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Application for Cinema Acoustics

Cinema positioning:

Cinema quality standard id divided into special, A, B, C four levels (cross combine with extra large, large, medium and small). A, B, C and other corresponding requirements should meet the following provision:

1.The durable years of main structure: grade A more than 100 years, grade B 50~100 years, grade C  25 to 50 years.

2.Fireproof grade: grade A and B should not be lower than class two, grade C should not be lower than class three, and should not have extra large.

3.Audio visual facilities: grade A should set the stereo. Grade A above large-scale auditorium main structure should be able to have the conditions to project or can be converted to project 70mm film later. Grade A set patchwork 5.3mm BSV LCD splicing screen, and the ticket office should not have less than 16 BSV.

 

Flat layout:

The general layout should have clear functional partition, pedestrian traffic and vehicle traffic, audience streamlines and internal routes (technology and management) are clear and convenient, which do not interfere with each other and should meet the following requirements:

1.In a fire or other emergency, visitors and staff should be able to quickly evacuate to illuminated safety zone, and provide appropriate access and venue for fire fighting operations.

2.The cinema with one side facing the street, medium and small should have at least one other side facing the inner courtyard open space or access; Large and extra large should have at least two other sides facing the inner courtyard open space or access and its width should not be less than 3.5m.

3.Co-built and attached cinema should be divided into independent fireproof district by the firewall and adjacent buildings, the remaining open part should still  implement the above paragraph.

4.Equipment room should be placed in the position which has least interference with the audience, and should pay attention to safety, health, noise reduction, vibration reduction and equipment installation and maintenance convenience.

5.The general plane should set up motor vehicles and bicycles parking, or consider by urban transport planning.

6.The total plane should still meet the drainage, noise isolation, energy saving and other requirements,  and arrange greening according to the conditions.

 

Audience hall design:

Auditorium is a major part of the cinema, the screen is the basis of the auditorium design, the screen size determines the audience capacity. The larger the screen the larger the audience can be accommodated, the auditorium with less audience whose screen is relatively narrowed, so the scale of the auditorium actually depends on the size of the screen. The shape of the screen also determines the size of the auditorium, which is especially true for the new form film. Different varieties have different screen shapes, large-screen movie screen size determines the height of the audience hall ratio. The screen of ring screen movie decides that the auditorium must be circular, and the dome movie screen needs a dome auditorium and so on. General cinema screen cinema auditorium is rectangular or trapezoidal, and the ground has a certain slope.

 

A. Cinema Architectural acoustics requirements

1.Architectural acoustics design of cinema should provide the appropriate auditorium acoustics for the sound of movie.

2.The acoustical design of the cinema auditorium should consider the space in which the screen is set as a whole. Auditorium cinema should not set up balcony.

3.When projecting the movie, audience hall should have good clarity everywhere, really restore the movie's sound playback.

4.When the movie is projected, there should be no echo, multiple echo, chatter echo, acoustic focus and resonance anywhere in the auditorium, and should not be interfered by cinemas equipment noise, projector room noise or external environmental noise.

 

B. Auditorium size requirements

1. The length of the auditorium should not be greater than 30m, auditorium length and width ratio should be (13~1.7):1.

2. Auditorium each volume should be 60-8.0m3 / seat. (Note: Volume calculation includes the space to set the screen)

3. Cinema auditorium design should prevent the chatter echo caused by setting surround speakers on the side wall.

4. Auditorium rear wall should take measures to prevent echo.

5.The headwall behind the speaker group should carry out strong sound absorption process, the average absorption coefficient in the 125~4000Hz frequency range should not be less than 0.6, sound absorption coefficient of 125Hz should not be less than 0.4.

6. Auditorium interior decoration should consider the speaker group installation location and installation requirements. When the speaker is sounding, speaker support and surrounding structures shall not produce vibration noise.


C.Auditorium reverberation time

1.The auditorium full appropriate reverberation time should meet the following provisions:

At a frequency of 500 ~ 1000Hz, we should use a different volume appropriate reverberation time range shows as the picture.

2.The stereo cinema with auditorium volume less than 500m³ should use the same suitable reverberation time range as the 500m³.

3.Reverberation time frequency characteristics relative to 500 ~ 1000Hz ratio should comply with the provisions of table 1.

4.Reverberation time should separately estimate 125Hz250Hz500Hz1000Hz2000Hz and 4000Hz six frequencies. The estimate should take two-digit valid values.

 

Figure 1 shows the cinema for different volume audience hall, the range of the appropriate reverberation time T at 500-1000 Hz;

Table 1 shows the ratio of auditorium cinema frequency reverberation time relative to 500 ~ 1000Hz.

cinema frequency reverberation time relative to 500 ~ 1000Hz.jpg

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