CN208739279U - A kind of audio-video transmission system - Google Patents
A kind of audio-video transmission system Download PDFInfo
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Abstract
The utility model discloses a kind of audio-video transmission system, including transmitters and receivers, transmitters and receivers connections；Transmitter includes: video reception module, ADC module, audio/video coding module, HDBaseT coding module, the first memory module, the first main control module, the first control panel module and provides the first power supply module of power supply to above-mentioned module；Receiver includes video sending module, DAC module, audio/video decoding module, HDBaseT decoder module, the second memory module, the second main control module, the second control panel module and provides the second power supply module of power supply to above-mentioned module.The transmitter set of the audio-video transmission system video reception module, ADC module and audio/video coding module, receiver set video sending module, DAC module and audio/video coding module, audio-visual synchronization transmission and audio-visual synchronization separation can be achieved, solve the problems, such as that traditional transmitter cannot achieve audio-visual synchronization transmission and audio-visual synchronization separation.
Description
Technical field
The utility model relates to audio video transmission technical field more particularly to a kind of audio-video transmission systems.
Background technique
Video transmitter is mainly used for monitoring remote video, large-scale meeting-place and command centre etc. occasions.With large screen liquid
The advanced video terminal such as crystalline substance, figure viewed from behind machine, LED curtain wall shows that product shows that engineering and home theater are more and more answered in video
With the requirement to resolution ratio and clarity is higher and higher, and cost performance is higher and higher.Network bandwidth mentions for HD video source
The channel of circulation is supplied.The exactly maturation of these vertical industry chains so that common HD video be no longer satisfied it is all
The demand of user, and ultra high-definition video is increasingly becoming the market mainstream.But to cannot achieve audio-video same for existing video transmitter
Step transmission and audio-visual synchronization separation.
Utility model content
For overcome the deficiencies in the prior art, one of the purpose of this utility model is to provide a kind of audio video transmission system
System is able to achieve audio-visual synchronization transmission and audio-visual synchronization separation.
One of the purpose of this utility model adopts the following technical scheme that realization:
A kind of audio-video transmission system, including transmitters and receivers, the transmitter are connected with the receiver；
The transmitter includes: video reception module, ADC module, audio/video coding module, HDBaseT coding module,
One memory module, the first main control module, the first control panel module and the modules to the transmitter provide power supply
First power supply module, the audio/video coding module respectively with the video reception module, the ADC module, the HDBaseT
Coding module and first main control module connection；First main control module respectively with the first control panel module, institute
State video reception module, the HDBaseT coding module and first memory module connection；The transmitter is additionally provided with video
Input interface, audio input interface and the first RJ45 interface, the video reception module is connect with video input interface, described
ADC module is connect with the audio input interface, and the HDBaseT coding module is connect with the first RJ45 interface；
The receiver includes video sending module, DAC module, audio/video decoding module, HDBaseT decoder module,
Two memory modules, the second main control module, the second control panel module and the modules to the receiver provide power supply
Second power supply module, the audio/video decoding module respectively with the video sending module, the DAC module, the HDBaseT
Decoder module and second main control module connection；Second main control module respectively with the second control panel module, institute
State video sending module, the HDBaseT decoder module and second memory module connection；The receiver is additionally provided with video
Output interface, audio output interface and the 2nd RJ45 interface, the video sending module are connect with the video output interface, institute
It states DAC module to connect with the audio output interface, the HDBaseT decoder module is connect with the 2nd RJ45 interface；Institute
The first RJ45 interface is stated to connect with the 2nd RJ45 interface.
Further, the first RJ45 interface and the 2nd RJ45 interface support POE function of supplying power；Described first
RJ45 interface is connect by network twisted-pair cable with the 2nd RJ45 interface；First power supply module connects with the first RJ45
Mouth connection, second power supply module are connect with the 2nd RJ45 interface.
Further, the transmitter further includes the first serial line interface, and first serial line interface and the HDBaseT are compiled
Code module connection；The receiver further includes the second serial line interface, second serial line interface and the HDBaseT decoder module
Connection.
Further, the transmitter further includes infrared receiver end, and the infrared receiver end and the HDBaseT encode mould
Block connection；The receiver further includes infrared emission end, and the infrared emission end is connect with the HDBaseT decoder module.
Further, the video input interface includes HDMI video input interface and DVI video input interface；The view
Frequency output interface includes HDMI video output interface and DVI video output interface.
Further, the transmitter further includes HDMI ring outgoing interface, and the HDMI ring outgoing interface and the audio-video are compiled
Code module connection.
Further, the transmitter is equipped with the first USB upgrade interface, the first USB upgrade interface and described first
Main control module connection；The receiver is equipped with the 2nd USB upgrade interface, the 2nd USB upgrade interface and second master control
Module connection.
Further, the transmitter further includes the first KM module, and the first KM module and the HDBaseT encode mould
Block connection；The receiver further includes the 2nd KM module, and the 2nd KM module is connect with the HDBaseT decoder module.
Further, the first control panel module includes panel body, and the panel body is equipped with display screen, red
Outer reception head and operation button；The second control panel module is identical as the first control panel modular structure.
Compared with prior art, the utility model has the beneficial effects that:
The transmitter set of the audio-video transmission system video reception module, ADC module and audio/video coding module, connect
Device set video sending module, DAC module and audio/video coding module is received, it can be achieved that audio-visual synchronization transmission and audio-video
Separated in synchronization solves the problems, such as that traditional transmitter cannot achieve audio-visual synchronization transmission and audio-visual synchronization separation.
Detailed description of the invention
Fig. 1 is a kind of structural block diagram of audio-video transmission system provided by the utility model；
Fig. 2 is the workflow schematic diagram of the audio-video transmission system in Fig. 1；
Fig. 3 is the circuit diagram of the first main control module of the transmitter in Fig. 1；
Fig. 4 is the circuit diagram of the first KM module of the transmitter in Fig. 1；
Fig. 5 is the circuit diagram of the audio/video coding module of the transmitter in Fig. 1；
Fig. 6 is the POE module circuit diagram of the transmitter in Fig. 1；
Fig. 7 is the circuit diagram group of the HDBaseT coding module of the transmitter in Fig. 1, wherein Fig. 7 (a) is HDBaseT volume
The integrated circuit figure of code module, Fig. 7 (b) to Fig. 7 (h) are the enlarged drawing of each unit in Fig. 7 (a)；
Fig. 8 is the circuit diagram of the HDMI ring outgoing interface of the transmitter in Fig. 1；
Fig. 9 is the circuit diagram of the first RJ45 interface of the transmitter in Fig. 1；
Figure 10 is the circuit diagram of the first USB upgrade interface of the transmitter in Fig. 1；
Figure 11 is the circuit diagram of the first power supply module of the transmitter in Fig. 1；
Figure 12 is the infrared receiver end of the transmitter in Fig. 1 and the circuit diagram of serial line interface；
Figure 13 is the HDMI video input interface of the transmitter in Fig. 1 and the circuit diagram of DVI video input interface；
Figure 14 is the audio input interface of the transmitter in Fig. 1 and the circuit diagram of ADC module；
Figure 15 is the circuit diagram of the POE module of the receiver in Fig. 1；
Figure 16 is the circuit diagram of the HDBaseT decoder module of the receiver in Fig. 1, wherein Figure 16 (a) is HDBaseT solution
The integrated circuit figure of code module, Figure 16 (b) to Figure 16 (h) are the enlarged drawing of each unit in Figure 16 (a)；
Figure 17 is the audio output interface of the receiver in Fig. 1 and the circuit diagram of DAC module；
Figure 18 is the circuit diagram of the 2nd KM module of the receiver in Fig. 1；
Wherein, the circuit diagram of the corresponding module of the circuit diagram with transmitter of receiver part of module is consistent, therefore no longer another
It is shown with attached drawing, with specific reference to the circuit diagram of transmitter respective modules.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to the utility model, it should be noted that
Under the premise of not colliding, it can be formed in any combination between various embodiments described below or between each technical characteristic new
Embodiment.
Please refer to Fig. 1 to Figure 18, a kind of audio-video transmission system, including transmitters and receivers, the transmitter and institute
State receiver connection；
Transmitter includes: video reception module, ADC module, audio/video coding module, HDBaseT coding module, first deposits
It stores up module, the first main control module, the first control panel module and the modules to transmitter and the first power supply of power supply is provided
Module, audio/video coding module connect with video reception module, ADC module, HDBaseT coding module and the first main control module respectively
It connects；Main control module is connect with the first control panel module, video reception module, HDBaseT coding module and memory module respectively；
Transmitter is additionally provided with video input interface, audio input interface and the first RJ45 interface, and video reception module connects with video input
Mouth connection, ADC module are connect with audio input interface, and HDBaseT coding module is connect with the first RJ45 interface；
Receiver includes video sending module, DAC module, audio/video decoding module, HDBaseT decoder module, second deposits
It stores up module, the second main control module, the second control panel module and the modules to receiver and the second power supply of power supply is provided
Module, audio/video decoding module connect with video sending module, DAC module, HDBaseT decoder module and the second main control module respectively
It connects；Second main control module is stored with the second control panel module, video sending module, HDBaseT decoder module and second respectively
Module connection；Receiver is additionally provided with video output interface, audio output interface and the 2nd RJ45 interface, video sending module and view
The connection of frequency output interface, DAC module are connect with audio output interface, and HDBaseT decoder module is connect with the 2nd RJ45 interface；The
One RJ45 interface is connect with the 2nd RJ45 interface.
Through the above structure, vision signal from video reception module transfer into audio/video coding module, and audio signal
ADC module is transmitted in audio/video coding module, and audio and video are transmitted to HDBaseT coding by audio/video coding module together
It is encoded in module, realizes audio-visual synchronization transmission；When HDBaseT decoder module decodes the HDBaseT signal received
It for HDMI signal and is transmitted in audio/video decoding module, audio/video decoding module is managed according to EDID and HDMI/DVI format pipe
Reason exports suitable resolution ratio and signal format to display terminal, meanwhile, digital audio and video signals are exported to DAC by the port I2S
Module exports stereo analog audio by DAC digital-to-analogue conversion, realizes audio-visual synchronization separation.The audio-video transmission system can
Audio data is embedded in video flowing, or extracts audio data from video flowing, solving traditional transmitter cannot achieve sound
The problem of audio video synchronization transmission and audio-visual synchronization separate.
As a preferred embodiment, the first RJ45 interface and the 2nd RJ45 interface support POE function of supplying power；The
One RJ45 interface is connect by network twisted-pair cable with the 2nd RJ45 interface；First power supply module is connect with the first RJ45 interface, the
Two power supply modules are connect with the 2nd RJ45 interface.The audio-video transmission system supports cable POE power supply, as long as transmitter or reception
Have a high regard for meaning power supplying from one direction, the other end can work normally, it can also be powered by the unified all audio-video transmission systems of matrix, solution
The problem of being not easy to installation caused by the audio-video transmission system needs for having determined traditional are independently-powered.The audio-video transmission system with
A piece twisted pair for surpassing five classes can ensure that existing structureization wiring safety is same with simultaneous transmission of signals and power supply, POE technology
When guarantee existing network and audio-video signal regular event, reduce cost to the maximum extent.Standard POE equipment utilization twisted pair
In 4-5 and 7-8 two to line give remote equipment power, due to twisted pair core more carefully can not pass through larger current, POE equipment need
Will use 32-56V voltage transmission, and the transmission electric current of considered critical UTP in 400MA hereinafter, electricity consumption end utilize DC-DC converter
High voltage is converted into constant 12V voltage.By taking receiver as an example, power according to POE, directly by the power supply of transmitter and video
It is respectively connected to receiving end, does not need additionally to increase power supply adaptor in receiver.Specifically, the POE of transmitters and receivers is supplied
The circuit structure of Electricity Functional module is refering to Fig. 6 and Figure 15.
As a preferred embodiment, transmitter further includes the first serial line interface, the first serial line interface and HDBaseT
Coding module connection；Receiver further includes the second serial line interface, and the second serial line interface is connect with HDBaseT decoder module.
As a preferred embodiment, transmitter further includes infrared receiver end, infrared receiver end and HDBaseT are encoded
Module connection；Receiver further includes infrared emission end, and infrared emission end is connect with HDBaseT decoder module.
As a preferred embodiment, video input interface includes HDMI video input interface and DVI video input
Interface；Video output interface includes HDMI video output interface and DVI video output interface.
As a preferred embodiment, transmitter further includes HDMI ring outgoing interface, HDMI ring outgoing interface and audio-video
Coding module connection.
As a preferred embodiment, transmitter is equipped with the first USB upgrade interface, the first USB upgrade interface and the
The connection of one main control module；Receiver is equipped with the 2nd USB upgrade interface, and the 2nd USB upgrade interface is connect with the second main control module.
As a preferred embodiment, transmitter further includes the first KM (Keyboard Mouse) module, the first KM
Module is connect with HDBaseT coding module；Receiver further includes the 2nd KM module, the 2nd KM module and HDBaseT decoder module
Connection.Using CH9350 chip (USB keyboard mouse turn serial communication control chip), in conjunction with asynchronous serial port feature easy to use,
Realize that USB communication modes between USB keyboard mouse and usb host are extended to the mode of asynchronous serial port (UART), convenient for audio,
Video data integration, realizes the real-time Transmission of KVM signal, can be used for the extension of KVM communication distance and uses.Specifically, KM module
Circuit structure please refers to Fig. 4 and Figure 18.
Specifically, mouse-keyboard is linked into receiver by USB port, and usb data is converted into serial data by receiver,
Then serial data is monitored, into data penetration transmission mode, KVM signal is transferred to transmitter, transmitter is by received mouse
Mark, keyboard data are converted into USB data transmission to the host computer connecting with transmitter.In addition, can also be in transmitter and reception
One matrix switcher is set between device, KVM management mode can be entered by instruction, realization is referred to by mouse-keyboard to input switching
It enables to matrix switcher with Switch Video channel.
As a preferred embodiment, the first control panel module includes panel body, panel body is equipped with aobvious
Display screen, infrared receiving terminal and operation button；Second control panel module is identical as the first control panel modular structure.First control
Panel module and the second control panel module support infrared remote control and key controlled, and it is main that the operation data of user sends first to
Module and the processing of the second main control module are controlled, processing result is then returned into display screen and carries out real-time display.
The modules major function of the audio-video transmission system is as follows:
Main control module: use ST-STM32F103RCT6-TR (LQFP-64) chip, the chip module periphery by
8.000Mhz crystal oscillating circuit, reset circuit, J-LINK burning data interface, storage module, the composition such as serial port module；For
Manage and dispatch the normal operation of other modules；Storage module is for saving current sender EDID, PIP and inside and outside
Audio status avoids loss of data after power down；
Memory: using a low capacity storage chip ATMEL-AT24C02C-SSHM-T (SOIC-8), for described
The user configuration data of transmitter are stored；
First control panel module and the second control panel module: the audio-video transmission system is configured for user
Interactive panel；
Audio ADC/DAC module: it is converted between analog- and digital- format for audio data；
Audio-video coding/decoding module: using the interface of a support 4Kx2K high definition resolution ratio of LATTICE company exploitation
Chip, model sil9575, the chip module periphery are connect by 27.000Mhz crystal oscillating circuit, reset circuit, TMDS input
Mouth circuit, TMDS output interface circuit, I2S audio coding decoding and I2C communication composition；For realizing audio stream and video flowing
Merge and separate, supports audio data being embedded in video flowing, or extract audio data from video flowing, video data and audio
Data keep synchronizing；
HDBaseT data coding module: using a HDBaseT family chip scheme of company, Israel, chip model
For VALENS-VS100TX (LBGA-196), the chip module periphery is by 125.000Mhz crystal oscillating circuit, reset circuit, storage
Storing module, TMDS input interface circuit, HDBaseT output interface circuit, serial port module etc. composition, support by video, audio,
The data such as USB, infrared, serial ports Unified coding is at the HDBaseT frame format for being conducive to transmit at a distance；The chip can be by surpassing five classes
The above type twisted pair transmission and reception are without compression high definition video, audio, internet, power control signal, infrared equal signals；By
In transmission process, audio-video and other signals are not made to compress packing processing, therefore there is no compressions to prolong with what decompression procedure generated
When the time, solve the problems, such as to cause user experience bar poor since normal transmission device transmission delay is excessive.
HDBaseT data decoder module: for support by HDBaseT frame data be decoded into video, audio, USB, it is infrared,
The data such as serial ports；
First KM module and the 2nd KM module: for handling USB mouse keyboard data, in the same of transparent transmission mouse-keyboard data
When parse Keyboard accelerator key data therein；
Video sending module: by high-definition digital input interface and ESD anti-static circuit, HPD plug-and-play circuit, input electricity
Detection circuit is pressed, HDCP agreement decrypts the composition such as circuit；HDMI/DVI vision signal is exported for driving；
Video reception module: for supporting the video input of HDMI and DVI interface, EDID management and HDCP pipe are carried out
Reason；Detection and reception HDMI video signal, carry out HDCP inspection and HDCP encryption and decryption to video, and select from 2 video inputs
Select wherein 1 video data；
First power supply module and the second power supply module: using distributed generation resource framework, and save the cost controls PCB layout simultaneously
Area occupied.The ETA3451D2I (DFN2x2-8L) that chip is provided by ETA realizes that 5V inputs low-voltage and high-current group, voltage packet
Include [email protected], [email protected], [email protected], [email protected].
The workflow of the audio-video transmission system are as follows:
(1) video input interface of transmitter is connect with input signal source by HDMI/DVI wire rod, using surpassing five classes
Twisted pair line connection transmitters and receivers, while transmitter and receiver access power supply, are in normal power supply state；
(2) HDMI/DVI video source accesses, and the first main control module is configured by read port, judges the video of input interface
Format (video format includes HDMI and DVI), and save current input format configuration；
(3) USB upgrade-system is passed through WCH-CH340G (SOP-16) by the first USB upgrade interface upgrade-system firmware
Modular circuit gives the MCU-STM32 core chips firmware updating of the first main control module；
(4) the sil9575 chip of audio/video coding module encodes mould to HDBaseT according to EDID management export vision signal
Block is converted into I2S audio digital signals by ADC audio combing module and is sent to audio/video coding in addition, audio signal is embedded in
In the sil9575 chip of module, external audio source is provided for the insertion of HDMI audio, is then output to HDBaseT coding module, this
Outside, infrared signal and rs 232 serial interface signal are directly inputted into HDBaseT coding module；
(5) audio-video signal, infrared output signal and rs 232 serial interface signal are converted into HDBaseT letter by HDBaseT coding module
Number, and it is transmitted to the HDBaseT decoder module of receiver by network twisted-pair cable；
(6) HDBaseT decoder module receives HDBaseT signal, is decoded as HDMI signal, infrared output signal and serial ports
HDMI signal is simultaneously transferred to audio/video decoding module by signal；
(7) audio/video decoding module is closed after receiving HDMI signal according to EDID management and the output of HDMI/DVI form management
Suitable resolution ratio and signal format to display terminal (such as LED display, LCD display), meanwhile, by the port I2S export number
Word audio signal exports stereo analog audio by DAC digital-to-analogue conversion to DAC module.
Wherein, the first control panel module is mainly used for carrying out the first main control module the switching of configuration input channel, EDID
Management, PIP management and inside and outside Audio conversion；Second control panel module is mainly used for carrying out EDID management, infrared carrier wave choosing
It selects and factory reset function.
Above embodiment is only preferred embodiments of the present invention, cannot be protected with this to limit the utility model
Range, the variation of any unsubstantiality that those skilled in the art is done on the basis of the utility model and replacement belong to
In the utility model range claimed.
Claims (9)
1. a kind of audio-video transmission system, which is characterized in that including transmitters and receivers, the transmitter and the receiver
Connection；
The transmitter includes: video reception module, ADC module, audio/video coding module, HDBaseT coding module, first deposits
It stores up module, the first main control module, the first control panel module and the modules to the transmitter and provides the first of power supply
Power supply module, the audio/video coding module are encoded with the video reception module, the ADC module, the HDBaseT respectively
Module and first main control module connection；First main control module respectively with the first control panel module, the view
Frequency receiving module, the HDBaseT coding module and first memory module connection；The transmitter is additionally provided with video input
Interface, audio input interface and the first RJ45 interface, the video reception module are connect with video input interface, the ADC mould
Block is connect with the audio input interface, and the HDBaseT coding module is connect with the first RJ45 interface；
The receiver includes video sending module, DAC module, audio/video decoding module, HDBaseT decoder module, second deposits
It stores up module, the second main control module, the second control panel module and the modules to the receiver and provides the second of power supply
Power supply module, the audio/video decoding module are decoded with the video sending module, the DAC module, the HDBaseT respectively
Module and second main control module connection；Second main control module respectively with the second control panel module, the view
Frequency sending module, the HDBaseT decoder module and second memory module connection；The receiver is additionally provided with video output
Interface, audio output interface and the 2nd RJ45 interface, the video sending module is connect with the video output interface, described
DAC module is connect with the audio output interface, and the HDBaseT decoder module is connect with the 2nd RJ45 interface；It is described
First RJ45 interface is connect with the 2nd RJ45 interface.
2. audio-video transmission system as described in claim 1, which is characterized in that the first RJ45 interface and described second
RJ45 interface supports POE function of supplying power；The first RJ45 interface is connected by network twisted-pair cable and the 2nd RJ45 interface
It connects；First power supply module is connect with the first RJ45 interface, second power supply module and the 2nd RJ45 interface
Connection.
3. audio-video transmission system as described in claim 1, which is characterized in that the transmitter further includes the first serial interface
Mouthful, first serial line interface is connect with the HDBaseT coding module；The receiver further includes the second serial line interface, institute
The second serial line interface is stated to connect with the HDBaseT decoder module.
4. audio-video transmission system as claimed in claim 3, which is characterized in that the transmitter further includes infrared receiver end,
The infrared receiver end is connect with the HDBaseT coding module；The receiver further includes infrared emission end, the infrared hair
End is penetrated to connect with the HDBaseT decoder module.
5. audio-video transmission system as described in claim 1, which is characterized in that the video input interface includes HDMI video
Input interface and DVI video input interface；The video output interface includes that HDMI video output interface and the output of DVI video connect
Mouthful.
6. such as audio-video transmission system described in any one of claim 1 to 5, which is characterized in that the transmitter further includes
HDMI ring outgoing interface, the HDMI ring outgoing interface are connect with the audio/video coding module.
7. audio-video transmission system as claimed in claim 6, which is characterized in that the transmitter is equipped with the first USB upgrading and connects
Mouthful, the first USB upgrade interface is connect with first main control module；The receiver is equipped with the 2nd USB upgrade interface, institute
The 2nd USB upgrade interface is stated to connect with second main control module.
8. audio-video transmission system as claimed in claim 7, which is characterized in that the transmitter further includes the first KM module,
The first KM module is connect with the HDBaseT coding module；The receiver further includes the 2nd KM module, the 2nd KM
Module is connect with the HDBaseT decoder module.
9. audio-video transmission system as claimed in claim 8, which is characterized in that the first control panel module includes panel
Ontology, the panel body are equipped with display screen, infrared receiving terminal and operation button；The second control panel module with it is described
First control panel modular structure is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821386709.XU CN208739279U (en) | 2018-08-27 | 2018-08-27 | A kind of audio-video transmission system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821386709.XU CN208739279U (en) | 2018-08-27 | 2018-08-27 | A kind of audio-video transmission system |
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| CN208739279U true CN208739279U (en) | 2019-04-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109688361A (en) * | 2018-08-27 | 2019-04-26 | 广州市保伦电子有限公司 | A kind of audio-video transmission system |
| CN111787358A (en) * | 2020-07-30 | 2020-10-16 | 深圳市东明炬创电子有限公司 | IP stream HDMI media codec |
-
2018
- 2018-08-27 CN CN201821386709.XU patent/CN208739279U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109688361A (en) * | 2018-08-27 | 2019-04-26 | 广州市保伦电子有限公司 | A kind of audio-video transmission system |
| CN111787358A (en) * | 2020-07-30 | 2020-10-16 | 深圳市东明炬创电子有限公司 | IP stream HDMI media codec |
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Address after: No. 56 Nanli East Road, Shiqi Town, Panyu District, Guangzhou City, Guangdong Province, 510000 Patentee after: Guangdong Baolun Electronics Co.,Ltd. Address before: 511400 Building 1, industrial zone B, Zhongcun street, Zhongcun street, Panyu District, Guangzhou City, Guangdong Province Patentee before: GUANGZHOU ITC ELECTRONIC TECHNOLOGY Co.,Ltd. |
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