Multi-Channel System for Sound Creation in Open Areas

Gołaś, Andrzej; Suder-Dębska, Katarzyna

doi:10.2478/v10168-012-0041-4

Cited by 3 publications

(4 citation statements)

References 9 publications

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“…The analysis was carried out with use of the ray tracing technique, in which 100000 rays were used per every source and up to 6 surface reflections were examined. Results of numerical simulations deviate from results of measurements in the limit of several percent [3].…”

Section: Kraków Opera Housecontrasting

confidence: 59%

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The Influence of Sound Source Directivity on Acoustics Parameters Distribution in Kraków Opera House

2010

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Determining of Kraków Opera House's basic acoustics parameters by using numerical simulations is presented in the paper. Parameters have been obtained by using numerical simulation methods. Sound sources have been created by means of FEA, however acoustic field distributions have been analysed by geometrical methods. Apart from the room parameters definition, it is necessary to determine sound source parameters like acoustic power level and directivity pattern. In the simplest case, the sound source can be assumed as omni-directional point source. However it does not reflect most real-live sources precisely. When the literature and databases do not contain any information about the sound source directivity pattern, it can be obtained numerically using FEA. First, the sound source model is created, and then results from its spherical boundary are used to define the source in a program based on geometrical methods. Here have been analysed several distributions of acoustic parameters like: Direct Energy, Sound Pressure Level (SPL), Clarity index (C80) etc. The results indicate that influence of sound source directivity on acoustics parameters changes is essential.

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Section: Kraków Opera Housecontrasting

confidence: 59%

“…When the literature and databases do not contain any information about the sound source directivity pattern, it can be obtained numerically as in Sect. 3.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Sound Source Directivity on Acoustics Parameters Distribution in Kraków Opera House

2010

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“…Except of the analysis of influence of the shape and features of the object on its acoustic properties, simulation programs based upon geometrical methods enable also analysis of acoustic field distribution depending on location and character of the sound source or sound sources [21][22][23]. Results of simulation performed on the basis of geometrical methods are reflecting to a high degree the state from real objects [24,25]. It is necessary to point out that it is still the area of analysis of acoustic field, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…The values are selected in such way that in the result of amplified open area it could be possible to obtain an acoustic field with properties close to the properties of acoustic field obtained in a good concert hall [27][28][29]. Algorithm of proceeding is as follows [30] Because the tested area was an open area, the attention was primarily drawn to parameters speaking about impressions of spatial sound -parameters from group Lateral Sound. As a result of performed experiments we can say that regarding the spatial impression of sound, the quality of received sound in an open area has been considerably improved in relation to quality of the sound obtained with classical amplification, i.e.…”

Section: Introductionmentioning

confidence: 99%

Verification of Inverse Image Source Method Applied for Acoustic Field Creation in Open Area

et al. 2011

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The paper presents an original method for sound reinforcement in open areas. The method enabled both a regular sound reinforcement and the required spatial impressions of sound to be achieved in the area used for the study. The inverse image source method was used for the disposition of sound sources in order to find the inverse problem solution for determining the configuration of additional sound sources. Simulations demonstrated the improvement of sound impressions in the area in question and the simulations results were verified experimentally. The intended result of the proposed method was the increase of the lateral energy fraction and lateral energy fraction coefficient parameter values by 6 and 8 points, respectively, for the simulation by 5 and 7 points for the experiment. It should be stated that, in both the simulation and the experiment, eligible values for the acoustic parameters were obtained after using the sound system with additional sound sources, the speech intelligibility value parameters remain at an excellent level. In conclusion, it may be claimed that the proposed sound reinforcement system makes the creation of the intended spatial sound impressions in an open area possible.

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Synthesis of the Impulse Response of the Transmission Path in a Selected Area of the Sound Field

2013

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Providing appropriate sound eld parameters in the listening area is very important. It often determines the possibilities of being able to use a facility. Assuming that the sound system is a linear object, it can be described by the impulse response. Unfortunately, it is not possible to designate a single impulse response for such a facility because it is a continuous system. Thus each path between the transmitter and the receiver has its own impulse response. Therefore, the authors have made an attempt to synthesize the impulse response for transmitterreceiver paths with suitable parameters of the sound eld in the neighbourhood of the receivers. A technical implementation of the presented synthesis will take place through introduction of additional sources. An experimental determination of the impulse response is relatively simple. The transient response can be numerically determined by using, for example, the nite element method or the boundary element method. Unfortunately, determining the impulse response through simulation of, e.g., planned objects, is much more dicult due to the high computational cost and the lack of precise data on the properties of the materials. For this reason, the authors used an energetic analogue of the impulse response, the echogram.

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Multi-Channel System for Sound Creation in Open Areas

Cited by 3 publications

References 9 publications

The Influence of Sound Source Directivity on Acoustics Parameters Distribution in Kraków Opera House

The Influence of Sound Source Directivity on Acoustics Parameters Distribution in Kraków Opera House

Verification of Inverse Image Source Method Applied for Acoustic Field Creation in Open Area

Synthesis of the Impulse Response of the Transmission Path in a Selected Area of the Sound Field

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