Comparative studies of library acoustics with the review of Noise and the level of sound pressure in the hall for girls and boys

Nowadays, there are problems such as noise pollution in the environment. In line with the emergence of these problems, topics such as providing sound comfort and proper distribution of sound in architectural spaces find a special place. Depending on the use of spaces, the degree of importance of this issue is different. In spaces such as libraries, access to sound comfort is among the priorities. One of the optimal space requirements in the library from the sound point of view is to prepare a relatively quiet environment without additional disturbances (such as traffic, internal ventilation, noisy people) and noise control. The proper distribution of sound in the study hall by expressing the issue of speech privacy and in meeting halls by expressing the issue of speech clarity is the focus of this research.

Research method, This research was conducted experimentally by measuring the sound intensity in the reading rooms of the girls and boys of Tabriz Central Library using the 2260B&K sound meter and the H8 recorder. The graphs obtained from the sound meter were extracted in Excel software and the recorder graphs were analyzed in MATLAB software. Finally, it has been adapted to the NC standard graph.

Statement of the problem: In the matted spaces of the library, where the physical boundaries become fainter, non-visual boundaries become visible. The place of sound has been important in the architecture of the past so that it has become a modern science. The problem of proper distribution of sound in libraries led this research to examine comparative studies between sound and architecture in library reading rooms. The purpose of the research: The main purpose of the research is to create sound comfort and reduce harmful sound reflections in these spaces to create speech privacy. To achieve this goal, the relationship between the transmission and distribution of sound has been analyzed by examining the geometry of the halls and the materials used. The final goal of the research is to investigate the effect of the gender of the voices of girls and boys in the halls. Research questions 1- What effect does the reduction of noise in the library space have on the process of speech privacy for users?

The general results of the research showed that the gender difference of sound in spaces requires a special architecture, especially in the girls' reading houses, due to the wide range of frequencies, necessitates the use of fibers and shells on the surfaces. Sound comfort and security are harmful reflections, despite the sense of place and sense of belonging for users in the library, in the degree of the environment's desirability, is one of the goals of this research. Examining the forms in the overall volume and surfaces of the floor, wall and ceiling and dealing with materials with appropriate absorption coefficients and creating speech and hearing privacy are the other research goals. The final goal of the research is to examine the combination of the frequency spectrum and the effect of the gender of girls' and boys' voices in the halls and to design an architectural solution in case of combining the frequency spectrum. By strengthening the architectural features in the field of sound, it becomes possible to formulate principles in the architectural design of libraries and acoustics.