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Re: [ARSCLIST] cassette crackle
I have no information as to what equipment was used. However, it is my
suspicion that small mono machines were used. I have digitised some 600+
tapes over the past few months. Only a small percentage exhibit this
fault. I think what I need to do is to look at the transfers again and
establish what factors are common to those recordings which have
crackle. I suspect they are all mono recordings and using only the left
channel would be a workable solution.
It's odd. I sit in a darkened room listening to these things day in and
day out. After a while these little glitches start to really get to you.
Reading the messages on this board helps keep me sane. Keep up the
good work guys.
David Lennick wrote:
Dumb question (for various reasons, I can't listen to the file at the
moment). Were these cassettes all recorded on small mono portable
machines? Tapes made on these almost always have a crackly or noisy
right channel when played back on good decks and in stereo. The solution
here is simply to play only the left channel.
Mike Hirst wrote:
your advice is, as ever, well informed sagely and intelligent. I
suspect that I'm not going to find a definitives answer here, but for
your interest, and for anyone else who may be interested, I've posted
a 10sec (wav) clip of the kind of crackle I'm hearing. this sort of
thing will continue through the full length of the recording and can
be heard when the tape is played back using multiple recorders, all of
which have been tested using other tapes, which exhibit no such problems.
filesize= 1392640 byte(s)
riffsize= 1764036 byte(s)
format = Straight-PCM
channel = 2
depth = 16 bit(s)
blk.size= 4 byte(s)
smp.rate= 44100 Hz
samples = 441000
you will note from the clip that the crackle can only be heard in the
rh channel. this is typical of the phenomenon, but it can sometimes be
heard in both channels (with a bias towards the rh ch).
I have experimented with some of the de-crackle filters I use when
working with disc transfers and as Richard suggests, the crackle can
be removed, I am however curious as to where the crackle comes from.
Richard L. Hess wrote:
Tom Fine has already posted a number of good explanations.
There are, however, less-common explanations that you may wish to be
aware of, just in case.
(1) If there is a mismatch between the record machine record and
erase head track position, perturbations in the record bias and/or
erase MAY print to a tape like this. DC-(i.e. permanent magnet) erase
may also cause something like this, but it is usually more of a
"burbling" or what is sometimes called "rocks".
(2) Static electricity and PLAYBACK machine "glitches" CAN print to a
tape without the recorder being in record mode. It's uncommon
(thankfully), but it can happen. Static can be generated by fast
winding in a very dry environment, and depends on cassette materials
including the shell and slip sheets. This is more prevalent with
reels than cassettes.
This clicks can usually be removed (depending on their source) by a
declick/decrackle plug-in for your favourite DAW. The Magix
restoration tools version of this is the best I've yet owned, but I
haven't owned either DC7 nor the high-end Algorithmix version.
At 08:53 AM 2008-09-18, Mike Hirst
Here's a thing that's been confusing me for some time. I have spent
the past six months working my way through a large number of
cassette tapes mostly recorded between 1985 and 1995. every now and
again I notice light, but significant crackling. This is often more
noticeable in the right channel, but not exclusively so. On some
recordings this is louder, on most recordings this is not evident at
all. This is not restricted to any one brand of cassette, nor is it
associated with any one playback machine and/or soundcard. Can
anyone explain this for me?
Richard L. Hess email: richard@xxxxxxxxxxxxxxx
Aurora, Ontario, Canada (905) 713 6733 1-877-TAPE-FIX
Detailed contact information:
Quality tape transfers -- even from hard-to-play tapes.
16 Ocean View
Tyne & Wear
tel: 0191 289 3186