Abstract
New studios for Croatian Radio-Television were planned with the starting user conditions. The background noise level must fulfill N15 or N20 criteria. Demanded reverberation time for a 400 m2 radio studio is Tr=0.6 s, for TV studios of the same area, Tr=0.7 s, and for the 1000 m2 TV studio, reverberation time is 1 s. Since all three studios with built-in control rooms were built in an urban area with excessive noise, it was necessary to obtain very good protection against noise, and at the same time, using the same elements, achieve the desired reverberation time. Special attention was given to flutter echoes and achievement of diffuse sound fields. The inner shell construction was built up using special acoustical building blocks. Besides using double walls, the broad analysis was done in order to avoid any possible problem in sound insulation. The achieved coincident frequency for walls and floors is 7.6 Hz, and this is quite satisfactory. The computer simulation was used during the design of internal sound-absorbing and reflecting surfaces. Described solutions take care of all user demands, as well as the usage particularities of such spaces. The measurements of relevant acoustical parameters were done after the building was finished.
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