Acoustic system

Abstract

An acoustic system improves the acoustic quality in a room for speech. The acoustic system includes a room having a first zone, a second zone, and a ceiling. The ceiling includes a plurality of ceiling tiles. The ceiling tiles include a first group of ceiling tiles having sound absorbing properties and a second group of ceiling tiles having sound diffusing properties.

1 - 16 . (canceled) 
     
     
         17 . An acoustic system for improving an acoustic quality in a room for speech, the acoustic system comprising:
 a room having a first zone, a second zone, and a ceiling, the ceiling comprising a plurality of ceiling tiles, wherein the ceiling tiles comprises a first group of ceiling tiles having sound absorbing properties and a second group of ceiling tiles having sound diffusing properties, wherein the first group of ceiling tiles comprises ceiling tiles being arranged in the second zone and the second group of ceiling tiles comprises ceiling tiles being arranged in the first zone and being configured to reflect sound to the first zone and to the second zone.   
     
     
         18 . The acoustic system according to  claim 17 , wherein the first zone is a presentation zone and the second zone is an audience zone. 
     
     
         19 . The acoustic system according to  claim 17 , wherein the ceiling is a suspended ceiling, a direct fixed ceiling, or a free hanging ceiling unit. 
     
     
         20 . The acoustic system according to  claim 17 , wherein the ceiling comprises a grid of profiles supporting the ceiling tiles. 
     
     
         21 . The acoustic system according to  claim 17 , wherein the second group of ceiling tiles covers at least 5% of a ceiling area of the ceiling. 
     
     
         22 . The acoustic system according to  claim 17 , wherein the second group of ceiling tiles covers at most 25% of a ceiling area of the ceiling. 
     
     
         23 . The acoustic system according to  claim 17 , wherein the first group of ceiling tiles comprises ceiling tiles mounted in the second zone. 
     
     
         24 . The acoustic system according to  claim 17 , wherein the second group of ceiling tiles are hollow having a front surface provided with at least one opening facing the room, wherein a volume of a hollow portion of the ceiling tile is between 0.02 m 3  and 0.04 m 3 . 
     
     
         25 . The acoustic system according to  claim 24 , wherein the volume of the hollow portion of the ceiling tile is 0.03 m 3 . 
     
     
         26 . The acoustic system according to  claim 24 , wherein the second group of ceiling tiles is configured to absorb sound having a sound frequency below 500 Hz. 
     
     
         27 . The acoustic system according to  claim 24 , wherein the second group of ceiling tiles is configured to absorb sound having a sound frequency of 125 Hz. 
     
     
         28 . The acoustic system according to  claim 18 , wherein the presentation zone covers a presentation position from which a speaker is intended to address an audience. 
     
     
         29 . The acoustic system according to  claim 28 , wherein ceiling tiles from the second group of ceiling tiles are arranged directly above the presentation position. 
     
     
         30 . The acoustic system according to  claim 28 , wherein the ceiling is a suspended ceiling and wherein ceiling tiles from the second group of ceiling tiles are arranged to cover an area of the suspended ceiling from the presentation position extending towards the second zone. 
     
     
         31 . The acoustic system according to  claim 18 , wherein ceiling tiles from the second group of ceiling tiles are arranged in the audience zone. 
     
     
         32 . The acoustic system according to  claim 17 , wherein ceiling tiles from the first group of ceiling tiles are arranged in the first zone. 
     
     
         33 . The acoustic system according to  claim 24 , wherein the at least one opening has an opening surface area of between 200 mm 2  and 300 mm 2 ,. 
     
     
         34 . The acoustic system according to  claim 33 , wherein the opening surface area of the at least one opening is 260 mm 2 . 
     
     
         35 . The acoustic system according to  claim 17 , wherein the second group of ceiling tiles comprises ceiling tiles having a front surface facing the room having a shape selected from a group comprising: a single curved convex front surface, a double curved convex front surface, a multi-faceted convex front surface, an asymmetric at least partially inclined front surface, an asymmetrically curved convex front surface, an inclined concave front surface, an at least partially curved concave front surface, and a multi-faceted concave front surface.