Abstract
This study examined the alterations in nonlinear distortion in hearing aids that resulted from normal battery-voltage variations over useable battery life. New hearing aids of several types were selected for study. Initially, the gain of each instrument was adjusted to a level 6 dB below maximum at 1000 Hz. The gain was readjusted to this value for all subsequent measurements until battery voltage dropped below a level adequate to maintain that gain, even at a maximum setting. Nonlinear distortion was recorded at 500, 600, 700, 900, and 1250 Hz, utilizing 70-dB-SPL (sound-pressure level) input signals. The hearing aids were operated for 8 h daily and distortion measurements were made at regular intervals until gain dropped below −10 dB reference the initial test value. The results indicate that for some hearing-aid/battery-type combinations disproportionate increases in distortion accompany decreases in battery life. Results are considered both as a function of battery life and voltage. Implications of these findings are discussed.
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