Ability to achieve gain/frequency response and SSPL-90 under three prescription formulas with in-the-ear hearing aids.
J Am Acad Audiol
; 4(1): 33-41, 1993 Jan.
Article
en En
| MEDLINE
| ID: mdl-8422481
Custom in-the-ear (ITE) hearing aids (standard linear amplifiers with single-pole-filter low-frequency tone control and a class A amplifier output stage) were fit to 90 ears using the revised National Acoustics Laboratories' formula (NAL-R), and to 20 ears each using Prescription of Gain/Output II (POGO II) and Memphis State University (MSU) formulas. Both real-ear insertion gain and 2-cc coupler gain were evaluated. Examination of differences between prescribed gain and that actually achieved in the fittings revealed that too much gain was often given in the low- and mid-frequency range and insufficient gain in the high frequencies. There was little difference among the formulas in the degree of deviation from target. For some fittings, the deviation resulted in poorer predicted speech recognition scores (modified Speech Transmission Index). For the POGO II and MSU methods, underfitting of prescribed SSPL-90 values was far more common than overfitting.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Audífonos
/
Pérdida Auditiva Sensorineural
Tipo de estudio:
Prognostic_studies
Límite:
Adult
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
J Am Acad Audiol
Asunto de la revista:
AUDIOLOGIA
Año:
1993
Tipo del documento:
Article
Pais de publicación:
Estados Unidos