Use of forward pressure level to minimize the influence of acoustic standing waves during probe-microphone hearing-aid verification

• DOI: 10.1121/1.3143142
• Publication Date: 2009-07-15T22:52:11Z
• Authors: Ryan W. McCreery; Andrea Pittman; James Lewis; Stephen T. Neely; Patricia G. Stelm...
• Keywords: Hearing aid

Probe-microphone measurements are a reliable method of verifying hearing-aid sound pressure level (SPL) in the ear canal for frequencies between 0.25 and 4 kHz. However, standing waves reduce accuracy these above Recent data suggest that speech information at up to 10 kHz may enhance perception, particularly children. Incident reflected components stimulus can be separated, allowing use forward (incident) as measure level. Two experiments were conducted determine if output provides valid estimates in-situ canal. In experiment 1, SPL obtained tympanic membrane medial end an earmold ten adults. While within-subject test-retest reliability was acceptable, measures near reduced influence two participants. 2, found unaffected by Implications clinical assessment amplification discussed.