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 PDF

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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
Authority
CN
China
Prior art keywords
emitter
module
video
audio
pc end
Prior art date
Application number
CN201610715624.0A
Other languages
Chinese (zh)
Inventor
李华敏
郑盛
钟文旺
王文利
赖亮延
Original Assignee
深圳市宝疆科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳市宝疆科技有限公司 filed Critical 深圳市宝疆科技有限公司
Priority to CN201610715624.0A priority Critical patent/CN106303314A/en
Publication of CN106303314A publication Critical patent/CN106303314A/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/02Transmitters
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/06Receivers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/38Transmitter circuitry
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/76Television signal recording
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10Small scale networks; Flat hierarchical networks
    • H04W84/12WLAN [Wireless Local Area Networks]

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

A kind of wireless audio and video emitter of USB interface

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.
CN201610715624.0A 2016-08-25 2016-08-25 A kind of wireless audio and video emitter of USB interface CN106303314A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001089156A2 (en) * 2000-05-16 2001-11-22 Sony Corporation Card type network interface, network conference terminal device and system
CN1614535A (en) * 2003-11-06 2005-05-11 技嘉科技股份有限公司 USB interface device for combining recording medium with wireless network card
CN101106681A (en) * 2007-06-26 2008-01-16 广东威创日新电子有限公司 Wireless video transmission device and method
CN201066887Y (en) * 2007-08-01 2008-05-28 青岛海信电器股份有限公司 Wireless communication system and audio/video receiving device with wireless communication function
CN103141087A (en) * 2011-09-14 2013-06-05 巴可有限公司 Electronic tool and methods for meetings
CN103595944A (en) * 2013-11-22 2014-02-19 惠州华阳通用电子有限公司 Wi-Fi display switching device and method among terminals
CN205105317U (en) * 2015-11-13 2016-03-23 赵英杰 Miniature cell -phone cut straightly projecting apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001089156A2 (en) * 2000-05-16 2001-11-22 Sony Corporation Card type network interface, network conference terminal device and system
CN1614535A (en) * 2003-11-06 2005-05-11 技嘉科技股份有限公司 USB interface device for combining recording medium with wireless network card
CN101106681A (en) * 2007-06-26 2008-01-16 广东威创日新电子有限公司 Wireless video transmission device and method
CN201066887Y (en) * 2007-08-01 2008-05-28 青岛海信电器股份有限公司 Wireless communication system and audio/video receiving device with wireless communication function
CN103141087A (en) * 2011-09-14 2013-06-05 巴可有限公司 Electronic tool and methods for meetings
CN103595944A (en) * 2013-11-22 2014-02-19 惠州华阳通用电子有限公司 Wi-Fi display switching device and method among terminals
CN205105317U (en) * 2015-11-13 2016-03-23 赵英杰 Miniature cell -phone cut straightly projecting apparatus

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