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Bob Cain
science forum Guru
Joined: 07 Jun 2005
Posts: 360
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 Posted: Fri Sep 16, 2005 4:39 am Post subject:
Re: In-ear microphones - Response to Gary Sokolich
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robert bristow-johnson wrote:
| Quote: | in article dgd1rv01cs2@enews3.newsguy.com, Bob Cain at
arcane@arcanemethods.com wrote on 09/15/2005 19:58:
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.
|
I hear you but if you read his response to my marker you may
understand why I've decided to mark all his stalking posts.
His bald face lies won't stand up to any scrutiny but should
I need to show the truth of the matter, as may become
necessary, I want to make it relatively easy. I should have
begun doing it long ago but...
I'm really sorry for the noise but there are good reasons.
What I can absolutely promise is that I will make no more
than one such response to each offense. They should be easy
to skip over without giving them any attention.
Bob
--
"Things should be described as simply as possible, but no
simpler."
A. Einstein |
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Angelo Campanella
science forum Guru Wannabe
Joined: 08 May 2005
Posts: 226
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| Posted: Fri Sep 16, 2005 5:56 pm Post subject:
Re: In-ear microphones
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Tony wrote:
| Quote: | How do you calibrate these?
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I think this has been answered OK with the pressure coupler comment.
Also, be aware that the B&K pistonphone kit includes adapters for 1/4"
and 1/8" microphones. The 0.1" diameter of the knowles unit implies that
a thin tape wrap around it should provide a snug fit into the B&K
pistonphone adapter. Note also that virtually all calibrators
manufactured in the US and worldwide have all adhered to the standard
adapter set practiced by B&K for some decades. This would be my choice...
Calibrators emitting a calibration level of 94 dB (1,000Hz), 102 dB
(1,000Hz), 114 dB (250Hz) and 124 dB (250Hz) are available today.
Angelo Campanella |
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TheGhost
science forum addict
Joined: 09 Aug 2005
Posts: 85
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| Posted: Fri Sep 16, 2005 11:58 pm Post subject:
Re: In-ear microphones - Response to Gary Sokolich
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"Porky" <noham@nospam.com> wrote in
news:jQpWe.1478$ha1.566@bignews6.bellsouth.net:
| Quote: |
"Gary Sokolich" <sokolich@google.com> wrote in message
news:6apWe.2883$Ob2.790@newssvr12.news.prodigy.com...
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.
|
The record also speaks loudly and clearly against you Mr. Mike Rieves.
Specifically, it reveals a litany of insults, false and defamatory
assertions, and ad hominem attacks that you have bestowed upon me during
the past couple of years. Your posting record in alt.music.home-studio
well as your present post here demonstrates unequivocally that the art of
vitriolic insults is your sole forte. Accordingly, you are hardly in a
credible position to be pointing the vitriolic insult finger at me.
Furthermore, on the basis of the record of your past posts in
alt.music.home-studio, if commenting knowledgeably in one post and then
spouting vitriolic insults in the next is an indication of serious mental
issues and the need for professional help, then you too have serious mental
issues and are in need of professional help. As a matter of
clarification, I did not "follow" Bob Cain to alt.music.home-studio as you
falsely assert. The truth of the matter is that I what I followed to
alt.music.home-studio was the controversial discussion involving the
Doppler distortion issue, portions of which were cross-posted to several of
the audio groups. As far as liking you and Bob, your are right. I don't
like either of you and I have nothing but the utmost contempt for both of
you; and both of you have either explicitly stated or demonstrated in your
past posts that the feelings are mutual. Regarding the issue of my
attacking Bob Cain, the truth of the matter is that Bob Cain has been
harassing and attacking me on the internet for the past five years. As
both you and Bob Cain know, I am not one to turn the other cheek, and Bob
Cain can expect more of the same venom that he has repeately dished out my
way in the past. Finally, as someone who has a long-standing history of
posting under the alias "porky" with an email address of noham@nospam.com,
you are hardly in a position to criticize anyone for faking their true name
and email address when posting. Furthermore, while I do not know how/why
you selected "porky" as your user name, you have certainly lived up to the
label as a swine in every/all sense/meaning of the word. |
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TheGhost
science forum addict
Joined: 09 Aug 2005
Posts: 85
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| Posted: Sat Sep 17, 2005 1:03 am Post subject:
Re: In-ear microphones
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Angelo Campanella <a.campanella@att.net> wrote in
news:qrFWe.259249$5N3.24415@bgtnsc05-news.ops.worldnet.att.net:
| Quote: | Tony wrote:
How do you calibrate these?
I think this has been answered OK with the pressure coupler
comment.
Also, be aware that the B&K pistonphone kit includes adapters for
1/4"
and 1/8" microphones. The 0.1" diameter of the knowles unit implies
that a thin tape wrap around it should provide a snug fit into the B&K
pistonphone adapter. Note also that virtually all calibrators
manufactured in the US and worldwide have all adhered to the standard
adapter set practiced by B&K for some decades. This would be my
choice...
Calibrators emitting a calibration level of 94 dB (1,000Hz), 102
dB
(1,000Hz), 114 dB (250Hz) and 124 dB (250Hz) are available today.
Angelo Campanella
|
The FET buffer that is built into the Knowles FG mic has an output dc
operating point that sits at approximately 300mV above ground. Since the
nominal sensitivity of the FG is 25mV/Pa, the maximum peak symmetrical
sound pressure that can be applied to FG and avoid clipping is
approximately 10Pa or equivalently 114dB SPL. Consequently the sensitivity
of the FG can not be accurately measured using a pistonphone such as the
Bruel & Kjaer 4220 which produces 124dB SPL. In fact, exposing the FG to
124dB SPL (ie 10dB overpressure) may actually damaged it. |
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Porky
science forum beginner
Joined: 25 Mar 2005
Posts: 41
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| Posted: Sat Sep 17, 2005 1:15 am Post subject:
Re: In-ear microphones - Response to Gary Sokolich
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"The Ghost" <theghost@hotmail.com> wrote in message
news:4LKWe.42942$R83.20164@fe04.news.easynews.com...
<snipped>
| Quote: | Furthermore, while I do not know how/why
you selected "porky" as your user name, you have certainly lived up to the
label as a swine in every/all sense/meaning of the word.
|
I chose the name "Porky" because it sounds like "por que" which is
Portuguese for "why" or "for what", which reflects my inquisitive nature. It
has nothing to do with swine. Have a nice life, Gary... |
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Bob Cain
science forum Guru
Joined: 07 Jun 2005
Posts: 360
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| Posted: Sat Sep 17, 2005 3:48 am Post subject:
Re: In-ear microphones
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The Ghost wrote:
| Quote: | Angelo Campanella <a.campanella@att.net> wrote in
news:qrFWe.259249$5N3.24415@bgtnsc05-news.ops.worldnet.att.net:
Tony wrote:
How do you calibrate these?
I think this has been answered OK with the pressure coupler
comment.
Also, be aware that the B&K pistonphone kit includes adapters for
1/4"
and 1/8" microphones. The 0.1" diameter of the knowles unit implies
that a thin tape wrap around it should provide a snug fit into the B&K
pistonphone adapter. Note also that virtually all calibrators
manufactured in the US and worldwide have all adhered to the standard
adapter set practiced by B&K for some decades. This would be my
choice...
Calibrators emitting a calibration level of 94 dB (1,000Hz), 102
dB
(1,000Hz), 114 dB (250Hz) and 124 dB (250Hz) are available today.
Angelo Campanella
The FET buffer that is built into the Knowles FG mic has an output dc
operating point that sits at approximately 300mV above ground. Since the
nominal sensitivity of the FG is 25mV/Pa, the maximum peak symmetrical
sound pressure that can be applied to FG and avoid clipping is
approximately 10Pa or equivalently 114dB SPL. Consequently the sensitivity
of the FG can not be accurately measured using a pistonphone such as the
Bruel & Kjaer 4220 which produces 124dB SPL. In fact, exposing the FG to
124dB SPL (ie 10dB overpressure) may actually damaged it.
|
This can be enhanced. The internal FET is a source follower
with external connection to the drain, to the source and to
the ground side of the 22k source resistor. It is self
biased such that Ids is a weak function of Vds (quiescent.)
Thus, a higher Vs can be used and additional resistance
can be placed between the "ground" connection and circuit
ground to effect a higher bias point and wider signal swing.
The Knowles engineer I communicated with about this capsule
in Feb 2003 said that the Vs max in the data sheet is
conservative and that the buffer's quiescent Vds should not
actually much exceed 3V so that with a supply of 6V and
additional source resistance adjusted to split that at the
source, the 22.4 mV/Pa (-53 dB Re 1V/.1Pa) sensitivity
specified on the data sheet gives, before electrical
clipping, 133.5 dB SPL max.
It is possible, though not terribly likely that the
diaphragm can physically clip at the backplate before this
limit but since this is a back electret design such physical
contact would not be destructive due to the dialectric
electret coating on the backplate.
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: Sun Sep 18, 2005 10:58 pm Post subject:
Re: In-ear microphones
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Bob Cain <arcane@arcanemethods.com> wrote in
news:dggao30215i@enews1.newsguy.com:
| Quote: | This can be enhanced. The internal FET is a source follower
with external connection to the drain, to the source and to
the ground side of the 22k source resistor. It is self
biased such that Ids is a weak function of Vds (quiescent.)
Thus, a higher Vs can be used and additional resistance
can be placed between the "ground" connection and circuit
ground to effect a higher bias point and wider signal swing.
The Knowles engineer I communicated with about this capsule
in Feb 2003 said that the Vs max in the data sheet is
conservative and that the buffer's quiescent Vds should not
actually much exceed 3V so that with a supply of 6V and
additional source resistance adjusted to split that at the
source, the 22.4 mV/Pa (-53 dB Re 1V/.1Pa) sensitivity
specified on the data sheet gives, before electrical
clipping, 133.5 dB SPL max.
It is possible, though not terribly likely that the
diaphragm can physically clip at the backplate before this
limit but since this is a back electret design such physical
contact would not be destructive due to the dialectric
electret coating on the backplate.
Bob
|
There is no such thing as a free lunch. If you demand a higher SPL limit,
you need to prepared to accept more distortion, which you conveniently fail
to mention. However, in light of yor past record of technical
incompetence, that minor oversight is certainly undersandable.
That having been said, you still don't know squat about microphone
calibration. |
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Gary Sokolich
science forum beginner
Joined: 15 Sep 2005
Posts: 15
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| Posted: Sun Sep 18, 2005 11:46 pm Post subject:
Re: In-ear microphones - Response to Gary Sokolich
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Bob Cain <arcane@arcanemethods.com> wrote in
news:dgdpaf022uq@enews3.newsguy.com:
| Quote: |
I hear you but if you read his response to my marker you may
understand why I've decided to mark all his stalking posts.
|
The truth of the matter is that your so-called "marking" is just your
latest tactic, involving lies and false assertions, in your ongoing and
five year old obsessive crusade to besmirch and defame me on the internet.
| Quote: | His bald face lies won't stand up to any scrutiny but should
I need to show the truth of the matter, as may become
necessary, I want to make it relatively easy. I should have
begun doing it long ago but...
|
Actally, began doing it long ago. I have a two-inch thick three ring binder
documenting the lies, false accusations, defamatory and libelous statements
about me that you have made on the internet during the past five years.
Based on the record it is your bald faced lies that won't stand up to
scrutiny.
| Quote: | I'm really sorry for the noise but there are good reasons.
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Name one.
| Quote: | What I can absolutely promise is that I will make no more
than one such response to each offense.
|
Translation: you will make no more than one annoying and offensive response
to my each of my posts.
| Quote: | They should be easy
to skip over without giving them any attention.
Bob
|
Excuse me while I reach for an air sickness bag because the truth of the
matter is that creating attention is your sole purpose. |
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Bob Cain
science forum Guru
Joined: 07 Jun 2005
Posts: 360
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| Posted: Mon Sep 19, 2005 8:56 am Post subject:
Re: In-ear microphones
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The Ghost wrote:
| Quote: | There is no such thing as a free lunch. If you demand a higher SPL limit,
you need to prepared to accept more distortion
|
Of course. I doubt anyone thought otherwise so it goes
without saying.
| Quote: | That having been said, you still don't know squat about microphone
calibration.
|
Depends on what kind of calibration. I know lots about
finding the audio band impulse response (frequency response)
of a microphone and compensating it because that is what is
important to my work and it is that to which I refered.
Absolute sensitivity calibration is, of course, different
and more useful for other applications like noise
measurement. I surmised the former and you are probably
correct that he intended the latter.
You simply don't know how to be civil, do you? A pity.
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: Tue Sep 20, 2005 11:01 pm Post subject:
Re: In-ear microphones
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Bob Cain <arcane@arcanemethods.com> wrote in
news:dgm5he0ebh@enews4.newsguy.com:
ship....snip
| Quote: | You simply don't know how to be civil, do you? A pity.
Bob
|
I am civil to those who are civil to me. The real pity is that you fail to
recognize your own blatant hypocrisy. You have been posting defmatory
comments about me on the internet for the past five years. You now falsely
accuse me of criminal behavior here and elswhere on a regular basis. And
you have the audacity to criticize me for not being civil to you. Your
arrogance is unbelievable and is clearly only superseded by your obvious
denial of reality.
BTW, were you still beating your x at the time she dumped you, or were you
only verbally and psychologically abusing her? |
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