Administrative and Work Practice Controls.Noise-Control Engineering - Concepts and Options.Brief History of Occupational Noise Standards.Ototoxicity and Synergistic Effects with Noise.Effects of Excessive Occupational Noise Exposure.Industrial Robots and Robot System SafetyĮxcavations: Hazard Recognition in Trenching and ShoringĬontrolling Lead Exposures in the Construction Industry: Engineering and Work Practice Controls Oil Well Derrick Stability: Guywire Anchor Systems Legionnaire's Disease, see OSHA's Safety and Health Topics Page for updated information.Ĭontrolling Exposure to Hazardous Drugs, see OSHA's Safety and Health Topics Page for updated information. Polymer Matrix Materials: Advanced Composites There will be some errors in grammar and sentence structure that occur during this translation process.įor complete understanding and comprehension, please view the video which is included in this text.Technical Equipment: On-site Measurements
#OCTAVE BAND SERIES#
This is an unedited transcript from our video series from Acoustic Fields. Remember, octave bands is just a way to group a bunch of frequencies together so we can look at groupings instead of individual frequencies. So you can see that there’s ranges to the octave bands and that’s what we talked about originally. Alto is 150 to 750 and soprano is 250 to 1000.
So we have bass, a real low bass voice that people have, 250 to 300 Hz range. Let’s look at some examples of bass, tenor, alto and soprano because I think this will help us clarify octave bands a little bit and the ranges, with which they operate. It’s all about loudness, amplitude, strength into those groupings and there’s the upper and lower limits that we went through. So octave bands individual, it is a grouping of individual frequencies that have upper and lower limits. So it’s another higher resolution format so to speak to look at the frequencies within the octave band.
#OCTAVE BAND DOWNLOAD#
Those of you that have used our apps that you download for your iPhone to do noise measurement, know that we have an FFT function on those apps and that function allows you to see individual frequencies within the octave band. But it’s just a simpler way to look at frequencies that kind of are related and act at the same situations, act the same way in terms of loudness. So it gives you an idea of how they break down these octave bands. Now, we have to realize that each octave band has an upper and lower limit, okay? So the 250 has a lower limit of 177 and an upper limit of 354 and then the 250 is right in the middle. We know that our next octave band is two times that or 250. So we have 125 if we choose 125 as our octave band. So it’s a way to measure the loudness across the frequency that really contains these elements. So when you look at your RTA and you’re doing a 3rd octave, a 6th octave, a 12th octave, a resolution then you can kind of see how each group reacts in terms of strength and amplitude. So it has a lower and an upper limit to it.Īnd what do octave bands do? They allow for a definition of loudness across the frequency spectrum. So it’s a group of frequencies into bands that have upper and lower limits. A lot of your sound transmission ratings that we get STC ratings on materials and barriers are based on just those particular groupings. A lot of our test results are based upon those particular octave bands. Those are the standard octave bands that we see. So we have our standard groupings here: 63, 125, 250, 500. Octave bands is composed of individual frequencies. See if we can get an understanding of it. Let’s break it down into its separate components.
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