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Is It Okay to Use Compressed NU-6 Files for Clinical Word Recognition Testing?

H Gustav Mueller1, Jodi Rokuson2, Todd Ricketts1

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American Journal of Audiology
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File compression does not significantly impact word recognition scores using the Northwestern University Test Number Six (NU-6) materials. This finding holds true even with aggressive compression, suggesting audio file integrity is maintained for clinical audiology assessments.

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Area of Science:

  • Audiology
  • Speech-Language Pathology
  • Digital Signal Processing

Background:

  • Word recognition testing is crucial for diagnosing hearing loss.
  • Digital audio formats are increasingly used in audiology.
  • The impact of audio file compression on test validity requires investigation.

Purpose of the Study:

  • To evaluate the effect of Advanced Audio Coding (AAC) file compression on word recognition scores.
  • To determine if compression impacts scores obtained from the Northwestern University Test Number Six (NU-6) Auditec recordings.
  • To assess the clinical meaningfulness of any observed score differences.

Main Methods:

  • 86 adult participants (170 ears) were tested.
  • 25 difficult words from four NU-6 lists were used.
  • Word recognition was measured with both compressed (AAC) and uncompressed audio files.

Main Results:

  • Differences exceeding critical ranges occurred in ~7% of cases, close to chance.
  • Linear mixed-effects models showed no significant effect of file compression on NU-6 scores.
  • No significant interactions were found between compression, age, or hearing loss severity.

Conclusions:

  • Audio file compression, even at 64 kbps, did not yield statistically or clinically significant changes in NU-6 word recognition scores.
  • While uncompressed files remain ideal, compression appears safe for these specific Auditec materials.
  • Results support the potential use of compressed audio files in certain clinical audiology contexts.