Differences between speech-shaped test stimuli in analyzing systems and the effect on measured hearing aid gain.
OBJECTIVE
To determine the effect of spectral differences between stimuli used for verification of hearing aid gain in nonlinear devices.


METHODS
The spectra of nine stimuli from five analyzing systems were obtained.


RESULTS
Most stimuli closely duplicated one of two well-specified spectra. The difference between these two input spectra resulted in measured gain differences of up to 8 dB.


CONCLUSIONS
Careful consideration of selected test stimulus for measuring hearing aid gain is recommended.
Keidser
Gitte
G
National Acoustic Laboratories, Chatswood, NSW 2067, Australia. gitte.keidser@nal.gov.au
Dillon
Harvey
H
Convery
Elizabeth
E
O'Brien
Anna
A
D000161:Acoustic Stimulation / Q000379:methods*; D006310:Hearing Aids; D034381:Hearing Loss / Q000175:diagnosis* / Q000628:therapy*; D006801:Humans; D017711:Nonlinear Dynamics; D010700:Phonetics; D013018:Sound Spectrography; D013069:Speech Reception Threshold Test