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1
Content available remote Profesor Marek Kwiek. Uczony, nauczyciel i organizator
Łabowski M., Hojan E., Ozimek E.
Postępy Fizyki
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2013
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T. 64, z. 3-6
134--138
2
Content available remote Perception of fast time fluctuations in the sound level by persons with a cochlear implant
Kwiatkowski R., Hojan E., Szyfter W., Furmann A., Hojan-Jezierska D.
Archives of Acoustics
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2008
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Vol. 33, No. 4
423-434
EN
The paper presents results of scaling of loudness changes of natural sounds for persons with a cochlear implant by the so-called NSLE method. The possibilities of the use of this method of loudness scaling of natural sounds in the rehabilitation of persons with a cochlear implant have been analysed.
3
Content available remote A natural sound loudness estimation method as a perspective tool for hearing aid fitting in patients with dead cochlear regions
Hojan-Jezierska D., Skrodzka E., Hojan E.
Archives of Acoustics
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2007
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Vol. 32, No. 3
511--516
EN
Hearing aids fitted with the use of classical methods (POGO, NAL, Berger ect.) often do not bring the expected benefit to hearing impaired people with “dead regions”, (DRs). For such patients we propose an alternative method of hearing aids fitting, based on perception of natural sounds – The Natural Sounds Loudness Estimation (NSLE) method. Our aim was to check whether patients with such a complicated hearing loss were able to follow loudness changes in the sound material. Four persons (seven ears) with diagnosed DRs were examined. Only one of them was not able to perform the loudness estimation test with satisfactory precision (calculated as a correlation coefficient between sound pressure changes on an original sound track and subjectively perceived changes in loudness). Next, the parameters necessary to proper hearing aid fitting were calculated using the NSLE. Estimated insertion gains (IGs) were generally lower than those predicted by three classical methods used for comparison. Our conclusion is that the NSLE method may be a good option for hearing aids fitting in the case of people with DRs.
4
Content available remote Vibroacoustic investigation of a batter head of a snare drum
Skrodzka E. B., Hojan E., Proksza R.
Archives of Acoustics
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2006
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Vol. 31, No. 3
289-297
EN
The modal analysis of a batter head of a snare drum and measurements of the instrument's sound spectrum have been performed. The modal analysis results is comparable to the scarce literature reports. The analysis of the frequency maxima of the sound spectrum revealed significant discrepancies between the modal frequencies and those of the spectral peaks. It has been shown that the lowest mode (0, 1) is the strongest mode of radiation only for central excitation. For non-central excitation, the frequencies of spectral peaks differ significantly from the modal frequencies. It has been found that the batter head was not necessary the most strongly radiating element of the drum system and that the influence of other elements (the snare drum, the shell, the snares) are also very important as far as sound impression is concerned.
5
Content available remote Investigations on the angle of directional hearing acuity
Niewiarowicz M., Czajka J., Hojan E.
Archives of Acoustics
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2005
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Vol. 30, No. 2
147-157
EN
This article presents results of investigations of the angle of directional hearing acuity (ADHA) as a measure of the spatial hearing ability. A modified method proposed by Zakrzewski has been used -- ADHA values have been determined for azimuths in the horizontal plane at the height of the listener's head. Application of different acoustic signals - sinusoidal signals (pure tones), 1/3 octave noise, and amplitude modulated 1/3 octave noise, helped to reveal significant differences in ADHA values for individual signal types. A better localization of the sound source for noise type signals than those for sinusoidal signals has been found. Furthermore, smaller differences in the perception of noise signals compared with differences in the perception of sinusoidal signals were recorded for individual listeners. The best localization was stated for the azimuth 0° and the worst for the azimuth 90° and 270°.
6
Content available remote Investigations into speech intelligibility in the presence of different masking noises for hearing aids with variable attack and release times
Hojan E., Fastl H., Malenda J., Hojan-Jezierska D.
Archives of Acoustics
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2005
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Vol. 30, No. 2
159-171
EN
People with hearing impairments experience a reduction in speech intelligibility in noisy surroundings. The extent of this reduction depends on the degree of impairment in the temporal resolution of the patient's ear, too. The change of the speech intelligibility of hearing-impaired people was investigated in the presence of different masking noises, especially when using hearing aids with adjustable attack (AT) and release (RT) times within same frequency bands.
7
Content available remote Attributes of desirable acoustic environments in some rooms
Berglund B., Hojan E., Furmann A., Sworek K.
Archives of Acoustics
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2002
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Vol. 27, no. 3
249-255
EN
Normal hearing native Polish speaking subjects were asked to choose attributes of a desirable acoustic environment, which were presented in a list. The subjects were asked to describe the attributes that would be desirable while listening to a lecture hall, reading a book in a living room and listening to a musical performance in concert hall. Results indicate that the methods used to derive the attributes is valid, that women apply more and slightly different attributes then men and some attributes are uniformly used across the environments tested.
8
Content available Subjective evaluation of sound emitted by a loudspeaker system in correlation with its steady-state and transient responses
Niewiarowicz M., Furmann A., Hojan E., Perz P.
Archives of Acoustics
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1998
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Vol. 23, no. 1
39--49
EN
Objective parameters of a loudspeaker system, which describe its transmission properties in a transient- and steady-state, have been determined. These parameters have been related to the attributes of the sound perception space (fullness, clearness, sharpness, spaciousness, loudness, lack of distortions) with respect to the overall subjective evaluation and the parametric one. A good correlation between sharpness, fullness, spaciousness and selected objective parameters have been obtained. An influence of the test signal on the results of the subjective evaluation was also discovered.
9
Content available remote Optimization of the duration of an echogram resulting from computer simulation of the acoustic properties of a room
Gołębiewski R., Hojan E., Wojtczak M., Pękala P.
Archives of Acoustics
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1998
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Vol. 23, no. 3
353-362
EN
The authors of this paper investigated the ways to decrease the time of calculating an echogram in the computer simulation of the distribution of the sound field in a room. The authors emphasize the existence of a limiting moment tst up to which the simulation must be completed. The remaining part of the echogram may be treated as a stochastic amplitude (temporal distribution). The authors related the moment tst to the reverberation time RT and the early decay time, EDT, of a room.
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