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Test and Measurement World FIR Program

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banjo

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I found some FIR software at:

**broken link removed**

This appears to be free software. However, it is expecting an input file in an Agilent ASCII Tab delimited format. I have data what I captured with an ADC. I know the sampling interval. But I do not have the correct format for this Agilent file.

Does anyone have an example of such an ASCII file?

Does anyone have any documentation of this file type?

Has anyone used this software before? Is it all useful for testing various scenarios?


Thanks.
 

Thanks for spotting this program, it looks interesting.
Pretty incredible that they use VB for this, when a simple text program in C or C++ would have been more useful for non-Windows users too.
It could have outputted in a bmp or png format as well as the processed text file.
Anyway, it looks like this function below (I'm not super familiar with VB), and looks like the delimiter is not tab, but CRLF
(carriage return, linefeed). I tested by just creating a simple text file containing a floating point number on each row.
This was my example input:
Code: 
1.6
1.9
1.5
1.4
1.2
1.0
1.5
1.3
1.6
1.8
1.6
1.2
1.6
1.0

This was the program screenshot before and after (lowpass):
fir.jpg

This is the snippet in their source code:

Code: 
Public Sub LoadFileTXT(fp As String, data As Variant, description As String, _
                        cancel As Boolean)

 ......
    
    strTemp = Input(LOF(hFile), hFile)
    
    strArray = Split(strTemp, vbCrLf)

    Close #hFile
    
    ' make the double data array.
    ' if the first element is not numeric, start at the second element
    If IsNumeric(strArray(0)) Then
        ReDim data(UBound(strArray) - 1)
        For i = 0 To UBound(strArray) - 1
            data(i) = CDbl(strArray(i))
        Next i
        
    Else
        ReDim data(UBound(strArray) - 2)
        For i = 1 To UBound(strArray) - 1
            data(i - 1) = CDbl(strArray(i))
        Next i
    End If
   .....
 
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    banjo

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Thanks for the tip. I converted my experimental data into a single column format as you suggested and the software loaded it fine. I am not too sure how useful this software is. I believe it expects that the data you load contains one cycle of the input waveform. It allows some choices in filter types, but does not detail the filter equations at all.

What I had hoped this software could do was take my experimental data and allow me to figure out a usable filter to extract the desired signal from the garbage. It does not really do that. However, I need to play with it some more. It may have some usefulness. Since the link also has the Visual Basic source code, perhaps this could be used to expand the functionality.
 

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