Audio Technology



Frequency response
Polar Patterns
Proximity effect
Cabling and phantom power

Recording techniques

Recording environment
Microphone placement
Signal processing and special effects


Recording devices

Analog recorders
Digital recorders
DAT recorders
Minidisk recorders
PC card and CD-R recorders
Hard disk recorders


A-to-D conversion

Improving audio digitization
Digitization workflow

Analysis and Delivery

Preparing files for analysis and delivery
Digital restoration
LPC in acoustic analysis

Audio Technology / A/D conversion and digital audio signal transfer / Audio digitization workflow...

Audio digitization workflow:

  1. Prepare the analog original (use appropriate techniques, such as tone callibration, restoration, baking, etc.)
  2. Route the signal through a mixing board AUX send/return or Channel insert/return into a compressor/limiter - only for "soft" tapes with significant amplitude variability.
  3. Send the signal to a stand-alone A/D converter
  4. Send the digital audio data stream to a PCI capture card via AES/EBU or S/PDIF
  5. Make 2 CD-ROM (ISO standard) copies of the master file
  6. Initiate script to process and move the "working" audio files into the digital repository.

The batch script may inlude:

  • downsampling to 22,050 Hz
  • changing the resolution to 16 bit with dither and noise shaping
  • 2:1 compression at -18 dB
  • noise reduction
  • RealAudio encoding

Audio Technology
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Last updated: 2002

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