Depends a lot on what blurring means.
Blurring is normally applied to vision.
Think of some other descriptive terms for sound.
For example, "muddy sound" on a computer is caused by excessive
reverberation
added by the sound card driver. A tape deck has no such software inside
it, so can't make "muddy sound" on its own. The tape deck has limited
means to screw up. The frequency balance can be off, if a tape is
recorded in Dolby, and the deck doesn't have the appropriate
reversal of the method. I've had that problem here, where a tape
recorded with a later version of Dolby Noise Reduction (NR),
my deck can't undo that properly, and the high frequencies might be
too accentuated.
As for a recording method, connect the line-out of the tape deck,
to the line-in on the computer. Then use a sound recording application
(
http://audacity.sourceforge.net/ ). I believe that program has
a preference, to either temporarily store sounds in system RAM or
on the hard drive, in case it indicates a short recording time.
The last time I tried it, I think my record time was up to
24 hours straight. Meaning, I could play a tape continuously for 24 hours
and record it as a single track. If you have reel-to-reel, it
probably doesn't last that long, and won't exhaust the available
record time. Once you save a track and close the file, you have
the entire record time to use again.
Windows has a built-in application called Sound Recorder, that
also works, but there's a little trick to expanding the record
time.
In fact, both recording methods are tricky. In that, when I use
Audacity for this kinda work, I have to "bang on the controls a lot"
to get things adjusted right. It's hard to ensure the Line-In
is selected as the recording source for example.
The problem with tape recorders, as they age and get dirty, is with
the tape transport, and maintaining a constant speed. If I needed
to transcribe my small cassette collection, that would be my
first problem. The recording part is trivial. Cleaning the damn
transport rollers on that deck, is not. And I wouldn't buy another
tape deck, as a solution to cleaning the old one.
You can get cleaning tapes of various sorts, for attempting to
keep a deck clean, but you must use those regularly. Like
every 30 hours of deck usage, run the cleaning procedure. You
can't come along after 20 years of usage, and expect one usage
of a cleaning tape to make the thing "like new". It's like
rings around your bath tube. They never go away.
Paul