Wyniki wyszukiwania - BazTech

1

Badanie wpływu zmian dynamiki sygnałów muzycznych na ocenę barwy dźwięku kodowanego percepcyjnie

Kin M. J., Chojnacka J.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2016

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nr 6

344--347, CD

PL

W pracy przedstawiono wyniki badań nad wpływem kodowania percepcyjnego na zmianę barwę dźwięku oraz jego głośność. Badania wykonano w standardzie MPEG-2 Audio Layer przy różnych przepływnościach oraz różnych parametrach kompresji dynamiki. Wyniki badań mogą być przydatne w procesie przygotowania materiału muzycznego, aby redukcja objętości informacji nie wpłynęła na odbiór wrażeń estetycznych.

EN

Paper presents the results of experiments on timbre perception of perceptually coded musical signals for different bit-rates and various set of parameters describing the dynamic domain. The results may help in the preparation a musical material in the way that all aesthetical aspects of music remain unchanged under perceptual coding.

2

Perception of Changes in Spectrum and Envelope of Musical Signals vs Auditory Fatigue

Kin M. J., Dobrucki A.

Archives of Acoustics

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2016

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Vol. 41, No. 2

323--330

EN

The paper presents results of research on an influence of listening fatigue on the detection of changes in spectrum and envelope of musical samples. The experiment was carried out under conditions which normally exist in a studio or on the stage when sound material is recorded and/or mixed. The equivalent level of presented sound samples is usually 90 dB and this is an average value of sound level existing in control room at various recording activities. Such musical material may be treated as a noise so Temporary Threshold Shift phenomenon may occur after several sessions and this may lead to a listening fatigue effect. Fourteen subjects participated in the first part of the experiment and all of them have the normal hearing thresholds. The stimuli contained the musical material with introduced changes in sound spectrum up to ±6 dB in low (100 Hz), middle (1 kHz) and high frequency (10 kHz) octave bands. In the second part of research five subjects listened to musical samples with introduced envelope changes up to ±6 dB in interval of 1 s. The time of loud music exposure was 60, 90 and 120 minutes and this material was completely different from the tested samples. It turned out that listening to the music with an Leq = 90 dB for 1 hour influences the hearing thresholds for middle frequency region (about 1–2 kHz) and this has been reflected in a perception of spectral changes. The perceived peaks/notches of 3 dB have the detection ability at 70% and the changes of low and high ranges of spectrum were perceived at the similar level. After the longer exposure, the thresholds shifted up to 4.5 dB for the all investigated stimuli. It has been also found that hearing fatigue after 1 hour of a listening influences the perception of envelope which gets worse of 2 dB in comparison to the fresh-ear listening. When time of listening to the loud music increases, the changes in envelopes which can be detected rise to the value of 6 dB after 90-minutes exposure and it does not increase with further prolongation of listening time.

3

Przestrzeń w architekturze, przestrzeń architektury

Szymański W., Kania B., Kin M. J.

Architectus

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2015

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Nr 4(44)

83--92

PL

W pracy omówiono relacje architektury, pojmowanej jako jeden z elementów kultury, z innymi obiektami przestrzeni społecznej. Podano przykłady zjawisk istniejących we współczesnej kulturze i ich związków z architekturą, którą rozpatrywano jako obraz rzeczywistości społecznej i technologicznej. Przedstawiając wiele wybranych zagadnień, wskazano zakresy rozważań, w których można i należałoby niezmiennie prowadzić procesy poznawania dotyczące tego, co określa przestrzeń architektury. Procesowi poznawczemu musi towarzyszyć wątpliwość. Jest ona warunkiem niezbędnym do stawiania pytań. A tylko wtedy, gdy zadajemy pytania, możemy uzyskiwać odpowiedzi. Są to niezbędne warunki każdego postępu. Polemiczny charakter artykułu, zdaniem autorów, spełnia ten postulat.

EN

The paper presents the relations between architecture as one of the elements of culture and various objects in the social sphere. Examples of contemporary existing phenomena and their connections with architecture considered as a reflection of social and technical realities are described. Presenting many selected problems the range of considerations has been shown, in which it is possible and obligatory to carry out cognitive processes referring to what determines architectural space. In the cognitive process the existence of doubts is a necessary condition. It is a necessary requirement for asking questions. And only when we ask questions we may obtain answers. These are necessary conditions of every development. The polemical character of this paper, according to the authors, fulfills this demand.

4

Preliminary Study on the Influence of Headphones for Listening Music on Hearing Loss of Young People

Dobrucki A. B., Kin M. J., Kruk B.

Archives of Acoustics

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2013

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Vol. 38, No. 3

383--387

EN

The paper presents results of hearing loss measurements provided for 81 young people (from 16 to 25 years old). The main aim of the work was to find the influence of headphones of the types used (closed, semi-open, open and in-ear) on the hearing losses. The first part of the research was to answer questions about the influence of: time of listening, loudness of music, other noise exposures as well as the type of the headphones used. It turned out that all factors mentioned above influence thresholds of hearing but the found dependencies are not explicit. The greatest hearing losses were observed for people who work as sound reinforcement engineers and, moreover, no influence of the headphone types was found for them. It turned out that the use of in-ear headphones causes the greatest hearing losses for some subjects (thresholds shifted up to about 20 dB HL at 4 kHz). The daily time of a listening also affected the hearing thresholds. It was found that for users of in-ear and close headphones, an average time of musical exposure of three hours causes the hearing loss of 10-15 dB HL at higher frequencies. The use of open as well as semi-open headphones has no influence on the hearing damage. Thus it would be stated that these kinds are safety in use. Almost 15% of the investigated young people have their thresholds shifted up at higher frequencies, particularly at 4 kHz, which means that they have the first symptoms of a permanent hearing damage.

5

Conversion of stereo recording to 5.1 format using head-related transfer functions

Hen P., Kin M. J., Plaskota P.

Archives of Acoustics

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2008

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Vol. 33, No. 1

7-10

EN

The paper presents the conversion of stereo recordings into multi-channel format 5.1 by means of the HRTF filtering. An algorithm of additional channels preparation (a central one and two surround ones) using various filters created on the base of HRTF was tested. The filter bank was prepared on the basis of impulse responses given by users. The algorithm uses the impulse response convolution of the filter with a processed signal. The convolution is realized in frequency domain, i.e. Fourier transforms of the processed signals are multiplied. Recordings created in such way were tested for the features of sound color distortion and spaciousness of the audio-scene in frontal plane.

6

Wykorzystanie Head-Related Transfer Functions do auralizacji nagrań dźwiękowych

Plaskota P., Wasilewski M., Kin M.J.

Prace Naukowe Instytutu Telekomunikacji i Akustyki Politechniki Wrocławskiej. Konferencje

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2003

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Vol. 84, nr 28

17-22

EN

In the paper the concept of HRTF application in the recording process is described. The way of data-acquisition for data-base containing information for 3-D auralization is shown. The measurement procedure, data-base creation and practical application are presented.

7

Techniczne aspekty nagrań muzycznych dokonywanych we wnętrzach sakralnych

Kin M.J., Mielczarek A.

Prace Naukowe Instytutu Telekomunikacji i Akustyki Politechniki Wrocławskiej. Konferencje

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2003

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Vol. 84, nr 28

34-40

EN

This paper presents the basic principles of musical recording in churches. The main technical aspects and their relations to perception of sound are described. The case of microphone setup during orchestral recordings known as "the zone microphones" is an example of using psychoacoustic phenomena in creation of sound image.

8

Przestrzenne atrybuty dźwięku i ich zachowanie podczas rejestracji nagrań w naturalnych wnętrzach

Mielczarek A., Kin M.J.

Prace Naukowe Instytutu Telekomunikacji i Akustyki Politechniki Wrocławskiej. Konferencje

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2003

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Vol. 84, nr 28

29-34

EN

The main aspects of spatial attributes of sound important during recording process are described in the paper. Such features as spaciousness, liveness and clarity of real and recorded sound are discussed. Connections between room acoustic parameters and sound image are presented.

9

Wpływ kształtu i sposobu pobudzania piszczałki organowej na widmo dźwięku

Poremski T., Kin M.J.

Prace Naukowe Instytutu Telekomunikacji i Akustyki Politechniki Wrocławskiej. Konferencje

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2001

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Vol. 83, nr 27

537-542

EN

In the paper, the research on the organ pipe is described. Some principles and tales dependent on the constructional feature and based on the results of analysis are presented. These rules may be useful for organ designers as well as the researchers looking for particular features of the organ sound.

10

Lokalizacja źródeł dźwięku w rożnych warunkach maskowania

Kin M.J., Teteruk M.

Prace Naukowe Instytutu Telekomunikacji i Akustyki Politechniki Wrocławskiej. Konferencje

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2001

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Vol. 83, nr 27

83-86

EN

This paper presents the results of an experiment on the localization of pure tone pulse with the different angles of masking noise. The experiment was performed by ten subjects and results showed that for the source placed in the center the localization accuracy is the smallest and one-sided exposure is the most accurate direction in that way of presentation. However, the dependence of the localization accuracy is not monotonic and this fact has been discussed from psychological point of view.

11

Perception of mixed modulation for single components in harmonic complex for high modulating frequencies

Kin M. J., Dobrucki A. B.

Archives of Acoustics

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1998

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Vol. 23, no. 3

379-390

EN

Results and problems of perception of mixed modulation in a harmonic multitone are discussed. The experimental research was done for higher modulating frequencies (70 and 200Hz) and a 5-harmonics complex with fundamental frequency of 256Hz. The results indicated that for a modulating frequency of 70Hz, the perception of frequency modulation in the presence of the threshold values of the amplitude modulation is different from the perception of amplitude modulation in the presence of the threshold values of the frequency modulation. This means clearly that there are two mechanisms of the perception for these kinds of modulation.