Investigating Room Acoustical Effects of Simulated Clinic Rooms on Sound-Field ASSR Measurements Using a Virtual Acoustic Environment

Valentina Zapata Rodriguez, Søren Laugesen, Cheol-Ho Jeong, Jonas Brunskog, James Michael Harte

    Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

    26 Downloads (Pure)

    Abstract

    Objectives:
    There is a growing interest in using sound-field auditory steady-state response (ASSR) to objectively
    validate hearing-aid fitting in pre-lingual infants. In practice, sound-field ASSR will be measured in clinic
    rooms with non-anechoic acoustic conditions. As the ASSR magnitude is dependent on the amount of
    modulation in the stimulus, any reduction due to room acoustics could affect the clinical viability of the
    sound-field test. This study investigates the relationship between observed soundfield ASSR magnitude and
    changes to stimulus modulation brought about by the acoustical properties of simulated clinic rooms.
    Methods:
    ASSR was recorded from normal-hearing adults in a virtual acoustic environment (VAE) where various clinic
    room sound-fields were simulated. The Phased Acoustical Radiosity and Image Source Method (PARISM),
    was used to simulate the various rooms. This was coupled with the nearest loudspeaker mapping (NLM)
    reproduction technique to control a spherical array of 65 loudspeakers within an anechoic chamber. ASSR
    was elicited with an ISTS-modified version of the narrow-band CE-Chirps presented at a nominal
    broadband level of 65 dB. This novel stimulus was created based on a two-octave-band wide chirp centred
    at 707 Hz, and two one-octave-band wide chirps centred at 2000 and 4000 Hz. Each band was presented at
    an individual rate in the 40, 90 and 90 Hz ranges, respectively. The ISTS modifications will eventually
    ensure that hearing aids under test will apply speech-appropriate gain and signal processing.
    Results:
    The noise-corrected ASSR amplitude, detection rate, and detection time were analyzed across all room
    conditions. Additionally, the detrimental effects of room acoustics on the stimulus modulation were
    quantified. The results indicate that the degradation of the stimulus modulation can be reflected in the
    ASSR measurements.
    Conclusions
    A virtual acoustic environment has been proposed to investigate the effect of clinic room acoustics on
    sound-field ASSR. We suggest that careful consideration should be taken concerning the room where
    sound-field ASSR measurements will be conducted due to the degradation of the stimulus modulation
    produced by acoustics of the measurement rooms.
    Original languageEnglish
    Publication date2019
    Publication statusPublished - 2019
    EventXXVI Evoked Response Audiometry Study Group (IERASG) Biennial Symposium - Sydney, Australia
    Duration: 30 Jun 20194 Jul 2019
    Conference number: 26

    Workshop

    WorkshopXXVI Evoked Response Audiometry Study Group (IERASG) Biennial Symposium
    Number26
    Country/TerritoryAustralia
    CitySydney
    Period30/06/201904/07/2019

    Fingerprint

    Dive into the research topics of 'Investigating Room Acoustical Effects of Simulated Clinic Rooms on Sound-Field ASSR Measurements Using a Virtual Acoustic Environment'. Together they form a unique fingerprint.

    Cite this