HDTenEightyP/NetNews huggingface dataset:
From: davidric@uxa.cso.uiuc.edu (david ricardo)
Subject: DCC in Radio Shack Flyer!
Organization: University of Illinois at Urbana
Date: Wed, 18 Nov 1992 22:25:53 GMT

Just received my Christmas Radio Shack gift catalog and on the second
page is a DCC deck for $699. With this kind of marketing push behind
it I think DCC has a good shot. Too bad Radio Shack didn't get behind
DATs. Hope the price drops fast on these. It is on Radio Shack's Optimus
brand and the units front panel looks so cheap just like all the other
optimus products.  


-- 

| Ricardo David              RacerX Engineering              |
| University of Illinois          ...keep them mowing        |
| davidric@uxa.cso.uiuc.edu                 blades sharp ... |
Newsgroups: rec.audio
Subject: Re: Why filter D/A output?
From: st_waldman@fencer.cis.dsto.gov.au
Date: 20 Nov 92 08:08:06 +1100
Organization: D.S.T.O. Aeronautical Research Laboratory

> You have a good point regarding filtering ... The best that I can come up with in
> terms of explaning why filtering is needed is that the distortion products at
> higher frequencies have images that 'fold' back into the audio band. Therefore
> filtering is required to suppress noise in the audio band.

When an output signal is generated by a DAC, it looks more like a
stair-case type of signal. eg. for a sine wave we might get:

            --        --        --
           -  -      -  -      -  -
          -    -    -    -    -    -
         -      -  -      -  -      -
        -        --        --        -

Just imagine that each of the steps (line segments) is joined to the previous
one by a continuous line. These steps are contain high frequency components
that are a higher frequencies than that of the sine wave signal that
we are trying to represent. Remember, a square wave signal will be composed of
a sine wave at the fundamental frequency, plus a whole set of odd-order
harmonics.

In our "digital" representation of the sine wave, the steps coming out of
the DAC will also contain higher frequency harmonics, where the unwanted
signal frequency components are greater than 1/2 the sampling rate (I think).
These frequencies must be removed by filtering, and hence the filtering
process will smooth the stepped waveform that I have drawn above.

Hope this provides some help...

Witold Waldman
witold@hotblk.aed.dsto.gov.au
From: lstowell@pyrnova.mis.pyramid.com (Lon Stowell)
Newsgroups: rec.audio
Subject: Re: INFO WANTED: CD's and the degeneration thereof?
Keywords: CD, laser
Date: 17 Nov 92 01:17:29 GMT
Reply-To: lstowell@pyrnova.pyramid.com (Lon Stowell)
Organization: Pyramid Technology Corp., Mountain View, CA

In article <9220410.51@sunvax.sun.ac.za> 9220410@sunvax.sun.ac.za (Walter Prins) writes:
>Hi.
>
>Would some of you Audio Wizards with knowledge regarding this please help  me
>out here.  I remember reading an article (Popualar Science, I *think*) quite 
>a while back regarding CD's and the degeneration of them when not played for 
>long periods of time. 
   
      More like "UNpopular Science".

>If I remember correctly, it has something to do with 
>the type of plastic used in CD's. Also apparently this effect can be negated 
>by playing your CD's occasionaly. The type of laser used apparently also 
>makes a difference. (Something to do with the light frequency.)
>
     You should use a green laser?  Seriously, the wavelength of a
     CD player better be pretty close to the norm, or it might have
     trouble reading data.
     
     CD's use polycarbonate plastic mostly.  It's pretty tough
     stuff.  However, most CD's are made with only a thin lacquer
     coating on the information reflective layer.  The label is
     printed on this thin protective coating.  SOME label inks would
     crud up the lacquer and damage the reflective layer.

     If you damage the reflective layer, no laser is gonna correct
     it unless it generates LOTSA power.  If you have corrosive inks
     or other problems in the thin protective coatings, the flea
     power of the playback laser isn't gonna do a thing.

>I've got a friend who's quite an audio fanatic and he wants to know if this
>is true/false etc.  Any and all info regarding this will be most appreciated.
    If they are the typical no-science type of fanatic, save your
    breath.  
Organization: Doctoral student, Engineering and Public Policy, Carnegie Mellon, Pittsburgh, PA
Newsgroups: rec.audio
Date: Fri, 20 Nov 1992 11:21:05 -0500 
From: Luis Abdon Cifuentes <lc0v+@andrew.cmu.edu>
Subject: JVC RX707 vs NAD


I am considering getting a surround receiver. I have seen the JVC 707,
and it seems ok: 100wpc + 50 center + 20 rear.  
I currently have a NAD 7175. Very simple and powerful.

The question is: are the JVCs any good? They have a lot of features, but
will they sound good and last as the NAD?

Any users of JVC out there?
From: winalski@adserv.enet.dec.com (Paul S. Winalski)
Newsgroups: rec.audio
Subject: Re: Defeating SCMS
Date: 19 Nov 92 18:25:05 GMT
Reply-To: winalski@adserv.enet.dec.com (Paul S. Winalski)
Organization: Digital Equipment Corporation, Nashua NH


In article <1eej0gINN1i4@hpscdf.scd.hp.com>,
rkarlqu@scd.hp.com (Richard Karlquist) writes:
|>
|>2.  Anyone (especially non-Japanese companies) who tries to compete with
|>DAT/DCC gets snarled up in government red tape.

DCC is being pushed by Philips, which is a Dutch company, not Japanese.

|>Remember that the same
|>companies who make DAT also own record companies (Sony=CBS, etc.).

Sony is the only DAT manufacturer that I know of that owns a record company.
The main reason why they bought Columbia Records was to stop Columbia from
getting in the way of selling and marketing DAT in the US.  Columbia was in the
forefront of the notch filter and the blockade of DAT technology.

The point being that the DAT manufacturers are not in bed with the recording
industry on this issue.  If they had their way, there would be no DAT tax and
no SCMS requirement.  But the recording industry lobby is powerful enough to
sink DAT, so the manufacturers cut the best deal that they could.

--PSW
From: bobschulien@cup.portal.com (Robert John Schulien)
Newsgroups: rec.audio
Subject: Re: How do you know when you've killed your tweeters?
Date: Fri, 20 Nov 92 22:13:43 PST
Organization: The Portal System (TM)

Patricia A White writes:
> 16161.3.9834.1 How do you know when you've killed your tweeters?
From the looks of your site I'd say you do like to listen to ear-bleeding
sound levels, no?  Simple test could be to swing the balance back and forth
and see if there is a difference.  If both are blown, well, you know.  If
your B&W speakers have cone tweeters (I don't know), they might make
grinding, raspy sound as the voice coil scrapes the housing inside the
speaker itself.  Dome type speakers might do the same.  Planar speakers
are easy -- look for burnt metal 'peeling off the walls.'  If you do
find one speaker acting strange, make sure you switch left and right
channels from the amp and see if the problem goes to the other speaker.
I've got a weak left channel on my amp that was easily diagnosed this
way.  On a humorous note, I had a cousin who for fun (must not have
had anything better to do) would hook up small television speakers he
had removed from junked TVs to his monster amp.  After the volume was
turned up all the way, he would rub the stylus with his finger.  A voice
coil would instantaniously be bouncing around the room.  Great fun!
Bob Schulien       bobschulien@cup.portal.com
From: randyd@csd4.csd.uwm.edu (Randall Elton Ding)
Newsgroups: rec.audio
Subject: Re: Recommendations needed for $500 CD player
Date: 20 Nov 1992 00:02:40 GMT
Organization: Computing Services Division, University of Wisconsin - Milwaukee
NNTP-Posting-Host: 129.89.7.4
Keywords: cd player

In article <1992Nov19.204448.6483@bmerh85.bnr.ca> stud1b53@bnr.ca writes:
>In article <1992Nov18.231429.6873@newsgate.sps.mot.com>, chiu@gpb-mac. (Norman Chiu) writes:
>|>     I want to upgrade my CD player, (after all, it is almost Christmas!!)
>|> and I want all the opinions please.
>|>

  I use an Adcom CD player.  It cost just about $500 a year ago.  However
  I paid nearly $100 extra to get the white front panel option.  I have a
  completely white system (It looks ~HOT~).

  This CD player uses dual 16 bit with 4x oversampling if you like to
  compare that sort of stuff.  One thing I noticed is that this CD player
  reproduces sub-sonic frequencies better than other CD players I have
  hooked up to my system.  You see, I have two 6.5 cu ft subwoofer towers
  with 15" woofers and you can really feel the difference on certain
  types of music.

  Just a note about a Carver CD player by buddy brought over one day.
  At first we didn't know what was going on but later discovered if I
  used my Adcom remote control while the Carver CD player was operating,
  the Carver would go into an un-recoverable crash!  The CD dropped down
  onto the changer while it was still spinning and would not respond to any
  front panel controls until the unit was powered down then turned back on.

  My buddy called up the Carver company and they said the Adcom remote
  was at fault.   You be the judge.

Newsgroups: rec.audio
From: SCN146@waccvm.corp.mot.com (Bruce Given)
Subject: Minidisc
Organization: Motorola
Date: 17 Nov 1992 06:40:59 MST

latest issue of stero review Has DCC all over the front cover interesting
that sony has a 8 page Advert for Minidisc...
Is it avaliable yet ??? does anybody know
thanks
Bruce             standard disclamier : My views Not Motorolas
Newsgroups: rec.audio
From: gvh@metrosoft.com (Gordon Van Huizen)
Subject: Re: DCC -- JUST SAY NO!  (was: The end of cassettes,
Reply-To: gvh@metrosoft.com (Gordon Van Huizen)
Organization: Metrosoft
Date: Wed, 18 Nov 1992 20:27:26 GMT

In article <27628@oasys.dt.navy.mil> curt@oasys.dt.navy.mil (Curt Welch)  
writes:
> I just got done reading the review of the Philips DCC900 DCC deck in
> this month's Stereo Review (everyone interested in DCC and MD should
> pick up a copy of this).  The reviewer concludes: "...anyone who
> expects to find that perceptual coding is hokum, or that their ears
> transcend the physiological constraints upon which it is based, will be
> shocked by the very high-fidelity sound DCC actually delivers.  There
> is absolutely no question that it rivals CD sound quality."
> 
Don't forget that these are the same people that have claimed that CD players  
all sound the same. "Very high-fidelity" is an interesting term from a magazine  
that mostly reviews mid-fi components.

> And, I expect that it's much better than cassette, and
> only slightly worse than DAT.
> 
Time will tell. I have different expectations.

> I think that people who want the highest quality should go for DAT/CD
> and if you want features, you should go for MD.  I just don't see how
> DCC can survive.
> 
Marketing, politics and perception.

-- 
----------------------------------------------------------------
Gordon Van Huizen           vox: 619.488.9411  fax: 619.488.3045
Metrosoft                   gvh@metrosoft.com [NeXTmail welcome]
----------------------------------------------------------------
Newsgroups: rec.audio
From: gribble@bronze.ucs.indiana.edu (steve gribble)
Subject: Sub-woofer recommendations
Organization: Indiana University
Date: Mon, 23 Nov 1992 19:11:49 GMT

I'm interested in sub-woofers--i'd like to hear
recommedations, warnings, etc.  price range <$500.

thanks,
steve gribble
From: kmr4@po.CWRU.edu (Keith M. Ryan)
Newsgroups: rec.audio
Subject: Re: DCC -- JUST SAY NO!  (was: The end of cassettes,
Date: Wed, 18 Nov 1992 13:30:25 GMT
Organization: Case Western Reserve University
NNTP-Posting-Host: b64746.student.cwru.edu

In article <1992Nov18.044130.19040@dgbt.doc.ca> ted@dgbt.doc.ca (Ted Grusec) writes:
>As head of one of the labs that did the CCIR Study Group 10 tandeming
>tests, and as one of the principal authors of the reports, let me
>assure you there is progressive loss with tandeming (i.e. with multiple
>passes through lossy psychacoustic algorithms)

	Would it not be possible to have a digital record in port, which 
bypasses this compression circuit? After all, why can't one DCC record the 
exact "bitmap" of the other, as a floppy can copy directly off of the hard 
drive of a computer. While one can argue if this method of bit copying can 
lead to degradation, I think it'll be far less than running it through the 
compression circuitry every time.
From: jeh@cmkrnl.com
Newsgroups: rec.audio
Subject: Re: Need help on buying Bookshelf Speakers
Date: 17 Nov 92 18:27:51 GMT
Organization: Kernel Mode Consulting, San Diego, CA

In article <1e4cmfINNnc7@agate.berkeley.edu>, jkonghsu@ocf.berkeley.edu 
(James Kong Hsu) writes:
> 
> 	I am looking for a good pair of bookshelf speakers for
> 	the price range of $100-150 each. I have a Sony 120 watt
> 	amp and I need the speakers to be able to handle this power.
> 	If you have any suggestions please mail me at:

In the July '92 issue of _Stereophile_ is a review of the "PSB Alpha" 
speakers.  $200 per pair.  These speakers were several of their writers'
"Best Buy of the Show" at their recent high-end audio show in LA.  

It says here that PSB is at 800-263-4641; you can call them to find out who
carries these near you. 

They also mention that in the past (Volume 13 No. 1) they've given good marks
to another price leader, the Dana Audio Model 1 (also at $200).  

It might be worth it to go hunt up these reviews.

	--- Jamie Hanrahan, Kernel Mode Consulting, San Diego CA
Internet:  jeh@cmkrnl.com, hanrahan@eisner.decus.org, or jeh@crash.cts.com
Uucp:  ...{crash,eisner,uunet}!cmkrnl!jeh
Newsgroups: rec.audio,rec.video
From: formula@athena.mit.edu (Ronald R. Duff Jr.)
Subject: Need phone number of Memorex
Organization: Massachusetts Institute of Technology
Distribution: na
Date: Mon, 23 Nov 1992 18:22:43 GMT

	Could someone send me the address for Memorex (not Memorex-Telex!)
that makes the audio tapes, etc.?  I'm interested in buying either their
CP4, CP6, or CP8 remote controls and I need to know who sells them in my
area.  I cannot determine their number (preferably toll-free!) from either
directory assistance or the Thomas Register so I thought I'd post the
request here.  Thanks!

				Ron
--
Address: Ronald R. Duff Jr.         Phone: (508)842-2293 (Home)
         29 Lamplighter Drive              (617)253-1652 (Work)(MIT room 6-332)
         Shrewsbury, MA 01545    Internet: formula@athena.mit.edu
From: andyt@intermec.com (Andy Tiura x1807)
Newsgroups: rec.audio
Subject: Re: A $2700 public audio system for a church???
Date: 19 Nov 92 00:08:15 GMT
Reply-To: andyt@intermec.com (Andy Tiura x1807)
Distribution: usa
Organization: Intermec Corporation, Everett WA

I would suggest that you locate a qualified consultant who will survey your
space and your application and design a "turnkey" system which is idiot-proof.

By way of example:  my church has a professionally designed & installed sound-
reinforcement system in the main sanctuary.  It has only one function:  increase
the intelligibility of  the spoken word throughout a ~600 person capacity room.
The (literally) clueless users of the system just replace some wireless mic
batteries every couple weeks and turn a key switch at the start of each 
service.  It is equalized and levelled so that it is completely unobtrusive 
in operation..... feedback doesn't happen.... and the dang thing was over
$8,000 in 1983!  The only time you are aware of its existence is when someone
forgets to turn it on.

The other sound system in use is a portable Radio-Shack unit which, while
outwardly simple in appearance, is set up by average parishioners for occasion-
al functions in several rooms with uniformly disastrous effects.  Every avail-
able knob will be tweeked randomly throughout the event in an ongoing effort
to tame the feedback while still being heard in the back of the room.  But 
no one seems to think that the $400 invested in this beast was a waste......

Get some experienced advise and purchase reliable equipment.  It is much
simpler in the long run.


Newsgroups: rec.audio
From: bosco@leland.Stanford.EDU (Eric Bosco)
Subject: Need help on choosing < $700 speakers
Organization: DSG, Stanford University, CA 94305, USA
Date: Mon, 23 Nov 92 01:22:44 GMT

Well, as the title says, I'm looking for speakers in the $ 600 - $700 
range.  The type of music that I listen to is mostly rock such as
Pink Floyd, Dire Straits, Supertramp etc. I also enjoy blues and soul very
much and I'm trying to get to know that type of music better.  Also, since
these speakers are going to be an integral part of my living room, which 
consists of mostly modern furniture, I'm looking for floor standing, black
speakers.  I guess smaller speakers with stands would be OK, but I definitely
don't want oak or wood grain speakers (my fiancee would kill me :-) ).

Anyhow, up to now I've listened to the following:

Boston Acoustics t930
DCM TF600
MB Quart Three's
Infinity Reference 5
NHT 1.8
Celestion 15

Unfortunately, all of these were in different audio stores and show rooms,
so I couldn't AB any of them. I liked the NHT's a lot. I was surprised that
they had such powerful bass.  However all the other ones sounded good too.
The DCM's had a very pleasing overall sound, the Boston Acoustics seemed 
very smooth.  I wasn't too impressed wit the Infinity's though.

Any comments? Any other brands I should look into? Right now, as it stands,
I would by the NHT's. Are they  good speakers? Please let me know, and I'll
post the answers if there is demand for it.

-Thanks,

Eric

bosco@cs.stanford.edu

Newsgroups: rec.audio
From: bower@pecan.cns.udel.edu (Tyson Bower)
Subject: Re: Problems with my system ...
Organization: University of Delaware, Newark
Date: Thu, 19 Nov 1992 20:54:13 GMT

Naturally, I'll assume you have all loudness contour switches on your
pre-amp turned off.

Pull your speakers farther away from the walls.  If the tweeters aren't
already at ear level, get them up on stands.  Your room may also be too
"soft."  Lots of couchs, plush rugs, drapes, etc tend to absorb the
higher frequency.  If two of the dimensions in the room are equal
(ie., a 14' by 14' square room) you can get some nasty standing waves.

So, what I'm saying is mostly what you've said yourself.  The AR's
"sounded good in the store."  Well, what sounds good in the store
may not sound the same at home.  You need to play with the arrangement
a bit.  Location plays a crucial factor in determining imaging and
low-frequency reponse.  In your case, you've got too much of the latter
and none of the former.  AR's are noted as being the pioneers in 
wide-dispersion speakers that are supposed to sound good in normal 
living conditions, not just in anechoic chambers, so I'll assume your
speakers are of decent quality.

Tell us more about your room and the placement of things.  BTW, how
old are your AR's?  Did you get them new?  Are the tweeters functioning?

Organization: Sophomore, Electrical and Computer Engineering, Carnegie Mellon, Pittsburgh, PA
Newsgroups: rec.audio
Date: Mon, 23 Nov 1992 22:04:51 -0500 
From: Bambang Suryanto <bs3f+@andrew.cmu.edu>
Subject: Re: Bose 4.2

>So, did I get a deal?  Does anyone consider these the basis
>for a long relationship, or will I be relegating them to
>stereo-surround duty in just a few years? (They aren't big;
>they'd fit on a bookshelf but take about three feet of it.)

For a long term? No way, Bose 4.2 is really boomy, they are not clear
and detail and their imaging sucks!
_______________________________________________________________________________
_
"I was line up for glory, but the ticket sold out in advance"  - N.Peart
"We will pay the price but we will not count the cost"  -N.Peart
Newsgroups: rec.audio
From: gvh@metrosoft.com (Gordon Van Huizen)
Subject: Re: DCC -- JUST SAY NO!  (was: The end of cassettes,
Reply-To: gvh@metrosoft.com (Gordon Van Huizen)
Organization: Metrosoft
Date: Sun, 22 Nov 1992 20:37:57 GMT

In article <1992Nov20.210258.6891@e2big.mko.dec.com> owen@emds.enet.dec.com  
(Steve Owen) writes:
> 
> And don't forget amps... all amps sound the same too.  And
> CD's are perfect sound... there can not be any better. 
> 8^) 
> 
> 

I was going to mention amps (in fact I'd typed it, then backspaced over it),  
but I didn't want to push the issue... :-)

Gordon
-- 
----------------------------------------------------------------
Gordon Van Huizen           vox: 619.488.9411  fax: 619.488.3045
Metrosoft                   gvh@metrosoft.com [NeXTmail welcome]
----------------------------------------------------------------
Newsgroups: rec.audio
From: pcw@flutter.tv.tek.com (Patrick C. Wilkins)
Subject: Re: Headphones - Sony/Sennheiser?
Organization: Tektronix TV Products
Distribution: usa
Date: 17 Nov 92 17:41:50

Buy the Sony 7506, formerly the MDR-V6. $79
I like Sennheiser headphones but the better ones are justs too expensive. 
--

-------------------------------------------------------------------
    Pat Wilkins II
    A.K.A. Clif
    Email pcw@flutter.tv.tek.com
    Work 503-627-6525

-------------------------------------------------------------------
    Is Deja-vu real or is life just redundant???????
-------------------------------------------------------------------


Newsgroups: rec.audio
From: palane@iastate.edu (Paul A. Lane)
Subject: Re: Digital Amps -> next???
Organization: Iowa State University, Ames IA
Date: Thu, 19 Nov 1992 23:30:58 GMT

In <4310@cvbnetPrime.COM> dhukill@esprit.prime.com (Dave Hukill x4056 5-1) writes:

>Now that we have CD, MD, DCC, DAT, and even Laser Disc players with digital
>outputs, and pre-amps that will accept and convert them to analog, the
>next logical step is digital amps, and obviously, speakers. Is this type
>of technology possible? Does it even exist? Assuming these are true, what
>advanatages/disadvantages would this provide? I think a discussion on this
>subject would be both interesting and educational.


>Dave Hukill <dhukill@esprit.prime.com>

Umm. I'm not so sure on this one. Digital preamps for DAT and CD make a lot
of sense as the switching, volume control, balance, and special effects
can all be done in the digital domain. However, one must make the switch-
over to analog at some point as music is an analog phenomonon. Digital
circuitry is designed to operate a moderate voltage low currents. However,
transistors and ICs for power amplification operate at high currents and
power dissipation (sp?). I'm not sure that I see any benefits to a digital
amp as I would think that DA conversion has to occur before current
amplification. Any takers?

Paul
From: grego@bit.UUCP (Greg Sanguinetti)
Newsgroups: rec.audio
Subject: Re: Cable Design Proposal
Date: 18 Nov 92 16:29:21 GMT
Article-I.D.: bit.492
Reply-To: grego@bit.UUCP (Grego Sanguinetti)
Organization: BIT  Portland, OR

In article <19328@ucdavis.ucdavis.edu> matthews@eecs.ucdavis.edu (Thomas W. Matthews) writes:

 a wonderfully humorous and detailed post about why reflections on audio
 interconnects are irrelevent deleted to save bandwidth....

>I thought I'd post this to show how I'd approach the question, given
>my engineering training.  However, I recognize that I may have
>overlooked something, or even be completely wrong.  Given that
>many readers think reflections are important, and my analysis
>leads me to believe that they're not, I'm interested in reading
>and learning from any discussion which follows.
>
>Tom Matthews

Bravo Tom, nice post. I had dismissed the original idea as a clever but
unneeded solution to a non problem. You on the other hand clearly identified
the humor potential. I won't double check you math because it really doesn't
matter. Very subtle summary too. Great stuff, I'm now starting the day
out with a smile, thanks.  -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.
Newsgroups: rec.audio