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Related Experiment Videos

Turning on a tone.

W M Hartmann1, D C Sartor

  • 1Department of Physics and Astronomy, Michigan State University, East Lansing 48824.

The Journal of the Acoustical Society of America
|August 1, 1991
PubMed
Summary
This summary is machine-generated.

Minimizing abrupt pure tone onset noise depends on frequency. Low frequencies benefit from a sine wave start (zero phase), while high frequencies require a cosine start (+/- 90 degrees phase) for quiet sound.

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Area of Science:

  • Acoustics
  • Psychoacoustics
  • Signal Processing

Background:

  • Abruptly introduced pure tones can generate audible onset noise.
  • The starting phase of a pure tone influences the characteristics of this onset noise.

Purpose of the Study:

  • To investigate methods for minimizing onset noise in abruptly introduced pure tones.
  • To determine the optimal starting phase for pure tones across different frequencies.

Main Methods:

  • Development of a spectral model to predict onset noise.
  • Conducting listening experiments to validate model predictions.

Main Results:

  • A spectral model predicted minimum onset noise for low frequencies with a zero-degree starting phase (sine wave).

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  • For high frequencies, minimum onset noise was predicted with a +/- 90-degree starting phase (cosine wave).
  • Listening experiments confirmed these predictions, showing a sharp frequency-dependent transition.

    • Conclusions:

    • The optimal starting phase for minimizing pure tone onset noise is frequency-dependent.
    • This optimal phase transition is influenced by the electroacoustical transducer and listener characteristics.