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Re: [ARSCLIST] Archiving at double speed
At 02:13 PM 6/23/2006, Bob Wasserman wrote:
Some of material more recently has been used for
radio/tv/film/web, and I make a good realtime copy at that time,
but some people have even been happy with the double speed mastered
copies since they highly process the audio in editing anyway or
ends up as low-fi web files.
As we all know, noise is the enemy of achieving high compression
rates and high quality at the same time. The noise eats up the
bandwidth, especially when going for high compression rates. You can
see the same effect in JPEGs. Here's a quick test: scan a photo that
has been screened. Save it as a constant quality JPEG and look at the
file size. Then run gaussian blur in Photoshop so that the screening
just disappears. Even sharpen it again if you wish. Save it again as
a JPEG with the same quality setting. Look at the file size.
So, removing noise even if it sounds worse uncompressed may give an
overall better compressed file! It requires experimentation to
optimize the tradeoffs. Remember, while my JPEG example is dealing
with constant quality, MP3 files are generally set up as constant bit
rate (yes, I know there is a variable bit rate option).
As to Kevin's question, I said yesterday and I'd like to reiterate.
Anything that can transparently or almost transparently increase
throughput is worthwhile in attacking the mountain of tapes out there.
Cheers,
Richard
Richard L. Hess email: richard@xxxxxxxxxxxxxxx
Aurora, Ontario, Canada (905) 713 6733 1-877-TAPE-FIX
Detailed contact information: http://www.richardhess.com/tape/contact.htm
Quality tape transfers -- even from hard-to-play tapes.