22 Aug
2004
22 Aug
'04
4:49 p.m.
On Sunday 22 August 2004 06:18 am, Frank Barknecht wrote:
Hallo,
Jason White hat gesagt: // Jason White wrote:
That'll only happen on 2 different circuits with different ground potential.
Buy a ground tester for a couple bucks at the hardware store and tap all
your power off the same outlet. Much cheaper than an isolation transformer.
You really don't even need the ground tester unless you're worried about
getting electrocuted (like a playing situation).
Although, if you have a lot of equipment, an IT might be worth the investment
as the mother of all surge suppressors.
My main interest at present is in making archival
recordings of
material that I originally recorded on audio cassette. My system
currently contains a C-Media CM8738 controller as part of the Asus
system board, which is recognized by Alsa. I assume that for quality
results I will need better sound hardware.
Not necessarily. Cassette tape is not exactly high end material. I
don't think, your recordings will suffer much by recording them with
the onboard card. But I don't know that special board and chip
combination, so I would recommend you just try it out.
If you're not afraid of a command line application, I highly recommend
ecasound for recordings. With the cute "ecasignalview" you can check
the recording levels, tune them with alsamixer, then just use:
$ ecasound -i alsa,hw:0 -o recording.wav
to record from the first card.
I asked this question of a local user's group
last year and was
informed that the M-Audio Delta 66 is of high quality and has good
Alsa support.
The 66 probably indeed is overkill for your task. I'd second the
suggestion of a cheaper stereo card based on the ICE1712 chipset, as
the Audiophile or some Terratec or Hoontech cards. There are a lot of
them.
It was further suggested that one of the USB A/D
converters could be
useful as it would also work on a laptop.
I'd only recommend USB for a Laptop. PCI is much easier to set up and
works more reliable. You also get "more bang for the buck" with PCI
cards, as USB cards tend to be a little bit overpriced. But if you're
on a budget and need one card for both laptop and stationary machine
(or if you hate screwdrivers), then USB is fine as well. It provides
enough bandwidth for high quality stereo recordings.
To connect to a cassette tape recorder is it
sufficient to run a cable
from its audio output to the input of the sound card, or is an audio
isolation transformer also necessary (not sure where one would acquire
this but I have heard that they are sometimes needed)?
Isolation is only necessary if you run into a ground loop: a buzzing
sound when both tape and PC are connected to the power line. You should be able to directly connect the tape to your
soundcard,
provided is has line-level inputs (most cards do). Personally I just
connected my computer to the monitoring Tape2 input/output of my hifi
amplifier, so I can also record from a vinyl record player if I want
to. (You cannot directly connect a record player to most soundcards
because of RIAA distortion, you need a real phono input.)
Actually, to use a phono level signal into regular line inputs you can use a
matching transformer or a preamp
Ciao