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Across-channel processes in frequency modulation detection

S Furukawa1, B C Moore

  • 1Department of Experimental Psychology, University of Cambridge, England.

The Journal of the Acoustical Society of America
|October 1, 1996
PubMed
Summary
This summary is machine-generated.

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Listeners better detect frequency modulation (FM) when it is coherent across different carrier frequencies. This suggests the auditory system integrates auditory information more effectively when temporal patterns align, enhancing sound perception.

Area of Science:

  • Auditory perception
  • Signal processing
  • Psychoacoustics

Background:

  • Listeners combine auditory information from various sources to perceive sound.
  • The integration of frequency modulation (FM) across different carrier frequencies is not fully understood.
  • Coherence, or the temporal alignment of frequency changes, may influence auditory detection.

Purpose of the Study:

  • To investigate how listeners combine frequency modulation (FM) information across different carrier frequencies.
  • To determine if coherent FM across carriers improves detection compared to incoherent FM.
  • To compare detection performance with predictions based on independent information processing.

Main Methods:

  • Psychometric functions were measured for FM detection on two sinusoidal carriers (1100 and 2000 Hz).

Related Experiment Videos

  • Experiments varied the temporal overlap (lag) and modulation rate (2.5-10 Hz) of FM across carriers.
  • A pink noise background masked auditory filters between carriers; stimuli had synchronous gating and raised-cosine ramps.

    • Main Results:

    • Coherent FM detection was often better than incoherent FM when modulation overlapped in time, especially at zero lag.
    • Performance for coherent FM exceeded predictions assuming independent processing and optimal combination.
    • Coherent FM detection remained superior at various modulation rates, particularly lower ones, and was significantly above independent processing predictions.

    Conclusions:

    • The auditory system demonstrates enhanced sensitivity to frequency modulation (FM) when it is coherent across carrier frequencies.
    • Coherence in temporal patterns of frequency changes facilitates auditory information integration.
    • These findings suggest a mechanism for improved sound perception through the auditory system's ability to leverage coherent across-frequency auditory signals.