Description and Validation of an LDL Procedure Designed to Select SSPLSO

Hawkins, David B.; Walden, Brian E.; Montgomery, Allen A.; Prosek, Robert A.

doi:10.1097/00003446-198706000-00006

Cited by 95 publications

(69 citation statements)

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“…The UCLs were measured with an ascending approach in 5 dB steps (2 or 2.5 dB for patients with very limited ranges), with verbal responses from the following written list: very soft, soft, comfortable but slightly soft, comfortable, comfortable but slightly loud, loud but OK, uncomfortably loud, extremely uncomfortable, painfully loud (Hawkins et al, 1987). We considered UCL as the response 'uncomfortably loud' (or a higher category if they jumped to it).…”

Section: Measurement Proceduresmentioning

confidence: 99%

Hyperacusis: Case studies and evaluation of electronic loudness suppression devices as a treatment approach

Sammeth

Preves

Brandy

2000

Scandinavian Audiology

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Hyperacusis, as defined here, is a relatively rare condition in which the patient, with or without hearing loss, experiences severe loudness discomfort to everyday environmental sound levels. The case studies of 14 patients with severe hyperacusis are described; all wore passive attenuators (earplugs and/or earmuffs) in an attempt to alleviate their discomfort, frequently producing communication difficulties. These subjects were fitted binaurally with experimental electronic loudness suppression devices housed in in-the-ear casings. The devices supplied low-level amplification followed by an extreme form of amplitude compression for moderate or high-level inputs in an attempt to reduce loudness discomfort without reducing audibility. Many of the subjects were found to function with a wider dynamic range with the active devices compared with passive attenuators or the unoccluded ear, and most reported that they benefited from the devices in at least some listening situations.

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Section: Measurement Proceduresmentioning

confidence: 99%

Hyperacusis: Case studies and evaluation of electronic loudness suppression devices as a treatment approach

Sammeth

Preves

Brandy

2000

Scandinavian Audiology

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“…Loudness Measures Categorical loudness ratings were used to estimate the most comfortable loudness levels of the vowels using a procedure described by Hawkins et al (1987). The …”

Section: Methodsmentioning

confidence: 99%

Temporal Intraspeech Masking of Plosive Bursts: Effects of Hearing Loss and Frequency Shaping

Mackersie

2007

J Speech Lang Hear Res

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PURPOSE-The purposes were 1) to compare masking of consonant bursts by adjacent vowels for listeners with and without hearing loss and 2) to determine the extent to which the "temporal intraspeech masking" can be reduced by a simulated hearing aid frequency-response shaping.METHOD-Fourteen adults with sensorineural hearing loss and six with normal hearing served as participants. Seven of the participants with hearing loss had flat/gradually sloping audiograms and seven had steeply sloping losses. Stimuli consisted of three consonant bursts (/t/, /p/, /k/) presented in isolation and in vowel-consonant-vowel combinations using the vowel /a/ with formant transition information removed. Normal-hearing listeners were tested using unfiltered stimuli. Listeners with hearing loss were tested using unfiltered stimuli and stimuli filtered to approximate a hearing aid frequency response prescribed by NAL-R. All listeners were tested under earphones at the most comfortable level for the vowel stimulus. Temporal intra-speech masking was quantified as the threshold shift produced by the adjacent vowels.RESULTS-Average intra-speech masking for listeners with steeply sloping hearing loss was significantly higher than that of normal-hearing listeners and those with flat/gradually sloping losses. Greater intra-speech masking was observed for /t/ and /p/ than for /k/. On average, frequency shaping significantly reduced the amount of intra-speech masking for listeners with steeply sloping hearing losses. Even with appropriate amplification/spectral shaping, however, temporal intra-speech masking remained greater than normal for several individuals.CONCLUSIONS-Finding suggest that some individuals with steeply sloping losses may need additional signal processing to supplement frequency-shaping in order to overcome the effect of temporal intra-speech masking.Intra-speech masking refers to the interference in the perception of speech cues by components of the speech signal itself. Intra-speech masking has typically been examined using synthesized vowels by measuring the perception of the second formant (F2) with reductions in the level of the first formant (F1) (Danaher et al., 1973;Van Tasell, 1980;Dorman et al., 1985a;Summers & Leek, 1997). Several of these studies demonstrated that attenuation of F1 can improve the audibility and discriminability of F2 transitions (Hannley & Dorman, 1983;Summers & Leek, 1997;Van Tasell, 1980). The studies noted above examined simultaneous intra-speech masking, that is, masking that occurs within simultaneous components of a speech signal. There is some evidence to suggest, however, that temporal masking between sequential speech cues can also influence perception. A number of studies have examined the influence of silence duration on the perception of intervocalic stop consonants in listeners with and without sensorineural hearing loss. Generally, as the silence duration is decreased, listeners become less accurate at labeling plosives on a voicing continuum (Lisker, 1957 (Cazals & Palis, 1...

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“…In particular, relatively high model outputs can produce electric currents greater than the comfortably loud level determined as described above. To ensure that no input sound could result in an uncomfortably loud sensation, the maximum loudness limiter in SpeL was adjusted using a procedure based on that of Hawkins et al (1987). Subjects listened to a noise with spectral and temporal characteristics similar to those of speech at an average level of 80 dBA (Dreschler et al, 2001).…”

Section: Methodsmentioning

confidence: 99%

Speech perception with a cochlear implant sound processor incorporating loudness models

McDermott

Sucher

McKay

2005

Acoustics Research Letters Online

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Recently, a new paradigm for processing sounds for cochlear implants has been described that aims to normalize loudness for complex signals, relative to normal acoustic loudness perception [McDermott et al., J. Acoust. Soc. Am. 114, 2190-2197(2003]. A first implementation of a sound processor based on this paradigm, called SpeL, has been evaluated with speech perception tests conducted in quiet and in noise. For the five participating subjects, the average scores from these tests for SpeL were very close to those for the conventional ACE scheme. However, audibility was improved by about 5 dB for SpeL compared with ACE.

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Description and Validation of an LDL Procedure Designed to Select SSPLSO

Cited by 95 publications

References 0 publications

Hyperacusis: Case studies and evaluation of electronic loudness suppression devices as a treatment approach

Hyperacusis: Case studies and evaluation of electronic loudness suppression devices as a treatment approach

Temporal Intraspeech Masking of Plosive Bursts: Effects of Hearing Loss and Frequency Shaping

Speech perception with a cochlear implant sound processor incorporating loudness models

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