Cannot use DFD IIR Comb Filter Design in my application

Hi everybody,
I am filtering power line noise 60 Hz and its harmonics (120Hz, 180Hz,..) using Comb Filter Design. I do the same as the example in LabVIEW, but it does not work.
Anyone help me how to put that Comb filter into my application?
Thank you.
Attachments:
Comb Filter.vi ‏83 KB

Hello mipro,
When you say you do the same as the example do you mean the one at this link?
https://decibel.ni.com/content/docs/DOC-14292
And when you say it does not work, can you please be more descriptive. Are you not filtering at all? Can you post pictures showing your results in comparison to results you expect from using the example that you were talking about?
Regards,
-Travis E
National Instruments
Applications Engineer

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Hi,
Thanks for the reply.
The vi is designed but we are having an issue of speed of processing.
This filter takes a long time to process.
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Since our signal can range from 0.1Hz to 5Hz our sampling freq needs to be higher, about 8000 samples/s, this is necessary since the shape needs to be maintained for accurate phase measurements (the signal is always sinewave and with noise on it).However you may suggest this sampling rate based on your experience.
Since the phase in the pass band needs to be linear we have to select FIR and since the filter roll off needed is very sharp as provided in the attachment, the resulting design has a large number of taps(coefficients), this makes the processing slow.
--What would be the appropriate sampling frequency for such a filter design.
--Is it that such filters are slow, if so how can they be put in the front end filtering of signals acquired from a daq (PCI-6229)analog channel in a continuous acquisition mode.
we would be thankful for a quick response.
PLS refer to the attachment for filter characteristics.
thanks & regards,
sunil
Apna Technologies and Solutions
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Details of the filter settings.doc ‏47 KB

Hi,
Thanks for the reply.
The vi is designed but we are having an issue of speed of processing.
This filter takes a long time to process.
We are looking for the following:
Since our signal can range from 0.1Hz to 5Hz our sampling freq needs to be higher, about 8000 samples/s, this is necessary since the shape needs to be maintained for accurate phase measurements (the signal is always sinewave and with noise on it).However you may suggest this sampling rate based on your experience.
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--Is it that such filters are slow, if so how can they be put in the front end filtering of signals acquired from a daq (PCI-6229)analog channel in a continuous acquisition mode.
we would be thankful for a quick response.
PLS refer to the attachment for filter characteristics.
thanks & regards,
sunil
Apna Technologies and Solutions
Bangalore,
Karnataka,
India

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2014-10-05 14:20:55, Info CSI 0000001d [SR] Cannot repair member file [l:22{11}]"termsrv.dll" of Microsoft-Windows-TerminalServices-RemoteConnectionManager, Version = 6.3.9600.17095,
pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral in the store, hash mismatch
2014-10-05 14:20:55, Info CSI 0000001e [SR] This component was referenced by [l:154{77}]"Package_3_for_KB2959626~31bf3856ad364e35~amd64~~6.3.2.0.2959626-3_neutral_GDR"
2014-10-05 14:20:55, Info CSI 0000001f Hashes for file member \??\C:\Windows\System32\termsrv.dll do not match actual file [l:22{11}]"termsrv.dll" :
Found: {l:32 b:wutByJu/YxhxLZan2VmIk9CNy/65VNpYphCkpd5tWqQ=} Expected: {l:32 b:cLIGmreRLrSas6vRjUtCy5Ssmcpt4/Y/SIi46qx4qqI=}
2014-10-05 14:20:55, Info CSI 00000020 Hashes for file member \SystemRoot\WinSxS\amd64_microsoft-windows-t..teconnectionmanager_31bf3856ad364e35_6.3.9600.17095_none_7f53b5b72842754a\termsrv.dll
do not match actual file [l:22{11}]"termsrv.dll" :
Found: {l:32 b:wutByJu/YxhxLZan2VmIk9CNy/65VNpYphCkpd5tWqQ=} Expected: {l:32 b:cLIGmreRLrSas6vRjUtCy5Ssmcpt4/Y/SIi46qx4qqI=}
2014-10-05 14:20:55, Info CSI 00000021 [SR] Could not reproject corrupted file [ml:520{260},l:46{23}]"\??\C:\Windows\System32"\[l:22{11}]"termsrv.dll"; source file
in store is also corrupted
2014-10-05 14:20:55, Info CSI 00000022 [SR] Repair complete
Since it's the first time I use this tool I'm not familiar with this log file, but what I managed to figure out from it is that termsrv.dll is corrupted and windows cannot repair it for some reason.
My question is:
How can I repair this file? Is this even the problem preventing me from connecting to this computer via Remote Desktop?
Here's a link to my original question which contatining the images.
http://answers.microsoft.com/en-us/windows/forum/windows8_1-system/cannot-use-remote-desktop-host-on-windows-81-pro/e4776239-4d9e-4934-ae2d-b87cc09f7ade

managed to figure out from it is that termsrv.dll is corrupted and windows cannot repair it for some reason.
So, the next step supposedly is
using DISM.
Coincidentally I reached that page last night from
this one, which I thought gave me a better awareness of how much manual repair might be possible. E.g. maybe the WinSxS isn't quite as fragile as we are being led to believe? (It's making me feel sort of like how I used to feel about the
registry when seeing all the caveats about using RegEdit before I got used to that tool.)
Advanced guidelines for diagnosing and fixing servicing corruption
http://technet.microsoft.com/en-us/library/ee619779(v=WS.10).aspx
Something else that I became aware of yesterday serendipitously is SxStrace.exe. I have never seen it used but it sounds useful. E.g. perhaps easier to interpret for supplemental clues than the ProcMon trace that I usually advocate.
Or perhaps use both and see in ProcMon when the SxStrace is writing. E.g. filter with Operation Is WriteFile.
However, what I would do first is find out what the state of your system is regarding that module. E.g. try this Powershell pipeline to list what you have.
PS C:\windows> dir -R -Fil "termsrv.dll" | sort-object FullName | ft Length, FullName -AutoSize
Note that I am giving you the whole command line, including prompt to show where the command should be started from.
C.f. another thread where doing the same diagnostic procedure seems to be finding more a problem with the Windows Update software than with the user's WinSxS cache.
http://answers.microsoft.com/en-us/windows/forum/windows8_1-windows_store/windows-81-store-error-0x80070002-comprehensive/2b0ed3e1-1835-4517-97dd-0a7abb6ef74c?page=3#LastReply
HTH
Robert Aldwinckle

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