THE FEATURES OF CINEMA HALL ACOUSTICS UPON INSTALLATION OF THE DOLBY SOUND RECORDING SYSTEM

Abstract

Summary Investigations conducted in a cinema hall have shown that the character of the sound field decay in all rows of the main floor is uniform. The character of the sound field decay in the balcony is similar to that on the main floor. The maximal decay energy in the balcony is lower by about 2 dB compared to that on the main floor. After the reconstruction of the hall, the energy decay of a similar character was found both on the main floor and in the balcony. The decay of energy is much faster because the sound absorption of the entire hall has increased. The maximal energy values, however, are higher in the balcony and under it compared to the main floor. After the reconstruction the overall hall absorption has increased by about 200–300 m2 both on the main floor and in the balcony. Consequently, the reconstruction should have resulted in the decrease of the maximal energy in both areas. Actually, the maximal energy value is higher in the balcony. At the frequency 63 Hz, the maximal energy value in ...