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Thread: Inception barrel?

  1. #231
    Insider noclue119's Avatar
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    I can tell you that my ears thinks the Stella barrel is a lot quieter.

    I guess we will have to see.

  2. #232
    Insider PBSteve's Avatar
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    Quote Originally Posted by Simon View Post
    Some sounds would register almost exactly the same DB's but would be perceived as "softer" because they were more drawn out. Short and sharper bursts at the same DB level were perceived as louder even though they weren't.
    Interesting. Do you think the meter was doing short-interval averaging (perhaps due to a slow FFT algorithm), or do you suspect it was more a psychological ramp-up, ramp-down type of effect?

    I'm always leery of trusting black-box measurement equipment for transient phenomena, but admittedly don't know how sound dB meters work.
    Last edited by PBSteve; 06-27-2014 at 01:03 PM.
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  3. #233
    I am not too sure about the meter, it was one we got from PMI when we merged to form KEE, and it didn't come with any instructions. I believe it was just giving us the peak DB value.

  4. #234
    Insider Lumberjack's Avatar
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    Quote Originally Posted by Simon View Post
    Lol, awesome. I look forward to the results from that.

    One thing I found fascinating when we first worked on the TM15 and I started doing a lot of research on making paintball markers quieter is how perception was often more important to people than the actual DB value.

    Some sounds would register almost exactly the same DB's but would be perceived as "softer" because they were more drawn out. Short and sharper bursts at the same DB level were perceived as louder even though they weren't.

    If I hadn't studied engineering I would have studied Psychology
    I believe Jack Wood mentioned that about the perceived loudness of a marker has more to do with the length of the burst than the actual volume. Was in a thread on PBN a couple years ago during a discussion about his work refining the Ego's sound signature on the 10 or 11 if I'm remembering correctly.

  5. #235
    Insider new ion?'s Avatar
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    Pretty sure lurker mentioned it in his LV1 tech video too

  6. #236
    Insider PBSteve's Avatar
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    Quote Originally Posted by new ion? View Post
    Pretty sure lurker mentioned it in his LV1 tech video too
    Yeah but he's never measured it himself, just repeating what he's heard.

    I wonder if anyone took into account the frequency response of the human ear in their testing. For eyes there's something called the luminosity function which describes the eye's response vs. wavelength:

    http://en.wikipedia.org/wiki/Luminosity_function

    Apparently there's a similar phenomenon for ears described by the "equal loudness contour" and "absolute threshold of hearing".

    http://en.wikipedia.org/wiki/Equal-loudness_contour

    http://en.wikipedia.org/wiki/Absolut...old_of_hearing
    Last edited by PBSteve; 06-27-2014 at 06:31 PM.
    Ever so many citizens of this republic think they ought to believe that the Universe is a monarchy, and therefore they are always at odds with the republic. -Alan Watts

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  7. #237
    Insider noclue119's Avatar
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    So i got a peak DB meter. I plan on hooking that up in conjunction with a mic to record the sound wave profile for each shot. I'll do a few tests today/tomorrow and do the full video later this week.

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  9. #239
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    http://en.wikipedia.org/wiki/Psychoacoustics

    Specifically, applying A-weighting to your direct measurement will give you a better idea of perceived loudness from the recorded spectrum.

    http://en.wikipedia.org/wiki/A-weighting

    Leading edge effect stuff *IS* more anecdotal but if you look into precedence effect you can see the localization is most strongly affected by the initial event.

    The simplistic explanation for the length of burst stuff is just dP/dt

  10. #240
    Insider noclue119's Avatar
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    I got http://www.frys.com/product/6344191
    Nothing too fancy just wanted to see peak db with a standard mic recording the waves


    Quote Originally Posted by Lurker27 View Post
    http://en.wikipedia.org/wiki/Psychoacoustics

    Specifically, applying A-weighting to your direct measurement will give you a better idea of perceived loudness from the recorded spectrum.

    http://en.wikipedia.org/wiki/A-weighting

    Leading edge effect stuff *IS* more anecdotal but if you look into precedence effect you can see the localization is most strongly affected by the initial event.

    The simplistic explanation for the length of burst stuff is just dP/dt
    *edit* Just looked this model already does the A weight built in.
    Last edited by noclue119; 06-30-2014 at 04:07 PM.

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