Use of high-rate envelope speech cues and their perceptually relevant dynamic range for the hearing impaired.

M.A. Stone, K. Anton, B.C.J. Moore

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The ability of hearing-impaired (HI) listeners to use high-rate envelope information in a competing-talker situation was assessed. In experiment 1, signals were tone vocoded and the cutoff frequency (fc ) of the envelope extraction filter was either 50 Hz (E filter) or 200 Hz (P filter). The channels for which the P or E filter was used were varied. Intelligibility was higher with the P filter regardless of whether it was used for low or high center frequencies. Performance was best when the P filter was used for all channels. Experiment 2 explored the dynamic range over which HI listeners made use of high-rate cues. In each channel of a vocoder, the envelope extracted using fc  = 16 Hz was replaced by the envelope extracted using fc  = 300 Hz, either at the peaks or valleys, with a parametrically varied “switching threshold.” For a target-to-background ratio of +5 dB, changes in speech intelligibility occurred mainly when the switching threshold was between –8 and +8 dB relative to the channel root-mean-square level. This range is similar in width to, but about 3 dB higher in absolute level than, that found for normal-hearing listeners, despite the reduced dynamic range of the HI listeners.
    Original languageEnglish
    Pages (from-to)1141-1151
    Number of pages10
    JournalAcoustical Society of America. Journal
    Volume132
    DOIs
    Publication statusPublished - 2012

    Keywords

    • speech
    • hearing aids
    • speech intelligibility
    • deafness
    • hearing

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