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The copied tapes are duplicated with this encoding of shifted frequencies. The encoder basically boosts the upper frequencies while the audio is quiet, and doesn’t boost as much when the audio is loud (relative to a set threshold). The original master is run through a Dolby encoder. It does not fix a sound master with unwanted noise. If you like the sound of your original master, you don’t need Dolby.ĭolby B for cassettes is intended to reduce tape noise on copied tapes, while leaving the original audio unchanged. National Audio doesn’t recommend that you have Dolby applied if your listeners may not all have Dolby capabilities on their playback devices. Should I choose to apply Dolby B to my audio? Jonathan T14:06:39+00:00 Should I choose to apply Dolby B to my audio? It is archived and re-used unless you request additional audio changes on subsequent re-orders. We add a small one-time charge for a duplication master to your first order. They simply ensure that output levels are uniform on the left and right channels and consistent on all tracks maximizing the sound for the cassette format. Our engineers do not sonically alter your audio, unless requested. The duplication master also contains inaudible control tones and other automation data to operate our duplicating system. We create a master which is used to feed program material (sound) to as many as 20 slave duplicators. We do not duplicate from a master cassette. This produces cassettes with a higher output level, lower background noise, less wow and flutter, and a 55-60 dB crosstalk rejection between tracks. National Audio duplicates cassette tapes on high-speed, studio-quality, open-reel tape recorders known as duplicating slaves. In case you didn't know.If I provide my mastered audio to NAC, why do I have to pay for a duplication master? Jonathan T14:27:42+00:00 The output of this command would be the actual images (clientname_1409261547).īpimagelist would also give you information about what type of backup it was. In your case it would be some LTO2 and LTO6 tapes (unless you expired the images from LTO2 media already).Īlternatively you can use the bpimmedia command to query what is on a media. NetBackup would then come back with a list showing you where the images reside. In both cases you'd specify the client name and the start/end for your search. You can query the catalog for these images by using the Catalog section in the Remote administration console, or you can do it via cli using bpimagelist. This is a combination of clientname and a timestamp. During your imports you might have seen reference such as clientname_1409261547. We create backup images, and those images are kept on tape/disk. NetBackup doesn't have "tape sessions" as you call it. And once imported you duplcated them to LTO6. Just to clarify, you had a bunch of media with backups on them from some other domain, or backups that had expired but you still had the media available and probably in a write protected state.