Audio Specifications and Standards

From UA Libraries Digital Services Planning and Documentation
(Difference between revisions)
Jump to: navigation, search
(Resources and Links:)
(Default File/Output Settings)
Line 14: Line 14:
 
**typically, 2s of silence is left or created at the beginning of each .wav, with 1s at the end.  
 
**typically, 2s of silence is left or created at the beginning of each .wav, with 1s at the end.  
 
**RMS levels are typically set fairly low, to -25db
 
**RMS levels are typically set fairly low, to -25db
* <u>deliverables</u>: .rm/RealAudio v. 8 at 16-bit/44.1kHz, 105 kbps (stereo)
 
** in the near future, our workflow will allow for some enhancement of the Real Audio files (dynamic range compression, higher RMS levels) in order for delivery of pragmatic derivatives; with the preservation .wav file unaffected by such enhancements.
 
  
<font color="red">Update 082809: Real Audio will not be the preferred delivery format as we began use of alternate delivery methods. MP3s will be created with the [http://lame.sourceforge.net/| Lame Encoder] using the following setting:
+
   For information on derivatives, see [[For_Creating_Derivatives]]
   % lame sample.wav sample.mp3 -V4 --noreplaygain --nohist -S
+
 
+
These setting were decided upon after consulting the [http://wiki.hydrogenaudio.org/index.php?title=Lame#Portable:_background_noise_and_low_bitrate_requirement.2C_small_sizes| Hydrogen Audio] site.
+
</font>
+
  
 
====Associated Hardware====
 
====Associated Hardware====

Revision as of 13:09, 28 June 2010

Contents

Introduction:

The following provides a brief overview of our standard audio specifications.



Technical Information:

Default File/Output Settings

  • masters: .wav/WAVE at 24-bit/44.1khz
    • note: IASA TC-04 calls for a minimum sampling rate of 48kHz (preferably 96kHz) [1]. We will discontinue use of 44.1kHz sampling rates pending confirmation of appropriate storage space as 24/48 vs 24/44.1 should yield only an 8% increase in space requirements.- arora, 051309
    • typically, 2s of silence is left or created at the beginning of each .wav, with 1s at the end.
    • RMS levels are typically set fairly low, to -25db
  For information on derivatives, see For_Creating_Derivatives

Associated Hardware


Resources and Links:

Personal tools