GY/T 324-2019Technical requirements and measurement methods of AVS2 professional satellite integrated receiver decoder for 4K UHDTV (English PDF)

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., Guangzhou Keweixin Digital Technology Co., Ltd.

Division, Beijing Digital Video Technology Co., Ltd., Shanghai Guomao Digital Technology Co., Ltd., Beijing Jiawei Communication Electronic Technology Co., Ltd., Beijing Liujin Years Culture Communication Co., Ltd., Shenzhen Hisilicon Semiconductor Co., Ltd., Hangzhou Danghong Technology Co., Ltd., Shenzhen Longgang Intelligent Audiovisual Research Institute, Shanghai Zhaoxin Integrated Circuit Co., Ltd.

1 Scope

This standard specifies the video decoding using the 4K ultra-high-definition professional satellite integrated receiver decoder of GY/T 299.1-2016 (referred to as AVS2) Technical requirements and measurement methods.

This standard is applicable to the development, testing, production, use, and maintenance of AVS2 4K UHD professional satellite integrated receiver decoder.

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 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 148-2000 satellite digital television receiver technical requirements GY/T 150-2000 Satellite digital TV receiving station measurement method-indoor unit measurement 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 SJ/T 11336 Conditional Access Interface Specification for Digital TV Receiver Equipment-Part 1-1. DTV-CI Technical Specification T/AVS 102 AVS Interoperability Test Specification T/AVS 107 Efficient Multimedia Encoded Video Compliance Test ETSI TR 101 290 Measurement guidelines for DVB systems 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.

ASI Asynchronous Serial Interface CI Common Interface ETSI European Telecommunications Standards Institute SQD Square Division TS Transport Stream 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

8 Multi-program transport stream decoding

9 Audio and video relative delay adjustment Audio and video relative delay should be adjustable within ± 2ms Single vision Stream decoding stand by Class and level Benchmark 10-bit class (Profile_id has a value of 0x22) 8.0.60 (maximum code rate. 40Mbps) 8.2.60 (max. Code rate 160Mbps) optional 8.0.120 (maximum code rate 60Mbps) optional 8.2.120 (Maximum code rate 240Mbps) Optional 11 frame rate 50Hz (progressive) required 12 aspect ratio 16. 9 essential

13 Chroma Format 4. 2. 0 Required

14 Sample accuracy 10 digits required

15 Image resolution 3840x2160 essential

Table 1 (continued)

Technical requirements of the project

16 Single View

Stream

decoding

stand by

The color gamut supports the color gamuts required by GY/T 315-2018 and GY/T 307-2017.

17 Dynamic range

Support GY/T 315-2018 and GY/T 307-2017 non-linear transfer function, solution the dynamic range identification in the 3G-SDI signal of the code output should comply with SMPTE ST 425-1..2017 the requirements in Table 5 are consistent with the content of the code stream.

Must

18 Audio support

Supports MPEG-1 layer II audio conforming to GB/T 17191.3 for two-channel and 2.0 stereo Decode and output Must Supports decoding of 5.1 surround sound AVS2 audio stream in accordance with GB/T 33475.3 and 5.1 Surround sound 6-channel output, support audio stream through output Optional Supports ETSI TS 102 366 v1.4.1-compliant AC-3 audio streaming for 5.1 surround sound Decoding and 5.1 surround sound 6-channel output, support for audio stream through output Optional Supports decoding of 5.1 surround sound GB/T 22726 DRA audio stream and 5.1 Surround sound 6-channel output, support audio stream through output Optional

19 Continue decoding after interruption

When the decoder is in the normal decoding state, the input stream is disconnected and connected again after 1 minute (stream parameters Unchanged), the decoder should automatically continue decoding within 5s Must

20 Bitstream descrambling

With the scrambled code stream input to the decoder and normal decoding, remove the CI card for at least 30s After inserting again, the decoder should automatically continue descrambling decoding within 8s;

When the decoder switches between ASI and IP inputs, the descrambling card should be able to descramble automatically.

After receiving, the decoder video can't appear abnormal such as still frame, black frame, freeze, Huaping, etc.

Uninterrupted audio, mute and abnormal sound Must

21 ASI output interface

Meet the requirements of GY/T 170-2001 table A5, the interface type is BNC, 75, the maximum output code the rate is at least 75Mbps (excluding empty packets) Number 21 and sequence no. 22 with at least One of the 22 IP output interfaces supports TS over IP output interface with interface type RJ45, which supports unicast and multicast output 23 6G-SDI output interface 1 6G-SDI (SMPTE ST 2081-1..2015) output interface, type is BNC, 75 optional 24 12G-SDI output interface 1 12G-SDI (SMPTE ST 2082-1..2015) output interface, type is BNC, 75 optional

25 Long Run

Support 7 × 24h operation. During the operation, the decoded image should be continuous without interruption.

Anomalies such as black scenes, stuttering, and Huaping, without interruption, mute, and abnormal sound Must Adjust the relative delay of audio and video to within ± 2ms. After 7 days of continuous operation, the measured audio and video phase the delay should not exceed -30ms and 22.5ms (based on video, audio lead is positive, Audio lag is negative) Must Make the first measurement of the total codec delay. After 7 days of continuous operation, the total measured codec the change of the delay from the first measurement should not exceed ± 250ms Must

26 Interoperability of interoperability decoder should meet the requirements of T/AVS 102

4.2 Satellite channel radio frequency technical requirements it should meet the requirements of Chapter 5, Chapter 6 and Chapter 7 of GY/T 148-2000.

4.3 Technical Requirements for Standard Compliance it shall be able to correctly decode the T/AVS 107 test bitstreams that do not exceed the technical requirements of Table 1 "Single Video Decoding Support".

4.4 ASI input interface technical requirements the technical requirements of the decoder's ASI input interface are shown in Table 2.

Table 2 ASI input interface technical requirements

Project technical indicators

1 Maximum input voltage

2 Minimum sensitivity

3 Reflection loss (5MHz ~ 270MHz) <=-15dB 4.5 4 × 3G-SDI output interface technical requirements See Table 3 for the technical requirements of each link in the decoder's 4 × 3G-SDI output interface.

Table 3 Technical requirements for 4 × 3G-SDI output interface of decoder

Project technical indicators

1 Output amplitude 800mV ± 80mV

2 Rise time (20% ~ 80%) <=135ps

3 Fall time (80% ~ 20%) <=135ps

4 Absolute difference between rise time and fall time <=50ps

5 Rise/fall overshoot <=10%

6 Jitter (10Hz high-pass filter) <= 2UI

7 Jitter (100kHz high-pass filter) <= 0.3UI

4.6 IP output performance requirements for decoders with IP output interfaces, the technical requirements for IP output performance are shown in Table 4.

Table 4 Technical requirements for IP output performance

Project technical indicators

1 Delay factor <= 5ms

2 Packet loss rate 0

4.7 Video technical requirements See Table 5 for decoder video technical requirements.

Table 5 Technical requirements for decoder video

Item

Technical index

Y CB CR

1 intervention gain ± 0.03dB ± 0.03dB ± 0.03dB Amplitude frequency characteristic 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 °

4.8 Audio technical requirements for two-channel and 2.0 stereo audio streams, the audio technical requirements for decoded output are shown in Table 6. For metadata without audio loudness control for the 5.1-channel audio bitstream, the audio technical requirements for the decoded output are shown in Tables 6-9.

Table 6 Left and right channel audio technical requirements

Project technical indicators

1 Audio intervention gain ± 0.5dB

2 Audio total harmonic distortion

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 7 Audio technical requirements for left and right surround channels

Project technical requirements

1 Audio intervention gain ± 0.5dB

2 Audio total harmonic distortion

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 8 Technical requirements for center channel audio

Project technical indicators

1 Audio intervention gain ± 0.5dB

2 Audio total harmonic distortion

3 Audio frequency response (20Hz ~ 20kHz) ± 0.5dB

4 Audio signal-to-noise ratio (unweighted) >=70dB

Table 9 Audio technical requirements for low-frequency effect channels

Project technical indicators

1 Audio intervention gain ± 0.5dB

2 Audio total harmonic distortion

3 Audio frequency response (20Hz ~ 120Hz) ± 0.5dB

4 Audio signal-to-noise ratio (unweighted) >=70dB

5 Measurement method

5.1 Measuring environmental conditions Ambient temperature. 15 °C ~ 35 °C;

Relative humidity. 20% to 80%;

Atmospheric pressure. 86kPa ~ 106kPa;

Voltage amplitude. 220V ± 22V AC;

Voltage frequency. 50Hz ± 2Hz.

5.2 Reference stream for measurement the reference code stream refers to the supporting code stream used when measuring the decoder under test. The key index requirements are as follows.

-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. <=0.5%;

-Audio frequency response. ± 0.5dB (20Hz ~ 20kHz);

-Audio signal-to-noise ratio (unweighted). >=75dB.

5.3 Measuring bit rate Except for the special code rate and standard compliance test items in 5.4, during the measurement process, the reference code stream output TS stream total Bit rate (188-byte packet length) is 38Mbps; video bit rate is 36Mbps; two-channel and 2.0 stereo audio bit rates are 256kbps, 5.1 surround the audio and video code rate is 448kbps and the sampling frequency is 48kHz. No primary and secondary errors specified in ETSI TR 101 290.

5.4 Standard compliance measurement

5.4.1 Measurement block diagram the measurement block diagram is shown in Figure 1.

Detector Detector Monitor ASI or IP SDI

Figure 1 Standard compliance measurement block diagram

5.4.2 Measurement procedure the measurement steps are as follows.

a) Connect the measuring instrument and the decoder under test according to Figure 1;

b) The code stream generator outputs the measurement transport stream, which is decoded by the decoder under test and output to the monitor;

c) Through the monitor, observe whether the audio and video decoded and output during the test show any abnormal situation.

5.5 Measurement of Satellite Channel Radio Frequency Technical Indicators Measure according to the measurement method specified in GY/T 150-2000.

5.6 ASI input interface technical indicators measurement

5.6.1 Measurement block diagram the characteristic measurement block diagram of the decoder's ASI input interface is shown in Figure 2 and the reflection loss measurement block diagram is shown in Figure 3.

Stream Generator Attenuator/Amp Detector Detector Monitor ASI ASI SDI Fig. 2 ASI input interface electrical characteristic measurement block diagram Detected Decoder Network Analyzer ASI

Figure 3 Block diagram of reflection loss measurement

5.6.2 ASI Input Interface Electrical Characteristics Measurement Procedure the measurement steps are as follows.

a) Connect the measuring instrument and the decoder under test according to Figure 2. The connection length between the attenuator/amplifier and the decoder under test is 100m to.200m 75ohm cable;

b) Use the attenuator/amplifier to adjust the ASI signal amplitude to.200mV and 880mV, respectively;

c) Observe on the monitor whether the image decoded by the tested decoder is normal.

5.6.3 ASI input interface reflection loss measurement steps the measurement steps are as follows.

a) Connect the measuring instrument and the decoder under test as shown in Figure 3, where a 75ohm cable is connected between the network analyzer and the decoder under test.

Input/output impedance of the measuring instrument is 75ohm;

b) Measure the reflection loss with a network analyzer.

5.7 4 × 3G-SDI output interface measurement

5.7.1 Measurement block diagram the measurement block diagram is shown in Figure 4.

Code Stream Generator Detected Decoder Video Analyzer ASI or IP SDI

Figure 4 4 × 3G-SDI output interface measurement block diagram

5.7.2 Measurement procedure the indicators of the 4 3G-SDI output interfaces of the decoder are measured one by one. The measurement steps are as follows.

a) Connect the measuring instrument and the decoder under test according to Figure 4;

b) Set the filter of the video analyzer to 1kHz, and read the 3G-SDI amplitude, rise time, fall time, up Underrush and undershoot, etc .;

c) Set the filter of the video analyzer to 10Hz, and read the jitter at this time on the video analyzer;

d) Set the filter of the video analyzer to 100kHz, and read the jitter at this time on the video analyzer.

5.8 Measurement of IP output performance technical indicators

5.8.1 Measurement block diagram the measurement block diagram is shown in Figure 5.

Code stream generator Modulator Detected decoder Code stream analyzer ASI RF IP

Figure 5 IP output performance measurement block diagram

5.8.2 Measurement procedure the measurement steps are as follows.

a) Connect the measuring instrument and the decoder under test according to Figure 5;

b) Use a stream analyzer to observe the output stream of the tested decoder for 15 minutes and check whether it meets the requirements of 4.6.

5.9 Video technical indicators measurement

5.9.1 Measurement block diagram the measurement block diagram is shown in Figure 6.

Detector Decoder Waveform Monitor ASI or IP SDI

Figure 6 Video technical indicators measurement block diagram

5.9.2 Measurement procedure the measurement steps are as follows.

a) Connect the measuring instrument and the decoder under test according to Figure 6;

b) The code stream generator outputs a reference code stream, and the video content is an ultra high-definition color bar signal, a multi-wave group signal, and a five-step signal;

c) After the reference code stream is decoded, it is read on the waveform monitor to calculate the intervention gain, amplitude-frequency characteristics, nonlinear distortion, and color bar Vector phase difference. On this basis, the reference code stream itself is subtracted from the intervention gain, amplitude-frequency characteristics, nonlinear distortion, and color bar Phase vector difference, get the video technical index of the tested decoder.

5.10 Measurement of audio technical indicators

5.10.1 Measurement block diagram the measurement block diagram is shown in Figure 7.

Code Stream Generator Detector Audio De-embedder Audio Analyzer ASI or IP SDI digital audio

Figure 7 Audio technical indicators measurement block diagram

5.10.2 Measurement procedure

5.10.2.1 Audio intervention gain the measurement steps are as follows.

a) Connect the measuring instrument and the decoder under test according to Figure 7;

b) The bitstream generator outputs the audio measurement reference bitstream, and the audio content is a 1kHz audio signal with an amplitude of -20dBFS and -6dBFS;

c) After the reference code stream is decoded, use an audio analyzer to measure the corresponding output audio signal levels respectively;

d) Calculate the absolute value of the difference between the output audio level and the input audio level, and take the maximum value as the intervention gain.

5.10.2.2 Total audio harmonic distortion the measurement steps are as follows.

a) Connect the measuring instrument and the decoder under test according to Figure 7;

b) The bitstream generator outputs the audio measurement reference bitstream, and the audio content is 20Hz ~ 20kHz (low frequency effect channel) 20Hz ~ 120Hz) frequency sweep signal;

c) After the reference code stream is decoded, use the audio analyzer to measure the total harmonic distortion of the corresponding output audio signal.

5.10.2.3 Audio amplitude-frequency characteristics the measurement steps are as follows.

a) Connect the measuring instrument and the decoder under test according to Figure 7;

b) The bitstream generator outputs the audio measurement reference bitstream, and the audio content is a frequency sweep signal with an amplitude of -20dBFS;

c) After the reference code stream is decoded, use an audio analyzer to measure the corresponding output audio signal level;

d) Using the signal level of 1kHz as a reference, calculate other frequencies in the band of 20Hz ~ 20kHz (the low-frequency effect channel is 20Hz ~ 120Hz) the relative level of the frequency points to obtain the audio frequency-frequency characteristics.

5.10.2.4 Audio signal-to-noise ratio (unweighted) the measurement steps are as follows.

a) Connect the measuring instrument and the decoder under test according to Figure 7;

b) The bitstream generator outputs the audio measurement reference bitstream, and the audio content is a 1kHz audio signal with an amplitude of -20dBFS;

c) After the reference code stream is decoded, use an audio analyzer to measure the corresponding 1kHz audio signal output level Vs;

d) Turn off the 1kHz audio signal output of the audio signal source, and measure the noise signal output level Vn with an audio analyzer;

e) The audio signal-to-noise ratio (unweighted) is obtained from equation (1), and the unit is decibel (dB).

S/N = Vs–Vn (1)

5.10.2.5 Audio channel level difference the measurement steps are as follows.

a) Connect the measuring instrument and the decoder under test according to Figure 7;

b) The bitstream generator outputs the audio measurement reference bitstream, the audio content is 20Hz ~ 20kHz (low Frequency effect channel is 20Hz ~ 120Hz) frequency sweep signal;

c) After the reference code stream is decoded, use an audio analyzer to measure the two-channel audio output signal levels at the corresponding frequency points.

The maximum value of the absolute value of the channel level difference is recorded as the audio channel level difference.

5.10.2.6 Audio channel phase difference...