CN102547423A - Vehicle-mounted device with mobile television and implementation method thereof - Google Patents
Vehicle-mounted device with mobile television and implementation method thereof Download PDFInfo
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- CN102547423A CN102547423A CN2011104469005A CN201110446900A CN102547423A CN 102547423 A CN102547423 A CN 102547423A CN 2011104469005 A CN2011104469005 A CN 2011104469005A CN 201110446900 A CN201110446900 A CN 201110446900A CN 102547423 A CN102547423 A CN 102547423A
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Abstract
The invention relates to a vehicle-mounted device with a mobile television and an implementation method thereof, wherein the vehicle-mounted device comprises a signal-receiving chip and a central processing chip, the signal-receiving chip is used for receiving CMMB (China Mobile Multimedia Broadcasting) signals and demodulating the received CMMB signals, the central processing chip is connected with the signal-receiving chip, and comprises a conversion unit and a transmission unit, the conversion unit converts the demodulated CMMB signals into audio signals and video signals according to the instruction of a user, and the transmission unit transmits the audio signals and the video signals to a host. The implementation method includes the following steps: receiving CMMB signals and demodulating the received CMMB signals; according to the instruction of the user, converting the demodulated CMMB signals into audio signals and video signals; and transmitting the audio signals and the video signals to the host. The invention ensures that clear CMMB television programs can be watched as a vehicle moves, and is highly convenient, real-time and flexible.
Description
Technical field
The present invention relates to the mobile unit technical field, particularly relate to mobile unit and its implementation of a kind of Tape movement TV.
Background technology
Along with the development of domestic automobile, the increase of automobile function, press for the business that provides abundant more.Because the birth of car-mounted terminal; Make the in-car TV business have more influence power and market potential than common TV; In-car TV also will become following emerging communications media, and the new channel that becomes TV broadcast, both can make full use of content resource; Also enlarge user scope, and can realize the mobile of radio network.Because car-mounted terminal both can playing audio-video, again can videotex information; Both can real-time play, again certain memory function can be arranged, and possess mutual function, therefore, the characteristic of all medium up to now that it is integrated is so need mobile unit and its implementation of a kind of novel Tape movement TV badly.
Summary of the invention
Technical problem to be solved by this invention provides mobile unit and its implementation of a kind of Tape movement TV, can be implemented under the mobile status of automobile and watches CMMB TV programme clearly.
The technical solution adopted for the present invention to solve the technical problems is: the mobile unit that a kind of Tape movement TV is provided; Comprise and be used to receive Chinese Multimedia Mobile broadcasting (China Mobile Multimedia Broadcasting is hereinafter to be referred as " CMMB ") signal and the signal receiving chip of the CMMB signal demodulation of receiving, the central processing element that links to each other with signal receiving chip; Said central processing element comprise according to the CMMB conversion of signals of user instruction after with demodulation be audio signal and vision signal converting unit be used for said audio signal and the transmission unit of video signal transmission to main frame.
Said central processing element also comprises sequencing unit, be used for the programme of the CMMB signal after the demodulation is sorted, and the programme of the CMMB signal after will sorting tabulation is transferred to said main frame.
Said central processing element also comprises judging unit; Be used to judge whether the CMMB signal after the demodulation exists urgent broadcast CMMB signal; If exist then notify converting unit that this urgent broadcast CMMB signal is carried out conversion of signals, and the vision signal after will changing through transmission unit and audio signal transmission are to main frame.
Link to each other with the control asynchronous serial communication interface through the data asynchronous serial communication interface between said signal receiving chip and the central processing element.
The mobile unit of said Tape movement TV also comprises condition receiving system, and said condition receiving system links to each other with central processing element.
The mobile unit of said Tape movement TV also comprises serial flash, and said serial flash links to each other with central processing element.
Said signal receiving chip adopts the base band radio frequency chip.
Said central processing element realizes that through asynchronous serial communication interface and Serial Peripheral Interface (SPI) and main frame communication is connected.
Said central processing element arrives main frame through composite video broadcast singal interface with video signal transmission.
Said central processing element arrives main frame through the dual-channel audio analog signal with audio signal transmission.
The technical solution adopted for the present invention to solve the technical problems is: a kind of implementation method of mobile unit of Tape movement TV also is provided, may further comprise the steps:
(1) receives CMMB signal and with the CMMB signal demodulation of receiving;
(2) be audio signal and vision signal according to the CMMB conversion of signals of user instruction after with demodulation;
(3) give main frame with said audio signal and video signal transmission.
Comprise also between said step (1) and (2) that the programme with the CMMB signal after the demodulation sorts, and the programme of the CMMB signal after will sorting tabulation is transferred to the step of main frame.
Comprise also between said step (1) and the step (2) whether the CMMB signal of judging after the demodulation exists urgent broadcast CMMB signal; If exist then be vision signal and audio signal with this urgent broadcast CMMB conversion of signals, and the vision signal after will change and audio signal transmission are to main frame.
Beneficial effect
Owing to adopted above-mentioned technical scheme; The present invention compared with prior art; Have following advantage and good effect: the present invention can be implemented under the mobile status of automobile and watches CMMB TV programme clearly, has good convenience, real-time and flexibility, and the signal that receives is a digital signal; There is not noise jamming, thereby guaranteed the quality that TV programme are play.
Description of drawings
Fig. 1 is the block diagram of the mobile unit of Tape movement TV of the present invention;
Fig. 2 is the block diagram of first execution mode of the mobile unit of Tape movement TV of the present invention;
Fig. 3 is the block diagram of second execution mode of the mobile unit of Tape movement TV of the present invention;
Fig. 4 is the flow chart of first execution mode of implementation method of the mobile unit of Tape movement TV of the present invention;
Fig. 5 is the flow chart of second execution mode of implementation method of the mobile unit of Tape movement TV of the present invention.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in the restriction scope of the present invention.Should be understood that in addition those skilled in the art can do various changes or modification to the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
The present invention relates to a kind of mobile unit of Tape movement TV, as shown in Figure 1, comprise signal receiving chip 100, central processing element 200, main frame 300, condition receiving system 400, serial flash 500, power supply 600.Said signal receiving chip 100 all links to each other with power supply with central processing element 200, and said signal receiving chip 100 is used to receive the CMMB signal and with the CMMB signal demodulation of receiving; Said central processing element 200 links to each other with said signal receiving chip 100, is used for the CMMB conversion of signals after the demodulation is audio signal and vision signal and will be transferred to main frame 300.Said condition receiving system 400 links to each other with central processing element 200, is used for leading subscriber and Management Television program; Said serial flash 500 links to each other with central processing element 200, is used to carry out information stores and renewal.
The present invention can be implemented under the mobile status of automobile and watches CMMB TV programme clearly, has good convenience, real-time and flexibility, and the signal that receives is digital signal, does not have noise jamming, thereby has guaranteed the quality that TV programme are play.Said signal receiving chip 100 adopts the base band radio frequency chip, utilizes the base band radio frequency chip can realize frequency hopping, thereby obtains confidentiality and antijamming capability preferably.
Wherein, said signal receiving chip 100 links to each other with central processing element 200 through Serial Peripheral Interface (SPI); Also be connected with interrupt request line between said signal receiving chip 100 and the central processing element 200.Utilize Serial Peripheral Interface (SPI) that central processing element 200 and various ancillary equipment are communicated with exchange message with serial mode.The periphery is provided with flash memory, network controller, LCD display driver and A/D converter or the like.Adopt Serial Peripheral Interface (SPI) to transmit different with common serial communication; Common serial communication one-time continuous transmits at least 8 bit data; And Serial Peripheral Interface (SPI) allows the transmission of one one of data, even allows to suspend, because its clock line is controlled by main control device; When not having the clock saltus step, data are not gathered or transmitted to slave unit.That is to say that main equipment can be accomplished the control to communication through the control to clock line.In point-to-point communication, Serial Peripheral Interface (SPI) need not carry out addressing operation, and is full-duplex communication, seems simple efficient.
Said central processing element 200 realizes that with Serial Peripheral Interface (SPI) and main frame 300 communication is connected through asynchronous serial communication interface.Asynchronous serial communication interface can convert the outside next serial data of computer into byte, supplies computer-internal to use the device of parallel data to use.In the serial data stream of output, add parity check bit, and the data flow that receives from the outside is carried out parity check.In output stream, add the start and stop mark, and from receiving data stream deletion start and stop mark, also can handle the interrupt signal (keyboard and mouse also are serial devices) sent by keyboard or mouse and the management by synchronization problem of process computer and external series equipment.
Said central processing element 200 arrives main frame 300 through composite video broadcast singal interface with video signal transmission.Composite video broadcast singal interface is the conventional image data transmission method of (U.S.) NTSC (NTSC) TV signal, and it transmits data with analog waveform.Composite video comprises aberration (color harmony saturation) and brightness (light) information, and with them synchronously in blanking pulse, with same signal transmission.Said central processing element arrives main frame through the dual-channel audio analog signal with audio signal transmission.Dual track realizes stereosonic principle exactly, places two loud speakers that are mutually certain angle in the space, and each loud speaker provides signal by a sound channel separately.And the signal of each sound channel has just passed through processing when recording: (people is ears to the Biological Principles of principle imitation people's ear when nature is heard sound of processing; Can judge the particular location of sound source when hearing sound according to left ear and auris dextra to the acoustic phase potential difference); Show on the circuit basically just two sound channel signals difference to some extent on phase place, like this when just experiencing stereosonic effect during listening on the axial line joining of two loud speakers of standing.
Said mobile unit also comprises condition receiving system 400, and said condition receiving system 400 links to each other with central processing element 200.The composition of condition receiving system 400 includes: Subscriber Management System SMS, business information generation system SIG, program PMS/SI editing system, program scheduling are handled EIS, the SAS of user authorization management system, condition reception CA etc.Mainly contain two major parts: one is the SMS of leading subscriber, and one is the CA of managing programm.CA mainly is divided into the two large divisions: the one, and the signal scrambling part, it is to control the scrambling of scrambler to signal through a random code that random code generator produced (being called control word CW); The 2nd, encryption section, the signal that make scrambling is at receiving terminal descrambling successfully, and receiving terminal also must have with the living control word of scrambling end controls descrambler; So, the CW of front end is sent to receiving terminal, if directly transmission can be easy to by hacker's intercepting and capturing and make CAS ineffective; For this reason; Encrypt transmission to CW, this encryption is a kind of multi-layer security mechanism, thereby increases the fail safe that CW transmits; The ciphertext that ground floor produced of directly CW being encrypted is called Entitlement Control Message ECM; Transmit through the code stream of multiplexer with scrambling, information such as ECM also contains if having time, program price, program authorization control, so ECM is the management information towards program.The CW encrypted secret key is called working key SK, and SK is a month key usually again, changes once in every month, whenever changes SK one time, and system all will authorize all users again.It is with being called program key PDK SK to be encrypted that the second layer is encrypted; Ciphertext that is produced and the authorization message composition Entitlement Management Message EMM that generates through SAS from the authorized order that SMS obtains, EMM also contains authorized user messages such as intelligent card numbers, mandate time, authorization mechanism.If these information spinners are accomplished the mandate to the user; Therefore EMM is user oriented management information; When EMM sees, sees that to the user what channel authorizes, and it also transmits with the scrambling code stream through multiplexer, more than these have formed the most basic encryption system of CA.
Said mobile unit also comprises serial flash 500, and said serial flash 500 links to each other with central processing element 200.Serial flash 500 renewal speed are fast (10-30 is between second) very, and it is high to upgrade flexibility, because only need bare board (being convenient to exploitation, manufacturing, memory block renewal or maintenance) just can realize.
The present invention can be implemented under the mobile status of automobile and watches CMMB TV programme clearly, has good convenience, real-time and flexibility, and the signal that receives is digital signal, does not have noise jamming, thereby has guaranteed the quality that TV programme are play.
First execution mode of the mobile unit of Tape movement TV of the present invention, as shown in Figure 2, comprise signal receiving chip 100, be used to receive the CMMB signal and with the CMMB signal demodulation of receiving.This signal receiving chip 100 links to each other with the control asynchronous serial communication interface through the data asynchronous serial communication interface with central processing element 200; The two-way asynchronous serial communication interface is divided into control asynchronous serial communication interface and data asynchronous serial communication interface; Use data asynchronous serial communication interface independently to be used for the message transmission of big data quantity, prevent that public asynchronous serial communication interface from causing that control command stops up.The communicate configuration of wherein controlling asynchronous serial communication interface is: traffic rate is 115200bps, 1bit position of rest, no parity position.Central processing element comprises converting unit 220 and transmission unit 230; Said converting unit 220 is audio signal and vision signal according to the CMMB conversion of signals of user instruction after with demodulation; H.264 (a kind of digital video coding-coding device standard of high compression) decoding that CMMB signal after the demodulation soon carries out vision signal obtains vision signal, and the decoding of carrying out audio signal simultaneously obtains audio signal.Said transmission unit 230 is used for giving main frame 300 with said audio signal and video signal transmission; Audio signal is transferred to main frame through the audio analog signals interface during transmission, and vision signal is transferred to main frame 300 through composite video broadcast singal (Composite Video Broadcast Signal is called for short " CVBS ") interface.Said central processing element also comprises sequencing unit 210, be used for the programme of the CMMB signal after the demodulation is sorted, and the programme of the CMMB signal after will sorting tabulation is transferred to said main frame 300; That is to say; Sequencing unit 210 is according to Business Name, reproduction time, TV guide, and information such as content outline sort, and the programme of the CMMB signal after will sorting tabulation is transferred to main frame 300; Make the guide information that can show current business on the display screen of main frame 300; Content displayed is as shown in table 1 on the display screen, and table 1 sorts according to reproduction time, and TV guide part wherein can be the video selections.
| Business Name | Reproduction time | TV guide | The content outline |
| First finance and economics | 8:00-9:00 | ...... | By * * the current stock market of analysis is dynamic |
| Walk close to science | 8:30-9:30 | ...... | The prevention of hand-foot-and-mouth disease |
| The rumor terminator | 9:30-11:00 | ...... | Can sound only according to the mankind shatter glass? |
Table 1
This shows; The present invention can be implemented under the mobile status of automobile and watches CMMB TV programme clearly, has good convenience, real-time and flexibility, and the signal that receives is a digital signal; There is not noise jamming, thereby guaranteed the quality that TV programme are play.Also the corresponding programme of CMMB signal is transferred to main frame through the mode of tabulating, makes the user to know the program inventory of playing or being about to play, thereby make the user watch TV to have more targeted through the display screen on the main frame through sequencing unit.
Second execution mode of the mobile unit of Tape movement TV of the present invention; Roughly the same with first execution mode, its difference is, and is as shown in Figure 3; Central processing element described in this execution mode also comprises judging unit 240; Be used to judge whether the CMMB signal after the demodulation exists urgent broadcast CMMB signal, if exist then notify 220 pairs of these urgent broadcasts of converting unit CMMB signal to carry out conversion of signals, and the vision signal after will changing through transmission unit 230 and audio signal transmission are to main frame.That is to say; When including urgent broadcast CMMB signal in the CMMB signal after the demodulation; It is audio signal and vision signal with this conversion of signals also that converting unit can be found out this urgent broadcast CMMB signal automatically according to the indication of judging unit; The H.264 decoding that urgent broadcast CMMB signal after the demodulation soon carries out vision signal obtains vision signal; The decoding of carrying out audio signal simultaneously obtains audio signal, again the vision signal that obtains is transferred to main frame 300 through composite video broadcast singal interface, and audio signal is transferred to main frame 300 through the audio analog signals interface.So the user can learn immediately where emergency has taken place, thereby avoids some unnecessary troubles.Wherein, whether this service-user can be provided with open-minded voluntarily, and wherein the urgent broadcast signal also is not limited to some catastrophic incidents, also can comprise information such as stock information, communication navigation, weather forecast.
First execution mode of the implementation method of the mobile unit of a kind of Tape movement TV of the present invention, as shown in Figure 4, may further comprise the steps:
In the step 410, receive the CMMB signal and with the CMMB signal demodulation of receiving.That is to say that vehicle-mounted end is searched for current available business, comprises TV and broadcasting, search the CMMB signal that the back receives available service, and the CMMB signal of receiving is carried out demodulation.
Then get into step 420, the programme of the CMMB signal after the demodulation sorts, and the programme of the CMMB signal after will sorting tabulation is transferred to main frame.Specifically, after to the demodulation of CMMB signal, can be according to Business Name, reproduction time, TV guide; Corresponding programme sorts information such as content outline to the CMMB signal; And the programme of the CMMB signal after will sorting tabulation is transferred to main frame, makes the guide information that can show current business on the display screen of main frame, and content displayed is as shown in table 2 on the display screen; Table 2 is that the initial according to Business Name sorts, and TV guide part wherein can be the video selections.
| Business Name | Reproduction time | TV guide | The content outline |
| First finance and economics | 8:00-9:00 | ...... | By * * the current stock market of analysis is dynamic |
| The rumor terminator | 9:30-11:00 | ...... | Can sound only according to the mankind shatter glass? |
| Walk close to science | 8:30-9:30 | ...... | The prevention of hand-foot-and-mouth disease |
Table 2
In step 430, be audio signal and vision signal according to the CMMB conversion of signals of user instruction after with demodulation.Specifically; The user is according to the programme tabulation that shows on its host display; Select it to want the program of seeing; Mobile unit is audio signal and vision signal according to user's the instruction CMMB conversion of signals after with demodulation then, is about to the H.264 decoding that CMMB signal after the demodulation carries out vision signal and obtains vision signal, and the decoding of carrying out audio signal simultaneously obtains audio signal.
At last, get into step 440, give main frame with audio signal and video signal transmission, audio signal is transferred to main frame through the audio analog signals interface during transmission, and vision signal is transferred to main frame through composite video broadcast singal interface.
Second execution mode of the implementation method of the mobile unit of a kind of Tape movement TV of the present invention, as shown in Figure 5, may further comprise the steps:
In the step 510, receive the CMMB signal and with the CMMB signal demodulation of receiving.That is to say that vehicle-mounted end is searched for current available business, comprises TV and broadcasting, search the CMMB signal that the back receives available service, and the CMMB signal of receiving is carried out demodulation.
Then, get into step 520, judge whether the CMMB signal after the demodulation exists urgent broadcast CMMB signal, if having urgent broadcast CMMB signal then get into step 550, otherwise entering step 530.
In step 550, urgent broadcast CMMB conversion of signals is audio signal and vision signal and is transferred to main frame.That is to say; When including urgent broadcast CMMB signal in the CMMB signal after the demodulation; Automatically be audio signal and vision signal with this urgent broadcast CMMB conversion of signals, the H.264 decoding that the urgent broadcast CMMB signal after the demodulation soon carries out vision signal obtains vision signal, and the decoding of carrying out audio signal simultaneously obtains audio signal; Again the vision signal that obtains is transferred to main frame through composite video broadcast singal interface, audio signal is transferred to main frame through the audio analog signals interface.So the user can learn immediately where emergency has taken place, thereby avoids some unnecessary troubles.Wherein, whether this service-user can be provided with open-minded voluntarily, and wherein the urgent broadcast signal also is not limited to some catastrophic incidents, also can comprise information such as stock information, communication navigation, weather forecast.
In step 530, be audio signal and vision signal according to the CMMB conversion of signals of user instruction after with demodulation.That is to say; When not having urgent broadcast CMMB signal in the CMMB signal after the demodulation; Then the instruction according to the user is audio signal and vision signal with corresponding C MMB conversion of signals; The H.264 decoding that CMMB signal after the demodulation soon carries out vision signal obtains vision signal, and the decoding of carrying out audio signal simultaneously obtains audio signal.
At last, in step 540, give main frame with audio signal and video signal transmission, audio signal is transferred to main frame through the audio analog signals interface during transmission, and vision signal is transferred to main frame through composite video broadcast singal interface.
Need to prove; Whether the CMMB signal after the demodulation of judging in this execution mode exists urgent broadcast CMMB signal; If exist then be vision signal and audio signal with this urgent broadcast CMMB conversion of signals; And the vision signal after will changing and audio signal transmission give first execution mode of the implementation method of the mobile unit that the step of main frame also is applicable to the Tape movement TV, promptly between the step 410 of first execution mode and step 430, inserts the step of above-mentioned judgement.
Be not difficult to find; The present invention can be implemented under the mobile status of automobile and watches CMMB TV programme clearly, has good convenience, real-time and flexibility, and the signal that receives is a digital signal; There is not noise jamming, thereby guaranteed the quality that TV programme are play.Also the corresponding programme of CMMB signal is transferred to main frame through the mode of tabulating, makes the user to know the program inventory of playing or being about to play, thereby make the user watch TV to have more targeted through the display screen on the main frame through sequencing unit.
Claims (13)
1. the mobile unit of a Tape movement TV is characterized in that, comprises being used to receive the CMMB signal and with the signal receiving chip of the CMMB signal demodulation of receiving, the central processing element that links to each other with signal receiving chip; Said central processing element comprises that according to the CMMB conversion of signals of user instruction after with demodulation be the converting unit of audio signal and vision signal and the transmission unit of said audio signal and video signal transmission being given main frame.
2. the mobile unit of Tape movement TV according to claim 1; It is characterized in that; Said central processing element also comprises sequencing unit, be used for the programme of the CMMB signal after the demodulation is sorted, and the programme of the CMMB signal after will sorting tabulation is transferred to said main frame.
3. the mobile unit of Tape movement TV according to claim 1; It is characterized in that; Said central processing element also comprises judging unit; Be used to judge whether the CMMB signal after the demodulation exists urgent broadcast CMMB signal, if exist then notify converting unit that this urgent broadcast CMMB signal is carried out conversion of signals, and the vision signal after will changing through transmission unit and audio signal transmission are to main frame.
4. the mobile unit of Tape movement TV according to claim 1 is characterized in that, links to each other with the control asynchronous serial communication interface through the data asynchronous serial communication interface between said signal receiving chip and the central processing element.
5. the mobile unit of Tape movement TV according to claim 1 is characterized in that, also comprises condition receiving system, and said condition receiving system links to each other with central processing element.
6. the mobile unit of Tape movement TV according to claim 1 is characterized in that, also comprises serial flash, and said serial flash links to each other with central processing element.
7. the mobile unit of Tape movement TV according to claim 1 is characterized in that, said signal receiving chip adopts the base band radio frequency chip.
8. the mobile unit of Tape movement TV according to claim 1 is characterized in that, said central processing element realizes that through asynchronous serial communication interface and Serial Peripheral Interface (SPI) and main frame communication is connected.
9. the mobile unit of Tape movement TV according to claim 1 is characterized in that, said central processing element arrives main frame through composite video broadcast singal interface with video signal transmission.
10. the mobile unit of Tape movement TV according to claim 1 is characterized in that, said central processing element arrives main frame through the dual-channel audio analog signal with audio signal transmission.
11. the implementation method of the mobile unit of a Tape movement TV is characterized in that, may further comprise the steps:
(1) receives CMMB signal and with the CMMB signal demodulation of receiving;
(2) be audio signal and vision signal according to the CMMB conversion of signals of user instruction after with demodulation;
(3) give main frame with said audio signal and video signal transmission.
12. the implementation method of the mobile unit of Tape movement TV according to claim 11; It is characterized in that; Comprise also between said step (1) and (2) that the programme with the CMMB signal after the demodulation sorts, and the programme of the CMMB signal after will sorting tabulation is transferred to the step of main frame.
13. the implementation method of the mobile unit of Tape movement TV according to claim 11; It is characterized in that; Comprise also between said step (1) and the step (2) whether the CMMB signal of judging after the demodulation exists urgent broadcast CMMB signal; If exist then be vision signal and audio signal with this urgent broadcast CMMB conversion of signals, and the vision signal after will change and audio signal transmission are to main frame.
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Application publication date: 20120704 |
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