J Am Acad Audiol 2001; 12(03): 121-127
DOI: 10.1055/s-0042-1745588
Original Article

Preliminary Results with the AVR ImpaCt Frequency-Transposing Hearing Aid

Hugh J. McDermott
Co-operative Research Centre for Cochlear Implant and Hearing Aid Innovation and the Department of Otolaryngology, The University of Melbourne, East Melbourne, Australia
Michelle R. Knight
The Bionic Ear Institute, East Melbourne, Australia
› Author Affiliations


Currently, the only behind-the-ear hearing aid that provides a frequency transposition function is the ImpaCt DSR675, recently introduced by AVR Communications Ltd. of Israel. In tests with three hearing-impaired adults, the performance of the ImpaCt aid(s) was compared with that of each subject's own (nontransposing) hearing aids. Recognition of monosyllabic words and medial consonants did not differ significantly between the two types of aids. This suggests that the transposition function of the ImpaCt was not effective at providing these subjects with increased high-frequency speech information, at least for the programmable parameters applied in the experiments. However, the subjects' understanding of sentences in a competing noise was significantly poorer with the ImpaCt than with the subjects' own aids. In that test, the ImpaCt aids were programmed to attenuate parts of the noise. The decreased sentence recognition may have resulted from this program, which effectively reduced the bandwidth of the ImpaCt aids.

Abbreviations: AGC = automatic gain control, ANOVA = analysis of variance, CFE = Clinician Fitting Environment, CNC = consonant-vowel nucleus-consonant, DCB = dynamic consonant boost, FCVL = frequency compression for voiceless sounds, HPF = high-pass filter, LPF = low-pass filter, SNR = signal-to-noise ratio

Publication History

Article published online:
28 February 2022

© 2001. American Academy of Audiology. This article is published by Thieme.

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