CN101494744A - Mobile terminal and method for playing digital television signal - Google Patents
Mobile terminal and method for playing digital television signal Download PDFInfo
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Abstract
The present invention relates to the field of mobile communications, specifically to a technology of playing digital television signal at mobile terminal. The present invention provides a mobile terminal and a method thereof for playing digital television signal, including: in a first time period of each clock cycle, the mobile terminal performing software decoding to the received digital television signal, and playing the decoded media data; in a second time period of each clock cycle, the mobile terminal communicating with the network side. Because of periodically setting execute time for decoding role and communication role of the mobile terminal, the invention not only guarantees the basic functions of mobile terminals, but also achieves decoding of digital TV signals through the software; so that the audio and video decoders of hardware are saved, and the mobile terminal can simultaneously realize the playing of digital television signals and achieves the object of saving internal space of the mobile terminal and reducing the hardware cost of the mobile terminal.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to the technology of mobile terminal playing digital television signal.
Background technology
The hybrid network system that radio network combines with the mobile network, the bearer network that can be used as mobile multi-media broadcasting service sends digital television signal in the mode of " point-to-point " or " a bit to multiple spot " to portable terminal.
The portable terminal of prior art receives the digital signal that network side sends, and its internal structure comprises as shown in Figure 1: radio-frequency module 101, control module 102, display module 103, audio/video decoder 104 and audio playing module 105.Wherein, comprise in the radio-frequency module 101: antenna 111, frequency synthesis unit 112, television receiver unit 113.
The control module 102 of portable terminal generally includes processor and memory, in order to carry out the various task programs (such as searching task programs such as net, switching, MP3 broadcast) of terminal.
Antenna 111 comprises antenna-matching circuit, realizes effective reception of digital signal.
After 104 pairs of audio, video data decodings of audio/video decoder, decoded video data is sent to display module 103 play demonstration, and by the voice data behind the synchronous output decoder to audio playing module 105, drive the loud speaker playback through the audio frequency power amplifier of audio playing module 105.
Yet the portable terminal of prior art need adopt the audio/video decoder of hardware to realize method to the decoding of audio, video data, the more confined space that takies portable terminal inside, and the hardware cost of portable terminal is also higher.
Summary of the invention
A kind of portable terminal that the embodiment of the invention provides and the method for playing digital television signal thereof realize the hardware cost of playing digital television signal in order to reduce portable terminal, and save the inner space of portable terminal.
A kind of method of mobile terminal playing digital television signal comprises:
In the very first time of each clock cycle section, portable terminal carries out software decode to the digital television signal that receives, and decoded media data is play;
In second time period of described clock cycle, described portable terminal and network side carry out communication.
Video data in the decoded media data is play, is specifically comprised:
For the video data behind each frame decoding, these frame data and previous frame data are compared the data of having determined to change according to comparative result;
After the described data of determining that changed are carried out size scaling computing, video data format conversion, be written in the buffer memory of display screen and refresh demonstration.
A kind of portable terminal comprises: radio-frequency module, display module and audio playing module also comprise:
Control module, be used in the very first time of each clock cycle section, to carry out software decode from the digital television signal that described radio-frequency module receives, and decoded voice data and video data will be play by described audio playing module, display module respectively; In second time period of described clock cycle, carry out communication with network side.
Described control module comprises:
The cycle monitoring submodule is used for when each clock cycle arrives, and sends first and handles notice; When determining that described very first time section arrives, send first expiry notification, and send the second processing notice;
The processing television signals submodule, be used for handling notice according to described first, to carry out software decode from the digital television signal that described radio-frequency module receives, and decoded voice data and video data will be play by described audio playing module, display module respectively; And when receiving described first expiry notification, stop processing to digital television signal;
The communication processing sub is used for carrying out communication receiving described second when handling notice with network side.
Described processing television signals submodule comprises:
The Data Receiving unit is used for receiving described first when handling notice, and the digital television signal according to receiving from described radio-frequency module decomposites voice data and video data; When receiving described first expiry notification, stop decomposition to digital television signal;
The video data processing unit after being used for described video data carried out decoding processing, is play by described display module;
The voice data processing unit after being used for described voice data carried out decoding processing, is play by described audio playing module.
Described video data processing unit comprises:
The video data decoding subelement is used for described video data is decoded;
The estimation subelement is used for for the video data behind each frame decoding, these frame data and previous frame data compared the data of having determined to change according to comparative result;
The data conversion subelement, be used for variation that described estimation subelement is determined data carry out computing and Data Format Transform;
Show and to refresh subelement, be used for that described data conversion subelement is carried out data after the video data format conversion and be written to the display screen buffer memory and refresh demonstration.
The portable terminal of the embodiment of the invention is owing to carry out sound, video software decoding with the time of setting to the digital television signal that receives in each process cycle, and decoded video data displayed the play by display screen, remainingly in the process cycle then carry out other task or free time At All Other Times by portable terminal; For the communication task of decoding task and portable terminal has all periodically been set the time of implementation, thereby the basic function that had both guaranteed portable terminal (comprises and obtains, handles the information that wireless network sends, and return relevant information), realized again coming the decoded digital TV signal by software; And, owing to by software approach decoded digital TV signal, saved the audio/video decoder of hardware, thereby reduced the hardware cost of portable terminal realization playing digital television signal, and the inner space of having saved portable terminal, reduced mobile terminal power consumption in addition.
Further, owing in the process that decoded video data is play, adopted the method for estimation, being about to current frame data and previous frame data compares, the data of having determined to change according to comparative result, refresh the buffer memory of display screen according to the described data that changed, realize displaying the play of these frame data; Thereby needn't refresh the whole buffer memory of display screen, saved the time of refreshing display screen in the playing process greatly, also just save the portable terminal processing, shown time of digital television signal, guaranteed other of portable terminal more task handling time, improved the handling property of portable terminal.
Description of drawings
Fig. 1 is the portable terminal internal structure block diagram of prior art;
Fig. 2,3 carries out the method flow diagram that software decode is handled for the embodiment of the invention to every frame CMMB data;
Fig. 4 carries out the method flow diagram of digital television signal decoding for the employing software mode of the embodiment of the invention;
Fig. 5 is the portable terminal internal structure block diagram of the embodiment of the invention;
Fig. 6 is the control module internal structure block diagram of the embodiment of the invention;
Fig. 7 is the processing television signals submodule internal structure block diagram of the embodiment of the invention;
Fig. 8 is the video data processing unit internal structure block diagram of the embodiment of the invention.
Embodiment
Though in the PC of prior art, can realize the decoding of sound, video by software, yet in portable terminal, can not realize adopting software that the digital television signal that receives is decoded easily.Reason is, the system of portable terminal is the software systems of a multitask job, when we are using software decode CMMB (China Mobile Multimedia Broadcasting, China Mobile multimedia broadcasting) data flow the time, need to consider the working condition of mobile terminal system,, do not having influence on the basic communication function of portable terminal when (comprising conversation, data communication) according to the multitask characteristic of portable terminal, realize high-efficiency decoding as far as possible, satisfy and play smooth requirement.Because the basic function of portable terminal comprises the network communication function, promptly portable terminal need periodically obtain the relevant information of wireless network, determines whether that according to acquired information needs search net, switching channels again, whether handle information that network side sends etc.Therefore, when in portable terminal, realizing the data flow of software decode digital television signal, can not have influence on these groundworks of portable terminal.At present, the digital television signal that portable terminal receives mostly is the CMMB data, be that example is told about concrete scheme with software mode decoding processing CMMB data flow below, for the digital television signal of other agreement, those skilled in the art can be according to the easy realization software decode of the disclosed technology contents of the embodiment of the invention.
The portable terminal employing software mode that the embodiment of the invention provides is realized the decoding to digital television signal, thereby replace the hardware audio/video decoder that the prior art portable terminal is adopted, can save the shared space of hardware circuit greatly like this, and the economize on hardware cost.In portable terminal, can be provided with a data handling process cycle (such as the cycle be 1s), in each process cycle with the time of setting (such as setting-up time 750ms) come to the digital television signal that receives carry out sound, the video software decoding obtains media data, and with the video data in the decoded media data by display screen display the play, voice data passes through loudspeaker plays; And in the process cycle remaining At All Other Times in portable terminal can carry out other task (such as with the network side communication) or idle.Because for the communication task of decoding task and portable terminal has all periodically been set the time of implementation, therefore, the basic function that had both guaranteed portable terminal (comprises and the network side communication, obtain, handle the information that wireless network sends, and return relevant information), realized again coming the decoded digital TV signal by software.
In actual application, network environment is often undesirable, and mobile terminal system need frequently be caught net or switching, and perhaps system break occurs in the CMMB playing process at busy may causing, thereby influences user's use.Such as, portable terminal is 30ms (comprising decoding, the time that shows) to the about holding time of each frame CMMB data processing, in order to reach the requirement that displays the play, at least per second need be handled 25 frames, so for the process cycle of 1s, the whole time of handling digital television signal is 25 * 30=750ms, and the 250ms that is left each second is taken or the free time by other tasks of mobile phone.Yet in the time of need frequently catching net or switch in system, the time that may take surpasses 250ms, thereby causes break occurring in the CMMB playing process.
Therefore, the embodiment of the invention is further optimized the handling process to digital television signal: by discovering, handle to comprise the steps for every frame CMMB data, shared time of each step as shown in Figure 2:
S201, receive CMMB data (audio, video data promptly before the decoding, compression) from television receiver unit and need take 2ms.
S202, from the CMMB data, decompose the time that video flowing probably needs 0.5ms that obtains.
S203, video data decoded probably needs the 20ms time.
Behind S204, the decode video data, obtain frame data, frame data are carried out the size scaling computing, make it to be adapted to show that this time probably needs 0.5ms on the display screen of portable terminal.
S205, these frame data are carried out video data format conversion (such as the data that convert rgb format to), probably need the time of 0.5ms.
S206, according to the buffer memory of Refresh Data display screen of the rgb format of conversion, thereby realize display screen display frame data, flush buffers probably needs the 3ms time.
S207, from the CMMB data, decompose the time that audio stream probably needs 0.5ms that obtains.
S208, decoding audio data probably need the time of 3ms.
S209, behind decoding audio data, audio frequency is sent to playback equipment carries out voice playing.
By above-mentioned various processes as can be seen, every processing one frame CMMB data roughly need to take the time of 30ms.
The present inventor finds that refreshing the display screen buffer memory need take the more time (being that step S206 need take the more time), and in fact is not that every frame data all need the entire display screen buffer memory is all refreshed.In fact, if only refresh the part that changes to some extent than the former frame data, can realize correct demonstration to back one frame data.
Flow process after the optimization comprises the steps: as shown in Figure 3
S301, receive CMMB data (audio, video data promptly before the decoding, compression) from television receiver unit and need take 2ms.
S302, from the CMMB data, decompose the time that video flowing probably needs 0.5ms that obtains.
S303, video data decoded probably needs the 20ms time.
Behind S304, the decode video data, obtain frame data, these frame data are carried out estimation; Be about to these frame data and previous frame data and compare, determine these frame data data different (promptly change data) with the previous frame data.The time of estimation is 0.5ms probably.
Method for estimating commonly used can comprise: polygon coupling, integer pixel estimation, INTRA/INTER model selection, the search of half sample, motion vector coding etc., these methods are well known to those skilled in the art, and repeat no more herein.
S305, to the variation determined data carry out the size scaling computing, make it to be adapted to show that this time probably needs 0.5ms on the display screen of portable terminal.
S306, will carry out video data format conversion (such as being converted to the rgb format data), probably need the time of 0.5ms through the data behind the size scaling.
S307, according to the buffer memory of Refresh Data display screen of the rgb format of conversion, thereby realize display screen display frame data.Owing to be not the data that all frame data converted to rgb format in S306, and the data transaction that only is the variation that will determine among the step S305 becomes the data of rgb format, re-use the buffer memory of the Refresh Data display screen of these rgb formats, rather than to the buffer memory of entire display screen refresh (promptly according to the variation of determining data, selectively some buffer memory in the display screen buffer memory write the variation that is converted to rgb format data); Therefore, significantly reduced the average time of flush buffers, probably is the 1ms time.
S308, from the CMMB data, decompose the time that audio stream probably needs 0.5ms that obtains.
S309, decoding audio data probably need the time of 3ms.
S310, behind decoding audio data, audio frequency is sent to playback equipment carries out voice playing.
Like this, can be compressed to 1ms the average time of refreshing display screen, the processing time compression 1.5ms of every frame data, and then the processing time of 25 frame data can shorten 37.5ms; That is to say that the time that portable terminal can be used for carrying out other task (such as catching net or switching) has increased 37.5ms; Thereby improved the performance of portable terminal more,, when portable terminal need frequently be caught net or switching, in the process of televising, also do not had break, further improved user's experience even under relatively poor network environment; And further reduced mobile terminal power consumption.
The employing software mode that the embodiment of the invention provides carries out the concrete grammar of digital television signal decoding, and flow chart comprises the steps: as shown in Figure 4
Whether S401, detection timing cycle arrive, if timing cycle arrival, then execution in step S402.Length those skilled in the art of timing cycle can set according to actual conditions, such as being set at 1s.
S402, pick up counting.
S403, handle frame data according to the digital television signal that receives, the method for specifically handling frame data can be as Fig. 2 or method flow shown in Figure 3.
S404, judge whether timing time arrives setting-up time; If do not have, continue execution in step S403, handle the next frame data, otherwise, execution in step S405.Length those skilled in the art of this setting-up time can set according to actual conditions, such as being set at 713ms.
S405, judge whether to open recording function according to setting; If open, execution in step S406 then, otherwise, execution in step S407.
S406, these frame data (comprising sound, video data) are stored, realized recording digital television signal.In storing process, can also adopt DRM (Digital Rights Management, digital copyright management) technology that data are encrypted, prevent that the content of recording from illegally being propagated.
Because the embodiment of the invention adopts the method for software decode, therefore, can be more easily subsequent operation (such as cryptographic calculation etc.) is handled, done to decoded data than the method for hardware decoding, thereby realize easily recording, other miscellaneous function such as data processing.
S407, handle other task,, determine whether that according to acquired information needs search net, switching channels again, whether handle information that network side sends etc. such as the relevant information of obtaining wireless network.After other task that disposes, jump to step S401.
Though it will be understood by those skilled in the art that in the above-mentioned explanation, for ease of understanding, the step of method has been adopted the succession description, should be pointed out that for the order of above-mentioned steps and do not do strict the restriction.
A kind of portable terminal that the embodiment of the invention provides as shown in Figure 5, comprising: radio-frequency module 501, control module 502, display module 503, audio playing module 504.
Wherein, the 26S Proteasome Structure and Function of radio-frequency module 501, display module 503, audio playing module 504 is the same with respective modules in the prior art portable terminal, no longer gives unnecessary details herein.Compare with the portable terminal of prior art, the portable terminal of the embodiment of the invention has been saved audio/video decoder, and it has realized decoding to audio frequency and video by software mode in control module 502:
Control module 502 is used in the very first time of each clock cycle section, to carry out sound, video software decoding from the digital television signal that radio-frequency module 501 receives, and decoded sound, video data will be play by audio playing module 504, display module 503 respectively; In second time period of described clock cycle, control module 502 is carried out communication with network side.The time span sum of the very first time section and second time period is less than or equal to the clock cycle.If control module 502 after finishing with the network side communication of task, also has remaining time in the clock cycle, then control module 502 can be idle, perhaps handles other task.Control module 502 specifically can comprise CPU (Center Process Unit, CPU) and memory, and CPU (being processor) can adopt the QSC5055 chip of QUALCOMM.The television receiver unit of radio-frequency module 501 can transmit the digital television signal that receives to control module 502 by bus modes such as SPI or I2C.
A kind of concrete internal structure block diagram of control module 502 can comprise as shown in Figure 6: cycle monitoring submodule 601, processing television signals submodule 602, communication task processing sub 603.
Wherein, cycle monitoring submodule 601 is used for when each clock cycle arrives, and sends to processing television signals submodule 602 and handles notice.
The processing notice that processing television signals submodule 602 sends according to cycle monitoring submodule 601, to carry out sound, video software decoding from the digital television signal that radio-frequency module 501 receives, and decoded sound, video data will be play by audio playing module 504, display module 503 respectively.The processing television signals submodule 602 concrete methods of handling digital television signal can adopt as Fig. 2 or method shown in Figure 3.
Communication task processing sub 603 is carried out communication according to the notice and the network side of cycle monitoring submodule 601.
A kind of concrete internal structure block diagram of processing television signals submodule 602 as shown in Figure 7, comprising: Data Receiving unit 701, voice data processing unit 702, video data processing unit 703.
Video data processing unit 703 is play by described display module after being used for described video data carried out decoding processing;
Voice data processing unit 702 is play by described audio playing module after being used for described voice data carried out decoding processing.
As shown in Figure 8, video data processing unit 703 specifically comprises: video data decoding subelement 801, estimation subelement 802, data conversion subelement 803, demonstration refresh subelement 804.
Video data decoding subelement 801 is used for described video data is decoded;
Estimation subelement 802 is used for for the video data behind each frame decoding, these frame data and previous frame data is compared the data of having determined to change according to comparative result;
Data conversion subelement 803 be used for variation that estimation subelement 802 is determined data carry out size scaling, video data format conversion;
Show that refresh subelement 804 is used for that data conversion subelement 803 is carried out data after the video data format conversion and is written to the display screen buffer memory and refreshes demonstration.
The portable terminal of the embodiment of the invention is owing to come the digital television signal that receives is carried out sound, video software decoding with the time of setting (such as setting-up time 750ms) in each process cycle, and decoded video data displayed the play by display screen, remainingly in the process cycle then carry out other task or free time At All Other Times by portable terminal; For other task of decoding task and portable terminal has all periodically been set the time of implementation, therefore, both guaranteed the basic function (comprise and obtain, handle the information that wireless network sends, and return relevant information) of portable terminal, and realized again coming the decoded digital TV signal by software; Thereby saved the audio/video decoder of hardware, made portable terminal when realizing playing digital television signal, to have reached the purpose of saving the portable terminal inner space, reducing the portable terminal hardware cost.
Further, owing in the process that decoded video data is play, adopted the method for estimation, being about to current frame data and previous frame data compares, the data of having determined to change according to comparative result, according to stating the buffer memory that the data that changed refresh display screen, realize displaying the play of these frame data; Thereby needn't refresh the whole buffer memory of display screen, saved the time of refreshing display screen in the playing process greatly, also just save the portable terminal processing, shown time of digital television signal, guarantee other task handling time of portable terminal more.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, this program can be stored in the computer read/write memory medium, as: ROM/RAM, magnetic disc, CD etc.
Will also be appreciated that the apparatus structure shown in accompanying drawing or the embodiment only is schematically, the presentation logic structure.Wherein the module that shows as separating component may or may not be physically to separate, and the parts that show as module may be or may not be physical modules, both can be positioned at a place, also can be distributed on several network element.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1, a kind of method of mobile terminal playing digital television signal is characterized in that, comprising:
In the very first time of each clock cycle section, portable terminal carries out software decode to the digital television signal that receives, and decoded media data is play;
In second time period of described clock cycle, described portable terminal and network side carry out communication.
2, the method for claim 1 is characterized in that, described media data comprises video data, and the video data in the decoded media data is play, and specifically comprises:
For the video data behind each frame decoding, these frame data and previous frame data are compared the data of having determined to change according to comparative result;
After the described data of determining that changed are carried out computing and Data Format Transform, be written in the buffer memory of display screen and refresh demonstration.
3, method as claimed in claim 2 is characterized in that, described data format comprises: the RGB data format.
4, the method for claim 1 is characterized in that, described portable terminal also comprises after the digital television signal that receives is carried out software decode:
Decoded media data is stored, realize recording digital television signal.
5, method as claimed in claim 4 is characterized in that, in the process that digital television signal is recorded, adopts digital copyright management DRM technology that the content of recording is encrypted.
6, a kind of portable terminal comprises: radio-frequency module, display module and audio playing module, it is characterized in that, and also comprise:
Control module, be used in the very first time of each clock cycle section, to carry out software decode from the digital television signal that described radio-frequency module receives, and decoded voice data and video data will be play by described audio playing module, display module respectively; In second time period of described clock cycle, carry out communication with network side.
7, terminal as claimed in claim 6 is characterized in that, described control module comprises:
The cycle monitoring submodule is used for when each clock cycle arrives, and sends first and handles notice; When determining that described very first time section arrives, send first expiry notification, and send the second processing notice;
The processing television signals submodule, be used for handling notice according to described first, to carry out software decode from the digital television signal that described radio-frequency module receives, and decoded voice data and video data will be play by described audio playing module, display module respectively; And when receiving described first expiry notification, stop processing to digital television signal;
The communication task processing sub is used for carrying out communication receiving described second when handling notice with network side.
8, terminal as claimed in claim 7 is characterized in that, described processing television signals submodule comprises:
The Data Receiving unit is used for receiving described first when handling notice, and the digital television signal according to receiving from described radio-frequency module decomposites voice data and video data; When receiving described first expiry notification, stop decomposition to digital television signal;
The video data processing unit after being used for described video data carried out decoding processing, is play by described display module;
The voice data processing unit after being used for described voice data carried out decoding processing, is play by described audio playing module.
9, terminal as claimed in claim 8 is characterized in that, described video data processing unit comprises:
The video data decoding subelement is used for described video data is decoded;
The estimation subelement is used for for the video data behind each frame decoding, these frame data and previous frame data compared the data of having determined to change according to comparative result;
The data conversion subelement, be used for variation that described estimation subelement is determined data carry out computing and Data Format Transform;
Show and to refresh subelement, be used for that described data conversion subelement is carried out data after the video data format conversion and be written to the display screen buffer memory and refresh demonstration.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910005680A CN101494744B (en) | 2009-02-16 | 2009-02-16 | Mobile terminal and method for playing digital television signal |
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| CN200910005680A CN101494744B (en) | 2009-02-16 | 2009-02-16 | Mobile terminal and method for playing digital television signal |
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| CN101494744A true CN101494744A (en) | 2009-07-29 |
| CN101494744B CN101494744B (en) | 2012-09-12 |
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Granted publication date: 20120912 Termination date: 20200216 |