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#1 |
Regular Crew
Join Date: Oct 2003
Location: Corvallis, OR
Posts: 109
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sony premium vs. excellence tapes
I had some posts on this already but I was wondering if there is a significant different in the Sony Premium and Excellence tapes to warrant the price difference? What is it exactly that makes the excellence tapes better? Is it lower drop out rate, resolution, re-usability etc? Can't seem to get a clear ansewer on this.
Thanks for you help, Michael |
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#2 |
Trustee
Join Date: Mar 2002
Location: Ann Arbor, MI
Posts: 1,334
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Excellence tapes have a 2dB(?) better signal to noise ratio than Premiums.
This is supposed to help with dropouts and other error correction issues. I use both, but I go with EX when the gig is real and not on my dime.
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Jacques Mersereau University of Michigan-Video Studio Manager |
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#3 |
Regular Crew
Join Date: Oct 2003
Location: Corvallis, OR
Posts: 109
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what are the other error correction issues?
Thanks for the advice though, Michael |
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#4 |
Trustee
Join Date: Mar 2002
Location: Ann Arbor, MI
Posts: 1,334
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Because the digital signal is all 0s and 1s being transferred
at incredible speed off of a tiny record footprint, there are always errors happening in the bit stream TMK. Error correction tries to figure the errors out, make them good and output a readable signal. On expensive "pro" tape decks there are more levels of error correction than on camcorders and cheap decks. I was told by an expert repairman that DVCPro AJ-D640 has three levels of error correction and therefore will sometimes playback tapes that most other decks cannot. There is A LOT of voodoo and trouble shooting going on under the hood of which we are blissfully unaware. Data loss or "replacement" is one reason why DV is NOT lossless. 0s and 1s are being swapped all the time, but it is not noticeable until it IS noticeable. That's the idea behind a tape that has a higher signal to noise ratio. More signal (good stuff) to noise (errors).
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Jacques Mersereau University of Michigan-Video Studio Manager |
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