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1
Content available remote

Influence of Modulation Detection Threshold on Speech Intelligibility

100%
Leo K.
Acta Physica Polonica A
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2011
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vol. 119
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issue 6A
1023-1026
EN
Speech intelligibility in classrooms and lecture halls was investigated. Acoustical measurements in the rooms have been performed, with special concern about 125 ms of early decay phenomenon. Weighting function of early reflections relative energy derived from modulation threshold and speech modulation spectrum of signal is proposed.
2
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Speech Intelligibility Measurements in Auditorium

100%
Leo K.
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issue 1
110-114
EN
Speech intelligibility was measured in Auditorium Novum on Technical University of Gdansk (seating capacity 408, volume 3300 m^{3}). Articulation tests were conducted; STI and Early Decay Time EDT coefficients were measured. Negative noise contribution to speech intelligibility was taken into account. Subjective measurements and objective tests reveal high speech intelligibility at most seats in auditorium. Correlation was found between spatial differences in responses to articulation tests and EDT for low frequencies divided by EDT for high frequencies.
3
Content available remote

Subjective Evaluation of Classroom Acoustics by Teenagers vs. Reverberation Time

100%
Leśna P., Skrodzka E.
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issue 1
115-117
EN
A questionnaire was developed to evaluate acoustics in classrooms. The group of 279 pupils from 7 schools in age from 11 till 17 years were tested. The subjective evaluation was accompanied by objective measurements of reverberation time in 11 classrooms. The questionnaire was based on five point differential scales and consisted of six questions about acoustic comfort, teacher voice clarity, speech comprehension, evaluation of different noise sources intensity, annoyance and consequences of noise in the classroom. The results of statistical analysis of subjective answers and physical measurements of reverberation time were correlated. After analysis it was found that clarity of teacher voice and speech comprehension scores lowered for increasing reverberation time and was not statistically significant. Acoustic comfort score was also lower for increasing reverberation time but only in a group of pupils older than 12 years. For children under 12 years the results of questionnaire's analysis were not so clear as for older pupils.
4
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The Influence of the Measurement Chain on the Impulse Response of a Reverberation Room and Its Application Listening Tests

51%
Małecki P., Zastawnik M., Wiciak J., Kamisiński T.
Acta Physica Polonica A
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2011
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vol. 119
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issue 6A
1027-1030
EN
There are many objective parameters of the room impulse response which we can calculate that describe its acoustic field. The room impulse response can also be used to provide listening tests using the convolution technique. The aim of this work is to consider the influence of the impulse response measurement chain on objective numerical parameters and on the subjective perception of listeners. This article shows the impulse response measurement results obtained in the reverberation room using not only commonly known measurement chain elements but other elements, too. Standard components such as an omni-directional source and measurement microphone, as well as a consumer active loudspeaker and various audio recording stereo microphone pairs were used. The results are compared taking into consideration calculated numerical parameters and the application of calculated impulse responses to subjective listening tests. To determine the applicability of impulse responses to psychoacoustic listening tests, a preliminary listening test using headphones was carried out on a selected group of listeners. The audio test material consisted of samples of choral music and speech recorded in an anechoic room and convolved with previously analyzed impulse responses. This article shows how big the differences of subjective listener feelings are for different acoustic transducers.
5
Content available remote

Investigation of Auditory Objects Caused by Directional Sound Sources in Rooms

51%
Zotter F., Frank M.
Acta Physica Polonica A
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2015
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vol. 128
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issue 1A
A-5-A-10
EN
The auditory impression of sound sources is strongly influenced by the room, which, e.g., determines the apparent source width. What is more, typical sources are not omnidirectional, which also makes their orientation a strong influence. This influence, however, has only been investigated a little, although it can even change the perceived location of the source. To provide more insight, we performed extensive listening experiments inside our anechoic laboratory that is equipped with a 24-channel loudspeaker playback to simulate both the directional source and the room. The directional source is described by two frequency-independent 3rd order directivity designs in 36 different orientations, and the room is simulated by the two-dimensional 1st and 2nd order image source method. Results of the experiment indicate that, in most cases, the auditory location can be determined by the loudest unmasked acoustic reflection path. This allows to explain the primary direction perceived with an astonishingly simple model including precedence effects.
6
Content available remote

Evaluation of Acoustical Properties of an Auditorium after a Modernisation Program

51%
Czerwiński A., Dziechciowski Z.
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vol. 125
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issue 4A
A-71-A-76
EN
This study summarises and compares the measurement results of acoustical properties of an auditorium located on the campus of the Faculty of Mechanical Engineering at the Cracow University of Technology. The auditorium was thoroughly modernised and its acoustic features adapted. Measurements of the room acoustics were first taken prior to the modernisation program and were repeated after completion of the modernisation works. Evaluation of auditorium acoustics was based on the following parameters: reverberation time, early/late energy ratio (clarity) C_{50}, early decay time, speech intelligibility indices, and uniformity of sound distribution. The effect of the modernisation program on levels of those parameters are explored and conformity to the design objectives is analysed.
7
Content available remote

Subjective Assessment of the Multi-Channel Auralizations

51%
Małecki P., Wiciak J., Wierzbicki J.
Acta Physica Polonica A
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2012
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vol. 121
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issue 1A
A-110-A-114
EN
The article presents the course and the results of an experiment, which aimed at the subjective assessment of the multi-channel impulse responses. The assessment was conducted considering the usefulness of the received responses for the conducting operation of the digital convolution. The resulting sound material is generated for the simulation of the characteristics of the room. In a medium-sized, rectangular reverberation room (74 m^3) a number of measurements of impulse responses were conducted with the use of multi-channel microphone techniques and with the use of SoundField type microphone. In identical conditions the raw sound material was recorded (in conditions of free field). Next, the convolution was performed between the raw material and the recorded impulse responses. The group of experts, whose members had at least 5 years of experience in the field of sound engineering, was subjected to the psychoacoustic tests aiming at comparison of the sound materials achieved in the convolution and in the recording.
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