HDTenEightyP/NetNews huggingface dataset:
From: stuartw@ccu1.aukuni.ac.nz (Stuart Woolford)
Newsgroups: rec.audio
Subject: Re: 20 or 24 bit digital recording?
Date: 23 Jul 92 00:04:20 GMT
Article-I.D.: ccu1.1992Jul23.000420.15157
Organization: University of Auckland, New Zealand.

wgd@ukc.ac.uk (W.G.Day) writes:

>>Would increasing the resolution of CD increase its transparency?

>As it is unlikely that complete sonic transparency is just related to
>resolution, I suspect the answer to your questio is no.  Increasing
>resolution will give more detail though.

>Current vinyl is apparently about twice the resolution of CD (assuming
>you've got a clean record, but we've talked about that).  If you did
>increase the CD's resolution you need to invent a new completely format
>basically.  Even though you are only changing the 16 bits to 24 bits you
>need to increase the size of your CD or have only a 55 minute limit.  Also
>you need to completely change your error correction software.  Increasing
>your resolution just gives you more detail.  However every so often people
>come up with new plastics which can form more complex shapes and these can
>be used to press records without changing your turntable.

twice the resolution of CD??? no..not even close....

>>This might sound like a dumb question, but since the so-called 1 bit
>>players get the data off a disk as a constant stream of data, would
>>they be able to benifit immediately from this change in recording?,
>>or would it be necessary to change the player to full 20 or 24 bit 

>The 1 bit players get the data off in the 32 byte packets just like
>multi-bit players do.  Data off a CD is data off a CD.  The 1-bit

yes.

>players however use the 1 bit (delta sigma) system to reconstruct
>the sound without having large errors in the resistors that multi-bits
>can have.

no.

>16384 ohms +/- 5% is about 800 ohms error.  In a multi-bit player there
>are also resistors of 1 ohm, 2 ohm, ... , 256 ohm , 512 ohm , 1024 ohm.
>So the errors really corrupt the sound produced.

so, you actually think that they use 5% resistors in the DAC ???
no...more like 0.001% ( which I can even purchase in 5Watt discrete components
let alone on-chip film resistors! )
and you actually know the resistor values in a DAC???, interesting...

>>thanks.

>>#   T8800568@phillip.edu.au       #  in the sweetest bud.               # 

>Warren

-----------------------------------------------------------------------------
stuartw@ccu1.aukuni.ac.nz


			>>>>In VI Where Available<<<<
-----------------------------------------------------------------------------
From: ds10760@medtronic.COM (David Suess)
Newsgroups: rec.audio
Subject: Op-amp upgrade for Denon 620
Keywords: op-amp,denon
Date: 22 Jul 92 17:40:22 GMT
Reply-To: ds10760@medtronic.COM
Organization: Medtronic, Inc.

With all the news lately regarding upgrading op-amps in low and mid-fi
CD players, I though I'd jump on the bandwagon.

I have a DENON DCD-620 unit, but I'm not sure if the op-amps used in
the analog output stage are equivalent to the "standard" upgrade
op-amps (AD712/AD827) people are so excited about.  Rather than just put
something in and fry it, I would like to determine what is currently
in my unit.  The 8-pin DIL op-amps in the analog stage have the numbers
"BA15218" and "932 279A" onn them.  I have not been able to cross
reference them to anything.  Does anyone have a clue?  Will the AD712
or AD827 be a "plug and play" replacement?  If not, what would a
suitable upgrade chip be?

BTW, all I'm interested in doing is upgrading the unit so that it does
not sound "too objectionable" so that I can listen to it.  I am a
dedicated user of "tubes and LPs", but I recognize that some of the
music I want is only available on CD, although I continue to search the
used LP stores.

Any help would be appreciated.
Newsgroups: rec.audio
From: strong@tc.fluke.COM (Norm Strong)
Subject: Re: Advice on KENWOOD Receivers
Organization: John Fluke Mfg. Co., Inc., Everett, WA
Distribution: usa
Date: Thu, 30 Jul 1992 14:00:13 GMT

In article <1992Jul24.165450.13782@babbage.ece.uc.edu> psinha@cabbage.ece.uc.edu (Praveen Sinha) writes:
}I had requested information/advice on choosing a receiver earlier also. I
}haven't seen much reviews about Kenwood receivers and hence would appreciate
}if someone could post it on the net. I was going through the features of
}KR-V7040, KR-V8040, KR-V8540 and KR-V9030 in a catalog (I think Crutchfield.)
}and their quotes.(which seemed a bit higher then other mail order places).
}
}In the March issue of Consumer Reports, KR-V7030 was rated as a best buy. How
}reliable are Consumer Reports anyway ? That particular issue also rated 
}Onkyo's TX-906 as a good buy in the Dolby Surround category. TX-906 
}isn't a powered Pro-logic receiver although it has the required circuitry.

Here's where I get myself in trouble. :-)

CU is as reliable as any blind report can be, i.e. without knowing
what your specific needs are.  If the Kenwood has the features you need,
and is not burdened with features that are useless to you--and this is
something you'll have to figure out yourself--then it may very well be a
BEST BUY.  

Crutchfield prices are indeed somewhat higher than others.  However,
the Crutchfield price includes shipping.  If you're buying a pair of
loudspeakers, and live on the West Coast, this may make a considerable
improvement in the final delivered price.

-- 

Norm Strong  (strong@tc.fluke.com)
2528 31st S.   Seattle WA 98144   USA
From: monta@image.mit.edu (Peter Monta)
Subject: Re: Compressed audio better than noncompressed?
Organization: MIT Advanced Television Research Program
	<1992Jul24.074842.15614@lugb.latrobe.edu.au> <22742@oasys.dt.navy.mil>
Date: Fri, 24 Jul 1992 17:19:20 GMT

In article <22742@oasys.dt.navy.mil> curt@oasys.dt.navy.mil (Curt Welch) writes:

> My guess is that you can probably do something like 8:1 loss free
> compression on CD's but designing and building the hardware to do this
> in real time is currently too expensive.

If you really mean "loss free", i.e., the original 16-bit data is
reproduced, then this is impossible.  Any audio recording on CD has
an entropy larger than 2 bits/sample.

> ... As I understand it, both the DCC and MD compression algorithms
> eliminate some sounds based on the human ears ability to here them
> because of masking effects.
> ...
> So, I'm just wondering when people will start claiming that
> compressed audio sounds better than non-compressed becauses
> it has been purified?

Enhancement isn't the goal of these algorithms; they attempt to
minimize the loudness of quantization noise, so to the extent that
the compressed audio is indistinguishable from the non-compressed,
these algorithms are good.  Enhancement/restoration is an interesting
topic, but it's separate from source coding.

Peter Monta   monta@image.mit.edu
MIT Advanced Television Research Program
Newsgroups: rec.audio
From: phc65823@uxa.cso.uiuc.edu (Peter H. Chou)
Subject: how to fix noisy CD motor
Organization: University of Illinois at Urbana
Date: Sat, 25 Jul 1992 18:00:34 GMT


Hi, my CD player has a noisy motor or something--it makes a humming
noise or something whenever it does any sort of seek or anything,
and when I load and unload the CD (I guess the head is "parking"
or something like that).  Is there anything I could do about that?
Also, my tape player squeaks--when it's playing, I hear a recurring
squeak every second or so.

oh I have another question (all my stuff is messed up!):
I have an Aiwa walkman, and for some reason sometimes, the auto-reverse
thing will kick in in the middle of tape--I guess it thinks it's
at the end of a tape or something, and it reverses the direction
right in the middle of a play.  What's going on here?

Thanks for any help about this stuff!
From: motoyama@harl.hitachi (Hiroshi Motoyama)
Newsgroups: rec.audio
Subject: Re: Old tube radio
Date: 24 Jul 92 01:34:29 GMT
	<27110025@hpspkla.spk.hp.com>
Organization: Advanced Research Laboratory, Hitachi, Ltd
In-reply-to: borowski@hpspkla.spk.hp.com's message of 21 Jul 92 22:16:22 GMT

In article <27110025@hpspkla.spk.hp.com> borowski@hpspkla.spk.hp.com (Don T. Borowski) writes:

   >remember correctly).  It was describing the new tubes of the era.  They
   >talked about the 6SJ7 replacing the 6J7, the 6SK7 replacing the 6K7, etc.
   >The "S" means single ended, that is, all the connections at one end of the
   >tube (no anode caps).

In this case, (no grid caps) is correct.
--
Hiroshi Motoyama                   e-mail:  motoyma@harl.hitachi.co.jp
Advanced Research Laboratory       tel:       0492-96-6072 ext. 6233   
Hitachi Ltd.                                    
Hatoyamamachi, Saitama, Japan
Newsgroups: rec.audio
From: dkf8117@tamsun.tamu.edu (D. K. Fields)
Subject: Sony Updates/Modifies 1070
Organization: Texas A&M University, College Station
Date: Tue, 28 Jul 1992 19:38:00 GMT

For those of us with Sony 1070's, there is an update available that is
supposed to correct some problems with rear/center hiss, and heat build
up.  I'm waiting on mine to come back from the shop now, so will fill you
in with what I get.

Duane


-- 
Duane Fields                  Friends don't      Work#   (409) 845-6904
Box 1315                     let friends use     Home#   (409) 847-6760
College Station, Tx 77841        MS-DOS.         dkf8117@tamsun.tamu.edu
From: colby@tsd.arlut.utexas.edu (Colby Leider)
Newsgroups: rec.audio
Subject: Cambridge SoundWorks?
Date: 27 Jul 92 15:03:54 GMT
Distribution: usa
Organization: Applied Research Laboratories, University of Texas at Austin


Does anybody know anything or have any input regarding Cambridge SoundWorks?
I'm looking at Ensemble II in particular.


Thanks.
Colby Leider
colby@titan.tsd.arlut.utexas.edu
Newsgroups: rec.audio
From: ianchan@leland.Stanford.EDU (Ian Hin Yun Chan)
Subject: Re: Digital Coax, 1.5m, b/w cd & dat, <=$200: suggestions?
Organization: DSG, Stanford University, CA 94305, USA
Distribution: na
Date: Wed, 22 Jul 92 23:33:59 GMT

I don't know why good digital interconnects should sound different, especially
if they're all optimized to carry RF signals (eg 75ohm TV types). For sure we
don't hear of computers boasting of being wired up with $$$ cables! But the
fact of the matter is, I DO hear differences! Audio Alchemy has its own
digital interconnect that`s supposed to be really good, which links their
transport to their DDE. And it IS good, but the MASterlink Black is even
better! Some detail is lost in the AA cable is all I know.
What follows now is IMHO only:
All electrical devices and circuits in a system are inevitably connected
together and therefore have influences on one another. Now, as long as
EVERYTHING is digital, the signal can get pretty mucked up and still be totally
acceptable to other compinents (that is, after all, the advantage of digital).
But once you stick in a device which outputs ANALOG, then the non-ideal digital
signals will show up. Consider the following:

-----(MSB)----1k----|
--------------2k----|
--------------4k----|
	:	    |
	:	    |
	:	    |
-----(LSB)---3200k--|
		    |
		 output (summed)

This is a crude DAC, but will illustrate my point - if 'dirty' bits are sent
to the inputs of this DAC, then the ouput will also be dirty, even though the
digital bits are recognizable to any digital equipment. So instead of getting a
well-defined pulse of, say, 45435 units high, the ouput will fluctuate about
that value. You may argue that these fluctuations are less than the width of
the pulse, so are inaudible, but the thing is, if the noise is random, then the
average value of the output is NOT always 45435, but will be a gaussian
distribution about that value. That is, you may be getting 45500 instaed, or
45300. But if the noise is low (ie, the signals look square), then the variance
of the distribution will be small, and the probability will be larger that
45435 will in fact be your output. All you can do is tidy up the digital signal
so that the waves are more like the rectangular waves they're supposed to be,
It is impossible of course to produce perfect digital signals (infinite
bandwidth needed), but we can try our best to reduce the gunk and/or phase
shifts that will distort it, so that the DAC can see the best possible signal.
It is true that a good DAC will not sound too different when different wires
are used because it should tidy the signal pretty well, but if the signal was
quite clean to begin with, wouldn't it be even cleaner after that? A good
digital interconnect will always be better (note I didn't say expensive), and
from my experience, the MASterlink Black is GOOD!
Half-baked digital signals are fine for all digital equipment, but not when
it's converted! Just my $.02.

- Ian
From: myers@hpfcso.FC.HP.COM (Bob Myers)
Date: Thu, 23 Jul 1992 23:31:56 GMT
Subject: Re: Metal Capacitor
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: rec.audio

 > 'Disc' is the generic term for ceramic.  They are useful in non-critical
> applications such as decoupling.  They come in a wide variety of voltage and
> capacity ratings.  You will find designations such as Z5U and NPO on ceramics
> to specify the thermal coefficient of capacity.  In some high or low temperatureapplications this is an important consideration.  It is however of little
> use to the audio community.  Ceramics also display a very low ESR.  In 
> 

The comment about Z5U vs. NPO is not exactly correct; yes, these ARE 
indications of temperature dependence, but they may be a concern in
audio (and other applications), as "Z5U" material is typically of low
quality (more voids, etc.).  Use X7R at least, and NPO if at all possible.


Bob Myers  KC0EW   Hewlett-Packard Co.      |Opinions expressed here are not
                   User Interface Tech. Div.|those of my employer or any other
myers@fc.hp.com    Fort Collins, Colorado   |sentient life-form on this planet.
From: bbb1s@kelvin.seas.Virginia.EDU (Bibhuti Bhusan Banerjee)
Subject: Sony CD Player tray won't even stay in!
Organization: University of Virginia
Distribution: usa
Date: Fri, 24 Jul 1992 19:40:26 GMT


Hi net-experts,

My 3-year-old player has just started acting up in a strange way.
For quite some time, I used to have to nudge the tray outward to
have it come out and accept a disc, even after pressing the eject
button. The other day, the CD it was playing started to sound weird,
as if it was a vinyl record being played at a gradually decreasing
speed. I decided to take it out and try another CD. The tray would
not even go in, irrespective of the presence or absence of a CD.
Actually, when I pressed play after the tray went in momentarily,
the tray came out again. It wouldn't stay in!

I am wondering if this is something that can be resolved without
recourse to a Sony repair shop. I am an engineering graduate
student with reasonable access to mechanical and electrical tools.
Your comments would be greatly appreciated. Please send me
e-mail, and I will summarize if there is a lot of interest. If
this situation has already been discussed in an FAQ list, please
forward it to me, since I do not normally subscribe to this newsgroup.
Thanks a lot in advance for all suggestions.

Bibhuti Banerjee
bbb1s@virginia.edu

Newsgroups: rec.audio
From: lmazur@pucc.bitnet (Leszek Mazur)
Subject: Dolby Pro-Logic question
Followup-To: rec.audio
Originator: news@ernie.Princeton.EDU
Organization: Princeton University
Date: Tue, 28 Jul 1992 20:38:41 GMT

Hello Everyone,

I have a Technics 505 receiver.  When I listen to it in Dolby Pro-Logic
mode,
I've noticed that the center channel is out of phase with the main front
channels.  Is it normal for the center channel to be out of phase with the
front channels, or is it a design bug?

Please E-Mail the responces to me.

Thank You to all that will respond.
Newsgroups: rec.audio
From: desmondw@merrimack.edu
Newsgroups: rec.audio
Subject: Stereo Reviews advertisers
Date: 27 Jul 92 09:57:30 GMT
Organization: Merrimack College, No. Andover, MA, USA


     I'm glad discussions on these mail order places are popping up.
I'm interested in some stuff from a place called 6th ave Electronics
City(page 81 in Aug issue of Stereo Review). Look at their prices!
It can't be perfectly new equipment. I was interested in buying a 
pair of Boston Accoustics speakers. I can't find them for under
$900/pair anywhere, YET this place says the same speaker model is
$396/pair.? I'm a little skeptical.
     I'd be more apt to buy speakers than amps since amps can have
a million problems. I wonder if this stuff isn't factory serviced.
Newsgroups: rec.audio
From: epog6796@uxa.cso.uiuc.edu (Eric Peter Olson)
Subject: Re: Velodyne VA-810
Organization: University of Illinois at Urbana
Date: Thu, 30 Jul 1992 18:23:08 GMT

ianchan@leland.Stanford.EDU (Ian Hin Yun Chan) writes:

>Velodyne is a name I always hear associated with subs. Are they good? In
I think that is all they make. ?
>particular, do they have ACTIVE subs? The ad for the VA-810 showed 'em w/
>a green LED in front, so I assume this particular model is... What's their
>performance like? How is crossover performed? And at what frequencies?
>Are these FAQs? :) I would appreciate if previous users could share their
>experiences with me.
>THANK YOU!
>- Ian
I just got the VA-1012, but listened to the VA-810 too.
810             1012
---             ----
50W AB amp      60W AB amp
(200 peak)      (240 peak)
35-85 HZ        28-85 HZ 
8" woofer       10" woofer
10" pas rad     12" passive radiator

both have line & speaker in and (high passed) line & speaker out
Hi pass X-over is 85 HZ (fixed) 6dB/octave.
Lo pass X-over is 6dB/octive (24dB ultimate)

They both sounded great to me.  Pretty clear bass -- they did
what they are supposed to do.  The VA-1012 seemed to have
considerably more "sub" to it -- not that get to enjoy it much
in an apartment building w/o pissing off neighbors.
Xref: sparky rec.audio:10814 rec.video:9536
From: brown@vidiot.UUCP (Vidiot)
Newsgroups: rec.audio,rec.video
Subject: Re: Four Channel vs. Five Channel Pro-Logic
Date: 24 Jul 92 17:47:13 GMT
Reply-To: brown@vidiot.UUCP (Vidiot)
Distribution: na
Organization: Vidiot's Hangout

In article <2A6DE312.12243@noiro.acs.uci.edu> harvey@cafws1.eng.uci.edu (Harvey Chen) writes:
<
<	Yes, there is a DEFINITE difference in adding the center channel.  I
<had regular Dolby surround for three years and just recently added a Dolby
<Pro-logic processor to my system and the difference is amazing.
<	Furthermore, when I just had Dolby surround, I sometimes had
<difficulty hearing the dialogue.  Adding Pro-logic eliminated that.
<	It sounds like you already have a Pro-logic processor, I would
<recommend that you go and get a center channel speaker and hear for
<yourself.
<
<Harvey

Apples and oranges.  You said that you went from Dolby Surround to Dolby
Pro-Logic Surround.  That is a difference in itself.  Try using your pro-
logic with and without your center speaker and report back.

I have no problem hearing the center dialog in phantom mode.
-- 
      harvard\     att!nicmad\          spool.cs.wisc.edu!astroatc!vidiot!brown
Vidiot  ucbvax!uwvax..........!astroatc!vidiot!brown
      rutgers/            INTERNET:vidiot!brown%astroatc.UUCP@spool.cs.wisc.edu
                                   brown@wi.extrel.com
Newsgroups: rec.audio
From: jog@kpc.com (Rajeev Jog)
Subject: Mail order experiences with "Abe's of Maine" ?
Organization: Kubota Pacific Computers Inc.
Date: Wed, 22 Jul 1992 23:57:02 GMT

Subject line says it all.  Please post or e-mail.

Thanks,

-- 
Rajeev Jog
------------------------------------------------------------------------------
Kubota Pacific Computer Inc.                                   +1 408 727 8100
2630 Walsh Avenue, Santa Clara, CA. 95051-0905, USA.               jog@kpc.com
Newsgroups: rec.audio,alt.folklore.computers,rec.music.cd
From: dap@portal.vpharm.com (David A. Pearlman)
Subject: Re: Two-sided CD's *DO* exist! (was Re: Life after CDs)
Organization: Vertex Pharmaceuticals, Inc.
Date: Thu, 30 Jul 1992 13:39:42 GMT

In article <1992Jul30.103759.17209@Informatik.TU-Muenchen.DE> reggel@Informatik.TU-Muenchen.DE (Hans-Juergen Reggel) writes:
>
>>>Yes, Polygram recently issued a promo-only CD single that features music
>>>on both sides (one side features a track from A Man Called (E); the second
>>>side features a track from Shakespeare's Sister). The minimal information 
>>>printed on the CD is confined to the blank space around the spindal hole.
>>>I'm not sure how they manufactured it.
>>
>>I had one of these.  It appeared to be two conventional CDs 
>>glued together.  I was curious about both artists, but I never got
>>to hear the disc; my CD player made the most awful mechanical noises
>>when it tried to spin the disc up, probably due to the excess mass
>>or thickness.  (My machine's a Magnavox front-loader, nothing special.)
>>So I guess this has to be counted as a promotional failure on 
>>Polygram's part.  :-)
>
>I got this CD, too. But I managed to solve the problem of playing it:
>After closing the tray (got a DENON DCD 1520) i hold it closed and press
>the OPEN/CLOSE button twice in short success. The CD is 'shaked' so that
>it falls upon the post. 
>You could also try a LD player, which is made for thicker and heavier Discs.
>But after all, the songs are not very listenable but the gimmick is real good.


Oh contraire! The Man Called (E) song is very listenable (the entire
Man Called (E) album is highly reommended to those who like '60's
influenced pop). Shakespear's Sister is....well, I guess they're
popular in the UK, anyway...

dap
-- 
=============================================================================
    David A. Pearlman

Vertex Pharmaceuticals Inc.                     email: dap@vpharm.com
Newsgroups: rec.audio
From: sbradley@scic.intel.com (Seth Bradley)
Subject: Re: Advice on ordering from J$R Music World
Organization: Intel SCIC, Beaverton, OR
Date: Thu, 23 Jul 1992 14:48:59 GMT

In article <1992Jul23.134722.19694@mlb.semi.harris.com> gmc@analog.mlb.semi.harris.com (Jerry Cotreau) writes:
>commission. I don't care for this practice, but I order from
>J&R anyway because I can usually get my price, and other than
>that J&R is first class in every way.

Another thing to keep in mind is that J&R has a 30 day "lemon" policy
(if it breaks within 30 days, you get a new one - no hassles with
getting service).  The "industry standard" is only 7 days.  This is
a major plus for J&R.  The only other company I know of who offers
this is Crutchfield, though except for specials their prices are
higher.
-- 
Seth J. Bradley
Internet: sbradley@scic.intel.com   UUCP: uunet!scic.intel.com!sbradley
----------------------------------------
"A system admin's life is a sorry one.  The only advantage he has over
Emergency Room doctors is that malpractice suits are rare.  On the other
hand, ER doctors never have to deal with patients installing new versions
of their own innards!"  -Michael O'Brien
Xref: sparky rec.audio:10999 alt.folklore.computers:11415 rec.music.cd:5633
From: krj@netsun.cl.msu.edu (Ken Josenhans)
Newsgroups: rec.audio,alt.folklore.computers,rec.music.cd
Subject: Re: Two-sided CD's *DO* exist! (was Re: Life after CDs)
Date: 29 Jul 92 15:53:35 GMT
Organization: Michigan State University

In article <1992Jul27.182147.1332@portal.vpharm.com> 
         dap@portal.vpharm.com (David A. Pearlman) writes:
>Yes, Polygram recently issued a promo-only CD single that features music
>on both sides (one side features a track from A Man Called (E); the second
>side features a track from Shakespeare's Sister). The minimal information 
>printed on the CD is confined to the blank space around the spindal hole.
>I'm not sure how they manufactured it.

I had one of these.  It appeared to be two conventional CDs 
glued together.  I was curious about both artists, but I never got
to hear the disc; my CD player made the most awful mechanical noises
when it tried to spin the disc up, probably due to the excess mass
or thickness.  (My machine's a Magnavox front-loader, nothing special.)
So I guess this has to be counted as a promotional failure on 
Polygram's part.  :-)


-- 
--Ken Josenhans
    BITNET:  13020KRJ@MSU     Internet: 13020KRJ@msu.edu