HDTenEightyP/NetNews huggingface dataset:
From: hlj@hal.nta.no (Harald Ljoen FBA)
Subject: Re: Defeating SCMS
Reply-To: harald.ljoeen@nta.no
Organization: Norwegian Telecom Research
Date: Mon, 9 Nov 92 11:51:25 GMT

In article <1dkkpiINNgua@usenet.INS.CWRU.Edu>, jwk3@po.CWRU.Edu (John W. Kale) writes:
>	Do DAT decks place SCMS codes on recordings made from the
>analog inputs? If they do not, then simply connecting the analog outputs
>on the CD player to the analog inputs on the DAT deck should
>result in a high-quality recording with no limit on the number
>of digital generations it can, uh, generate. I realize that this
>falls short of the holy grail of a perfect digital copy, but I
>would guess that any degradation would be quite small.

SCMS allows digital copies to be made up to and including second generation.
An analog recording is marked as first generation from which you can make
digital copies. You can *not* make digital copies from the second generation
copies. A CD copied to DAT is a second generation copy, and can not be copied
digitally.

-- 
** Also sprach harald.ljoeen@nta.no **
From: syd@en.ecn.purdue.edu (Dennis P Hilgenberg)
Newsgroups: rec.audio
Subject: Re: Why filter D/A output?
Date: 12 Nov 92 20:11:44 GMT
Organization: Purdue University Engineering Computer Network

philg@martigny.ai.mit.edu writes:

>Driving a nonlinear, i.e. distorting, system, i.e. amplifier/speaker,
>with a single frequency produces an output made up only of that
>frequency and its harmonics.  This can be shown easily by looking at a
>Taylor series expansion of a nonlinear function and seeing what
>happens to cosine squared and cosine cubed terms (use trig
>identities).

This is [mathematically] not true in general.  
Example: f(x) = arccos (x).  The output of such a system 
when x = cos(t) is simply t, which is not periodic, and
hence does not have a Fourier series expansion.

One could be more obnoxious by letting f(x) = cos (1.5 arccos(x)).

The Taylor series must converge at every point in order for this
argument to work.  (Note that arccos (x) does not meet this requirement.)
A sufficient condition for this is that the nonlinearity be continuous.
(In the real world, this is probably a valid assumption.)

-- 
Dennis Hilgenberg
syd@ecn.purdue.edu
LaRouche in '96
From: pdm@sisters.cs.uoregon.edu (peter d. mark)
Newsgroups: rec.audio
Subject: disc-man type cd players
Date: 10 Nov 92 19:59:25 GMT
Article-I.D.: cs.1992Nov10.195925.10623
Organization: University of Oregon Computer and Information Sciences Dept.

i'm considering buying an inexpensive  portable cd player
along the lines of  sony's diskman to plug into a small boombox
i keep in the office.  can anyone recommend one brand of such
things over another?

please respond via e-mail, reading these groups is now a major
effort since i must telnet to a remote site to do so.

thanks
peter
pdmark@colby.edu (reply to this address)
From: kirk@hpcc01.corp.hp.com (Kirk Lindstrom)
Date: Tue, 10 Nov 1992 17:22:40 GMT
Subject: Re: PNP vs NPN Output Stages
Organization: Shredding the water of SF Bay, HP-OCD
Newsgroups: rec.audio

>***** if you like Bach use NPN *****
>***** if you like Chopin use PNP ***
>
>We are currently working on an output design that allows the audiophile
>to switch between NPN and PNP output stages depending upon taste and
>source material, with a hybrid NPN/PNP transistor for those who like
>Elgar.
>
I would think the switch would do more harm.  Also, would you keep the
non-active outputs on with a dummy load?  Cost would be higher due to the
extra heat-sinking requirements.

>We believe this effect owes to the higher speed of electrons through an
>N-type junction being relativistically effected (by the uncertainty
>principle) leading to noise and distortion, particularly noticeable at
>low frequencies.
>
>Has anyone else observed this effect, and can they shed any light on the
>cause?
>
Hmmmm.  Look into 1/f noise in the literature.  Maybe you'll find something
there.  I would suspect that parasitic resistances are different for the
two devices and end up effecting slew rate thus sound.  I've heard of
"fast amps" and "slow amps", but not looked into them much.

What transistors are you using and what are their model parameters?

>Rob Bish.
>----------

Kirk out
=> "We are what we pretend to be."  -  Kurt Vonnegut Jr.
+---------------------------------------------------------------------+
| Kirk Lindstrom - OCD Product R & D | Hewlett-Packard Co.  M/S: 91UA |
|   Engineer/Scientist, Hardware     |                                |
|------------------------------------| Optical Communication Division |
|       kirk@hpoclpa.hp.com          |                                |
|    Kirk Lindstrom / HP0100/UX      | 370 W. Trimble Rd.             |
| ph 408 435 6404 | fax 408 435 6286 | San Jose, CA  95131-1096       |
+---------------------------------------------------------------------+
From: chakng@amberwood.Eng.Sun.COM (Chakchung Ng)
Newsgroups: rec.audio
Subject: Re: Pro Logic Center channel speakers
Keywords: pro logic
Date: 10 Nov 92 18:44:03 GMT
Organization: Sun Microsystems, Mt. View, Ca.
NNTP-Posting-Host: amberwood

I have been seeing a lot of discussion of adding a center channel speaker to
an existing system but not a post (I might missed them) about using the
existing system. The existing system here is the TV set it self. Most TV come
with their own speakers and would like to hear opinions about using those
speakers as center channel speakers.

Thanks,

Chak
Newsgroups: rec.audio,rec.video
From: peterco@eff.org (Peter Cohen)
Subject: JVC RM-S1 Remote Wanted
Originator: peterco@eff.org
Organization: The Electronic Frontier Foundation
X-Newsreader: TIN [version 1.1 PL6]
Date: Wed, 11 Nov 1992 03:13:51 GMT

If you have a mint condition JVC RM-S1 remote control, and you want to
sell it, please email me at peterco@eff.org.  I'd like to get one for
myself for Christmas...
-- 
+-----------------+------------------------------------------------+
| Peter A. Cohen  |   No, I don't reflect my employer's opinions.  |
| peterco@eff.org | Heck!  My employer doesn't even know I'm here! |
+-----------------+------------------------------------------------+
Newsgroups: rec.audio
From: p0p4018@zeus.tamu.edu (PREMTHAMKORN, PRAKIT)
Subject: Help: Large Heatsink Suppliers
News-Software: VAX/VMS VNEWS 1.41    
Organization: Texas A&M University, Academic Computing Services
Date: Thu, 5 Nov 1992 17:12:00 GMT

I am collecting parts to build a power amplifier.  I am having difficulty 
finding large heatsink for the output transistors (TO-3 type MOSFET).  
Preferably, it should rate 2-3 C/Watt or larger.  Any help to locate a supplier
would be greatly appreciated.  Thank you very much.

Prakit 
Newsgroups: rec.audio
From: herrick@news.cis.ohio-state.edu (scott m herrick)
Subject: 1.  amp kits    2.  potentiometers
Organization: The Ohio State University Department of Computer and Information Science
Date: Mon, 9 Nov 1992 18:52:31 GMT

I am in need of anyone who can offer help with a couple of questions:

1.  Is there anyone who produces amplifier kits?  I am looking for something in the range of 80 to 100 W/ch.  A phone number for address for a catalog request would be great.

2.  I am also looking for a potentiometer with two separate wipers.  I wish to use it on a gain control for an active x-over (to control both channels simultaneously).  I have searched in vain but with no luck.  Again, a phone number or address would greatly be appreciated.

I check both my email and the net daily, so I have no preferances for responding.

Thanks Again,


Scott


Newsgroups: rec.audio
From: wcsanil@superior.carleton.ca (Anil Prasad)
Subject: Anyone know of a decent "all-in-one" mini recorder?
Organization: Carleton University, Ottawa, Canada
Date: Sat, 7 Nov 1992 22:59:07 GMT

I've been using an ancient Sony recorder for some journalism stuff
I do, and I believe it's finally about to die. It was a brilliant
recorder in its time and was capable of making the most incredible
live concert recordings. It had some sort of ultra-dynamic condenser
mike in it.

At any rate, I'd like to get a modern equivalent. Can someone
recommend a current mini recorder that can make really hot-sounding
recordings? Obviously, I'm not talking about something that uses
"micro-cassettes" but something that utilizes regular cassettes.
If it has dolby capability, that would be even better. Hopefully
we're looking at something the size of a walkman.

If you have any ideas, please let me know.

Thanks,

Anil Prasad
wcsanil@ccs.carleton.ca


Newsgroups: rec.audio
From: deanc@boi.hp.com (Dean Cashen)
Subject: Re: DCC, MD Limitations
Organization: Hewlett-Packard
Date: Thu, 12 Nov 1992 00:19:16 GMT

In article <27396@oasys.dt.navy.mil> curt@oasys.dt.navy.mil (Curt Welch) writes:
>
>Yeah, right.  You imply that MD and DCC will throw out
>these sounds.  Why do you think they will do this? (other than
>your obvious dislike for the concept of compression.)

MD & DCC *do* lose data.  They use a form of compression which
selectively discards certains sounds believed to lie below
the level of perception.  It's not a lossless compression
algorithm; the original poster was correct.

>
>Hey, I haven't heard MD or DCC.  I don't know if it's going to work and
>I don't know if I'm going to like it.  But I don't start making up
>stupid reasons why it "can't" work before I've even heard them.

I don't see where he ever said it "can't work."  He did bring out
the subtle nuances of the format which could, and likely will,
affect the sound quality.  (And he did it *nicely* -- there's a lesson
to be learned there. . .)  Even marketing for these products places
them at the lower-end of the audio spectrum when sound quality is
concerned.

>
>These units won't be much harder to use than cassette recorders.

They offer additional features which allow you to reorder already-
recorded selections, add labels, and so forth.  The VCR analogy is
valid in my book; extra features make a product more complicated, and
people haven't yet mastered what should be simple, such as VCR recording.

>
>Ever notice how well DAT sales are going?  Did you every stop to think that
>people might want more than sound quality?

True, the average person isn't overly concerned over absolute quality.
Price and features seem to rank highest.  However, DAT's lack of success
is probably attributable to the legislation which prevented it from being
sold in the U.S. in a consumer form.  Remember?

>
>Curt Welch

Regards,

Dean Cashen
-- Boise
From: lcc@po.CWRU.Edu (Lih C. Chen)
Newsgroups: rec.audio
Subject: SHIPPING CD PLAYERS VIA USMAIL OR UPS OR THE LIKE
Date: 10 Nov 1992 07:31:00 GMT
Organization: Case Western Reserve University, Cleveland, OH (USA)
Reply-To: lcc@po.CWRU.Edu (Lih C. Chen)
NNTP-Posting-Host: hela.ins.cwru.edu


Howdy.  I am shipping my Denon DCM-320 player to a buyer (which means
that, by the way, it is SOLD) and my question is

 Do I need to protect any moving parts from being damaged, if I'm 
sending it back using its original box?

Reply in mail asap, please.
S'il vous plait.

Thanks!
-- 
I live my life like there's no tomorrow--DLR
                          If you got a blacklist, I want to be on it--BB
It is better to look good than to feel good--F
			  Let there be light--G
From: mike@banana.fedex.com (Mike Bearden)
Newsgroups: rec.audio
Subject: Eminent Tech VI's For Sale
Date: 9 Nov 92 22:55:16 GMT
Distribution: rec
Organization: Federal Express Corp.









     A friend of mine is selling his speakers.  Call him at the numbers
     below for details.

     Eminent Technology LFT-VI Speakers
     
     New - $3250

     Price:  $1650

     Light Oak Finish
     6 months old

     Call Ted Tolleson

     (901)353-7258 Days
     (901)753-6055 Nights
Newsgroups: rec.audio
From: shiv@bnr.ca (Shiv Naimpally)
Subject: Re: MD and DCC
Reply-To: shiv@bnr.ca (Shiv Naimpally)
Organization: Bell-Northern Research Ltd.
Date: Fri, 06 Nov 92 16:48:22 GMT

I was at the library the other day and just about every other
issue of mags like Audio and Stereo Review have articles on
MD and DCC.  SR May '92  comes to mind at the moment. 
Newsgroups: rec.audio
From: pat@wrs.com (Patrick Boylan)
Subject: Re: portable CD player and new Sony ESP
Reply-To: pat@wrs.com
Organization: Wind River Systems
Distribution: na
Date: Thu, 12 Nov 1992 17:56:28 GMT

goldberg@oasys.dt.navy.mil (Mark Goldberg) writes:

>In rec.audio, sorsha@wam.umd.edu (Dreaming) writes:
>>I realize this is an FAQ, but does anyone have a recommendation for
>>buying a portable CD player?  I lean towards one that can be used in a
>>car as well, but that's not necessary.
>>More specifically, I have a catalog that lists the Sony CarDiscman  ....

>I recommend the CarDiscman for genral portable use.  There are three
>models - the 180, the 802, and the 808.  I think the 180 has been discontinued
>and is stilled being sold by some at a discount, ususally under 200.
>I personally have the 802; it's essentially a good no-frills player
>with lighted controls (only when external power is used) and MegaBass.
>It takes standard AA batteries.  It is supplied with a cassette adapter
>and both AC and car DC power adapters.  I'm very pleased with it's performance
>and it handles all but the ost severe bumps.  I use nicad batteries
>and leapfrog two sets; an external (not supplied) charger is used.
>The 808 is  little thinner and has programming and compression.  It
>costs about 70 more.

>My opinion ia that you need a Car Discman for true portability.  The
>others are merely trans-protable, but won't play when carried and require
>a stable surface.

For off-road use (i.e. Baja), I just saw the newest Sony portable in Japan 
last week.  It includes what they call ESP (Electonic Shock Protection).
This effectively buffers the music so that a hit to the player will not 
affect the music.  It it loses track of the music, it can recover before the 
buffer empties.

I played with it for a while, bumped it around, and tried to make it skip.
I finally succeeded but only by continuously hitting the unit for a few 
seconds (not a typical real-world scenario).  It works.

So if you want to jog or go mountain biking with your discman this is the 
one to get.  The model number is D-505 or D-515 I think but it has "ESP" 
marked on it somewhere anyway.

Best price I could find was equivalent to about $325 USD.

Has anyone seem it in the US yet?

- Patrick
-- 
 Patrick Boylan, Consulting Engineer, FAE Asia/Pacific
 Wind River Systems
 1010 Atlantic Ave. Alameda, CA  94501
 email: pat@wrs.com   tel: (510)748-4100   fax: (510)814-2010
Newsgroups: rec.audio
From: hunter@work.nlm.nih.gov (Larry Hunter)
Subject: Re: Passive Bi-amping
Organization: National Library of Medicine
Date: 5 Nov 92 19:13:13


Ray Wakeland asks about bi-amping speakers that have a pair of terminals (one
for the upper range drivers and one for the woofers).  JJ (the curmudgeon)
calls these "bi-wiring" jacks and says:

 Yes, you can do that, BUT ... you will gain nothing from the most important
 features of bi-amping, those being 1) Freedom from overload being communicated
 across frequency, i.e. overload will happen (most amps being voltage amps)
 because of the voltage level, regardless of current, because the entire audio
 signal is present at both amp's output.  2) You gain nothing from the ability
 to make an electronic crossover, and use the various flexibilities one can get
 from having an active network with well-controlled impedences.

And Ray asks about Norm Strong's comment that "aftermarket" active crossovers
can be inferior to the installed passive crossovers because the original
crossover was designed for the particular drivers in the speaker, to which JJ
responds:

  It eliminates Norm's comments, but it also avoids all the positive effects of
  bi-amping, and requires two amplifiers anyhow.

Although JJ is basically right, he missed the possibility of getting the best
of both worlds.  I use a true biamp setup (active crossover & two amps) but
also take advantage of the "biwiring" jacks.  The biwire tap into the passive
crossover in my Duntechs is at about 300Hz (I forget the exact number, but for
the example, it doesn't matter.)  So I set the knee of the high pass of the
active crossover to about 250Hz (or whatever it actually is) at 18dB/octave and
the knee of the low pass to about 400Hz at 18dB/octave.  Each of these signals
gets sent to its own amp, gaining advantage (1) that JJ lists above -- awesome
power handling capability.  Then the amp outputs get sent to the appropriate
speaker terminals, where the stop band is just the difference between the
active crossover's output and the transition in the passive crossover, a
relatively narrow band.  This way, the designed passive crossover is still
determining exactly what the drivers see (as Strong suggests is a good idea),
but each of the amps sees only a reduced signal bandwidth (as JJ observes, the
main advantage of bi-amping).

			Larry
--
Lawrence Hunter, PhD.
National Library of Medicine
Bldg. 38A, MS-54
Bethesda. MD 20894 USA
tel: +1 (301) 496-9300
fax: +1 (301) 496-0673 
internet: hunter@nlm.nih.gov
encryption: PGP 2.0 public key via "finger hunter@work.nlm.nih.gov"
Newsgroups: rec.audio
Subject: Re: Infinity Speakers - Any Comments
From: michael@sunbeam.ksc.nasa.gov (Michael D. Myjak x7-3286)
Date: 10 Nov 92 10:58:51
Organization: NASA, Kennedy Space Center, FL.
In-reply-to: system@hale.cts.com's message of 8 Nov 92 20:36:00 GMTLines: 42


   > In article <1992Nov9.030822.30189@ns1.cc.lehigh.edu> ptb2@ns1.cc.lehigh.edu (
   > >    Has anyone out there had any experience with Infinity Speakers.  I have 
   > >    set and the tweeters are sh*t.  I've blown three in 2 years and Infinity
   > >    gives me the run around with warrenty service....  Has anyone
   > >    else had any trouble with Infinity speakers or their service department.
   > >    And for the rest of you looking for speakers, DO NOT BUY INFINITY!!!!!!

Its too bad that you didn't specify the model. I'm curious. Oh, and I
don't agree with you regarding Infinity.

><   The best killer of tweeters is a crummy amplifier.
><   [...]
><   What were you doing when you blow them up?

I agree whole heartedly with this. My many years of design and repair
experience has taught me this too. In Fact, I can't recall ever coming
across a speaker that was "blown" from raw power. Every one was either
driven into clipping because of lack of power or had some inherent
defect. <side track...  reminds me of Dick Pierce's comment long ago
about plugging a set of Bose 901's into 110v outlet... and listening to
them fart -from outside the house- for 15 minutes!^>

On the low end... I have installed several ERS-800s which are possibly
the cheapest Infinity speakers I have dealt with. The '800s are an
in-wall speaker w/ 8" woofer and the EMIT-K tweeter.  I haven't had a
problem with them yet. I must admit that they are a little weak in the
bottom end... but its nothing that a good subwoofer won't cure.

I generally try and recommend amplifiers that are in the 250wpc class
to my customers. As such, I can say that I have never had a problem
with a blown tweeter, and I have been designing and installing
conference rooms and lately home theaters for many years now.

--
- Michael D. Myjak			
  Senior Technical Specialist, Systems Analyst
  McDonnell Douglas Space Systems Company
  Kennedy Space Center, Fl., 32815
  MYJAK@TITAN.KSC.NASA.GOV

Gravity. It's not just a good idea. Its the LAW!
From: grego@bit.UUCP (Greg Sanguinetti)
Newsgroups: rec.audio
Subject: Re: Pre-amplifiers
Date: 10 Nov 92 17:09:49 GMT
Article-I.D.: bit.472
Reply-To: grego@bit.UUCP (Grego Sanguinetti)
Organization: BIT  Portland, OR

In article <BxGBM2.L3n@ssesco.com> nau@ssesco.com (William Nau) writes:
>
>I've also seen passive preamps that go for $60 (didn't have any kind of
>input switching).  It had a buffered input and level control (up to line

How does a passive preamp have a buffered input stage? Is my connotation
of the term "buffered" too narrow?
I consider passive and buffered to be mutually exclusive terms.

BTW watch out for impedance missmatches using a passive preamp. Their output
impedance can be quite high, and variable with pot settings.

-grego
-- 
---------------------------------------------------------------------------
Grego Sanguinetti, Bipolar Integrated Technology | Water, water everywhere,
grego@bit.uucp or grego%bit%ogi.cse.edu          | but I'd rather drink
or bit!grego@ogi.cse.edu or ...!ogicse!bit!grego | beer.
From: Curt.Miller@launchpad.unc.edu (Curt Miller)
Newsgroups: rec.audio
Subject: Old 4 pin mic connector?
Date: 8 Nov 92 03:30:33 GMT
Organization: University of North Carolina Extended Bulletin Board Service


	I have an old microphone with the old 4 pin screw tight 
type connector.  I was wondering if anyone could tell me the proper
pinouts for making an adaptor to go to XLR and unbalanced 1/4". If 
anyone knows the answer, please mail me, Thanks!

UCSKJM@UCS.UWPLATT.EDU		Kurt Miller
UCSKJM@UWPLATT.EDU	University of Wisconsin Platteville
 


--
   The opinions expressed are not necessarily those of the University of
     North Carolina at Chapel Hill, the Campus Office for Information
        Technology, or the Experimental Bulletin Board Service.
           internet:  laUNChpad.unc.edu or 152.2.22.80
From: grego@bit.UUCP (Greg Sanguinetti)
Newsgroups: rec.audio
Subject: Re: Infinity Speakers - Any Comments
Date: 10 Nov 92 16:43:21 GMT
Article-I.D.: bit.470
Reply-To: grego@bit.UUCP (Greg Sanguinetti)
Organization: BIT  Portland, OR

In article <6786@dove.nist.gov> keys@starchild.ncsl.nist.gov (Lawrence B. Keys) writes:
> relates good experience with ref series 5000, CS-5 and CS-6

>>In article <1992Nov9.030822.30189@ns1.cc.lehigh.edu> ptb2@ns1.cc.lehigh.edu (PETER TALAN BERGEN) writes:
>> relates bad experience with tweeters failing and warrantee problems...

The guitarist for a band I play with has a set on his stereo. I often listen
to them to learn songs. I find them VERY frustrating because their bass
response is SO BAD that I have a real difficult time figuring out what the
bass is doing. I'm sorry but I don't know what model they are. They are
a tower type speaker, about 36" tall. I would NOT recommend them.
-grego
-- 
---------------------------------------------------------------------------
Grego Sanguinetti, Bipolar Integrated Technology | Water, water everywhere,
grego@bit.uucp or grego%bit%ogi.cse.edu          | but I'd rather drink
or bit!grego@ogi.cse.edu or ...!ogicse!bit!grego | beer.