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Understanding Auditory Masking: Types and Effects on Sound Perception

Explore the various types of auditory masking, such as ipsilateral and contralateral masking, forward and backward timing masking, critical bands in Fletcher masking, and binaural masking level differences. Understand how the perception of one sound is affected by the presence of another, and learn how to test thresholds and detect signals in different ear configurations.

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Understanding Auditory Masking: Types and Effects on Sound Perception

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  1. CHAPTER 11 MASKING

  2. MASKING The interference with the perception of one sound produced by the presence of a second sound Masking

  3. Masking Varieties: • EARS: Ipsilateral = Masker & Signal in same ear vs. Contralateral = M in one, S in other • TIMING: Simultaneous = M & S on at same time vs. Forward = M precedes S vs. Backward = M follows S Masking

  4. Masking

  5. Critical Bands: Fletcher Masking

  6. Masking Level Difference (MLD) Masker and Signal in Each Ear Test Threshold twice: • once with identical signals in each ear • once with 180 degrees out of phase R to L Binaural

  7. Masking Level Difference (MLD) (cont’d) • Signal is easier to detect with the interaural phase difference • Shift in threshold is about 12 to 15 dB at low frequencies. • Reflects processing in the auditory brainstem) Binaural

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