title: Acoustic measures of low-frequency noise in extended high-frequency audiometry.
abstract: A very high signal-to-noise ratio is required for equipment designed for extended high-frequency audiometry because listeners with almost no hearing ability in the extended high-frequency range may have normal hearing sensitivity in the lower frequencies. Two commercially available systems designed for pure-tone audiometry were evaluated both in the conventional and extended high-frequency range. Unwanted lower frequency signals greater than the noise floor occurred predominantly at presentation levels of approximately 110 dB SPL or higher. Test tones in the extended high-frequency range should be restricted to levels that are not associated with lower frequency noise.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Schmuziger
authors.forename: Matthias
authors.initials: M
authors.lastname: Brechbuehl
authors.forename: Rudolf
authors.initials: R
authors.lastname: Probst
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D001299:Audiometry / Q000295:instrumentation*; D001307:Auditory Perception / Q000502:physiology; D006801:Humans; D009622:Noise