DAT-Heads Digest #969
Contents:
Re:Mis -load (pkmin@rsc.rockwell.com)
Digital i/o Soundcards (Ryan Ellingson)
Zero-3-22-98 (FLECKFAN@aol.com)
British tapers heads-up!!!!!! (Edward B McGrath)
re:FS: aes/ebu interconnect (Coopers)
RE: A?D converters (Rick Shaich)
Try It You Might Like It! (gregp@bimamail.com)
anyone catch hornsby & marsalis?? ("Osman Balkan")
getting digital audio to/from a g3 mac... any ideas? (Brett)
Cranberries LA 5/19 DAT master ("mail.earthlink.net")
From: pkmin@rsc.rockwell.com
Subject: Re:Mis -load
Date: Fri, 21 May 1999 16:30:25 -0700
(the typical D7/8 misload/tape snaggage upon eject/blank tape syndrome)
" At the end of the show I rewound to the beginning.
When I got home hit eject and come to find out the tape is pulled out of the
case. I replaced the tape back in the cartridge and the played the tape with
no recording in sight at all. So I guess the Question is: Is this tape shot
now, can the music ever be recovered.What can I do to prevent this mistake
again?Thanks Bill"
The following may or may not work, but it can't really hurt if you want to take
every precaution possible. If you are the owner of a D7/8(especially an older
one which seem to have this problem more frequently), do not eject the tape
after the show. Instead leave it in and clone it(all the time keeping the deck
powered) Then make sure the clone turns out. Once you know you have a backup,
then eject the master. If it comes out snagged and "blank", it won't matter
since you have a backup. I have a suspicion (so take the following with a
grain of salt)that the times a tape misloads in a D7/8 or those times when it
doesn't come out snagged, and the music is fine for a while but then slowly
drifts into dropping out/blank mode, is encouraged when the door isn't shut
solidly/quckly enough(ie not closing it quickly/solidly increases the
probability for this to occur). A few weeks ago I was running late at a show
(like usual)had my D8/SBM in my fanny pack and was hurrying to get everything
going. I wasn't satisfied with how I closed my D8 (I like to quickly slam it
closed(you give the door a quick push from the fully open position and it ends
up "slamming" itself closed in a single quick motion), this time was a real
slow closing(since I had a bunch of stuff crammed in a small fanny pack which
made it difficult to slam closed)- pushing slowly until you hear the "click"),
but they were starting so I left it (and the whole show was thinking this tape
isn't gonna turn out bc I didn't slam the door shut). My suspicions were right
- the tape plays fine for a while then starts dropping out more and more until
finally its nothing but "blank" after about 40 minutes....Pete (can you say
"crappy loading mechanism")
From: Ryan Ellingson <rellings@earthlink.net>
Subject: Digital i/o Soundcards
Date: Fri, 21 May 1999 16:48:39 -0700
Hey Guys,
A couple of days ago, I claimed to have Word Document with comments
about Digital Soundcards on it and took requests to mail it to people.
I got many requests so I put some time into it to make it look nice and
read well. If you want a copy, or requested one but did not receive
one, please let me know and I will send it out.
I still would like more information about Digital in and out
soundcards. Any comments about them would be great. If anybody would
like to share a few must do's and must dont's about buying a digital i/o
soundcard, I sure would appreciate it. Has anybody used the Ego
Sys/Klay Anderson card yet, any comments?
Take it easy
Ryan
From: FLECKFAN@aol.com
Subject: Zero-3-22-98
Date: Fri, 21 May 1999 20:03:14 EDT
i have an extra copy of this show for trade. would really like to get a nice
dead show. e mail me if interested.
From: Edward B McGrath <sac19854@saclink.csus.edu>
Subject: British tapers heads-up!!!!!!
Date: Fri, 21 May 1999 17:20:17 -0700 (PDT)
PLEASE! PLEASE! Somebody tape this and get in touch with me. Especially
the Pavement. I just got this from the Matador News list so hopefully
someone can catch it. thanks- Barin
Attention, British! CORNELIUS, MOGWAI, and PAVEMENT recorded
live at the recent Bowlie weekender and will be aired on
Steve Lamacq's show on BBC Radio 1 this Monday, May 24th
from 8pm - 12am GMT. You can expect to hear Cornelius' set
around 9pm. Or if you live in the States, you can expect to
hear none of this.
From: Coopers <cooper@lightlink.com>
Subject: re:FS: aes/ebu interconnect
Date: Fri, 21 May 1999 21:44:16 -0400
correction to my FS: posting should read AES/EBU interconnect
my bad thom
From: Rick Shaich <Rick.S@XiChron.com>
Subject: RE: A?D converters
Date: Fri, 21 May 1999 22:18:46 -0400
Well that's a long question but here is a start.
There are two types of AD converters R2R and Delta Sigma..
There are other types, but they are all basically variations of those two.
R2R tend to be older.. or more audiophile market.. they require more
outboard parts to make them work. They are based on laser trimmed resistors..
The quality of the ADC is based on quality of the conversion process.
They tend to be more linear but higher distortion do to trimming errors.
Analog Devices used to be king of the R2R ADC.. lately most of them
are coming from Burr Brown.
Since there are not to many R2R ADCs floating around anymore I
won't discuss them right now.
Delta sigma ADCs are the newer ADCs.
The big difference here is over sample number.
Early ADCs are 4x... the latest are 128x with every 2^x in between.
Oversampling modulation pushes the frequency of modulation over the
nyquest frequency.. for example (assuming 44.1Khz sample)
a 8x modulates at 8xFS (352.8Khz) a 128FS is 5.6448. What this
does is push the noise out of the audio band. the higher the oversampling
number the further out of band the noise and distortion components are.
Further refinements come from dual bit ADC (two ADCs running in
push - pull) for lower noise.. The latest ADCs like the AKM 5392/5393
and Crystal 5396 use Noise shaping technology.
Early ADCs were known to display Birdies and Idle tones, by using
noise shaping and high oversampling rates these Birdies and Idle
tones have been mostly eliminated creating a "white" noise floor which
is more desirable.
Further refinements are made by more accurate references and lower noise
references in the ADC. Noise on the Reference can show up on the output.
Some folks like Crystal have made separate dies in the ADC for left, Right and
Digital sections. While this improves cross-talk and noise a bit it makes the
ADC much more expensive. Folks like AKM are using a smaller micron process
for more space and a single wafer for lower cost.
Also AKM ADCs are single ended requiring an external reference, but only
one power rail. Crystal is bi-polar supplied which eliminates the need
for an external reference, but requires a negative rail.. this makes the
Crystal ADC easier to design with in the AC studio world but harder
for battery powered situations where the negative rail either takes a second
battery or a switching power supply (which can be noisy).
Lastly some ADCs have balanced inputs, while some are single ended.
A single ended input will transfer all noise throughout.
A balanced input assumes that any noise is "common mode" and
will cancel out on the differential front end.
Hope this gets you started..
Try reading some Data sheets from AKM, Crystal, Burr Brown and Analog Devices
for more info.. perhaps start with AKM as they pretty much own the market these days.
Hawker
P.S. Just finished a design with the AKM5392... got boards back a week ago...
can't wait to hear how it sounds!! The DAC (4392) was VERY impressive.
Also while we are at it... does anyone reading this have a data-sheet
for the Tascam ADC (the AKM 5340). Since that is a Japanese AKM
product I can't get the datasheet from AKM USA. (The Jap/USA issue
is another long story) I could really use this data sheet!
>I am trying to learn more on the conversion process. What makes some
>coverters better than others? For example, what makes the DA-P1's or
>HHb's A/D better than the D7/8? Hmm, perhaps someone thinks it is the
>other way around??? What is it about the external converters, e.g.
>ADC-20 or A/D-1000. that make them superior to internal?
>What deck(s) on the market have the best converters?
>
>Thank you,
>
>Eric
************************************************
Rick Shaich KD4TPB CET
Rick.S@XiChron.com Hawker@Connriver.net
WWW.XiChron.Com
(802) 291-6131 voice (802) 291-6132 Fax
(910) 251-9140 Home Office Voice & Fax
************************************************
From: gregp@bimamail.com
Subject: Try It You Might Like It!
Date: Fri, 21 May 99 21:13:01 EST
[The archivist didn't Like It]
From: "Osman Balkan" <obalkan@borg.com>
Subject: anyone catch hornsby & marsalis??
Date: Sat, 22 May 1999 00:46:59 +0300
Hey all,
I caught the last 15 or so seconds of Bruce and Branford Marsalis doing the
national anthem for the opening of an nba game.. I was just curious to see
if anyone might have taped it?? I'm not really extremely interested, i just
it would be nice to have... even on an analog tape or something...
thanks for the space!
-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
Osman Balkan
Obalkan@borg.com
-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
"We are all driven by an invisible whip. Some run, some have fun, some are
hip, some tip, some dip, but we all must answer to the invisible whip."
- Rahsaan Roland Kirk, 1969
From: Brett <phabel@nsw.bigpond.net.au>
Subject: getting digital audio to/from a g3 mac... any ideas?
Date: Sat, 22 May 1999 16:23:28 +1000
hi all,
i am looking at doing a bit of editing/mixing/mastering on my beige g3
mac, i am a pretty much clueless when it comes to what type of cards etc.
i would need in order to achieve this, so if anyone has this type of
setup or knows how i would go about it your suggestions/comments would be
greatly appreciated...
i would want to transfer the audio from my dat deck digitally onto my
mac, then edit/mix/master it, and then transfer it back to dat
digitally...
any ideas?
thanks,
Brett
================================
http://users.bigpond.net.au/bah/
From: "mail.earthlink.net" <carmel@earthlink.net>
Subject: Cranberries LA 5/19 DAT master
Date: Sat, 22 May 1999 01:01:49 -0700
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recently taped the cranberries at LA's wiltern theatre with an AT831b =
mic. very nice clean sounding tape. runs 100 min or so.
looking for stone roses, verve, oasis, ian brown, charlatans uk...
thanks.
=======_NextPart_000_0004_01BEA3EE.AC206260
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charset="iso-8859-1"
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN">
<HTML>
<HEAD>
<META content=3Dtext/html;charset=3Diso-8859-1 =
http-equiv=3DContent-Type>
<META content=3D'"MSHTML 4.72.3110.7"' name=3DGENERATOR>
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<BODY bgColor=3D#ffffff>
<DIV><FONT color=3D#000000 size=3D2>recently taped the cranberries at =
LA's wiltern=20
theatre with an AT831b mic. very nice clean sounding tape. =
runs 100=20
min or so.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>looking for stone roses, verve, =
oasis, ian=20
brown, charlatans uk...</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><FONT color=3D#000000 size=3D2>thanks.</FONT></DIV></BODY></HTML>
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