CN105120303A - Method for transmitting digital TV signal and digital TV system - Google Patents
Method for transmitting digital TV signal and digital TV system Download PDFInfo
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- CN105120303A CN105120303A CN201510509084.6A CN201510509084A CN105120303A CN 105120303 A CN105120303 A CN 105120303A CN 201510509084 A CN201510509084 A CN 201510509084A CN 105120303 A CN105120303 A CN 105120303A
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- signal
- digital television
- modulation system
- downlink data
- inserter
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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]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
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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]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6125—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via Internet
-
- 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]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6131—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a mobile phone network
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention discloses a method for transmitting a digital TV signal. The method comprises steps of loading a digital TV downlink signal, a downlink data signal, and a uplink data signal onto a MAP periodic signal on the basis of an interpolator on a digital TV system; and achieving duplex communication based on TDMA by means of the loaded MAP periodic signal. The invention also discloses a digital TV system comprising an interpolator and a communication module. The interpolator is used for loading the digital TV downlink signal, the downlink data signal, and the uplink data signal onto the MAP periodic signal. The communication module is used for achieving duplex communication based on TDMA by means of the loaded MAP periodic signal. According to the method and the digital TV system, the digital TV signal and the data signals are loaded onto the MAP periodic signal so as to complete communication based on TDMA, guarantee simultaneous transmission of digital TV and data, achieve bidirectional digital TV, and solve difficulties in frequency spectrum distribution and management.
Description
Technical field
The present invention relates to digital television techniques field, be specifically related to a kind of method and digital television system of transmitting digital TV signal.
Background technology
The processes such as terrestrial digital television system is is by the shooting with video-corder of traditional TV signal by terrestrial DTV, edit, transmit, reception all adopt the Generation Tv system of digital technology.It has information transmission security, quality is high, information capacity is large and the feature such as personalized service.The development of terrestrial DTV is also the important symbol of the local economic level of measurement one, educational level, and terrestrial DTV replaces simulated television and to be inevitable developing direction.
A problem of existing digital television techniques be data upload problem.According to national planning, within 2015, China will complete radio and television Analog-digital Converter.This will discharge a large amount of hyperfrequency (UHF) resource of frequency range, and the core missions of Next generation broadcasting network wireless system (NGB-W) are exactly effectively utilize this important frequency spectrum resource, realize the amalgamation and coexistence of radio broadcasting and two-way communication, promote that broadcasting and TV develop to wireless full-service service orientation.
Due to present digital television techniques and IP network technology difference architecturally, traditional data uploading method, uses the technology of IP network to carry out often, so just Digital Television is passed down and has separated with the biography up and down of data.Existing separation scheme generally adopts the implementation of the large tower+trourelle shown in Fig. 1.In this in implementation, large tower is used for transmitting digital TV signal, and trourelle is used for transmission of data signals.Upload in scheme at great Ta+trourelle, trourelle can adopt existing many technology to realize, such as white spectrum communication technique, IEEE802.22, LTE etc.Another implementation pattern is exactly transmitted by the TS stream of data-signal as a Digital Television, but difficult in realization, nor meets the development trend of IPization.
In Digital Television, owing to passing down of Digital Television being separated with the biography up and down of data, just cause the difficulty in spectrum allocation may and managerial difficulty, particularly can not meet the demand in existing frequency spectrum policy.
Summary of the invention
The invention provides a kind of method and digital television system of transmitting digital TV signal, solve the problem that existing digital television signal is separated with data-signal, realize the amalgamation and coexistence of air digital television signals and bidirectional data communication, promote that broadcasting and TV business develops to wireless full-service service orientation.
The invention provides a kind of method of transmitting digital TV signal, comprise the steps:
Digital television system is loaded on MAP periodic signal based on inserter control figure TV downstream signal, downlink data signal and upstream data. signals;
MAP periodic signal after loading is carried out duplex communication based on TDMA mode.
Described being loaded on MAP periodic signal based on inserter control figure TV downstream signal, downlink data signal and upstream data. signals in digital television system comprises:
Digital Television downstream signal, downlink data signal and upstream data. signals is entered at a MAP cycle interpolation.
Described being loaded on MAP periodic signal based on inserter control figure TV downstream signal, downlink data signal and upstream data. signals in digital television system comprises:
The length of the time slot of control figure TV downstream signal;
Control the length of the time slot of downlink data signal;
Control the length of the time slot of upstream data. signals.
Described be loaded on MAP periodic signal based on inserter control figure TV downstream signal, downlink data signal and upstream data. signals in digital television system before also comprise:
Resolve the modulation system of downlink data signal and Digital Television downstream signal;
Judge that whether the modulation system of described downlink data signal is identical with the modulation system of described Digital Television downstream signal;
When judging that the modulation system of described downlink data signal is identical with the modulation system of described Digital Television downstream signal, then controlled inserter before exciter, load MAP periodic signal; When judging that the modulation system of described downlink data signal is different from the modulation system of described Digital Television downstream signal, then control inserter after exciter, load MAP periodic signal.
The modulation system of described downlink data signal is OFDMA modulation system or is single-carrier modulated mode; The modulation system of described Digital Television downstream signal is OFDMA modulation system or is single-carrier modulated mode; Described upstream data. signals adopts single-carrier modulated mode or is the modulation system of multiple channel by the frequency frequency division in the 6/7/8MHz broadband of TV.
Accordingly, present invention also offers a kind of digital television system, described system comprises:
Inserter, is loaded into MAP periodic signal for control figure TV downstream signal, downlink data signal and upstream data. signals;
Communication module, for carrying out duplex communication by the MAP periodic signal after loading based on TDMA mode.
Described inserter is also for entering Digital Television downstream signal, downlink data signal and upstream data. signals at a MAP cycle interpolation.
Described inserter is also for the length of the time slot of control figure TV downstream signal; Control the length of the time slot of downlink data signal; Control the length of the time slot of upstream data. signals.
Described system also comprises:
Modulation parsing module, for resolving the modulation system of downlink data signal and Digital Television downstream signal;
Modulation judge module, for judging that whether the modulation system of described downlink data signal is identical with the modulation system of described Digital Television downstream signal;
Modulation treatment module, for when judging that the modulation system of described downlink data signal is identical with the modulation system of described Digital Television downstream signal, then controlled inserter before exciter, loads MAP periodic signal; When judging that the modulation system of described downlink data signal is different from the modulation system of described Digital Television downstream signal, then control inserter after exciter, load MAP periodic signal.
The modulation system of described downlink data signal is OFDMA modulation system or is single-carrier modulated mode; The modulation system of described Digital Television downstream signal is OFDMA modulation system or is single-carrier modulated mode; Described upstream data. signals adopts single-carrier modulated mode or is the modulation system of multiple channel by the frequency frequency division in the 6/7/8MHz broadband of TV.
The embodiment of the present invention is by loading digital television signal and data-signal at MAP periodic signal, thus complete communication based on TDMA, ensure that Digital Television and data communication are transmitted simultaneously, achieved digital television bidirectional, solved the difficulty in spectrum allocation may and managerial difficulty.In whole implementation process, adopt narrow-band technologies can be applicable to the covering on a large scale of digital television signal, low speed, low cost and low-power consumption.In the process, the descending holding time of Digital Television, data downstream holding time and data uplink holding time can dynamic assignment, to meet the demand of practical application.If the demand of transfer of data is higher, just can reduce the Digital Television descending time taken, thus reduce the tricks of a TV frequency transmitting digital TV program.Meanwhile, the time of transfer of data just increases relatively, thus can transmit more data.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 be large tower+trourelle in existing digital television system realize system configuration schematic diagram;
Fig. 2 is the method flow diagram of the transmitting digital TV signal in the embodiment of the present invention;
Fig. 3 is existing MAP periodic structure schematic diagram;
Fig. 4 is the MAP periodic structure schematic diagram in the embodiment of the present invention;
Fig. 5 is the digital television system structural representation in the embodiment of the present invention;
Fig. 6 is existing digital television system embody rule structural representation;
Fig. 7 is the digital television system embody rule structural representation in the embodiment of the present invention;
Fig. 8 is another structural representation of digital television system embody rule in the embodiment of the present invention;
Fig. 9 is the inserter structural representation in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
TDMA (TimeDivisionMultipleAccess) time division multiple access is that time division is become periodic frame (Frame), each frame is divided into several time slots to send signal to base station again, under satisfied timing and synchronous condition, base station can receive the signal of each mobile terminal respectively and mixedly to disturb in each time slot.Meanwhile, the signal that base station is sent to multiple mobile terminal is arranged in all in order in predetermined time slot and transmits, as long as each mobile terminal receives in the time slot of specifying, just in the signal on Neng He road, the signal distinguishing issuing it is received.In this mode, the broadcast characteristic of Digital Television is not considered in usual use.
In embodiment of the present invention process, in the procedure of transmitting digital TV signal, be mainly loaded on MAP periodic signal based on inserter control figure TV downstream signal, downlink data signal and upstream data. signals in digital television system; MAP periodic signal after loading is carried out duplex communication based on TDMA mode.
MAP (MobileApplicationPart, MAP) be a kind of SS7 agreement, mobile network's signaling architecture can be realized, MAP is the automatic roaming function in order to complete travelling carriage, the signaling of pass-along message between mobile communications network entity, it is a distinctive function singleness interconnected between network, MAP specification gives mobile network the necessary signaling capability required when using No.7 signaling system, to provide the business that mobile network is necessary, comprise speech and non-speech service etc.
Fig. 2 shows the method flow diagram of the transmitting digital TV signal in the embodiment of the present invention, and this step comprises the steps:
The modulation system of S201, parsing downlink data signal Digital Television downstream signal;
S202, judge that whether the modulation system of downlink data signal is identical with the modulation system of Digital Television downstream signal, if the same enters into S203, if difference, enters into S204;
S203, control inserter loaded MAP periodic signal before exciter;
S204, control inserter load MAP periodic signal after exciter;
It should be noted that, the modulation system of this downlink data signal is OFDMA modulation system or is single-carrier modulated mode; The modulation system of this Digital Television downstream signal is OFDMA modulation system or is single-carrier modulated mode; Do upstream data. signals to adopt single-carrier modulated mode or be the modulation system etc. of multiple channel by the frequency frequency division in the 6/7/8MHz broadband of TV.
Because different modulation systems has influence on the operational environment of inserter, rise and can walk fixed mode process mode.Such as when Design of Signal, when knowing that very much the modulation system of downlink data signal is identical modulation system with Digital Television downstream signal, can consider that inserter loaded MAP periodic signal before exciter; If when the modulation system of downlink data signal is different identical modulation system from Digital Television downstream signal, can consider that inserter loads MAP periodic signal after exciter.
S205, be loaded on MAP periodic signal based on inserter control figure TV downstream signal, downlink data signal and upstream data. signals in digital television system;
In the process, Digital Television downstream signal, downlink data signal and upstream data. signals is entered at a MAP cycle interpolation.
Fig. 3 is existing MAP periodic structure schematic diagram, based in the communication technology of TDMA, usually adopts the mode in MAP cycle to realize.General principle is that the MAP cycle is divided into descender and ascender, altogether two parts.Descender is used for transmitting descending data and control information, and ascender is used for transmitting up information and request etc.
The MAP periodic structure schematic diagram of downstream television signals is loaded as shown in Figure 4 within the MAP cycle.Be divided into that digital television signal is descending, data downstream and data uplink three parts.Terminal needs to be needs reservations when upstream data.But the descending of digital television signal does not need reservation, controlled by network.Network determines the number of the tricks of the program of the Digital Television transmitted on a TV frequency by the time that control figure TV downstream signal takies.
And the length of the time slot of control figure TV downstream signal; Control the length of the time slot of downlink data signal; Control length of the time slot of upstream data. signals etc.
S206, by load after MAP periodic signal carry out duplex communication based on TDMA mode.
Accordingly, Fig. 5 shows the digital television system structural representation in the embodiment of the present invention, and this system comprises:
Inserter, is loaded into MAP periodic signal for control figure TV downstream signal, downlink data signal and upstream data. signals;
Communication module, for carrying out duplex communication by the MAP periodic signal after loading based on TDMA mode.
This inserter is also for entering Digital Television downstream signal, downlink data signal and upstream data. signals at a MAP cycle interpolation.And inserter is also for the length of the time slot of control figure TV downstream signal; Control the length of the time slot of downlink data signal; Control the length of the time slot of upstream data. signals.
It should be noted that, this system also comprises:
Modulation parsing module, for resolving the modulation system of downlink data signal and Digital Television downstream signal;
Modulation judge module, for judging that whether the modulation system of described downlink data signal is identical with the modulation system of described Digital Television downstream signal;
Modulation treatment module, for when judging that the modulation system of described downlink data signal is identical with the modulation system of described Digital Television downstream signal, then controlled inserter before exciter, loads MAP periodic signal; When judging that the modulation system of described downlink data signal is different from the modulation system of described Digital Television downstream signal, then control inserter after exciter, load MAP periodic signal.
The modulation system of this downlink data signal is OFDM OFDMA modulation system or is single-carrier modulated mode; The modulation system of described Digital Television downstream signal is OFDMA modulation system or is single-carrier modulated mode; Described upstream data. signals adopts single-carrier modulated mode or is the modulation system of multiple channel by the frequency frequency division in the 6/7/8MHz broadband of TV.
Fig. 6 to Fig. 9 shows and specifically practices scene mode in the embodiment of the present invention, Fig. 6 is existing digital television system structural representation, it is by encoder editor signal source, is sent by digital television signal entering into multiplexer, exciter and transmitter.
Fig. 7 shows the digital television system structural representation be applied in the embodiment of the present invention, if downlink data signal adopts the modulation system of Digital Television, just inserts before digital television modulator, namely before exciter, completes insertion process.Insertion process can use an inserter to realize.Inserter is responsible for the length of control figure TV time slot, the time slot of downlink data signal and the time slot of upstream data. signals.
Fig. 8 shows the digital television system structural representation be applied in the embodiment of the present invention, if downlink data signal adopts the modulation system being different from Digital Television, just inserts after digital television modulator, namely after exciter, completes insertion process.Insertion process can use an inserter to realize.Inserter is responsible for the length of control figure TV time slot, the time slot of downlink data signal and the time slot of upstream data. signals.
Fig. 9 shows the inserter structural representation be applied in the embodiment of the present invention, and inserter is actually one is carried out data source switching device according to the time that the MAP cycle is given.
To sum up, the embodiment of the present invention by loading digital television signal and data-signal at MAP periodic signal, thus completes communication based on TDMA, has ensured that Digital Television and data communication are transmitted simultaneously, achieve digital television bidirectional, solve the difficulty in spectrum allocation may and managerial difficulty.In whole implementation process, adopt narrow-band technologies can be applicable to the covering on a large scale of digital television signal, low speed, low cost and low-power consumption.In the process, the descending holding time of Digital Television, data downstream holding time and data uplink holding time can dynamic assignment, to meet the demand of practical application.If the demand of transfer of data is higher, just can reduce the Digital Television descending time taken, thus reduce the tricks of a TV frequency transmitting digital TV program.Meanwhile, the time of transfer of data just increases relatively, thus can transmit more data.
Above the method for the transmitting digital TV signal that the embodiment of the present invention provides and digital television system are described in detail, apply specific case herein to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. a method for transmitting digital TV signal, is characterized in that, comprises the steps:
Digital television system is loaded on MAP periodic signal based on inserter control figure TV downstream signal, downlink data signal and upstream data. signals;
MAP periodic signal after loading is carried out duplex communication based on TDMA mode.
2. the method for transmitting digital TV signal as claimed in claim 1, it is characterized in that, described being loaded on MAP periodic signal based on inserter control figure TV downstream signal, downlink data signal and upstream data. signals in digital television system comprises:
Digital Television downstream signal, downlink data signal and upstream data. signals is entered at a MAP cycle interpolation.
3. the method for transmitting digital TV signal as claimed in claim 2, it is characterized in that, described being loaded on MAP periodic signal based on inserter control figure TV downstream signal, downlink data signal and upstream data. signals in digital television system comprises:
The length of the time slot of control figure TV downstream signal;
Control the length of the time slot of downlink data signal;
Control the length of the time slot of upstream data. signals.
4. the method for the transmitting digital TV signal as described in any one of claims 1 to 3, it is characterized in that, described be loaded on MAP periodic signal based on inserter control figure TV downstream signal, downlink data signal and upstream data. signals in digital television system before also comprise:
Resolve the modulation system of downlink data signal and Digital Television downstream signal;
Judge that whether the modulation system of described downlink data signal is identical with the modulation system of described Digital Television downstream signal;
When judging that the modulation system of described downlink data signal is identical with the modulation system of described Digital Television downstream signal, then controlled inserter before exciter, load MAP periodic signal; When judging that the modulation system of described downlink data signal is different from the modulation system of described Digital Television downstream signal, then control inserter after exciter, load MAP periodic signal.
5. the method for transmitting digital TV signal as claimed in claim 4, is characterized in that, the modulation system of described downlink data signal is OFDMA modulation system or is single-carrier modulated mode; The modulation system of described Digital Television downstream signal is OFDMA modulation system or is single-carrier modulated mode; Described upstream data. signals adopts single-carrier modulated mode or is the modulation system of multiple channel by the frequency frequency division in the 6/7/8MHz broadband of TV.
6. a digital television system, is characterized in that, described system comprises:
Inserter, is loaded into MAP periodic signal for control figure TV downstream signal, downlink data signal and upstream data. signals;
Communication module, for carrying out duplex communication by the MAP periodic signal after loading based on TDMA mode.
7. digital television system as claimed in claim 6, it is characterized in that, described inserter is also for entering Digital Television downstream signal, downlink data signal and upstream data. signals at a MAP cycle interpolation.
8. digital television system as claimed in claim 7, it is characterized in that, described inserter is also for the length of the time slot of control figure TV downstream signal; Control the length of the time slot of downlink data signal; Control the length of the time slot of upstream data. signals.
9. the digital television system as described in any one of claim 6 to 8, is characterized in that, described system also comprises:
Modulation parsing module, for resolving the modulation system of downlink data signal and Digital Television downstream signal;
Modulation judge module, for judging that whether the modulation system of described downlink data signal is identical with the modulation system of described Digital Television downstream signal;
Modulation treatment module, for when judging that the modulation system of described downlink data signal is identical with the modulation system of described Digital Television downstream signal, then controlled inserter before exciter, loads MAP periodic signal; When judging that the modulation system of described downlink data signal is different from the modulation system of described Digital Television downstream signal, then control inserter after exciter, load MAP periodic signal.
10. digital television system as claimed in claim 9, is characterized in that, the modulation system of described downlink data signal is OFDMA modulation system or is single-carrier modulated mode; The modulation system of described Digital Television downstream signal is OFDMA modulation system or is single-carrier modulated mode; Described upstream data. signals adopts single-carrier modulated mode or is the modulation system of multiple channel by the frequency frequency division in the 6/7/8MHz broadband of TV.
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| CN201510509084.6A CN105120303A (en) | 2015-08-19 | 2015-08-19 | Method for transmitting digital TV signal and digital TV system |
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| CN201510509084.6A CN105120303A (en) | 2015-08-19 | 2015-08-19 | Method for transmitting digital TV signal and digital TV system |
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| CN201510509084.6A Pending CN105120303A (en) | 2015-08-19 | 2015-08-19 | Method for transmitting digital TV signal and digital TV system |
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