EMG signal filtering and feature extraction

[sudheer2011]

Hi I am working on EMG signal acquisition and feature extraction.I am confronted with two problems.

First,

I am using my own hardware to extract EMG signals.After extracting I am not able to filter the

signals.I am using the filter located in functions palette.The path is Express-->signal analysis-->filter.

The problem is I am not able to filter the signals received from my hardware.

I am attaching one paper where u can find some information about this.thank u

The error I am getting when I run the labview program is Error 20020,the cut off frequency fc must meet

0<=fc<=fs/2.Sampling,I have opted automatic sampling in the filter design in labview.This filter is

working with simulated signals but not able to filter my real time data.How can I fix the problem?

Is there anyother filter or method that can serve my purpose?

second,can anybody tell me how to implement willson amplitude method for feature extraction in

labview for emg signals.

[ZJ.Gu]

Hi,

Could you please attach your VI and data samples for us to have a look? That would be more helpful.

BTW, you could refer to this article for reference - http://decibel.ni.com/content/docs/DOC-8206

Thanks!

ZJ Gu

[kunalpal]

Hi ZJ,

I was trying to load the "[NIDays 2009 China Demo] EMG Analysis Using Biomedical Startup Kit" but the VI is not able to load 2-3 palettes. My Institute has just procured the LabVIEW 2010 with full modules.

Can you help in this regard?

Thanks,

KP

[ZJ.Gu]

Hi,

Did you install Biomedical Startup Kit 3.0 source code version?  What the VI you are missing?

Thanks!

ZJ Gu

[Steve.J]

Hi Sudheer,

When you say that you are "using my own hardware to extract EMG signals" does this mean that you are receiving digital data from the hardware (over USB or serial, etc.) or do you have an analog waveform that you are digitizing with an NI DAQ board and LabVIEW?  Please tell us more details about your setup and like ZJ says, also attach your VI so we can get a better view of what is going on.

Thanks,

Steve

[sudheer2011]

Hello steve & zhijunGu.

Coming to the details of my hardware,I am using AT89C51 microcontroller and ADC0808.ADC is used to

digitize the EMG signals received from instrumentation amplifier.This complete hardware is connected to

computer through USB converter.In this MAX 232 is involved for serial connection.I am not using NI DAQ

board.I want to attach my designed VI but I am not getting attachments option.If u give email address,I will send my VI.

I am using labview 8.2.Thank u.

[ZJ.Gu]

Hi,

It would be better to share here to let more people know your problem and discuss how it could be solved.  What's the problem for you to post a VI? You could mail to dsp.nish@ni.codsp.nish@ni.com. Then would you mind I attach it here?

Thanks!

ZJ Gu

[sudheer2011]

Can anybody tell me how to design a classifier in labview to classify different motions after feature extraction is done?Thanx

[karanveer]

hi sudheer

have u got solution to problem.

if yes plz let me know, i have same problem