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CD-R Output [AUD-D1]

Record Type: Audio Recordings

Expected Use: Distribution Copy

Product Name: CD-R Output [AUD-D1]

Product Purpose: This file is burned to a CD-R as a Digital Audio Compact Disc and served in National Archives and Records Administration (NARA) Moving Image and Sound research rooms as a distribution copy.

Nature of Source Material: Any digital preservation or reproduction master file.

File Properties

Delivery Mechanism
  • "Red Book" or Compact Disc Digital Audio system (CD-DA)format
  • Recorded to CD-R
Capture Information
  • Encoded to Linear Pulse Code Modulation (LPCM)
  • Sampling frequency: 44.1 kHz
  • Bit depth: 16
  • Sound field: stereo

Typical file size: ~ 10.5 MB/minute or .635 GB/hour

Quality Control

Quality Control for CD-R Output Products

The Audio Video Lab relies on auditory quality control (QC) and spot checks to confirm completeness of CD-R.

Rationale

Reproduction masters are at a high enough quality that they may be used in a production context.  Distribution copies are at a low enough bitrate that they are able to be easily streamed or downloaded via an internet connection.

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