Thank you for the feedback. Obviously the more accurate the better, some are +/- 2db and some are better than that. We will get in touch if we have any questions. This was really informative. Anyone know if/how to calibrate these things? Thanks again NIOSH. Having read this I thought it was rather informative. Some of these apps have been developed by highly-skilled engineers and programmers who have a great understanding of the principles of acoustics, sound measurement, and applicable noise standards. A total of 130 iOS apps were examined and downloaded from the iTunes store*, of those, 10 apps met our selection criteria. More information can be found on page 7 at http://www.cdc.gov/niosh/surveyreports/pdfs/349-12a.pdf. Sound cancelling earbuds are able to calculate the actual normal noises amount if they’ve already a associate app. I am very happy to read your post. I am a civil engineering student and have recently begun to find ways to use our phones to improve our ability to not only increase safety, but also efficiency. Discussion Starter • #1 • 3 d ago. I really can’t believe you have published this “research” under the NIOSH name, leaving readers thinking that a current smartphone can possibly make these measurements accurately. 5 (2), 18-22. As for RTA, you’re correct, the processing power in these devices allow for some very complex analysis. For app selection, please see our detailed response to comment 12 below. If you got a microphone capable of responding in that range, you could amplify that signal with a filter to cut out the audio band, then mix it with oscillator output. 86% of iOS devices run the most recent version of iOS compared to only 11% of Android devices running the most recent version of Android OS? Noise cancelling earbuds are able to measure the ambient noise level that if they have a companion app. indeed article which could be a reference for me who need the information smartphones. It is a breakthrough for the study of work environments and propose improvements for jobs. Smartphones were set up on a stand in the middle of the chamber at a height of 4 feet and approximately 6 inches from the reference microphone as shown in Figure 1. Evaluation of smartphone sound measurement applications. As an industrial hyginist and safety engineer I’ve done research on this field in 2013 as part of my bachelor safety engineer. This is an excellent idea, Eva – to allow other crew members to use your SPL meter to calibrate their apps (since calibration is one of the most important things to achieve better accuracy). As mentioned in our article, we continue to see the same issues with the Android-based apps – fragmented marketplace for hardware devices, lack of uniformity in audio integration between the different manufacturers, and most importantly, lack of support from the developers community. However, starting with iOS 6, Apple allowed developers to bypass such filters. At 20kHz the tolerances are +6dB and – infinity (+4dB and -infinity for Class 1). Thank you for your comment, there are few new studies on methods for calibrating smartphones for noise monitoring and measurements (e.g., Dumoulin et al., 2013 http://scitation.aip.org/content/asa/journal/poma/19/1/10.1121/1.4800063; and Robinson and Tingay, 2014 http://www.acoustics.asn.au/conference_proceedings/INTERNOISE2014/papers/p565.pdf). I was able to find good information from your blog articles. Please see the November 2016 and January 2017 updates above, they point to our study on the use of external, calibrated, microphones to achieve closer agreement with a sound level meter. The others used Average or Mean as a descriptor. What an interesting study. It was only 15 feet up and the ceiling was over 30 feet high. NIOSH is a research agency. I’m familiar with your app, and it’s wonderful to see some Android developers such as yourself put greater efforts in including appropriate metrics and advanced features into their applications. We live in a very noisy world. There are a number of design choices that can help or hinder repurposing. – Batteries and flash storage media should be easily replaceable and upgradeable in capacity. thanks, We live in a noisy world. The decibel app pro is only what you said it is. While the paper was very interesting, it does not do enough to caution the potential user that the resulting measurements do not come near to meeting International IEC or even local US ANSI measurement standards, nor to accurately measuring many “real world” noises sources, however close to the “truth” it seems on simple sinusoidal noise sources. I just downloaded Decibel Ultra on my ipod touch 4G and in a quiet room with no noise its reading 51db average. Thanks. Remember, these apps are only meant to give you a rough idea about your environment, they do not replace the need for a professional noise assessment. Click here to login, The ability to reply to and create new discussions, Access to members-only giveaways & competitions, Interact with VIP industry experts in our guest Q&As, Access to members-only sub forum discussions, Get INSTANT ACCESS to the world's best private pro audio, Promote your eBay auctions and Reverb.com listings for free. Android developers must still work around such filters during the development of their apps. $2000), It is definitly opening an new research field and (i believe) an necessity for ohs professionals to learn about the apps risks and possibilties. Amazing article. I recently came across your blog and have been reading along. Android may be pretty good too. Thanks a lot.Keep it up.Keep blogging.!! I tend to use them just to get a preliminary reading if I think there is a problem. 22,000 16-bit samples per second scales up to just under 28GB per week, comfortably within limits of removable flash memory cards that most smartphones can use. Decibel Meter is an application for measuring sound volume in decibels(dB). Of course, they tested over 65-95 dB so higher I'm sure they'll clip but you can use an external mic for that. The risk manager says it is okay with earplugs that were given in a plastic cup with no instructions or rating. Is there an app to detect soft intermittent noises? 2.The App was more accurate at low level or High Level ? With it, I have recorded live pipe organ, capturing a visible 20 to 20 kHz, though I don’t have the means to quantify any fall-off. Most of what’s said here is Greek To Me. Celestina, M., Hrovat, J., & Kardous, C. A. It’s possible, the main issue is in the phones’ built-in microphones and the ability to calibrate to a known sound level. This may be a good time to reiterate what we noted in the blog and in our published paper: “References to products, services, or apps do not constitute an endorsement by NIOSH or the U.S. government.”. For such analysis, the use of a “professional grade” external microphone (that can be calibrated using acoustical calibrators) would be crucial to obtain quality results. I thought I would leave my first comment. In the example below, the sound level meter is showing the current LAF, LAFmax and LAFmin values of 55.9dB(A), 90.6dB(A) and 54.5dB(A) respectively.
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