CN113891065A - Single-frame image transmission delay measuring method and system - Google Patents
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Abstract
The embodiment of the invention provides a method and a system for measuring transmission delay of a single frame image, wherein a GNSS module which is simplest and lowest in cost is used, a signal output by the GNSS positioning module is used as a PPS signal and serves as a synchronous signal of a video transmission system, GPIO ports at an image coding end and a decoding end are connected, the GPIO ports are led out from the image coding end and serve as state output, and an oscilloscope is additionally arranged, so that accurate delay from coding, transmission and decoding of a frame image can be accurately measured.
Description
Technical Field
The embodiment of the invention relates to the technical field of intelligent driving, in particular to a method and a system for measuring transmission delay of a single-frame image.
Background
Recently, video encoding and decoding and transmission methods have become a hot issue in the video field. Video transmission systems generally include an encoding side (image capture and encoding), a transmission side (transmitting and receiving side), and a decoding side (decoding and displaying). The coding and decoding transmission delay of the video or the image is a key index for assessing a video transmission system. A common measurement method is that the encoding end aligns to a high-precision millisecond timer to acquire an image, and the decoding end decodes the image through communication transmission (wired or wireless). In the process, a high-speed camera is used for simultaneously aligning the millisecond timer and the decoding end image display device to take a picture, and the difference value of the millisecond counter and the decoding end image display device display millisecond counter is compared, namely the time delay of the video transmission system. The measuring method is limited by expensive high-speed cameras, and the precision is not high.
Disclosure of Invention
The embodiment of the invention provides a method and a system for measuring the transmission delay of a single-frame image, which aim to solve the problems that the delay measurement of a video transmission system in the prior art is limited by an expensive high-speed camera and has low precision.
In a first aspect, an embodiment of the present invention provides a method for measuring transmission delay of a single frame image, including:
when the encoder receives pulse per second PPS sent by a GNSS positioning module of a global navigation satellite system at the time of T0, a frame of image data of the CMOS image sensor is taken for encoding and then sent to the decoder;
when the decoder receives the PPS sent by the GNSS positioning module at the time of T0, the decoder receives the data and obtains the data to send to a display at the time of T2 when the decoding is finished;
the transmission delay from encoding to decoding is determined to be T2-T0.
Preferably, before the encoder receives the pulse per second PPS transmitted by the global navigation satellite system GNSS at time T0, the method further includes:
and simultaneously starting a decoder and an encoder, wherein the decoder and the encoder receive the PPS sent by the GNSS positioning module and serve as synchronous signals.
Preferably, the GPIO ports of the decoder and the encoder are both connected to a GNSS positioning module, and the GNSS positioning module is configured to send PPS to the decoder and the encoder.
Preferably, the encoder receives the pulse per second PPS sent by the GNSS positioning module at time T0, and specifically includes:
when the encoder receives the PPS, a pulse clock T0 of the PPS is measured through an oscilloscope, and the encoder receives an interrupt;
the method for receiving the pulse per second PPS sent by the GNSS positioning module at the time of T0 by the decoder specifically includes:
when the encoder receives the PPS, the pulse clock T0 of the PPS is measured through the oscilloscope, and the decoder starts the receiver to receive data.
Preferably, the receiving of the data by the decoder and the sending of the data to the display at the time T2 when the decoding is completed include:
after the decoder decodes the data, the GPIO port outputs a high pulse signal, the oscilloscope count is T1, and when the data is sent to the display and the decoding is finished, the time of the display for displaying the image is T2 measured by the oscilloscope.
In a second aspect, an embodiment of the present invention provides a single frame image transmission delay measurement system, including an encoding end, a decoding end, and a measurement module; the decoding end comprises a decoder and a first GNSS positioning module connected with the decoder, and the encoding end comprises an encoder and a second GNSS positioning module connected with the encoder;
when the encoder receives the PPS (pulse per second) sent by the first GNSS positioning module at the time of T0, a frame of image data of the CMOS image sensor is taken for encoding, and then the frame of image data is sent to the decoder;
when the decoder receives the PPS sent by the second GNSS positioning module at the time of T0, the decoder receives the data and obtains the data and sends the data to the display at the time of T2 when the decoding is finished;
and the measuring module determines the transmission delay from encoding to decoding to be T2-T0.
Preferably, the decoder is further connected with a CMOS sensor and a transmitting module; the CMOS sensor is used for transmitting image data to the encoder, and the sending module is used for sending the data encoded by the encoder to the encoding end;
the encoder is also connected with a receiving module and a display; the receiving module is used for receiving the data sent by the encoder; the display is used for decoding and displaying data.
Preferably, the display is further connected with a third GNSS module.
Preferably, the display, the decoder and the encoder are all provided with GPIO ports, and the GPIO ports are connected with an oscilloscope; the oscilloscope is used for measuring the time T0 when the encoder receives the PPS sent by the first GNSS positioning module, receiving the high pulse signal output by the GPIO port of the encoder after decoding data is finished, and measuring the time T1 when the data is sent to the display and the decoding is finished, wherein the time T2 is measured.
The method and the system for measuring the transmission delay of the single-frame image provided by the embodiment of the invention use a GNSS module which is simplest and lowest in cost, use a signal output by a GNSS positioning module as a PPS signal as a synchronous signal of a video transmission system, access GPIO ports at an image coding end and a decoding end, lead out the GPIO port at the image coding end as state output, and add an oscilloscope additionally, so that the accurate delay from coding, transmission and decoding of one frame of image can be accurately measured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a flow chart of a single-frame image transmission delay measurement method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a single-frame image transmission delay measurement system according to an embodiment of the present invention;
fig. 3 is a timing diagram of delay measurement according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The coding and decoding transmission delay of the video or the image is a key index for assessing a video transmission system. A common measurement method is that the encoding end aligns to a high-precision millisecond timer to acquire an image, and the decoding end decodes the image through communication transmission (wired or wireless). In the process, a high-speed camera is used for simultaneously aligning the millisecond timer and the decoding end image display device to take a picture, and the difference value of the millisecond counter and the decoding end image display device display millisecond counter is compared, namely the time delay of the video transmission system. The measuring method is limited by expensive high-speed cameras, and the precision is not high.
Therefore, the embodiment of the invention provides a method and a system for measuring transmission delay of a single frame image, which use a GNSS module which is simplest and lowest in cost, use a signal output by a GNSS positioning module as a PPS signal as a synchronous signal of a video transmission system, access GPIO ports at an image coding end and a decoding end, simultaneously lead out the GPIO port at the image coding end as state output, and add an oscilloscope additionally, so that accurate delay from coding, transmission and decoding of a frame image can be accurately measured. The following description and description will proceed with reference being made to various embodiments.
Fig. 1 is a flow chart of a method for measuring a transmission delay of a single frame image according to an embodiment of the present invention, fig. 2 is a schematic structural diagram of a system for measuring a transmission delay of a single frame image according to an embodiment of the present invention, fig. 3 is a timing chart of a delay measurement according to an embodiment of the present invention, and referring to fig. 1 to 3, the method includes:
when the encoder receives pulse per second PPS sent by a GNSS positioning module of a global navigation satellite system at the time of T0, a frame of image data of the CMOS image sensor is taken for encoding and then sent to the decoder;
when the decoder receives the PPS sent by the GNSS positioning module at the time of T0, the decoder receives the data and obtains the data to send to a display at the time of T2 when the decoding is finished;
the delay time from encoding, transmission, to decoding is calculated as: T-T2-T0.
In the embodiment, clock synchronization is realized through the GNSS, the pulse clock contained in the data is acquired by reading the GNSS data of the GNSS, and whether the clocks of the decoder and the encoder are consistent or not is judged, so that the problem that the GNSS data cannot be acquired in real time can be solved, and the problem that a plurality of application programs call the GNSS data to generate conflict is avoided.
Based on the content of the foregoing embodiment, as a preferred implementation manner, before the encoder receives the pulse-of-second PPS sent by the global navigation satellite system GNSS at time T0, the method further includes:
and simultaneously starting a decoder and an encoder, wherein the decoder and the encoder receive the PPS sent by the GNSS positioning module and serve as synchronous signals.
Specifically, when the PPS clock pulse comes, the oscilloscope measures the pulse clock to be T0, the encoder receives the interrupt, one frame of image data of the CMOS sensor is taken, encoded and sent to the receiving module, and when the PPS clock pulse comes, the oscilloscope measures the pulse clock to be T0, and the decoder starts the receiver to receive the data.
The GNSS module which is simplest to use and lowest in cost is utilized, signals output by the GNSS positioning module are used as PPS signals to serve as synchronous signals of a video transmission system, and accurate time delay from coding, transmission to decoding of one frame of image can be accurately measured.
Based on the content of the foregoing embodiment, as a preferred implementation manner, the GPIO ports of the decoder and the encoder are both connected to a GNSS positioning module, and the GNSS positioning module is configured to send PPS to the decoder and the encoder.
In the embodiment, a signal output by the GNSS positioning module is used as a PPS signal as a synchronous signal of the video transmission system, and is connected to GPIO ports at the image coding end and the decoding end, and the GPIO port is led out at the image coding end to be output as a state, and an oscilloscope is additionally added, so that accurate delay from coding, transmission to decoding of one frame of image can be accurately measured.
Based on the content of the foregoing embodiment, as a preferred implementation manner, the method for receiving the pulse per second PPS sent by the GNSS positioning module at time T0 by the encoder specifically includes:
when the encoder receives the PPS, a pulse clock T0 of the PPS is measured through an oscilloscope, and the encoder receives an interrupt;
the method for receiving the pulse per second PPS sent by the GNSS positioning module at the time of T0 by the decoder specifically includes:
when the encoder receives the PPS, the pulse clock T0 of the PPS is measured through the oscilloscope, and the decoder starts the receiver to receive data.
Based on the content of the foregoing embodiments, as a preferred implementation manner, the method for receiving data by a decoder and obtaining the data to send to a display at a time T2 when decoding is completed specifically includes:
after the decoder decodes the data, the GPIO port outputs a high pulse signal, the oscilloscope count is T1, and when the data is sent to the display and the decoding is finished, the time of the display for displaying the image is T2 measured by the oscilloscope.
In an embodiment, an embodiment of the present invention further provides a single frame image transmission delay measurement system, as shown in fig. 2, the system includes an encoding end, a decoding end, and a measurement module; the decoding end comprises a decoder and a first GNSS positioning module connected with the decoder, and the encoding end comprises an encoder and a second GNSS positioning module connected with the encoder;
when the encoder receives the PPS (pulse per second) sent by the first GNSS positioning module at the time of T0, a frame of image data of the CMOS image sensor is taken for encoding, and then the frame of image data is sent to the decoder;
when the decoder receives the PPS sent by the second GNSS positioning module at the time of T0, the decoder receives the data and obtains the data and sends the data to the display at the time of T2 when the decoding is finished;
and the measuring module determines the transmission delay from encoding to decoding to be T2-T0.
Furthermore, the decoder is also connected with a CMOS sensor and a sending module; the CMOS sensor is used for transmitting image data to the encoder, and the sending module is used for sending the data encoded by the encoder to the encoding end; the encoder is also connected with a receiving module and a display; the receiving module is used for receiving the data sent by the encoder; the display is used for decoding and displaying data.
Furthermore, the display is also connected with a third GNSS module.
Furthermore, the display, the decoder and the encoder are all provided with GPIO ports, and the GPIO ports are connected with an oscilloscope; the oscilloscope is used for measuring the time T0 when the encoder receives the PPS sent by the first GNSS positioning module, receiving the high pulse signal output by the GPIO port of the encoder after decoding data is finished, and measuring the time T1 when the data is sent to the display and the decoding is finished, wherein the time T2 is measured.
It can be understood that the single frame image transmission delay measurement system provided by the present invention corresponds to the single frame image transmission delay measurement method provided in the foregoing embodiments, and how to specifically use the system to perform single frame image transmission delay measurement may refer to the related technical features of the single frame image transmission delay measurement method in the foregoing embodiments, and details of this embodiment are not described herein again.
In summary, the embodiments of the present invention provide a method and a system for measuring transmission delay of a single frame image, where a GNSS module with the simplest and the lowest cost is used, and a signal output by a GNSS positioning module is used as a PPS signal as a synchronization signal of a video transmission system, and is connected to GPIO ports at an image encoding end and a decoding end, and a GPIO port is led out from the image encoding end as a state output, and an oscilloscope is additionally added, so that accurate delay from encoding, transmission, and decoding of a frame image can be accurately measured.
It should be noted that, in the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to relevant descriptions of other embodiments for parts that are not described in detail in a certain embodiment.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (methods), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A method for measuring transmission delay of a single frame image is characterized by comprising the following steps:
when the encoder receives pulse per second PPS sent by a GNSS positioning module of a global navigation satellite system at the time of T0, a frame of image data of the CMOS image sensor is taken for encoding and then sent to the decoder;
when the decoder receives the PPS sent by the GNSS positioning module at the time of T0, the decoder receives the data and obtains the data to send to a display at the time of T2 when the decoding is finished;
the transmission delay from encoding to decoding is determined to be T2-T0.
2. The method of claim 1, wherein before the encoder receives the pulse of seconds PPS sent by the global navigation satellite system GNSS at time T0, the method further comprises:
and simultaneously starting a decoder and an encoder, wherein the decoder and the encoder receive the PPS sent by the GNSS positioning module and serve as synchronous signals.
3. The method as claimed in claim 1, wherein the GPIO ports of the decoder and the encoder are connected to a GNSS positioning module, and the GNSS positioning module is configured to send PPS to the decoder and the encoder.
4. The method of claim 1, wherein the encoder receives the pulse-per-second PPS sent by a GNSS positioning module of a global navigation satellite system at time T0, and the method specifically includes:
when the encoder receives the PPS, a pulse clock T0 of the PPS is measured through an oscilloscope, and the encoder receives an interrupt;
the method for receiving the pulse per second PPS sent by the GNSS positioning module at the time of T0 by the decoder specifically includes:
when the encoder receives the PPS, the pulse clock T0 of the PPS is measured through the oscilloscope, and the decoder starts the receiver to receive data.
5. The method for measuring transmission delay of a single frame image according to claim 1, wherein the decoder receives the data and obtains a time T2 when the data is sent to the display after decoding is completed, and the method specifically comprises:
after the decoder decodes the data, the GPIO port outputs a high pulse signal, the oscilloscope count is T1, and when the data is sent to the display and the decoding is finished, the time of the display for displaying the image is T2 measured by the oscilloscope.
6. A single frame image transmission delay measurement system is characterized by comprising an encoding end, a decoding end and a measurement module; the decoding end comprises a decoder and a first GNSS positioning module connected with the decoder, and the encoding end comprises an encoder and a second GNSS positioning module connected with the encoder;
when the encoder receives the PPS (pulse per second) sent by the first GNSS positioning module at the time of T0, a frame of image data of the CMOS image sensor is taken for encoding, and then the frame of image data is sent to the decoder;
when the decoder receives the PPS sent by the second GNSS positioning module at the time of T0, the decoder receives the data and obtains the data and sends the data to the display at the time of T2 when the decoding is finished;
and the measuring module determines the transmission delay from encoding to decoding to be T2-T0.
7. The single-frame image transmission delay measurement system according to claim 6, wherein the decoder is further connected with a CMOS sensor and a transmission module; the CMOS sensor is used for transmitting image data to the encoder, and the sending module is used for sending the data encoded by the encoder to the encoding end;
the encoder is also connected with a receiving module and a display; the receiving module is used for receiving the data sent by the encoder; the display is used for decoding and displaying data.
8. The system of claim 6, wherein a third GNSS module is further connected to the display.
9. The single-frame image transmission delay measurement system according to claim 6, wherein the display, the decoder and the encoder are provided with GPIO ports, and the GPIO ports are connected with an oscilloscope; the oscilloscope is used for measuring the time T0 when the encoder receives the PPS sent by the first GNSS positioning module, receiving the high pulse signal output by the GPIO port of the encoder after decoding data is finished, and measuring the time T1 when the data is sent to the display and the decoding is finished, wherein the time T2 is measured.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114780324A (en) * | 2022-06-20 | 2022-07-22 | 深圳市华曦达科技股份有限公司 | Media delay testing method and device for android system |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6285405B1 (en) * | 1998-10-14 | 2001-09-04 | Vtel Corporation | System and method for synchronizing data signals |
| GB0116928D0 (en) * | 2001-07-11 | 2001-09-05 | Motorola Inc | Video transmission system, video tranmission unit and methods of encoding/decoding video data |
| US20120198307A1 (en) * | 2009-08-27 | 2012-08-02 | Suresh Vithal Kibe | Method of communicating signal data in gnss using ldpc convolution codes and a system thereof |
| WO2015019663A1 (en) * | 2013-08-07 | 2015-02-12 | 株式会社日立国際電気 | Digital transmission system and lag time calculation method |
| CN106851259A (en) * | 2017-01-17 | 2017-06-13 | 中国科学院上海高等研究院 | video delay test device in monitoring system |
| US20180097573A1 (en) * | 2015-04-30 | 2018-04-05 | Hangzhou Hikvision Digital Technology Co., Ltd. | Method and system for detecting image delay |
| CN109327700A (en) * | 2018-11-23 | 2019-02-12 | 中国电子科技集团公司第五十四研究所 | A kind of image coding and decoding time delay measuring method based on SEI transmission |
| CN109889847A (en) * | 2019-01-18 | 2019-06-14 | 昆山优尼电能运动科技有限公司 | Low delay is wirelessly transferred coding/decoding system |
| CN110740227A (en) * | 2019-10-25 | 2020-01-31 | 武汉大学 | Camera time synchronization device and method based on GNSS time service and image display information coding mode |
| CN111294666A (en) * | 2019-07-04 | 2020-06-16 | 杭州萤石软件有限公司 | Video frame transmission method and method, device and system for determining video frame transmission delay |
| JP2020202475A (en) * | 2019-06-07 | 2020-12-17 | 日本放送協会 | Wireless device |
| CN112565224A (en) * | 2020-11-26 | 2021-03-26 | 北京经纬恒润科技股份有限公司 | Video processing method and device |
| CN112601078A (en) * | 2020-12-11 | 2021-04-02 | 杭州当虹科技股份有限公司 | Automatic measuring method for encoder delay based on video |
| CN112887682A (en) * | 2021-02-23 | 2021-06-01 | 中国铁道科学研究院集团有限公司 | Multi-track image synchronous acquisition and storage system and method |
| CN214014395U (en) * | 2021-06-08 | 2021-08-20 | 北京科技大学 | High-precision video transmission delay test system |
-
2021
- 2021-09-09 CN CN202111059463.1A patent/CN113891065B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6285405B1 (en) * | 1998-10-14 | 2001-09-04 | Vtel Corporation | System and method for synchronizing data signals |
| GB0116928D0 (en) * | 2001-07-11 | 2001-09-05 | Motorola Inc | Video transmission system, video tranmission unit and methods of encoding/decoding video data |
| US20120198307A1 (en) * | 2009-08-27 | 2012-08-02 | Suresh Vithal Kibe | Method of communicating signal data in gnss using ldpc convolution codes and a system thereof |
| WO2015019663A1 (en) * | 2013-08-07 | 2015-02-12 | 株式会社日立国際電気 | Digital transmission system and lag time calculation method |
| US20180097573A1 (en) * | 2015-04-30 | 2018-04-05 | Hangzhou Hikvision Digital Technology Co., Ltd. | Method and system for detecting image delay |
| CN106851259A (en) * | 2017-01-17 | 2017-06-13 | 中国科学院上海高等研究院 | video delay test device in monitoring system |
| CN109327700A (en) * | 2018-11-23 | 2019-02-12 | 中国电子科技集团公司第五十四研究所 | A kind of image coding and decoding time delay measuring method based on SEI transmission |
| CN109889847A (en) * | 2019-01-18 | 2019-06-14 | 昆山优尼电能运动科技有限公司 | Low delay is wirelessly transferred coding/decoding system |
| JP2020202475A (en) * | 2019-06-07 | 2020-12-17 | 日本放送協会 | Wireless device |
| CN111294666A (en) * | 2019-07-04 | 2020-06-16 | 杭州萤石软件有限公司 | Video frame transmission method and method, device and system for determining video frame transmission delay |
| CN110740227A (en) * | 2019-10-25 | 2020-01-31 | 武汉大学 | Camera time synchronization device and method based on GNSS time service and image display information coding mode |
| CN112565224A (en) * | 2020-11-26 | 2021-03-26 | 北京经纬恒润科技股份有限公司 | Video processing method and device |
| CN112601078A (en) * | 2020-12-11 | 2021-04-02 | 杭州当虹科技股份有限公司 | Automatic measuring method for encoder delay based on video |
| CN112887682A (en) * | 2021-02-23 | 2021-06-01 | 中国铁道科学研究院集团有限公司 | Multi-track image synchronous acquisition and storage system and method |
| CN214014395U (en) * | 2021-06-08 | 2021-08-20 | 北京科技大学 | High-precision video transmission delay test system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114780324A (en) * | 2022-06-20 | 2022-07-22 | 深圳市华曦达科技股份有限公司 | Media delay testing method and device for android system |
| CN114780324B (en) * | 2022-06-20 | 2022-09-13 | 深圳市华曦达科技股份有限公司 | Media delay testing method and device for android system |
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