CN101959036A - Method and device for calibrating local time - Google Patents
Method and device for calibrating local time Download PDFInfo
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- CN101959036A CN101959036A CN2009101501891A CN200910150189A CN101959036A CN 101959036 A CN101959036 A CN 101959036A CN 2009101501891 A CN2009101501891 A CN 2009101501891A CN 200910150189 A CN200910150189 A CN 200910150189A CN 101959036 A CN101959036 A CN 101959036A
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Abstract
The invention provides a method and a device for calibrating local time. The method comprises the following steps of receiving CMMB (China Mobile Multimedia Broadcasting) signal data; analyzing the CMMB signal data and extracting date and the time information from the CMMB signal data; and calibrating the local time by taking the date and the time information as time standard. The invention can ensure that the terminal with the CMMB function can automatically calibrate the local time with high precision by receiving the CMMB signal data, analyzing the CMMB signal data, extracting the time information of the CMMB signal data and taking the time information as the basis for calibrating the local time; the extra cost for adding a GPS (Global Positioning System) receiving module can be avoided.
Description
Technical field
The invention relates to the communications field, particularly about a kind of local zone time calibration steps and device.
Background technology
At present, (China Mobile Multimedia Broadcasting, CMMB) system just promotes China Mobile multimedia broadcasting fast at home.CMMB is the system of first cover of domestic independent research towards mobile phone, PDA, MP3, MP4, digital camera, the multiple portable terminal of notebook computer, utilize the S-band signal to realize that " world " one covers, whole nation roaming, it can provide multimedia services such as video, audio frequency, data for various portable terminals.On October 24th, 2006, SARFT(The State Administration of Radio and Television) has formally issued the CMMB industry standard, determines to adopt the Mobile Multimedia Broadcasting industry standard of China's independent research.Just because of the fast development of CMMB, increasing terminal begins to support the CMMB function, has added the CMMB functional module.
The local zone time calibration of terminal can comprise manual calibration and calibration automatically, and manual calibration is that most portable terminals all possess, but its complex operation and precision are not high; Automatically the present great majority of calibration all are to adopt global positioning system (GPS does not have local time offset for Global Position System, GPS) time service, and the positioning accuracy height is affected by environment little, and it is very high to adopt the GPS time service to carry out the local zone time calibration accuracy.The signal transmitting terminal of above-mentioned CMMB system has also adopted the GPS time service, and has comprised precise time information in the CMMB of its emission signal.
But the receiving terminal of the existing CMMB of having function has only minority to have the GPS receiver module, if come the alignment time and add the GPS receiver module in order to carry out the GPS time service, will inevitably cause the increase of extra cost.
Summary of the invention
The embodiment of the invention provides a kind of local zone time calibration steps and device, be used to the terminal with CMMB function by reception CMMB signal, and the temporal information of obtaining wherein realizes high-precision local zone time calibration.
The embodiment of the invention has proposed a kind of local zone time calibration steps, and this method comprises: receive China Mobile multimedia broadcasting CMMB signal data; Resolve described CMMB signal data and extract date and time information in the described CMMB signal data; Described date and time information is calibrated local zone time as time reference.
The embodiment of the invention has also proposed a kind of local zone time calibrating installation, and this device comprises: receiving element is used to receive China Mobile multimedia broadcasting CMMB signal data; Resolve extraction unit, the date and time information that is used for resolving described CMMB signal data and extracts described CMMB signal data; Time calibration, the unit was calibrated as time reference described date and time information to local zone time.
The embodiment of the invention is by receiving the CMMB signal data, resolving this CMMB signal data and extraction date and time information wherein, with the basis of this date and time information as the local zone time calibration, thereby not only make terminal can carry out high-precision local zone time calibration automatically, also avoided adding the extra cost that the GPS receiver module is brought with CMMB function.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The flow chart of a kind of local zone time calibration steps that Fig. 1 provides for the embodiment of the invention one;
Time slot allocation and multiplexed frame structural representation in a kind of CMMB system that Fig. 2 provides for the embodiment of the invention one;
The flow chart of a kind of local zone time calibration steps that Fig. 3 provides for the embodiment of the invention two;
The flow chart of a kind of local zone time calibration steps that Fig. 4 provides for the embodiment of the invention three;
The flow chart of a kind of local zone time calibration steps that Fig. 5 provides for the embodiment of the invention four;
The structural representation of a kind of local zone time calibrating installation that Fig. 6 provides for the embodiment of the invention five;
The structural representation of a kind of local zone time calibrating installation that Fig. 7 provides for the embodiment of the invention six.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Embodiment one
Be illustrated in figure 1 as the flow chart of a kind of local zone time calibration steps that the embodiment of the invention one provides, this method comprises the steps:
S101: receive China Mobile multimedia broadcasting CMMB signal data.The embodiment of the invention is the technical scheme that proposes at the terminal with CMMB function, and specifically, this step is to be finished by the CMMB receiver module in the terminal.Above-mentioned terminal receives the CMMB signal data that sends from CMMB system transmitting terminal by the CMMB receiver module, this CMMB signal data can be transmitted via satellite and receive, perhaps direct forwarding by ground station receives, and can certainly be the CMMB signal data that directly receives the transmitting terminal emission of CMMB system.In the present embodiment, do not limit by which kind of approach and receive this CMMB signal data.
S102: resolve described CMMB signal data and extract date and time information in the described CMMB signal data.In order to realize this step, we need understand the data structure of CMMB signal, determine the position of date and time information in the CMMB signal.
The physical layer signal of CMMB was 1 frame in per 1 second, and every frame is divided into 40 time slots, and the length of each time slot is 25ms.The physical layer signal of CMMB comprises control logic channel and service logical channels, and wherein the control logic channel has only one, and its 0th time slot that takies system sends; Service logical channels is by system configuration, and service logical channels can be 1～39 in every frame CMMB physical layer signal, and each service logical channels takies an integer time slot.
Time slot allocation and multiplexed frame structural representation in a kind of CMMB system that is illustrated in figure 2 as that the embodiment of the invention one provides.As can be seen from Fig. 2, in the CMMB system every frame physical layer signal include 1 control logic channel (Control Logical Channel, CLCH) and several service logical channels (Serves Logical Channel, SLCH).In some broadcast channel frame k (when accounting for 1 second), be divided into 40 time slots, each time slot duration is 25 milliseconds, and wherein time slot 0 is fixing is taken by CLCH, and other time slot is SLCH.
Comprise several multiplexed frames in each broadcast channel frame again, as multiplexed frame 0～multiplexed frame n (n＜40) among Fig. 2.Wherein multiplexed frame 0 uses time slot 0, and this frame is control information; Each multiplexed frame is made up of multiplex frame head, multiplexed frame payload, filling; The multiplexed frame payload is made up of several multiplexed sub frames, as the multiplexed sub frame 1～multiplexed sub frame n among Fig. 2.
For multiplexed frame 0 (MF_ID==0), the multiplexed sub frame correspondence in its multiplexed frame payload several control information tables, as control information table 1 among Fig. 2～control information table n.Control information table use table identification number identifies, and wherein shows identification number 0x01 and represents that (Network Information Table NIT), represents the system time of CMMB to network information table with 40 bit fields in this table.The step S102 of the embodiment of the invention finds this NIT table and extraction system date and time information wherein by resolving the CMMB signal data just.
S103: described date and time information is calibrated local zone time as time reference.The CMMB system date and time information of extracting among the step S102 is the binary code that is made of 40 fields, need be converted into the benchmark that date and time just can be used as the local zone time calibration to this.Preceding 16 bit representation Modified Julian Date (MJD) date codes of above-mentioned 40 binary codes; 24 of backs are the timing codes of encoding according to BCD, can convert the time that 6 decimal numbers represent to be accurate to second to.
For 24 BCD code conversion is that temporal information is fairly simple, as long as change accordingly according to its corresponding BCD type of coding, has just repeated no more at this.The method that 16 MJD date codes is converted to the date below is described, can described MJD date code be converted to the date according to following formula in the present embodiment:
Y’＝int[(MJD-15078.2)/365.25；
M’＝int{[MJD-14956.1-int(Y’*365.25)]/30.6001}；
D＝MJD-14956-int(Y’*365.25)-int(M’*30.6001)；
K: if M '==14 or M '==15, K=1 so; Otherwise K=0;
Y＝Y’+K ；
M＝M’-1-K*12；
Wherein, Y is year, and M is the moon, and D is day; Such as, if be 1,011 0,000 1,010 0010 o'clock through resolving the MJD date code extract, this moment MJD=45218, the above-mentioned formula of its substitution is obtained:
Y’＝int[(45218-15078.2)/365.25]＝82；
M’＝int{[45218-14956.1-int(82*365.25)]/30.6001}；
＝int{[45218-14956.1-29950.5]/30.6001}；
＝10；
D＝45218-14956-int(82*365.25)-int(10*30.6001)＝45218-14956
-29950-306＝6；
Because M '=10, then K=0;
Y=Y '+K=Y '+0=82, then the time is nineteen eighty-two;
M=M '-1-0*12=10-1-0=9, then month is September;
D=6, then the date is 6;
Thus, we can know that this CMMB system time is September 6 nineteen eighty-two.
After the process aforementioned calculation obtains date and time, just can calibrate local zone time as benchmark with this date and time.
The embodiment of the invention is by receiving the CMMB signal data, resolving this CMMB signal data and extraction date and time information wherein, with the foundation of this date and time information as the local zone time calibration, thereby not only make terminal can carry out high-precision local zone time calibration automatically, also avoided adding the extra cost that the GPS receiver module is brought with CMMB function.
Embodiment two
Be illustrated in figure 3 as the flow chart of a kind of local zone time calibration steps that the embodiment of the invention two provides, this method comprises the steps:
S301: judge whether the CMMB receiver module starts,, then start this CMMB receiver module and enter step S302 if do not start; If start, then directly enter step S302.Described in embodiment one, the embodiment of the invention receives the CMMB signal data is undertaken by the CMMB receiver module, therefore at first needs to start the CMMB receiver module, and said here startup comprises enabling, activating or the CMMB module that resets.
S302: utilize the CMMB receiver module to receive China Mobile multimedia broadcasting CMMB signal data, the CMMB signal data that the CMMB receiver module receives in the present embodiment, both comprised the CMMB signal data of directly transmitting, also comprised the CMMB signal data of directly transmitting from supplement translator from synchronous satellite.
S303: resolve above-mentioned CMMB signal data and extract date and time information in the above-mentioned CMMB signal data.According to the description of step S102 among the embodiment one, only need find the NIT table in the CMMB signal data here, and extract the system time field that wherein constitutes and get final product by 40 bit binary number.
S304: above-mentioned date and time information is calibrated local zone time as time reference.For with described date and time information as time reference, must be date and time with this date and time information translation earlier, this transfer process has just no longer been given unnecessary details at this with step S103 among the embodiment one.
In the present embodiment, can have following two kinds of basic modes that local zone time is calibrated:
Mode one: be the very first time at first with above-mentioned date and time information translation, obtain the difference of this very first time and local zone time, if this very first time is more Zao than local zone time, then calculate the poor of local zone time value and above-mentioned difference, if this very first time is more late than local zone time, then calculate local zone time and above-mentioned difference and, and replace described local zone time with result of calculation.Such as, the very first time in the CMMB system that obtains after the process conversion is 13: 24: 45 on the 8th May in 2009, corresponding simultaneously local zone time is 13: 23: 24 on the 8th May in 2009, then noted difference 1 minute and 21 seconds, when the user need calibrate local zone time, because this very first time is more late than local zone time, therefore only need local zone time is added that this difference can realize the calibration of local zone time.
Mode two: with above-mentioned date and time information translation is the very first time, replaces local zone time and preserves with this very first time.In this manner, the date and time information translation is very first time and to replace local zone time with this be without interruption in sequence very first time, replaces local zone time with this very first time immediately after promptly finishing conversion, to keep as far as possible little time error.
It is pointed out that the embodiment of the invention does not limit in the above described manner calibrates local zone time, and any scheme of calibrating local zone time with time system in the CMMB signal all should fall within protection scope of the present invention.
The embodiment of the invention is by receiving the CMMB signal data, resolving this CMMB signal data and extraction date and time information wherein, with the benchmark of this date and time information as the local zone time calibration, thereby not only make terminal can carry out high-precision local zone time calibration automatically with CMMB function, also avoided adding the extra cost that the GPS receiver module is brought, in addition, various calibrating mode has enriched the local zone time Calibration Method.
Embodiment three
Be illustrated in figure 4 as the flow chart of a kind of local zone time calibration steps that the embodiment of the invention three provides, this method comprises the steps:
S401: judge whether the CMMB receiver module starts,, then start this CMMB receiver module and enter step S402 if do not start; If start, then directly enter step S402.
S402: utilize the CMMB receiver module to receive China Mobile multimedia broadcasting CMMB signal data, the CMMB signal data that the CMMB receiver module receives in the present embodiment, both comprised the CMMB signal data of directly transmitting, also comprised the CMMB signal data of directly transmitting from supplement translator from synchronous satellite.
S403: determine whether that according to the calibration strategy of setting needs carry out the local zone time calibration, if desired, then enter step S404, if do not need, then calibration finishes.
As one embodiment of the present of invention, above-mentioned calibration strategy can comprise: calibrate strategy or timing alignment strategy immediately, wherein, calibrating strategy immediately is meant immediately local zone time is calibrated, and the timing alignment strategy is to calibrate according to the type of calibration and the time that pre-set, can be " start is calibration automatically ", " calibrate once weekly, the time is the 12:30:00 of Monday ", " calibrate once every day, time 12:30:00 " etc. such as type.
Therefore above-mentioned steps S403 also can be specially: under the situation of described calibration strategy, receive calibration command immediately for the described strategy of calibration immediately, according to this immediately calibration command determine that needs carry out the local zone time calibration; Be under the situation of described timing alignment strategy perhaps, determine that according to the time of described timing alignment strategy setting needs carry out the local zone time calibration at described calibration strategy.
S404: resolve above-mentioned CMMB signal data and extract date and time information in the above-mentioned CMMB signal data.
S405: above-mentioned date and time information is calibrated local zone time as time reference.
As one embodiment of the present of invention, still can come local zone time is calibrated by multiple calibrating mode, such as: be the very first time at first with above-mentioned date and time information translation, obtain the difference of this very first time and local zone time, if this very first time is more Zao than local zone time, then calculate the poor of local zone time value and above-mentioned difference, if this very first time is more late than local zone time, then calculate local zone time and above-mentioned difference and, and replace described local zone time with result of calculation; Perhaps, be the very first time with above-mentioned date and time information translation, replace local zone time and preserve with this very first time.
As one embodiment of the present of invention, the standard that the very first time that aforementioned calculation obtains and the difference of local zone time can store as the follow-up time calibration is used, in this case, no matter step S403: adopt which kind of strategy, can no longer resolve above-mentioned CMMB signal data and extract date and time information in the above-mentioned CMMB signal data, but directly utilize the difference information and the local zone time of storage to calculate the alignment time, can realize the calibration of local zone time with this alignment time replacement local zone time.
The embodiment of the invention is by receiving the CMMB signal data, resolving this CMMB signal data and extraction date and time information wherein, with the benchmark of this date and time information as the local zone time calibration, thereby not only make terminal can carry out high-precision local zone time calibration automatically with CMMB function, also avoided adding the extra cost that the GPS receiver module is brought, in addition, various calibrating mode and calibration strategy have also enriched the local zone time Calibration Method.
Embodiment four
Present embodiment is to be that example is further detailed the foregoing description with a video terminal.Be illustrated in figure 5 as the flow chart of a kind of local zone time calibration steps that the embodiment of the invention four provides, this method comprises the steps:
S501: this video terminal startup CMMB receiver module and download configuration information are with the described CMMB receiver module of initialization.
S502: the frequency at search CMMB signal data place also locks described frequency.Because different city, the whole nation may use different frequencies to carry out the broadcast of CMMB programme signal, and same city also might use different frequencies to carry out the broadcast of CMMB programme signal, therefore just need search for, and lock the user and wish the frequency watched various broadcast frequencies.
S503: receive the CMMB signal data, and determine whether that according to the calibration strategy of setting needs carry out the local zone time calibration, if desired, then enter step S504, if do not need, then calibration finishes.The calibration strategy here can be divided into calibrates strategy or timing alignment strategy immediately:
Calibrating strategy immediately is meant immediately local zone time is calibrated, such as, the user can send the order of " calibrating local zone time immediately " by menu or certain instruction when using this video terminal, thereby makes this video terminal start calibration strategy immediately.
And the timing alignment strategy is to calibrate according to the type of calibration and the time that pre-set, and type of calibration here and time can arbitrarily be provided with in advance by the user.
S504: resolve described CMMB signal data and extraction date and time information wherein.According to the description of step S102 among the embodiment one, only need find the NIT table in the CMMB signal data here, and extract the system time field that wherein constitutes and get final product by 40 bit binary number.
S505: described date and time information is calibrated local zone time as time reference.
If the calibration strategy of the setting described in the step S503 is to calibrate strategy immediately, it is the very first time then with above-mentioned date and time information translation, obtain the difference of this very first time and local zone time, if this very first time is more Zao than local zone time, then calculate the poor of local zone time value and above-mentioned difference, if this very first time is more late than local zone time, then calculate local zone time and above-mentioned difference and, and with result of calculation replacement local zone time; The difference of storage is carried out aforementioned calculation before perhaps utilizing, and replaces local zone time with result of calculation; More or directly replace local zone time and preserve with this very first time.
If the calibration strategy of the setting described in the step S503 is the timing alignment strategy, then when the time of setting arrives, carry out described various calibration operations in the above-mentioned strategy of calibration immediately.
The embodiment of the invention is by receiving the CMMB signal data, resolving this CMMB signal data and extraction date and time information wherein, with the benchmark of this date and time information as the local zone time calibration, thereby not only make terminal can carry out high-precision local zone time calibration automatically with CMMB function, also avoided adding the extra cost that the GPS receiver module is brought, in addition, various calibrating mode and strategy have also enriched the local zone time Calibration Method.
Embodiment five
Be illustrated in figure 6 as the structural representation of a kind of local zone time calibrating installation that the embodiment of the invention three provides, this device comprises receiving element 610, resolve extraction unit 620 and time calibration unit 630, wherein resolve extraction unit 620 and be connected between receiving element 610 and the time calibration unit 630.
Receiving element 610 is a kind of radio receiving units, it is used to receive the CMMB signal data that CMMB system transmitting terminal sends, in actual applications, the CMMB signal data of its reception both can be the CMMB signal data of directly transmitting from satellite, it also can be the CMMB signal data of directly transmitting from supplement translator, can also be directly from CMMB system transmitting terminal, not limit the source of CMMB signal data in the present embodiment.Receiving element 610 can send this CMMB signal data to and resolve extraction unit 620 after receiving the CMMB signal data.
After parsing extraction unit 620 is received the CMMB signal data of receiving element 610 reception and registration, can resolve this CMMB signal data, and extract date and time information wherein.We know by the analysis among the embodiment one, date and time information in the CMMB signal is the time through the GPS time service, its precision is higher, this date and time information is arranged in CMMB signal frame NIT table, it is a field information that is made of 40 binary systems, has comprised 16 MJD date code and 24 timing code.Resolve after extraction unit 620 extracts these 40 binary fields, send it to unit 630 time calibration.
The embodiment of the invention is by receiving the CMMB signal data, resolving this CMMB signal data and extraction date and time information wherein, with the foundation of this temporal information as the local zone time calibration, thereby not only feasible terminal with local zone time calibrating installation of present embodiment can be carried out high-precision local zone time calibration automatically, has also avoided adding the extra cost that the GPS receiver module is brought.
Embodiment six
Be illustrated in figure 7 as the structural representation of a kind of local zone time calibrating installation that the embodiment of the invention six provides, this device comprises receiving element 710, resolves extraction unit 720, time calibration unit 730 and calibration policy unit 740, wherein unit 730 comprised difference memory module 731 again and calculated calibration module 732 time calibration, wherein, resolving extraction unit 720 links to each other with receiving element unit 710 time calibration 730 and calibration policy unit 740 respectively.
Receiving element 710 is used to receive the CMMB signal data that CMMB system transmitting terminal sends.
As one embodiment of the present of invention, this calibration strategy can be for calibrating strategy or timing alignment strategy immediately, and when the calibration strategy was tactful for calibrating immediately, calibration policy unit 740 specifically was used to receive calibration command immediately; And when the calibration strategy was the timing alignment strategy, calibration policy unit 740 specifically was used to receive the timing alignment instruction, and instruction is provided with the time of carrying out the local zone time calibration according to timing alignment.
It is the very first time that difference memory modules 731 in the time calibration unit 730 are used for above-mentioned date and time information translation, and obtains the difference of this very first time and local zone time.
Calculate calibration module 732 and be used under the situation more Zao of the above-mentioned very first time, calculating local zone time value and above-mentioned difference poor than local zone time; Under the situation more late of the above-mentioned very first time than local zone time, calculate local zone time and above-mentioned difference and, and replace local zone time with result of calculation and carry out local zone time and calibrate.
As one embodiment of the present of invention, the local zone time except calculate calibration with above-mentioned difference after, unit time calibration of present embodiment 730 can also comprise a direct calibration module 733, it is used for above-mentioned date and time information translation is the very first time, and directly replaces the calibration that local zone time is realized local zone time with this very first time.
The local zone time calibrating installation of the embodiment of the invention not only can carry out high-precision local zone time calibration automatically, but also has multiple abundant calibration strategy to realize diversified calibration approach.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method, can instruct relevant hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
Above-described embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is the specific embodiment of the present invention; and be not intended to limit the scope of the invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. a local zone time calibration steps is characterized in that, described method comprises:
Receive China Mobile multimedia broadcasting CMMB signal data;
Resolve described CMMB signal data and extract date and time information in the described CMMB signal data;
Described date and time information is calibrated local zone time as time reference.
2. local zone time calibration steps as claimed in claim 1 is characterized in that, described described date and time information is calibrated local zone time as time reference comprises:
With described date and time information translation is the very first time, obtain the difference of the described very first time and described local zone time, if the described very first time is more Zao than described local zone time, then calculate the poor of described local zone time value and described difference, if the described very first time is more late than described local zone time, then calculate described local zone time and described difference and, and replace described local zone time with result of calculation.
3. local zone time calibration steps as claimed in claim 1 is characterized in that, described described date and time information is calibrated local zone time as time reference comprises:
With described date and time information translation is the very first time, replaces described local zone time with the described very first time.
4. as the arbitrary described local zone time calibration steps of claim 1-3, it is characterized in that the described CMMB signal data of described parsing also extracts before the date and time information in the described CMMB signal data, this method also comprises:
Determine that according to the calibration strategy of setting needs carry out the local zone time calibration;
Described calibration strategy comprises: calibrate strategy or timing alignment strategy immediately;
Described calibration strategy according to setting determines that needs carry out the local zone time calibration and comprise:
At described calibration strategy is under the situation of the described strategy of calibration immediately, receives calibration command immediately, determines that according to described calibration command immediately needs carry out the local zone time calibration; Or
At described calibration strategy is under the situation of described timing alignment strategy, determines that according to the time of described timing alignment strategy setting needs carry out the local zone time calibration.
5. as the arbitrary described local zone time calibration steps of claim 1-3, it is characterized in that before the described reception China Mobile multimedia broadcasting CMMB signal data, this method also comprises:
Judge whether the CMMB receiver module starts,, then start described CMMB receiver module if do not start;
Described reception China Mobile multimedia broadcasting CMMB signal data is specially:
Described CMMB receiver module receives China Mobile multimedia broadcasting CMMB signal data.
6. local zone time calibration steps as claimed in claim 4 is characterized in that, before the described reception China Mobile multimedia broadcasting CMMB signal data, this method also comprises:
Judge whether the CMMB receiver module starts,, then start described CMMB receiver module if do not start;
Described reception China Mobile multimedia broadcasting CMMB signal data is specially:
Described CMMB receiver module receives China Mobile multimedia broadcasting CMMB signal data.
7. local zone time calibration steps as claimed in claim 1 is characterized in that, described CMMB signal data of described parsing and the date and time information of extracting in the described CMMB signal data comprise:
Determine multiplexed frame 0 in the described CMMB signal data according to flag of frame;
The described date and time information of extraction from the payload of described multiplexed frame 0, described date and time information comprise 16 MJD date codes and 24 timing codes of encoding by BCD.
8. local zone time calibration steps as claimed in claim 7 is characterized in that, described described date and time information is comprised as time reference:
According to following formula described MJD date code is converted to the date:
Y’＝int[(MJD-15078.2)/365.25
M’＝int{[MJD-14956.1-int(Y’*365.25)]/30.6001}
D＝MJD-14956-int(Y’*365.25)-int(M’*30.6001)
K: if M '==14 or M '==15, K=1 so; Otherwise K=0
Y ＝Y’+K
M ＝M’-1-K*12
Wherein, Y is year, and M is the moon, and D is day; With
Restore described timing code time corresponding according to corresponding BCD coding.
9. a local zone time calibrating installation is characterized in that, described device comprises:
Receiving element is used to receive China Mobile multimedia broadcasting CMMB signal data;
Resolve extraction unit, the date and time information that is used for resolving described CMMB signal data and extracts described CMMB signal data;
Time calibration, the unit was calibrated as time reference described date and time information to local zone time.
10. local zone time calibrating installation as claimed in claim 9 is characterized in that, described time calibration, the unit comprised:
The difference memory module, being used for described date and time information translation is the very first time, obtains the difference of the described very first time and described local zone time;
Calculate calibration module, be used for the described very first time than the Zao situation of described local zone time under, calculate the poor of described local zone time value and described difference; Under the situation more late of the described very first time than described local zone time, calculate described local zone time and described difference and, and replace described local zone time with result of calculation.
11. local zone time calibrating installation as claimed in claim 9 is characterized in that, described time calibration, specifically to be used for described date and time information translation be the very first time in the unit, replaces described local zone time with the described very first time.
12. as the arbitrary described local zone time calibrating installation of claim 9-11, it is characterized in that, also comprise:
The calibration policy unit is used for reception instruction is set, according to the described calibration strategy that instructs setting to carry out the local zone time calibration that is provided with;
Described parsing extraction unit specifically is used for according to the described CMMB signal data of described calibration policy resolution of described calibration policy unit setting and extracts the date and time information of described CMMB signal data.
13. local zone time calibrating installation as claimed in claim 12 is characterized in that, described calibration strategy is tactful for calibration immediately, and described calibration policy unit specifically is used to receive calibration command immediately;
Described parsing extraction unit specifically is used for receiving in described calibration policy unit resolves CMMB signal data that described receiving element receives and the date and time information of extracting described CMMB signal data under the situation of described calibration command immediately.
14. local zone time calibrating installation as claimed in claim 12, it is characterized in that, described calibration strategy is the timing alignment strategy, and described calibration policy unit specifically is used to receive the timing alignment instruction, according to described timing alignment instruction is set the time of carrying out the local zone time calibration;
The date and time information that described parsing extraction unit specifically is used for resolving the CMMB signal data of described receiving element reception when the described time of carrying out the local zone time calibration arrives and extracts described CMMB signal data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101501891A CN101959036A (en) | 2009-07-16 | 2009-07-16 | Method and device for calibrating local time |
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| CN102572711A (en) * | 2012-01-21 | 2012-07-11 | 中广传播集团有限公司 | Terminal clock and external clock difference synchronization method |
| CN103995461A (en) * | 2014-05-14 | 2014-08-20 | 王辉 | Bluetooth radio wave zero calibration and timing system and method |
| CN105071884A (en) * | 2015-07-29 | 2015-11-18 | 北京海尔集成电路设计有限公司 | Equipment for time calibration based on CDR and method |
| CN106097496A (en) * | 2016-06-07 | 2016-11-09 | 北京千丁互联科技有限公司 | Control of bluetooth access management system, control of bluetooth access equipment and time calibrating method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102572711A (en) * | 2012-01-21 | 2012-07-11 | 中广传播集团有限公司 | Terminal clock and external clock difference synchronization method |
| CN103995461A (en) * | 2014-05-14 | 2014-08-20 | 王辉 | Bluetooth radio wave zero calibration and timing system and method |
| WO2015172531A1 (en) * | 2014-05-14 | 2015-11-19 | 王辉 | Bluetooth and radio wave zero calibration and time service system and method |
| CN103995461B (en) * | 2014-05-14 | 2016-03-30 | 王辉 | Blue teeth wireless electric wave school zero, time dissemination system and method |
| CN105071884A (en) * | 2015-07-29 | 2015-11-18 | 北京海尔集成电路设计有限公司 | Equipment for time calibration based on CDR and method |
| CN106097496A (en) * | 2016-06-07 | 2016-11-09 | 北京千丁互联科技有限公司 | Control of bluetooth access management system, control of bluetooth access equipment and time calibrating method thereof |
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