when using a high pass filter - need help

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joshcamp
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2011/09/05 17:06:48 (permalink)

when using a high pass filter - need help

I notice that i still see signal in analyst when using a hig pass filter to eliminate frequencies below 120hz, for example.  I'll get <40hz show up.  How can I remove these 'rogue' signals for good ? 
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    The Maillard Reaction
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    Re:when using a high pass filter - need help 2011/09/05 17:42:58 (permalink)

    The first thing to consider is what is the window size of your analyst application?

    If you don't have it set for detailed viewing the bass frequencies will be illustrated with minimum detail.

    Most analyst apps will have FFT window size choices.

    Try 8196 or something like that.



    best regards,
    mike


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    joshcamp
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    Re:when using a high pass filter - need help 2011/09/05 18:00:15 (permalink)
    thanks - tho, dont know how to do that within sonar X1's analyst plug...
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    Bristol_Jonesey
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    Re:when using a high pass filter - need help 2011/09/06 06:05:17 (permalink)
    joshcamp


    I notice that i still see signal in analyst when using a hig pass filter to eliminate frequencies below 120hz, for example.  I'll get <40hz show up.  How can I remove these 'rogue' signals for good ? 


    Use a steeper filter, though if you go too steep, you'll introduce distortion.

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    The Maillard Reaction
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    Re:when using a high pass filter - need help 2011/09/06 07:56:46 (permalink)
    If the analyst selection doesn't have a detail selection you should try a better analyst.

    The reason I would not start with a steeper slope is that there may not actually be anything going on to worry about.

    If you can't hear it and you are only seeing it on a low res analyzer then you might be reacting to a visual anomaly rather than anything to be concerned about.


    Most analyzers do a good job at normal settings at mid range and hi frequencies. You need a lot more data to make a good analysis of the low frequencies.


    best regards,
    mike



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