GY/T 331-2020High-definition television sound recognition and calibration signal technical requirements (English PDF)
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Issued by
State Administration of Radio and Television
Level / Type
National · Recommended
Issue date
September 4, 2020
Implementation date
September 4, 2020
Scope
GY/T 331-2020 (High-definition television sound recognition and calibration signal technical requirements) is available as an English-translated PDF.
GY/T 331-2020 — This standard specifies the technical requirements for audio identification and calibration signals required in the production and broadcasting of high-definition television programs and transmission link testing.
This standard applies to the production, exchange, broadcasting and transmission of high-definition television programs.
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Document preview — GY/T 331-2020
National Standard of the People's Republic of China
Issued by: State Administration of Radio and Television
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Abbreviations
- 4 Technical requirements
- 4.1 Stereo recognition and calibration signal
- 4.2 Surround sound recognition and calibration signal
- 4.3 Multilingual application recognition and calibration signal
- 4.4 Identification and calibration signal quality requirements
- 5 Identification and calibration signal usage requirements
- Appendix A (Normative Appendix) Identification and Calibration Signal Definition
- A.1 GLITS signal
- A.2 Timing Circle signal
- A.3 Correspondence between GLITS signal and Timing Circle signal
- A.4 Scroll Bar signal
- Appendix B (informative appendix) Instructions for use of surround sound recognition and calibration signals
- B.1 Overview
- B.2 Signal Usage Instructions
- References
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents.
This standard is under the jurisdiction of the National Radio, Film and Television Standardization Technical Committee (SAC/TC 239).
Drafting organizations of this standard. China Central Radio and Television General Station, National Radio and Television Planning Institute.
1 Scope
This standard specifies the technical requirements for audio identification and calibration signals required in the production and broadcasting of high-definition television programs and transmission link testing.
This standard applies to the production, exchange, broadcasting and transmission of high-definition television programs.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document.
For undated references, the latest version (including all amendments) applies to this document.
GY/T 192-2003 Full-scale level of digital audio equipment GY/T 313-2017 High Definition Television Program Recording Specification
3 Abbreviations
The following abbreviations apply to this document.
GLITS Grignard calibration to identify tone sequences BLITS Blackline surround sound calibration recognizes pitch sequence
4 Technical requirements
4.1 Stereo recognition and calibration signal
4.1.1 Signal type
Two-channel stereo test signal.
4.1.2 Schematic diagram of signal video
The video schematic diagram of the stereo recognition and calibration signal is shown in Figure 1, and the content location diagram is shown in Figure 2.
Figure 1 Schematic diagram of stereo recognition and calibration signal video
Figure 2 The position of the video content of the stereo recognition and calibration signal
See Table 1 for the illustration of the position map of the stereo recognition and calibration signal video content.
4.1.3 Signal channel content
4.1.3.1 Channel content information
The channel content information includes three parts. identification signal, calibration signal and sound and picture synchronization test signal (see Figure 3).
a) Recognition signal. The English voice broadcast content of this channel is.
b) Calibration signal. CH1 to CH4 are all sine wave signals with a frequency of 1kHz and an amplitude of -20dBFS.
c) Sound and picture synchronization test signal. GLITS signal, see A.1.
4.1.3.2 Schematic diagram of channel content
Figure 3 shows a schematic diagram of the channel content of the stereo recognition and calibration signal.
Figure 3 Schematic diagram of stereo recognition and calibration signal channel content
4.1.4 How to use signals
The signal is played cyclically with a cycle of 28s. The test is carried out in the order of first identification and then calibration, and after the identification and calibration of each channel is completed Sound and picture synchronization test.
CH1 to CH4 are identified and calibrated in sequence. The test time of each channel lasts for 4s. The first 2s is the identification signal, and the last 2s is the calibration signal, complete the process of identification and calibration lasts 16s (0s~16s).
The four channels are paired in pairs according to the odd and even channels, and the GLITS signal and Timing Circle signal of three cycles are used at the same time, and the Scroll Bar the signal is for reference, and the sound and picture synchronization test is carried out. The test process lasts for 12s (16s~28s), see Appendix A.
4.2 Surround sound recognition and calibration signal
4.2.1 Signal type
Eight-channel surround sound test signal.
4.2.2 Schematic diagram of signal video
The video schematic diagram of the surround sound recognition and calibration signal is shown in Figure 4, and the content location diagram is shown in Figure 5.
Figure 4 Schematic diagram of surround sound recognition and calibration signal video
Figure 5 Video content location map of surround sound recognition and calibration signal
See Table 2 for the illustration of the video content location diagram of the surround sound recognition and calibration signal.
4.2.3 Signal channel content
4.2.3.1 Channel content information
The channel content information includes three parts. identification signal, calibration signal and sound and picture synchronization test signal (see Figure 6).
a) Recognition signal. The English voice broadcast content of this channel is.
b) Calibration signal. According to the BLITS signal, CH1 and CH2 are sine wave signals with a frequency of 880 Hz and an amplitude of -20 dBFS. CH3 is a frequency of 1320Hz, Sine wave signal with amplitude -20dBFS. CH4 is a sine wave signal with a frequency of 82.5 Hz and an amplitude of -20 dBFS. CH5 and CH6 have a frequency of 660 Hz, Sine wave signal with amplitude -20dBFS. CH7 and CH8 are sine wave signals with a frequency of 1kHz and an amplitude of -20dBFS. At this time, CH1 to CH6 are for a sine wave signal with a frequency of 2kHz and an amplitude of -26dBFS, see Appendix B.
c) Sound and picture synchronization test signal. GLITS signal, see A.1.
4.2.3.2 Schematic diagram of channel content
See Figure 6 for a schematic diagram of surround sound recognition and calibration signal channel content.
Figure 6 Schematic diagram of surround sound recognition and calibration signal channel content
4.2.4 Signal usage method
4.2.4.1 Overview
The signal is played cyclically with a cycle of 44s. The test is carried out in the order of first identification and then calibration, and after the identification and calibration of each channel is completed Sound and picture synchronization test. Refer to Appendix B for surround sound recognition and calibration signal usage instructions.
4.2.4.2 Using stereo and surround sound separation production method
CH1 to CH8 are identified and calibrated in sequence. The test time of each channel lasts for 4s. The first 2s is the identification signal, and the last 2s is the calibration signal, complete the identification and calibration process lasts 32s (0s~32s).
The eight channels are paired in pairs according to the odd and even channels, and the GLITS signal and Timing Circle signal of three cycles are used at the same time, and the Scroll Bar the signal is for reference, and the sound and picture synchronization test is carried out. The test process lasts for 12s (32s~44s), see Appendix A.
4.2.4.3 The method of downmixing stereo production using surround sound CH1 to CH6 are identified and calibrated in sequence. The test time of each channel lasts for 4s. The first 2s is the identification signal, and the last 2s is the calibration signal (0s~ 24s), and complete the recognition of seven and eight channels at the same time. The calibration signal of the seven and eight channels is a sine wave signal with a frequency of 2kHz and an amplitude of -20dBFs (25s ~32s).
The eight channels are paired in pairs according to the odd and even channels, and the GLITS signal and Timing Circle signal of three cycles are used at the same time, and the Scroll Bar the signal is for reference, and the sound and picture synchronization test is carried out. The test process lasts for 12s (32s~44s), see Appendix A.
4.3 Multilingual application recognition and calibration signal
4.3.1 Signal type
Eight-channel multilingual application test signal.
4.3.2 Schematic diagram of signal video
The video schematic diagram of multilingual application recognition and calibration signal is shown in Figure 7, and the content location diagram is shown in Figure 8.
Figure 7 Video schematic diagram of multilingual application recognition and calibration signal
Figure 8 Video content location map of multilingual application recognition and calibration signal
Multilingual application identification and calibration signal video content location diagram illustrated in Table 3.
4.3.3 Signal channel content
4.3.3.1 Channel content information
The channel content information includes three parts. identification signal, calibration signal and sound and picture synchronization test signal (see Figure 9).
a) Recognition signal. The English voice broadcast content of this channel is.
b) Calibration signal. a sine wave signal with a frequency of 1kHz and an amplitude of -20dBFS lasting 2s.
c) Sound and picture synchronization test signal. GLITS signal, see A.1.
4.3.3.2 Schematic diagram of channel content
Figure 9 shows a schematic diagram of multilingual application recognition and calibration signal channel content.
Figure 9 Schematic diagram of multilingual application recognition and calibration signal channel content
4.3.4 Signal usage method
The signal is played cyclically with a cycle of 44s. The test is carried out in the order of first identification and then calibration, and after the identification and calibration of each channel is completed Sound and picture synchronization test.
CH1 to CH8 are identified and calibrated in sequence. The test time of each channel lasts for 4s. The first 2s is the identification signal, and the last 2s is the calibration signal, complete the identification and calibration process lasts 32s (0s~32s).
The eight channels are paired in pairs according to the odd and even channels, and the GLITS signal and Timing Circle signal of three cycles are used at the same time, and the Scroll Bar the signal is for reference, and the sound and picture synchronization test is carried out. The test process lasts for 12s (32s~44s), see Appendix A.
4.4 Identification and calibration signal quality requirements
The quality of the identification calibration signal should be ensured, including the integrity of the signal, the amplitude range of the level, and the synchronization of sound and picture.
5 Identification and calibration signal usage requirements
The audio-visual system using identification and calibration signals should meet the requirements of GY/T 192-2003 for full-scale level values.
The audiovisual system using identification and calibration signals shall meet the requirements for audio recording in GY/T 313-2017.
Appendix A
(Normative appendix) Identification and calibration signal definition Appendix B (Informative appendix) Surround sound recognition and calibration signal instructions B.1 Overview Considering that the surround sound recognition and calibration signal can be used in two different production methods at the same time, in order to ensure the consistency and integrity of the signal production Therefore, the use of this signal is divided into the following two ways.
B.2 Signal usage instructions B.2.1 Using stereo and surround sound separation production method the video system uses the same video playback source, and the audio is produced by separating stereo and surround sound. Stereo and surround sound separation the schematic diagram of the production method is shown in Figure B.1.
In this scenario, within a signal period, the 0s~24s identification and calibration signal is only used for surround sound production system testing, and the 24s~32s identification and calibration signal the calibration signal is only used for the test of the stereo production system. The 32s~44s identification and calibration signal can be applied to two systems for testing at the same time.
Figure B.1 Schematic diagram of the production method of separating stereo and surround sound
B.2.2 Using surround sound to downmix stereo production the video system uses the same video playback source, and the audio is produced using surround sound downmixing stereo. Surround sound downmix stereo production the schematic diagram is shown in Figure B.2.
Use 4.2.4.3 Note downmix to calculate the attenuation. Within one signal period, the content of the downmix stereo channel (CH7, CH8 channel) is presented for.
--0s~2s CH7 channel content is Left Channel, CH8 channel content is empty;
--2s~4s CH7 channel content is sine wave signal with frequency 880Hz and amplitude -20dBFS, CH8 channel content is empty;
--4s~6s CH7 channel content is empty, CH8 channel content is Right Channel;
--6s~8s CH7 channel content is empty, CH8 channel content is sine wave signal with frequency 880Hz and amplitude -20dBFS
--8s~10s CH7 channel content is Center Channel, CH8 channel content Center Channel;
--10s~12s CH7 channel content is a sine wave signal with frequency 1320Hz and amplitude -23dBFS, CH7 channel content is frequency 1320Hz, Sine wave signal with amplitude -23dBFS;
--12s~14s CH7 channel content is empty, CH8 channel content is empty;
--14s~16s CH7 channel content is empty, CH8 channel content is empty;
--16s~18s CH7 channel content is Left Surround Channel, CH8 channel content is empty;
--18s~20s CH7 channel content is a sine wave signal with frequency 660Hz and amplitude -23dBFS, and CH8 channel content is empty;
--20s~22s CH7 channel content is empty, CH8 channel content is Right Surround Channel;
--22s~24s CH7 channel content is empty, CH8 channel content is a sine wave signal with frequency 660Hz and amplitude -23dBFS;
--24s~32s CH7 channel content is a sine wave signal with frequency 1kHz and amplitude -20dBFS, CH8 channel content is frequency 1kHz, amplitude-20dBFS sine wave signal.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 16 pages — is available in the English PDF.
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