Reverberation times of the several recording studios and control rooms were measured using three different signal sources: pink noise, warbled sine wave signal and beats of wooden clapper. The reverberation times obtained with each of the three signal sources were compared with the final average value of all measurements. The analysis, repeated in different acoustical surroundings, confirmed that the results achieved with three different signal sources had the fluctuations which could be explained as accidental. Remarkable fluctuations, noticed in a few small control rooms, at low frequencies, were probably caused by the insufficient diffusiveness and room resonance phenomena. In the same rooms the considerable fluctuations appeared not only in comparison with the values obtained with the different signal sources but also by comparing the results achieved with the same signal at different measuring microphone positions. Furthermore, one has noticed, that the results obtained with the bests of wooden clapper had slightly higher values of the reverberation time than those obtained with pink noise and warbled sine wave. It was particularly apparent in a few small control room sin which the tin case panels, covering the recording equipment, were excited by the sound energy of the beats and produced some kind of additional reverberation. The frequency analysis of the beats was carried out equally by means of a computer. The analysis confirmed that beats of wooden clapper could be used as a sound source of the wide frequency bandwidth.
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