Frequently
Asked Questions
To
page 2
On Tuesday, May 14, 2002 an
ENT Surgeon from Greece wrote the following:
Dear Mr Der
I came across your
interesting site while looking for information about how
to create an audiology room. I have a few crucial
questions and I would be grateful for any answers you
could give me.
I am setting up a private
ENT practice in what has until now been a residential
appartment. I have selected a room which I intend
to insulate as best as I can and also acoustically treat
to reduce reverberation. I intend to use it for
paediatric audiology testing, such as distraction
testing and VRA. I will create an observation
window in order to stay outside the room while
performing VRA.
Are there any minimum
numbers or set ratios for the length, width and height of
the room or any size would do for as long as it is
calibrated?
Are there any materials
which you could propose that are relatively thin yet
effective for sound insulation and/or acoustic
treatment?
Is it a realistic effort to
acoustically insulate a room with standard brickwalls by
lining the walls, ceiling and floor with insulating
material or do I really have to rebuild the walls in
order to make any difference? If the latter is the case,
will it make any difference to do this on the two walls
that I can (I cannot bring down the other four sides of
the room) or would this make no essential difference?
Do I have to keep the size
of the observation window to a minimum or does it not
really matter a lot for as long as it is specially made
for sound insulation?
Many thanks for taking the
time to read my e-mail! If there is anything else
you might think that I need to know, I would be grateful
for your advice.
Kind regards
My reply to this
international doctor can be found here.
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On April
14, 2002, an international reader from Ireland wrote:
Michael,
Could you please let me know
what you consider to be the difference between a sound
proof room vrs a sound treated room. Are there any stds
that call for a class 8 vrs a class 10 room?
I am mailing you from
Ireland so european stds would be the norm.
If you can help it will be
most appreciated.
My reply to this reader
can be found here.
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On March
14, 2002, an international reader from Australia
wrote:
Hi MIchael,
I'm from Burpengary which is
in Brisbane Australia. We are trialling a sound
field system in one of our classrooms at school and I
think it is great. My son could benefit from it
and there are many other students in the school as well.
We are trying to get a grant
from the government to fund it for each classroom and
need everybit of positive information we can find as we
only have till the end of this month to apply.
Any statistics from schools
, teachers comments you're recommendations etc.
Your help would be much
appreciated.
From a Concerned Mum,
My reply to this reader
can be found here.
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On February 19, 2002, an
international reader
from the Czech Republic wrote,
Dear Sir
Let me introduse myself - my name is XXXXXXXXX and I
work in Czech Metrology Institute (CMI), Brno, Czech
Republic, Europe. I'm Director of Regional Branch Brno
and the Head of laboratory of acoustics. More
information http://www.cmi.cz/index.php?act=159&lang=1
(I'm very sorry but it's just in Czech)
Now I'm working at NPL, Teddington, England for 3
months.
I try to compare standards which deal with the backround
noise levels in audiometric test rooms or booths.
In Europe we use standards ISO
8253-1,2 and 3, you
know them.
I've found ANSI S3.1 tables
in your website.
I've found somewhere that in that
"new"
ANSI standard are values for 31.5 Hz and 63Hz and also
for high frequency, above
8000Hz.
May I ask you for sending me of those values?
You
know, there won't be any demands for calibration
according
to ANSI standard in the Czech Rep., so therefore
I do not want to buy this one.
And
I want to finish that comparison this week....
In
the Czech Rep. we measure speech audiometry in the
sound field. And our standard is really very
strict.Especially at the low frequencies.
I'm
very sorry to bother you but I'm very interested in this
field because I'm
preparing some
national regulation for calibration of speech
audiometers. And
one of the most important thing is to measure background
noise.
Thank
you very much in advance
With
best regards
XXXXXXXXXX
My comments to this
reader are here.
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On January 30, 2002, an
international reader from the UK wrote,
Hello
I like the audiomtric pages, very good. Do you know, have
access to information, specification/suppliers on the
various couplers especially those used in the States. I am
familiar with the various IEC couplers (60318 parts 1,2
& 3, 60126, 60711 & 60373) but have little
information
on the 9A coupler and nothing on some of the other devices
that you mention (HA1, HA2 etc)
Regards
My comments to this reader are here.
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On January 11, 2002, a reader
from the United States wrote,
Hello, Just wondering if you ever
listened to ER-6's? Are the worth the price? I'm an
audiophile and would like to use them with an iPod. I
can't see buying the ER-4p's to use with an mp3 player.
My recommendation to this reader is here.
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On January 10, 2002 one of my
international readers from Australia wrote,
Hi Michael, thanks for an
informative website. My questions are in regards to
conducting a free field calibration:
Should we use dB(A) ie.
A-weighted or dB(lin) ie. unweighted when measuring and
calibrating the output at the different reference
frequencies?
Or should we just state the
corrections based on linear SPL measurements assuming
the people using the equipment will know how to apply
the appropriate corrections?
This will also affect the
choice of SLM used as an octave band filter will not be
needed when performing a calibration if A-weighted SPL's
are used (although I appreciate that octave band will
still be needed for background/ambient level
measurements).
I was also wondering if
there is as yet any standards in regards to free field
calibrations. I understand that in the US you call it
sound field calibration. Are there any European/ISO
standards in this regard? What are your recomendations
in terms of how often the free field calibration should
be conducted? The current Australian standard requires
booth backgrounds tested once every five years for
ears-covered audiometry, and as there is no standard for
free field, the general practice is also once every five
years, although audiometers and SLM's are generally
calibrated yearly.
I apologise for the long
winded nature of this email and thanks again for an
informative and useful website.
Regards,
My reply to this question can be
found here.
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On December 17, 2001,
one of my international readers from Korea wrote,
Dear
Sirs,
How
do you do Sir?
Your
internet site is very informative for us.
I
appreciate of your informations.
Can
you give informations on Radioear Corp (i.e. internet
hompepage, fax number, e-mail, and in-charge person) if
you have ?
Looking
forward to hearing you soon.
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information can be found here
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