This standard specifies the technical requirements that the audio-visual environment (including the projection room) provided by the auditorium building of a cinema should meet. This standard applies to cinemas that project mono or stereo 35 mm ordinary screens, anamorphic widescreens, masked widescreens and 70 mm widescreens, as well as other indoor projection venues. GB/T 3557-1994 Technical requirements for audio-visual environment of cinemas GB/T3557-1994 Standard download decompression password: www.bzxz.net
This standard specifies the technical requirements that the audio-visual environment (including the projection room) provided by the auditorium building of a cinema should meet. This standard applies to cinemas that project mono or stereo 35 mm ordinary screens, anamorphic widescreens, masked widescreens and 70 mm widescreens, as well as other indoor projection venues.

National Standard of the People's Republic of China
Technical requirements for audio-visual environment for cinemas
Specificatinn of audio-visual environment for cinemas
Subject content and scope of application
G8/T355794
Generate GB 3557-:83
GB5302
GB 5303
GR5878
GB:T 1315
This standard specifies the technical requirements that the audio-visual environment (including projection room) provided by the auditorium building of a cinema should meet. This standard applies to cinemas that show monaural or stereo 35mm ordinary screen, anamorphic widescreen, masked widescreen and 70mm widescreen movies, as well as indoor screening venues: 2 Special symbols and terms
2.1 Picture system symbols
The special system symbols of this standard are shown in Table 1. Table
Movie series
Ordinary screen
Anamorphic widescreen
Avoided widescreen
Widescreen
2.2 Design viewpoint
Screen surface and height
1 : 1. 375
1 : 1. 66
Special symbols for picture system
Screen picture width
The reference point in line of sight design is usually located at the midpoint of the lower edge of the screen picture. 2.3 Maximum viewing distance Xe
The horizontal distance from the backrest of the center burning seat in the last row to the designed viewing point (Saibi Figures 2 and 3). 2.4 Minimum viewing distance X
Horizontal distance from the center seat of the row to the design point (see Figure 2, Figure 3). 2.5 Sight line super height value (
Screen height
Projection lens focal length
The intersection of the sight line of the audience in the row from the design point of view and the plumb line of the eyes of the audience in the front row (row or the next row), and the height difference between the eyes of the audience in the front row (see Figure 1)
Audience sleeping in the back row
Audience eye contact in the front row
Design point
Approved by the State Bureau of Technical Supervision on December 28, 1994, sight line super height value C
One or two row spacing
Implemented on August 1, 1995
2.6 Maximum upward viewing angle ZA
GB/T 3557—94
The audience in the center seat of the first row, the angle formed by the sight line and the sight line of the upper edge of the screen with a height of H (see Figure 2). 2.7 Maximum squint angle B
The audience in the side seats watch the screen with a width of W, and the horizontal projection of the sight line at the far end and the main light angle of the projection at that end (see Figure 3)
Figure 2 Maximum upward angle 4
2.8 Horizontal deflection angle √C of the projection optical axis,
The simulated projection of the real angle between the projection optical axis and the center line of the gingival screen on the horizontal plane (see Figure 4): Figure
Maximum squint
Figure 1 Projection optical axis Horizontal Rui℃
2.9 The projection axis needs to be straight deflected C
The projection axis and the central axis of the screen support angle sentence includes the projection of the central axis (see Figure 5). Figure 5 The key deflection angle of the projection axis C
2.10 Explanation of terms
Should be achieved.
It is advisable to strive to achieve,
Can: Allowed to achieve.
3 Auditorium
3.1 Small auditorium (small hall: less than 500 seats) 3.2 Medium auditorium (middle hall): 501~800 seats. 3.3 Large auditorium (large hall) 801 seats or more. CB/T 3557-94
3.4 ​​Unless there are special needs, the capacity of a newly built auditorium should be no less than 100 seats and no more than 1,000 seats. 3.5 The auditorium for showing mono 35mm series movies should be a medium or small hall, and the auditorium for showing 70mm movies should be a large hall. 3.6 Cinemas should use multiple halls to expand capacity, and should not set up balconies, especially large balconies with a capacity of more than one-third of the pit seats. If small balconies are required, the relevant technical requirements should not be lowered. 4 Screen size and viewing distance 1
4.1 Relationship between the images of each system on a screen 4.1.1 The picture heights of 35mm ordinary screen, anamorphic wide screen and masking screen should be basically the same. 4.1.2 The focal length of the projection lens used for projecting 70mm movies should be equal to the focal length of the projection lens used for projecting 35mm ordinary silver movies. Note: 1) The formulas for the relevant control parameters are shown in Table 2. 4.2 The ratio of the maximum viewing distance to the picture width 4.2.1 The ratio of the maximum viewing distance of the hall to the width of the anamorphic wide screen should not be greater than 2.3, and should not be greater than 3.0. 4.2.2 The ratio of the maximum viewing distance of the small hall to the width of the anamorphic wide screen should not be greater than 2.0, and should not be greater than 2.3. At the same time, it is also required that the width of the anamorphic wide screen is not less than 8.00m, and should not be less than 6.00m. 4.2.3 The ratio of the maximum viewing distance of a 70mm auditorium to the width of a 70mm screen should not be greater than 1.65. It should not be greater than 1.85. 4.2.4 The maximum viewing distance of all types of auditoriums should not be greater than 36.00m. 4.3 The ratio of the minimum viewing distance to the width of the screen The ratio of the minimum viewing distance of all types of auditoriums to the width of the anamorphic widescreen screen should not be less than 0.6. The ratio of the minimum viewing distance of a 70mm auditorium to the width of the 70m screen should not be less than 0.5. 5 Maximum upward viewing angle and maximum oblique viewing angle 1
5.1 Maximum upward viewing angle
The auditorium for showing 35mm series movies is based on the height of the anamorphic widescreen screen, and the auditorium for showing 70mm movies is based on the height of the 70mm widescreen screen: the maximum upward viewing angle should not be greater than 40°, and should not be greater than 45°. 5.2 Maximum oblique angle
The auditorium for showing 35mm series movies shall be based on the width of the anamorphic widescreen image, and the auditorium for showing 70mm movies shall be based on the width of the 70mm widescreen image: the maximum oblique angle shall not be greater than 45°. Table 2 Screen size and viewing distance, maximum upward viewing angle and maximum oblique angle control parameters No.
Control index
Same
Relationship between each system
Maximum viewing distance Xu
70 nml widescreen cinema hall
Preferably HH and
35mm series cinema hall
H, *HαH,
Preferably or 36.00 m
Related items in the text
2.1, 4.1.1,
2.3, 4.2. 4
Control index
: minimum viewing distance x
of the largest elevation angle
, maximum oblique angle
6 seats
GB/T3557---94
Continued Table 2
7G mm wide screen cinema
Xm/W.1.65
x ​​should be n6 and
X,/Wa should be 0.5
With H as the base group
With Wn as the base,
35 rl series cinema
Large and medium halls
Xmax/Wm should be s2.3
Xm/W.2.0
(W, should be 8.00 m
X/W2 should be 20.6Www.bzxZ.net
with: as the base,
ZA should be 40°
with W, as the base,
6.1 The seats in the auditorium should be soft. The sound performance of the soft chair is close to the human body. 6.2 The width of the seat should not be less than 0.50m,
6.3 Row spacing and arrangement method
6.3.1 Short row method
6.3.1.1 The row spacing should not be less than 0.80m. Related policies in this article
4.2.1.4.2.2,
2.4,4.3
2.6.5.1
6.3.1.2 The number of seats in each row between two vertical rows is 0. 80 m should not be more than 22. On this basis, 2 seats can be added for every 0.05 m increase in row spacing. If there is a longitudinal aisle on one side of the instrument, the number of seats on the side should be halved. 6.3.1.3 The width of the longitudinal aisle: The longitudinal aisle should not be less than 1.00m, and the side longitudinal aisle should not be less than 0.80m. It is not advisable to set up a vertical aisle at the center axis of the audience.
6.3.2 Long row method
6.3.2.1 The row of soft chairs should not be less than 0.95m, and the row spacing of hard chairs should not be less than 0.90m. 6.3.2.2 The number of rows in the side longitudinal aisle: When the row spacing is not more than 1.00m, it should not be more than 40: When the row spacing is greater than 1.0m, it should not be more than 50.
6.3.2.3 The width of the side longitudinal aisle should be reduced by 1.20 6.3.2.4 In shallow-view design, the long-row method should be used to select C values ​​for each row rather than for each row. 6.33, so that the audience can walk to the hall comfortably and naturally. When the audience area is wide, the seats should be arranged in a row or zigzag shape. 6.4 Other requirements for safe evacuation
6.4.1 Setting of safe passages in the auditorium In addition to meeting the above requirements, the total width of the passage should also meet the requirement of not less than 0.60m per 100 audiences.
6.4.2 The width of the horizontal passage should be not less than 1.20m. The number of seats between the two horizontal passages should not exceed 20 rows. When there is no passage against the back wall, the number of seats in the back area should not exceed 10 rows.
6.4.3 The slope of the gentle floor should not exceed 1:8. After the reverse road is equipped with sliding measures, the slope should not exceed 1:6. When the required slope exceeds this limit, a step-type floor should be used.
7 Sight line design
7.1 Design viewpoint height
GR/T3557-94
The height of the design viewpoint from the ground of the first row of seats: 1.3~1.8m for small halls and 1.5~2.5m for large halls; 0.9~1.5m for 70mm.
7.2 Sight line height
The sight line height of each row should be not less than C.12m. At least the height of the line of sight of every other row should be not less than 0.13m (the longitudinal aisle positions should be arranged in a staggered manner in the front and back). 8 Acoustic defects
The acoustic defects such as echo, energy concentration and strong front-to-back long-delay reflected sound should be avoided in the auditorium. 9 Reverberation time
9.1 When the auditorium has more than 50% of the audience, the 500Hz reverberation time should be as shown in Table 3. Table 3 Reverberation time of auditorium
Control index
Volume.m*
Ta Fn,s
9.2 Frequency characteristics of reverberation time
Monophonic auditorium
560--2 000
C. 5 ~D. B
The frequency characteristics of reverberation time of auditorium should be as shown in Table 4. Above 2000
0. 8-~1. 2
Table 4 Reverberation time frequency generation
Multiple frequency stack Center frequency generation
1 kHz, 2 kHz
9.3 When there are soft chairs with sound absorption performance close to that of human body in the hall, it can be evaluated according to the empty field detection value. 10 Sound field distribution
Stereo auditorium
500~2 00
.4.1.6
1. 1-~1. 5
0. 8--1. 0
Above 2000
G. G-~1. 0
The difference between the maximum and minimum sound pressure levels at each measuring point in the audience should not be greater than 6B, and the difference between the maximum and half mean should not be less than 3 B.
11 Background noise
When the electroacoustic system is not powered on, there are no audiences, and the air conditioning system and projector (with film) are in operation, the noise level in the auditorium should be as shown in Table 5.
12 Projection room
Monophonic auditorium
Should be ≤40 dB(A)
45 dB(A)
12.1 Projection hole and observation tray
GB/T 355794
Table 5 Background noise
Stereophonic audience door
Should be ≤35dR(A)
Should be .40dR（A)
12.1.1 The inner size of the projection hole and observation hole should be 0.30m(width)×0.20m(height), and the outer size of each hole should be too small to avoid blocking the projection beam.
12.1.2 The projection hole should be installed with optical glass perpendicular to the optical axis. Float glass can be used for the observation hole. 12.1.3 The height from the bottom of the projection hole to the floor of the auditorium should be greater than 2.10m and should not be less than 1.90m. 12.2 Projection optical axis deviation angle
12.2.1 Horizontal deviation angle of projection optical axis (C): should not be greater than 3°. 12.2.2 Vertical deviation angle of projection optical axis (C) When showing 35m series movies, it should not be greater than 6° (when there is a balcony, it can be relaxed to 9°); when showing 70mm movies, it should not be greater than 4°. 12.3 The projection room should be well ventilated, but windows should not be opened directly opposite the projection hole. If windows are required, strict shading measures should be taken. 12.4 The structure and decoration of the projection room should be conducive to cleaning, fire prevention, noise reduction and weight reduction. Additional remarks:
This standard is proposed by the Ministry of Radio, Film and Television of the People's Republic of China. This standard is under the jurisdiction of the China Film Science and Technology Research Institute of the Ministry of Radio, Film and Television. This standard was drafted by the China Film Science and Technology Research Institute of the Ministry of Radio, Film and Television.4 The structure and decoration of the projection room should be conducive to cleaning, fire prevention, noise reduction and weight reduction. Additional notes:
This standard is proposed by the Ministry of Radio, Film and Television of the People's Republic of China. This standard is under the jurisdiction of the China Film Science and Technology Research Institute of the Ministry of Radio, Film and Television. This standard is drafted by the China Film Science and Technology Research Institute of the Ministry of Radio, Film and Television.4 The structure and decoration of the projection room should be conducive to cleaning, fire prevention, noise reduction and weight reduction. Additional notes:
This standard is proposed by the Ministry of Radio, Film and Television of the People's Republic of China. This standard is under the jurisdiction of the China Film Science and Technology Research Institute of the Ministry of Radio, Film and Television. This standard is drafted by the China Film Science and Technology Research Institute of the Ministry of Radio, Film and Television.
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