is fairly well explained on page 20 of the Manual. The sweep period did not affect the rate of data, or to activate the anti-aliasing filter. My previous post was wrong in that sense, apologies!

  This page helps explain mode of scanning pretty well too, but the best way to explain it is that even if the frequency of the module can be attached to 1613 samples/s or higher, the compactRIO will collect only 1,000 of these samples a second, or in your case if you are using a rate of 10ms loop, 100 of these samples of 1613. The anti-aliasing cut will be based on 1613 x 0.45 as you said and so will be 725Hz (not based on the rate of loop as I mentioned incorrectly)

  In this case with these modules it is probably a good idea not to use a period of scanning slower than 1 msec for the reason you said - if you're worried about oversampling you can always you decimate readings in the software afterwards to take each readings from 1 to 10 (this page explains how do with an eerily similar situation!)

• anti-aliasing using the 9233

  
  

  Hi Jeff,

  The first thing that you should start with is a guide to the delta sigma converter:

  It is the ADC that is used on the 9233. The delta sigma converter has a built-in inherent anti-aliasing filter. If you look at the dynamic features section of 9233 operating manual it will show you some of the features of this filter. The filter is a digital and the bandwidth and the stopband are calculated according to the sampling rate, you specify the 9233. If you give a sampling frequency of 50 kHz,-3 dB attenuation point bandwidth will be 50 k * 0.45 = 22.5 kHz. If all the components below 22.5 kHz will be kept completely and everything above that will be alleviated. This ensures that you will get no aliasing.

  If you apply a 20 kHz filter after that you'll still good data because the threshold for the anti-aliasing filter is greater than the maximum sampling frequency (50 kHz).

  Please let me know if this clarifies this question a little better.

• Illustrator for the Export PNG - without Anti-Aliasing/Bi-cubic interpolation

  There is something missing when you export PNG images in illustrator (file > export) so when the images that have been resized in illustrator get exported, get no not a subsampling anti alising/correct treatment.

  It is a scaling in illlustrator to 88% of the images. The first Image is a PNG export , while the second image is saved through Save for Web... the difference between the qualities of anti-aliasing is obvious:

  

  

  It is important to note that export a JPEG file and choosing 'Art optimized' in the anti aliasing tab gives deirable results but such an option does not exist when exporting png.

  

  ERMM...

  

  You sure?

• Text Anti-Aliasing at the Application level

  Does anyone know how to control the anti-aliasing of text to the application level? I don't want to go through each component and override the method object to set indicators to report on each of them. Anyone know of a more elegant way to do this in the code?
  
  Thank you.

  831503 wrote:
  Thank you, Andrew Thompson

  You and Kleopatra (Pharaoh of the Swing) are welcome. Happy, that I could help him. :-)

• Why anti-aliasing Illustrator CC exported files in Photoshop, even when turned off anti-aliasing?

  Hi all

  I just changed to CC of CS5. My Illustration workflow involves export from Illustrator to Photoshop. I disable anti-aliasing in the export options in Photoshop to make net angles. For example,.25 black line exports ch as a wide black line of a pixel.

  When exporting CC of Illustrator, I select 'none' to the anti-aliasing when exporting, but art is anti-aliasing in Photoshop. For example, exports of line noire.25 to PS as a line blurred grayscale.

  Have I missed something or that I can't export a line of true crenellated Illustrator to Photoshop more?

  Thanks for any help!

  This problem has been FIXED in the version of Illustrator CC 2014.

  Now I can use it!

• How to disable anti-aliasing when layer resizing

  [PhotoShop Elements for Mac Version 6.0]

  Hello

  I want to resize a layer for example the orange ball:

  

  But if I resize the layer of the ball and confirm the resizing automatically apply a smoothing that is not desired in my case:

  

  How can I stop this?

  Thank you very much!

  Also if you have other layers that you want to resize, you can go ahead and free transform allows you to resize your object.

  Then go to filter > Pixelize > facet to remove the anti-aliasing. You may need to run the filter facet several times to completely eliminate anti-aliasing.

• Anti-aliasing

  Hi all as you can see, I have a few anti aliasing problems.  I use cs4 and the pen tool to draw this image, once I closed the way I do selection and anti-aliasing is checked and feather is 0.  I added a black line on the path to show the anti aliasing.  Anyone know how to get rid of the embattled edges?  Thank you

  

  This does not really address the issue, but have you tried to use the path as a vector mask to a layer instead of create a selection?

• change anti-aliasing effect through several layers of text?

  Hi, this might be a weird, but I was wondering if it is possible to change the anti-aliasing of 'pointed' to 'strong' through multiple layers of text. I have exported an illustrator strongly stratified as a .psd file preserving the editability of the text, but am really unhappy that the default value is 'pointed' to both the letters and the kerning. Maybe there is something I should be doing in illustrator before exporting? Select and change the effect of anti-aliasing of the type on each of these layers (there are many) is going to be tedious.

  Thanks in advance for any advice.

  Erika

  With the type tool active, select the layers that must change in the layers panel (SHIFT - and control - click on them to highlight at the same time). Then simply change the smoothing parameters in the options bar, and all the layers should change. It works (at least) CS2, 3 and 4.

  You can even use Select menu > all layers if you are really changing all of them.

• Anti-aliasing in Dreamweaver

  In Photoshop, there is an option of anti-aliasing for text. Is there any option in Dreamweaver? I read in some of the other threads that it is either an OS or a browser option, but what happens if I don't want that they have the option to turn it off? If I do it in Photoshop for a piece of paper, I certainly wouldn't wish to change so that they can review them differently I imagined, so is it possible to lock this option by selecting in Dreamweaver?

  > In Photoshop, there is an option of anti-aliasing for text.

  That will create an IMAGE with anti-aliased text.

  In dreamweaver, html text is a TEXT, and will make the visitor browser/OS
  the text according to the css styles you provide in more specific
  browser/operating system settings that user for text rendering/smoothing.

  It is not in your control if a user wants to turn off the anti-aliasing text on
  their system
  --
  Alan
  Adobe Community Expert, dreamweaver

  http://www.Adobe.com/communities/experts/

• Why Firefox is made of fonts while stairs and blocks, w/no anti-aliasing?

  FF 29.01 under Windows 7. You can see the image below the link to compare how browsers should make the fonts and how my browser actually renders the police. It is not a question of magnification. I have already installed the Anti-Aliasing Tuner extension. I added the layout.paint_rects_separately boolean as well.

  http://i.imgur.com/6kdcFok.PNG

  Seems to me that ClearType is disabled.
  http://www.thewindowsclub.com/disable-font-smoothing-Windows

  This only applies to Firefox? If yes you switch to another font in Firefox settings?