fritzz@sdccsu3.UUCP (fritzz the Zebra) (08/28/84)
A little bit over a week ago I asked the net a question about why one can weakly hear a song before it starts on a record. In response I got two main answers, both of which I had suspected in the first place. One of these reasons is print through on the master tape, ie. where the magnetic information on a piece of tape rearranges the patterns on the next layer of tape on the reel. The other reason cited was called groove echo, in which the cutting tool deforms the master disk, and thus pushes the modulations over into grooves wich have alredy been cut. Responses varied from one end to the other, some stating that the problem was due entirely to print through ,and others saying that it was entirely groove echo. Then there were some responses saying that it could be one or the other depending on circumstances, which to me seems to be the most reasonable, although I still wonder which is the more prevalent cause. Thanks to all who replied. -- ihnp4--\ fritzz the Zebra decvax--\ akgua----\ *** BY YOUR COMMAND *** dcdwest---\ kgbvax-----\ ucbvax-------- sdcsvax -- sdcc3 -- fritzz
rfg@hound.UUCP (R.GRANTGES) (09/04/84)
[:-)] I have a moderately extensive classical record library and I quality- control audition records for one of the well known societies. Whenever I hear a case of pre-echo, and I've heard a lot of them, I ask it: "Are you tape print-through or groove interference?" The answers were running about two-to-one groove over tape when one day they admitted that they lie a lot. -Dick Grantges hound!rfg
mikey@trsvax.UUCP (09/07/84)
#R:sdccsu3:-222800:trsvax:55100054:000:621 trsvax!mikey Sep 7 09:43:00 1984 Time the echo. If it is exactly one revolution of the record, it is groove distortion. If it is not exactly one revolution of the record, it had to come from somewhere else, presumably tape print thru. mikey at trsvax I heard some time ago of a record processor that when cutting a master disk, would play it twice. Once to find out where the loud passsages were that were preceded by quite passages. This system would then give a slightly larger gap to the groves at the second tape playing and cutting process to limit the echo. I don't know if anyone is using this machine, but it sounded like a good idea.