W. Wiktor Jedrzejczak

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Clicks and a set of tone bursts covering the same frequency band were applied as a stimuli evoking otoacoustic emissions (OAE). Recorded otoacoustic emissions were decomposed into the basic waveforms by means of high-resolution adaptive time-frequency approximation method based on the matching pursuit algorithm. The method allows for description of the(More)
Transiently evoked otoacoustic emissions (TEOAE) were measured from 124 ears from two subject groups: healthy subjects (62 ears), and workers (62 ears) exposed to noise of jet engines. The recordings were analyzed using the method of adaptive approximations based on a matching pursuit (MP) algorithm. The method allows for description of the signal(More)
OBJECTIVE The purpose of the study was to investigate the properties of otoacoustic emissions (OAEs) evoked by chirp stimuli and compare them with standard click-evoked OAEs. Differences between evoked OAEs in children with and without spontaneous otoacoustic emissions (SOAEs) were also assessed. METHODS OAEs were first recorded from 54 children (age 4-10(More)
A synchronized spontaneous otoacoustic emission paradigm was used to measure the response in time intervals of 80 ms following a click stimulus. The responses obtained were decomposed into basic waveforms by means of adaptive approximations using a matching pursuit algorithm. High-resolution time-frequency distributions of signal energy were calculated and(More)
OBJECTIVE The aim of this study was to assess the diagnostic value of click-evoked otoacoustic emissions (CEOAEs) and tone-burst evoked otoacoustic emissions (TBOAEs) in identifying the residual hearing of subjects with partial deafness (PD)--a condition in which subjects have normal thresholds at low frequencies and severe-to-profound sensorineural hearing(More)
Transiently evoked otoacoustic emissions (TEOAEs) are normally modeled as the sum of asymmetric waveforms. However, some previous studies of TEOAEs used time-frequency (TF) methods to decompose the signals into symmetric waveforms. This approach was justified mainly as a means to reduce the complexity of the calculations. The present study extended the(More)
Transiently evoked otoacoustic emissions (TEOAEs) were recorded from full-term and preterm neonates. The responses were decomposed, by means of an adaptive approximation method, into waveforms of defined frequencies, amplitudes, latencies and time spans. Statistically significant differences in the latency values were found between the tested groups.(More)
A number of single-frequency resonant modes in click evoked otoacoustic emissions (OAEs) was investigated. The OAE modes were identified by means of an adaptive approximation method based on the matching pursuit (MP) algorithm. The signals were decomposed into basic waveforms coming from a very large and redundant dictionary of Gabor functions. The study(More)
BACKGROUND The objective of the study was the evaluation and comparison of hearing threshold values extrapolated from Auditory Steady State Responses, using 2 commercial systems and the estimation of correction factors applicable to the ASSR data. MATERIAL/METHODS One hundred ten subjects participated to the study. All subjects were initially examined(More)
Otoacoustic emission (OAE) data recorded for tone bursts presented separately and as a two-tone burst complex, that had been reported previously [Yoshikawa, H., Smurzynski, J., Probst R., 2000. Suppression of tone burst evoked otoacoustic emissions in relation to frequency separation. Hear. Res. 148, 95-106], were re-processed using the method of adaptive(More)