PL
 |
EN
Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 10

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
Wyszukiwano:
w słowach kluczowych:  ambisonics
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Content available Ambisonics’ setup quality assessment through measurements and computations based on ITD and ILD functions using subbands and a Gammatone Filter Bank
100%
Dąbrowski M. , Skorupa J. , Raszewski W. , Głowiak M.
International Journal of Electronics and Telecommunications
|
2024
|
tom Vol. 70, No. 2
307--313
EN
Poznan Supercomputing and Networking Center (PSNC) developed an ambisonic installation and workflow as part of audio-visual 8K VR 360° immersive media experiments. This work aimed to investigate the quality of performance of the PSNC setup through both subjective tests as well as simulations providing objective parameters of interaural characteristics in a real-life scenario of PSNC studio. For the objective part, an algorithm for angle estimation has been proposed and computations were performed.
2
Content available Sound localisation definition in parametrically and non-parametrically decoded first-order ambisonic systems
100%
Majer J.
International Journal of Electronics and Telecommunications
|
2024
|
tom Vol. 70, No. 2
355--360
EN
This study assessed sound localisation definition in ambisonic systems using two-non-parametric and three parametric decoders, in a two-dimensional format. The sound samples were played back through eight loudspeakers arranged in a circle. The participants compared pairs of sound samples to determine which sample offered a more precise perception of the sound source’s location. The data analysis, using a Bradley-Terry probability mode, revealed that parametric decoders were preferred with a 60-83% probability. Among the parametric decoders, the COMPASS method, which utilizes the Multiple Signal Classification algorithm for sound source direction estimation, received the highest scores for sound localisation judgements.
3
Content available Reverberation divergence in VR applications
100%
Rolkowski P. , Odya P. , Mróz B.
International Journal of Electronics and Telecommunications
|
2024
|
tom Vol. 70, No. 2
373--380
EN
This project aimed to investigate the correlation between virtual reality (VR) imagery and ambisonic sound. With the increasing popularity of VR applications, understanding how sound is perceived in virtual environments is crucial for enhancing the immersiveness of the experience. In the experiment, participants were immersed in a virtual environment that replicated a concert hall. Their task was to assess the correspondence between sound scenes (which differed in reverberation times and their characteristics) and the observed invariant visual scene. The research was conducted using paired tests. Participants were asked to identify the sound scene they considered more closely matched the concert hall seen in the VR goggles for each pair. Each sound scene differed in the employed impulse response. All the impulse responses were recorded in real venues such as concert halls, auditoriums, churches, etc. To provide a realistic auditory experience, the sound scenes were processed using third-order ambisonics and decoded using binaural techniques with HRTFs. The virtual concert hall was generated using the Unreal Engine and was the same for all the tests. One of the major conclusions drawn from the conducted research was confirming the role of spatial sound in creating immersive VR experiences. The study demonstrated that appropriately matching spatial sound to the VR visual scene is essential for achieving complete immersion. Additionally, expectations and preferences regarding reverberation characteristics in different types of spaces were discovered. These findings have significant implications for the design of virtual environments, and understanding these aspects can contribute to improving VR technology and creating more immersive and realistic virtual experiences for users.
4
Content available Providing Surround Sound with Loudspeakers: A Synopsis of Current Methods
75%
Blauert J. , Rabenstein R.
Archives of Acoustics
|
2012
|
tom Vol. 37, No. 1
5-18
EN
Available methods for room-related sound presentation are introduced and evaluated. A focus is put on the synthesis side rather than on complete transmission systems. Different methods are compared using common, though quite general criteria. The methods selected for comparison are: INTENSITY STEREOPHONY after Blumlein, vector-base amplitude panning (VBAP), 5.1-SURROUND and its discrete-channel derivatives, synthesis with spherical harmonics (AMBISONICS, HOA), synthesis based on the boundary method, namely, wave-field synthesis (WFS), and binaural-cue selection methods (e.g., DIRAC). While VBAP, 5.1-SURROUND and other discrete-channel-based methods show a number of practical advantages, they do, in the end, not aim at authentic sound-field reproduction. The so-called holophonic methods that do so, particularly, HOA and WFS, have specific advantages and disadvantages which will be discussed. Yet, both methods are under continuous development, and a decision in favor of one of them should be taken from a strictly application-oriented point of view by considering relevant application-specific advantages and disadvantages in detail.
5
Content available Influence of Loudspeaker Configurations and Orientations on Sound Localization
75%
Yao S.-N.
Archives of Acoustics
|
2022
|
tom Vol. 47, No. 1
57--70
EN
As the virtual reality (VR) market is growing at a fast pace, numerous users and producers are emerging with the hope to navigate VR towards mainstream adoption. Although most solutions focus on providing high- resolution and high-quality videos, the acoustics in VR is as important as visual cues for maintaining consistency with the natural world. We therefore investigate one of the most important audio solutions for VR applications: ambisonics. Several VR producers such as Google, HTC, and Facebook support the ambisonic audio format. Binaural ambisonics builds a virtual loudspeaker array over a VR headset, providing immersive sound. The configuration of the virtual loudspeaker influences the listening perception, as has been widely discussed in the literature. However, few studies have investigated the influence of the orientation of the virtual loudspeaker array. That is, the same loudspeaker arrays with different orientations can produce different spatial effects. This paper introduces a VR audio technique with optimal design and proposes a dual-mode audio solution. Both an objective measurement and a subjective listening test show that the proposed solution effectively enhances spatial audio quality.
6
Content available Stanowisko badawcze CIOP-PIB do badań percepcji dźwięku przestrzennego z zastosowaniem techniki ambisonicznej
63%
Szczepański G. , Morzyński L. , Pleban D. , Młyński R.
Bezpieczeństwo Pracy : nauka i praktyka
|
2018
|
tom nr 10
24-27
PL
W warunkach środowiska pracy sygnały akustyczne mogą być źródłem informacji wpływającej na bezpieczeństwo pracowników. Możliwości percepcji dźwięków, słyszenia kierunkowego czy też orientacji przestrzennej osób w środowisku pracy zależą od szeregu czynników, takich jak właściwości akustyczne pomieszczeń pracy, hałas i jego parametry, ubytki słuchu, stosowanie ochron słuchu czy protez słuchu. Badanie wpływu tych czynników na wymienione możliwości (percepcja, słyszenie kierunkowe, orientacja) wymaga zastosowania dźwięku przestrzennego i ma istotne znaczenie dla tworzenia bezpiecznych warunków pracy. W artykule przedstawiono podstawowe informacje na temat techniki ambisonicznej jako jednej z technik przetwarzania dźwięku przestrzennego. Scharakteryzowano wykonane w Centralnym Instytucie Ochrony Pracy – Państwowym Instytucie Badawczym stanowisko laboratoryjne umożliwiające prowadzenie (z wykorzystaniem techniki ambisonicznej) badań percepcji dźwięków, słyszenia kierunkowego i orientacji przestrzennej osób.
EN
Acoustic signals can be a source of information affecting workers’ safety in the working environment. Sound perception, directional hearing and spatial orientation of people in the working environment depend on a number of factors, such as acoustic properties of the work room, noise and its parameters, the use of hearing protection, hearing loss or the use of hearing aids. Learning about the impact of these factors on perception, directional hearing and orientation requires using spatial sound and is essential for creating safe working conditions. This article presents basic information about ambisonics, a technique of spatial sound processing, and a test stand developed at the Central Institute for Labour Protection - National Research Institute for research on sound perception, directional hearing and spatial orientation of people using ambisonics.
7
Content available Eksternalizacja w binauralnej ambisonicznej auralizacji źródeł kierunkowych
63%
Mróz B. , Kostek B.
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
|
2018
|
tom Nr 60
75--80
PL
W artykule przedstawiono najważniejsze składniki procesu skutecznego renderowania trójwymiarowego obrazu dźwiękowego za pomocą słuchawek. W tym celu badany jest stopień oddziaływania poszczególnych czynników wpływających na eksternalizację dźwięku: śledzenie położenia głowy (ang. head tracking), indywidualne funkcje przenoszenia głowy (HRTF – Head Related Transfer Function, odnoszące się do matematycznej funkcji propagacji dźwięku wokół głowy), model pomieszczenia, jak również tzw. efekt zgodności pomieszczenia oraz indywidualne wyrównywanie charakterystyki przenoszenia słuchawek. Uzyskane wyniki wskazują, że śledzenie głowy, a także indywidualne funkcje przenoszenia głowy mają kluczowe znaczenie dla wiernej reprodukcji dźwięku. Z przeprowadzonych badań wynika również, że efekt zgodności pomieszczenia i wyrównywanie charakterystyki przenoszenia słuchawek są znaczącymi elementami procesu auralizacji.
EN
The article presents the most important components of the process of effectively rendering a three-dimensional sound image using headphones. To this end, the impact of a set of factors affecting sound externalisation is examined: head tracking, individual head transfer functions (HRTF – Head Related Transfer Function, related to the mathematical function of sound propagation around the head), room model, as well as a so-called room divergence effect and individual headphone alignment. Furthermore, the directivity aspect of the sound source is discussed as a convenient way to control Direct-toReverberant ratio and thus provides a robust control of the auditory distance. The results obtained indicate that the tracking of the head position as well as the individual functions of the head transfer are crucial for faithful sound reproduction. The conducted research also shows that the effect of room compliance and headphone alignment prove to be significant factors throughout the auralisation process.
8
Content available Application of an ambisonic microphone for the measurements of room acoustic parameters
63%
Jasiński M. , Żera J.
Vibrations in Physical Systems
|
2022
|
tom Vol. 33, nr 3
art. no. 2022312
EN
The most commonly used measurement technique in room acoustics employs a single omnidirectional microphone for recording the room impulse response and further derivation of such acoustical parameters as T30, EDT, C50 or C80. Instead, ambisonic technology makes it possible to measure a spatial room impulse response. Ambisonics decomposes the signal from the spherical microphone array into spherical harmonics to shape the directivity. Ambisonics lets to go beyond basic acoustical parameters and allows to determine spatial features of a sound field at the measurement point. This study presents the comparison of fundamental acoustic parameters measured in the recording studio by an actual omnidirectional microphone and virtual omnidirectional microphones derieved from ambisonic microphones of the first and third order. The results show the usefulness of ambisonic technology in terms of assessing basic room parameters.
9
Content available Localization of sound sources in binaural reproduction of first and third order ambisonics
63%
Sagasti A. , Pietrzak A. P. , Martin R. , Eguinoa R.
Vibrations in Physical Systems
|
2022
|
tom Vol. 33, nr 2
art. no. 2022214
EN
The use of higher-order ambisonics in spatial sound recordings makes it possible to increase the accuracy of recording information about the direction from which the sound comes to the listener. However, with binaural ambisonic sound reproduction, the listener's ability to locate the sound source accurately may be limited. This paper presents a comparison of the listener's ability to locate a sound source during binaural listening to recordings made with first and third order ambisonic microphones. The analysis was carried out for two types of signal: pink noise and ringing sound. The analysis of localization errors depending on the ambisonics order, azimuth and elevation angles as well as the type of signal is presented. The obtained data indicate that in binaural reproduction of the ambisonic sound the localization errors in the azimuth plane were smaller for the third order ambisonics, compared to the first order. In the elevation plane both for first and third order the errors were significant.
10
Content available Providing Surround Sound with Loudspeakers: A Synopsis of Current Methods
63%
Blauert J. , Rabenstein R.
|
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.