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GY/T 323-2019: Technical requirements and measurement methods of AVS2 encoder for 4K UHDTV
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Technical requirements and measurement methods of AVS2 encoder for 4K UHDTV
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Basic data | Standard ID | GY/T 323-2019 (GY/T323-2019) | | Description (Translated English) | Technical requirements and measurement methods of AVS2 encoder for 4K UHDTV | | Sector / Industry | Radio, Film & TV Industry Standard (Recommended) | | Classification of Chinese Standard | M61 | | Word Count Estimation | 19,186 | | Date of Issue | 2019 | | Date of Implementation | 2019-09-05 | | Issuing agency(ies) | State Administration of Radio and Television | GY/T 323-2019: Technical requirements and measurement methods of AVS2 encoder for 4K UHDTV---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(AVS2 4K Ultra HD Encoder Technical Requirements and Measurement Methods)
GY
Radio and Television Industry Standards of the People's Republic of China
AVS2 4K Ultra HD encoder technical requirements and measurement methods
Technical requirements and measurement methods of AVS2 encoder for 4K UHDTV
2019-09-05 posted
2019-09-05 Implementation
Published by the State Administration of Radio and Television
Contents
Foreword ... II
1 Scope ... 1
2 Normative references ... 1
3 Acronyms ... 1
4 Technical requirements ... 2
4.1 Transport Stream Standard Compliance ... 2
4.2 Transport Stream Performance Requirements ... 4
4.3 TS over IP flow encapsulation requirements ... 5
4.4 IP output performance requirements ... 5
4.5 Basic Stream Standard Compliance ... 6
4.6 Video and Audio Bit Rate Fluctuations ... 7
4.7 Functional and physical interface requirements ... 7
4.8 ASI output interface technical requirements ... 8
4.9 Total codec delay ... 8
4.10 Power-on startup delay ... 8
4.11 Relative Delay of Audio and Video ... 8
4.12 Video technical requirements ... 8
4.13 Audio Technical Requirements ... 9
4.14 Encoder image quality requirements ... 10
5 Measurement method ... 10
5.1 Measuring environmental conditions ... 10
5.2 Encoder bit rate measurement settings ... 10
5.3 Reference decoder for measurement ... 10
5.4 Measurement of Transport Stream Standard Compliance and Performance ... 11
5.5 Measurement of TS over IP Stream Encapsulation and Output Performance ... 11
5.6 Basic Stream Standard Compliance and Video and Audio Bit Rate Fluctuation Measurements ... 11
5.7 Measurement of ASI Output Interface Technical Specifications ... 12
5.8 Measurement of total codec delay ... 12
5.9 Measurement of Power-on Startup Delay ... 12
5.10 Measurement of relative delay of audio and video ... 13
5.11 Measurement of video technical indicators ... 13
5.12 Audio technical indicators measurement ... 14
5.13 Subjective evaluation of image quality ... 15
References ... 16
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
Please note that some elements of this standard may involve patents. The issuer of this standard 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).
This standard was drafted. Radio and Television Planning Institute of the State Administration of Radio and Television, Central Radio and Television Station, and the State Administration of Radio and Television
Institute of Television Science, Supervision Center of State Administration of Radio and Television, Central Digital Television Media Co., Ltd., Zhongguancun Audiovisual Industry Technology Innovation
Alliance, Guangdong Radio and Television Station, Shanghai Jiaotong University, Beijing Mudan Shiyuan Electronics Co., Ltd., Shenzhen Longgang Intelligent Audiovisual Research Institute,
Guangzhou Keweixin Digital Technology Co., Ltd., Shanghai Guomao Digital Technology Co., Ltd., Beijing Digital Video Technology Co., Ltd., Hangzhou Dang
Hong Technology Co., Ltd., Beijing Jiawei Communication Electronic Technology Co., Ltd., Beijing Liujin Years Culture Communication Co., Ltd., Shenzhen
Hisilicon Semiconductor Co., Ltd. and Shanghai Zhaoxin Integrated Circuit Co., Ltd.
The main drafters of this standard. Wang Huiming, Dong Wenhui, Ge Tao, Deng Xiangdong, Pan Xiaofei, Ning Jinhui, Guo Xiaoqiang, Fan Xiaoting, Xu Hui,
Zhang Qian, Zhang Jiandong, Zhou Yun, Wei Na, Li Chen, Wang Haixu, Jin Daqian, Fan Chuangqi, Lin Xiaohai, Yang Xiaokang, Zhang Weimin, Wang Banghu, Zeng
Zhihua, Zou Jianyu, Zhao Haiwu, Chen Yong, Shou Hailong, Zeng Zejun, Li Zhongliang, Long Shiqiang, and Chen Ruiyang.
AVS2 4K Ultra HD encoder technical requirements and measurement methods
1 Scope
This standard specifies the main technical requirements and measurement of 4K UHD encoders for video encoding using GY/T 299.1-2016 (referred to as AVS2).
This standard is applicable to the development, production, application, testing and operation of AVS2 4K ultra-high-definition real-time encoder accessed by SDI for broadcast and television professionals.
Line maintenance.
2 Normative references
The following documents are essential for the application of this document. For dated references, only the dated version applies to this document.
For undated references, the latest version (including all amendments) applies to this document.
GB/T 17191.3 Information technology. Encoding of moving images and accompanying sounds on digital storage media with a data transfer rate of 1.5 Mbit/s
Part 3. Audio
GB/T 17975.1-2010 Information technology. Universal coding of moving pictures and associated audio information. Part 1. System
GB/T 22726 Multi-channel Digital Audio Codec Technical Specification
GB/T 32631 High Definition TV 3Gbps Serial Data Interface and Source Image Format Mapping
GB/T 33475.3 Information technology efficient multimedia coding. Part 3. Audio
GY/T 134 Digital TV image quality subjective evaluation method
GY/T 170-2001 Cable Digital TV Broadcasting Channel Coding and Modulation Specification
GY/T 299.1-2016 High-efficiency audio and video coding Part 1. Video
GY/T 307-2017 Ultra high definition television system program production and exchange parameter values
GY/T 315-2018 High dynamic range TV program production and exchange of image parameter values
T/AVS 106-2018 Efficient Audio and Video Coding Part 1. Video
ETSI TR 101 290 Measurement guidelines for DVB systems
ETSI TS 101 154 v1.9.1 Technical Requirements for MPEG-2 Video and Audio Coding in Broadcast and Television Applications
use of video and audio coding in broadcasting applications based on the MPEG-2 transport stream)
ETSI TS 102 366 v1.4.1 Digital Audio Compression Standard (AC-3 and Enhanced AC-3)
(AC-3, enhanced AC-3) standard)
SMPTE ST 425-1..2017 3Gb/s serial interface source image format and auxiliary data mapping (Source Image Format and
Ancillary Data Mapping for the 3 Gb/s Serial Interface)
SMPTE ST 425-5..2015 4-link 3Gb/s serial interface source image format and auxiliary data mapping (Image Format and
Ancillary Data Mapping for the Quad Link 3 Gb/s Serial Interface)
SMPTE ST 2081-1..2015 6 Gb/s signal/data serial interface
SMPTE ST 2082-1..2015 12 Gb/s signal/data serial interface
3 Acronyms
The following abbreviations apply to this document.
AC-3 Surround Coding Digital Audio Coding (Audio Coding generation 3)
ASI Asynchronous Serial Interface
CBR Constant Bitrate
CRC Cyclic Redundancy Check
DVB Digital Video Broadcasting
ETSI European Telecommunications Standards Institute
MPEG Moving Picture Experts Group
PAT Program Association Table
PCR Program Clock Reference
PMT Program Map Table
PTS Presentation Time Stamps
SDI Serial Digital Interface
SQD Square Division
TS Transport Stream
UDP User Datagram Protocol
UHDTV Ultra High Definition Television
2SI 2 Sample Interleave
3G-SDI 3Gb/s Serial Digital Interface
6G-SDI 6Gb/s Serial Digital Interface
12G-SDI 12Gb/s Serial Digital Interface
4 Technical requirements
4.1 Transport Stream Standard Compliance
4.1.1 General requirements
The syntax and semantics of the transport stream and transport stream packet layer shall comply with the provisions of 2.4.3 in GB/T 17975.1-2010.
The grammatical structure of PAT should comply with the provisions of 2.4.5.3 in GB/T 17975.1-2010.
The syntax structure of the PMT shall comply with the provisions of 2.4.5.8 in GB/T 17975.1-2010.
The setting of table_id should meet the requirements of Table 34 in GB/T 17975.1-2010.
If the transport stream contains the stream type in Table 1, the assignment of stream_id in PES shall comply with the corresponding provisions in Table 1.
Table 1 stream_id assignment
Assignment of ordinal stream type stream_id
1 GY/T 299.1-2016 video (AVS2 video) 1110 xxxx
2 GB/T 17191.3 audio (MPEG-1 layer II audio) 110x xxxx
3 GB/T 33475.3 audio 1101 xxxx
4 GB/T 22726 audio 1011 1101
5 Dolby AC-3 audio 1011 1101
Note. The symbol x indicates that either '0' or '1' is allowed and can produce the same stream type. The stream number is determined by the value of x.
4.1.2 Requirements for the fields in the transport stream packet layer
The assignment of each field in the transport stream packet layer shall conform to the requirements in Table 2.
Table 2 Assignment of each field in the transport stream packet layer
Assignment of ordinal field name bit value
1 sync_byte 8 0x47
2 transport_error_indicator 1
3 payload_unit_start_indicator 1
4 transport_priority 1 user-defined
5 PID 13 meets the requirements of Table 6 in GB/T 17975.1-2010
6 transport_scrambling_control 2 00
7 adaptation_field_control 2 Meets the requirements of Table 8 in GB/T 17975.1-2010
8 continuity_counter 4
4.1.3 Assignment of fields in PAT
The assignment of each field in the PAT shall comply with the requirements in Table 3.
Table 3 Assignment of each field in PAT
Assignment of ordinal field name bit value
1 table_id 8 0x00
2 section_syntax_indicator 1 1
3 '0' 1 0
4 Reserved 2
5 section_length 12 The first two bits are set to 00, and the assignment range is 9 to 1021.
6 transport_stream_id 16 user-defined
7 Reserved 2
8 version_number 5
9 current_next_indicator 1
10 section_number 8
11 last_section_number 8
12 program_number 16 user defined
13 Network 13
Used only with program_number with value 0x0000, value assignment
Should meet the requirements of Table 6 in GB/T 17975.1-2010
14 Reserved 3
15 program_map_PID 13 Meets the requirements of Table 6 in GB/T 17975.1-2010
4.1.4 Assignment of various fields in PMT
The assignment of each field in the PMT shall meet the requirements of Table 4. Among them, the stream_type field and descriptor of the video stream and audio stream shall be in accordance with
The flow types in Table 5 are assigned accordingly.
Table 4 Assignment of various fields in PMT
Assignment of ordinal field name bit value
1 table_id 8 0x02
2 section_syntax_indicator 1 1
3 '0' 1 0
4 Reserved 2
5 section_length 12 The first two bits are set to 00, and the assignment range is 9 to 1021.
6 program_number 16 User-defined
7 reserved 2
8 version_number 5
9 current_next_indicator 1
10 section_number 8
11 last_section_number 8
12 reserved 3
13 PCR_PID 13 The value is 0x0020 ～ 0x1FFE, or 0x1FFF.
14 reserved 4
15 program_info_length 12 The first two bits are set to 00
16 stream_type 8 assignment should meet the requirements of Table 5
17 reserved 3
18 elementary_PID 13
The value is defined by the user, but the assignment should not include 0x0000 ～
0x001F, 0x1FFF
19 reserved 4
20 ES_info_length 12 The first two bits are set to 00
Table 5 Stream type assignment
Ordinal stream type stream_type assignment descriptor
1 GY/T 299.1-2016 video (AVS2 video) 0xD2
Should be equipped with a descriptor_tag of 0x40
AVS2_video_descriptor
2 GB/T 17191.3 audio (MPEG-1 audio) 0x03
3 GB/T 33475.3 Audio 0xD3
4 GB/T 22726 audio 0x06
Should be equipped with a descriptor_tag of 0xA0
DRA Audio Standard Descriptor
5 Dolby AC-3 audio 0x06
Should be equipped with a descriptor_tag of 0x6A
AC-3_descriptor (DVB)
a The profile_id field in this descriptor shall be 0x22.
4.2 Transport Stream Performance Requirements
4.2.1 Technical Requirements for PCR, Table Repeat Interval, and PTS Interval
The technical requirements for PCR, table repeat interval, and PTS interval are shown in Table 6.
Table 6 Technical requirements for PCR, table repeat interval, and PTS interval
Project technical indicators
1 PCR jitter -500ns ～ 500ns
2 PAT repeat interval ≤500ms
3 PMT repeat interval ≤500ms
4 PTS repeat interval ≤700ms
5 PCR repeat interval ≤40ms
4.2.2 Technical requirements for continuous and periodic monitoring of transport streams
Monitor the encoder-related instructions defined in ETSI TR 101 290. See Table 7 for specific technical requirements.
Table 7 Technical requirements for continuous and periodic monitoring of transport streams
Item
Technical index
First level
1 TS synchronization loss (TS_sync_loss) 0
2 Sync byte error (Sync_byte_error) 0
3 PAT error (PAT_error) 0
4 Continuity_count_error 0
5 PMT error (PMT_error) 0
6 PMT error 2 (PMT_error_2) 0
7 PID error (PID_error) 0
Secondary
1 CRC error (CRC_error) 0
2 PCR error (PCR_error) 0
3 PCR repetition error (PCR_repetition_error) 0
4 PCR discontinuity indication error (PCR_discontinuity_indicator_error) 0
5 PCR accuracy error (PCR_accuracy_error) 0
6 PTS error (PTS_error) 0
4.3 TS over IP flow encapsulation requirements
TS over IP flows transmitted through the Ethernet interface should directly encapsulate TS packets into UDP packets, and each UDP packet should encapsulate 1 to 7 TS packets (each
The packet length of each TS packet is 188 bytes). In order to improve the transmission efficiency, each UDP packet should encapsulate 7 TS packets.
4.4 IP output performance requirements
See Table 8 for IP output performance technical requirements.
Table 8 Technical requirements for IP output performance
No. parameter parameter value
1 Delay factor ≤ 5ms
2 Packet loss rate 0
4.5 Basic Stream Standard Compliance
4.5.1 Video encoding requirements
The syntax and semantics of video coding meet the requirements of GY/T 299.1-2016.
4.5.2 AVS2 encoding class and level requirements
See Table 9 for AVS2 encoding class and level requirements.
Table 9 AVS2 encoding class and level requirements
Class level
Maximum bit rate
Mbps
Required/optional
Benchmark 10-bit class
(Profile_id has a value of 0x22)
8.0.60 40 required
8.2.60 160 optional
8.0.120 60 optional
8.2.120 240 optional
4.5.3 Video format requirements for coded stream
See Table 10 for the video format requirements of the coded bitstream.
Table 10 Video format requirements for coded bitstream
Number parameter parameter value required/optional
1 Required for horizontal size 3840 pixels
2 Required for vertical size 2160 pixels
3 Aspect ratio 16. 9 Required
4 Frame rate 50Hz (progressive) required
5 Chroma Format 4. 2. 0 Required
6 Sampling accuracy 10bit required
7 color gamut
Supports the color gamut specified by GY/T 315-2018 and GY/T 307-2017, which can be set manually
Color gamut identification in the output stream, and meets the requirements of Table 43 in T/AVS 106-2018
Must
8 Dynamic range
Supports non-linear transfer functions specified by GY/T 315-2018 and GY/T 307-2017, but
Manually set the identification of the non-linear transfer function of the output code stream and comply with T/AVS 106-2018
Regulations of Table 44
Must
9 GOP length supports 24 frames, adjustable from 8 to 96 frames (step size is 8 frames)
10 CBR encoding is required to support CBR bit rate mode
4.5.4 Audio encoding requirements
See Table 11 for audio encoding requirements.
Table 11 Audio encoding requirements
Encoding standard conforms to channel support
Bit rate support
kbps
Input sampling frequency
kHz
Output sampling frequency
kHz
Sampling accuracy
bit
Must /
Optional
MPEG-1 layer II GB/T 17191.3 dual and stereo 256 48 48 16 required
AVS2 Audio GB/T 33475.3
Two-channel and stereo
Typical code rate should
Support 96
48 48 16 optional 5.1
Typical code rate should
Support 256
7.1
Typical code rate should
Support 384
AC-3
ETSI TS 102
366 v1.4.1
5.1 384, 448 48 48 16 optional
DRA GB/T 22726 5.1 384, 448 48 48 16 optional
The STB audio buffer size for AC-3 is defined by 4.1.8.20 in ETSI TS 101 154 v1.9.1.
4.6 Video and audio bit rate fluctuations
In the CBR-encoded transport stream, after setting the effective video and audio target bit rate, the maximum effective video and audio bit rate should not be greater than the set target
The minimum value of the standard value is 101%, and the minimum effective video and audio code rate should not be less than 97% of the set target value.
4.7 Functional and physical interface requirements
See Table 12 for functional and physical interface requirements.
Table 12 Functional and physical interface requirements
Technical requirements of the project
1 Transport stream packet length The output format of the transport stream should support a 188-byte packet length.
2 4 × 3G-SDI input interface
4-link digital video 3G-SDI (GB/T 32631/SMPTE ST 425-5..2015) input connector
Interface, the interface type is BNC, 75, and supports 2SI and SQD mapping methods; supports GB/T
32631 mode A and mode B; support at least 6 channels of embedded audio
Must
3 ASI output interface ASI output interface, at least 2 serial numbers 3 and
No. 4 to
Less of it
One kind
4 IP output interface at least 2, support RJ45, support TS over IP, support unicast and multicast
Extraction of HDR and color gamut identification
And transmission
The encoder supports SMPTE ST 425-1..2017 HDR for 4 × 3G-SDI input signals
And color gamut identification, and embedded according to the provisions of Table 43 and Table 44 of T/AVS 106-2018
Into the encoded output stream
Must
Table 12 (continued)
Technical requirements of the project
6 encoding parameter configuration import and export
The encoder supports the main encoding parameters, such as. input video format, video encoding method, video
Frequency encoding rate, audio encoding method, audio encoding rate, GOP length, GOP structure, etc.
Save as "encoder parameter configuration file"; "encoder parameter configuration file" can be
Import and export of the specified interface of the encoder;
Data configuration file ", should be able to read and configure the relevant encoding parameters of the device accordingly
Must
7-channel configuration order does not change the channel configuration order of the input signal
8 SAO setting function
Support setting sao_enable_flag of Y component, Cb component and Cr component to be consistent with each other,
I.e. fully open or fully closed
Optional
9 6G-SDI input interface 1 6G-SDI (SMPTE ST 2081-1..2015) input interface, interface type is BNC, 75 optional
10 12G-SDI input interface 1 12G-SDI (SMPTE ST 2082-1..2015) input interface, interface type is BNC, 75 optional
11 Digital audio input interface Digital audio input interface, the interface type is BNC, 75 or XLR, 110 optional
12 Video and audio encoding parameter settings
Video encoding rate, GOP length, GOP structure and other encoding parameters and audio encoding speed
Rate and other encoding parameters for effective settings
Must
13 Audio transcoding support Dolby E audio to other transmission encoding formats
14 Low-latency working mode Support low-latency working mode, the total codec delay is less than 100ms optional
15 Output inhibit function When there is no input signal in any of the 4 × 3G-SDI channels, the encoder should have no output optional
16 Long Run
Support 7 × 24h operation. During the operation, the output code stream should be continuous without interruption, no
First-level and second-level errors, video and audio bit rate fluctuations should meet the requirements of 4.6, codec images should be
Continuous without interruption, and can not introduce abnormalities such as still frames, black spots, freezes, and Huaping, and the audio should be neutral.
Break, mute or abnormal sound, the audio index should meet the requirements of 4.13
Must
4.8 ASI output interface technical requirements
See Table 13 for the technical requirements of the encoder ASI output interface.
Table 13 Technical requirements for encoder ASI output interface
Project technical indicators
1 Output amplitude 800mV80mV
2 Rise time (20% ～ 80%) ≤1200ps
3 Fall time (80% ～ 20%) ≤1200ps
4 Deterministic jitter a ≤10%
a For the definition of deterministic jitter, see A.3.3.1 of GY/T 170-2001.
4.9 Total codec delay
The total codec delay should not exceed 3s.
4.10 Power-on startup delay
The time from when the device is powered on to when it outputs a normal image should not exceed 3 minutes.
4.11 Relative Delay of Audio and Video
The relative timing error of audio and video introduced by the codec should be within ± 2ms;
Based on video, audio lead is positive and audio lag is negative.
4.12 Video Technical Requirements
See Table 14 for video technical requirements.
Table 14 Video technical requirements
Item
Technical index
Y CB CR
1 intervention gain ± 0.03dB ± 0.03dB ± 0.03dB
2 Amplitude-frequency characteristics
Frequency range 0MHz ～ 240MHz 0MHz ～ 120MHz 0MHz ～ 120MHz
Amplitude tolerance ± 0.2dB ± 0.2dB ± 0.2dB
3 Non-linear distortion ≤ 2% ≤ 2% ≤ 2%
4 Color bar signal vector phase difference ± 5 °
4.13 Audio Technical Requirements
For two-channel and 2.0 stereo coding, the audio specifications are shown in Table 15. For 5.1 surround sound coding, audio specifications are required
See Table 15 to Table 18 (Audio loudness control metadata is not enabled during decoding test).
Table 15 Left and right channel audio technical requirements
Project technical indicators
1 Audio intervention gain ± 0.5dB
2 Audio total harmonic distortion ≤0.5%
3 Audio frequency response (20Hz ～ 20kHz) ± 0.5dB
4 Audio signal-to-noise ratio (unweighted) ≥70dB
5 Audio channel level difference ≤0.5dB
6 Audio channel phase difference ≤ 3 °
Table 16 Audio technical requirements for left and right surround channels
Project technical indicators
1 Audio intervention gain ± 0.5dB
2 Audio total harmonic distortion ≤0.5%
3 Audio frequency response (20Hz ～ 20kHz) ± 0.5dB
4 Audio signal-to-noise ratio (unweighted) ≥70dB
5 Audio channel level difference ≤0.5dB
6 Audio channel phase difference ≤ 3 °
Table 17 Technical requirements for center channel audio
Project technical indicators
1 Audio intervention gain ± 0.5dB
2 Audio total harmonic distortion ≤0.5%
3 Audio frequency response (20Hz ～ 20kHz) ± 0.5dB
4 Audio signal-to-noise ratio (unweighted) ≥70dB
Table 18 Audio technical requirements for low-frequency effect channels
Project technical indicators
1 Audio intervention gain ± 0.5dB
2 Audio total harmonic distortion ≤0.5%
3 Audio frequency response (20Hz ～ 120Hz) ± 0.5dB
4 Audio signal-to-noise ratio (unweighted) ≥70dB
4.14 encoder image quality requirements
When the encoder video compression bit rate is set to 36Mbps, the method specified in 5.13 is adopted.
Test sequences with the same characteristics (of which 4 test sequences should be highly active sequences), at least 6 sequences should be subjectively evaluated under image quality
The percentage reduction (relative to the source sequence) is not more than 12%, and the percentage of subjective evaluation image quality reduction in other sequences (relative to the source sequence) is not large
At 20%.
5 Measurement method
5.1 Measuring environmental conditions
Ambient temperature. 15 ℃ ～ 35 ℃;
Relative humidity. 20% to 80%;
Atmospheric pressure. 86kPa ～ 106kPa;
Voltage amplitude. 220V ± 22V AC;
Voltage frequency. 50Hz ± 2Hz.
5.2 Encoder bit rate measurement settings
Except for the special encoder specified, during the measurement, the total bit rate of the output TS stream (188-byte packet length) is set to 38Mbps;
The bit rate is set to 36Mbps; the dual-channel and 2.0 stereo audio bit rates are set to 256kbps, and the 5.1 surround sound audio bit rate is set to 448kbps.
Sampling frequency is 48kHz.
When measuring the bit rate, the measurement method is used to count the number of TS packets (188-byte packet length). The time window is 20ms, and the window sliding step is
20ms.
5.3 Reference decoder for measurement
The reference decoder refers to the supporting decoder used when measuring the encoder under test. Its key indicators are as follows.
--Maximum effective code rate supported by ASI input interface. ≥150Mbps;
-Video intervention gain. ± 0.01dB (Y, CB, CR);
-Video amplitude-frequency characteristics. ± 0.1dB (Y component. 0MHz ～ 240MHz; CB and CR component. 0MHz ～ 120MHz);
--Video nonlinear distortion. ≤1% (Y, CB, CR);
--Color bar signal vector phase difference. ± 5 °;
-Audio intervention gain. ± 0.1dB;
-Audio total harmonic distortion. ≤0.05%;
-Audio frequency response. ± 0.1dB (20Hz ～ 20kHz);
-Audio signal-to-noise ratio. ≥80dB.
5.4 Measurement of Transport Stream Standard Compliance and Performance
5.4.1 Measurement block diagram
The measurement block diagram is shown in Figure 1.
Video and audio signal source tested encoder code stream analyzer
SDI ASI or IP
Figure 1 Transport Stream Standard Compliance and Performance Measurement Block Diagram
5.4.2 Measurement procedure
The measurement steps are as follows.
a) Connect the ASI output interface (or IP interface) of the tested encoder to the code stream analyzer, observe 6h, and chec...
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