When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs. This work also investigated the response of human hearing to tone-bursts, clicks, pink noise and a variety of other sounds that, because of their brief impulsive nature, do not give the ear and brain sufficient time to respond. The Fletcher—Munson curves are one of many sets of equal-loudness contours for the human ear, determined experimentally by Harvey Fletcher and Wilden A. The report comments on the surprisingly large differences, and the fact that the original Fletcher-Munson contours are in better agreement with recent results than the Robinson-Dadson, which appear to differ by as much as 10—15 dB especially in the low-frequency region, for reasons not explained. Audio Engineer's Reference Book2nd Ed. Namespaces Article Talk. The high-frequency bands are wider in absolute terms than the low frequency bands, and therefore "collect" proportionately more power from a noise source.
An equal-loudness contour is a measure of sound pressure (dB SPL), over the frequency spectrum, for which a listener perceives a constant loudness when. The curves you can see here are very old curves of from Fletcher-Munson.
The refined Robinson-Dadson loudness curves are now new standardised by. This is an equal loudness contour. If you're an audio engineer, you should know this.
Be careful though about assuming hyperacusis in Autism which greatly interests me.
Video: Wikipedia equal loudness contours Music Theory Tutorial 157 - Equal Loudness Contour
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|According to the ISO report, the Robinson—Dadson results were the odd one out, differing more from the current standard than did the Fletcher Munson curves.
The latter has peaks and dips in the HF region.
The results did not differ much when I blocked the ear canal mounting the mic on an earplug, and what differences there were appeared only in the HF region. Real-life sounds arrive as planar wavefronts, if from a reasonably distant source.
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Equal Loudness Curves (ISO)
An equal-loudness contour is a measure of sound pressure, over the frequency spectrum, for which a. In many discussions on the Bose Pro Portable PA Community you will see references to Equal Loudness Curves (Contours).
For the performing.
Views Read Edit New section View history. At low frequencies the ear is purely pressure-sensitive, and the cavity formed between headphones and ear is too small to introduce modifying resonances. I have confirmed this by measurements using Sennheiser HD headphones, which are flat to 25Hz.
The contents of the Fletcher—Munson page were merged into Equal-loudness contour. Yes, I did measurements first with the ear canal open and the small mic at the entrance but not blocking it.
Unsourced material may be challenged and removed. This surprised me a bit at first, but I now conclude that the HF dip is mostly to do with the deliberate correction for side vs frontal presentation in the headphones and the resonant space they form over the ear.