Talk:Equal-loudness contour

message: I am not happy with the statement, "headphones change the acoustics of the ear, however, (particularly attenuating low frequencies". My understanding is that the ear is purely pressure sensitive at low frequencies, and since the cavity formed between headphones and ear is too small to resonate in this region, headphones in no way change the acoustics. Provided that the headphones are flat, and a good seal exists to the ear, errors in this region are very small.  I have confirmed this by measurements using Sennheiser HD650 headphones, which are flat to 25Hz. Many headphones are not flat, or do not seal, but this is not changing the acoustics of the ear, and usually results in loss of low frequencies. The Fletcher Munsen curves are actually in quite good agreement with the revised ISO 226 at low frequencies, and at 40 phon level (A-weighting level)and it is the Robinson Dadson curve that seems to show increased LF sensitivity, suggesting perhaps that something was badly wrong with the speaker/room response in these experiments.
*I'm not sure I understand how the HD650 is 'flat' to 25Hz when measurement from HeadRoom shows a clear bump of ~5dB from 25Hz up to around 400Hz. Can somebody clearify that for me? Appreciate it! =) -- Dept of Alchemy 04:10, 11 May 2006 (UTC)
thread_title:  Headphone measurements 

message: You can find my own measurments at http://www.lindos.co.uk/cgi-bin/download.cgi/Results/184/filename/res.html along with many others on the Lindos test sheet database. I believe this result to be more accurate than the one you quote, as it was made with the microphone in my ear, and the microphone used is known to have a very flat bass response. A bump of only 3dB counts as 'very flat' in the world of speakers and headphones. Measurements made off the head can show different results due to different cavity resonances and damping. Unfortunately I have been banned from putting references to the Lindos Test Sheet Database on Wikipedia for the simple reason that I contributed to it. Links to results for the i-Pod and many other items, which I consider very valuable were taken down. You can legitimately put them up though if you wish! --Lindosland 09:33, 18 June 2006 (UTC)
thread_title: Measurements from Lindos

message: I have put up a revised set of contours because I feel that the graphic at the start should reflect the tru current position. This is a Lindos1.svg and being scalable-vector can be scaled to any size without loss. I have also ammended the text to explain the big errors that were discovered.
I have also created a new page 'Fletcher-munson curve' and transferred some of this page to there, with the old graphs, for the time being so that it is not lost. I will prepare proper F-M graphs and maybe also the R-D graphs for a Robinson-Dadson page too. Lindosland 22:45, 1 December 2005 (UTC)
thread_title:  Revised Graphs to ISO 226:2003 

message: I assume that the horizontal axis of the graph represents frequency, but it is not labelled. It would be helpful to label it... or add the units "Hz" to the figures.
I agree. I'll try to add that some time, though a lot of work went into creating the graphs (and others on other pages) and I might now want to do them all over again using Inkscape which I only discovered later. Inkscape is brilliant in allowing easy use of layers and enhanced svg output which is fully compatible with other drawing packages but retains full editability in Inkscape, ie it works in native svg unlike other packages that require saving in a different form for editing. --Lindosland (talk) 17:28, 21 November 2007 (UTC)
thread_title:  Graph labelling 

message: Does anyone know of any research on the psycho-physiological causes of the equal-loudness contour?  (ie. perhaps dampening of highly repeating signals on the auditory nerve, or an increase in those signals, networks in the brain that specifically habituate to "noise" and filter it out before it reaches consciousness, etc)  One would think there would be by now, given the prevalence of sound-sensitivity in autism spectrum disorders (..OR..). Jimw338 (talk) 15:07, 1 March 2012 (UTC)
replies: text: Muramukazi this happening now to Neshebra Danielle Wright my sound is on 47.44.45.162 (talk) 22:25, 23 July 2023 (UTC)
thread_title:  Research on psychological/physiological origins? 

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thread_title:  External links modified 

message: See previous discussion. ~Kvng (talk) 15:09, 4 April 2018 (UTC)
replies: text: ~Kvng (talk) 15:23, 21 May 2019 (UTC)
thread_title:  Merge from [[Fletcher–Munson curves]]