Hearing Aids and Hearing Impairment

Edwards, Brent

doi:10.1007/0-387-21575-1_7

Cited by 38 publications

(33 citation statements)

References 270 publications

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“…For example, it is necessary to characterize how changes in sound intensity (provided by a hearing aid) are represented in the CAS. When sound is processed through a hearing aid the amplitude and spectral characteristics of the signal are modified [for a review see Dillon, 2001;Edwards, 2004;Kuk, 2002;Souza, 2002]. To date, we know very little about the effect of these modifications on the physiologic encoding of sound.…”

Section: Introductionmentioning

confidence: 99%

Effects of Hearing Aid Amplification and Stimulus Intensity on Cortical Auditory Evoked Potentials

et al. 2007

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Hearing aid amplification can be used as a model for studying the effects of auditory stimulation on the central auditory system (CAS). We examined the effects of stimulus presentation level on the physiological detection of sound in unaided and aided conditions. P1, N1, P2, and N2 cortical evoked potentials were recorded in sound field from 13 normal-hearing young adults in response to a 1000-Hz tone presented at seven stimulus intensity levels. As expected, peak amplitudes increased and peak latencies decreased with increasing intensity for unaided and aided conditions. However, there was no significant effect of amplification on latencies or amplitudes. Taken together, these results demonstrate that 20 dB of hearing aid gain affects neural responses differently than 20 dB of stimulus intensity change. Hearing aid signal processing is discussed as a possible contributor to these results. This study demonstrates (1) the importance of controlling for stimulus intensity when evoking responses in aided conditions, and (2) the need to better understand the interaction between the hearing aid and the CAS.

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Section: Introductionmentioning

confidence: 99%

Effects of Hearing Aid Amplification and Stimulus Intensity on Cortical Auditory Evoked Potentials

et al. 2007

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“…This setup suggests that the frequency response of the adaptive filter should always be close to the frequency response of the acoustical feedback path so as to continuously and adaptively cancel the feedback signal. Now the problem is how to adaptively update the coefficients of the adaptive FIR filter, which includes the following two key issues [1], [2], [5].…”

Section: Feedback Cancellationmentioning

confidence: 99%

“…The fourth area is devoted to expanding hearing aid technology into devices that are also able to perform other functions, such as mobile phones and music players. In this area, issues such as echo cancellation, boneconductive microphones, and wireless voice link are of interest [1], [2]. Because of the limitations imposed by the hardware requirements, computational speed, power consumption, and other practical factors, the development and implementation of signal processing techniques for digital hearing aids has been a challenging and active research area over the past decade.…”

mentioning

confidence: 99%

Recent developments in signal processing for digital hearing aids

Luo¹,

Nehorai

2006

IEEE Signal Process. Mag.

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“…Vowel perception generally poses little difficulty for hearing-impaired listeners due partially to the fact that the level of the vowels is much greater than the level of the consonants (Owens et al, 1968;Edwards, 2004). In contrast, consonant perception is considerably much more challenging for hearing-impaired listeners (e.g., Owens et al, 1972).…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, consonant perception is considerably much more challenging for hearing-impaired listeners (e.g., Owens et al, 1972). Among other factors, consonant perception by hearingimpaired (HI) listeners seems to be affected by multiband compression (Yund and Buckles, 1995;Edwards, 2004), which reduces spectral contrast, and the degree of hearing loss, particularly in the high-frequency regions where some consonants (e.g., /s/, /t/) have prominent energy. This reduced spectral contrast combined with the hearing loss clearly influences the audibility of consonants (Owens et al, 1972;Turner and Robb, 1987).…”

Section: Introductionmentioning

confidence: 99%

The effects of selective consonant amplification on sentence recognition in noise by hearing-impaired listeners

Saripella

Loizou

Thibodeau³

et al. 2011

The Journal of the Acoustical Society of America

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Weak consonants (e.g., stops) are more susceptible to noise than vowels, owing partially to their lower intensity. This raises the question whether hearing-impaired (HI) listeners are able to perceive (and utilize effectively) the high-frequency cues present in consonants. To answer this question, HI listeners were presented with clean (noise absent) weak consonants in otherwise noisecorrupted sentences. Results indicated that HI listeners received significant benefit in intelligibility (4 dB decrease in speech reception threshold) when they had access to clean consonant information. At extremely low signal-to-noise ratio (SNR) levels, however, HI listeners received only 64% of the benefit obtained by normal-hearing listeners. This lack of equitable benefit was investigated in Experiment 2 by testing the hypothesis that the high-frequency cues present in consonants were not audible to HI listeners. This was tested by selectively amplifying the noisy consonants while leaving the noisy sonorant sounds (e.g., vowels) unaltered. Listening tests indicated small ($10%), but statistically significant, improvements in intelligibility at low SNR conditions when the consonants were amplified in the high-frequency region. Selective consonant amplification provided reliable low-frequency acoustic landmarks that in turn facilitated a better lexical segmentation of the speech stream and contributed to the small improvement in intelligibility.

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Hearing Aids and Hearing Impairment

Cited by 38 publications

References 270 publications

Effects of Hearing Aid Amplification and Stimulus Intensity on Cortical Auditory Evoked Potentials

Effects of Hearing Aid Amplification and Stimulus Intensity on Cortical Auditory Evoked Potentials

Recent developments in signal processing for digital hearing aids

The effects of selective consonant amplification on sentence recognition in noise by hearing-impaired listeners

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