CN104113716A - Digital videocast receiving module and operation method thereof - Google Patents
Digital videocast receiving module and operation method thereof Download PDFInfo
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Abstract
The present invention provides a digital videocast receiving module and an operation method thereof. The receiving module comprises a first demodulation unit used for obtaining the number of a plurality of data entity layer pipelines in an intermediate frequency signal, and establishing a corresponding relationship between the plurality of data entity layer pipelines and at least one group identification; a control unit used for deciding a plurality of sequence numbers of which the number is same as the number of the data entity layer pipelines, and selecting a sequence number from the plurality of sequence numbers; and a second demodulation unit used for selecting a data entity layer pipeline corresponding to the sequence number from the plurality of data entity layer pipelines, and generating a transmission series flow by the data of the plurality of data entity layer pipelines in the intermediate frequency signal and the data of a common entity layer pipeline in accordance with the corresponding relationship, wherein the group identification of the data entity layer pipelines is same with the group identification of the common entity layer pipeline.
Description
Technical field
The present invention is about a kind of digital video broadcast reception module and How It Works thereof, espespecially a kind of digital video broadcast reception module and How It Works thereof with low complex degree and low delay.
Background technology
In order to transmit more efficiently program service, multiple entities layer pipeline (multiple physical layer pipes, MPLPs) technology that digital video has been broadcasted (Digital Video Broadcasting, DVB) System Development.Specifically, in transmitting transmission stream (the transport stream that carries program service, TSs) before, transmission end can first be divided into identical group by the transmission stream with similar content, again by similar content in the transmission stream of same group is captured out, the common physical layer pipeline (common PLP) that transmission stream is converted to the more dissimilar physical layer pipeline of content and is made up of similar content.Therefore,, in the time transmitting the transmission stream of same group by T2 frame, transmission end only needs to transmit the similar content of once being carried by common physical layer pipeline, and does not need repeatedly to transmit similar content.Thus, can save and transmit the required resource (as frequency range resource or time resource etc.) of transmission stream.
Accordingly, receive after T2 frame in receiving terminal, while preparing decoding one transmission stream, need be prior to finding the corresponding physical layer pipeline of this transmission stream in received signal, then find the common physical layer pipeline with physical layer pipeline with same group identification.Then, receiving terminal just can use physical layer pipeline and common physical layer pipeline in producing (i.e. reduction) transmission stream, with according to its corresponding control signal, transmission stream is decoded as to program service.
Be more than taking single group as example, the mode of receiving terminal decoding transmission stream is described.When the T2 frame receiving when receiving terminal includes the transmission stream of multiple groups, the receiving terminal in known technology need to spend high latency and or multiple transmission streams with different group identification of decoding of larger storage element.For instance, in the time that the less storage element of receiving terminal wish cost is decoded a transmission stream, just need the longer time (more T2 frame) of cost in searching common physical layer pipeline, just physical layer pipeline and the common physical layer pipeline with same group identification can be complex as to transmission stream, and then transmission stream is decoded as to program service.On the contrary, in the time that a transmission stream is decoded in the shorter delay of receiving terminal wish cost, just need the larger storage element of cost to store the common physical layer pipeline with different group identification, just can rapidly physical layer pipeline and the common physical layer pipeline with same group identification be complex as to transmission stream, and then transmission stream is decoded as to program service.In simple terms, receiving terminal need to make trade-offs between low delay and low storage element, is difficult to take into account both simultaneously.Therefore, receiving terminal is how under the situation of low delay and low complex degree, and multiple transmission streams with different group identification of decoding are respectively problem demanding prompt solutions.
Summary of the invention
Therefore, main purpose of the present invention is to provide a kind of digital video broadcast reception module and How It Works thereof, to address the above problem.
The present invention discloses a kind of digital video broadcast (Digital Video Broadcasting, DVB) receiver module, be used for carrying out an automatic channel search program, this ground digital video broadcast reception module includes one first demodulating unit, be used for receiving an intermediate-freuqncy signal, to obtain multiple physical layer data pipelines (physical layer pipes in this intermediate-freuqncy signal, PLPs) a quantity, and set up the corresponding relation between the plurality of physical layer data pipeline and at least one group identification (group identification, group ID); One control unit, is coupled to this first demodulating unit, is used for receiving this quantity of the plurality of physical layer data pipeline, with according to this quantity, determines multiple serial numbers that this quantity is individual, and from the plurality of serial number, selects a serial number; And one second demodulating unit, be coupled to this first demodulating unit and this control unit, be used for receiving this serial number, to select the physical layer data pipeline corresponding to this serial number from the plurality of physical layer data pipeline, and then according to this corresponding relation, use the data of this physical layer data pipeline in this intermediate-freuqncy signal and the data of a common physical layer pipeline in producing a transmission stream (transport stream), wherein a group identification of a group identification of this physical layer data pipeline and this common physical layer pipeline is identical.
The present invention separately discloses a kind of method of carrying out automatic channel search program, for a digital video broadcast (Digital Video Broadcasting, DVB) in receiver module, the method includes reception one intermediate-freuqncy signal, to obtain multiple physical layer data pipelines (physical layer pipes in this intermediate-freuqncy signal, PLPs) a quantity, and set up the corresponding relation between the plurality of physical layer data pipeline and at least one group identification (group identification, group ID); According to this quantity, determine multiple serial numbers that this quantity is individual, and from the plurality of serial number, select a serial number; And to select the physical layer data pipeline corresponding to this serial number from the plurality of physical layer data pipeline, and then according to this corresponding relation, use the data of this physical layer data pipeline in this intermediate-freuqncy signal and the data of a common physical layer pipeline in producing a transmission stream (transport stream), wherein a group identification of a group identification of this physical layer data pipeline and this common physical layer pipeline is identical.
Brief description of the drawings
Fig. 1 is the schematic diagram of the embodiment of the present invention one digital video broadcast reception module.
Fig. 2 is the schematic diagram of the embodiment of the present invention one T2 frame.
Fig. 3 is the schematic diagram of the embodiment of the present invention one table 30.
Fig. 4 is the schematic diagram of the embodiment of the present invention one flow process.
Fig. 5 is the schematic diagram of the embodiment of the present invention one flow process.
[main element symbol description]
Embodiment
Please refer to Fig. 1, Fig. 1 is the embodiment of the present invention one digital video broadcast (Digital Video Broadcasting, DVB) schematic diagram of receiver module 10, it is made up of a frequency modulation unit 100, one first demodulating unit 102, one second demodulating unit 104, a control unit 106 and a back-end processing unit 108.Digital video broadcast reception module 10 is supported multiple entities layer pipeline (multiple physical layer pipes, MPLPs) technology, can be used to receive multiple transmission streams (the transport stream being transmitted on one or more frequency band, TSs), and transmission stream is decoded as to program service, carry out automatic channel search program, wherein multiple transmission streams can have different group identification (Group IDs).In the time realizing digital video broadcast reception module, can, according to system requirements and/or design consideration, the first demodulating unit 102 and the second demodulating unit 104 be integrated into a demodulation module, be not limited to this.
Specifically, frequency modulation unit 100 is used for receiving a radiofrequency signal sig_RF at least one radio frequency (radio frequency, RF) signal, and radiofrequency signal sig_RF is converted to an intermediate-freuqncy signal sig_IF.Preferably, radiofrequency signal sig_RF is second generation ground digital video broadcast (DVB-Second Generation Terrestrial, DVB-T2) signal.The first demodulating unit 102 is coupled to frequency modulation unit 100, be used for receiving intermediate frequency signal sig_IF, to obtain the quantity num_data_PLP of multiple physical layer data pipelines in intermediate-freuqncy signal sig_IF, and set up the corresponding relation between multiple physical layer data pipelines and at least one group identification (group identification, group ID).Control unit 106 is coupled to the first demodulating unit 102, be used for received quantity num_data_PLP, with according to this quantity num_data_PLP, determine num_data_PLP serial number, and from this num_data_PLP serial number, select a serial number seq_num.The second demodulating unit 104 is coupled to the first demodulating unit 102 and control unit 106, be used for receiving sequence number seq_num, to select the physical layer data pipeline corresponding to serial number seq_num from multiple physical layer data pipelines, and then according to the corresponding relation between multiple physical layer data pipelines and at least one group identification, in use intermediate-freuqncy signal sig_IF, the data of this physical layer data pipeline and the data of a common physical layer pipeline are in producing a transmission stream TPS, wherein the group identification of the group identification of this physical layer data pipeline and this common physical layer pipeline is identical.Back-end processing unit 108 is coupled to the second demodulating unit 104 and control unit 106, being used for transmission stream TPS decoding (as message decoding and/or image-decoding) is a program service with a program identification prog_ID, and return program identification prog_ID is to control unit 106.Therefore, according to the above, digital video broadcast reception module 10 can be under the situation of low delay and low complex degree, and multiple transmission streams with different group identification of decoding have respectively solved the problem that known technology is difficult to take into account both simultaneously.
Please refer to Fig. 2, it is the schematic diagram of the embodiment of the present invention one T2 frame 20, and T2 frame 20 is arranged in intermediate-freuqncy signal sig_IF, offers the first demodulating unit 102 by frequency modulation unit 100, or is obtained to frequency modulation unit 100 by the first demodulating unit 102.As shown in Figure 2, T2 frame 20 includes P1 symbol 210, P2 symbol 220 and data symbol 230.Further, P2 symbol 220 includes the control signal such as L1pre signaling 222 and L1post signaling 224.
Specifically, L1pre signaling 222 includes for detecting (as separated modulation, decoding) the required information of L1post signaling 224.L1post signaling 224 includes 9 physical layer pipeline PLP0～PLP8 for example, with multiple group identification (Group ID) (Group ID=0,1 or 2), and it includes physical layer data pipeline (data PLPs) PLP0, PLP2, PLP4 and PLP6～PLP8 and common physical layer pipeline (common PLPs) PLP1, PLP3 and PLP5.In addition, physical layer pipeline PLP0～PLP8 has respectively physical layer pipeline identification (PLP ID) 0～8.Accordingly, data symbol 230 includes 9 physical layer pipeline PLP0a～PLP8a for example, with multiple group identification (Group ID=0,1 or 2), and it includes physical layer data pipeline PLP0a, PLP2a, PLP4a and PLP6a～PLP8a and common physical layer pipeline PLP1a, PLP3a and PLP5a.In addition, physical layer pipeline PLP0a～PLP8a have respectively physical layer pipeline identification 0,1 ..., 7 and 8.Different from L1post signaling 224 is, what in data symbol 230, physical layer pipeline PLP0a～PLP8a carried is the data of program service, is the information (as parameters such as code rate (code rate), modulation kenels (modulation type)) required for physical layer pipeline PLP0a～PLP8a in decoded data symbol 230 and in L1post signaling 224, physical layer pipeline PLP0～PLP8 carries.
Please refer to Fig. 3, it is the schematic diagram of the corresponding relation 30 of embodiment of the present invention physical layer data pipeline and group identification.As shown in Figure 3, in the time of processing entities layer pipeline PLP0～PLP8, in the time of acquisition phase place (acquisition phase), the first demodulating unit 102 can be set up the corresponding relation 30 between physical layer data pipeline PLP0, PLP2, PLP4 and PLP6～PLP8 and group identification, with serial number seq_num Identification Data physical layer pipeline, and the quantity num_data_PLP=6 of acquisition physical layer data pipeline.That is to say, the first demodulating unit 102 only can be considered identification (i.e. numbering) and the quantity of physical layer data pipeline, and to avoid choosing, non-existent PLP ID or selected PLP ID likely point to common physical layer pipeline and the problem that cannot decode.
The method of setting up the corresponding relation of physical layer data pipeline and group identification has a variety of, for instance, please refer to Fig. 4, and it is the schematic diagram of the embodiment of the present invention one flow process.Flow process 40, for the first demodulating unit 102 of Fig. 1, is used for setting up the corresponding relation of physical layer data pipeline and group identification, and it comprises following steps:
Step 400: start.
Step 402: detect a physical layer pipeline in a L1post signaling.
Step 404: in the time that this physical layer pipeline is a physical layer data pipeline, store its group identification.
Step 406: whether detected complete this L1post signaling.If so, perform step 408; If not, execution step 402, to continue to detect a next physical layer pipeline.
Step 408: according to the physical layer data pipeline having detected, determine a quantity of all physical layer data pipelines in this L1post signaling.
Step 410: finish.
After processing P2 symbol 220, for example, from next T2 frame, digital video broadcast reception module 10(in more detail, the second demodulating unit 104) can start to process physical layer data pipeline PLP0a～PLP8a in data symbol 230, enter follow the trail of phase place (tracking phase).In P2 symbol 220 in T2 frame, the serial number seq_num that the second demodulating unit 104 can be given according to control unit 106, select the information (carrying out the required information of decoding) corresponding to the physical layer data pipeline of this serial number seq_num, and according to corresponding relation 30, find the information (also for carrying out the required information of decoding) of corresponding common physical layer pipeline.Then, according to these information, the second demodulating unit 104 can extract the data (data to be decoded) of corresponding physical layer data pipeline and common physical layer pipeline by physical layer pipeline PLP0a～PLP8a from data symbol 230, and is decoded as transmission stream TPS.Should be noted, due to the physical layer pipeline identification 0～8th in L1post224, one to one corresponding in and data symbol 230 in physical layer pipeline identification 0～8, according to corresponding relation 30, the second demodulating unit 104 can avoid choosing that non-existent PLP ID or selected PLP ID likely point to common physical layer pipeline and the problem that cannot decode, with processing entities layer pipeline PLP0a～PLP8a efficiently.
For instance, in the time receiving seq_num=0, according to corresponding relation 30, the second demodulating unit 104 can be interrogated speed and in L1post signaling 224, be found corresponding physical layer data pipeline PLP0 and have same group the common physical layer pipeline PLP1 that identifies (Group ID=0), the information comprising according to physical layer data pipeline PLP0 and common physical layer pipeline PLP1 is again (as code rate, the parameters such as modulation kenel), from data symbol 230, find physical layer data pipeline PLP0a and common physical layer pipeline PLP1a, and then physical layer data pipeline PLP0a and common physical layer pipeline PLP1a are decoded as to transmission stream TPS.Then, back-end processing unit 108 can be the program service with program identification prog_ID by transmission stream TPS decoding (as message decoding and/or image-decoding), and return program identification prog_ID is to control unit 106.After program receiving identification prog_ID, control unit 106 can further be set up the corresponding relation between program identification prog_ID and serial number seq_num, for example (seq_num=0, prog_ID=0), and from multiple serial numbers, select next serial number as serial number seq_num=1, continue to produce next transmission stream TPS according to serial number seq_num=1 for the second demodulating unit 104.The processing mode of remainder data physical layer pipeline (corresponding to seq_num=1～5) is also identical, does not repeat in this.After physical layer pipeline in processing in data symbol 230, while meeting seq_num=num_data_PLP, control unit 106 can indicate frequency modulation unit 100 to continue to search and receive next radiofrequency signal sig_RF, and be converted into intermediate-freuqncy signal sig_IF, according to the above, continue to produce transmission stream TPS, and be decoded as the program service with program identification prog_ID.All the other flow processs can, with reference to aforementioned, not repeat in this.
According to the above, Fig. 1 illustrates digital video broadcast reception module 10 and carries out the function mode of automatic channel search program and can be summarized as the flow process 50 in Fig. 5, and it comprises following steps:
Step 500: start.
Step 502: receive a radiofrequency signal at least one radiofrequency signal, and this radiofrequency signal is converted to an intermediate-freuqncy signal.
Step 504: according to a P1 symbol of a T2 frame in this intermediate-freuqncy signal, detect a P2 symbol of this T2 frame.
Step 506: sequentially process at least one first instance layer pipeline in a L1post signaling of this P2 symbol, to set up one first corresponding relation between at least one physical layer data pipeline and at least one group identification in this at least one first instance layer pipeline, determine a quantity of this at least one physical layer data pipeline, and determine at least one serial number that this quantity is individual.
Step 508: according to information in a serial number, this corresponding relation and this at least one first instance layer pipeline in this at least one serial number, use in a data symbol of this T2 frame at least one second instance layer pipeline in producing a transmission stream.
Step 510: the program service that this transmission stream is decoded as, return a program identification of this program service, and set up one second corresponding relation between this serial number and this program identification.
Step 512: whether this at least one physical layer data pipeline of processed this quantity.If so, perform step 508, to process a next serial number in this at least one serial number; If not, execution step 514.
Step 514: whether processed this at least one radiofrequency signal that completes.If so, perform step 516; If not, execution step 502, to process a next radiofrequency signal in this at least one radiofrequency signal.
Step 516: finish.
Flow process 50 is for illustrating that digital video broadcast reception module 10 carries out the function mode of automatic channel search program, describes in detail and changes and can, with reference to aforementioned, not repeat in this.
In sum, the invention provides a kind of automatic channel search program can be under the situation of low delay and low complex degree, and multiple transmission streams with different group identification of decoding have respectively solved the problem that known technology is difficult to take into account both simultaneously.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the claims in the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (16)
1. a digital video broadcast reception module, is used for carrying out an automatic channel search program, and this ground digital video broadcast reception module includes:
One first demodulating unit, is used for receiving an intermediate-freuqncy signal, to obtain a quantity of multiple physical layer data pipelines in this intermediate-freuqncy signal, and sets up the corresponding relation between the plurality of physical layer data pipeline and at least one group identification;
One control unit, is coupled to this first demodulating unit, is used for receiving this quantity of the plurality of physical layer data pipeline, with according to this quantity, determines multiple serial numbers that this quantity is individual, and from the plurality of serial number, selects a serial number; And
One second demodulating unit, be coupled to this first demodulating unit and this control unit, be used for receiving this serial number, to select the physical layer data pipeline corresponding to this serial number from the plurality of physical layer data pipeline, and then according to this corresponding relation, use the data of this physical layer data pipeline in this intermediate-freuqncy signal and the data of a common physical layer pipeline in producing a transmission stream, wherein a group identification of a group identification of this physical layer data pipeline and this common physical layer pipeline is identical.
2. digital video broadcast reception module as claimed in claim 1, is characterized in that, separately includes:
One frequency modulation unit, is coupled to this first demodulating unit, is used for receiving a radiofrequency signal at least one radiofrequency signal, and this radiofrequency signal is converted to this intermediate-freuqncy signal.
3. digital video broadcast reception module as claimed in claim 2, is characterized in that, this radiofrequency signal is a second generation ground digital video broadcast singal.
4. digital video broadcast reception module as claimed in claim 2, is characterized in that, separately includes:
One back-end processing unit, is coupled to this second demodulating unit and this control unit, is used for this transmission stream to be decoded as a program service with a program identification, and returns this program identification to this control unit.
5. digital video broadcast reception module as claimed in claim 4, it is characterized in that, after receiving this program identification, this control unit is set up the corresponding relation between this program identification and this serial number, and from the plurality of serial number, select a next serial number as this serial number, produce a next transmission stream for this second demodulating unit according to this serial number.
6. digital video broadcast reception module as claimed in claim 5, it is characterized in that, in the time that the plurality of serial number does not have this next one serial number, this control unit indicates this frequency modulation unit to receive another radiofrequency signal in this at least one radiofrequency signal, and this another radiofrequency signal is converted to this intermediate-freuqncy signal.
7. digital video broadcast reception module as claimed in claim 1, is characterized in that, according to a control signal of the plurality of physical layer data pipeline in this intermediate-freuqncy signal, this first demodulating unit obtains this quantity of the plurality of physical layer data pipeline.
8. digital video broadcast reception module as claimed in claim 7, it is characterized in that, according to this control signal and this corresponding relation, this second demodulating unit uses these data of this physical layer data pipeline in this intermediate-freuqncy signal and these data of this common physical layer pipeline in producing this transmission stream.
9. carry out a method for automatic channel search program, for a digital video broadcast reception module, the method includes:
Receive an intermediate-freuqncy signal, to obtain a quantity of multiple physical layer data pipelines in this intermediate-freuqncy signal, and set up the corresponding relation between the plurality of physical layer data pipeline and at least one group identification;
According to this quantity, determine multiple serial numbers that this quantity is individual, and from the plurality of serial number, select a serial number; And
To select the physical layer data pipeline corresponding to this serial number from the plurality of physical layer data pipeline, and then according to this corresponding relation, use the data of this physical layer data pipeline in this intermediate-freuqncy signal and the data of a common physical layer pipeline in producing a transmission stream, wherein a group identification of a group identification of this physical layer data pipeline and this common physical layer pipeline is identical.
10. method as claimed in claim 9, is characterized in that, separately includes:
Receive a radiofrequency signal at least one radiofrequency signal, and this radiofrequency signal is converted to this intermediate-freuqncy signal.
11. methods as claimed in claim 10, is characterized in that, this radiofrequency signal is a second generation ground digital video broadcast singal.
12. methods as claimed in claim 10, is characterized in that, separately include:
This transmission stream is decoded as to a program service with a program identification, and returns this program identification.
13. methods as claimed in claim 12, is characterized in that, separately include:
After this program identification of return, set up the corresponding relation between this program identification and this serial number, and from the plurality of serial number, select a next serial number as this serial number, to produce a next transmission stream according to this serial number.
14. methods as claimed in claim 13, is characterized in that, separately include:
In the time that the plurality of serial number does not have this next one serial number, receive another radiofrequency signal in this at least one radiofrequency signal, and this another radiofrequency signal is converted to this intermediate-freuqncy signal.
15. methods as claimed in claim 9, is characterized in that, separately include:
According to a control signal of the plurality of physical layer data pipeline in this intermediate-freuqncy signal, obtain this quantity of the plurality of physical layer data pipeline.
16. methods as claimed in claim 15, is characterized in that, separately include:
According to this control signal and this corresponding relation, use these data of this physical layer data pipeline in this intermediate-freuqncy signal and these data of this common physical layer pipeline in producing this transmission stream.
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| CN201310131476.4A CN104113716A (en) | 2013-04-16 | 2013-04-16 | Digital videocast receiving module and operation method thereof |
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Application publication date: 20141022 |