CN101291277B - Multimedia information publishing method based on wireless network - Google Patents

Multimedia information publishing method based on wireless network Download PDF

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Publication number
CN101291277B
CN101291277B CN2008100674649A CN200810067464A CN101291277B CN 101291277 B CN101291277 B CN 101291277B CN 2008100674649 A CN2008100674649 A CN 2008100674649A CN 200810067464 A CN200810067464 A CN 200810067464A CN 101291277 B CN101291277 B CN 101291277B
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multimedia
data
terminal unit
multimedia information
wireless
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CN101291277A (en
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郭泽辰
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Shenzhen Hongdian Technologies Corp
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Shenzhen Hongdian Technologies Corp
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Abstract

The invention discloses a multimedia information issue method based on a wireless network, comprising: firstly, multimedia information data and play lists are edited through a multimedia information data center and stored into a data service center database; secondly, the multimedia information data is transmitted to a wireless data terminal unit and then played through a multimedia display screen. When the data is played, multimedia data information is kept updated and synchronous simultaneously and preferential play lists are processed. The method makes a multi-play terminal to play smooth,timely, reliable and intelligent information programs, particularly creates strong visual effect due to the play synchronicity of the multi-play terminal, and can meet the high-quality requirements of information issue of different industries and situations and make people enjoy the interest of the wireless information world all the time.

Description

A kind of multi-media information distribution method based on wireless network
Technical field
The present invention relates to a kind of multi-media information distribution method, particularly relate to a kind of multi-media information distribution method based on wireless network.
Background technology
Development along with information industry and multimedia industry, and the continuous popularization of radio network technique and wireless mobile telecommunication technology, wireless network media and wireless network advertisement progressively become a kind of emerging information mode of propagation, compared irreplaceable advantage with conventional ads with traditional media, particularly display screen and wireless terminal product combines closely, in some special public places, such as public transit system, taxi, market, station, stock exchange, hospital, can be used widely in places such as government department, enjoy facility and enjoyment that the wireless network revolution brings.
Generally speaking, there are two kinds of forms in application in these place multimedia systems at present, a kind of is the multimedia on-line system, and promptly the multimedia control card directly links to each other with information program center operations processing terminal, is in same local the connection, this implementation is fairly simple, program updating is convenient, speed is fast, if but there are a plurality of playback terminals, then need the special messenger playing programs is carried out synchronously, increase artificial probability of errors like this, and need expend bigger resource for computer system.
Another application form is the multimedia off-line system, this off line is used also three kinds of implementations on the different meanings, first kind of implementation is that the program that will play edits and be stored in the multimedia control card in advance, though this implementation has been saved human resources and maintenance cost, but because programme content is fixed, update mode is dumb, in case and system opens, all terminals such as will uninterruptedly play at the restriction of factor, it generally is applied in the not frequent place of some information updatings, such as the wait to see the doctor quotation screen in hall of hospital, show some fixedly pharmaceutical information, can not change in a short time; Though second kind of implementation also is a kind of wireless transmission, be that the form with SMS short message and ultrashort wave wireless digital broadcasting station transmits data, the cost height, exploitativeness is poor; The third implementation is that the multimedia control card is combined with wireless terminal product, this wireless terminal has Data Receiving and sending function, obtain programme information by wireless terminal from information centre's database, and deposit program information data in the multimedia control card, realize off-line working truly.
Though first kind of implementation realization technology of multimedia on-line system and multimedia off-line system is fairly simple, its common drawback is lack of wisdom, and a plurality of terminal realization information is play difficulty synchronously.Second kind of implementation of multimedia off-line system also is a kind of of wireless data transmission, when wherein SMS messaging breath mode does not require the real-time transfer of data in system, it is a kind of selection preferably, but be not suitable for acquisition system and require the situation that real-time is higher, data volume is bigger, the phenomenon that loss of data is arranged in a large amount of uses often, this mode is with the same relatively flexibly by GPRS, cdma wireless network data transmission mode, and this is its advantage wherein.Adopting the ultrashort wave wireless digital broadcasting station to carry out wireless data transmission in addition drops into huge at the construction radio station initial stage, it is big disturbed by thunder and lightning, be subjected to the ionosphere variable effect big, communication is subjected to co-channel interference, third order intermodulation interference and radio call, transfer of data, electric equipment to disturb and be on the rise, it is strict that country's resource of frequency range is examined management, available bandwidth is limited, is generally more early stage unavoidable scheme, does not recommend substantially now to use.The carrier of the third implementation of multimedia off-line system is a wireless network, playback terminal moves that flexibility is bigger, and input cost is low, is applicable to mobile big, the demanding occasion of a plurality of playback terminal synchronous playing, but wireless network also is subjected to the influence of external environment easily, as the electromagnetic interference of electronic equipment, barrier, base station range, transmission ranges etc. when information data amount or intensity transmission are big, will make the information program play quality can not get guaranteeing.
It is 200510045582.6 that Chinese invention patent ublic specification of application CN 1984319A discloses number of patent application, name is called the technical scheme of " on-line advertisement on taxi dissemination method and system thereof ", it mainly is applicable to taxi LCD ad distribution occasion, proposed on taxi, to install vehicle-mounted machine with wireless communication function, the method of advertising programme issue is carried out at the advertising programme center by wireless network vehicle-mounted machine on taxi, this scheme is by the audio frequency and video advertising programme of advertising programme center layout being compiled into the program file of digital coding stream medium data form, then the program file behind minute frame is judged whether to send program file to vehicle-mounted machine by the presence of window framing according to each ride vehicle-mounted machine of reading in, it comprises advertising programme transmission preparation, program transmission, programme transmission and playing programs four-stage, adopted encrypting and decrypting in the program transmission stage, the inefficacy frame retransmits, breakpoint transmission mechanism, when turning down, taxi valuation board begins broadcast program, in the programme transmit stage, the program that immobilized substance and playing sequence are formulated in the advertising programme center sends vehicle-mounted machine to, submitting to LCD screen according to the listing order according to the corresponding program file stream medium data of program file numbering extraction in the playing programs stage plays, the advertising programme center stops this vehicle-mounted machine is sent the program file data and revises this ride program state table after receiving a program file, and advertising programme central transmission server judges whether to continue to send the program file data to vehicle-mounted machine according to the state and the listing of ride vehicle-mounted machine in proper order then.By this series mechanism, this scheme is in order to make taxi can obtain advertising programme in time, reliably, and it is mobile big to solve taxi, blindly plays, and needs the inconvenience of fixed point downloads ad program and can not grasp the problem of broadcast situation.
By as can be seen to the analysis of the whole file of above patent, though this ad distribution scheme has solved the flexibility of mobile terminal playing advertisements program and the property controlled to a certain extent by means of mobile radio network, but owing to adopt the stream data transmission of Streaming Media, its edge joint is received the mode of limit broadcast not to because of wireless network environment is unstable information being sent, quality during broadcast is affected and proposes the reliable technique solution, like this, in application, will produce as terminal electronic display screen blank screen overlong time, phenomenons such as multimedia messages is play not smooth and can not in time be provided, and the video image quality is unintelligible.And can't realize the demand when the requirement of many station terminals is not subjected to the region limits synchronization to play same program.Technique scheme just can not satisfy when some special dimensions and occasion have these high requests.
Summary of the invention
The technical problem to be solved in the present invention is on the basis of the existing wireless dissemination method of multimedia off-line system, the flexibility and the reliability of the issue of reinforcement information, propose a kind ofly to guarantee that the multimedia messages program can in time issue, the multi-media information distribution method that high-quality is play is to realize that the rendition list dynamically updates, emergence message is handled and multiple terminals program synchronous playing.
In order to solve the problems of the technologies described above, the present invention has overcome the limitation and the non intelligent property of multi-media information distribution method in the prior art, and can't realize dynamically updating, can't emergence message handle and can't provide a kind of multi-media information distribution method in the shortcoming of multiple terminals program synchronous playing based on wireless network.
The present invention is achieved by the following technical solutions: implement a kind of multi-media information distribution method based on wireless network, described method comprises:
1., the multimedia information data center works out multimedia information data and playlist, the storage after establishment is handled is to the data service center database;
2., multimedia information data is transferred to the wireless data terminal unit,
A. reach the standard grade in the wireless data terminal unit, operates when carrying out once the school, and send the notice of reaching the standard grade to data service center simultaneously;
B. data service center carries out alternately with the wireless data terminal unit after detecting the notice of reaching the standard grade, and judges more new situation of playlist;
C. up-to-date playlist and corresponding multimedia information data are downloaded from data service center in the wireless data terminal unit;
D. the up-to-date playlist that will download and corresponding multimedia information data are stored in the multimedia information data control card;
3., the multimedia information data control card is by the embedded management software control multimedia display screen play multimedia information on it;
4., when 3. step carries out, the wireless data terminal unit is remaining the information interaction with data service center, when new multimedia data information issues, keep step broadcast 3., download up-to-date playlist and corresponding multimedia messages content simultaneously, and a timer is set, when the wireless data terminal unit can carry out the school at regular intervals according to timer, after during the school, the playback terminal unification is according to up-to-date playlist synchronous playing on the same group;
5., the preferential multimedia messages that is stored on the multimedia information data control card preferentially plays according to effectual time,
Described multimedia play terminal comprises wireless data terminal unit, multimedia information data control card and multimedia display screen, multimedia information data is responsible for receiving and sending in the wireless data terminal unit, carry out alternately with data service center and multimedia information data storage card, the multimedia information data control card is responsible for the multimedia information data that receives is stored, and controls multimedia display screen by the embedded Control software of operation on it and play.
Data service center and the wireless data terminal unit of step described in 2. carries out alternately, judge more new situation of playlist, if the playlist of multimedia information data control card storage is not a playlist up-to-date in the data service center database, then up-to-date playlist and corresponding multimedia information data are downloaded from data service center in the wireless data terminal unit.
When the 4. described wireless data terminal of step unit can carry out the school at regular intervals according to timer, when sending the school, the wireless data terminal unit asks, and the record current time,
A. arrive clock check at interval the time, the wireless data terminal unit is if respond when receiving the school that data service center returns in setting-up time, and correcting local time then is according to the identical program of the dividing time-steps synchronous playing of playlist;
B. arrive clock check at interval the time, the wireless data terminal unit then continues to play current program if respond when not receiving the school that data service center returns in setting-up time, waits for lock in time next time.
The 5. described preferential broadcast of step finishes the back and recovers former playlist, and the multimedia information data control card is deleted original preferential multimedia messages automatically.
The 5. described preferential broadcast of step, data service center is worked out preferential multimedia messages, and then to all wireless data terminal unit starting early warning mechanisms in netting, preferential multimedia messages can broadcast in early warning starts the back setting-up time.
Described multimedia display screen 5 can be in LED display, LCD display or the plasma panel a kind of.
Compared with prior art, the invention has the beneficial effects as follows, the wireless data terminal unit is stored in multimedia information data on the playback terminal multimedia control card by data service center in advance, when network environment is unstable, can guarantee to play smooth, image quality is clear, raising information issue quality, and added the playlist online updating, realized the online dynamic renewal of multimedia messages, multimedia messages is play synchronously, processing with emergence message, not only embodied the intelligent and convenience of radio network information issue, satisfied the high request of special dimension and occasion especially to a certain extent, made multicast put terminal and can play more smooth, in time, more flexible, the information program of intelligence allows masses enjoy the enjoyment that the wireless messages world brings all the time.
Description of drawings
Fig. 1 is the schematic diagram of a kind of multi-media information distribution method based on wireless network of the present invention;
Fig. 2 is a kind of multi-media information distribution method multimedia messages issue FB(flow block) based on wireless network of the present invention;
Fig. 3 is that a kind of multi-media information distribution method multimedia information data control card based on wireless network of the present invention starts flow chart;
Fig. 4 is the clock correction schematic diagram of a kind of multi-media information distribution method based on wireless network of the present invention;
A kind of multi-media information distribution method multimedia play terminal playlist schematic diagram of Fig. 5 the present invention based on wireless network.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail.
With reference to Fig. 2~Fig. 5, implement a kind of method of issuing based on the multimedia messages of wireless network, best, described method comprises:
1., the 1 pair of multimedia information data in multimedia information data center and playlist work out, the storage after establishment is handled is to data service center 2 databases.When described multimedia information data center 1 establishment multimedia messages is tabulated, will work out playlist and multimedia messages content respectively.Playlist is the multimedia information sequence that will play the same day, is the particular content information of the multimedia messages that will play in the multimedia messages contents table.
Its attribute has three kinds during the multimedia messages content compilation: preferential multimedia messages, common multimedia information, cut-broadcasting multimedia information.
Preferential multimedia messages is about some emergency case, as earthquake, and typhoon warning, or government need in time be broadcast to some popular notice informations etc.; Common multimedia information is prior some prefabricated business informations or commonweal information etc.; Cut-broadcasting multimedia information is at some emergency informations in particular cases, such as common multimedia information content loss of data on the multimedia information data control card, just can play this type of multimedia messages content when reading to come out, multimedia messages content character is formulated by the multimedia information data center, can be the public good multimedia messages, also can be free commercial multimedia messages.
After multimedia play terminal 6 energized, multimedia information data control card 4 is started fast, and wireless data terminal unit 3 may be also in last line states at this moment.Waiting for whether the information data of inner multimedia during this period of time control card 4 detection of reaching the standard grade in wireless data terminal unit 3 earlier has preferential multimedia messages to need to play, then play preferential multimedia messages if having, if there is not then to play the common multimedia information of current broadcast area stored according to the ordinary playing tabulation, if current broadcast area is not stored any common multimedia information, plays break-in multimedia messages then, if current broadcast area is not stored any cut-broadcasting multimedia information, then multimedia display screen is that the blank screen state just normally begins to play after reaching the standard grade and downloaded up-to-date playlist and corresponding multimedia information data in the wireless data terminal unit.
2., multimedia information data is transferred to wireless data terminal unit 3,
A. reach the standard grade in wireless data terminal unit 3, and operate when carrying out once the school, and send the notice of reaching the standard grade to data service center 2 simultaneously,
B. data service center 2 carries out alternately with wireless data terminal unit 3 after detecting the notice of reaching the standard grade, and judges more new situation of playlist;
C. up-to-date playlist and corresponding multimedia information data are downloaded from data service center 2 in wireless data terminal unit 3;
D. the multimedia information data of downloading is stored in multimedia information data control card 4;
After reaching the standard grade in wireless data terminal unit 3, with time server carry out once to the time, to the time after carry out alternately with data service center 2, whether the playlist of judging multimedia information data control card 4 storage area stores is up-to-date playlist, if not, then upgrade up-to-date playlist and corresponding multimedia information file content, if then can play according to the playlist and the multimedia information file content of current storage area stores.When download to upgrade finish after, the wireless data terminal unit keeps carrying out alternately with data service center, whether detect has up-to-date multimedia messages tabulation or preferential multimedia messages to need reception.
3., wireless data terminal unit 3 play multimedia information
Described data service center 2 searches the change of play arranging because of multimedia messages when having new playlist and multimedia information file content to issue, play in order not influence current multimedia messages, multimedia information data control card 4 storage areas can be divided into current broadcast area and up-to-date multimedia messages district.
Current broadcast area is stored the multimedia messages content and the playlist of current broadcast, and the multimedia messages content and the playlist of the needs broadcast that receives, the multimedia messages content and the playlist of up-to-date download are just deposited by up-to-date multimedia messages district.The download back that finishes copies up-to-date multimedia messages content and playlist its corresponding storage area to the current broadcast area by certain algorithm from up-to-date multimedia messages district, begin up-to-date multimedia messages and play.
4., when 3. step carries out, wireless data terminal unit 3 is remaining the information interaction with data service center 2, when having new multimedia data information to issue again, keep step broadcast 3., download up-to-date playlist and corresponding multimedia messages content simultaneously.
Described in the prefabricated multimedia messages tabulation playing process of playback terminal 6 according to 4 storages of multimedia information data control card, may be owing to many reasons, such as outage, temporary fault etc. appears in playback terminal 6, it is asynchronous to make playback terminal 6 multimedia messagess that belong to same grouping play, and a timer is set, when wireless data terminal unit 3 can carry out the school at regular intervals according to timer, after during the school, playback terminal 6 is unified according to up-to-date playlist synchronous playing on the same group.
5., the preferential multimedia messages that is stored on the multimedia information data control card 4 is preferentially play according to effectual time.
When being in an emergency, as earthquake, typhoon, the accident that administration request in time broadcasts etc., the preferential multimedia messages of multimedia information data center 1 establishment, the notice terminal sends preferential multimedia messages to wireless data terminal unit 3 after reaching the standard grade and is stored on the multimedia information data control card 4, preferentially plays according to the effectual time of preferential multimedia messages.Finish the back and recover the execution of former playlist, and remove prior information automatically, wireless data terminal unit 3 also reverts to former communications status.
Wireless data terminal unit 3 can stop list controls and broadcast after receiving preferential multimedia messages, in time play preferential multimedia messages, preferential multimedia messages is with period control (if broadcasting m minute), recovering normal list controls after to be played the finishing broadcasts, and preferential multimedia messages does not keep in multimedia information data control card 4 memory blocks, i.e. the preferential multimedia information file content of deletion in the memory block.
The data service center 2 of step described in 2. carries out alternately with wireless data terminal unit 3, judge more new situation of playlist, if the playlist of multimedia information data control card 4 storages is not a up-to-date playlist in data service center 2 databases, then up-to-date playlist and corresponding multimedia information data are downloaded from data service center 2 in wireless data terminal unit 3.
Described multimedia play terminal 6 comprises wireless data terminal unit 3, multimedia information data control card 4 and multimedia display screen 5.Wireless data terminal unit 3 is responsible for accepting and sending multimedia information data, carries out alternately with data service center 2 and multimedia information data storage card 4.Multimedia information data control card 4 is responsible for the multimedia information data that receives is stored, and controls multimedia display screen 5 by the embedded Control software of operation on it and play.
Whether data service center 2 search need issue because of the change of playing arrangement has new multimedia messages tabulation, can not influence the normal play of current program when new multimedia messages issues.Timer is set simultaneously, when playback terminal 6 can carry out the school with time server at regular intervals, during the school after no matter the current program processes of playing separately of playback terminal 6 on the same group how, are unifiedly carried out synchronous playing according to the arrangement of playlist.
When the 4. described wireless data terminal of step unit 3 can carry out the school at regular intervals according to timer, when sending the school, wireless data terminal unit 3 asks, and the record current time,
A. if respond when in setting-up time, receiving the school that data service center 2 returns, correcting local time then, arrive clock check at interval the time, divide the identical program of synchronous playing according to the time of playlist;
B. if respond when in setting-up time, not receiving the school that data service center 2 returns, then continue to play current program, wait for lock in time next time.
Through one subsynchronous after, thereby timer can receive the acknowledgement information sent the wireless data terminal unit and upgrade regularly tabulation, be set lock in time next time.
The 5. described preferential broadcast of step finishes the back and recovers former playlist, and multimedia information data control card 4 is deleted original preferential multimedia messages automatically.
The 5. described preferential broadcast of step, the preferential multimedia messages of data service center 2 establishments starts early warning mechanism to all wireless data terminal unit 3 in netting then, and preferential multimedia messages can broadcast in early warning starts the back setting-up time.
Create multimedia messages table of contents and playlist area in multimedia information data control card 4 memory blocks, the multimedia messages contents table is deposited multimedia messages index and multimedia messages content; Playlist is divided into preferential playlist and ordinary playing tabulation, what preferential playlist was deposited is the multimedia messages index and the effectual time of preferential multimedia messages, and what the ordinary playing tabulation was deposited is multimedia messages index, effectual time and the validity date of prefabricated multimedia messages.The ordinary playing tabulation was arranged according to the period, the multimedia messages that each period will play is predetermined, each multimedia messages is all set fixing reproduction time, if be set at 15 seconds, if play next multimedia messages when being played to 14 seconds and then stopping to play after waiting for 1 second when the reproduction time of a multimedia messages is 14 seconds, as if the reproduction time of a multimedia messages be 16 seconds then when being played to 15 seconds the multimedia information data control card stop to play this multimedia messages automatically and play next multimedia messages according to the arrangement of playlist.
The playlist information that data service center is sent in the wireless data terminal unit is stored in the playlist area of multimedia information data control card 4, and the multimedia information file content information is stored in the multimedia messages table of contents.If receiving, the wireless data terminal unit judges that ordinary playing table data information then is stored on the multimedia information data control card in the ordinary playing tabulation after the information, if preferential playlist data information then is stored on the multimedia information data control card in the preferential playlist.Simultaneously, corresponding multimedia information file content stores its corresponding region in the multimedia messages contents table, cut-broadcasting multimedia information is changeless in a very long time generally speaking.
With reference to Fig. 2~Fig. 5, implement a kind of method of issuing based on the multimedia messages of wireless network, other method is:
The data terminal unit that described multimedia play terminal 6 adopts based on the LED information issuing method, and described multimedia display screen 5 is set to medium LED display screen.
The good playlist of multimedia information data center layout in advance, and encode by 2 pairs of corresponding multimedia messages contents of data service center, be sent to central database behind the coding.The multimedia play terminal 6 that comprises wireless data terminal unit 3 and medium LED display screen at first excites wireless data terminal unit 3, make it utilize the DTU technology to reach the standard grade based on wireless network, from when before data service center 2 sends the notice of reaching the standard grade, doing once the school earlier, operating, send the notice of reaching the standard grade to data service center 2 more subsequently, data service center 2 detects reaching the standard grade of wireless data terminal unit 3 and notifies the back information data of carrying out with it mutual, whether the playlist of judging current storage on the multimedia information data control card 4 on the multimedia play terminal 6 is the up-to-date playlist of layout in the central database, if not up-to-date playlist, data service center 2 will send up-to-date multimedia messages listing file to the wireless data terminal unit 3 of multimedia play terminal 6 based on wireless network, after wireless data terminal unit 3 downloads to multimedia information data center 1 programmed up-to-date playlist and multimedia file content from data service center 2, be stored on the multimedia information data control card 4, receive the back and play again by medium LED display screen 5; If the playlist of current storage is up-to-date playlist on the multimedia information data control card 4, the multimedia messages that then begins to play-over by medium LED display screen 5 current storage.
In the process of multimedia messages normal play, wireless data terminal unit 3 and data service center 2 are based on the wireless network real-time, interactive, whether data service center 2 search have new multimedia messages playlist issue, if have, under the situation that does not influence multimedia play terminal 6 normal play, send to wireless data terminal unit 3.
Simultaneously, as shown in Figure 5, multimedia play terminal 6 is provided with timer, in the time of can carrying out once the school with time server at regular intervals, after during the school no matter the current multimedia messages progress of playing separately of on the same group playback terminal how, is unifiedly carried out synchronous playing according to the arrangement of up-to-date playlist.
And in other execution mode, what described multimedia display screen (5) can be in LED display, LCD display, the plasma panel is a kind of.Adopt the advantage of such display to be that the power consumption of display is low, do not glimmer, zero radiation is fit on the product of needs display unit long-term work.The more important thing is, the outward appearance of LED display, LCD display or plasma panel is slim light and handy, particularly at some such as taxi, in the limited like this usage space such as bus or elevator, use LED display, LCD display or plasma panel when saving the space, also the design and installation display screen to be provided great convenience.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.

Claims (6)

1. the multi-media information distribution method based on wireless network is characterized in that, described method comprises:
1., multimedia information data center (1) work out multimedia information data and playlist, the storage after establishment is handled is to data service center (2) database;
2., multimedia information data is transferred to wireless data terminal unit (3),
A. reach the standard grade wireless data terminal unit (3), operates when carrying out once the school, and send the notice of reaching the standard grade to data service center (2) simultaneously;
B. data service center (2) carries out alternately with wireless data terminal unit (3) after detecting the notice of reaching the standard grade, and judges more new situation of playlist;
C. wireless data terminal unit (3) download up-to-date playlist and corresponding multimedia information data from data service center (2);
D. the multimedia information data of downloading is stored in multimedia information data control card (4);
3., multimedia information data control card (4) is by embedded management software control multimedia display screen (5) the play multimedia information on it;
4., when 3. step carries out, wireless data terminal unit (3) is remaining the information interaction with data service center (2), when up-to-date multimedia data information issues, keep step and 3. download up-to-date playlist and corresponding multimedia data information normal play the time, and a timer is set, when wireless data terminal unit (3) can carry out the school at regular intervals according to timer, after during the school, multimedia play terminal (6) unification is according to the arrangement synchronous playing of up-to-date playlist on the same group;
5., the preferential multimedia messages that is stored on the multimedia information data control card (4) preferentially plays according to effectual time,
Described multimedia play terminal (6) comprises wireless data terminal unit (3), multimedia information data control card (4) and multimedia display screen (5), multimedia information data is responsible for receiving and sending in wireless data terminal unit (3), carry out alternately with data service center (2) and multimedia information data control card (4), the multimedia information data control card is responsible for the multimedia information data that receives is stored, and controls multimedia display screen by the embedded Control software of operation on it and play.
2. a kind of multi-media information distribution method according to claim 1 based on wireless network, it is characterized in that: the data service center (2) of step described in 2. carries out alternately with wireless data terminal unit (3), judge more new situation of playlist, if the playlist of multimedia information data control card (4) storage is not a up-to-date playlist in data service center (2) database, then wireless data terminal unit (3) download up-to-date playlist and corresponding multimedia information data from data service center (2).
3. a kind of multi-media information distribution method according to claim 1 based on wireless network, the 4. described wireless data terminal of step unit (3) it is characterized in that: when can carry out the school at regular intervals according to timer, when sending the school, wireless data terminal unit (3) asks, and the record current time
A. arrive clock check at interval the time, wireless data terminal unit (3) if respond when receiving the school that data service center (2) returns in setting-up time, and correcting local time then is according to the identical program of the dividing time-steps synchronous playing of playlist;
B. arrive clock check at interval the time, wireless data terminal unit (3) then continue to play current program if respond when not receiving the school that data service center (2) returns in setting-up time, wait for lock in time next time.
4. a kind of multi-media information distribution method according to claim 1 based on wireless network, it is characterized in that: the 5. described preferential broadcast of step, finish the back and recover former playlist, and multimedia information data control card (4) is deleted original preferential multimedia messages automatically.
5. a kind of multi-media information distribution method according to claim 1 based on wireless network, it is characterized in that: the 5. described preferential broadcast of step, data service center (2) is worked out preferential multimedia messages, then all wireless data terminal unit (3) in netting are started early warning mechanism, preferential multimedia messages can broadcast in early warning starts the back setting-up time.
6. a kind of multi-media information distribution method based on wireless network according to claim 1 is characterized in that: described multimedia display screen (5) is a kind of in LED display, LCD display, the plasma panel.
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