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M J Carley
science forum beginner
Joined: 13 Sep 2005
Posts: 1
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 Posted: Tue Sep 13, 2005 1:22 pm Post subject:
In-ear microphones
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As it says in the title, I'm trying to source in-ear microphones for
use under a motorcycle helmet. Bruel and Kjaer make a set but I would
like to know if there are any others available which I could consider.
Thanks.
--
Differenza fra il rivoluzionaro e il cialtrone. Il rivoluzionario
rompe l'orologio e invece di presentarsi alle nove si presenta alle
nove meno cinque. Il cialtrone rompe l'orologio e si alza alle undici.
Home page: http://people.bath.ac.uk/ensmjc/ |
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TheGhost
science forum addict
Joined: 09 Aug 2005
Posts: 85
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| Posted: Tue Sep 13, 2005 5:06 pm Post subject:
Re: In-ear microphones
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ensmjc@bath.ac.uk (M J Carley) wrote in news:IMrHD4.AH6.B.midge@bath.ac.uk:
| Quote: |
As it says in the title, I'm trying to source in-ear microphones for
use under a motorcycle helmet. Bruel and Kjaer make a set but I would
like to know if there are any others available which I could consider.
Thanks.
|
Max SPL? Noise floor? Frequency range? Distortion? Stability and
sensitivity to environmental factors? Calibration requirements? Cost
constraints?
http://www.knowlesacoustics.com/knowlesacoustics-
apps/specialty_productdetail.do?product_id=7 |
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TheGhost
science forum addict
Joined: 09 Aug 2005
Posts: 85
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| Posted: Tue Sep 13, 2005 5:09 pm Post subject:
Re: In-ear microphones
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ensmjc@bath.ac.uk (M J Carley) wrote in news:IMrHD4.AH6.B.midge@bath.ac.uk:
| Quote: |
As it says in the title, I'm trying to source in-ear microphones for
use under a motorcycle helmet. Bruel and Kjaer make a set but I would
like to know if there are any others available which I could consider.
Thanks.
|
http://www.knowlesacoustics.com/images/data_sheets/FG.pdf |
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Didier A. Depireux
science forum beginner
Joined: 13 Sep 2005
Posts: 7
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Tony
science forum Guru Wannabe
Joined: 07 Sep 2005
Posts: 111
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| Posted: Wed Sep 14, 2005 8:24 am Post subject:
Re: In-ear microphones
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"The Ghost" <theghost@hotmail.com> wrote in message
news:0uFVe.40934$e95.7642@fe08.news.easynews.com...
How do you calibrate these?
--
Tony Woolf
My e-mail address has no hyphen
- but please don't use it, reply to the group. |
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Bob Cain
science forum Guru
Joined: 07 Jun 2005
Posts: 360
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| Posted: Wed Sep 14, 2005 4:21 pm Post subject:
Re: In-ear microphones
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The Ghost wrote:
| Quote: | ensmjc@bath.ac.uk (M J Carley) wrote in news:IMrHD4.AH6.B.midge@bath.ac.uk:
As it says in the title, I'm trying to source in-ear microphones for
use under a motorcycle helmet. Bruel and Kjaer make a set but I would
like to know if there are any others available which I could consider.
Thanks.
http://www.knowlesacoustics.com/images/data_sheets/FG.pdf
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These are great little capsules. I've used them for
measuring headphone response at entrance to the ear canal.
www.digikey.com was my source for them. If you get them be
sure and spend the extra dollars for the leaded ones.
Soldering leads to the tiny things is extremely difficult
with a high probablility of destruction. The solder pads
also detach very easily.
If you need to calibrate them against a reference mic they
can be mounted nearly coincident with it. Because of their
tiny size, their effect on the sound field is negligable in
the audio band.
Bob
--
"Things should be described as simply as possible, but no
simpler."
A. Einstein |
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TheGhost
science forum addict
Joined: 09 Aug 2005
Posts: 85
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| Posted: Wed Sep 14, 2005 5:53 pm Post subject:
Re: In-ear microphones
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"Tony" <news-reply@t-onywoolf.co.uk> wrote in
news:XTSVe.108436$G8.7398@text.news.blueyonder.co.uk:
I don't like the use of the term calibration because it means different
things to different people. If you mean, how does one measure sensitivity
and frequency response, the methodology will depend on both the frequency
range and the accuracy that is required. The sensitivity and frequency
response of the Knowles FG can be measured to better than 0.5dB accuracy
over the frequency range from 20Hz to 20KHz in a small cylindrical coupler
utilizing a Bruel & Kjaer 4136 as a reference microphone and a back-driven
Bruel & Kjaer 4134 as a sound source. Alternatively, you can measure it
under free-field conditions (using the method of substitution) against
either a Bruel & Kjaer 4135 at normal incidence or a Bruel & Kjaer 4136 at
90-degree incidence. In both approaches you will have to correct for the
magnitude and phase characteristics of the reference microphone that is
used. |
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GregS
science forum beginner
Joined: 30 Jun 2005
Posts: 47
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| Posted: Wed Sep 14, 2005 6:45 pm Post subject:
Re: In-ear microphones
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In article <fd%Ve.36785$s35.6255@fe09.news.easynews.com>, The Ghost <theghost@hotmail.com> wrote:
| Quote: | "Tony" <news-reply@t-onywoolf.co.uk> wrote in
news:XTSVe.108436$G8.7398@text.news.blueyonder.co.uk:
"The Ghost" <theghost@hotmail.com> wrote in message
news:0uFVe.40934$e95.7642@fe08.news.easynews.com...
ensmjc@bath.ac.uk (M J Carley) wrote in
news:IMrHD4.AH6.B.midge@bath.ac.uk:
http://www.knowlesacoustics.com/images/data_sheets/FG.pdf
How do you calibrate these?
I don't like the use of the term calibration because it means different
things to different people. If you mean, how does one measure sensitivity
and frequency response, the methodology will depend on both the frequency
range and the accuracy that is required. The sensitivity and frequency
response of the Knowles FG can be measured to better than 0.5dB accuracy
over the frequency range from 20Hz to 20KHz in a small cylindrical coupler
utilizing a Bruel & Kjaer 4136 as a reference microphone and a back-driven
Bruel & Kjaer 4134 as a sound source. Alternatively, you can measure it
under free-field conditions (using the method of substitution) against
either a Bruel & Kjaer 4135 at normal incidence or a Bruel & Kjaer 4136 at
90-degree incidence. In both approaches you will have to correct for the
magnitude and phase characteristics of the reference microphone that is
used.
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Are there any charts of their response curves on the internet?
greg |
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TheGhost
science forum addict
Joined: 09 Aug 2005
Posts: 85
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| Posted: Wed Sep 14, 2005 7:42 pm Post subject:
Re: In-ear microphones
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szekeres@pitt.edu (GregS) wrote in
news:dga263$hs1$1@usenet01.srv.cis.pitt.edu:
| Quote: | In article <fd%Ve.36785$s35.6255@fe09.news.easynews.com>, The Ghost
theghost@hotmail.com> wrote:
"Tony" <news-reply@t-onywoolf.co.uk> wrote in
news:XTSVe.108436$G8.7398@text.news.blueyonder.co.uk:
"The Ghost" <theghost@hotmail.com> wrote in message
news:0uFVe.40934$e95.7642@fe08.news.easynews.com...
ensmjc@bath.ac.uk (M J Carley) wrote in
news:IMrHD4.AH6.B.midge@bath.ac.uk:
http://www.knowlesacoustics.com/images/data_sheets/FG.pdf
How do you calibrate these?
I don't like the use of the term calibration because it means
different things to different people. If you mean, how does one
measure sensitivity and frequency response, the methodology will
depend on both the frequency range and the accuracy that is required.
The sensitivity and frequency response of the Knowles FG can be
measured to better than 0.5dB accuracy over the frequency range from
20Hz to 20KHz in a small cylindrical coupler utilizing a Bruel & Kjaer
4136 as a reference microphone and a back-driven Bruel & Kjaer 4134 as
a sound source. Alternatively, you can measure it under free-field
conditions (using the method of substitution) against either a Bruel &
Kjaer 4135 at normal incidence or a Bruel & Kjaer 4136 at 90-degree
incidence. In both approaches you will have to correct for the
magnitude and phase characteristics of the reference microphone that
is used.
Are there any charts of their response curves on the internet?
greg
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Representative frequency response (pressure) plots for the various versions
are given in the data sheet at:
http://www.knowlesacoustics.com/images/data_sheets/FG.pdf
Because of its very small size, there is very little difference between the
pressure response and the free field response, and then only at the higher
audio frequencies (10KHz-20KHz). If you need to know the free field
response for various angles of incidence at high frequencies you will have
to measure it directly for each capsule because there is considerable
variability in the pressure response itself at high frequencies. |
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\"\"
science forum beginner
Joined: 15 Sep 2005
Posts: 1
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| Posted: Thu Sep 15, 2005 9:19 pm Post subject:
Re: In-ear microphones
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Bob Cain <arcane@arcanemethods.com> wrote in
news:dg9pn102r6s@enews4.newsguy.com:
| Quote: | If you need to calibrate them against a reference mic they
can be mounted nearly coincident with it. Because of their
tiny size, their effect on the sound field is negligable in
the audio band.
Bob
|
You clearly don't know much about the subject of microphone calibration. |
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Bob Cain
science forum Guru
Joined: 07 Jun 2005
Posts: 360
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| Posted: Thu Sep 15, 2005 9:58 pm Post subject:
Re: In-ear microphones - Response to Gary Sokolich
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Gary Sokolich wrote:
His usual venom.
"" is actually Gary Sokilich. He stalks me in all usenet
groups in which I participate. Please ignore him and this
most recent marker of his stalking.
Bob
--
"Things should be described as simply as possible, but no
simpler."
A. Einstein |
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robert bristow-johnson
science forum Guru Wannabe
Joined: 02 May 2005
Posts: 105
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| Posted: Thu Sep 15, 2005 10:34 pm Post subject:
Re: In-ear microphones - Response to Gary Sokolich
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in article dgd1rv01cs2@enews3.newsguy.com, Bob Cain at
arcane@arcanemethods.com wrote on 09/15/2005 19:58:
| Quote: |
Gary Sokolich wrote:
His usual venom.
"" is actually Gary Sokilich. He stalks me in all usenet
groups in which I participate. Please ignore him and this
most recent marker of his stalking.
|
Bob, the best way to ignore him is to really ignore him. at least that's
how i see it. maybe if someone gets sucked into a bad post of his, we can
try to respond to that person (or that person and every other poster in that
thread save Gary) directly with e-mail.
now i will try to practice what i preach.
--
r b-j rbj@audioimagination.com
"Imagination is more important than knowledge." |
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Gary Sokolich
science forum beginner
Joined: 15 Sep 2005
Posts: 15
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| Posted: Thu Sep 15, 2005 11:25 pm Post subject:
Re: In-ear microphones - Response to Gary Sokolich
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Bob Cain <arcane@arcanemethods.com> wrote in
news:dgd1rv01cs2@enews3.newsguy.com:
| Quote: |
"" is actually Gary Sokilich. He stalks me in all usenet
groups in which I participate. Please ignore him and this
most recent marker of his stalking.
Bob
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The truth of the matter is that you have been stalking and harassing me on
the internet for the past five years. Furthermore, as the Google record
clearly demonstrates, when it comes to technical commentary, you are the
one who should be ignored. |
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Gary Sokolich
science forum beginner
Joined: 15 Sep 2005
Posts: 15
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| Posted: Thu Sep 15, 2005 11:28 pm Post subject:
Re: In-ear microphones - Response to Gary Sokolich
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robert bristow-johnson <rbj@audioimagination.com> wrote in
news:BF4F8B6F.A6E8%rbj@audioimagination.com:
| Quote: |
Bob, the best way to ignore him is to really ignore him. at least
that's how i see it. maybe if someone gets sucked into a bad post of
his, we can try to respond to that person (or that person and every
other poster in that thread save Gary) directly with e-mail.
now i will try to practice what i preach.
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Thank you for that profound commentary. Now go wipe that brown streak off
your nose. |
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Porky
science forum beginner
Joined: 25 Mar 2005
Posts: 41
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| Posted: Fri Sep 16, 2005 12:12 am Post subject:
Re: In-ear microphones - Response to Gary Sokolich
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"Gary Sokolich" <sokolich@google.com> wrote in message
news:6apWe.2883$Ob2.790@newssvr12.news.prodigy.com...
| Quote: | Bob Cain <arcane@arcanemethods.com> wrote in
news:dgd1rv01cs2@enews3.newsguy.com:
"" is actually Gary Sokilich. He stalks me in all usenet
groups in which I participate. Please ignore him and this
most recent marker of his stalking.
Bob
The truth of the matter is that you have been stalking and harassing me on
the internet for the past five years. Furthermore, as the Google record
clearly demonstrates, when it comes to technical commentary, you are the
one who should be ignored.
|
The record does indeed speak for itself, and it speaks loudly and clearly
against you Dr. Sokolich, as anyone who has done the research knows. I've
been killfiling any message you post in alt.music.home-studios, where you've
been trolling ever since you followed Bob Cain there, so I don't even see
your posts there anymore..
I've been lurking here for a while, watching you post knowledgably in one
post and then spout vitriolic insults in the next, and I'm now certain that
you have serious mental issues and I think you should seek professional
help. Bob is posting on-topic, in response to others here, and it is you who
are attacking him, as everyone here can plainly see. If you don't like Bob,
or me, or anyone else, why not just ignore them? They certainly aren't
attacking you.
I apologize to everyone else, and I'll now go back to lurking. Don't bother
to reply Dr. Sokolich, or the Ghost, or "", or Wondering, or whatever other
alias you may choose because you're now in my killfile here as well. |
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