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Normally Hearing Subjects Have No Advantage οf Better Audiograms in Listening Tasks

100%
Kleczkowski P., Pluta M.
Acta Physica Polonica A
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2012
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vol. 121
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issue 1A
A-115-A-119
EN
Some correlation has been found in literature between the amount of mild hearing impairment and lowering of performance in listening tasks. The relationship between measures of hearing acuity and performance in listening tasks in the population of normally hearing subjects has not found a solid evidence. In this work six one-parameter measures of hearing acuity based on audiograms, including three originally proposed by the authors, were used to investigate whether a relationship between those measures and listeners' performance existed. The results of six listening tests were investigated, three with speech, two with musical excerpts and one with everyday sounds. The results showed no correlation between hearing acuity and performance, with the exception of everyday sounds, where some correlation was found. No significant differences between the measures used were found.
2
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Frequency Discrimination in a Simultaneous Two-Tone Signal

100%
Kleczkowski P., Pluta M.
Acta Physica Polonica A
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2012
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vol. 121
|
issue 1A
A-120-A-125
EN
Discrimination of just noticeable change in pitch has been widely investigated. In contrast, works on discrimination of two simultaneous pitches produced by two tones have been scarce. In this work two methods were used to find the minimum frequency interval in a two-tone at which listeners perceive two distinct pitches. In the first, listeners tuned manually the frequency interval between components in a two-tone. In the second, the frequency interval between tones in a two-tone was switched between five different fixed values, and a pitch of a probe tone was compared with pitches in a two-tone. Both methods were used in two different groups of listeners, musicians and non-musicians. The first method yielded substantially narrower intervals. Both methods revealed that musicians were able to discriminate pitches at narrower intervals than non-musicians. The raw results of tests were evaluated by two approaches, one was based on fitting of the psychometric function and the other on statistical tests.
3
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Precise Psychoacoustic Correction Method Based on Calculation of JND Level

51%
Piotrowski Z.
Acta Physica Polonica A
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2009
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vol. 116
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issue 3
375-379
EN
This paper constitutes a proposal of a method of spectral shaping of the watermark signal without adjusting the interception point based directly on psychoacoustics of the human auditory system and the proposed calculation formula. The proposed calculation formula enables correction of watermark signal both as regards its spectrum shape and adjustment of watermark signal to the host's JND.
4
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Fidelity Estimation of Watermarked Audio Signals According to the ITU-R BS.1116-1 Standard

51%
Piotrowski Z., Gajewski P.
Acta Physica Polonica A
|
2012
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vol. 121
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issue 1A
A-82-A-85
EN
The paper describes the method that enables to measure acoustic fidelity of audio signals degraded with digital watermarks. Fidelity measurements of degraded acoustic signals is suitable for such applications as distinguishing whether the acoustic record is signed with a digital watermark (watermarked) or not as well as evaluation of the degradation degree affecting the host signal. The test of subjective assessment according to the recommendation ITU BS.1116-1 is the standard that served as the basis for implementation of a dedicated application within the Matlab environment and for development of the concept how to make this application available as an IP network service to enable assessment of degraded signal by a wider auditorium.
5
Content available remote

Quietness in the Soundscape of the Białowieża National Park

44%
Wiciak J., Mleczko D., Ozga A., Wszołek G., Wierzbicki J., Piechowicz J., Małecki P.
Acta Physica Polonica A
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2015
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vol. 128
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issue 1A
A-79-A-84
EN
The quietness, defined as the near or complete absence of sound, in the context of the natural environment protection, may be considered a state in which no undesired of foreign sounds occur, and, by analogy to noise, analyzed in two aspects: that pertaining to measurements and the subjective one. The article discusses the lowest levels of sounds recorded at night in the soundscape of the Białowieża Forest. Due to low levels of the examined sounds and the technical problems that occurred while the sounds were being measured and registered, the acoustic examination of the measurement set-up in an anechoic chamber has also been presented. The research is aimed at defining precisely the concept of quietness prevailing in the nature in the subjective aspect by determining both the range of levels and the characteristics of preferred sounds.
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