Standard cinema architectural design specification
Standard cinema architectural design specifications are only interested in this aspect or friends in need of work. I. Acoustic design1Basic requirements 1.1 Cinema architectural design should include acoustic design, acoustic design should run through the entire process of cinema design. 1.2 The acoustic design of the auditorium should ensure that the appropriate reverberation time, uniform sound field, and sufficient loudness are achieved in the auditorium, satisfying the direct radiated sound energy of the speaker to the auditorium, keeping the viewing direction consistent, while avoiding echo, vibrating echo, sound Focus on acoustic defects and control the intrusion of noise. 1.3 The range of seats with good stereo effect in the auditorium should cover more than 2/3 of all seats. 1.4 The back wall of the auditorium should be equipped with a full-band strong sound absorption structure that prevents echo. 1.5 The wall behind the screen should be treated with sound absorption. 2Auditorium mixing time 2.1 Cinema reverberation time should be calculated according to the actual formula of the auditorium according to the following formula or determined from Figure 2.1: The upper limit formula at 500Hz is: T60≤0.07653V0.287353 (2.1-1) The lower limit formula at 500 Hz is: T60 ≥ 0.032808 V 0.333333 (2.1-2) where T60 - auditorium reverberation time (s); V - actual volume of the auditorium (m3). 2.2 The frequency characteristics of reverberation time in the auditorium of special, A and B cinemas shall comply with the provisions of Table 2.2. Figure 2.1 Correspondence between reverberation time and its volume required in the cinema auditorium Table 2.2 Frequency characteristics of the reverberation timetable of the special auditorium of Class A, Class A and Class B cinemas
(Hz)
63
125
250
500
1000
2000
4000
8000
T60f/T60500
1.00~1.75
1.00~1.50
1.00~1.25
1.00
0.85~1.00
0.70 to 1.00
0.55~1.00
0.40~0.90
2.3 The frequency characteristics of reverberation time in the audience hall of Class C cinema shall comply with the provisions of 125Hz, 250Hz, 500Hz, 1kHz, 2kHz and 4kHz in Table 5.2.2. 3Noise Control 3.1 The impact of various types of noise on the environment in the cinema shall be implemented in accordance with the current national standard “Urban Regional Environmental Noise Standards†GB3096. 3.2 The auditorium should use public spaces such as lounges, foyers, and corridors as noise-reduction measures. The entrance and exit of the audience hall should be set up with a voice lock. 3.3 When the projector and air conditioning system are simultaneously turned on, the background noise of the auditorium should not be higher than the sound pressure level corresponding to the NR noise evaluation curve (Fig. 3.3) in the case of empty field (Table 3.3). Figure 3.3 NR noise evaluation curve Table 3.3 Sound pressure level of cinema noise in the cinema auditorium
Cinema level
Special grade
Class A
Grade B
Class C
Auditorium background noise (dB)
NR25
NR30
NR35
NR40
3.4 The partition wall between the auditorium and the projector room should be treated with sound insulation. The medium frequency (500~1000Hz) sound insulation should not be less than 45dB. 3.5 The interval sound volume of adjacent audience halls shall be no less than 50clB for low frequencies and no less than 60dB for medium and high frequencies. 3.6 The sound insulation of the auditorium of the auditorium should not be less than 35dB. The space with the sound lock should be treated with sound absorption and noise reduction. 3.7 The auditorium with air conditioning system or ventilation system shall take measures to prevent crosstalk between the hall and the hall. Equipment such as air-conditioned computer rooms should be kept away from the audience hall. Air conditioning or ventilation systems should adopt noise reduction, noise reduction and vibration isolation measures. 4Speaker Arrangement 4.1 After-screen movie The sound-receiving speaker should use a high- and low-frequency speaker system. The tweeter in the system should be a constant directivity horn loudspeaker with a horizontal directivity of less than 90. The vertical directivity should not be less than 40. . 4.2 The installation height and inclination angle of the loudspeaker should be positioned with the acoustic radiation center and the acoustic radiation axis of the high-frequency loudspeaker. The acoustic radiation center should be placed at 1/2 to 2/3 of the height of the screen. The acoustic radiation axis should point to the end. A row of spectators is 1.10~1.15m above the ground. 4.3 The speaker and its bracket should be installed firmly to avoid resonance noise. 4.4 Stereo main channel speaker arrangement should meet the following requirements: 1 3 or 5 sets of speakers should be set after the screen, the sound radiation center height of the speaker should be consistent; 2 speaker spacing should be equal, and there is enough distance, both sides of the speaker The margins should not exceed the screen border. 4.5 The arrangement of stereo surround speakers should meet the following requirements: 1 Speakers should be placed in the side wall and back wall of the auditorium, which can be arranged in two ways (left, right) or four (left, right, left rear, right rear) The number of configurations should be determined according to the speaker's sounding distance, power requirements and directivity. The configured speakers should be able to perform reasonable impedance series-parallel distribution; 2 the horizontal position of the first speaker in the front of the auditorium should not exceed the first row of seats. The maximum distance between the front area speaker and the rear area speaker should not exceed 17m, the speaker spacing should be consistent, and should be designed with acoustic decoration; 3 the installation height of the speaker can be based on the height of the speaker sound radiation center from the ground, according to the audience hall The width is calculated by the following formula: H - the height of the sound radiation center of the speaker from the ground (m); W - the width of the auditorium (m). 4 The acoustic radiation axis of the side wall speaker should be perpendicularly pointed to the opposite side of the seat from 1.10 to 1.15m. The acoustic radiation axis of the rear wall speaker should be perpendicular to the front row of the auditorium from 1.10 to 1.15m. The arrangement of 4.6 low-frequency channel speakers should meet the following requirements: 1 It should be set on the ground of any channel on the main channel of the rear screen of the screen, and do vibration reduction treatment; 2 The number of configurations can be determined according to the sounding distance and power requirements of the speaker; More than 3 speakers should be placed in one place, making full use of the mutual coupling effect of the speakers. 4.7 The difference between the maximum and minimum sound pressure levels of the auditorium should not exceed 6dB, and the difference between the maximum and the average should not exceed 3dB. Standard cinema architectural design specification