CN106303314A - A kind of wireless audio and video emitter of USB interface - Google Patents
A kind of wireless audio and video emitter of USB interface Download PDFInfo
- Publication number
- CN106303314A CN106303314A CN201610715624.0A CN201610715624A CN106303314A CN 106303314 A CN106303314 A CN 106303314A CN 201610715624 A CN201610715624 A CN 201610715624A CN 106303314 A CN106303314 A CN 106303314A
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- emitter
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- video
- audio
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/38—Transmitter circuitry for the transmission of television signals according to analogue transmission standards
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Multimedia (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The wireless audio and video emitter of a kind of USB interface, is applied to an a kind of binding system.Emitter, is powered by usb interface module and carries out data transmission with PC end.On Bao Jiang company based on RTSP proprietary protocol, carry out Signalling exchange with main frame by WiFi module and audio, video data transmits.The Signalling exchange with PC end application program and the transmission of audio, video data is realized by alternating transmission module.By key-press status monitoring modular Real-time Collection key-press status, short by button is realized pushing away screen, pushing away screen and full frame operation by two states by with long.By signal return module realize touch display end reverse control signal return to PC end function.The duty of emitter is shown in real time by LED display module.Without installing software operation, the present invention can realize that a key is wireless pushes away screen operation, and carry WiFi module and be not take up the wireless network card of PC end so that wireless with screen transmission while, online demand can be met.
Description
Technical field
The present invention relates to wireless audio and video emitter, the wireless audio and video emitter of a kind of USB interface.
Background technology
Along with wireless transmission bandwidth, wireless chip, encoding and decoding algorithm, PC performance, decoding chip etc. aspect in recent years
Technological progress, occurs in that the mode being wirelessly transferred.PC, mobile phone or flat board etc. polytype source wirelessly can be
Screen content is shown on terminal presentation facility with screen transmission.
The shortcoming of which is:
1, the real-time of audio video transmission does not has wired good, has time delay.
2, it is wirelessly transferred because the factor of bandwidth, is substantially all and needs by the way of encoding and decoding, audio, video data to be carried out
Process, could transmit, so the content of terminal demonstration can be variant with source.
3, the stability being wirelessly transferred and confidentiality do not have wired good.
Sum it up, wireless transmission method solves wired inherent defect, bring great convenience to user.As
Really wireless transmission method can also be improved above-mentioned shortcoming, is optimized to close to wired performance, and accomplishes simple to operate,
So wireless transmission method just can bring extraordinary experience to user.
At present, the wireless audio-video transmission technology of main flow is technology based on Wi-Fi, because Wi-Fi uses wide, offer
The producer of chip is many, technology maturation, low cost.And along with the commercialization of 802.11n and 802.11ac agreement so that Wi-Fi transmits
Bandwidth is greatly improved, and the HD video having enough bandwidth to support multichannel encoded in theory transmits simultaneously.
But, on market, most employing technology based on Wi-Fi realizes the product of wireless audio-video transmission, user's body
Testing all do bad, the most all there is following shortcoming in these products:
1, needing to install software on PC, software operation is extremely complex, and the operating experience brought to user is very poor, and user needs
Certain IT background knowledge could this series products that gets up.
2, take the wireless network card of PC so that wireless with screen transmission when, it is impossible to online or can not be the most smooth
Online, limits the online demand of user.
3, polytype terminal is supported complete, polytype terminal include windows PC, MAC OS X PC,
Android mobile terminal and iOS mobile terminal.
4, multi-channel video transmission is supported not, when multi-channel video is simultaneously with screen transmission display, have time delay and Ka Dun.
The emitter of the present invention, is applied to a binding system, is also to use technology based on Wi-Fi to realize wireless sound to regard
Keep pouring in defeated.But, the technology that a binding system is innovated by employing and advanced chip, well solve above lacking
Point.
Summary of the invention
In order to overcome above-mentioned existing issue, the invention discloses the wireless audio and video emitter of a kind of USB interface, its purpose
It is that the means by technology shield a lot of complicated operation so that a user not having any IT background knowledge is at 10 points
The use that in clock, just energy is skilled, the experience of user is the best.Greatly improve efficiency and the fragrance of meeting.
In order to solve the problems referred to above, the technical solution used in the present invention is:
The wireless audio and video emitter of a kind of USB interface, is to be applied to a binding system, it is characterised in that including:
Usb interface module, transmits for power supply and data；
WiFi module, for using Bao Jiang company based on RTSP proprietary protocol and main frame to carry out Signalling exchange and audio frequency and video
Data are transmitted；
Alternating transmission module, for realizing the Signalling exchange with PC end application program and the transmission of audio, video data；
Key-press status monitoring modular, for Real-time Collection key-press status, short by button is realized pushing away by two states by with long
Shield, push away screen and full frame operation；
Mapping block, for mapping out a USB flash disk or CD takes inventory and puts application program at PC end；
Signal return module, for realize touch display end reverse control signal return to PC end function；
LED display module, for the duty of display emitter in real time.
Further, described emitter is directly connected with PC end by usb interface module, thus powers for emitter, sends out
Emitter and PC end carry out audio, video data transmission and Signalling exchange by usb interface module.
Further, described WiFi module is automatically to run Wi-Fi journey during wireless audio and video emitter insertion PC end
Sequence, is set up Wi-Fi with main frame and is connected, reached the standard grade to host report by Wi-Fi, has icon to point out at PC end after successful connection,
LED is had to point out at dongle end and host side.
Further, described alternating transmission module also includes:
Trapping module, is used for capturing screen content and mouse coordinates；
Coding module, processes for the screen content picture captured is made scaling, encodes；
Sampling module, for sampling to the audio frequency that need to transmit；
Modular converter, for changing audio sample rate and data form；
Transport module, passes through Bao Jiang company based on USB HID privately owned HID communications protocol for the audio or video that will handle well
It is transmitted with emitter and mutual signaling.
Further, the key-press status of described key-press status monitoring modular collection is two kinds: length is pressed by with short；
For long by event, emitter is processed as full frame operation；
For short by event, emitter can be according to current RTSP connection status, it is judged that shares for screen or stops sharing operation；
If currently sharing state for screen, then it is judged as that operation is shared in stopping；If currently sharing state for stopping, then judge
Operation is shared for screen.
Further, when described emitter is connected by USB interface with PC end, the emitter USB Mass by standard
Storage agreement maps out a USB flash disk or CD dish at PC end, can i.e. insert, for depositing, the application journey can run at PC end
Sequence.
Further, the duty of described emitter includes: state that electrifying startup state is being connected with main frame,
With main frame successful connection and do not push away screen state and with main frame successful connection and pushing away screen state.
On hardware, emitter solves three key technologies:
One is power consumption, and USB interface power supply capacity is 5V/500mA to the maximum, uses Imx283 chip and the MT7612 mould of low-power consumption
Group, coordinates the Low-power Technology of software to reduce overall power.
Two is Wi-Fi antenna, and Wi-Fi antenna uses onboard PCB dual-band antenna, designs shielding case structure, and layout sets
It is the highest that requirement put by meter and antenna model selection and position.
Three is heat radiation, and by using 6 laminate large area floor file to dispel the heat, and radiation fin mode is dispelled the heat.
The innovation mode used is specific as follows:
1) inserting transmitter device, the PC application program being then stored in transmitter device can run automatically, whether windows system
System or MAC OS system X.
2) emitter is automatically set up Wi-Fi with main frame and is connected, and has icon to point out at PC end, at dongle end after successful connection
LED is had to point out with host side.
3) then press emitter button to realize the wireless screen that pushes away and share.
4) multi-user can independently add and exit, and full screen display, all by emitter button
Realize.
5) main frame is installed the simplest, only need to be connected with display terminal by HDMI or VGA, then connect with the mains to master
Machine electrifying startup can complete.
Accompanying drawing explanation
Fig. 1 is the construction module figure of the present invention.
Detailed description of the invention
The present invention USB interface-based wireless audio and video emitter, is applied to an a kind of binding system, and this system includes:
The application program of PC end, emitter terminals, host side.
The application program of PC end is mainly used in: capture screen content and mouse coordinates, screen scaling process, screen coding,
Sampled voice and audio sample rate conversion.
Emitter terminals is mainly used in: deposit the application program of PC end and the Signalling exchange of PC end application program and audio frequency and video
Data are transmitted, audio, video data are transferred to host side, the touch display end reverse control signal of Receiving Host end transmission and return
Pass to PC end function.
Host side is mainly used in: by wireless network (WiFi) real-time Transmission multi-path high-definition video and audio frequency, build multiple
What terminal and various protocols accessed is wirelessly transferred framework, simultaneously multipath decoding and multichannel picture dividing processing.
PC end application program is pure software exploitation, and including two versions, one is windows PC version, and one is MAC
OS X PC version.
PC end application programming is "Green" software, it is not necessary to installing, program is stored in the USB flash disk that emitter terminals maps out
Or in CD dish, automatically run after inserting emitter.
It is as follows that PC end application program performs step:
S101, startup screen is shared harmony cent and is enjoyed operation, executed in parallel S102 and S105；
S102, capture screen content and mouse coordinates；
S103, makes scaling and processes the screen content captured；
S104, encodes the screen content processed, and performs S107；
S105, samples to audio frequency；
S106, changes audio sample rate and data form, performs S107；
S107, carries out the transmission audio frequency and video number with emitter terminals by Bao Jiang company based on USB HID privately owned HID communications protocol
According to mutual signaling.
Emitter terminals includes hardware and software two parts, and hardware uses the Imx 283 ARM9 platform of freescale, runs
Linux system.Emitter terminals is accessible on windows PC and MAC OS X, it is not necessary to installing driving can run.
Emitter terminals includes: WiFi module, key-press status monitoring modular, LED display module.
Wi-Fi module uses the MT7612 chip of MTK company to realize, and this chip supports 2.4GHz and 5GHz two-band,
Holding 802.11n, 802.11ac agreement, double antenna, maximum rate is up to 867Mbps.Realize Wi-Fi STA function on software, adopt
Signalling exchange and audio, video data transmission is carried out with Bao Jiang company based on RTSP proprietary protocol and main frame.
Key-press status monitoring modular Real-time Collection key-press status, short by button is realized pushing away by two states by with long
Shield, move back screen and full frame operation.
LED display module shows the duty of emitter terminals in real time, and duty includes electrifying startup state, with master
Machine is just in connection status, and main frame successful connection and do not push away screen state, with main frame successful connection and pushing away screen state.
Emitter leads to USB 2.0 interface and is connected with PC, is mapped as USB Composite Device, USB enumeration on PC
Type is all standard, either windows PC or MAC is OS X PC, all need not install and drives, it is achieved free drive is the most slotting
I.e. use.
On Freescale iMX283 platform, realize above-mentioned USB Composite Device by software and drive.
Then driven by USB Composite Device and realize 3 functions:
1) Bao Jiang company based on USB HID proprietary protocol is used, it is achieved with Signalling exchange and the audio frequency and video of PC end application program
The transmission of data.
2) USB flash disk or CD dish, the application of PC end are mapped out by the USB Mass Storage agreement of standard at PC end
Program is just placed in the USB flash disk mapped out or CD dish.
3) by USB HID mouse and the touch agreement of standard, it is achieved touch returning to of display end reverse control signal
PC end function.
Host side includes hardware and software two parts, and hardware uses the Hi3535 platform of HiSilicon, runs linux system
System.Hi3535 chip is a powerful multi-media processing chip, and processor cores is A9 double-core@1GHz, band hardware solution
Code core, maximum support 5 road 1080P30 H.264 videos decode simultaneously.
Host side includes following functional module:
1) built-in WEB page, can log in built-in WEB page by wireless Wi-Fi or wired lan, to the wireless parameter of main frame and
Output parameter is configured.
2) the touch-control USB interface of the USB external touch screen of HOST interface of main frame, gathers the touch control signaling of touch screen,
Return to emitter terminals and PC end, thus the Reverse Turning Control function of touch screen can be realized.
3) emitter is inserted on the USB HOST interface of main frame, it is achieved emitter automatic matching function.
4) upgrade file of main frame is stored in USB flash disk, then USB flash disk is inserted into the USB HOST interface of main frame, it is achieved main frame
Automatically upgrade function.
5) LED display module shows the duty of host side in real time, and duty includes electrifying startup state, with end
End connection status, pushes away screen state and upgrade status.
6) terminal presentation facility optimum resolution adaptation function, can be by reading EDID identification terminal display device
Optimal resolution, then exports with best image resolution.
Three core key technologies of host side:
One, by wireless Wi-Fi real-time Transmission multi-path high-definition video and Audiotechnica
Wi-Fi module uses the BCM43569 chip of company of Botong to realize, and this chip supports 2.4GHz and 5GHz two-band, supports
802.11n, 802.11ac agreement, double antenna, maximum rate is up to 867Mbps, thus ensure that multi-path high-definition transmission of video needs
The big bandwidth wanted.
Realizing Wi-Fi AP function on software, maximum accessible 16 STA, from setting up a privately owned LAWN local area wireless network
Network, it is ensured that the real-time of audio video transmission.
On hardware, by improving transmitting power and receiving sensitivity, Wi-Fi antenna and the radio-frequency feed of BCM43569 chip
Line cabling designs, and radio shielding process etc. mode improves Wi-Fi transmission range and reaches 30 meters of sighting distances.
Two, multiple terminal access technology
Independent research, build multiple terminal, various protocols access be wirelessly transferred framework.
Wherein, emitter terminals uses Bao Jiang company based on RTSP proprietary protocol to access；Fructus Mali pumilae mobile terminal uses compatibility
The agreement of Airplay accesses；Android mobile terminal uses the agreement of Miracast/DLNA to access.Mutually will not between each agreement
Interference, each agreement is controlled and dispatches by host-host protocol dispatching platform, and the unified audio/video flow of final output is given to many matchmakers
Body processing module.
Three, multi-channel video decodes and shot segmentation technologies simultaneously
This portion of techniques is based primarily upon the Hi3535 multimedia process module of HiSilicon and realizes.
Kernel is decoded, it is achieved maximum 4 road 1080P30 decoding video streams by the hardware of Hi3535；
By video and the graphics process kernel of Hi3535, it is achieved 4 screen resolution automatic equal proportion scalings and the segmentation of 4 pictures are aobvious
Show；
Additionally, also realize 1-4 picture dynamic equilibrium switching, double screen list shows HDMI/VGA output, audio frequency real-time decoding and audio frequency and video
Synchronism output, OSD display information superposition etc. function.
The above, only presently preferred embodiments of the present invention, it is not to limit the practical range of the present invention, any familiar
The amendment slightly that this those skilled in the art is made according to the spirit of the present invention, must belong to spirit and scope of the present invention.
Claims (7)
1. the wireless audio and video emitter of a USB interface, it is characterised in that including:
Usb interface module, transmits for power supply and data；
WiFi module, for using Bao Jiang company based on RTSP proprietary protocol and main frame to carry out Signalling exchange and audio frequency and video
Data are transmitted；
Alternating transmission module, for realizing the Signalling exchange with PC end application program and the transmission of audio, video data；
Key-press status monitoring modular, for Real-time Collection key-press status, short by button is realized pushing away by two states by with long
Shield, push away screen and full frame operation；
Mapping block, for mapping out a USB flash disk or CD takes inventory and puts application program at PC end；
Signal return module, for realize touch display end reverse control signal return to PC end function；
LED display module, for the duty of display emitter in real time.
Wireless audio and video emitter the most according to claim 1, it is characterised in that described emitter passes through USB interface mould
Block is directly connected with PC end, thus powers for emitter, and emitter and PC end carry out audio, video data biography by usb interface module
Defeated and Signalling exchange.
Wireless audio and video emitter the most according to claim 1, it is characterised in that, described WiFi module is wireless sound
Video transmitter runs Wi-Fi program when inserting PC end automatically, sets up Wi-Fi with main frame and is connected, by Wi-Fi to host report
Reach the standard grade, after successful connection, have icon to point out at PC end, have LED to point out at dongle end and host side.
Wireless audio and video emitter the most according to claim 1, it is characterised in that described alternating transmission module also includes:
Trapping module, is used for capturing screen content and mouse coordinates；
Coding module, processes for the screen content picture captured is made scaling, encodes；
Sampling module, for sampling to the audio frequency that need to transmit；
Modular converter, for changing audio sample rate and data form；
Transport module, passes through Bao Jiang company based on USB HID privately owned HID communications protocol for the audio or video that will handle well
It is transmitted with emitter and mutual signaling.
Wireless audio and video emitter the most according to claim 1, it is characterised in that described key-press status monitoring modular gathers
Key-press status be two kinds: long press by with short；
For long by event, emitter is processed as full frame operation；
For short by event, emitter can be according to current RTSP connection status, it is judged that shares for screen or stops sharing operation；
If currently sharing state for screen, then it is judged as that operation is shared in stopping；If currently sharing state for stopping, then judge
Operation is shared for screen.
Wireless audio and video emitter the most according to claim 1, it is characterised in that described emitter and PC end pass through USB
When interface connects, emitter maps out a USB flash disk or CD dish by the USB Mass Storage agreement of standard at PC end, is used for
Deposit and can i.e. insert the application program that can run at PC end.
Wireless audio and video emitter the most according to claim 1, it is characterised in that the duty bag of described emitter
Include: state that electrifying startup state is being connected with main frame and main frame successful connection and do not push away screen state and with main frame even
It is connected into merit and is pushing away screen state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610715624.0A CN106303314A (en) | 2016-08-25 | 2016-08-25 | A kind of wireless audio and video emitter of USB interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610715624.0A CN106303314A (en) | 2016-08-25 | 2016-08-25 | A kind of wireless audio and video emitter of USB interface |
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| Publication Number | Publication Date |
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| CN106303314A true CN106303314A (en) | 2017-01-04 |
Family
ID=57614883
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| CN201610715624.0A Pending CN106303314A (en) | 2016-08-25 | 2016-08-25 | A kind of wireless audio and video emitter of USB interface |
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Cited By (3)
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| CN109521987A (en) * | 2019-01-17 | 2019-03-26 | 珠海恒宇新科技有限公司 | USB-HID, MS display system and method |
| CN109656852A (en) * | 2018-12-05 | 2019-04-19 | 郑州云海信息技术有限公司 | A kind of SYS_TF card interface connection control method and system |
| CN110022161A (en) * | 2019-04-23 | 2019-07-16 | 京东方科技集团股份有限公司 | Transmitter, transmitting equipment, transmission device and the wireless method for throwing screen |
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Application publication date: 20170104 |
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