HDTenEightyP/NetNews huggingface dataset:
From: maufd@csv.warwick.ac.uk (Mr J S Graley)
Newsgroups: alt.sci.physics.acoustics
Subject: Speakers
Date: 16 Nov 1992 22:00:21 -0000
Organization: Computing Services, University of Warwick, UK
NNTP-Posting-Host: saffron.csv.warwick.ac.uk

I am trying to design loudspeakers from fundemental aucoustic laws. This has
been a harder task than I seemed initially. Most books on speakers skirt 
around the neccesarry explainations and simply give you final designs with
formulae for dimensions, but deducing the theory from this evidence is a
near herculean task!

I wonder if any people in the know about this could either post or email me
information or easy to obtain (eg in England) sources of info?

I interested in the following effects:

 Exponential horns

 Ported cavities

 Level of airload at various frequencies

 Effect of airload on driver efficiency
Newsgroups: alt.sci.physics.acoustics
From: daw@cray.com (Dave Wright)
Subject: Re: hearing vs speaking.
Organization: Cray Research, Inc.
Date: 18 Nov 92 13:28:56 CST

In article <1992Nov17.210853.14838@i88.isc.com> jeq@i88.isc.com (Jonathan E. Quist) writes:
>In article <Nov17.153055.54833@yuma.ACNS.ColoState.EDU> gw214790@LANCE.ColoState.Edu (Galen Watts) writes:
>>In article <1992Nov17.012614.20277@athena.mit.edu> philo@athena.mit.edu (philo) writes:
>>>lecturer once. One of the things that he said was that a spectrum analysis of the
>>>speach right near the ear of the listener did not agree with the spectrum of the
>>>sound as it left the mouth of the person who is talking. However, the fourrier
>>>components agreed to a large degree.
>>>
>>>Does any one have a better understanding of this concept that I do? I think
>>>this could be a very interesting question.
>>>-philo.
>>>dakhlak.... hawn nazl s suruur?
>>>				(Ziad)
>>
>>
>>Unless you were in an anechoic chamber, the reverberent field will always
>>change the frequency content of any acoustic signal.  High frequencies will
>>be attenuated by the air in the path from source to ear.  Also, the microphone
>>used to get the acoustic signal into the Fourier analyzer has a non-flat
>>frequency response.
>
>Any respectable lab setup will use a calibrated mic, and correct for
>that in the measurements.
>
>Of course, even ignoring all the other effects, there's the very real
>effect that the body (and head, for that matter) have on the
>percieved signal, as well as relative position and orientation of
>speaker and listener, all of which effect the spectrum of the signal
>in the ear.
>-- 
>Jonathan E. Quist                              INTERACTIVE Systems Corporation
>jeq@i88.isc.com  '71 CL450-K4 "Gleep", DoD #094        Naperville, IL
>        There are many things a person should experience in a lifetime.
>       Among them are an infant's first cry, and an infant's first laugh.


With MLSSA or TEF or even spectrum analyzers like ARIEL's the energy
reaching the measurment device can factor out the response of the
microphone knowing it's measurments. These devices can also sort out the
direct sound and reflections from the room or any surface reflector.

In response to the original post, I think what was being talked about is
the spectrum content of a voice is different on-axis coming out of the
mouth from off-axis such as by the ear. Anyone that has listened to
themselves over tape recorders such as Video or Phone anwsering machines
knows that we sound different to ourselves live than from these recordings
for many reason's acoustical and mechanical transmission through the body.

Dave Wright
Newsgroups: alt.sci.physics.acoustics
From: kdrolt@athena.mit.edu (Kenneth D Rolt)
Subject: Re: Speakers
Organization: Massachusetts Institute of Technology
Date: Tue, 17 Nov 1992 14:59:47 GMT

I entirely agree with Pierce's comments, and I want to reinforce the book
choices.  The book by McLachlan "Loud Speakers" is excellent, but very
hard to find.  The 1960 Dover edition is the one you want so you will have to
scour used book stores for it because it is out of print.
--------------------------------------------------------------------
	R   2	      Real Monza	     kdrolt@athena.mit.edu
	|___|					grad student !!
	|   |	'64 Corvair Convertible      mit ocean engineering
	1   3					underwater sound
--------------------------------------------------------------------
From: hubey@pilot.njin.net (Hubey)
Newsgroups: alt.sci.physics.acoustics
Subject: Formants of Speech
Keywords: Data needed
Date: 23 Nov 92 05:08:26 GMT
Organization: Rutgers Univ., New Brunswick, N.J.




Does anyone know where I can get some data on the formants
of vowels of various languages.  I've scanned through about
ten books and they usually have info on the first two
formants for English vowels.

I need more, at least, including the third formant. Can 
anyone direct me published sources ?

What would be even more interesting would be the formants
that are used in speech synthesizers.  I have some data
from a book on speech synthesis but it does not agree
very well with formants derived from experiments of humans
producing speech. If anyone knows how I can get the formants
used in any commercial or experimental speech synthesizers,
it would be very helpful.

Thanks very much.
-- 

	mark	


   hubey@pilot.njin.net                   hubey@apollo.montclair.edu
 ...!rutgers!pilot!hubey                  hubey@logos.montclair.edu
Newsgroups: alt.sci.physics.acoustics
From: philo@athena.mit.edu (philo)
Subject: hearing vs speaking.
Organization: Massachusetts Institute of Technology
Date: Tue, 17 Nov 1992 01:26:14 GMT

Hi,

in my wave mechanics class, we had an accoustics researcher come in as a guest
lecturer once. One of the things that he said was that a spectrum analysis of the
speach right near the ear of the listener did not agree with the spectrum of the
sound as it left the mouth of the person who is talking. However, the fourrier
components agreed to a large degree.

Does any one have a better understanding of this concept that I do? I think
this could be a very interesting question.



-philo.
-- 
.....................
dakhlak.... hawn nazl s suruur?
				(Ziad)
~~~~~~~~~~~~~~~~~~~~
Newsgroups: alt.sci.physics.acoustics
From: mb7s@fermi.clas.Virginia.EDU (Mikhail  Boukhny)
Subject: Re: hearing vs speaking.
Organization: University of Virginia
Date: Tue, 17 Nov 1992 14:56:59 GMT

I can't understand the difference between "spectrum analysis" and
finding "Fourier components".
Ear as a resonator changes Fourier spectrum quite a lot, in particular shifting
cutoff frequencies.
Michael.
Newsgroups: alt.sci.physics.acoustics
From: DPierce@world.std.com (Richard d Pierce)
Subject: Re: Speakers
Organization: The World Public Access UNIX, Brookline, MA
Date: Tue, 17 Nov 1992 04:24:17 GMT

In article <1e95llINN9gt@saffron.csv.warwick.ac.uk> maufd@csv.warwick.ac.uk (Mr J S Graley) writes:
>I am trying to design loudspeakers from fundemental aucoustic laws. This has
>been a harder task than I seemed initially. Most books on speakers skirt 
>around the neccesarry explainations and simply give you final designs with
>formulae for dimensions, but deducing the theory from this evidence is a
>near herculean task!
>
>I wonder if any people in the know about this could either post or email me
>information or easy to obtain (eg in England) sources of info?
>
>I interested in the following effects:
>
> Exponential horns
>
> Ported cavities
>
> Level of airload at various frequencies
>
> Effect of airload on driver efficiency

Much of the information you are looking for (at least on a theoretical
basis) is available in two relatively significant works:

    N. W. McLachlan, "Loud Speakers: Theory, Performance, Testing and
       Design," Dover, New York 1934 (1960 ed.)

    L. L. Beranek, "Acoustics," American Institute of Physics, New York,
       1954, 1986

There are also the landmark articles by A. N. Thiele and Richard H. Small,
available from the Audio Engineering Society Journal between 1971 and
1973. These are probably the most relevant sources for theory on how to
make the damn things work.

Unfortunately, as the vast market of mediocre to bad speakers illustrate,
it takes a lot more than this to design good loudspeakers. (actually, it
takes a proper understanding of this information to make things work,
something which the vast majority of engineers to not posess!).

-- 
|                Dick Pierce                |
|    Loudspeaker and Software Consulting    |
| 17 Sartelle Street   Pepperell, MA  01463 |
|       (508) 433-9183 (Voice and FAX)      |
From: hanners@oasys.dt.navy.mil (Robert Hanners)
Newsgroups: alt.sci.physics.acoustics
Subject: Re: REQ for INFO:  E P I R D
Date: 20 Nov 92 18:17:17 GMT
Reply-To: hanners@oasys.dt.navy.mil (Robert Hanners)
Organization: Carderock Division, NSWC, Annapolis, MD

In alt.sci.physics.acoustics, donna@filly.calstate.edu (Morag ni Shabhain) writes:
>If someone knows what this is, please send the information to my friend:
>    INTERNET:   Dori_Fujikawa@qm.calstate.edu
>What we know so far is that it is some sort of emergency signaling device
>used by ships at sea.

That should be EPIRB.  Read the "Solo Sailor Missing" thread in "Rec.boats".
		   ^
-- Bob

------------------------------------------------------------------------------
Robert J. Hanners         "My comments; only mine."          *DIASTOLE* 676673
CD, NSWC, Annapolis, MD                              hanners@oasys.dt.navy.mil
Newsgroups: alt.sci.physics.acoustics
From: DPierce@world.std.com (Richard D Pierce)
Subject: Re: Speakers
Organization: The World Public Access UNIX, Brookline, MA
Date: Fri, 20 Nov 1992 00:08:59 GMT

In article <1992Nov19.233034.25857@magnus.acs.ohio-state.edu> acampane@magnus.acs.ohio-state.edu (Angelo Campanella) writes:
>
>Look for a book by Harry(?) Olson.
>
>When he was at RCA around WWII, he did a good job at describing the practical
>amenities of loudspeaker design.
>
Yeah, he did a pretty good job. Except he was wrong about how bass reflex
systems work. And he was wrong about how passive radiator systems work,
and we was basically a few bricks short of a chimney describing sealed-box
direct radiators. He was dealing in an era where the understandings of
driver materials, radiation pattern, mutual driver-vent-cabinet
interactions, crossover netaorks and radiation patterns, cabinet
coloration, and so forth were either inheard of or, at best crudely hinted at.

Other than the fact that he got most of it wrong, yeah, he did a good job.

Let's not be to hard, though, on old Harry, he was one of the more
knowledgeable people of the day. But we have learned a hell of a lot since
his time. Yeah, the McLachlan book I recommended is from the same vintage,
but his is a hell of a lot more in terms of theory than Olson's, which is
what the original poster was looking for. And the very basic theory still
stands reasonably well.

>Other than that, keep in mind that all you are trying to do is to drive a
>parcel of air at an audio rate, with a plate (or horn) large enough to produce
>the sound power you want without nonlinear effects due to the compressibility
>of air.  (196 dB = 1 atmosphere).
>
>Most popular way has been a lightweight solenoid driven by reaction in a
>magnetic gap--- the common loudspeaker.
>
>Enclosures are merely to enhance the radiation over the lower range of
>frequencies, the higher being effected by direct radiation fron the driven
>plate ('cone').

This is a tremendous oversimplification of the real problems at hand but,
I presume (or I sincerely hope) they are, in fact, stated as such
intentionally.

By the way, I wouldn't sweat trying to reach 196 dB. That's the sound
pressure level of a Saturn V launch AT THE PAD. (Saturn V's were spec'ed
at producing about 6 million whats of acoustic power at sea level,
equivalent to about 189 dB SPL at close range. Might make for an
interesting surround-sound demo, though!)



-- 
|                Dick Pierce                |
|    Loudspeaker and Software Consulting    |
| 17 Sartelle Street   Pepperell, MA  01463 |
|       (508) 433-9183 (Voice and FAX)      |
Newsgroups: alt.sci.physics.acoustics
From: mwright@nyx.cs.du.edu (Matthew Wright)
Subject: Re: hearing vs speaking.
Organization: University of Denver, Dept. of Math & Comp. Sci.
Date: Tue, 17 Nov 92 15:00:49 GMT

philo@athena.mit.edu (philo) writes:

>in my wave mechanics class, we had an accoustics researcher come in as a guest
>lecturer once. One of the things that he said was that a spectrum analysis of the
>speach right near the ear of the listener did not agree with the spectrum of the
>sound as it left the mouth of the person who is talking. However, the fourrier
>components agreed to a large degree.

>Does any one have a better understanding of this concept that I do? I think
>this could be a very interesting question.

He may have been referring to near-field components of the source which would 
not radiate as efficiently or he may have meant to emphasise the fact
the power spectrum contains no phase information. Or something else?

Matthew Wright
Institute of Sound and Vibration Research
Newsgroups: alt.sci.physics.acoustics
From: ola@lesti.hut.fi (Ola Rinta-Koski)
Subject: Audio effect algorithms?
Organization: BREWTeX '92 -- International Boy Stout Organization
Distribution: alt
Date: 16 Nov 92 14:01:33

  I'm interested in the theory behind digital effects and would like
to learn more on how echo, chorus, flanger, phaser and other types of
effects are realized with DSP. Any pointers to literature?
--
 Ah, Sweet Mystery of Life.		//ola@vipunen.hut.fi
Newsgroups: alt.sci.physics.acoustics
Subject: REQ for INFO:  E P I R D
From: donna@filly.calstate.edu (Morag ni Shabhain)
Date: 20 Nov 92 10:04:17 PST
Distribution: world
Organization: The CSU

If someone knows what this is, please send the information to my friend:
    INTERNET:   Dori_Fujikawa@qm.calstate.edu
What we know so far is that it is some sort of emergency signaling device 
used by ships at sea.
Thank you. 

Donna



              
------------------------------------------------
|  Claimer:  These opinions may be mine.       |
------------------------------------------------
From: jxs18@po.CWRU.Edu (Jerry Sy)
Newsgroups: alt.visa.us
Subject: Re: Work permit for H4
Date: 21 Nov 1992 15:46:18 GMT
Organization: Case Western Reserve University, Cleveland, OH (USA)
Reply-To: jxs18@po.CWRU.Edu (Jerry Sy)
NNTP-Posting-Host: hela.ins.cwru.edu


In a previous article, arvind@smiles.mti.sgi.com (Arvind Bomdica) says:

>
>Hi,
>
>Does INS give temporary work permit for spouses with H4 visa ?

Yes they do.

>If so under what conditions do they approve such a thing ? 

the couple must have already filed for a greencard and waiting for an interview.

>
>I would appreciate if somebody can answer my questions.
>
>Thanks,
>
>Arvind.
>
>email address : arvind@mti.sgi.com
>

Newsgroups: alt.visa.us
From: grimaldo@tokyo.seri.philips.nl (Emilio Grimaldo)
Subject: Re: Married/employer sponsorship/temp work visa HELP!
Organization: Philips Semiconductors, The Netherlands 
X-Newsreader: Tin 1.1 PL4
Date: Fri, 20 Nov 1992 16:25:59 GMT

wallace@titan.trl.OZ.AU (Glenn Wallace) writes:
: grimaldo@tokyo.seri.philips.nl (Emilio Grimaldo) writes:
: 
: 
: >  The first thing american girls think is "he wants to marry me/be my boyfr.
: >  to get the green card and then dump me..." and that thought lives in their
: 
: Emilio, thanks for your opinion, BUT
: 
: Had it occurred to you that we might be getting married for love, not a
: green-card? That it is something we're choosing to do?
 
  Well, if she is there already and loving is one thing, but when I hear
  "to go to USA and work and get married" it all sounds like a dream to
  follow. Then it is always what THEY think, ah! there is always a nagging
  doubt lurking in the back of the brain...

: 
: [Also, my fiancee is 33 and probably objects to being called a 'girl'.
:  I'm a little more sanguine about the word 'girl', myself.]
: 
   So this is different, it is not go-and-chase. 
: >  (no more work permits!). Easy huh? no attitudes, because here the females
: >  tend to think the same way (but not as much as in USA)
: 
: Perhaps you are meeting the wrong 'girls'?
: 
   perhaps I did, but at the time I only needed a female friend, not 
   necessarily a girlfriend. Anyway, now I am on the other side of the ocean,
   and guess what I have no Dutch girlfriend for similar reasons, so I DO
   have a foreign one.

: >   Get your employer to do it, it will take some time but will be faster
: >   more likely and you will be in better position and feel better about
: >   yourself. Some people are money hungry!
: 
: Owww! You *are* meeting the wrong 'girls'.

   It is a thing of the past... anyway they never seemed consistent to me...
: 
: Again, thanks for your story.
: 
: Glenn

      Interesting debate, thanks for expressing your oppinions, I was fearing
      this was like talking to the wall :)
	    Emilio "Now somewhere else"

--
NAME:    D. Emilio Grimaldo T.                                   _/_/_/_/
EMAIL:   grimaldo@tokyo.sce.philips.nl                        _/_/_/ 
ADDRESS: PO Box 218,BE-543,5600 MD Eindhoven,The Netherlands   _/_/_/_/ 
------------------------------------------------------------------------------
     * * PERSONAL OPINIONS AND THEREFORE NOT REPRESENTING MY EMPLOYER * *
------------------------------------------------------------------------------
Newsgroups: alt.visa.us
From: yil@engr.ucf.edu (Yilmaz Cengeloglu)
Subject: Help about proving Perm. Res.
Organization: engineering, University of Central Florida, Orlando
Distribution: usa
Date: Sat, 21 Nov 1992 17:26:30 GMT



	Hi, 

	I have applied for PR 6 month ago and I am suppose to
	go to interview in February with my wife. 

	Currently, I have a job offer and they require
	permenant residency. They call me and ask 
	copy of my green card which I did not have yet. But
	I have PR visa  number and work permit which stamped
	to the I-94 form. 

	I do not have any kind of official paper that clearly
	state I am in process of getting green card. But I have
	to prove the company my immigration status. 

	I would be happy if anyone who has same experience 
	give me some suggestion.


						Yilmaz




Newsgroups: alt.visa.us
From: rdubey@yoda.eecs.wsu.edu (Rakesh Dubey - grad student)
Subject: Re: Anyone had applied for Practical training before?
Organization: Washington State University!
Date: Fri, 20 Nov 92 19:40:59 GMT

In article <1992Nov20.013633.21090@murdoch.acc.Virginia.EDU> hl2a@kelvin.seas.Virginia.EDU (Haiyan  Liu) writes:
>In article <1992Nov19.203549.21834@serval.net.wsu.edu> rdubey@yoda.eecs.wsu.edu (Rakesh Dubey - grad student) writes:
>>
>>authorization. You need not have any vaild job offer and either change
>>your visa status or leave the country after that year. There is nothing
>>that stops you from leaving US during that period.
>>
>>This employment is authorized by INS
>
>Do you mean that during practical traing, we can go overseas and come
>back to US with the F-visa without a job?
>
>Thank you very much
>.


Well, *theoretically* you can since there is nothing against it but if your 
visa is expired and you go to get a new one the consular officer may deny
you a new visa. Like if you have only couple of months of PT left.

You should discuss with a lawyer before doing anything like this.

-Rakesh

-- 
Rakesh Dubey
rdubey@yoda.eecs.wsu.edu
Newsgroups: alt.visa.us
From: grimaldo@tokyo.seri.philips.nl (Emilio Grimaldo)
Subject: Re: J-1 or H-1? is my wife being staved again?
Organization: Philips Semiconductors, The Netherlands 
X-Newsreader: Tin 1.1 PL4
Date: Mon, 23 Nov 1992 16:32:38 GMT

kalin@math.psu.edu ( kalin) writes:
: 
: My wife is from Spain and she has a tenure track, but she is still
: on the PT portion of her F-1.  She has been told by the person in charge
: of these things that it's easier ( for whom ?) to get a J-1 instead of 
: an H-1.  Though I am not an expert, I doubt this is smart, judging from
: the fact that I've seen people try to switch to an F-1 from a J-1.
: 
: Any comments?
: Bofors Weapon Systems 

       Beware of this tactics! one of the conditions of the J-1 visa is 
       that the holder MUST return the his/her own country for a period of
       at least one year, and during that period the ex-holder of the J-1
       visa CANNOT enter the USA.
--
From: zw10+@andrew.cmu.edu (Zheng Wang)
Newsgroups: alt.visa.us
Subject: Re: Request for FAQ
Date: 16 Nov 92 02:52:49 GMT
Organization: Carnegie Mellon, Pittsburgh, PA

I'd like to get a copy, too. Many thanx.

zw
From: bellutta@stromboli.ai.mit.edu (Paolo Bellutta)
Newsgroups: alt.visa.us
Subject: PR Lottery
Date: 17 Nov 1992 20:24:14 GMT
Organization: MIT Artificial Intelligence Lab
Distribution: world
NNTP-Posting-Host: stromboli.ai.mit.edu



I still have to get an aknowledge of my application for a Permanent Resident
visa with the "lottery" program, and given the date, it is unlikely I will get one.

Since I'm visiting my parents for Christmas (in Italy), I was worried
that I could be denied re-entry (I currently have a J-1, multiple entries)
since I applied for immigration.

How likely is this?

Newsgroups: alt.visa.us
From: grimaldo@tokyo.seri.philips.nl (Emilio Grimaldo)
Subject: Re: Entry from Canada -- was F1 Multiple denied in Ottawa!!
Organization: Philips Semiconductors, The Netherlands 
X-Newsreader: Tin 1.1 PL4
Date: Mon, 23 Nov 1992 16:28:44 GMT

marby@laura.harvard.edu (Craig Marby) writes:
: could go on.  You've heard more than enough. The moral is beware of
: the US Consulate in Montreal if you want a visa (or if you are not
: a US citizen).
: 
     Believe me, it is not only in Montreal this happens in US consulates
     in many, many places I have experienced similar things in Panama and
     The Netherlands. But well, what else can one expect from people that
     think that "The USA is the envy of the world", "USA is number 1" and
     this sort of bull S**T? I think they should come down to earth and
     learn some manners.

		 Emilio Grimaldo
		 grimaldo@tokyo.sce.philips.nl
: 
: --
: 
:     __o         
:   _ \<,_       Craig A. Marby    marby@layla.harvard.edu
:  (_)/ (_)      
: ~~~~~~~~~~

--
NAME:    D. Emilio Grimaldo T.                                   _/_/_/_/
EMAIL:   grimaldo@tokyo.sce.philips.nl                        _/_/_/ 
ADDRESS: PO Box 218,BE-543,5600 MD Eindhoven,The Netherlands   _/_/_/_/ 
------------------------------------------------------------------------------
     * * PERSONAL OPINIONS AND THEREFORE NOT REPRESENTING MY EMPLOYER * *
------------------------------------------------------------------------------
"Earth's largest project is also going wrong: humanity..." -me
"To love is to smell the fragance of a soul's inner beauty..." -me