Audio Forensics ???

Discussion in 'rec.audio.pro' started by Hi-Soft, Aug 27, 2003.

  1. Hi-Soft

    Hi-Soft Guest

    Anyone know if it is possible to the aproximate the age of a recording on an
    audio cassette ?

    I have to have some cassette tapes analysed to determine if the recordings
    of some original songs were actually recorded either 4- 5 years ago, or
    recorded in the last few months !

    They are probably recorded on old tapes, so i can't even tell by the model
    of cassette !

    Any help or info would be greatly appreciated.....

    --

    Cheers,

    O
    [III\
    /""III ""\
    / III \
    bcanham@bigpond.net.au
  2. Mike Rivers

    Mike Rivers Guest

    In article <wJ03b.66511$bo1.19344@news-server.bigpond.net.au> bcanham@bigpond.net.au writes:

    > I have to have some cassette tapes analysed to determine if the recordings
    > of some original songs were actually recorded either 4- 5 years ago, or
    > recorded in the last few months !
    >
    > They are probably recorded on old tapes, so i can't even tell by the model
    > of cassette !


    Sounds like you suspect some fakery here. You might be able to tell if
    you had the machine that made the recordings. The bias would be at a
    fairly stable level, but still degradation of the flux on the tape
    could be affected by storage temperature, and attempts at partial
    erasure in the skulduggery.




    --
    I'm really Mike Rivers - (mrivers@d-and-d.com)
  3. Hi-Soft

    Hi-Soft Guest

    yeah exactly....We needed to compare some original recording to some recent
    ones to show how different they were, but now we suspect the original has
    been completely re recorded to sound very similar to our recent recordings !

    I guess if it's not possible to tell, it won't be admissable in courte ?

    --

    Cheers,

    O
    [III\
    /""III ""\
    / III \
    bcanham@bigpond.net.au

    "Mike Rivers" <mrivers@d-and-d.com> wrote in message
    news:znr1061992796k@trad...
    >
    > In article <wJ03b.66511$bo1.19344@news-server.bigpond.net.au>

    bcanham@bigpond.net.au writes:
    >
    > > I have to have some cassette tapes analysed to determine if the

    recordings
    > > of some original songs were actually recorded either 4- 5 years ago, or
    > > recorded in the last few months !
    > >
    > > They are probably recorded on old tapes, so i can't even tell by the

    model
    > > of cassette !

    >
    > Sounds like you suspect some fakery here. You might be able to tell if
    > you had the machine that made the recordings. The bias would be at a
    > fairly stable level, but still degradation of the flux on the tape
    > could be affected by storage temperature, and attempts at partial
    > erasure in the skulduggery.
    >
    >
    >
    >
    > --
    > I'm really Mike Rivers - (mrivers@d-and-d.com)
  4. Scott Dorsey

    Scott Dorsey Guest

    Hi-Soft <bcanham@bigpond.net.au> wrote:
    >yeah exactly....We needed to compare some original recording to some recent
    >ones to show how different they were, but now we suspect the original has
    >been completely re recorded to sound very similar to our recent recordings !
    >
    >I guess if it's not possible to tell, it won't be admissable in courte ?


    If anybody has a way of doing this, Wes Dooley will know.

    What is admissable in court I have no clue about, since your laws are very
    different than ours. In the US, just about anything can be brought in as
    expert witness testimony, no matter how outrageous and fraudulent. But the
    other side can do the same thing too.
    --scott

    --
    "C'est un Nagra. C'est suisse, et tres, tres precis."
  5. Hi-Soft

    Hi-Soft Guest

    haha....you poor bastards over there have some histerical laws ... but don't
    worry we have a fair share too !

    --

    Cheers,

    O
    [III\
    /""III ""\
    / III \
    bcanham@bigpond.net.au

    "Scott Dorsey" <kludge@panix.com> wrote in message
    news:bijio5$mct$1@panix2.panix.com...
    > Hi-Soft <bcanham@bigpond.net.au> wrote:
    > >yeah exactly....We needed to compare some original recording to some

    recent
    > >ones to show how different they were, but now we suspect the original has
    > >been completely re recorded to sound very similar to our recent

    recordings !
    > >
    > >I guess if it's not possible to tell, it won't be admissable in courte ?

    >
    > If anybody has a way of doing this, Wes Dooley will know.
    >
    > What is admissable in court I have no clue about, since your laws are very
    > different than ours. In the US, just about anything can be brought in as
    > expert witness testimony, no matter how outrageous and fraudulent. But

    the
    > other side can do the same thing too.
    > --scott
    >
    > --
    > "C'est un Nagra. C'est suisse, et tres, tres precis."
  6. Well, without the original recorder of the event, songs, whatever, available
    to testify, it's not likely that anyone else is going to be able to verify
    the date of the recordings through forensics testing. Just as that Alien
    Autopsy testing at Kodak only turned up the fact that it was film stock of
    the time, or of 20 years later when they re-ran the production line again, a
    tape manufacturing expert could only attest to when that particular line of
    tapes were made.

    Generally, but again, here in the US, evidence is only allowed if it can be
    verified as to it's authenticity as to what's recorded. The evidence can't
    be allowed if there's no one to authenticate it. Part of the hearsay laws
    since the defendant wouldn't be able to cross-examine the evidence.

    Your best bet, if you haven't already done so, is to copyright your songs as
    they stand, and if the other guys have done the same, let the court decide
    if they are the same songs or not. If the other guys haven't copyrighted
    their music and only have an unverifiable tape in hand, it's not likely that
    they could wage a successful court challenge in any democracy.

    --


    Roger W. Norman
    SirMusic Studio
    Purchase your copy of the Fifth of RAP CD set at www.recaudiopro.net.
    See how far $20 really goes.




    "Hi-Soft" <bcanham@bigpond.net.au> wrote in message
    news:ZMc3b.67893$bo1.44441@news-server.bigpond.net.au...
    > haha....you poor bastards over there have some histerical laws ... but

    don't
    > worry we have a fair share too !
    >
    > --
    >
    > Cheers,
    >
    > O
    > [III\
    > /""III ""\
    > / III \
    > bcanham@bigpond.net.au
    >
    > "Scott Dorsey" <kludge@panix.com> wrote in message
    > news:bijio5$mct$1@panix2.panix.com...
    > > Hi-Soft <bcanham@bigpond.net.au> wrote:
    > > >yeah exactly....We needed to compare some original recording to some

    > recent
    > > >ones to show how different they were, but now we suspect the original

    has
    > > >been completely re recorded to sound very similar to our recent

    > recordings !
    > > >
    > > >I guess if it's not possible to tell, it won't be admissable in courte

    ?
    > >
    > > If anybody has a way of doing this, Wes Dooley will know.
    > >
    > > What is admissable in court I have no clue about, since your laws are

    very
    > > different than ours. In the US, just about anything can be brought in

    as
    > > expert witness testimony, no matter how outrageous and fraudulent. But

    > the
    > > other side can do the same thing too.
    > > --scott
    > >
    > > --
    > > "C'est un Nagra. C'est suisse, et tres, tres precis."

    >
    >

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