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People’s Republic of China National Film Industry Standard

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Technical requirements and measurement methods for digital cinema LED auditorium

Technical Requirements and Measurement Methods for Digital Cinema LED Auditorium

2023-11-20 Issued, 2023-11-20 Implemented

Issued by the National Film Bureau

Table of Contents

  1. Scope ………………………………………………………………………………. 1
  2. Normative References ………………………………………………………. 1
  3. Terminology and Definitions ……………………………………………….. 1
  4. Abbreviations ………………………………………………………………….. 1
  5. Components of Digital Cinema LED Auditorium ……………………………. 2
  6. Technical Requirements ………………………………………………………. 2
  7. Measurement Methods ………………………………………………………. 3
    1 Measurement Equipment …………………………………………………. 3
    7.2 Measurement Signals ………………………………………………………. 5
    7.3 Measurement Environment and Conditions ………………………… 9
    7.4 Measurement Steps …………………………………………………………. 10
    References …………………………………………………………………………. 18

Foreword

This document is drafted according to GB/T 1.1-2020 “Guidelines for Standardization Work – Part 1: Structure and Drafting Rules for Standardization Documents.”

Please note that certain content in this document may involve patents. The issuing organization of this document does not bear the responsibility for identifying these patents.

This document is under the jurisdiction of the National Film Standardization Technical Committee (SAC/TC 604).

Drafting organizations include:
● China Film Science and Technology Research Institute (Central Propaganda Department Film Technology Quality Inspection Institute),
● Shenzhen Unilumin Technology Co., Ltd.,
● Shenzhen Times Huaying Technology Co., Ltd.,
● China Film Opto-Electronics Technology (Beijing) Co., Ltd.,
● Leyard Opto-Electronics Co., Ltd.

Main drafters include: Liu Zhi, Li Na, Dong Qiangguo, Zhang Wei, Gong Bo, Gao Wufeng, Dong Zhigang, Zhou Yongye, Zhang Penghao, Zhang Shuo, Gao Feng (1983), Gao Feng (1979), Zhang Hui, Wang Jingyu, Jia Bo.

Technical Requirements and Measurement Methods for Digital Cinema LED Auditorium

  1. Scope
    This document specifies the optical and acoustic technical requirements and corresponding measurement methods for digital cinema LED auditoriums.
    This document is applicable to the operation and maintenance, testing and certification, quality supervision, technical management, and the installation, debugging, and acceptance of related equipment in digital cinema LED auditoriums.
  2. Normative References
    The following documents contain provisions which, through normative reference in this document, constitute essential parts of this document. For dated references, only the version cited applies. For undated references, the latest version (including all amendments) applies to this document.
  • GY/T 311—2017 Technical Requirements and Measurement Methods for Cinema Audiovisual Environment
  • GY/T 312—2017 Acoustic Response Specifications and Measurement Methods for Cinema Recording Control Rooms and Indoor Cinemas
  1. Terminology and Definitions
    The following terms and definitions apply to this document.

Digital Cinema LED Projection System
A system used for decoding and playing digital cinema programs and displaying them through LED technology. It mainly consists of a digital cinema playback server, LED controller, LED display, and sound system.

Digital Cinema LED Auditorium
An auditorium that uses a digital cinema LED projection system to display films.

Electro-Optic Transfer Characteristic
The relationship between the input encoding value and the display brightness of an LED screen, represented by characteristic values.

Stereoscopic Extinction Ratio
The ratio of the left-eye (or right-eye) image brightness to crosstalk light and ambient light, used to measure the resistance of the left-eye (or right-eye) image brightness to crosstalk light and ambient light.

  1. Abbreviations
    The following abbreviations apply to this document.
  • HDR: High Dynamic Range
  • LED: Light Emitting Diode
  • SDR: Standard Dynamic Range

Components of Digital Cinema LED Auditorium
A digital cinema LED auditorium consists of a digital cinema LED projection system and other auxiliary systems. The digital cinema LED projection system mainly includes the digital cinema playback server, LED controller, LED display, and sound system, as shown in Figure 1.

Figure 1 Components of Digital Cinema LED Auditorium

6. Technical Requirements
The technical requirements for digital cinema LED auditoriums should comply with the provisions outlined in Table 1.

Table 1 Technical Requirements for Digital Cinema LED Auditorium
  1. Measurement Methods
    Measuring Equipment

7.1.1 Imaging Luminance Meter
The imaging luminance meter should meet the following requirements:

  • Measurement range: ≥0.0005 cd/m² to 5,000 cd/m²
  • Accuracy: ≤±3%
  • Pixel count: ≥6,576×4,384

7.1.2 Imaging Chromaticity Meter
The imaging chromaticity meter should meet the following requirements:

  • Accuracy x, y: ≤±0.003
  • Pixel count: ≥6,576×4,384

7.1.3 Spectral Radiometric Luminance Meter
The spectral radiometric luminance meter should meet the following requirements:

  • Measurement range: ≥0.001 cd/m² to 5,000 cd/m²
  • Receiving angle: ≤1°
  • Accuracy: ≤±2%

7.1.4 Spectral Radiometric Chromaticity Meter
The spectral radiometric chromaticity meter should meet the following requirements:

  • Wavelength range: 380 nm to 780 nm
  • Measurement bandwidth: ≥2.5 nm to 20 nm
  • Receiving angle: ≤1°
  • Chromaticity accuracy x, y: ≤±0.002

7.1.5 Reflectance Meter
The reflectance meter should meet the following requirements:

  • Can measure specular reflectance and diffuse reflectance
  • Illumination: d/8 integrating sphere structure (diffuse illumination)
  • Integrating sphere size: ≥Ø54 mm
  • Light source: Pulsed xenon lamp, quantity ≥2, capable of simulating standard illuminants A, C, D50, D65, etc.
  • Wavelength range: ≥360 nm to 740 nm
  • Reflectance measurement range: ≥0% to 175%
  • Display resolution: 0.01

7.1.6 Noise Signal Generator
It should comply with the requirements in section 5.2.4 of GY/T 311—2017.

7.1.7 Measurement Microphone
It should comply with the requirements in section 5.2.5 of GY/T 311—2017.

7.1.8 Sound Level Meter
It should comply with the requirements in section 5.2.6 of GY/T 311—2017.

7.1.9 Filter
It should comply with the requirements in section 5.2.7 of GY/T 311—2017.

7.1.10 Reverberation Time Measuring Instrument
It should comply with the requirements in section 5.2.8 of GY/T 311—2017.

7.1.11 Sound Calibrator
It should comply with the requirements in section 5.2.9 of GY/T 311—2017.

7.1.12 Spectrum Analyzer
It should comply with the requirements in section 5.2.10 of GY/T 311—2017.

Measuring Signals

7.2.1 Resolution Measuring Signal
The full image resolution is 4,096×2,160 or 2,048×1,080, with a black background (signal encoding values X’=0, Y’=0, Z’=0). The measurement signal consists of 16×16 pixel color bar blocks arranged horizontally and vertically, starting from the top left corner of the image, as shown in Figure 2.

Figure 2 Resolution Measurement Signal

The color sequence of the color bar blocks and the signal encoding value requirements are shown in Table 2.

Table 2 Color Sequence of the Color Bar Blocks and Signal Encoding Value Requirements

The direction index alternates between dark gray (signal encoding values X’=1,018, Y’=1,051, Z’=1,111) and white (signal encoding values X’=3,794, Y’=3,960, Z’=3,890). The resolution measurement signal is divided into 4 sets of images, each set containing color bar blocks for only one direction, as shown in Figure 3.

Figure 3 Color Bar Blocks for Four Directions

7.2.2 White Field Measurement Signal
7.2.2.1 SDR
The measurement signal with signal encoding values of (X’=3,794, Y’=3,960, Z’=3,890).

7.2.2.2 HDR
The measurement signal with signal encoding values of (X”=2,524, Y”=2,546, Z”=2,583).

7.2.3 Black Field Measurement Signal
7.2.3.1 SDR
The measurement signal with signal encoding values of (X’=122, Y’=128, Z’=125).

7.2.3.2 HDR
The measurement signal with signal encoding values of (X”=60, Y”=62, Z”=65).

7.2.4 Red Field Measurement Signal
7.2.4.1 SDR
The measurement signal with signal encoding values of (X’=2,901, Y’=2,171, Z’=100).

7.2.4.2 HDR
The measurement signal with signal encoding values of (X”=2,234, Y”=1,925, Z”=68).

7.2.5 Green Field Measurement Signal
7.2.5.1 SDR
The measurement signal with signal encoding values of (X’=2,417, Y’=3,493, Z’=1,222).

7.2.5.2 HDR
The measurement signal with signal encoding values of (X”=1,988, Y”=2,387, Z”=1,327).

7.2.6 Blue Field Measurement Signal
7.2.6.1 SDR
The measurement signal with signal encoding values of (X’=2,014, Y’=1,416, Z’=3,816).

7.2.6.2 HDR
The measurement signal with signal encoding values of (X”=1,871, Y”=1,525, Z”=2,565).

7.2.7 “Black to White” Grayscale Measurement Signal
7.2.7.1 SDR
The measurement signal is divided into 10 groups of images, with the required signal encoding values listed in Table 3.

Table 3 Black to White Grayscale Measurement Signal (SDR) Encoding

7.2.7.2 HDR
The measurement signal is divided into 10 groups of images, with the required signal encoding values listed in Table 4.

Table 4 Black to White Grayscale Measurement Signal (HDR) Encoding Values

7.2.8 “Black to Dark Gray” Grayscale Measurement Signal
7.2.8.1 SDR
The measurement signal is divided into 10 groups of images, with the required signal encoding values listed in Table 5.

Table 5 Black to Dark Gray Grayscale Measurement Signal (SDR) Encoding ValuesTable 5 Black to Dark Gray Grayscale Measurement Signal (SDR) Encoding Values

7.2.8.2 HDR
The measurement signal is divided into 10 groups of images, with the required signal encoding values listed in Table 6.

Table 6 Black to Dark Gray Grayscale Measurement Signal (HDR) Encoding Values

7.2.9 In-Frame Contrast Measurement Signal
7.2.9.1 SDR
The entire image is evenly divided into 16 alternating white squares (encoding values X’=3,794, Y’=3,960, Z’=3,890) and black squares (encoding values X’=122, Y’=128, Z’=125) for the measurement signal. See Figure 4.

7.2.9.2 HDR
The entire image is evenly divided into 16 alternating white squares (encoding values X’’=2,524, Y’’=2,546, Z’’=2,583) and black squares (encoding values X’’=60, Y’’=62, Z’’=65) for the measurement signal. See Figure 4.

Figure 4 In-Frame Contrast Measurement Signal

7.2.10 Frame Rate Measurement Signal
The measurement signal is divided into 13 groups of movie clips. The content of the movie clips is not limited. The required film resolution and frame rate for each group of movie clips are listed in Table 7.

Table 7 Film Resolution and Frame Rate Requirements for Frame Rate Measurement Signal

7.3 Measurement Environment and Conditions
7.3.1 Measurement Environment
The requirements for the measurement environment are as follows:
a) Ambient temperature: 15°C to 35°C;
b) Relative humidity: 10% to 90%;
c) Atmospheric pressure: 86 kPa to 106 kPa;
d) Voltage amplitude: 220 V ±10 V AC;
e) Nominal frequency: 50 Hz.

7.3.2 Measurement Conditions
The requirements for the measurement conditions are as follows:
a) All measurements should be conducted under normal viewing conditions in the cinema;
b) All equipment should be in normal, stable working condition or configured according to the measurement requirements;
c) All measurement signals should be played and output to the LED display screen from a digital cinema playback server;

  1. d) The measurement of the optical system should be performed within the range where the color reproduction of the LED display screen’s center point is qualified;
    e) When measuring the optical system, the light output of the LED display screen should be stable (thermal stabilization time of no less than 20 minutes) and the 3D projection equipment should be stable (3D projection equipment should be exposed to light for no less than 15 minutes) before measurements are made;
    f) During optical system measurement, the optical measuring instrument should be positioned at the center of the seating area in the cinema, 1.15 meters above the selected seat’s floor level, with the measurement lens aligned with the center of the LED display screen and focused clearly;
    g) When measuring the 3D projection optical system, the 3D glasses should be placed horizontally in front of the optical measuring instrument’s lens, with the lenses perpendicular to the measurement axis and not obstructing the instrument’s measurement;
    h) Each time the acoustic measurement equipment is powered on, system calibration must be performed before the corresponding acoustic measurement can be conducted;
    i) When measuring the projection acoustic system, the microphone should be positioned at the seating area of the cinema, 1.15 meters above the selected seat’s floor level, with the microphone pointing towards the screen and tilted upward at a 45° angle. If the microphone is below the seat back height, it should be raised appropriately and extend about 0.15 meters above the seat back;
    j) When measuring the projection acoustic system, the spectrum analyzer/reverberation time measurement device should be placed outside the cinema to avoid interference from the noise emitted by the measuring instrument itself. Additionally, human-caused noise within the cinema should be avoided to ensure the accuracy of the measurement results.

Measurement Steps

7.4.1 Display Resolution
The measurement steps are as follows:
a) Project the resolution measurement signal;
b) Check whether the pixels of the LED display screen correspond one-to-one with the pixels of the measurement signal, and whether the received image signal is displayed correctly.

7.4.2 Center Point Brightness
The measurement steps are as follows:
a) Turn on the spectroradiometer;
b) Project a white field measurement signal;
c) Measure and record the center point brightness value of the LED display screen in the white field;
d) Measure and record the center point brightness value of the LED display screen in the white field at the center seat positions of the first and last rows, and at the leftmost and rightmost seats of the middle rows in the audience area.

7.4.3 Average Brightness of Full Screen
The measurement steps are as follows:
a) Turn on the imaging brightness meter;
b) Project a white field measurement signal;
c) Measure and record the average brightness of the full screen of the LED display screen.

7.4.4 Brightness Uniformity (Module)
The measurement steps are as follows:
a) Turn on the imaging brightness meter;
b) Project a white field measurement signal;
c) Measure and record the average white field brightness value La of each module of the LED display screen, as well as the center point brightness value L of the white field of the LED display screen;
d) Calculate the brightness uniformity (module) U using the formula (1), taking the worst value as the brightness uniformity (module) measurement result.

(1)In the formulapng

(1)In the formula:
U — Brightness uniformity (module);
La — The measured average brightness value of the white field for each module of the LED display screen;
L — The measured center point brightness value of the white field for the LED display screen.

7.4.5 Sequential Contrast
The measurement steps are as follows:
a) Measure the center point brightness value of the white field on the LED display screen according to section 7.4.2;
b) Turn on the spectroradiometer;
c) Project the black field measurement signal;
d) Measure and record the center point brightness value of the black field on the LED display screen;
e) The ratio of the center point brightness value of the white field to the center point brightness value of the black field is the sequential contrast.

7.4.6 In-Frame Contrast
The measurement steps are as follows:
a) Turn on the spectroradiometer;
b) Project the in-frame contrast measurement signal;
c) Measure the brightness values Lw at the center of the 8 white squares and the brightness values Lb at the center of the 8 black squares on the LED display screen;
d) Calculate the in-frame contrast Ci using formula (2);

(2)In the formula

(2)In the formula:
Ci — In-frame contrast;
Lw — Measured brightness value at the center of the white squares;
Lb — Measured brightness value at the center of the black squares.
7.4.7 Center Point Color Reproduction
The measurement steps are as follows:

  1. a) Turn on the spectroradiometer;
    b) Project the white field, red field, green field, and blue field measurement signals;
    c) Measure and record the chromaticity coordinates at the center point of the LED display screen;
    d) Measure and record the chromaticity coordinates at the center point of the LED display screen at the center seat positions of the first and last rows, and at the leftmost and rightmost seats of the middle rows in the audience area.

7.4.8 Chromaticity Uniformity (Module)
The measurement steps are as follows:
a) Turn on the imaging colorimeter;
b) Project the white field measurement signal;
c) Measure and record the average chromaticity coordinates for each module of the LED display screen and the chromaticity coordinates at the center point of the white field on the LED display screen;
d) Calculate the differences Δx Delta Δx and Δy Delta Δy between the average chromaticity coordinates for each module and the chromaticity coordinates at the center point of the white field on the LED display screen, taking the worst value as the measurement result.

7.4.9 Electro-Optical Conversion Characteristics
7.4.9.1 SDR Electro-Optical Conversion Characteristics
The measurement steps are as follows:
a) Turn on the spectroradiometer;
b) Project the “black to white” grayscale measurement signal and the “black to dark gray” grayscale measurement signal;
c) Measure the center point brightness value for each grayscale;
d) Fit a power curve between the image signal encoding values and the image brightness values using the least squares method, which gives the gamma.

7.4.9.2 HDR Electro-Optical Conversion Characteristics
The measurement steps are as follows:
a) Turn on the spectroradiometer;
b) Project the “black to white” grayscale measurement signal and the “black to dark gray” grayscale measurement signal;
c) Measure the center point brightness value for each grayscale;
d) Calculate the percentage difference between the measured center point brightness value for each grayscale and the corresponding reference output brightness Y from Table 4 and Table 6 for the grayscale measurement signal encoding values.

7.4.10 3D Projection Center Point Brightness
The measurement steps are as follows:
a) Turn on the spectroradiometer;
b) Set the LED display screen to 3D projection mode using 3D projection equipment;
c) Project the white field measurement signal for both left and right eyes simultaneously;
d) Measure the center point brightness value of the white field for the left eye Ll​ and the center point brightness value of the white field for the right eye Lr, through the left and right lenses of the

3D glasses, respectively;
e) Calculate and record the 3D projection center point brightness LLL for the LED display screen using formula

(3)In the formula

(3)In the formula:
L — 3D projection center point brightness;
Ll — Left eye center point brightness value of the white field when both left and right eyes are simultaneously projecting the white field measurement signal;
Lr — Right eye center point brightness value of the white field when both left and right eyes are simultaneously projecting the white field measurement signal.

7.4.11 Binocular Brightness Difference
The measurement steps are as follows:
a) Measure the left eye center point brightness value Ll and the right eye center point brightness value Lr following the measurement steps for 3D projection center point brightness in section 7.4.10;
b) Calculate and record the binocular brightness difference Ld using formula (4);

(4)In the formula

(4)In the formula:
Ld​ — Binocular brightness difference;
Ll — Left eye center point brightness value of the white field when both left and right eyes are simultaneously projecting the white field measurement signal;
Lr— Right eye center point brightness value of the white field when both left and right eyes are simultaneously projecting the white field measurement signal.

7.4.12 3D Projection Brightness Uniformity
The measurement steps are as follows:
a) Turn on the spectroradiometer;
b) Set the LED display screen to 3D projection mode using 3D projection equipment;
c) Simultaneously project the white field measurement signal for both the left and right eyes;
d) Through the left lens of the 3D glasses, measure and record the screen brightness values Ll at the upper, lower, left, and right edges of the white field, and the center point brightness value Ll. The measurement positions at the four edges should be at the center point location 5% from the adjacent screen edges;
e) Through the right lens of the 3D glasses, measure and record the screen brightness values Lr at the upper, lower, left, and right edges of the white field, and the center point brightness value Lr. The measurement positions at the four edges should be at the center point location 5% from the adjacent screen edges;
f) Calculate the left eye brightness uniformity Ul using formula (5), and take the worst value as the left eye’s brightness uniformity measurement result;

(5)In the formula

(5)In the formula:
Ul — Left eye brightness uniformity;
Lls — Screen brightness value at the four edges of the white field for the left eye when both the left and right eyes are simultaneously projecting the white field measurement signal;
Ll — Center point brightness value of the white field for the left eye when both the left and right eyes are simultaneously projecting the white field measurement signal;
g) Calculate the right eye brightness uniformity Ur using formula (6), and take the worst value as the right eye’s brightness uniformity measurement result;

(6)In the formula

(6)In the formula:
Ur — Right eye brightness uniformity;
Lrs — Screen brightness value at the four edges of the white field for the right eye when both the left and right eyes are simultaneously projecting the white field measurement signal;
Lr — Center point brightness value of the white field for the right eye when both the left and right eyes are simultaneously projecting the white field measurement signal;

7.4.13 3D Projection Center Point White Field Chromaticity Coordinates
The measurement steps are as follows:
a) Turn on the spectroradiometer;
b) Set the LED display screen to 3D projection mode using 3D projection equipment;
c) Simultaneously project the white field signal for both the left and right eyes;
d) Through the left and right lenses of the 3D glasses, measure and record the chromaticity coordinates of the 3D projection center point white field on the LED display screen.

7.4.14 3D Projection Extinction Ratio
The measurement steps are as follows:
a) Turn on the spectroradiometer;
b) Set the LED display screen to 3D projection mode using 3D projection equipment;
c) Project the white field measurement signal for the left eye and the black field measurement signal for the right eye;
d) Through the left lens of the 3D glasses, measure and record the white field center point brightness value LIlw;
e) Through the right lens of the 3D glasses, measure and record the black field center point brightness value LIrb;
f) Project the black field measurement signal for the left eye and the white field measurement signal for the right eye;
g) Through the left lens of the 3D glasses, measure and record the black field center point brightness value LIlb;
h) Through the right lens of the 3D glasses, measure and record the white field center point

brightness value LIrb;
i) Calculate and record the left eye 3D projection extinction ratio Il using formula (7);

(7)In the formula

(7)In the formula:
Il  — Left eye 3D projection extinction ratio;
LIrb  — Left eye black field center point brightness value when the left eye projects a black field measurement signal and the right eye projects a white field measurement signal;
LIlw — Left eye white field center point brightness value when the left eye projects a white field measurement signal and the right eye projects a black field measurement signal;
j) Calculate and record the right eye image 3D projection extinction ratio Ir using formula (8);

(8)In the formula

(8)In the formula:
Ir — Right eye 3D projection extinction ratio;
LIlb — Right eye black field center point brightness value when the left eye projects a white field measurement signal and the right eye projects a black field measurement signal;
LIlw — Right eye white field center point brightness value when the left eye projects a black field measurement signal and the right eye projects a white field measurement signal.

7.4.15 Screen Surface Reflectance

7.4.15.1 Diffuse Reflectance
The measurement steps are as follows:
a) Turn off the LED display;
b) Use a reflectance meter to measure closely on the LED display;
c) Measurements should be taken at multiple locations on the LED display;
d) Calculate the average value of all measurements for each wavelength and plot the diffuse reflectance average curve;
e) Record the worst value of the LED display’s diffuse reflectance as the measurement result.

7.4.15.2 Specular Reflectance
The measurement steps are as follows:
a) Turn off the LED display;
b) Use a reflectance meter to measure closely on the LED display;
c) Measurements should be taken at multiple locations on the LED display;
d) Calculate the average value of all measurements for each wavelength and plot the specular reflectance average curve;
e) Record the worst value of the LED display’s specular reflectance as the measurement result.

7.4.16 Pixel Visibility
The measurement steps are as follows: 

  1. a) Display the resolution measurement signal;
    b) Check from the first row of seats to see if the pixel structure and noticeable dark areas between pixels on the LED display are visible.

7.4.17 Image Scaling
The measurement steps are as follows:
a) Display the resolution measurement signal;
b) Check from the first row of seats to see if visible image scaling artifacts are present on the LED display.

7.4.18 Subpixel Spatial Consistency
The measurement steps are as follows:
a) Display the resolution measurement signal;
b) Check from the first row of seats to see if geometric abnormalities in subpixel spatial arrangement, such as edge or checkerboard artifacts, are visible on the LED display.

7.4.19 Temporal and Spatial Aliasing
The measurement steps are as follows:
a) Display the resolution measurement signal;
b) Check from the first row of seats to see if visible artifacts caused by pixel multiplexing or scanning appear on the LED display.

7.4.20 Jitter
The measurement steps are as follows:
a) Display the black field measurement signal;
b) Check from the first row of seats to see if pixel jitter is visible on the LED display.

7.4.21 Pixel Defects
The measurement steps are as follows:
a) Display resolution, white, black, red, green, and blue field measurement signals;
b) Check from the first row of seats to see if any pixel defects are visible on the LED display, including dead pixels, color defects, color blocks, bright spots, dark spots, bright lines, dark lines, seams, and horizontal or vertical pixel misalignment.

7.4.22 Frame Rate
The measurement steps are as follows:
a) Display the frame rate measurement signal;
b) Check if the digital cinema LED projection system is playing normally.

7.4.23 Reverberation Time (RT60)
The measurement should be conducted according to the measurement steps specified in section 5.3.9 of GY/T 311—2017.

7.4.24 Reverberation Time Frequency Characteristics
The measurement should be conducted according to the measurement steps specified in section 5.3.9 of GY/T 311—2017.

7.4.25 Background Noise
The measurement should be conducted according to the measurement steps specified in section 5.3.10 of GY/T 311—2017.

7.4.26 Sound Insulation
The measurement should be conducted according to the measurement steps specified in section 5.3.11 of GY/T 311—2017.

7.4.27 Sound Field Distribution
The measurement should be conducted according to the measurement steps specified in section 5.3.12 of GY/T 311—2017

7.4.28 Electroacoustic Response Characteristics
The measurement should be conducted according to the measurement steps specified in chapter 3 of GY/T 312—2017.

References

[1] GB/T 36617—2018, Digital Cinema Quality: Screen Brightness, Chromaticity, and Uniformity.

[2] DY/T 1—2020, Technical Requirements and Measurement Methods for Digital Cinema Stereoscopic Projection.

[3] SJ/T 11141—2017, General Specifications for LED (Light Emitting Diode) Display Screens.

[4] ISO 5926:2023, Technical Requirements and Test Methods for Digital Cinema Stereoscopic Projection.

[5] DCI, High Dynamic Range D-Cinema Addendum, Version 1.1.

[6] DCI, Direct View Display D-Cinema Addendum, Version 1.1.

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