SPECIFIC FEATURES OF USING THE FOURTH STAGE OF ACOUSTIC EXPERTISE FOR SPECIAL PURPOSE PREMISES

The subject of the report is the methodology of carrying out an examination of the application for the purpose of establishing the optimal acoustic minds in the prevalence of attribution. The goal is to improve the quality of all stages of acoustic examination, taking into account the premises for which there are special requirements for the quality of the transmitted content or for which there are features in the formation of the sound field. Such a sequence of stages requires the solution of several tasks: determining the conditions for conducting research, taking into account the specifics of the premises and content; selection of hardware and software complex for research; determination of informative criteria for assessing the acoustics of a room, taking into account all its features; processing and analysis of the results obtained. The application of this approach to the stages of acoustic examination was considered on the example of a conference room, for which there were requirements for high quality speech content, a sound reinforcement system was already used in the hall, and there were features in the formation of a sound field. The authors in the article describe the solutions to all the tasks for the investigated room. The results obtained made it possible to analyze the objective characteristics of the sound field and identify the reasons for the low quality of speech content transmission not only in the acoustic calculation, but when using the existing sound reinforcement systems (electroacoustic calculation). Conclusions. The proposed sequence of the stages of acoustic examination makes it possible to identify "problem" places in the formation of the sound field and / or to determine possible solutions even before the stages of checking existing architectural and construction solutions and the development of technical specifications for the construction of enclosing surfaces and measures to create optimal acoustic conditions.

Variasi Fonologis Kosakata Bahasa Arab: Bahasa Arab Fushā dengan Bahasa Arab Maroko

This study aims to explore phonological variations between the Arabic vocabulary of fusha and Moroccan Arabic. This article uses a qualitative method with a literature approach in expressing phenomena that develop, especially in the aspect of phonological variation between Arabic fusha and Moroccan Arabic. The results of this study reveal that there are several phonological variations in the Arabic vocabulary of Fusha with Moroccan Arabic namely: (1) Sound reinforcement such as changes in low vowel sound / a / into moderate vowel sound / e /, (2) Lattice like weakening high vowel sounds / u / become a low vowel sound / a /, (3) Monophonization such as the merging of vowel sounds / a / and / u / into a single vowel sound / o /, (4) Dating which is divided into three categories such as anheresis (dating that occurs in some vocabulary such as aħmaru, azraqu, and asˤfaru become Ħmar, zraq, and sˤfar by removing the vowel / a / at the beginning of a word), syncope (some dating of vowel sounds in the middle such as / a /, vowel / u / and / a /, and vowel / i /, and apokope (The dating of the sound at the end such as the word ʃamsun becomes ʃams, and the word ħamma: mun becomes ħamma: m, the word baħrun becomes baħr by removing the sound / un / at the end of the word).

MORPHO-PHONOLOGICAL OF LOANWORDS IN LAMPUNG LANGUAGE FROM ARABIC

The purpose of this discussion is to find out the process of changing loanwords and the form or type of loanwords that occur. The research method used is a descriptive method. This methodology focuses more on the “what” of the research subject rather than the “why” of the research subject. Data collection used in this study is content analysis and library techniques from literature sources such as dictionaries. Data analysis used in this study is the translational equivalent method. The results of this study found that the loanwords on Lampung language from Arabic through morphophonological processes in the form of sound attenuation, sound reinforcement, sound relaxation, addition of sound, reduction of multiple consonants, dissimilation, and aferesis. Then, the types of loanwords produced by the Lampung language from Arabic Language are in the form of full absorption patterns, partial absorption and pronunciation adjusment. This study contributes to the wealth of linguistic studies, especially Arabic and Lampung language which are widely spoken by the local community.

Radiation and Scattering

At this point, we have made a rather extensive investigation into the sounds that excite Helmholtz resonators as well as the departures from equilibrium that propagate as plane waves through uniform or inhomogeneous media. We have not, as yet, dealt with how those sounds are actually produced in fluids. Our experience tells us that sound can be generated by vibrating objects (e.g., loudspeaker cones, stringed musical instruments, drums, bells), by modulated or unstable flows (e.g., jet engine exhaust, whistles, fog horns, speech), by electrical discharges in the atmosphere (i.e., thunder), or by optical absorption (e.g., modulated laser beams). In this chapter, we will develop the perspective and tools that will be used for the calculation of the radiation efficiency of various sources and combinations of sources, like the sound reinforcement system shown in Fig. 12.1.

Even Dispersion Design for a Compact Linear Loudspeaker Array with Adaptive Genetic Algorithm

Even dispersion is important for live sound reinforcement systems; however, it needs to be carefully designed when using a linear loudspeaker array. This is because the audience area is often large, while the loudspeakers are placed centrally in this case for convenience, and thus both the level and the frequency balance may not remain reasonably constant for all audiences. To solve this problem, the adaptive genetic algorithm is firstly introduced in the parameters optimization. Secondly, taking the radiation characteristics at different frequencies into account, a linear-phase non-uniform filter bank is proposed to decompose the broad frequency band into several sub-bands. The audio is re-synthesized with the optimized parameters in each frequency band for a linear loudspeaker array. To show the validity of the proposed method, the simulations and the experiments are conducted to demonstrate that the sound pressure level in the audience area is distributed within ± 1.33 dB, ranging from 200 Hz to 4000 Hz.