glassner@unc.UUCP (Andrew S. Glassner) (12/06/84)
< ack ~nack > When I listen to a record, I can often hear the music that begins a track very faintly a second or two before the track actually begins. My understanding was that the wall between grooves was thick enough so that the stylus doesn't pick up the music embedded in the plastic on the other side of the wall. Is this true? In either case, where are the "ghosts" coming from? -- -Andrew Andrew Glassner decvax!mcnc!unc!glassner
jlg@lanl.ARPA (12/14/84)
> < ack ~nack > > > When I listen to a record, I can often hear the music that > begins a track very faintly a second or two before the > track actually begins. My understanding was that the wall > between grooves was thick enough so that the stylus doesn't > pick up the music embedded in the plastic on the other side > of the wall. Is this true? In either case, where are the > "ghosts" coming from? This is an unmistakable sign that the recording was tape mastered. What you are hearing is caused by the tape being magnetized by the data that is on adjacent layers as the tape is wound on the spool. A good recording engineer will use thicker tape and will not let the recording level exceed the threshold of this bleed-through effect. However, there are a number of recordings with this problem on the market.
mikey@trsvax.UUCP (12/18/84)
If the sound ghost comes exactly 1 revolution of the record early, it's very unlikely it's the tape. It's probably the grove distortion. If it is not exactly 1 revolution early, then it came from somewhere in the mastering process, probably tape printthru. mikey at trsvax
jlg@lanl.ARPA (12/22/84)
> > > If the sound ghost comes exactly 1 revolution of the record early, > it's very unlikely it's the tape. It's probably the grove > distortion. If it is not exactly 1 revolution early, then it > came from somewhere in the mastering process, probably tape printthru. > > mikey at trsvax Don't sit close looking at your records, time them. If the ghost is 1.8 seconds (1 min/33 rpm) before the correlated signal, then the record pressing is at fault. If it isn't, then tape mastering is probably the culprit. Most cases I've seen are caused by tape mastering (in fact, they usually are re-releases of older performances which have probably been archived on tape for several years - the tape blead-thru problem gets worse with age). Of course, depending upon the diameter of the tape reel, tape ghosts could also be delayed exactly 1.8 seconds. This is unlikely though. ------------------------------------------------------------------------------ The greatest derangement of the mind is to believe in something because one wishes it to be so - Louis Pasteur James Giles