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Characterization of external ear impulse responses using Golay codes.

B Zhou1, D M Green, J C Middlebrooks

  • 1Psychology Department, University of Florida, Gainesville 32611.

The Journal of the Acoustical Society of America
|August 1, 1992
PubMed
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Golay codes offer an effective method for measuring the human ear canal resonance and pinna transfer function. This technique significantly improves signal-to-noise ratio, providing precise acoustic measurements of the external ear.

Area of Science:

  • Acoustics
  • Bioengineering
  • Signal Processing

Background:

  • Accurate measurement of the external ear's acoustic properties is crucial for audiology and hearing aid design.
  • Traditional methods may face limitations in signal-to-noise ratio and computational efficiency.

Purpose of the Study:

  • To introduce and evaluate the application of Golay codes for probing the impulse response of the external ear.
  • To assess the efficacy of Golay codes in measuring human ear canal resonance and pinna transfer function.

Main Methods:

  • Utilized complementary Golay codes, a series of binary numbers, for acoustic signal generation.
  • Employed a sealed sound-delivery system to measure ear canal resonance.
  • Used a free-field source to measure the transfer function of the pinna.

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Main Results:

  • Achieved a signal-to-noise ratio improvement approaching the theoretical 30.1 dB using two series of 512 binary Golay codes.
  • Demonstrated the capability of Golay codes to measure both ear canal resonance and pinna transfer function.

Conclusions:

  • Golay codes provide a robust and efficient method for characterizing the external ear's impulse response.
  • The technique offers advantages over maximal-length sequences, particularly its convenient sequence length for Fourier transform applications.