CN102892037A - CMMB (China mobile multimedia broadcasting) terminal receiving method and device - Google Patents
CMMB (China mobile multimedia broadcasting) terminal receiving method and device Download PDFInfo
- Publication number
- CN102892037A CN102892037A CN2011102072759A CN201110207275A CN102892037A CN 102892037 A CN102892037 A CN 102892037A CN 2011102072759 A CN2011102072759 A CN 2011102072759A CN 201110207275 A CN201110207275 A CN 201110207275A CN 102892037 A CN102892037 A CN 102892037A
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- frequency
- available frequency
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- broadcast program
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/414—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
- H04N21/41407—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance embedded in a portable device, e.g. video client on a mobile phone, PDA, laptop
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/26—Arrangements for switching distribution systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
- H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
- H04N21/4263—Internal components of the client ; Characteristics thereof for processing the incoming bitstream involving specific tuning arrangements, e.g. two tuners
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- General Engineering & Computer Science (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
The invention relates to and provides a CMMB (China mobile multimedia broadcasting) terminal receiving method which comprises the steps of searching for available frequency points when a CMMB terminal plays normally; and when receiving performance parameters of the playing program frequency points are less than the receiving performance parameters of the available frequency points, switching the frequency points of the playing program to the searched available frequency points by the CMMB terminal. The invention also provides a CMMB terminal receiving device. By adopting the scheme, the function is realized by mainly utilizing software programming in a CMMB chip, and additional hardware is not required to be added; and the CMMB terminal can always work at the frequency point with the best receiving performance, and the optimal playing is realized.
Description
Technical field
The present invention relates to moving communicating field, relate to especially a kind of CMMB (China Mobile Multimedia Broadcasting, China Mobile multimedia broadcasting) terminal method of reseptance and device.
Background technology
CMMB is mainly towards hand held terminal unit, its end product kind comprises that mainly MP4, mobile phone, GPS, USB receive rod, independent receivers etc., digital broadcast television program, integrated information and urgent broadcast service are provided, realize the seamless collaborative covering that satellite transmission combines with ground network.CMMB adopts has the mobile multimedia broadcast television technology, system can run, can safeguard, can manage, possess broadcast type, reversible service function, support the transportation that central and local governments combine, possesses encryption authorization control and management system, support unified standard and unified operation, support the roaming of the user whole nation.
CMMB ground base station U wave band requires band limits 474-798Mhz.Great majority support its reception frequency of city of CMMB to only have one in this scope, but present more and more universal along with the CMMB handheld terminal in flourishing cities such as Beijing, Shanghai, the CMMB in these cities receives more than one of frequency, such as Beijing three frequencies is arranged at present.For these city of multifrequency point is arranged, the CMMB hand held terminal unit can only lock at the beginning a signal strength signal intensity preferably frequency receive, but switch with landing pit, the signal strength signal intensity of different regions frequency can change, this moment is because the locking of frequency, the CMMB hand held terminal unit can only keep original frequency to play, if this moment, this frequency was very weak at this regional signal, may terminal just can't play or play discontinuous this moment for the user, defective that current regional multifrequency point CMMB exists that Here it is has not been given play to the advantage of regional multifrequency point CMMB fully.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of CMMB terminal method of reseptance and device, can't automatically carry out the problem that frequency switches to solve in the CMMB terminal.
For addressing the above problem, the invention provides a kind of CMMB terminal method of reseptance, comprise,
When CMMB terminal normal play, search for available frequency;
When the receptivity parameter of described broadcast program frequency was worse than the receptivity parameter of available frequency, described CMMB terminal switched to the described available frequency that searches with the frequency of described broadcast program.
Further, before the available frequency of search,
Described CMMB terminal is judged the signal performance parameter of described broadcast program frequency, determines to start the described available frequency of search.
Further, search for available frequency after,
The receptivity parameter of more described available frequency and CMMB terminal are just in the receptivity parameter of broadcast program frequency.
Further, when the receptivity parameter of described broadcast program frequency is worse than the receptivity parameter of available frequency, also comprise,
Provide to the user and to carry out switch prompting, according to user's switching indication the frequency of described broadcast program is switched to the described available frequency that searches.
Further, after searching described available frequency, preserve the receptivity parameter of described available frequency.
In the above-mentioned method, wherein, described CMMB terminal is judged the signal performance parameter of described broadcast program frequency, determine to start the described available frequency of search and be specially,
If in a special time period, just when the signal performance parameter of broadcast program frequency surpasses the particular job value, then determine to start the described available frequency of search.
The present invention also provides a kind of CMMB terminal receiving system, comprises,
Search module is used for searching for available frequency when CMMB terminal normal play;
Control module is used for when the receptivity parameter of described broadcast program frequency is worse than the receptivity parameter of available frequency, and the frequency of described CMMB terminal plays program is switched to the described available frequency that searches.
Further, also comprise,
Judge the beginning module, be used for judging the signal performance parameter of described broadcast program frequency, determine to start the available frequency of the described CMMB terminal of search.
Further, also comprise,
The contrast module is used for the receptivity parameter of more described available frequency and CMMB terminal just in the receptivity parameter of broadcast program frequency.
Further, also comprise,
Reminding module carries out switch prompting for providing to the user;
Described control module is used for indicating the frequency with described broadcast program to switch to the described available frequency that searches according to user's switching.
Further, also comprise,
Preserve module, be used for after searching described available frequency, preserving the receptivity parameter of described available frequency.
Adopting technical scheme of the present invention, mainly is to utilize software programming to realize this function at the CMMB chip internal, does not need to increase extra hardware; And can make the CMMB terminal be operated in the best frequency of receptivity always, realize optimum the broadcast.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of a part of the present invention, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is a kind of CMMB terminal structure figure;
Fig. 2 is the first embodiment of the invention structure chart;
Fig. 3 is the second embodiment of the invention flow chart.
Embodiment
In order to make technical problem to be solved by this invention, technical scheme and beneficial effect clearer, clear, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, be a kind of CMMB terminal structure figure, comprise the CMMB chip, described CMMB chip comprises tuner, control module, switch control module, described control module comprises demodulator and host CPU, wherein,
The CMMB terminal antenna receives the CMMB signal in the space, radio frequency matching circuit and the band pass filter outer by the CMMB chip increase frequency range, improve receptivity, then enter into the tuner of CMMB chip internal by the radio frequency end of CMMB chip, process low noise amplifier LNA in tuner, mixing, DC proofreaies and correct, after amplifying, low-pass filtering and gain give demodulator, demodulator is demodulation chip, it receives the zero intermediate frequency signals of self-tuner, through behind the channel demodulation and forward error correction of demodulator, the transmission TS stream that forms reference format is given host CPU decoding reduction; Read the receptivity index by demodulator simultaneously, these indexs are fed back to switch control module judge, choose optimum frequency by switch control module and carry out the locked frequency point broadcast.Begin normal play to this CMMB chip with regard to having chosen suitable frequency.
Particularly, the built-in programmable Digital Signal Processing DSP hardware system of demodulator, have multiple interfaces function (USB, secure digital input and output SDIO, serial peripheral equipment interface SPI and BUS bus), and built-in multi-protocol packaging forward error correction MPE-FEC internal memory.Demodulator is by the control of I2C (Inter-Integrated Circuit) bus realization to tuner.Demodulator processes is come the differential signal of the similar IQ of self-tuner, reconciling into standard TS stream gives host CPU decoding reduction and reads the power level value that hope obtains, snr value SNR, ber value BER feeds back to switch control module and judges by reading receptivity index host CPU.
As shown in Figure 2, be the first embodiment of the invention structure chart, a kind of CMMB terminal receiving system is provided, be arranged in the CMMB chip, comprise,
Judge beginning module 202, be used for determining whether to start search module according to the signal performance parameter;
Particularly, with signal to noise ratio as the signal performance parameter, if when the value of signal to noise ratio in a set time section during always more than or equal to particular job value (being assumed to be 4), judge that the beginning module thinks that the receptivity index of frequency this moment meets the demands, and does not start search module search; When in a set time section, just remain on less than 4 the time in the signal to noise ratio of broadcast program frequency always, judge that the beginning module just allows search module start working.
Particularly, search module is searched near the available frequency its terminal, and with the receptivity parameter of these frequencies, such as receiving sensitivity, signal to noise ratio etc. are stored among the RAM of CMMB chip self;
Reminding module 206, just when the frequency receptivity parameter of broadcast program is worse than the receptivity parameter of the available frequency that searches, be used for to carry out switch prompting according to the order of control module at user interface, the user can select to switch or keep according to prompting, if the user agrees to switch, then send handover information to control module;
Particularly, the receptivity parameter of locked frequency point is worse than the receptivity parameter that searches frequency among the RAM, then is transformed into reminding module this moment, information can be presented at user's current operation interface, whether the inquiry user switches, if choosing is then to send handover information to control module; If select noly, then send maintenance information to control module.
As shown in Figure 3, be the second embodiment of the invention flow chart, a kind of CMMB terminal method of reseptance be provided, comprise,
Step S301 when CMMB terminal normal play is worked, determines whether to start the available frequency of search according to the signal performance parameter of current broadcast frequency;
Particularly, with signal to noise ratio as the signal performance parameter, if when the value of signal to noise ratio in a set time section always more than or equal to particular job value (being made as 4 herein), think that the receptivity index of frequency this moment meets the demands, do not start the available frequency of search; When in a set time section just the signal to noise ratio at the broadcast program frequency remain on less than 4 always, start the available frequency of search.
Step S302, the CMMB terminal is near the available frequency of the interior search terminal recipient of section at a fixed time, if search available frequency, the receptivity parameter of these available frequencies is saved in the RAM of CMMB inside;
Particularly, near the available frequency its terminal of CMMB terminal searching, and with the receptivity parameter of these frequencies, such as receiving sensitivity, signal to noise ratio etc. are stored among the RAM of CMMB chip self and go;
Step S303, after search is complete, with the receptivity parameter of the available frequency that collects in the search module and at present terminal just compare in the frequency receptivity parameter of broadcast program, obtain comparative result;
Particularly, described comparative result just comprises the receptivity parameter of the available frequency that the frequency receptivity parameter at broadcast program is better than searching, and perhaps is worse than the receptivity parameter of the available frequency that searches in the frequency receptivity parameter of broadcast program.
Step S304, c
The receptivity parameter of locked frequency point is worse than the receptivity parameter that searches frequency among the RAM, and then this moment, information can be presented at user's current operation interface, and whether the inquiry user switches, if choosing is then to send handover information; If select noly, then send maintenance information.
Step S305 according to the feedback message that receives, if switch message, then switches to the frequency that searches, if keep message, then the CMMB chip frequency that will continue to keep original is play.
Above-mentioned explanation illustrates and has described the preferred embodiments of the present invention, but as previously mentioned, be to be understood that the present invention is not limited to the disclosed form of this paper, should not regard the eliminating to other embodiment as, and can be used for various other combinations, modification and environment, and can in invention contemplated scope described herein, change by technology or the knowledge of above-mentioned instruction or association area.And the change that those skilled in the art carry out and variation do not break away from the spirit and scope of the present invention, then all should be in the protection range of claims of the present invention.
Claims (11)
1. a CMMB terminal method of reseptance is characterized in that, described method comprises,
When CMMB terminal normal play, search for available frequency;
When the receptivity parameter of described broadcast program frequency was worse than the receptivity parameter of available frequency, described CMMB terminal switched to the described available frequency that searches with the frequency of described broadcast program.
2. method according to claim 1 is characterized in that, before the available frequency of search,
Described CMMB terminal is judged the signal performance parameter of described broadcast program frequency, determines to start the described available frequency of search.
3. method according to claim 2 is characterized in that, search for available frequency after,
The receptivity parameter of more described available frequency and CMMB terminal are just in the receptivity parameter of broadcast program frequency.
4. method according to claim 3 is characterized in that, when the receptivity parameter of described broadcast program frequency is worse than the receptivity parameter of available frequency, also comprise,
Provide to the user and to carry out switch prompting, according to user's switching indication the frequency of described broadcast program is switched to the described available frequency that searches.
5. according to claim 1 to 4 arbitrary described methods, it is characterized in that, after searching described available frequency, preserve the receptivity parameter of described available frequency.
6. according to claim 2 to 4 arbitrary described methods, it is characterized in that described CMMB terminal is judged the signal performance parameter of described broadcast program frequency, determine to start the described available frequency of search and be specially,
If in a special time period, just when the signal performance parameter of broadcast program frequency surpasses the particular job value, then determine to start the described available frequency of search.
7. a CMMB terminal receiving system is characterized in that, comprise,
Search module is used for searching for available frequency when CMMB terminal normal play;
Control module is used for when the receptivity parameter of described broadcast program frequency is worse than the receptivity parameter of available frequency, and the frequency of described CMMB terminal plays program is switched to the described available frequency that searches.
8. device according to claim 7 is characterized in that, also comprise,
Judge the beginning module, be used for judging the signal performance parameter of described broadcast program frequency, determine to start the available frequency of the described CMMB terminal of search.
9. device according to claim 8 is characterized in that, also comprise,
The contrast module is used for the receptivity parameter of more described available frequency and CMMB terminal just in the receptivity parameter of broadcast program frequency.
10. device according to claim 9 is characterized in that, also comprise,
Reminding module carries out switch prompting for providing to the user;
Described control module is used for indicating the frequency with described broadcast program to switch to the described available frequency that searches according to user's switching.
11. device according to claim 10 also comprises,
Preserve module, be used for after searching described available frequency, preserving the receptivity parameter of described available frequency.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102072759A CN102892037A (en) | 2011-07-22 | 2011-07-22 | CMMB (China mobile multimedia broadcasting) terminal receiving method and device |
| PCT/CN2011/083966 WO2012151992A1 (en) | 2011-07-22 | 2011-12-14 | Reception method and device for cmmb terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102072759A CN102892037A (en) | 2011-07-22 | 2011-07-22 | CMMB (China mobile multimedia broadcasting) terminal receiving method and device |
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| CN102892037A true CN102892037A (en) | 2013-01-23 |
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| CN2011102072759A Pending CN102892037A (en) | 2011-07-22 | 2011-07-22 | CMMB (China mobile multimedia broadcasting) terminal receiving method and device |
Country Status (2)
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| CN (1) | CN102892037A (en) |
| WO (1) | WO2012151992A1 (en) |
Cited By (1)
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| CN115801030A (en) * | 2022-10-13 | 2023-03-14 | 成都老鹰信息技术有限公司 | Carrier automatic searching system and searching method thereof |
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- 2011-07-22 CN CN2011102072759A patent/CN102892037A/en active Pending
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| CN1318940A (en) * | 2000-04-17 | 2001-10-24 | 周超 | Intelligent TV receiving system |
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| WO2012151992A1 (en) | 2012-11-15 |
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