Hi Shai,
No replies so far to the specific question so here goes. Yes given the
source I'd have no problem reducing down to 22kHz or even 11 uncompressed.
I would have thought MP3 at 256 kB/s (mono) would be more than adequate too.
It seems unlikely either would be anywhere near compromising the original
quality.
I take it that if the source noise floor is not compromised in the file
compression process, then by definition everything else will be fine also.
With MP3 type compression though, if it's set at too low a bitrate, tape
dropouts can become exaggerated, (eg: many YT uploads ) so just to be safe
I'd go for an MP3 rate to avoid that.
At 15/32 ips azimuth alignment must be fairly critical. Out of curiosity
how wide is the 40 track tape?
Tim Gillett
Perth,
Western Australia
----- Original Message -----
From: "Shai Drori" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Sunday, July 09, 2017 2:19 PM
Subject: [ARSCLIST] Small file formats
Hi Gang
Seeing the wisdom of the group. I am digitizing log tapes for a client.
Tapes are 40 tracks each generating 400GB per tape at 48kh/24bit. Obviously
there is nothing on those 15/32" IPS tapes that needs that fidielity, and
my client doesn't have the storage capacity for all her tapes (lot of
them). So the question is what format should we compress to. MP3 at 256KB/s
is one option, staying with wave but reducing the sampling to 22Khz/16bit
is another (not sure it's small enough), maybe even 11Khz? Other options?
As you can imagine the audio is worse than AM but I do want to keep it as
close to the original as possible. Manufacturer claims top freq at around
3Khz.
בברכה,
שי דרורי.
מומחה לשימור ודיגיטציה של אודיו וידאו ופילם 8-35ממ
Cheers
Shai Drori
Expert digitization services for Audio Video
Hi Res scanning for film 8mm-35mm
Timeless Recordings Music Label
www.audiovideofilm.com
[log in to unmask]
Tripadvisor level 5 contributor, level 10 restaurant expert
---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
|