Biomedical subjects

P E Lyregaard

Publications and source records attributed to P E Lyregaard.

4 recordsLinked to original sources

PubMed2000

Fitting hearing aids to first-time users.

Clinical experience indicates that first-time hearing aid users prefer less gain and lower maximum output levels than experienced users. This hypothesis was tested on 20 subjects being fitted with their first aids. The study was double blinded by using a programmable hearing aid, set to either the standard setting according to the manufacturer's software or to reduced gain and maximum output. Half of the subjects started with one hearing aid and half with the other, changing to the other hearing aid after 3 days trial with each setting. At the end of the study, subjects stated preference in specified situations and overall. No significant differences in APHAB, sound quality, estimated communication ability or perceived loudness scores were seen for the two settings. Nine subjects preferred the standard setting, seven the reduced setting and four were undecided. No correlation could be found between preference and audiological variables.

Acoustic Stimulation↗

PubMed1998

Procedure for clinical testing of hearing aids.

In 1996, the Danish audiological clinics and hearing aid manufacturers jointly developed a clinical procedure for testing novel hearing aids in a clinical setting. This endeavour cane about because it was being acknowledged that clinical testing of hearing aids was likely to become more prominent as a result of the more advanced signal processing schemes enabled by digital technology in particular. It was understood that future hearing aids would encompass a large variety of diverse features, and that a rigid and detailed test protocol would therefore be inappropriate. The procedure was therefore devised as a framework within which a test protocol can be developed, and constitutes the framework of good scientific and clinical practice.

Hearing Aids↗

PubMed1989

DANTALE: a new Danish speech material.

A new Danish speech material (DANTALE) for clinical and experimental speech audiometry is digitally recorded on compact disc (CD). The speech material is designed to meet present audiological requirements at Danish hearing centres. One channel of the CD contains the speech signals and the other a masking noise. The CD also contains various calibration signals recorded on both channels at the end of the CD. The speech material compromises: 1) Digit triplets for the measurement of speech reception threshold (SRT). 2) Lists of monosyllabic words for the measurement of discrimination score (DS) for adults, children and small children. The word lists for the adults are equalized with regard to important phonetic and "visual" elements and the word lists for the children consist of minimal pairs. 3) Continuous speech for the measurement of the most comfortable loudness level (MCL), assessment of hearing aid fitting and the like. The masking noise is an amplitude-modulated, speech-shaped noise signal, which is designed to simulate a 4-person speech babble in order to assess both the frequency selectivity and the temporal resolution. The speech material is described and the long-term power spectra and modulation spectra are given.

Audiometry, Speech↗

PubMed1982

Frequency selectivity and speech intelligibility in noise.

Poor speech intelligibility in noise is a major problem for persons afflicted by a sensorineural hearing loss, and this problem is generally not alleviated by a hearing aid. For a typical hearing loss the effective signal-to-noise ratio is degraded by 10 - 15 dB, predominantly due to impoverished frequency selectivity. The critical ratio averaged over speech frequencies is a convenient measure of this component of the auditory handicap. An attempt to improve speech intelligibility in noise through dichotic combfiltering was not successful.

Audiometry, Pure-Tone↗