Playback Requirements and Technical Specifications of Digital Audio Files at the MSU Library

IMPORTANT NOTE:
Due to copyright restrictions, this directory contains a limited set of MP3 audio files derived from the digital wav masters.
The archived WAV files were originally sampled at different rates depending on the date of capture.

YOU MAY NEED TO CHANGE YOUR COMPUTER AUDIO AND/OR PLAYER SETTINGS TO
THE SPECIFIED RATE IN ORDER TO LISTEN TO THE SOURCE WAV FILES.


96Kb/32-bit Sampling Rate:
Most wav master audio files created since February 2009 were sampled at the higher 96kb/32-bit(float) resolution.  
Your system needs to be equiped with 96K compatible hardware and software in order to play the master wav files.
You may also need to adjust your hardware, codec and player settings.  Older systems may not be able to play them at all.  
In this case, you may be limited to playing these mp3 derivatives.  If there is no mp3 or other derivative available, 
please contact DMC/VVL techinical staff for assistance.

Pre 96K era notes:
The earliest digitization of audio in the MSU Library began in 1998.  
Since there were no archival standards or best practices for digital sound collections, 
the MSU Library had to established its own using available technologies, equipment and infrastructure.  
Large-scale digital media server storage was not yet available or afordable.  
Early files were originally stored on CD-ROM discs and sampled at lower rates to limit their size.
For more complete details, please refer to the following section.        


Detailed Technical Specifications of Master wav Files Sampled at 22K, 32K, 44K*, 48K* and 96K.
All digitial audio files were created on various Dell Windows PCs running Win-2000, XP-Pro or Win-7.

Hardware/Software (listed in reverse chronological order):

2009-present (current 96K sampling rate):

A/D Signal Source:
Yamaha 01V96 Digital Audio Mixer 
(with AES/EBU digital interface cable from mixer digital output to digital input located on PC sound card)
Sound Card: 
E-MU 1212M PCI audio card (includes 1010 PCI card and 0202 I/O daughter card)
with E-MU Digital Audio System Software/Drivers
Digital audio capture/editing software:
Adobe Audition-3, CS3, CS5
Audacity 2.0


Pre 96K era -
2001-2009 (44K and 48K sampling rates):

A/D Signal Source:
Yamaha 01V Digital Mixer
(AES/EBU digital interface cable from mixer digital output to AES/EBU input located on PC sound cards)
Sound Card: 
YAMAHA DS-XG WDM
Hoontech Sta Audio DSP24 MKII
Omni Studio by M-Audio (External A/D interface for PA system)
Digital audio capture/editing software:
Cool Edit-2000
Diamond Cut Audio Restoration Tools


1998-2001 (22K, 32K and 44K sample rates): 

A/D Signal Source:
Symetrix 620 A/D converter (with AES/EBU digital interface cable to Multi!Wav ISA sound card)
Sound Cards:
AdB  MultiWav! Pro24 sound card and BitWav driver
The Gina24 by Echo Digital (External A/D interface)
Digital audio capture/editing software:
Cool Edit-96
Diamond Cut Audio Restoration Tools
DartPro 32
WaveLab SE 24 bit Audio Editor


Unless otherwise noted, the standard setting for mp3 file derivative encoding is 64kb/sec, mono
(after resampling to 48K, 16 or 24 bit).

*Effective real-time wav sample rates when using the high speed time-compressed digitization method beginning in 2013:
44K (cassette), 48K (reel) 
	-actual high speed sample rate was 192K before speed/time conversion.