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Re: Normal hearing
It has been pointed out to me that what I wrote is not normal hearing in itself
but is the standard reference for sound pressure which is used for either spl or
htl measures with htl being based on spl measures. Well, not quite that much
was pointed out. I thought my remider would be sufficient but as it is
apparently not, let me state what is in any freshman level audiology textbook.
The 0.0002 measure is the reference used for standard measures used for
calibration of audiometric equipment. Any basic audiology text will show the
table which is used to convert it to exact spl output levels for "normal" human
hearing in a young population of roughly between ages 18-25 although reference
tables are available for other groups but are based on that 0.0002 reference
level. Of course, all of the above assumes particular equipment under fairly
specific conditions with specific presentation types usually being pure tones.
Newby or Martin are good basic reference authors for this kind of information
and Northern and Downs are good references for ped differences etc.
Tom Brennan KD5VIJ, CCC-A/SLP
web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html
On Fri, 15 Apr 2005, Thomas G Brennan wrote:
> Date: Fri, 15 Apr 2005 10:09:48 -0500
> From: Thomas G Brennan <g_brennantg@xxxxxxxxxxxxxxx>
> To: AUDITORY@xxxxxxxxxxxxxxx
> Subject: Re: Normal hearing
> 0.0002 dyne per cm sq
> Tom Brennan KD5VIJ, CCC-A/SLP
> web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html
> On Fri, 15 Apr 2005, Nathan Weisz wrote:
> > Date: Fri, 15 Apr 2005 10:35:56 +0200
> > From: Nathan Weisz <nathan.weisz@xxxxxxxxxxxxxxx>
> > To: AUDITORY@xxxxxxxxxxxxxxx
> > Subject: Normal hearing
> > Hi,
> > does anybody know any resources (other than running a dozen of subjects)
> > about which hearing thresholds are to be considered normal when
> > measuring with *SPL*?
> > Thanks in advance.
> > Best,
> > Nathan