CN101808203A - Mobile phone CMMB system and implementation method thereof - Google Patents

Mobile phone CMMB system and implementation method thereof Download PDF

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Publication number
CN101808203A
CN101808203A CN200910046158A CN200910046158A CN101808203A CN 101808203 A CN101808203 A CN 101808203A CN 200910046158 A CN200910046158 A CN 200910046158A CN 200910046158 A CN200910046158 A CN 200910046158A CN 101808203 A CN101808203 A CN 101808203A
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chip
cmmb
multimedia process
mobile phone
baseband
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CN200910046158A
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滕德强
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Shenyang Chenxun Simcom Technology Co Ltd
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Shenyang Chenxun Simcom Technology Co Ltd
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Abstract

The invention discloses a mobile phone CMMB system and an implementation method thereof. The system comprises a demodulating chip, a multimedia processing chip, an LCD display module and a baseband chip, wherein the demodulating chip is used for receiving, demodulating and demultiplexing CMMB signals; the multimedia processing chip is connected with the demodulating chip and is used for performing video decoding on demultiplexed data, sending audio data to an audio decoding chip and decoding the audio data to complete the audio and video synchronization; the LCD display module is connected with the multimedia processing chip and is used for playing CMMB television programs or displaying baseband refreshing; and the baseband chip is connected with the multimedia processing chip and the audio decoding chip and is used for controlling the multimedia processing chip and the audio decoding chip. The mobile phone CMMB system can realize that the CMMB television programs can be watched clearly in a moving state of a mobile phone, has high convenience, timeliness and flexibility, receives digital signals, and has no noise interference, so the playing quality of the television programs is ensured.

Description

Mobile phone CMMB system and its implementation
Technical field
The present invention relates to a kind of mobile phone CMMB (China Mobile Multimedia Broadcasting, China Mobile's DMB) system, particularly relate to a kind of mobile phone CMMB system and its implementation.
Background technology
Along with the development of domestic mobile phone, the increase of cell-phone function, press for the business that provides abundant more.Because the portability and the mobility of mobile phone terminal, make mobile phone TV services have more influence power and market potential than common TV, mobile 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 mobile phone terminal both can playing audio-video, again can videotex information; Both can play in real time, again certain memory function can be arranged, and possess mutual function, therefore we can say the feature of all medium up to now that it is integrated.The more important thing is, mobile phone terminal not only lightly but also can move, whenever where, the user can obtain service easily, so mobile TV is considered as one of 3G most promising multimedia service of epoch by a lot of people.The present cellphone subscriber of China also reaches about 3.5 hundred million and China has the family of television set near 400,000,000.Both will produce a huge consumption market in conjunction with the mobile phone TV services that produced.Show that according to external prediction to the whole world in 2010 1.2 hundred million mobile phone television users will be arranged, the number of users of China also will be near 4,000 ten thousand.In the face of huge mobile subscriber group and radio and television customer group, great concern has been dropped into to this business in the Virtual network operator of various countries and device fabrication commercial city, wishes to make its new growth that becomes mobile multi-media service point.Therefore, domestic relatively related industry, mobile TV is a rare opportunity to develop, also is the good opportunity of an autonomous innovation simultaneously.The CMMB television standard by the Olympic Games popularize fast and commercial, catch the current opportune time to actively develop the mobile TV technology and Study on standards work provides advantage to China, thereby lay a solid foundation in the benign development of China for this business.
Summary of the invention
The invention provides a kind of novel mobile phone CMMB system and its implementation.
The present invention solves above-mentioned technical problem by following technical proposals: a kind of mobile phone CMMB system, and its characteristics are that it comprises: a demodulation chip is used to receive the CMMB signal and with its demodulation and demultiplexing; The one multimedia process chip that links to each other with this demodulation chip is used for the data behind the demultiplexing are carried out video decode, and voice data is sent to audio decoder chip decoding, and finishes the synchronous of audio frequency and video; The one LCD display module that links to each other with this multimedia process chip is used to play the CMMB TV or shows base band brush screen; One baseband chip links to each other with the audio decoder chip with this multimedia process chip, is used to control this multimedia process chip and audio decoder chip.
Wherein, this baseband chip comprises the control of this multimedia process chip and audio decoder chip: when playing the CMMB TV, this baseband chip and multimedia process chip are carried out data interaction, control this LCD display module by this multimedia process chip, this audio decoder chip decoding is from the voice data of this multimedia process chip; When showing base band brush screen, this multimedia process chip and audio decoder chip all are in direct mode operation, control this LCD display module by this baseband chip.
Preferably, this multimedia process chip links to each other with the LCD interface of baseband chip by the lcd controller of this baseband chip.
Another technical scheme of the present invention is: a kind of implementation method of above-mentioned mobile phone CMMB system, and its characteristics are that it may further comprise the steps: S1, this demodulation chip receive CMMB signal and with its demodulation and demultiplexing; S2, this baseband chip and multimedia process chip are carried out data interaction, and the data of this multimedia process chip after to demultiplexing are carried out video decode, and voice data is sent to this audio decoder chip decoding, and finish audio frequency and video synchronously; S3, this multimedia process chip are controlled this LCD display module and are play the CMMB TV.
Wherein, when showing base band brush screen, this multimedia process chip and audio decoder chip all are in direct mode operation, control this LCD display module by this baseband chip.
Wherein, the data interaction between this baseband chip and multimedia process chip may further comprise the steps: S21, this baseband chip send event request to this multimedia process chip; S22, this multimedia process chip are handled this request back and are produced interruption, and the data of finishing dealing with are sent to this baseband chip; S23, this baseband chip judge whether it is the incident that need reply, if not, then directly return; If then this incident is handled.
Positive progressive effect of the present invention is: the present invention can be implemented under the mobile status of mobile phone and watches CMMB TV programme clearly, have good convenience, real-time and flexibility, and the signal that receives is a digital signal, there is not noise jamming, thereby guaranteed the play quality of TV programme.
Description of drawings
Fig. 1 is the structural representation of mobile phone CMMB system of the present invention.
Fig. 2 is the software architecture schematic diagram of mobile phone CMMB system of the present invention.
Fig. 3 is the flow chart of the implementation method of mobile phone CMMB system of the present invention.
Fig. 4 is the flow chart of data interaction between baseband chip among the present invention and multimedia process chip.
Fig. 5 is the startup flow chart of mobile phone CMMB system of the present invention.
Fig. 6 is the closing flow path figure of mobile phone CMMB system of the present invention.
Embodiment
Provide preferred embodiment of the present invention below in conjunction with accompanying drawing, to describe technical scheme of the present invention in detail.
The invention provides a kind of mobile phone CMMB system and its implementation, a kind of MTK of being applicable to (MediaTek Inc) especially is provided mobile phone CMMB system and its implementation of mobile phone terminal.
As shown in Figure 1, mobile phone CMMB system of the present invention comprises: peripheral circuits such as a demodulation chip 1, a multimedia process chip 2, an audio decoder chip 3, a LCD (Liquid Crystal Display, LCD) display module 4, a baseband chip 5 and crystal oscillator.This demodulation chip 1 is used to receive aerial CMMB signal, and with this signal demodulation and demultiplexing.This demodulation chip 1 links to each other with multimedia process chip 2, by I2C (Inter Integrated Circuit, built-in integrated circuit) interface carries out the order transmission, carries out data interaction by SPI (Serial Peripheral Interface, Serial Peripheral Interface) interface.This multimedia process chip 2 is used for the data behind the demultiplexing are carried out H.264 (a kind of digital video coding-coding device standard of high compression) decoding of vision signal, and voice data is sent to this audio decoder chip 3 carries out audio decoder, this multimedia process chip 2 also is responsible for the audio mixing of the left and right acoustic channels of audio frequency, audio, video data synchronously, and the CMMB that responds this baseband chip 5 request of televising, as channel selection, channel setting and inquiry etc., respond GUI (the Graphical User Interface of this baseband chip 5, graphic user interface) shows request, produce and send anomalous events to this baseband chip 5, as signal interruption etc., maintenance and management CMMB player graphical interfaces simultaneously.These multimedia process chip 2 carries are on the LCD of the lcd controller of this baseband chip 5 interface, communication two party all meets x86 (a cover general calculation machine instruction set) interface protocol, comprise interface level, control logic, signal sequence etc., the function of lcd controller can be made full use of like this, and the LCD display module 4 of 18Bits can be directly supported.These LCD display module 4 carries are on this multimedia process chip 2, this baseband chip 5 then is used to control this multimedia process chip 2 and audio decoder chip 3, as the control of LCD Bypass Control, power supply, program download, running parameter setting and preservation, volume are regulated, straight-through etc., and be responsible for receiving user's input and operation CMMB player, and monitor the incident that its chip sends and make response.
When showing normal base band brush screen, only bypass (bypass) pin need be changed to high level, this multimedia process chip 2 is in direct mode operation like this, by refreshing of the screen of these baseband chip 5 these LCD display modules of control; Simultaneously, this audio decoder chip 3 also is in direct mode operation, directly the voice-frequency channel of this baseband chip 5 is delivered to loud speaker or earphone peripheral hardware.
When playing the CMMB TV, the bypass pin is changed to low level, at this moment this multimedia process chip 2 starts, finish data interaction between this baseband chip 5 and the multimedia process chip 2 by the baseband chip bus, signal from this baseband chip 5 is admitted to this multimedia process chip 2, the LCD interface of multimedia process chip one side is then taken over by this multimedia process chip 2, when this multimedia process chip 2 is ready to send to the data of this baseband chip 5, it can send indication to this baseband chip 5 by the external interrupt of TCC INT (external interrupt pin), interrupt as HPINT (interruption of HPI interface) or GPIO interface, and this baseband chip 5 can in time respond the state variation of TCC INT, EHI (External Host Interface by this multimedia process chip 2 of Interrupt Process function call, the external piloting control interface) interrupt service routine, this baseband chip 5 is regarded this multimedia process chip 2 as and is met the x86 interface sequence at this moment, data-bus width is 8 or 16 s' SRAM (Static RAM, static random access memory), thus play the CMMB TVs by this multimedia process chip 2 control LCD display modules 4.Because playing the frame per second of TV was 25 frame/seconds, thus Vsync (Vertical Synchronization, the vertical synchronization) pin of LCD must be connected, otherwise can cause playing split screen.At this moment, this audio decoder chip 3 is responsible for receiving voice data that the multimedia process chip sends and with its decoding by IIS (Inter-IC Sound bus, a kind of serial digital audio-frequency bus agreement) interface, and regulates volume.
Figure 2 shows that software architecture of the present invention, mainly comprise application layer 11, CMMB API (Application Programming Interface, application programming interface) the L4 layer of interface layer 12, IPC (Inter Process Communication, interprocess communication) consultative management layer 13, EHI bus driver layer 14, IO (input and output) Drive Layer 15, system's adaptation layer 16 and responsible queue management.This application layer 11 mainly is in charge of the CMMB software program, comprises that menu starts, closes CMMB, regulates CMMB volume, backlight illumination, quiet setting or the like, and the interface alternation of finishing user and CMMB.The startup of 12 managing I PC of this CMMB api interface layer communication, multimedia process chip 2 and close, the download of firmware etc.This IPC consultative management layer 13 is responsible for finishing the communication mechanism of IPC.The transfer of data that this EHI bus driver layer 14 is responsible for finishing between baseband chip 5 and the multimedia process chip 2 drives, and comprises bus transfer driving, the driving of Interrupt Process function etc.This IO Drive Layer 15 is responsible for finishing to the initialization of IO mouth and the Interface design of transfer of data.This system's adaptation layer 16 is responsible for providing the interface of system, and the scheduling between each module.This L4 layer is the queue management layer, is responsible for accepting message, and message is sent into formation, then MMI task (Man Machine Interface task, man-machine interface task) is sent in the message scheduling and handles.
Figure 3 shows that the flow chart of the implementation method of mobile phone CMMB system of the present invention, may further comprise the steps:
Step 100, the user selects to play the CMMB TV and still shows normal base band brush screen, if select to play CMMB TV, then execution in step 101-103; If select to show normal base band brush screen, then execution in step 104.
Step 101, this demodulation chip receive CMMB signal and with its demodulation and demultiplexing.
Step 102, this baseband chip and multimedia process chip are carried out data interaction, the data of this multimedia process chip after to demultiplexing are carried out video decode, and voice data is sent to this audio decoder chip decoding, and finish audio frequency and video synchronously.
Step 103, this multimedia process chip are controlled this LCD display module and are play the CMMB TV.
Step 104, this multimedia process chip and audio decoder chip all are in direct mode operation, control the demonstration that this LCD display module carries out base band brush screen by this baseband chip.
Figure 4 shows that the data interaction flow process between this baseband chip and the multimedia process chip, may further comprise the steps:
Step 200, this baseband chip sends event request by IPC mechanism to this multimedia process chip, as menu selection, channel selection, volume adjusting, brightness regulation, quiet the button request is set etc.
Step 201, this multimedia process chip is classified to the request event of sending, and it is entered the IPC message queue.
Produce after step 202, this multimedia process chip are finished dealing with and interrupt, start the Interrupt Process function, simultaneously the information of finishing dealing with is sent to this baseband chip by the lcd controller bus.
Step 203, the Interrupt Process function of this baseband chip compares the IPC message that the message queue among the IPC and bus send over, judge whether this incident is the incident that needs this baseband chip to handle, for example volume adjusting, brightness regulation, quiet setting, menu withdraw from request etc., if, execution in step 204-206 then, if not, then directly return.
Step 204, the Interrupt Process function of this baseband chip are sent out message and are given UEM (a kind of interface that external equipment is connected of mobile phone) layer, are handled by UEM task (UEM task).
Step 205, this UEM layer is sent to the L4 layer with message, and this L4 layer enters formation with message, unifies scheduling.
Step 206, MMI task (MMI task) receives related news from the L4 layer, and finishes relevant treatment.
Figure 5 shows that the flow chart that starts mobile phone CMMB system of the present invention, may further comprise the steps:
Step 300 enters CMMB from menu, and relevant keypress function is set.
Step 301, hang-up FM is quiet, MP3 plays, and keypad tone.
Step 302 is provided with LCD screen Chang Liang, starts the multimedia process chip, its I/O mouth of initialization.
Step 303, the IPC management of initialization CMMB.
Step 304, initialization EHI bus and digital TV platform.
Step 305, initialization CMMB graphics engine.
Step 306 is opened the power supply of multimedia process chip and the switch of lcd controller, and full screen window is set.
Step 307 drags down the bypass pin, gives the multimedia process chip with the control of LCD display module, brushes screen by the multimedia process chip.
Step 308, the SDRAM of initialization multimedia process chip (Synchronous DynamicRandom Access Memory, Synchronous Dynamic Random Access Memory), the firmware program that is kept in the baseband chip flash memory is downloaded among the SDRAM of multimedia process chip by bus, and carry out firmware program.
Step 309 reads some configuration informations such as the rendition list from NVRAM (Non-Volatile Random Access Memory, nonvolatile random access memory).
Step 310 judges whether to insert and encrypts the T card, if the card that CA (Conditional Access, condition reception technique) encrypts exists, then starts the encryption software program.
So far, whole mobile phone CMMB system starts, and the user can normally watch the CMMB TV programme and carry out other digital television business.
Figure 6 shows that the flow chart of closing mobile phone CMMB system of the present invention, may further comprise the steps:
Step 400 selects to withdraw from menu, starts and withdraws from the software of CMMB flow process, and at first withdraw from the encryption software program.
Step 401 is saved in NVRAM with the rendition list and some configuration informations.
Step 402 is closed the external interrupt of multimedia process chip and the pin of power supply control.
Step 403, the bypass pin enabled is drawn high, and the control of LCD display module is transferred to baseband chip control.
Step 404 is closed the lcd controller switch, avoids the interference of multimedia process chip to LCD, and base band brush screen can reopen the lcd controller switch.
Step 405, FM is quiet, MP3 plays and keypad tone recovers the normal mode that is set to backlight.
So far, then finished the flow process that withdraws from of mobile phone CMMB system.
The present invention can be implemented under the mobile status of mobile phone 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 play quality of TV programme.
Though more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, under the prerequisite that does not deviate from principle of the present invention and essence, can make numerous variations or modification to these execution modes.Therefore, protection scope of the present invention is limited by appended claims.

Claims (6)

1. mobile phone CMMB system is characterized in that it comprises:
One demodulation chip is used to receive the CMMB signal and with its demodulation and demultiplexing;
The one multimedia process chip that links to each other with this demodulation chip is used for the data behind the demultiplexing are carried out video decode, and voice data is sent to audio decoder chip decoding, and finishes the synchronous of audio frequency and video;
The one LCD display module that links to each other with this multimedia process chip is used to play the CMMB TV or shows base band brush screen;
One baseband chip links to each other with the audio decoder chip with this multimedia process chip, is used to control this multimedia process chip and audio decoder chip.
2. mobile phone CMMB system as claimed in claim 1, it is characterized in that, this baseband chip comprises the control of this multimedia process chip and audio decoder chip: when playing the CMMB TV, this baseband chip and multimedia process chip are carried out data interaction, control this LCD display module by this multimedia process chip, this audio decoder chip decoding is from the voice data of this multimedia process chip; When showing base band brush screen, this multimedia process chip and audio decoder chip all are in direct mode operation, control this LCD display module by this baseband chip.
3. mobile phone CMMB system as claimed in claim 1 is characterized in that, this multimedia process chip links to each other with the LCD interface of baseband chip by the lcd controller of this baseband chip.
4. the implementation method of a mobile phone CMMB system as claimed in claim 1 is characterized in that, it may further comprise the steps:
S1, this demodulation chip receive CMMB signal and with its demodulation and demultiplexing;
S2, this baseband chip and multimedia process chip are carried out data interaction, and the data of this multimedia process chip after to demultiplexing are carried out video decode, and voice data is sent to this audio decoder chip decoding, and finish audio frequency and video synchronously;
S3, this multimedia process chip are controlled this LCD display module and are play the CMMB TV.
5. the implementation method of mobile phone CMMB system as claimed in claim 4 is characterized in that, when showing base band brush screen, this multimedia process chip and audio decoder chip all are in direct mode operation, control this LCD display module by this baseband chip.
6. the implementation method of mobile phone CMMB system as claimed in claim 4 is characterized in that, the data interaction between this baseband chip and multimedia process chip may further comprise the steps:
S21, this baseband chip send event request to this multimedia process chip;
S22, this multimedia process chip are handled this request back and are produced interruption, and the data of finishing dealing with are sent to this baseband chip;
S23, this baseband chip judge whether it is the incident that need reply, if not, then directly return; If then this incident is handled.
CN200910046158A 2009-02-13 2009-02-13 Mobile phone CMMB system and implementation method thereof Pending CN101808203A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102184715A (en) * 2011-01-30 2011-09-14 广东佳和通信技术有限公司 Screen refreshing device and method based on syncretic communication terminal
CN102629471A (en) * 2012-03-07 2012-08-08 深圳市福智软件技术有限公司 Multi-decoder audio system, system signal flow and composed mobile equipment

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102184715A (en) * 2011-01-30 2011-09-14 广东佳和通信技术有限公司 Screen refreshing device and method based on syncretic communication terminal
CN102184715B (en) * 2011-01-30 2012-11-28 广东佳和通信技术有限公司 Screen refreshing device and method based on syncretic communication terminal
CN102629471A (en) * 2012-03-07 2012-08-08 深圳市福智软件技术有限公司 Multi-decoder audio system, system signal flow and composed mobile equipment
WO2013131367A1 (en) * 2012-03-07 2013-09-12 福兴达科技实业（深圳）有限公司 Multi-decoder audio system, system signal procedure, and formed mobile device

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Application publication date: 20100818