CN105847872A - Ultra-high definition digital television signal emitter capable of increasing television program's resolutions - Google Patents
Ultra-high definition digital television signal emitter capable of increasing television program's resolutions Download PDFInfo
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- CN105847872A CN105847872A CN201610222596.9A CN201610222596A CN105847872A CN 105847872 A CN105847872 A CN 105847872A CN 201610222596 A CN201610222596 A CN 201610222596A CN 105847872 A CN105847872 A CN 105847872A
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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
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
-
- 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]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/414—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
- H04N21/41422—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance located in transportation means, e.g. personal vehicle
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/47—End-user applications
- H04N21/488—Data services, e.g. news ticker
- H04N21/4882—Data services, e.g. news ticker for displaying messages, e.g. warnings, reminders
Abstract
The invention relates to an ultra-high definition digital television signal emitter capable of increasing television program's resolutions. The emitter comprises a packing and reusing module, an input pre-treating module, an error correction coding module, a convolution interlacing module, a channel processing module, and a digital upconversion processing module. The packing and reusing module receives ultra-high definition digital audio and video data, packs the data and reuses the data. The input pre-treating module, the error correction coding module, the convolution interlacing module, the channel processing module, and the digital upconversion processing module are connected successively to conduct pre-treating, error correction coding, convolution interlacing, channel processing and digital upconversion processing to the transmission streams outputted from the packing and reusing module with the result of obtaining radio frequency signals required of the emitting antenna of the emitter. According to the invention, the emitter is capable of providing a suitable channel carrier and a zipping and coding tool for high definition audios and videos, which meets viewers' requirement for video and audio programs with high resolutions.
Description
Technical field
The present invention relates to ultra high-definition digital TV field, particularly relate to a kind of terrestrial channel transmission ultra high-definition DTV letter
Number transmitter.
Background technology
TV is the important tool that the mankind understand the world, recreation, surveillance monitor, and in the development of TV tech, one opens
Begin pursuit is to obtain most contents as far as possible, therefore occurs in that DTV replaces the development trend of simulated television, but,
Along with development and the raising of people's living standard of science and technology, people have been unsatisfactory for the diversified demand to content, start
Concern information quality itself, i.e. wishes to obtain more and more high-resolution video data and voice data and other data, comes
Meet the demand on individual's sense organ.
But, in more existing HDTVs, the limit that resolution is not enough by data compression ratio, channel transmission bandwidth is less
System, i.e. allows to design video image and the audio frequency of ultra high-definition resolution, such as the image of 15360 × 8640 resolution, often
The audio signal of the sample rate of sound channel 48KHz, but owing to compression is inadequate and the restriction of existing channel transmission mode, cause nothing
Method sends and receives ultra high-definition digital television signal, and the audio-video signal that resolution can only be selected relatively low is watched, even if
The video image of ultra high-definition resolution and the technology of audio frequency itself have developed into ripe.
Accordingly, it would be desirable to the transmitter of a kind of terrestrial channel transmission of ultra high definition digital television signal, transform original channel and pass
Defeated mechanism, uses the higher Audio data compression pattern of data compression and video data compression pattern, for ultra high-definition resolution
Video image and the transmission of audio frequency create conditions, use terrestrial television channel transmission means, even if at mobile traffic simultaneously
Televiewer in instrument, is also provided that video content and the audio content of ultra high-definition resolution.
Summary of the invention
In order to solve the problems referred to above, the invention provides the transmitting of a kind of terrestrial channel transmission of ultra high definition digital television signal
Machine, uses spatial audio coding SAC coding that ultra high-definition digital audio and video signals is compressed coding, uses efficient video coding
HEVC coding is compressed coding to ultra high-definition digital video signal, has transformed original terrestrial television channel transmission skill simultaneously
Art, the transmission for ultra high-definition TV creates condition so that televiewer can not only receive increasing TV programme, and
Substantially increasing the resolution of the TV programme of reception, the sense organ for televiewer provides perfect seeing and hearing enjoyment.
According to an aspect of the present invention, it is provided that the transmitter of a kind of terrestrial channel transmission of ultra high definition digital television signal,
Including, ultra high-definition digital audio capture module, ultra high-definition Digital Video collection module, coding additional data acquisition module, packing
Multiplexing module, input pretreatment module, Error Correction of Coding module, convolutional interleave module, channel processing module, Digital Up Convert process
Module, packaging multiplexing module and ultra high-definition digital audio capture module, ultra high-definition Digital Video collection module, coding additional data
Acquisition module connects to receive compression voice data respectively, compress voice data and encode additional data and carry out packaging multiplexing,
Input pretreatment module, Error Correction of Coding module, convolutional interleave module, channel processing module, Digital Up Convert processing module are successively
Connect the transport stream TS stream so that packaging multiplexing module to be exported to carry out successively inputting pretreatment, Error Correction of Coding, convolutional interleave, channel
Process and numeral upconversion process, it is thus achieved that the radiofrequency signal needed for antenna is launched launched by transmitter.
The method of work of the transmitter of described terrestrial channel transmission of ultra high definition digital television signal, including: ultra high-definition numeral
Audio collection module, gathers the audio signal that the audio-source of ultra high-definition 22 sound channel is play, and depends on the audio signal collected
Secondary analog digital conversion, the compressed audio coding of carrying out, output squeezing voice data, being arranged as of described 22 sound channels, at hearer place
In space, intermediate layer is provided with 10 sound channels, and bottom is provided with 3 sound channels, and top layer is provided with 9 sound channels；Ultra high-definition numeral regards
Frequently acquisition module, gathers and employs the video signal that the ultra high-definition video source of ultra high-definition TV resolution is play, and to collection
To video signal carry out analog digital conversion, video compression coding, output squeezing video data successively；Coding additional data obtains mould
Block, is acquired the additional data from additional data source, and the additional data collected is compressed coding, output pressure
Reducing the staff the coding additional data after code, described additional data includes the data of independent data service, also includes and described audio frequency
The data that signal, described video signal are relevant；Packaging multiplexing module, connects described ultra high-definition digital audio capture module, described
Ultra high-definition Digital Video collection module and described coding additional data acquisition module, to the compression voice data received, compression
Video data and coding additional data are transmitted flowing TS packing respectively, to obtain audio TS bag, video TS bag respectively and to add
Data TS bag, and described audio TS bag, video TS bag and additional data TS bag are carried out multiplexing, it is thus achieved that the TS stream after multiplexing, institute
State TS stream and there is the MPEG-2 frame structure of 188 bytes；Input pretreatment module, connects described packaging multiplexing module described to receive
Transport stream TS stream after multiplexing, and the transport stream TS flow point after described multiplexing is slit into multiple logical data stream, export described many
Individual logical data stream；Error Correction of Coding module, connects described input pretreatment module, and the logical data stream received is used ISN
It is that the Error Correction of Coding pattern that low-density checksum LDPC encodes carries out Error Correction of Coding for reed-solomon RS coding, outer code；Volume
Long-pending interleaving block, connects described Error Correction of Coding module, the data stream after the Error Correction of Coding received is carried out the volume that the degree of depth is 12
Long-pending interweave, to obtain the byte after convolutional interleave；Channel processing module, connects described convolutional interleave module, to the volume received
Byte after long-pending intertexture carries out OFDM modulation successively, data slice generates, OFDM frame generates and numeral pre-distortion, and output is digital
Digital signal after pre-distortion, in data slice generation processes, is mapped to one by the bit stream obtained through OFDM modulation
Organize adjacent OFDM subcarrier using as a data slice；Digital Up Convert processing module, connects described channel processing module, will
Digital signal after the digital pre-distortion received processes is converted into analogue signal, carries out the analogue signal after conversion at mixing
Manage the radiofrequency signal of the higher mid frequency of mid frequency of the analogue signal after having than described conversion with acquisition, and will obtain
Radiofrequency signal be amplified and limit bandwidth；Launch antenna, connect described Digital Up Convert processing module to receive through putting
Big and limit the radiofrequency signal of bandwidth to launch ultra high-definition digital television signal in terrestrial channel；Wherein, described ultra high-definition number
The sample rate of the collection of word audio collection module is every sound channel 44.1KHz, described ultra high-definition digital audio capture module sound intermediate frequency
Compressed encoding uses spatial audio coding SAC coding, and ultra high-definition TV resolution has three kinds: 3840 × 2160,7680 ×
4320 or 15360 × 8640, in described ultra high-definition Digital Video collection module, video compression coding uses efficient video volume
Code HEVC coding；Wherein, described audio TS bag, video TS bag and additional data TS bag have different PID Packet Identifier PID, described
PID be used to as multiplexing after TS stream in the identifier of different types of data bag distribution different value, described TS stream is by packet header and negative
Carrying composition, described packet header includes a sync byte SYNC1 and three other bytes, and described three other bytes are known for business
Not, scrambling and control information, described load includes the MPEG-2 data of 184 bytes, three other bytes in described TS stream packet header
Be specifically distributed as, 1 transmission error code indication bit position, 1 clean data cell initiates indication bit position, and 1 is transmitted priority
Bit, 13 bag identifier PID bits, 2 are transmitted scrambling control bits position, 2 self adaptation district control bits and 4
Continuous counter bit.
Further: described channel processing module includes OFDM manipulator, to realize in described channel processing module
OFDM modulation function, before described OFDM manipulator includes a liter employing processing unit, fast Fourier transform unit, interpolation circulation
Suffix unit and windowing unit, sew before and after input signal carries out a liter sampling processing, fast fourier transform conversion, interpolation circulation
And windowing process.
Further: the signal that described transmitter is launched is for including the locomotive of taxi, bus or family car
The reception of the receiver of the terrestrial channel transmission of ultra high definition digital television signal on.
Further: described additional data is caption data.
Accompanying drawing explanation
Below with reference to accompanying drawing, embodiment of the present invention are described, wherein:
The structure side of the transmitter of the terrestrial channel transmission of ultra high definition digital television signal that Fig. 1 illustrates according to an embodiment of the present invention
Block diagram.
Wherein, 1, ultra high-definition digital audio capture module；2, ultra high-definition Digital Video collection module；3, coding additional data
Acquisition module；4, packaging multiplexing module；5, input pretreatment module；6, Error Correction of Coding module；7, convolutional interleave module；8, channel
Processing module；9, Digital Up Convert processing module；10, antenna is launched.
Detailed description of the invention
Enforcement to the transmitter of the terrestrial channel transmission of ultra high definition digital television signal of the present invention below with reference to accompanying drawings
Scheme is described in detail.
Fig. 1 illustrates the transmitter of the terrestrial channel transmission of ultra high definition digital television signal illustrated according to an embodiment of the present invention
Block diagram.Wherein said transmitter includes, ultra high-definition digital audio capture module 1, ultra high-definition Digital Video collection mould
Block 2, coding additional data acquisition module 3, packaging multiplexing module 4, input pretreatment module 5, Error Correction of Coding module 6, convolution are handed over
Knit module 7, channel processing module 8, Digital Up Convert processing module 9, packaging multiplexing module 4 and ultra high-definition digital audio capture mould
Block 1, ultra high-definition Digital Video collection module 2, coding additional data acquisition module 3 connect to receive respectively compression voice data,
Compressing voice data and coding additional data and carry out packaging multiplexing, input pretreatment module 5, Error Correction of Coding module 6, convolution are handed over
Knit module 7, channel processing module 8, Digital Up Convert processing module 9 are sequentially connected with the transmission to export packaging multiplexing module 4
Stream TS stream carries out inputting pretreatment, Error Correction of Coding, convolutional interleave, Channel Processing and numeral upconversion process successively, it is thus achieved that launch
Machine is launched antenna 10 and is launched required radiofrequency signal.Further, described terrestrial channel transmission of ultra high definition digital television signal
Transmitter also includes, ultra high-definition digital audio capture module 1, gathers the audio frequency letter that the audio-source of ultra high-definition 22 sound channel is play
Number, and the audio signal collected is carried out successively analog digital conversion, compressed audio coding, and output squeezing voice data, described 22
Being arranged as of sound channel, in the space at hearer place, intermediate layer is provided with 10 sound channels, and bottom is provided with 3 sound channels, and top layer sets
9 sound channels are put；Ultra high-definition Digital Video collection module 2, gathers the ultra high-definition video source employing ultra high-definition TV resolution
The video signal play, and the video signal collected is carried out successively analog digital conversion, video compression coding, output squeezing regards
Frequency evidence；Coding additional data acquisition module 3, is acquired the additional data from additional data source, and to collecting
Additional data is compressed coding, and the coding additional data after output squeezing coding, described additional data includes independent data
The data of business, also include the data relevant with described audio signal, described video signal；Packaging multiplexing module 4, connects described
Ultra high-definition digital audio capture module 1, described ultra high-definition Digital Video collection module 2 and described coding additional data acquisition module
3, it is transmitted respectively the compression voice data received, compressed video data and coding additional data flowing TS packing, to divide
Not Huo get audio TS bag, video TS bag and additional data TS bag, and to described audio TS bag, video TS bag and additional data TS bag
Carry out multiplexing, it is thus achieved that the TS stream after multiplexing, described TS stream has the MPEG-2 frame structure of 188 bytes；Input pretreatment module 5,
Connect described packaging multiplexing module 4 to receive the transport stream TS stream after described multiplexing, and by the transport stream TS stream after described multiplexing
It is divided into multiple logical data stream, exports the plurality of logical data stream；Error Correction of Coding module 6, connects described input pretreatment
Module 5, it is that reed-solomon RS encodes, outer code is low-density checksum LDPC that the logical data stream received uses ISN
The Error Correction of Coding pattern of coding carries out Error Correction of Coding；Convolutional interleave module 7, connects described Error Correction of Coding module 6, to receive
Data stream after Error Correction of Coding carries out the convolutional interleave that the degree of depth is 12, to obtain the byte after convolutional interleave；Channel processing module
8, connect described convolutional interleave module 7, the byte after the convolutional interleave received is carried out successively OFDM modulation, data slice life
Become, OFDM frame generates and numeral pre-distortion, the digital signal after output digital pre-distortion process, processes in data slice generation
In, the bit stream obtained through OFDM modulation is mapped to one group of adjacent OFDM subcarrier using as a data slice；Numeral
Upconversion process module 9, connects described channel processing module 8, and the digital signal after being processed by the digital pre-distortion received turns
Change analogue signal into, the analogue signal after conversion is carried out Frequency mixing processing to obtain the analogue signal after having than described conversion
The radiofrequency signal of the higher mid frequency of mid frequency, and the radiofrequency signal of acquisition is amplified and limits bandwidth；Launch sky
Line 10, connects described Digital Up Convert processing module 9 to receive through amplifying and limiting the radiofrequency signal of bandwidth to believe on ground
Road is launched ultra high-definition digital television signal；Wherein, the sample rate of the collection of described ultra high-definition digital audio capture module 1 is every
Sound channel 44.1KHz, described ultra high-definition digital audio capture module 1 sound intermediate frequency compressed encoding uses spatial audio coding SAC
Coding, ultra high-definition TV resolution has three kinds: 3840 × 2160,7680 × 4320 or 15360 × 8640, described ultra high-definition numeral
In video acquisition module 2, video compression coding uses efficient video coding HEVC coding；Wherein, described audio TS bag, regard
Frequently TS bag and additional data TS bag have different PID Packet Identifier PID, described PID be used to as multiplexing after TS stream in inhomogeneity
The identifier of type allocation of packets different value, described TS stream is made up of packet header and load, and described packet header includes a sync byte
SYNC1 and three other bytes, described three other bytes are used for traffic identification, scramble and control information, and described load includes
The MPEG-2 data of 184 bytes, being specifically distributed as of three other bytes in described TS stream packet header, 1 transmission error code instruction ratio
Special position, 1 clean data cell initiates indication bit position, and 1 is transmitted priority bit position, 13 bag identifier PID bits, and 2
Individual transmission scrambling control bits position, 2 self adaptation districts control bit and 4 continuous counter bits.
Wherein, resolution (resolution, also referred to as resolution) is exactly the precision of screen picture, refers to display
Can display pixel number.Owing to the point on screen, line dough-making powder are all made up of pixel, the displayable pixel of display
The most, picture is the finest, and the information that can show in same screen area is the most, so resolution is individual very important
One of performance indications.Whole image can be imagined as being a large-scale chessboard, and the representation of resolution owns exactly
Warp and the number in parallel cross point.
Wherein, Reed-Solomon, commonly referred to RS code, is a kind of Linear codes Cyclic Redundancy Code.In RS code after coding
Data generally include data message and control information.And information is not to carry out processing with bit position in RS code, but with
Sign bit in numerical digit bit one code of composition processes.The generally multiple for 8bits or 8bits of the length of coded identification.
So design is to carry out mutual phase transformation for the ease of the word length in same computer.Assume in the RS code packet of an a length of N
Comprise I information symbol, P correction symbol, then I information symbol in packet can be corrected by the decoding process of RS code
In t=P/2 mistake, if it is known that errors present, then can correct P mistake.
Wherein, audio sample rate refers to the sound pick-up outfit sampling number to acoustical signal in a second, and sample frequency is more
The reduction of high sound is the truest more natural.On current main flow capture card, sample frequency be typically divided into 22.05KHz,
44.1KHz, 48KHz Three Estate, 22.05KHz can only achieve the sound quality of FM broadcast, and 44.1KHz is then theoretic CD
Tonequality boundary, 48KHz is the most accurate.Cannot be discernable for the sample frequency human ear higher than 48KHz, so
It is not much use value on computers.
Wherein, LDPC code i.e. low density parity check code (Low Density Parity Check Code, LDPC), he
It is the linear block codes in the class that 1963 propose by Robert doctor G.Gallager with sparse check matrix, not only
Having the superperformance approaching Shannon limit, and decoding complexity is relatively low, flexible structure, is the grinding of field of channel coding in recent years
Study carefully focus, be widely used to the fields such as deep space communication, fiber optic communication, satellite digital video and audio broadcasting at present.LDPC code
Become forth generation communication system (4G) strong competitor, and encoding scheme based on LDPC code is by satellite of future generation
Digital video-frequency broadcast standard DVB-S2 adopts.
It addition, the transmitter of described terrestrial channel transmission of ultra high definition digital television signal farther includes: at described channel
Reason module 8 includes OFDM manipulator, and to realize the OFDM modulation function in described channel processing module 8, described OFDM modulates
Device sews unit and windowing unit, to input before and after including a liter employing processing unit, fast Fourier transform unit, interpolation circulation
Signal is sewed and windowing process before and after carrying out a liter sampling processing, fast fourier transform conversion, interpolation circulation.
Wherein, OFDM(Orthogonal Frequency Division Multiplexing) i.e. OFDM skill
Art, actually OFDM are MCM Multi-CarrierModulation, the one of multi-carrier modulation, and its main thought is: will letter
Road is divided into some orthogonal sub-channels, and high-speed data signal is converted into parallel low speed sub data flow, and modulation is believed at every height
It is transmitted on road.Orthogonal signalling can by receiving terminal use correlation technique come separately, so can reduce subchannel it
Between interfere ICI.Signal bandwidth on every sub-channels less than the correlation bandwidth of channel, therefore on every sub-channels can
To regard flatness decline as, such that it is able to eliminate intersymbol interference.And owing to the bandwidth of every sub-channels is only former channel
The sub-fraction of bandwidth, channel equalization becomes relatively easy.
It addition, the transmitter of described terrestrial channel transmission of ultra high definition digital television signal farther includes: described transmitter
The signal launched is for including the terrestrial channel transmission ultra high-definition number on the mobile vehicle of taxi, bus or family car
The reception of the receiver of word TV signal.
It addition, the transmitter of described terrestrial channel transmission of ultra high definition digital television signal farther includes: described additional number
According to for caption data.At television reception end, it is possible to caption data and video data are carried out overlapping display, provides for TV user
Such as contents such as emergency alarm, guide, advertisements, to meet the various needs of television operator.
Use the transmitter of the terrestrial channel transmission of ultra high definition digital television signal of the present invention, in existing television transmission
Because data compression ratio not, the technical problem that limits of multi-channel transport mechanism, for big data ultra high-definition digital audio and video signals and
Ultra high-definition digital video signal selects suitable tool of compression, transforms existing terrestrial transmission mechanism to meet ultra high-definition number simultaneously
The requirement of word television signal transmission, is that the TV user including mobile TV spectators provides high-quality, high-resolution audio frequency and video
Content, thus improve the quality of the life of people.
Claims (1)
1. the method for work of the transmitter of a terrestrial channel transmission of ultra high definition digital television signal, it is characterised in that described
The machine of penetrating includes: ultra high-definition digital audio capture module, ultra high-definition Digital Video collection module, coding additional data acquisition module,
Packaging multiplexing module, input pretreatment module, Error Correction of Coding module, convolutional interleave module, channel processing module, Digital Up Convert
Processing module, packaging multiplexing module is added with ultra high-definition digital audio capture module, ultra high-definition Digital Video collection module, coding
Data acquisition module connection is to receive compression voice data, compression voice data and coding additional data respectively and to carry out packing again
With, input pretreatment module, Error Correction of Coding module, convolutional interleave module, channel processing module, Digital Up Convert processing module depend on
Secondary connection carries out inputting pretreatment, Error Correction of Coding, convolutional interleave, letter with the transport stream TS stream exporting packaging multiplexing module successively
Road processes and numeral upconversion process, it is thus achieved that the radiofrequency signal needed for antenna is launched launched by transmitter；
Described method of work, including:
Ultra high-definition digital audio capture module, gathers the audio signal that the audio-source of ultra high-definition 22 sound channel is play, and to collection
To audio signal carry out analog digital conversion, compressed audio coding successively, output squeezing voice data, being arranged as of 22 sound channels,
In the space at hearer place, intermediate layer is provided with 10 sound channels, and bottom is provided with 3 sound channels, and top layer is provided with 9 sound channels；
Ultra high-definition Digital Video collection module, gathers regarding of employing that the ultra high-definition video source of ultra high-definition TV resolution play
Frequently signal, and the video signal collected is carried out successively analog digital conversion, video compression coding, output squeezing video data；
Coding additional data acquisition module, is acquired the additional data from additional data source, and additional to collect
Data are compressed coding, and the coding additional data after output squeezing coding, described additional data includes independent data service
Data, also include the data relevant with described audio signal, described video signal；
Packaging multiplexing module, connect described ultra high-definition digital audio capture module, described ultra high-definition Digital Video collection module and
Described coding additional data acquisition module, divides the compression voice data received, compressed video data and coding additional data
It is not transmitted flowing TS packing, to obtain audio TS bag, video TS bag and additional data TS bag respectively, and to described audio TS
Bag, video TS bag and additional data TS bag carry out multiplexing, it is thus achieved that the TS stream after multiplexing, described TS stream has the MPEG-of 188 bytes
2 frame structures；
Input pretreatment module, connects described packaging multiplexing module to receive the transport stream TS stream after described multiplexing, and by described
Transport stream TS flow point after multiplexing is slit into multiple logical data stream, exports the plurality of logical data stream；
Error Correction of Coding module, connects described input pretreatment module, and the logical data stream received is used ISN is Reed institute
Sieve door RS coding, outer code are that the Error Correction of Coding pattern of low-density checksum LDPC coding carries out Error Correction of Coding；
Convolutional interleave module, connects described Error Correction of Coding module, the data stream after the Error Correction of Coding received is carried out the degree of depth and is
The convolutional interleave of 12, to obtain the byte after convolutional interleave；
Channel processing module, connects described convolutional interleave module, and the byte after the convolutional interleave received carries out OFDM successively
Modulation, data slice generate, OFDM frame generates and numeral pre-distortion, export the digital signal after digital pre-distortion processes,
During data slice generation processes, the bit stream obtained through OFDM modulation is mapped to one group of adjacent OFDM subcarrier using as one
Individual data slice；
Digital Up Convert processing module, connects described channel processing module, the numeral after being processed by the digital pre-distortion received
Signal is converted into analogue signal, the analogue signal after conversion carries out Frequency mixing processing to obtain the simulation after having than described conversion
The radiofrequency signal of the higher mid frequency of mid frequency of signal, and the radiofrequency signal of acquisition is amplified and limits bandwidth；
Launch antenna, connect described Digital Up Convert processing module with receive through amplification and limit bandwidth radiofrequency signal with
Terrestrial channel is launched ultra high-definition digital television signal；
Wherein, described audio TS bag, video TS bag and additional data TS bag have different PID Packet Identifier PID, and described PID is to use
The identifier of different types of data bag distribution different value in TS stream after coming for multiplexing, described TS stream is made up of packet header and load,
Described packet header includes a sync byte SYNC1 and three other bytes, and described three other bytes are used for traffic identification, scrambling
With the information of control, described load includes the MPEG-2 data of 184 bytes, concrete point of three other bytes in described TS stream packet header
Cloth is, 1 transmission error code indication bit position, and 1 clean data cell initiates indication bit position, and 1 is transmitted priority bit position, 13
Individual bag identifier PID bit, 2 are transmitted scrambling control bits position, and 2 self adaptation districts control bit and 4 continuous counters
Device bit；
Described channel processing module includes OFDM manipulator, to realize the OFDM modulation function in described channel processing module,
Described OFDM manipulator is sewed unit before and after including a liter employing processing unit, fast Fourier transform unit, interpolation circulation and adds
Window unit, sews and windowing process before and after input signal carries out a liter sampling processing, fast fourier transform conversion, interpolation circulation.
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| CN103259987B (en) | 2016-05-11 |
| CN103259987A (en) | 2013-08-21 |
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