CN101887212B - Mobile portable digital video showing device and control method thereof - Google Patents
Mobile portable digital video showing device and control method thereof Download PDFInfo
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- CN101887212B CN101887212B CN2010101919829A CN201010191982A CN101887212B CN 101887212 B CN101887212 B CN 101887212B CN 2010101919829 A CN2010101919829 A CN 2010101919829A CN 201010191982 A CN201010191982 A CN 201010191982A CN 101887212 B CN101887212 B CN 101887212B
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Abstract
The invention discloses a mobile portable digital video showing device, which comprises a player module, an optical driver module, a projection module, a sound module and a control panel, wherein the player module and the optical driver module are used for acquire audio and video data stored in a built-in hard disk or an external storage device and an optical disk medium, and performing decoding and digital-analog conversion on the audio and video data to form audio and video signal outputs respectively; the projection module and the sound module are connected with the player module and the optical driver module respectively, and are used for receiving the video signals or audio signals sent from the player module and the optical driver module to perform display output; and the control panel is connected all the modules and is used for controlling and operating each module. The invention also discloses a method based on the video showing device. The showing device has a plurality of types of audio and video showing modes, powerful functions, a small volume and strong portability, can perform selective treatment on the audio and video signals, has a function of receiving external audio and video signals, is provided with a built-in sound box and an external sound box to realize high-power field showing, is suitable to be used on various occasions such as indoor and outdoor places and the like, and has strong practicability.
Description
Technical field
The present invention relates to a kind of digital multimedia projection technology, particularly a kind of mobile portable digital video showing device and projection control method.
Background technology
At present, the digital audio/video playback equipment emerges in an endless stream to mobile phone, PMP etc. from PC, portable player.People are many-sided, multi-level to the demand of playing audio/video.For example portable equipment such as PMP, mobile phone is easy to carry, and is fit to watch whenever and wherever possible; Main equipment such as PC, digital television can be given the strong visual stimulus of listening, and expression effect is also better.Different crowds is also different to the demand of playing audio/video, for the student, crowds such as working clan, PC, Digital Television, handheld device promptly can satisfy their demand, televisor just can satisfy the demands for friend peasant, and can appreciate a kind of especially good enjoyment of audio/video program after for the friend who likes the field to play, playing, but under field condition, audio ﹠ video equipment is at volume, function, aspects such as effect all can not well satisfy play friend's demand of vast field, function is powerful more, it is big that the equipment that sharpness is high often is accompanied by volume, accessory is many, carries just inconvenient.
For the playback equipment of portable audio frequency and video projecting device as hand-helds such as MP4, PMP, at first be that screen is little, displeasant eyes are watched for a long time, and to give people's sensation at aspects such as picture, audios be not very strong, and the memory capacity of equipment is less, the acquiring way of audio/video information mainly is to link to each other with host computer, the multimedia messages resource of host computer is copied in the playing device play, and is more loaded down with trivial details.In present mobile portable playing device, because the restriction of factors such as system processor function and volume, cause the playing device function singleness, bulky, be not easy to carry, that capacity of memory device is little etc. is all multifactor, develops therefore that a kind of playing function is powerful, audio visual effect good, the audio frequency and video projecting device of mobile portable is just necessary.
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention is: solve present audio frequency and video projecting device complex operation, volume is big, carry inconvenience, the problem that playing function is single, and raising audio visual effect, increase capacity of memory device, be suitable for education and instruction, enterprises and institutions, out multiple occasion such as play is used.
(2) technical scheme
In order to solve the problems of the technologies described above, the invention provides a kind of mobile portable digital video showing device, comprising:
Player module is used for obtaining the audio, video data of built-in hard disk or external memory device, and it is decoded and digital-to-analog conversion is handled, and forms audio-video signal and output;
CD-ROM module is used to obtain the audio, video data of CD media storage, and it is decoded and the digital-to-analog conversion processing, forms audio-video signal and output;
Projection module links to each other with CD-ROM module with described player module, is used to receive the vision signal that described player module and CD-ROM module send and shows output;
Speaker module links to each other with CD-ROM module with described player module, is used for audio signal output with the output of described player module and CD-ROM module to play;
Control panel links to each other with described player module, CD-ROM module, projection module and speaker module, is used for described each module of control operation.
Wherein, described video projection device also comprises: the cabinet housing module is used for supporting the described player module of installation, CD-ROM module, projection module, speaker module and control panel.
Wherein, described control panel comprises:
The projection control section is used to control the output of the vision signal of described player module and CD-ROM module transmission;
The player control section is used to receive the operational order that is used for described player module, and the input interface that connects from the external world obtains audio, video data and it is handled and plays;
The audio frequency and video control section is used for described player module, CD-ROM module and outer signal are carried out selective control, and the audio-video signal after will selecting outputs to described projection module and speaker module with output.
Wherein, described projection control section comprises:
VGA video input interface and external audio frequency signaling interface are used to receive the audio-video signal of external input;
The control button is used for the described projection module of control operation.
Wherein, described player control section comprises:
The control button is used for controlling the various operations of described player module playing audio-video process;
Input interface, it comprises USB and memory card interface, is used to receive the audio, video data input mode of various ways.
Wherein, described audio frequency and video control section comprises:
Controller U4 is used to accept the instruction that the user selects audio-video signal, and instruction is handled and carried out corresponding operating according to user's request;
Video signal selector U2 is used to receive the control signal of described controller U4 so that the vision signal of input is selected output;
Controller U5, the control signal that is used to receive described controller U4 is carried out field signal control to guarantee the correct transmission of vision signal;
Amplifier U3 is used for the vision signal of input is carried out processing and amplifying, to guarantee the transmission of video signals quality;
Video signal receiver U6 is used to receive the vision signal after process is selected and exports this signal;
Audio frequency outlet selector U8 and U12 are used for selecting output from the sound signal of described CD-ROM module, player module and the input of external VGA signal;
Digital potentiometer U7 and U10 are used to regulate the volume of control audio signal;
Switch SW 4 is used to control the ON/OFF of described CD-ROM module.
Wherein, described speaker module comprises power unit and power amplifying part, and described power unit is used for to the speaker module power supply, and described power amplifying part is used to amplify described player module and next sound signal and the output of CD-ROM module transmission; Described speaker module comprises built-in speaker and external speaker.
The present invention also provides a kind of projection control method based on mobile portable digital video showing device, may further comprise the steps:
Described player module is transferred to described projection module after with the audio, video data of built-in hard disk or external memory device stored decoding conversion and speaker module is exported;
Described CD-ROM module is decoded the audio, video data of CD media stored, and the conversion back is transferred to described projection module by data line and speaker module is exported;
Described projection module is optionally exported the vision signal of described player module and CD-ROM module conveying;
Described speaker module receives the sound signal of described player module and CD-ROM module, and described sound signal is carried out power amplification, outputs to built-in speaker or external speaker.
Wherein, described projection module is selected video input apparatus by video switch by key control: player module or CD-ROM module or external VGA equipment, and carry out video playback.
Wherein, described speaker module uses change-over switch control to select built-in speaker or external speaker.
(3) beneficial effect
Technique scheme has following advantage: have multiple audio frequency and video projection mode, powerful, volume is small and exquisite, and is portable strong, and the present invention can carry out the selectivity processing to audio-video signal; Has the function that receives outside audio-video signal; Interior external external speaker not only can be realized high-power open-air projection; Also be fit to multiple occasions such as education and instruction, enterprises and institutions, indoor, open-air projection and use, can satisfy user's multiple demand, practicality is stronger.
Description of drawings
Fig. 1 is the synoptic diagram of the mobile portable digital video showing device of the embodiment of the invention;
Fig. 2 is each control panel part synoptic diagram of the embodiment of the invention;
Fig. 3 is the control panel controller circuitry figure of the embodiment of the invention;
Fig. 4 is the control panel key circuit figure of the embodiment of the invention;
Fig. 5 is the control panel video switch circuit figure of the embodiment of the invention;
Fig. 6 is the control panel audio control circuit figure of the embodiment of the invention;
Fig. 7 is the speaker module built-in speaker control circuit figure of the embodiment of the invention;
Fig. 8 is the control panel vision signal switching switch circuit figure of the embodiment of the invention;
Fig. 9 is the speaker module power circuit diagram of the embodiment of the invention;
Figure 10 is the control panel power circuit diagram of the embodiment of the invention;
Figure 11 is the control panel program flow diagram of the embodiment of the invention.
Wherein, 1: projection module; 2: control panel; 3: CD-ROM module; 4: player module; 5: speaker module; 6: the cabinet module; 7: the projection control section; 8: the player control section; 9: the audio frequency and video control section.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
The synoptic diagram of the mobile portable digital video showing device that Fig. 1 provides for the embodiment of the invention, as shown in Figure 1, this mobile portable digital video showing device mainly comprises: player module 4, be used for the digital audio/video data that get access to are decoded and the digital-to-analog conversion processing, form analog audio-video signal and output; CD-ROM module 3 is used for the digital audio/video data that get access to from optical disk medium are decoded and the digital-to-analog conversion processing, forms analog audio-video signal and output; Projection module 1 is used to receive and export the vision signal of player module 4 and CD-ROM module 3 outputs and output to the external world; Speaker module 5 is used for the sound signal of player module 4 and CD-ROM module 3 inputs is exported; Control panel 2 is used for the Play Control to projection module 1, to the operation of player module 4 control, and the vision signal that outputs to projection module 1 is selected and the control of whole device sound.
The mode of the playing audio-video data of present embodiment digital audio/video playing device can be divided into three kinds, a kind of is that the hard disk that carried from self inside by player module 4 or external USB or memory card interface memory device obtain audio, video data to play, concrete workflow is: player module 4 at first will be stored on the built-in hard disk or the digital audio/video data that are stored in the external USB equipment are converted to the audio, video data that can transmit on data line, this audio, video data is sent in projection module 1 and the speaker module 5 again, projection module 1 projects extraneous output with video image after the video data of receiving is operated through a series of optical systems, and speaker module 5 is exported the sound signal that receives through digital-to-analog conversion and amplification filtration treatment.Second kind be by CD-ROM module to input wherein be that the audio, video data of storage medium carries out digital-to-analog conversion, decompression convert that the data that can transmit are delivered to projection module 1 with audio, video data respectively and speaker module 5 is exported to again on data line with the CD.The third vision signal that to be the audio, video data input/output function that carries by projection module 1 have the VGA output device with the external world is as input, and projection module 1 is operated laggard line output with the VGA signal of external world's input through a series of optical systems.
In the present embodiment, because the equipment of output video has only 1 one kinds of projection modules, and the equipment of input video has three kinds of player module 4, CD-ROM module 3 and external VGA equipment, therefore needs the switching of three kinds of vision signals of control.Fig. 2 is a control panel, and the user can realize the blocked operation of three kinds of vision signals by the audio frequency and video switching part of this part.Projection module 1 can be input to its inner vision signal under the autoscan identification current state after this portable digital video showing device opening power, if signal input is arranged then this signal is exported after treatment, if do not have the vision signal input then wait for the input of vision signal.
If the user wants to watch video that the corresponding module power supply opening can be watched by player module 4, CD-ROM module 3 under the state of importing without any signal, if the user wants to watch video by external VGA signal then the VGA signal inserted projection module 1 can watch; If it is current at CD-ROM module 3 displaying videos, and when not having external VGA signal, the user wants to switch to player module and watches then and should get final product by the DVD on/off key, can watch by the VGA key if there is external VGA signal user by DVD ON/OFF key the CD-ROM module vision signal to be closed again earlier; If current at player module 4 output videos, the user then directly can realize by DVD on/off key or VGA key when wanting to watch by CD-ROM module 3 or external VGA signal; If same user watches under external VGA state and wants to switch to CD-ROM module 3 or player module 4 is watched, directly can realize by DVD on/off key or HDD key.
Regulate for the conversion and the volume that realize sound signal, the audio frequency and video switching part of Fig. 2 control panel can be realized this function.If the user will then should be transferred to the built-in speaker gear with audio amplifier inside/outside button by the built-in speaker output audio signal and get final product,, the user gets final product if will should being transferred to the external voice box gear with audio amplifier inside/outside button by the external voice box output audio signal; No matter at built-in speaker still under the state at external voice box the user by being the volume of scalable output sound by V+ and V-key.
Control panel shown in Figure 2 also comprises projection control section 7 and player control section 8.Projection control section 7 is responsible for regulating the simple control operations such as image display effect of projection module 1, and external in addition VGA signal input interface is also in this part; Player control section 8 comprises USB, OTG and SD/MMC/MS/XD storage card input interface, in addition buttons such as other control button and pilot lamp.
In the present embodiment, control panel 2 is realized control function by circuit board.The control of video handoff functionality that this circuit board has and the program flow diagram of audio-frequency function are as shown in figure 11.Described control of video handoff functionality and audio frequency control function flow process are: earlier controller U4 is carried out the electrification reset operation after the portable digital video showing device energized, remove unnecessary interfere information in the controller U4, carry out then initialization operation with the register of each use in the controller U4 etc. empty, operation such as assignment; Program determined whether to switch the order input of audio-video signal or increase and decrease volume after initialization was finished by the scanning of button SW0, SW1, SW2, SW3, if have then this order carried out anti-shake test to determine that this order is arranged really, then carry out corresponding operation if there is order to send really, whether program turns back to scanning after finishing has in the circulation of switching signal order and increase and decrease audio volume command, moves in circles to guarantee system's operate as normal with this.
In the present embodiment, the switching signal of video is by being that the circuit design of controller realizes with the U4 among Fig. 3.U4 is the controller of audio frequency and video control circuit part, and wherein Y1, C13 and C14 form the required crystal oscillating circuit of U4 operate as normal; C15 is by connecting the electrification reset function that power supply VCC has realized U4, and the interfere information after powering on removing before the operate as normal makes the U4 operate as normal; KEY[3..0 wherein] be the button input bus, this bus is connected on SW0, SW1, SW2 and the SW3 among Fig. 4, and the user realizes the increase of player projection, external VGA projection and sound respectively by different buttons and reduces; Bus SEL[2..0 among Fig. 3 in addition] be responsible for will output control signal be transferred to the switching of relevant position among Fig. 5, Fig. 6 and then control of video, sound signal.
In order to realize the switching of vision signal, at first signal is input to KEY[3..0 among Fig. 3 by the SW0 among Fig. 4 and SW1 button] bus, through output control signal corresponding after the processing of controller U4 to the SEL[2..0 of Fig. 5] in the bus, carry out among the operational amplifier U3 through after the selection of device U2 corresponding video signals being outputed to that signal amplifies, filtration treatment, send signal to VGA output interface U6 then, U6 exports video signal transmission in projection module 1; The signal that wherein said VGA input interface U1 is imported is from player module 4 and external VGA signal; R2 and D6 are that input matching circuit is to drive and to regulate outputting video signal among Fig. 5; Wherein R1, R4, D5 form output matching circuit so that the vision signal after the process amplifier is driven and regulates; Figure 5 shows that in the RGB tristimulus signal of VGA signal the wherein realization circuit of one road signal output, other two-way are identical with this circuit.
In addition because singularity the present invention of 1 pair of vision signal input mode of projection module is divided into VGA class and composite video class with vision signal, described VGA class signal is the vision signal of player module 4 and the output of external VGA signal, composite video signal is the vision signal of CD-ROM module 3 outputs, adopt switch SW 4 among Fig. 8 to control the switch of CD-ROM module 3 vision signals for solving problem the present invention that above-mentioned two class signals switch, projection module 1 can carry out the VGA style number and composite video class vision signal is switched after the DVD on/off key in pressing control panel, and it is just effective only to switch player module 4 and external VGA vision signal under the situation that the vision signal of CD-ROM module 3 is closed again.
In the present embodiment, the output of sound signal is undertaken by speaker module 5, owing to there being 3 two kinds of audio-source of player module 4 and CD-ROM module to have only a kind of audio output system, so the output of sound signal selects problem just to realize by audio frequency outlet selector U8 and the U12 of Fig. 6.Two sound channels about the sound signal of player module 4 and CD-ROM module 3 outputs is divided into, enter respectively among audio frequency outlet selector U8 and the U12, and the signal source of definite needs output under the control of controller U4, signal is outputed to the adjusting of carrying out volume among digital potentiometer U7, the U10 respectively, enter afterwards and carry out power amplification in the power amplifier circuit of forming by U9 and U11, output to then in the sound system 5.
Wherein said controller U4 is by bus SEL[2..0] act on audio frequency outlet selector U8 and U12 and then sound signal is carried out the control of selectivity place; Described controller U4 is by bus VOL[2..1] act on digital potentiometer U7 and the U10 and then and control volume; R7, R8, R9, R11, R12 and R13 are to carrying out Filtering Processing by the sound signal of player module 4 and CD-ROM module 3 inputs among Fig. 6; What wherein R10 and R14 formed is that the audio frequency output matching circuit is to drive and to regulate sound signal.
In the present embodiment, control panel and the required power supply of speaker module 5 work are realized by Fig. 9.Among Fig. 9 T1 for transformer with the 220V 50Hz alternating current transformation of input after by bus+VDC and-VDC provides its work required power supply for speaker module 5; Described bus+VDC also provides power supply by the d-c transformer Z1 among Figure 10 for control panel; Diode D1, D2, D3 and D4 utilize its unidirectional conducting principle to carry out rectification among Fig. 9, capacitor C 1, C2, C3, C4, C5, C6, C7, C8, C9, C10 utilize its energy storage characteristics that power supply is carried out Filtering Processing, obtain needed output voltage through behind these devices; C11 and C12 carry out Filtering Processing to the voltage of exporting among Figure 10 provides power supply to be embodied as control panel.
The all or part of step of realization said method embodiment can be finished by the relevant hardware of programmed instruction, and aforesaid program can be stored in the computer read/write memory medium, and this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvement and replacement, these improvement and replacement also should be considered as protection scope of the present invention.
Claims (9)
1. a mobile portable digital video showing device is characterized in that, comprising:
Player module (4) is used for obtaining the audio, video data of built-in hard disk or external memory device, and it is decoded and digital-to-analog conversion is handled, and forms audio-video signal and output;
CD-ROM module (3) is used to obtain the audio, video data of CD media storage, and it is decoded and the digital-to-analog conversion processing, forms audio-video signal and output;
Projection module (1) links to each other with CD-ROM module (3) with described player module (4), is used to receive the vision signal that described player module (4) and CD-ROM module (3) send and shows output;
Speaker module (5) links to each other with CD-ROM module (3) with described player module (4), is used for audio signal output with the output of described player module (4) and CD-ROM module (3) to play;
Control panel (2) links to each other with described player module (4), CD-ROM module (3), projection module (1) and speaker module (5), is used for described each module of control operation;
Described control panel (2) comprising:
Projection control section (7) is used to control the output of the vision signal of described player module (4) and CD-ROM module (3) transmission;
Player control section (8) is used for receiving the operational order be used for described player module (4), and the input interface that connects from the external world obtains audio, video data and it is handled and plays;
Audio frequency and video control section (9) is used for described player module (4), CD-ROM module (3) and outer signal are carried out selective control, and the audio-video signal after will selecting outputs to described projection module (1) and speaker module (5) with output.
2. mobile portable digital video showing device as claimed in claim 1, it is characterized in that, described video projection device also comprises: cabinet housing module (6) is used for supporting installation described player module (4), CD-ROM module (3), projection module (1), speaker module (5) and control panel (2).
3. mobile portable digital video showing device as claimed in claim 1 is characterized in that, described projection control section (7) comprising:
VGA video input interface and external audio frequency signaling interface are used to receive the audio-video signal of external input;
The control button is used for the described projection module of control operation (1).
4. mobile portable digital video showing device as claimed in claim 1 is characterized in that, described player control section (8) comprising:
The control button is used for controlling the various operations of described player module (4) playing audio-video process;
Input interface, it comprises USB and memory card interface, is used to receive the audio, video data input mode of various ways.
5. mobile portable digital video showing device as claimed in claim 1 is characterized in that, described audio frequency and video control section (9) comprising:
Controller (U4) is used to accept the instruction that the user selects audio-video signal, and instruction is handled and carried out corresponding operating according to user's request;
Video signal selector (U2) is used to receive the control signal of described controller (U4) so that the vision signal of input is selected output;
Controller (U5), the control signal that is used to receive described controller (U4) is carried out field signal control to guarantee the correct transmission of vision signal;
Amplifier (U3) is used for the vision signal of input is carried out processing and amplifying, to guarantee the transmission of video signals quality;
Video signal receiver (U6) is used to receive the vision signal after process is selected and exports this signal;
Audio frequency outlet selector (U8, U12) is used for selecting output from the sound signal of described CD-ROM module (3), player module (4) and the input of external VGA signal;
Digital potentiometer (U7, U10) is used to regulate the volume of control audio signal;
Switch (SW4) is used to control the ON/OFF of described CD-ROM module (3).
6. mobile portable digital video showing device as claimed in claim 1, it is characterized in that, described speaker module (5) comprises power unit and power amplifying part, described power unit is used for to speaker module (5) power supply, and described power amplifying part is used to amplify described player module (4) and next sound signal and the output of CD-ROM module (3) transmission; Described speaker module (5) comprises built-in speaker and external speaker.
7. based on the projection control method of each described mobile portable digital video showing device among the claim 1-6, it is characterized in that, may further comprise the steps:
Described player module (4) is transferred to described projection module (1) after with the audio, video data of built-in hard disk or external memory device stored decoding conversion and speaker module (5) is exported;
Described CD-ROM module (3) is decoded the audio, video data of CD media stored, and the conversion back is transferred to described projection module (1) by data line and speaker module (5) is exported;
Described projection module (1) is optionally exported the vision signal of described player module (4) and CD-ROM module (3) conveying;
Described speaker module (5) receives the sound signal of described player module (4) and CD-ROM module (3), and described sound signal is carried out power amplification, outputs to built-in speaker or external speaker.
8. projection control method as claimed in claim 7 is characterized in that, described projection module (1) is selected video input apparatus by video switch by key control: player module (4) or CD-ROM module (3) or external VGA equipment, and carry out video playback.
9. projection control method as claimed in claim 7 is characterized in that, described speaker module (5) uses change-over switch control to select built-in speaker or external speaker.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101919829A CN101887212B (en) | 2010-05-26 | 2010-05-26 | Mobile portable digital video showing device and control method thereof |
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| CN2010101919829A CN101887212B (en) | 2010-05-26 | 2010-05-26 | Mobile portable digital video showing device and control method thereof |
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| CN101887212A CN101887212A (en) | 2010-11-17 |
| CN101887212B true CN101887212B (en) | 2011-12-28 |
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| CN2010101919829A Expired - Fee Related CN101887212B (en) | 2010-05-26 | 2010-05-26 | Mobile portable digital video showing device and control method thereof |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102183872B (en) * | 2011-04-28 | 2013-09-04 | 深圳市百泰实业有限公司 | Projection sound and data transmission method used by same |
| CN108200456A (en) * | 2017-12-29 | 2018-06-22 | 重庆洪深现代视声技术有限公司 | The remote control of ASI code stream equipments can intelligently be switched |
| CN110994717A (en) * | 2019-11-28 | 2020-04-10 | 徐州苏创信息技术有限公司 | Multifunctional charging device for electronic product |
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| CN100530148C (en) * | 2005-12-30 | 2009-08-19 | 鸿富锦精密工业（深圳）有限公司 | Audio playing system and notebook computer applied |
| CN2879245Y (en) * | 2006-03-29 | 2007-03-14 | 万钟济 | Projector having computer function |
| CN201044172Y (en) * | 2007-04-09 | 2008-04-02 | 海尔集团公司 | Portable DVD |
| CN201114350Y (en) * | 2007-09-26 | 2008-09-10 | 东莞常禾电子有限公司 | Portable multimedia playing device with ultra-heavy and low-voice |
| CN201222362Y (en) * | 2008-06-20 | 2009-04-15 | 陈敏 | Stereo MP3 audio player with Bluetooth wireless transmission function |
| CN201489262U (en) * | 2009-06-24 | 2010-05-26 | 武汉海恒化诚科技有限责任公司 | Multi-media all-in-one machine |
| CN101656089B (en) * | 2009-09-11 | 2012-02-22 | 中国农业大学 | Apparatus and method for playing digital audio and video |
| CN201654441U (en) * | 2010-05-20 | 2010-11-24 | 中国农业大学 | Digital video screening device |
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