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Journal of the Acoustical Society of America / Volume 130 / Issue 6 / PSYCHOLOGICAL ACOUSTICS [66]

Spectral loudness summation of nonsimultaneous tone pulses

J. Acoust. Soc. Am. Volume 130, Issue 6, pp. 3905-3915 (2011); (11 pages)

Wiebke Heeren1, Jan Rennies2, and Jesko L. Verhey1

1Department of Experimental Audiology, Otto-von-Guericke University, Leipziger Strasse 44, D-39120 Magdeburg, Germany
2Project Group Hearing, Speech and Audio Technology, Fraunhofer IDMT, Marie-Curie-Strasse 2, D-26129 Oldenburg, Germany

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The level of broadband signals is usually lower than that of equally loud narrow-band signals. This effect, referred to as spectral loudness summation, is commonly measured for broadband signals where all frequency components are presented simultaneously. The present study investigated to what extent spectral loudness summation also occurs for nonsimultaneously presented frequency components. Spectral loudness summation was measured in normal-hearing listeners with an adaptive forced-choice procedure for sequences of short tone pulses with varying frequencies, randomly chosen from a set of five frequencies. In addition, spectral loudness summation was measured for the simultaneous presentation of all five frequencies. The comparison stimulus consisted of tone pulses with the same frequency for all tone pulses of the sequence and the same repetition rate and overall duration as the test signal. The pulse duration was 10, 20, 50, or 100 ms and the inter-pulse interval ranged from 0 to 390 ms. In general, a considerable nonsimultaneous spectral loudness summation was found for short pulse durations and inter-pulse intervals, but a residual effect was also observed for the largest inter-pulse interval. The data are discussed in the light of repetition-rate dependent spectral loudness summation and effects of persistence of specific loudness after tone-pulse offset.

© 2011 Acoustical Society of America

ACKNOWLEDGMENTS

We thank two anonymous reviewers for their helpful comments. This study was supported by the DFG SFB TRR 31.

Article Outline

  1. INTRODUCTION
  2. METHODS
    1. Subjects
    2. Stimuli
    3. Procedure
    4. Statistical analysis
  3. RESULTS
    1. Experiment 1: Effects of inter-pulse interval
    2. Experiment 2: Effects of pulse duration
    3. Experiment 3: Effect of overall duration
    4. Experiment 4: Effect of reference
  4. DISCUSSION
    1. Spectral loudness summation for pulse trains
    2. Effect of tone duration in spectral loudness summation
    3. Role of persistence of specific loudness in nonsimultaneous spectral loudness summation
    4. Comparison with data in the literature on nonsimultaneous loudness summation
    5. Residual nonsimultaneous spectral loudness summation
    6. Implications for loudness models
  5. CONCLUSIONS

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KEYWORDS and PACS

Keywords

acoustic variables measurement, hearing, loudness

PACS

  • 43.66.Cb

    Loudness, absolute threshold

  • 43.66.Mk

    Temporal and sequential aspects of hearing; auditory grouping in relation to music

  • 43.66.Ba

    Models and theories of auditory processes

ARTICLE DATA

History
Received 26 Apr 2011
Accepted 19 Sep 2011
Revised 16 Sep 2011
Digital Object Identifier
http://dx.doi.org/10.1121/1.3652866

PUBLICATION DATA

ISSN

0001-4966 (print)  

Publisher

$abstract.society.value is a Member of CrossRef Acoustical Society of America

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