Joe;
Let's say I use one of the NLS players playing back at normal tape
speed a NLS book which was recoded at 1/4 speed. Would that work? Also
would it be possible to detect the tone indexes on the NLS tapes such
that the recording could be broken down into seperate recoding? I'm
trying to devise a method of converting NLS books into Daisy recordings.
By the way I have been pushing Daisy playback hard at Apple. I've had
a few meeting with the documentation people there about it. Any word
on when I can try out your latest work? I'm beta testing 10.5 as well
as the new NLS Daisy books now.
Greg
On Dec 28, 2006, at 08:43 , Kafka's Daytime wrote:
Hi Greg,
I built a system for one of the libraries that did/does automated
conversion of taped audiobooks to digital. To speed the process
significantly, we custom-modified tape machines to play at higher
speeds and then pitch-shifted the digitally recorded audio to return
to normal speed. I don't recall what the threshold was, but you have
to find a happy balance between speed going in (and resulting
bandwidth loss) and artifacts resulting from pitch-shifting (i.e. if
you go in too fast your audio will get mangled in a too-dramatic
pitch shift and bandwidth loss will be too great).
For a home version, you might be able to use one of the Marantz tape
players (or Narrator model or similar) to play taped audio in at
higher speed - into Audalyze, for instance - and then apply pitch
shift to slow audio down.
Ripping at Fast Forward speed will not work as all of the audio's
frequency information gets mangled when played at Fast Forward and
the Fast Forward speeds will generally be too fast i.e. the factor
of pitch shift required and bandwidth lost will be too great.
There is more information in the patent abstract if you care to
search USPTO.gov for patent number 6,710,955.
Hope that helps,
Joe
On Dec 28, 2006, at 9:42 AM, Greg Kearney wrote:
While we're on this topic I would like to know if there is a way to
rip tapes at fast forward speed and then slow them dow to normal
speed in the computer. This would speed up the process of ripping
taped books as you would not have to play them into the sound
recoding software at the normal speed.
Greg Kearney
On Dec 27, 2006, at 22:19 , louie wrote:
Also you can rip NLS tapes using sound studio.
On Dec 27, 2006, at 9:03 PM, Cheryl Homiak wrote:
Our local libraries here in Madison have a lot more on cassette
than on cd as far as books and quite a few of them are abridged,
which I hate. but for books which are available this certainly
works and in fact, with a line-in setup and audio hijack pro it
isn't really difficult to make files of cassettes either.
--
Cheryl
"Where your treasure is, there will your heart be also."
