Do I need other Anti-Aliasing before resampling

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• How to disable anti-aliasing when resizing?

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  I have a few images that have hard edges that I need to resize. When I do, the contours become anti-aliasing. How can I stop that from happening? I can't find any option for this.

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• 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?

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  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.

• 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

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  Hello

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

  

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• Icon anti-aliasing problem

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• 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!)

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  It would be unwise to try to start without antivirus/antispyware are has just too many real threats and
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  Here's what I use and recommend: (these are all free and very effective versions.)

  Avast and Prevx proved extremely reliable and compatible with all I have
  launched on them. Microsoft Security Essentials and Prevx have also proven to be very
  reliable and compatible. Use MSE or Avast and Prevx, Prevx 3 but not all.

  Avast Home free - stop any shields is not necessary except leave the file system, Web,.
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  Prevx - Home - free

  Windows Firewall

  Windows Defender (is not necessary if you use MSE)

  Protected IE - mode

  IE 8 - SmartScreen filter WE (IE 7 phishing filter)

  I also IE always start with asset if filter InPrivate IE 8.
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  Two versions of Avast are available 6.x and 4.8 x

  Avast - home - free - 6.x stop shields you do not use (except files, Web, network, &)
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  http://www.avast.com/free-antivirus-download

  Avast 4.8 x - home - free - stop shields, you don't need except leaving Standard, Web,.
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  Or use Microsoft Security Essentials - free
  http://www.Microsoft.com/Security_Essentials/

  Prevx works well alongside MSE or Avast

  Prevx - home - free small, fast, exceptional protection CLOUD, working with other security
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  http://www.prevx.com/   <-->
  http://info.prevx.com/downloadcsi.asp  <-->

  Choice of PCmag editor - Prevx-
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  Rob Brown - Microsoft MVP<- profile="" -="" windows="" expert="" -="" consumer="" :="" bicycle="" -="" mark="" twain="" said="" it="">

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