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Natural Science Forum / Physics / Acoustics / April 2005Audio recordings "leaching" onto adjacent tape sides?
Hi all, I'm aware that, in domestic compact cassettes, if you listen to a blank, or silent area on one side of a tape, you can hear a faint, reversed "echo" from the other side. I believe that this is due to the audio tape being very tightly wound and the magnetic impressions being imprinted onto the opposing side (...?) I was wondering if the following situation was possible. Suppose you have a reel to reel tape, with a recording on only one side - each side has two tracks. Would it be possible for a recording on a an adjacent side of the tape to "come through" to the top surface? For instance, if we have A - blank (side two, reel two) B - audio tracks (side one, reel two) C - blank (side two, reel one) D - audio tracks (side one, reel one) Would it be possible to hear a recording on side D, from side B? Best wishes Paul > I'm aware that, in domestic compact cassettes, if you listen to a > blank, or silent area on one side of a tape, you can hear a faint, > reversed "echo" from the other side. I believe that this is due to the > audio tape being very tightly wound and the magnetic impressions being > imprinted onto the opposing side (...?) Correct me if I am wrong. I believe there are two independent phenomena here: 1- "transfer" where one layer of tape lies on top of the turn below. In this case a weak transfer can occur. This can he identified as an "echo the appropriate time later (one circumference/tape speed). Is is equally likely that a transfer from the layer on top also occurs, so one may hear as many as THREE renditions; the proper one, one turn before and one turn after. I have heard this on some old 120 minute cassettes that have an extra thin substrate. 2- "cross-talk" where the playback head (possibly also the recording head) sprays a wide enough pattern of magnetism that some of it registers in the vicinity of the "other" pair of tracks. I have not heard this one (yet). > I was wondering if the following situation was possible. Suppose you > have a reel to reel tape, with a recording on only one side - each side > has two tracks. Would it be possible for a recording on a an adjacent > side of the tape to "come through" to the top surface? That's the one I have often heard. > For instance, if we have > A - blank (side two, reel two) > B - audio tracks (side one, reel two) > C - blank (side two, reel one) > D - audio tracks (side one, reel one) > Would it be possible to hear a recording on side D, from side B? If by "reel" you mean successive turns on a single spool, yes. Angelo Campanella Recording takes place on ONLY one side, call it the front side. NOT on the back. The typical 1/4" home stereo cassette tape has two heads (L & R) and records four tracks on on the tape, but only two at a time. Usually the record heads are positioned so they record the left and right tracks on the top 1/8 inch of the tape. Flipping the tape over, it then records on the 1/8 inch that was previously the bottom. There is a small, blank, gap between each track. Depending on the quality of the tape, alignment of the heads, and cleanliness of the heads, and probably a few other factors, there may be a bleed wher the signal get recorded on a wider portion of the tape tahn intended. Or the playback heads may be out of alignment just enough that they are picking up signal from the adjacent track. (Like not staying in your lane driving down the highway). As Ang mentioned, there is the possibility of bleed through with ultrathin tape, but I believe this is a thing of the past. Do a google search for "recording tape track layout" and you will find a number of articles. Regards, Dave Thanks my friend - is there any way for such an effect to be manifested on a belt recording that is not magnetic (ie. grooved, like a record)? Best wishes Paul I believe what you are referring to is called "print thorugh" thx, boB >Thanks my friend - is there any way for such an effect to be manifested >on a belt recording that is not magnetic (ie. grooved, like a record)? > >Best wishes > >Paul >>Thanks my friend - is there any way for such an effect to be manifested >>on a belt recording that is not magnetic (ie. grooved, like a record)? There can certainly be such an effect with gramophone (phonograph) records. But what sort of recording is grooved and on a belt?  SignatureTony W My e-mail address has no hyphen - but please don't use it, reply to the group. > I believe what you are referring to is called "print thorugh" > > thx, > boB Correct, and this is why studios always wind the tape "tail out", or backwards. That way, the print through will be less audible. |
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