Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 6

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1
Content available remote

Spatial Impulse Response Assessment in Room Acoustics Auralization

100%
Małecki P.
Acta Physica Polonica A
|
2015
|
vol. 128
|
issue 1A
A-17-A-21
EN
Ambisonic impulse responses (also known as the Spatial Impulse Responses) are getting more and more popular in many applications of room acoustics. Measuring, modeling, synthesizing, or simulating acoustics of interiors with emphasize on their spatial features are the examples. The present article shows a methodology of room acoustics auralization assessment using the ambisonics technology. A case study is shown for room acoustics capturing (measuring the Spatial Impulse Response) and reproducing with the use of a multi-channel sound system. An discussion and considerations about fidelity of such reconstruction is provided. Furthermore, a quantitative measure for the auralization quality is proposed. Also on-site experiments are described and their results presented to illustrate the theoretical considerations and outline options for future work. Obtained results show that most of the proposed quality factors meet the assumptions. After possible future modifications and additional research, the proposed methods could be used in evaluation of room acoustic auralization.
2
Content available remote

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
|
2011
|
vol. 119
|
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.
3
Content available remote

On the Management of Direct and Reflected Sounds in the 5.0 Surround Sound Reproduction System

51%
Kleczkowski P., Król A., Małecki P.
Acta Physica Polonica A
|
2015
|
vol. 128
|
issue 1A
A-11-A-16
EN
Direct and ambient sounds are usually reproduced through the same loudspeakers. In multichannel systems, with the use of anechoic recordings and auralization techniques it is possible to separate these sound components so that they are reproduced via different loudspeakers. Four basic options of management of direct and reflected sounds were investigated in a perceptual experiment. One sound source and the standard 5.0 surround sound system was used. It was found that listeners consistently preferred sound reproduction with direct sound radiated from only one loudspeaker.
4
Content available remote

Localization of the Sound Source with the Use of the First-order Ambisconic Microphone

51%
Wierzbicki J., Małecki P., Wiciak J.
Acta Physica Polonica A
|
2013
|
vol. 123
|
issue 6
1114-1117
EN
The paper presents results of determination of sound wave direction based on signals from first-order ambisonic microphone. The experiment consisted in recording the test signals with the SoundField microphone positioned in the axis of the turntable in the anechoic chamber. The spherical coordinates of the sound intensity vector were calculated with use of three different conceptual and numerical approaches and were compared to actual values resulting from the geometry of the system. Accuracy of the localization of the sound source depending on the frequencies and the method for determination of the spherical coordinates as well as on the time constant and the parameters of the signal recording was presented. The obtained results show the effectiveness of the calculation methods used for localization of the sound source.
5
Content available remote

Subjective Assessment of the Multi-Channel Auralizations

51%
Małecki P., Wiciak J., Wierzbicki J.
Acta Physica Polonica A
|
2012
|
vol. 121
|
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.
6
Content available remote

Quietness in the Soundscape of the Białowieża National Park

39%
Wiciak J., Mleczko D., Ozga A., Wszołek G., Wierzbicki J., Piechowicz J., Małecki P.
Acta Physica Polonica A
|
2015
|
vol. 128
|
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.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.