Audio Engineering

842 Chapter 29 To many, the subject of studio acoustics is considered a black art, often surrounded by considerable hype and inc ...

Room Acoustics 843 25 dBA or less, which subjectively is very quiet. (The majority of domestic living rooms, considered by their ...

844 Chapter 29  10 0 10 20 30 40 50 60 70 31.5 63 125 250 500 1000 2000 4000 8000 Frequency (Hz) Octave band sound pressure lev ...

Room Acoustics 845 29.2.1 External Airborne Noise Here we are typically concerned with noise from local road traffi c, aircraft, ...

846 Chapter 29 29.2.3 Internal Noise Transfer The biggest noise problem in most studios is noise generated or transmitted by the ...

Room Acoustics 847 carpeting adjacent corridors or offi ce fl oors can generally overcome the majority of such problems. Whereve ...

848 Chapter 29 Figure 29.3 shows the so-called mass law of sound insulation, which shows that sound insulation increases by appr ...

Room Acoustics 849 From the graph shown in Figure 29.3 , it can be seen that some pretty heavy constructions are required in ord ...

850 Chapter 29 Table 29.3 : Typical Sound Absorption Coeffi cients Hz Material 125 250 500 IK 2K 4K Drapes 0.07 0.37 0.49 0.31 0 ...

Room Acoustics 851 Triple layer constructions and multiple layer heavy masonry constructions can be employed to achieve improved ...

852 Chapter 29 on-site value (i.e., what is actually achieved). Great care has to be taken to the sealing of all joints and to a ...

Room Acoustics 853 would short-circuit the isolation and negate the whole effect. With such constructions, particular care has t ...

854 Chapter 29 Table 29.4 : Continued Materials SRI (dB) Floors 21-mm  1 & g boards or 19-mm chipboard 35 110-mm concrete a ...

Room Acoustics 855 For orchestral or classical music recording, the studios need to be relatively large and lively, with reverbe ...

856 Chapter 29 scenes. Recent advances in digital reverberation, room simulation, and effects have, however, added a new dimensi ...

Room Acoustics 857 At certain specifi c frequencies, the refl ections are perfectly in phase with each other and cause a resonan ...

858 Chapter 29 frequency. Variations of 10–15 dB within the room response are quite common unless these modal resonances are bro ...

Room Acoustics 859 The room (studio) dimensions should therefore be selected to give as even as possible distribution of the Eig ...

860 Chapter 29 The frequencies at which main axial room resonances occur can be simply found using the following formula: F n re ...

Room Acoustics 861 The complete formula for calculating the complete series of modes is as follows: F nx Lx ny Ly nz Lz  172 ...