CN105791955A - Vehicle-mounted terminal video playing equipment - Google Patents
Vehicle-mounted terminal video playing equipment Download PDFInfo
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- CN105791955A CN105791955A CN201410812185.6A CN201410812185A CN105791955A CN 105791955 A CN105791955 A CN 105791955A CN 201410812185 A CN201410812185 A CN 201410812185A CN 105791955 A CN105791955 A CN 105791955A
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Abstract
The invention discloses vehicle-mounted terminal video playing equipment. The vehicle-mounted terminal video playing equipment comprises a signal receiving chip and a central processing chip, wherein the signal receiving chip is used for receiving a CMMB (China Mobile Multimedia Broadcasting) signal and demodulating the received CMMB signal; the central processing chip is connected with the signal receiving chip; the signal receiving chip comprises a frequency conversion module for receiving a radio-frequency signal and a channel selection signal and converting the radio-frequency signal into an intermediate-frequency signal through down conversion, and an adjusting module for performing analog-to-digital conversion processing and demodulation processing on the intermediate-frequency signal; and the central processing chip comprises a conversion unit for converting the demodulated CMMB signal into an audio signal and a video signal according to a user command, and a transmission unit for transmitting the audio signal and the video signal to a host. The vehicle-mounted terminal video playing equipment is more convenient to use.
Description
Technical field
The present invention relates to vehicle-mounted information service field, particularly relate to a kind of car-mounted terminal video playback apparatus.
Background technology
Along with development, the increase of automobile function of domestic automobile, in the urgent need to providing the business more enriched.Birth due to car-mounted terminal, make in-car TV business than common TV more power of influence and market potential, in-car TV also will become following emerging communications media, and become the new channel of TV broadcast, both content resource can have been made full use of, have also been enlarged user scope, and be capable of the mobile of radio network.
But video has multiple format, different car-mounted terminal manufacturers uses different video formats or Video coding, cause every kind of car-mounted terminal can only play specific video format, so the video format that user oneself not support car-mounted terminal is converted into the video format that equipment is supported, watch again, bring inconvenience to user.
Summary of the invention
It is an object of the invention to propose a kind of car-mounted terminal video playback apparatus, it is not necessary to user oneself convert video formats, it is possible to play the video of different-format at car-mounted terminal.
For reaching this purpose, the present invention by the following technical solutions:
A kind of car-mounted terminal video playback apparatus workflow, comprises the following steps:
A, video is cut into video segment；
B, video segment is become original video and voice data according to original Video coding with sound code parsing；
C, original video and voice data are packaged according to the video format of car-mounted terminal support；
D, by packaged video according to the video playback standard output of car-mounted terminal to the player of car-mounted terminal, play out.
In step A, video is local video file, or video flowing.
Video segment is TS fragment file.
A kind of car-mounted terminal video playback apparatus, the car-mounted terminal of a kind of Tape movement TV is provided, including for receiving China's Multimedia Mobile broadcast (China Mobile Multimedia Broadcasting, hereinafter referred to as " CMMB ") signal the signal receiving chip demodulated by the CMMB signal received, the central processing element that is connected with signal receiving chip；Described signal receiving chip includes receiving radiofrequency signal and channel selecting signal and radiofrequency signal being down-converted to the frequency-variable module of intermediate-freuqncy signal and described intermediate-freuqncy signal carries out the adjustment module of analog-to-digital conversion process and demodulation process；Described central processing element includes according to user instruction, the CMMB signal after demodulation being converted to audio signal and the converting unit of video signal and being used for described audio signal and video signal transmission to the transmission unit of main frame.
Described signal receiving chip, the central processing element being connected with signal receiving chip are integrated in single integrated circuit.
Described central processing element also includes sequencing unit, for being ranked up by the programme of the CMMB signal after demodulation, and the programme list of the CMMB signal after sequence is transferred to described main frame.
Described central processing element also includes judging unit, for judging whether the CMMB signal after demodulation exists urgent broadcast CMMB signal, if there is then notifying that converting unit carries out signal conversion to this urgent broadcast CMMB signal, and pass through the video signal after transmission unit will be changed and audio signal transmission to main frame.
It is connected with controlling asynchronous serial communication interface by data asynchronous serial communication interface between described signal receiving chip and central processing element.
The car-mounted terminal of described Tape movement TV also includes that condition receiving system, described condition receiving system are connected with central processing element.
The car-mounted terminal of described Tape movement TV also includes that serial flash, described serial flash are connected with central processing element.
Described signal receiving chip uses baseband radio chip.
Described central processing element realizes communication connection by asynchronous serial communication interface and Serial Peripheral Interface (SPI) with main frame.
Described central processing element passes through Composite Video Baseband Signal interface by video signal transmission to main frame.
Described central processing element passes through dual-channel audio analogue signal by audio signal transmission to main frame.
Detailed description of the invention
Technical scheme is further illustrated below.
This car-mounted terminal is play video equipment workflow and is comprised the following steps:
Step 201, video cutter unit receive local video file or video flowing, and video cuts into video segment, and video segment is i.e. TS fragment file.
Step 202, video segment is become original video and voice data according to original Video coding with sound code parsing.
Step 203, original video and voice data are packaged according to the video format of car-mounted terminal support.
Step 204, by packaged video according to the video playback standard output of car-mounted terminal to the player of car-mounted terminal, play out.
Video display arts cross-platform on car-mounted terminal can allow the user need not oneself convert video formats again, directly can play different-format video at car-mounted terminal, user, without carrying out the conversion of extra video format or Video coding again, allows user's more convenient viewing video.
The invention still further relates to the car-mounted terminal of a kind of Tape movement TV, including signal receiving chip 100, central processing element 200, main frame 300, condition receiving system 400, serial flash 500, power supply 600.Described signal receiving chip 100 is all connected with power supply with central processing element 200, and described signal receiving chip 100 is for receiving CMMB signal the CMMB signal demodulation that will receive；Described central processing element 200 is connected with described signal receiving chip 100, for being converted to audio signal and video signal and will be conveyed to main frame 300 by the CMMB signal after demodulation.Described condition receiving system 400 is connected with central processing element 200, is used for managing user and Management Television program；Described serial flash 500 is connected with central processing element 200, is used for carrying out information storage and renewal.
The present invention can be implemented in and watches CMMB TV programme clearly under the mobile status of automobile, has good convenience, real-time and motility, and the signal received is digital signal, there is not noise jamming, thus ensure that the quality that TV programme are play.Described signal receiving chip 100 uses baseband radio chip, utilizes baseband radio chip can realize frequency hopping, thus obtains preferable confidentiality and capacity of resisting disturbance.
Wherein, described signal receiving chip 100 is connected with central processing element 200 by Serial Peripheral Interface (SPI)；Interrupt request line also it is connected with between described signal receiving chip 100 and central processing element 200.Utilize Serial Peripheral Interface (SPI) that central processing element 200 and various ancillary equipment can be made to communicate in a serial fashion to exchange information.Periphery arranges flash memory, network controller, LCD display driver and A/D converter etc..Serial Peripheral Interface (SPI) is used to be transmitted different from common serial communication, common serial communication one-time continuous transmits at least 8 bit data, and Serial Peripheral Interface (SPI) allows the transmission of data one, even allow for suspending, because its clock line is by main control device control, when there is no clock transition, do not gather from equipment or transmit data.It is to say, main equipment is by completing the control to communication to the control of clock line.In point-to-point communication, Serial Peripheral Interface (SPI) is made without addressing operation, and is full-duplex communication, it appears the most efficient.
Described central processing element 200 realizes communication connection by asynchronous serial communication interface and Serial Peripheral Interface (SPI) with main frame 300.The serial data come outside computer can be converted to byte by asynchronous serial communication interface, and the device for computer-internal parallel data uses.In the serial data stream of output, add parity check bit, and carry out even-odd check to from the data stream of external reception.Start and stop labelling is added in output stream, and from receiving, data stream is deleted start and stop labelling, also can locate reason keyboard or interrupt signal (keyboard and mouse are also serial devices) that mouse sends and the management by synchronization problem that processes computer and external series equipment.
Described central processing element 200 passes through Composite Video Baseband Signal interface by video signal transmission to main frame 300.Composite Video Baseband Signal 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 (tone and saturation) and brightness (bright) information, and they is synchronized in blanking pulse, transmits with same signal.Described central processing element passes through dual-channel audio analogue signal by audio signal transmission to main frame.Double track realizes stereosonic principle exactly, places two mutual angled speakers in space, and each speaker is individually provided signal by a sound channel.And the signal of each sound channel just have passed through process recording when: the principle of process imitates the human ear Biological Principles when nature hears sound, and (people is ears, according to left and right ear, acoustical phase difference can be judged the particular location of sound source) when hearing sound, show on circuit the most namely two sound channel signals difference in phase place, so just can experience stereosonic effect when station is to listening in the axial line joining of two speakers.
Described car-mounted terminal also includes that condition receiving system 400, described condition receiving system 400 are connected with central processing element 200.The composition of condition receiving system 400 includes: Subscriber Management System SMS, business information generate system SIG, program PMS/SI editing system, program scheduling process EIS, user authorization management system SAS, condition reception CA etc..Mainly having two major parts: one piece is the SMS of management user, one piece is the CA of managing programm.CA is broadly divided into two large divisions: one is signal scrambling part, and it is to control the scrambler scrambling to signal by random code (referred to as Control Word) produced by a random code generator；Two is encryption part, the signal of scrambling to be made successfully descrambles at receiving terminal, receiving terminal is also it is necessary to have control descrambler with the scrambling living control word of end, so, the CW of front end is sent to receiving terminal, if directly transmission can be easy to be intercepted and captured by hacker and make CAS ineffective, for this, CW is encrypted transmission, this encryption is a kind of multi-layer security mechanism, thus increase the safety that CW transmits, ciphertext produced by the ground floor directly encrypted CW is referred to as Entitlement Control Message ECM, transmitted together with the code stream of scrambling by multiplexer, ECM is possibly together with the time, program price, the information such as program authorization control, therefore ECM is the management information towards program.The key of CW encryption is referred to as working key SK, and SK is the most again moon key, monthly changes once, often changes a SK, and all users will be authorized by system again.Second layer encryption is to be encrypted SK with referred to as program key PDK, produced ciphertext and the authorized order obtained from SMS form Entitlement Management Message EMM, EMM possibly together with intelligent card numbers, the mandate authorized user message such as time, authorization mechanism by the authorization message that SAS generates.If these information spinners complete the mandate to user, therefore EMM is user oriented management information, when user is seen, sees that what channel authorizes by EMM, and it transmits together with scrambling code stream also by multiplexer, and the above constitutes the encryption system that CA is most basic.
Described car-mounted terminal also includes that serial flash 500, described serial flash 500 are connected with central processing element 200.Serial flash 500 renewal speed is very fast (between the 10-30 second), and it is high to update motility, just can realize because having only to bare board (being easy to exploitation, manufacture, memory block renewal or maintenance).
The present invention can be implemented in and watches CMMB TV programme clearly under the mobile status of automobile, has good convenience, real-time and motility, and the signal received is digital signal, there is not noise jamming, thus ensure that the quality that TV programme are play.
First embodiment of the car-mounted terminal of Tape movement TV of the present invention, including signal receiving chip 100, for receiving CMMB signal the CMMB signal demodulation that will receive.This signal receiving chip 100 is connected by data asynchronous serial communication interface and control asynchronous serial communication interface with central processing element 200, two-way asynchronous serial communication interface is divided into control asynchronous serial communication interface and data asynchronous serial communication interface, use independent data asynchronous serial communication interface to transmit for the information of big data quantity, prevent public asynchronous serial communication interface from causing control command to block.The communication wherein controlling asynchronous serial communication interface is configured that traffic rate is that 115200bps, 1bit stop position, no parity position.Central processing element includes converting unit 220 and transmission unit 230, CMMB signal after demodulation is converted to audio signal and video signal according to user instruction by described converting unit 220, CMMB signal after will demodulating carries out H.264 (the digital video coding-coding device standard of a kind of high compression) decoding of video signal and obtains video signal, and the decoding simultaneously carrying out audio signal obtains audio signal.Described transmission unit 230 for by described audio signal and video signal transmission to main frame 300, during transmission, audio signal is transferred to main frame by audio analog signals interface, and video signal is transferred to main frame 300 by Composite Video Baseband Signal (Composite Video Broadcast Signal is called for short " CVBS ") interface.Described central processing element also includes sequencing unit 210, for the programme of the CMMB signal after demodulation is ranked up, and the programme list of the CMMB signal after sequence is transferred to described main frame 300, that is, sequencing unit 210 is according to Business Name, reproduction time, TV guide, the information such as content outline are ranked up, and the programme list of the CMMB signal after sequence is transferred to main frame 300, make can show on the display screen of main frame 300 guide information of current business, the content of display screen display is as shown in table 1, table 1 is ranked up according to reproduction time, TV guide part therein can be video clip.
Table 1
| Business Name | Reproduction time | TV guide | Content outline |
| First finance and economics | 8:00-9:00 | ...... | Current stock market is analyzed dynamic by ×× |
| Walk close to science | 8:30-9:30 | ...... | The prevention of hand-foot-mouth disease |
| Rumor terminator | 9:30-11:00 | ...... | Sound only according to the mankind can shatter glass？ |
As can be seen here, the present invention can be implemented in and watches CMMB TV programme clearly under the mobile status of automobile, has good convenience, real-time and motility, and the signal received is digital signal, there is not noise jamming, thus ensure that the quality that TV programme are play.Also by sequencing unit, programme corresponding for CMMB signal is transferred to main frame by the way of list so that user can be known by the display screen on main frame and plays the program inventory maybe will play, so that user watches TV more targeted.
Second embodiment of the car-mounted terminal of Tape movement TV of the present invention, roughly the same with the first embodiment, its difference is, central processing element described in present embodiment also includes judging unit 240, for judging whether the CMMB signal after demodulation exists urgent broadcast CMMB signal, if there is then notifying that converting unit 220 carries out signal conversion to this urgent broadcast CMMB signal, and pass through the video signal after transmission unit 230 will be changed and audio signal transmission to main frame.That is, when the CMMB signal after demodulation includes urgent broadcast CMMB signal, converting unit can automatically be found out this urgent broadcast CMMB signal according to the instruction of judging unit and convert the signal into audio signal and video signal, urgent broadcast CMMB signal after will demodulating carries out the H.264 decoding of video signal and obtains video signal, the decoding simultaneously carrying out audio signal obtains audio signal, again by Composite Video Baseband Signal interface, the video signal obtained being transferred to main frame 300, audio signal is transferred to main frame 300 by audio analog signals interface.So user can learn where there occurs emergency immediately, thus avoids the trouble that some are unnecessary.Wherein, this services user and can arrange the most open-minded voluntarily, and wherein emergency broadcast signal is also not limited to some catastrophic events, it is also possible to include the information such as stock information, communication navigation, weather forecast.
It is seen that, the present invention can be implemented in and watches CMMB TV programme clearly under the mobile status of automobile, has good convenience, real-time and motility, and the signal received is digital signal, there is not noise jamming, thus ensure that the quality that TV programme are play.Also by sequencing unit, programme corresponding for CMMB signal is transferred to main frame by the way of list so that user can be known by the display screen on main frame and plays the program inventory maybe will play, so that user watches TV more targeted.
The above; being only the present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto, and any is familiar with the people of this technology in the technical scope that disclosed herein; the change that can readily occur in or replacement, all should contain within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with scope of the claims.
Claims (10)
1. a car-mounted terminal video playback apparatus, it is characterised in that its workflow comprises the following steps: A, video is cut
It is slit into video segment；B, video segment is become original video and voice data according to original Video coding with sound code parsing；
C, original video and voice data are packaged according to the video format of mobile device support；D, by packaged video according to
The video playback standard output of mobile device, to the player of mobile device, plays out.
A kind of car-mounted terminal video playback apparatus the most according to claim 1, it is characterised in that include for receiving
CMMB signal and by the CMMB signal received demodulate signal receiving chip, be connected with signal receiving chip central authorities process
Chip；Described signal receiving chip includes receiving radiofrequency signal and channel selecting signal and radiofrequency signal being down-converted to intermediate-freuqncy signal
Frequency-variable module and described intermediate-freuqncy signal is carried out the adjustment module of analog-to-digital conversion process and demodulation process；Described central authorities process core
Sheet includes, according to user instruction, the CMMB signal after demodulation is converted to audio signal and the converting unit of video signal and by institute
State audio signal and video signal transmission to the transmission unit of main frame.
A kind of car-mounted terminal video playback apparatus the most according to claim 1, it is characterised in that described signal receiving chip,
The central processing element being connected with signal receiving chip is integrated in single integrated circuit.
A kind of car-mounted terminal video playback apparatus the most according to claim 1, it is characterised in that described central processing element
Also include sequencing unit, for being ranked up by the programme of the CMMB signal after demodulation, and by the CMMB letter after sequence
Number programme list be transferred to described main frame.
A kind of car-mounted terminal video playback apparatus the most according to claim 1, it is characterised in that described central processing element
Also include judging unit, for judging whether the CMMB signal after demodulation exists urgent broadcast CMMB signal, if there is
Then notice converting unit carries out signal conversion to this urgent broadcast CMMB signal, and by transmission unit by the video after conversion
Signal and audio signal transmission are to main frame.
A kind of car-mounted terminal video playback apparatus the most according to claim 1, it is characterised in that described signal receiving chip
And be connected with controlling asynchronous serial communication interface by data asynchronous serial communication interface between central processing element, described signal connects
Receive chip and use baseband radio chip.
A kind of car-mounted terminal video playback apparatus the most according to claim 1, it is characterised in that described Tape movement TV
Car-mounted terminal also includes that condition receiving system, described condition receiving system are connected with central processing element.
A kind of car-mounted terminal video playback apparatus the most according to claim 1, it is characterised in that described Tape movement TV
Car-mounted terminal also includes that serial flash, described serial flash are connected with central processing element.
A kind of car-mounted terminal video playback apparatus the most according to claim 1, it is characterised in that described central processing element
Communication connection is realized with main frame by asynchronous serial communication interface and Serial Peripheral Interface (SPI).
A kind of car-mounted terminal video playback apparatus the most according to claim 1, it is characterised in that described central authorities process core
Sheet passes through Composite Video Baseband Signal interface by video signal transmission to main frame；Described central processing element passes through dual-channel audio mould
Intend signal by audio signal transmission to main frame.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410812185.6A CN105791955A (en) | 2014-12-23 | 2014-12-23 | Vehicle-mounted terminal video playing equipment |
| GB201423259A GB201423259D0 (en) | 2014-12-23 | 2014-12-29 | The video playback equipment based on the car terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410812185.6A CN105791955A (en) | 2014-12-23 | 2014-12-23 | Vehicle-mounted terminal video playing equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105791955A true CN105791955A (en) | 2016-07-20 |
Family
ID=52471548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410812185.6A Pending CN105791955A (en) | 2014-12-23 | 2014-12-23 | Vehicle-mounted terminal video playing equipment |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN105791955A (en) |
| GB (1) | GB201423259D0 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106089749A (en) * | 2016-06-24 | 2016-11-09 | 合肥欧克斯新型建材有限公司 | The centrifugal pump that a kind of industrial machinery seals |
| CN109743383A (en) * | 2018-12-29 | 2019-05-10 | 王彬 | Adaptive cloud computing Channel Processing platform |
| CN111372011A (en) * | 2020-04-13 | 2020-07-03 | 杭州友勤信息技术有限公司 | KVM high definition video decollator |
-
2014
- 2014-12-23 CN CN201410812185.6A patent/CN105791955A/en active Pending
- 2014-12-29 GB GB201423259A patent/GB201423259D0/en not_active Ceased
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106089749A (en) * | 2016-06-24 | 2016-11-09 | 合肥欧克斯新型建材有限公司 | The centrifugal pump that a kind of industrial machinery seals |
| CN109743383A (en) * | 2018-12-29 | 2019-05-10 | 王彬 | Adaptive cloud computing Channel Processing platform |
| CN109743383B (en) * | 2018-12-29 | 2020-07-03 | 浩德科技股份有限公司 | Self-adaptive cloud computing channel processing platform |
| CN111372011A (en) * | 2020-04-13 | 2020-07-03 | 杭州友勤信息技术有限公司 | KVM high definition video decollator |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201423259D0 (en) | 2015-02-11 |
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Application publication date: 20160720 |