sudeepjd
Posts: 2
Joined: Wed Nov 28, 2007 7:21 am

Data for Threshold of hearing curve

Postby sudeepjd » Wed Nov 28, 2007 8:31 am

I'm doing some research on noise reduction and need to superimpose a graph of the Threshold of hearing onto my graph to find at which freqencies I need to reduce the noise.

I would like to have the data from which the Treshold of hearing curves are being genereted. I been searching online but was able to only find the graphs and not the data.

Any help is appreciated. Thanks.

davidkallman
Former Expert
Posts: 675
Joined: Thu Feb 03, 2005 3:38 pm

Re: Data for Threshold of hearing curve

Postby davidkallman » Thu Nov 29, 2007 4:23 pm

Hi sudeepjd,

If you look at the following two sites:

http://www.answers.com/Threshold%20of%20hearing
you'll get graphs and measurement techniques

http://www.answers.com/topic/threshold- ... technology
you'll get a definition of the threshold (actually called audibility instead of hearing)

on both these pages please ignore the "Sponsored links," which are advisements. Thanks.
Cheers!

Dave

sudeepjd
Posts: 2
Joined: Wed Nov 28, 2007 7:21 am

Data for Threshold of Hearing

Postby sudeepjd » Fri Nov 30, 2007 6:29 am

Thanks for your response David,

I found the threshold of hearing graph on one of the pages on science buddies.

http://www.sciencebuddies.org/mentoring ... p007.shtml

It is the graph of the gain at each frequency band. The data is from several listners. I found this graph on several other sites as well but no data from which it has been generated. If somebody has that data I would like to have it.

We do a similar test to the "Catch Trial" test( 1st reference). We get people from different categories into a quiet room, present them with pairs of sounds and ask them which they prefer. From this we found out that the noise I am now trying to reduce is least preferable.

Sudeep.

davidkallman
Former Expert
Posts: 675
Joined: Thu Feb 03, 2005 3:38 pm

Re: Data for Threshold of Hearing

Postby davidkallman » Fri Nov 30, 2007 2:13 pm

Hi Sudeep,

No, I don't have the data. Here are four suggestions to getting data:

1. Look through the webpages in the sciencebuddies bibliography. I looked here, but couldn't find any data.
2. Same as #1 but see if there are ways suggested to get data. In (derived from the bibliography) there are four sites: http://www.neuro.uu.se/fysiologi/gu/nbb ... bFech.html has a formula, but it says that it’s not useful
http://en.wikipedia.org/wiki/Weber-Fechner_law
http://www.neuro.uu.se/fysiologi/gu/nbb ... evens.html
http://en.wikipedia.org/wiki/Stevens%27_power_law
3. See if you can communicate with the authors of the papers in #2 above and see if you can get their raw data. I understand this may be difficult, but I sense you're not a typical sciencebuddies participant since your occupation is listed as "Engineer."
4. Generate your own data. This would solve this issue we're trying to solve, but it's more expensive than the other methods. It is also subject to errors, and if you go this route, I urge you to compare the graphs of your data to the graphs in the referenced papers.
Cheers!

Dave


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