CN1051193C - System for transmission of high distinctness TV by use of existing digital broadcast equipment - Google Patents
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- CN1051193C CN1051193C CN97100540A CN97100540A CN1051193C CN 1051193 C CN1051193 C CN 1051193C CN 97100540 A CN97100540 A CN 97100540A CN 97100540 A CN97100540 A CN 97100540A CN 1051193 C CN1051193 C CN 1051193C
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Abstract
The present invention relates to a system for transmitting high definition television signals by using the existing digital video broadcasting (DVB) apparatus. The transmitting end of the system comprises a plurality of common digital television encoders (3), a multiplexer (4), a signal channel coding and modulation circuit (5), a transmitting system (6), etc. The receiving end of the system comprises an integrated receiving decoder (7) which comprises a demodulation circuit (71), a demultiplexer (72), a common digital television video decoder (73), an audiodecoder (74), etc. An A/D converter (1), an image divider(2), a controller (9), etc. are additionally arranged on the transmitting end, and an image joint circuit (75) and a D/A conversion and post-processing circuit (76) are additionally arranged in the integrated receiving decoder of the receiving end. Thus, high definition television signals can be transmitted by the existing digital video broadcasting (DVB) apparatus after being divided by the transmitting end and jointed by the receiving end.
Description
The present invention relates to high definition TV (HDTV) system, relate more specifically to utilize the system of existing digital video broadcasting (DVB) device transmission high definition TV.
Video broadcasting is a kind of information broadcast of High Data Rate, and high definition TV is because the resolution height, and its information content is bigger.For example a kind of digital high-definition television interface signalling format that proposes in 1TU-R BT.1120 suggestion is: full images form is 1728*1250/50/2: 1, and the efficient image pixel is 1440*1152, the bandwidth of each analog component signal is 27MHz.For this wideband video signal, at present consistently think and it should be carried out digital compression, it can be transmitted, so that utilize the frequency space fully with narrower bandwidth.If adopt the 54MHz sample rate to sample to this signal, carrier chrominance signal sample rate ratio is 4: 2: 0, and then the aggregate date rate after its digitlization is about 650Mbps.Usually the compression method that adopts is the video-frequency compression method among the MPEG2 at present, wherein the processing of carrying out has estimation, motion compensation, dct transform, quantification, variable-length encoding etc., to carry out the processing of these complexity to the huge data volume of high definition TV, then require the disposal ability of equipment very powerful.And present device level still can not realize low-cost and practical high definition TV encoding device.In addition, although coding is simple in the processing of decoded portion,, still can't obtain to satisfy the receiving equipment of consuming capacity owing to the big data quantity of high definition TV and the level of device.
At present, ordinary numbers video broadcasting (DVB) is introduced to the market, and its relevant technology, device etc. are ripe, and transmission standard (DVB satellite, cable etc.) works out out.The receiving equipment of lower cost makes consumption reach scale, and the scale of consumption further makes the cost of equipment reduce.
In DVB broadcasting, present compression and modulation technique have been implemented in transmission four tunnel ordinary numbers TV programme in the common simulation television channel.Its system configuration such as Fig. 1.
In the DVB of Fig. 1 broadcast system, four road normal tv signals carry out digital coding by four ordinary numbers television encoders 3 respectively, encoded data are delivered to multiplexer 4, carry out chnnel coding and modulation by chnnel coding and modulation circuit 5 then, deliver to emission system 6 emissions at last.Channel can be satellite, cable or terrestrial broadcasting etc.At receiving terminal, receive by Integrated Receive Decoder (IRD) 7, it comprises demodulator circuit 71, is used for the demodulation of chnnel coding; Demodulation multiplexer 72 is used for four multiplexing way word TV signal are separated into four independently digital television signals; Ordinary numbers television video decoder 73 is used for the digital television signal of having encoded is decoded as original normal tv signal; Audio decoder 74 carries out audio decoder.Vision signal and audio signal by above-mentioned ordinary numbers television video decoder 73 and audio decoder 74 decodings are delivered to demonstration on the display device 8.
To the more detailed description of above-mentioned background technology, can referring to document " All-Digital HDTV and DVB " (Zheng Zhihang writes, Beijing: Chinese radio and television publishing house, 1997 the 1st edition).
Because the consumption market of high definition TV does not start as yet at present, and low-cost practical high definition TV coding/decoding apparatus still is unrealized, and the consumption market that the high definition television broadcasting equipment that therefore requires the broadcaster to emit bigger risk to go to buy high price now starts high definition TV is unpractical.
The objective of the invention is to adopt image segmentation technique, utilize existing ordinary numbers television broadcast device, realize the broadcast transmitted of high definition TV at low cost.
Consider that the video compression technology that adopts in the DVB broadcasting also is the MPEG2 technology, and in digital video broadcasting, adopted the digital multiplexing technology.Therefore, the present invention has adopted make a start image Segmentation and receiving end image connection technology, realizes the high definition television broadcasting transmission on existing DVB broadcasting equipment basis.Utilize this system can be quickly, lower cost ground realizes the broadcasting of high definition TV promoting the development of high definition television broadcasting business and the developing of consumption market.
According to the system of existing digital video broadcasting (DVB) the device transmission high definition TV of the utilization of inventing, its transmitting terminal comprises a plurality of ordinary numbers television encoders, multiplexer, chnnel coding and modulation circuit, emission system; Its receiving terminal comprises Integrated Receive Decoder, and it comprises demodulator circuit, demodulation multiplexer, ordinary numbers television video decoder and audio decoder etc., it is characterized in that:
Its transmitting terminal also comprises: A/D converter, image Segmentation device and controller etc.
High definition television video signal becomes digital signal after handling through high definition TV A/D converter earlier, its output interface is connected with the image Segmentation device, the image Segmentation processor carries out dividing processing to the high definition TV digital video signal, form the experimental process video data stream, these sub video data streams are fed to a plurality of ordinary numbers television encoders and carry out the compressed encoding processing.The operating parameter of each encoder (quantization matrix for example, data transfer rate etc.) dispose and control by system controller, make each encoder have same timer reference of programs (PCB), and make each image subsection that belongs to same frame originally have same show time scale (PTS) and decoding markers (DTS)
Each sub-video code stream of coding is sent to multiplexer as program video compressed bit stream independently and carries out multiplexingly, and the parameter setting of system controller control control multiplexer is to satisfy the requirement of image Segmentation and splicing;
The Integrated Receive Decoder of its receiving terminal also comprises image connection circuit, D/A conversion and post processing circuitry, the image connection circuit receives the video decompression code stream obtain and carries out the splicing of image according to carve information wherein after demodulator circuit, demultiplexing circuit and a plurality of ordinary numbers television video coder processes, the video code flow that splicing is good is undertaken being sent to the high definition TV display device after the processing such as A/D conversion and filtering and shows by A/D conversion and post processing circuitry.
According to the system of the existing digital video broadcast device transmission of high distinctness TV of utilization of the present invention, it is characterized in that said image Segmentation device is that unit is divided into the image subsection that four suitable ordinary numbers television encoders of every frame are handled with the frame image with high definition television images.
Utilize the system that has the digital video broadcast device transmission of high distinctness TV now according to the present invention, it is characterized in that said image Segmentation device resembles high definition television images with field pattern be that unit is divided into the image subsection that two every suitable ordinary numbers television encoders are handled.
System according to the existing digital video broadcast device transmission of high distinctness TV of utilization of the present invention, it is characterized in that said image Segmentation device initial point from former high definition television images begins to extract out some pixels and forms the treatable image subsection of ordinary numbers television encoder, change sampling start-phase (being about to the level or the vertical starting point displacement of subsampling) then, carry out the extraction of image subsection again, repeat this operation, become several sampling rates identical former image Segmentation at last, but the different image subsection of phase place.
Below in conjunction with accompanying drawing embodiments of the invention are elaborated.
Fig. 1 is the block diagram of existing digital video broadcast system;
The block diagram of Fig. 2 radiating portion of the system of existing digital video broadcasting (DVB) device transmission high definition TV for the present invention utilizes; Fig. 3 is for utilizing the block diagram of receiving unit of the system of existing digital video broadcasting (DVB) device transmission high definition TV according to the present invention;
Fig. 4 is a frame image split plot design schematic diagram;
Fig. 5 is that field pattern resembles the split plot design schematic diagram;
Fig. 6 is a subsampling split plot design schematic diagram.
Referring to Fig. 2, in originator system,, increased high definition TV A/D converter 1, image Segmentation device 2 and controller 9 etc. based on existing DVB equipment.
High definition television video signal becomes digital signal after handling through A/D converter 1 earlier, its output interface form can adopt the reference format of ITU-R BT.1120, perhaps definition voluntarily, so that the structure of the image Segmentation device 2 of simplification back (for example, to go field sync signal) by the image Segmentation device of other signal wire transmits to the back, the extraction that can save row field signal like this.
Digital signal sends the image Segmentation processor to then, carries out dividing processing, and its concrete division processing method is described in detail later.The high definition TV digital video signal forms the experimental process video data stream after image Segmentation is handled, present embodiment is that high-definition TV signal is divided into four sub-video data streams, and these sub video data stream is given several ordinary numbers television encoders 3 by D1 or CCIR656 digital visual interface and other interface of ordinary numbers video coding equipment acceptable and carried out compressed encoding and handle.These condensing encoders are the original equipment of DVB.Each condensing encoder carries out compressed encoding with the sub-video code stream of input as program independently to be handled, uncorrelated mutually between them, is independence, parallel work-flow.The operating parameter of each encoder (for example quantization matrix, data transfer rate etc.) can be inequality, and this decides (describing in detail) by dividing method in the image Segmentation of back, and is configured and controls by system controller 9.
For can be together with the image connection cut apart in decoding end, same timer reference of programs (PCR) is provided for herein each encoder, will guarantees that simultaneously each image subsection that belongs to same frame originally has same PTS (show time scale) and DTS (decoding markers).
What each condensing encoder was exported is the MPaML compressed video stream that meets MPEG-2.
Each sub-video code stream of compression is sent to the original multiplexer 4 of DVB as program video compressed bit stream independently and carries out multiplexing.This input code flow is a PES stream (elementary stream of packing), wherein comprises PTS (show time scale), DTS (decoding markers) and PCR (timer reference of programs) equal time information.Controller control multiplexer adds the identification information of image Segmentation in transmitting stream.Identification information is used for the sign of each sub-video code stream of the sign of native system sign, dividing method and same program.Wherein, system identification information is used to identify the sign of native system, promptly indicate this code stream to produce by native system, this system identification information can leave the network information table (NIT that transmits stream (tranpsort stream) in, networks infor-mation table) in, this table is user-defined in MPEG-2.
Each video code flow that multiplexer will be imported carries out multiplexing process as the video flowing of several programs.This is because the multiplexer that uses in native system is the equipment of former DVB.In order the image subsection of cutting apart can be stitched together,, carry out some special soft settings by system controller 9, to satisfy the specific (special) requirements of native system on the basis of not changing existing equipment in receiving end.
These special processings are as follows: each video subcode stream of same high-definition television programs utilizes pat table (Program Association Table) and pmt table (Program Map Table) to identify, same program number (program-nrmber) is given in the PTD number mapping that is about to each video subcode stream of same high-definition television programs, just can pick up out each the video subcode stream that belongs to same program from multiplexing code stream in receiving end like this.The relativeness of each video subcode stream (being that certain video subcode stream is which part of former image) can arrange to identify to PID or stream-ID (as, frame image is divided into four, the PID of these four image subsections number respectively assignment be base-val-ue, base-value+1, base-value+2, base-value+3, wherein basevalue is 4 multiple, so just can identify the code stream of the image subsection that belongs to each position).
What multiplexer was exported is the transmission stream (tranport stream) that meets Moving Picture Experts Group-2.Wherein multiplexing is to meet other video code flow of MPEG-2 MPML level.These video code flows are sub-programs of one road high-definition television programs, but at the DVB existing equipment, it thinks that this is the several program.
The quantity of the ordinary numbers television encoder that No. one high definition TV uses is according to the difference of image partitioning method and difference, and concrete example provides in the description to image partitioning method below.
The transmission code stream (Transport stream) of multiplexer output gives the original channel encoder of DVB and channel modulator 5 carries out the chnnel coding modulation treatment.Radio equipment can be ground, cable or satellite channel equipment, decides according to existing equipment.Modulated signal is after original transmitter 6 carries out broadcast transmission.
Even the high definition TV audio signal has been used stereo or around new audio systems such as pieces, data volume also is less, so the problem of not cutting apart.The audio signal of No. one high definition TV can be inserted in any one tunnel the sub-program after cutting apart, is handled by audio coder 31, can not carry audio signal in other way program, only comprises video information.The compression of audio signal, multiplexing, demultiplexing, decompression etc. handle with DVB in processing just the same, and use original equipment fully.
The structure of receiving system as shown in Figure 3.This Integrated Receive Decoder (IRD) has increased image connection 75, the D/A conversion relevant with high definition TV and post processing circuitry 76, other circuit than the IRD of ordinary numbers TV, all use the original circuit board of DVB as demodulator circuit, demodulation multiplexer, Video Decoder etc., but will increase respective counts according to the method for image Segmentation.
Radiofrequency signal sends demodulation multiplexer 72 to after demodulator circuit 71 demodulation.Demodulation multiplexer 72 should at first identify the system banner of native system from network information table, to confirm that the code stream that receives is the code stream that native system can be handled and show.Demodulation multiplexer picks out the several video code flow according to PAT and pmt table branch then, here different with common Integrated Receive Decoder, should divide to pick out several video code flow (these code streams are each sub-video code streams of forming one road high-definition television programs) herein, rather than a tap one tunnel resembling in the ordinary numbers TV receiving apparatus.Demodulation multiplexer output PES stream (elementary stream of packing) wherein carries PTS and DTS information.
Demodulation multiplexer outputs to each sub-video code stream on the delivery outlet of appointment according to the relativeness that each the sub-video code stream that provides in the stream is provided simultaneously.
The PES code stream that these branches pick out is given each Video Decoder 73 and is carried out decompression, these Video Decoder 73 independent parallel ground work, but provide same fiducial time to it by system.Decoder extracts the timing information in the PES code stream simultaneously, with fiducial time relatively after, by the delay process of buffer, the video decompression code stream aimed at fiducial time of output.
The video code flow of decoding is input in the image connection circuit 75, and its signal format is D1 or CCIR656 or other signal format by the design of decoder manufacturer.Have capable field sync signal on it, or provide capable field sync signal by other holding wire.These vision signals were aimed at fiducial time.Image connection circuit 75 is opposite processing procedures with image Segmentation circuit 2.
At last, the video code flow that splicing is good is undertaken being sent to high definition TV display device 81 after the processing such as A/D conversion and filtering and shows by A/D conversion and post processing circuitry 76.
The high definition TV audio signal that is inserted in one tunnel the sub-program after cutting apart is also delivered to high definition TV display device 81 after audio decoder 74 decodings.
Be that example is introduced the image Segmentation method all below with 1440*1152 horizontally interlaced image form.
1) frame image split plot design (Fig. 4)
The frame image split plot design is to be that unit is divided into the image subsection that several suitable ordinary numbers television encoders are handled with the frame image with high definition television images.
With the 1440*1152 horizontally interlaced image is example, and the method that its frame image is divided by cross is divided into four interleaved subframe images of 720*576 form, and as shown in Figure 4, this four ways image can be given four encoding devices and carry out compressed encoding.Adopt frame field accommodation mode in the compression.
In actual applications, although ordinary numbers encoding device input imagery is the 720*576 form, but the efficient image picture of actual treatment 704*576 in compression is handled (about each cuts out the vertical bar that has removed 8 pixels, so that the effective number of picture elements of level is 32 multiple), therefore, when dividing high definition television images, each sanction about the 1440*1152 image is removed the wide vertical bar of 8 pixels, and then press the 720*576 form and divide, this moment the right of left image subsection and right subgraph elephant the left side overlapping the vertical bar of 16 pixels, entering encoding device after image has not just had lap after reducing like this.
For solving the problem of crossing the border of moving, can watch the viewpoint of image mainly to concentrate on the characteristics of center according to the people, the controlled encoder parameter makes the allocation bit number at cut-off rule place more, the bit number that former visual four jiaos of places distribute is few, thereby guaranteeing that data transfer rate is no more than under the situation of restriction, eliminating high definition TV and restore the blooming of crossing the border and cause because of motion in visual center.
2) field pattern resembles split plot design (Fig. 5)
It is that high definition television images is resembled with field pattern is that unit is divided into the image subsection that several suitable ordinary numbers television encoders are handled that field pattern resembles split plot design.
Horizontally interlaced image for the 1440*1152 form, with strange field pattern resemble be divided into that the 720*576 form lines by line scan about two image subsections, the idol field pattern resemble be divided into that the 720*576 form lines by line scan about two image subsections, as shown in Figure 5, the image subsection after cutting apart like this sends the ordinary numbers television encoder to and carries out compressed encoding.Adopt the frame mode to compress processing during compression.
Certainly, in actual applications, the problem that also has image to reduce, its processing method is the same with the frame image split plot design.For center cut-off rule place, the bit number that the may command coder parameters is distributed this place is more, thereby solves because of the cross the border blooming of the center of causing of motion.
3) subsampling split plot design (Fig. 6)
This method adopts a certain proportion of subsampling method initial point from former high definition television images to begin to extract out the treatable image subsection of some pixels composition ordinary numbers television encoders, change sampling start-phase (being about to the level or the vertical starting point displacement of subsampling) then, carry out the extraction of image subsection again, repeat this operation, become several sampling rates identical former image Segmentation at last, but the different image subsection of phase place.
For the high definition TV frame phenomenon of 1440*1152 horizontally interlaced image form, may be partitioned into the image subsection of four 720*576 forms.Each image subsection is 1: 2 subsampling image of former high-definition image, and its pixel of taking a sample is respectively seen shown in Figure 6.Image subsection after cutting apart adopts the frame mode when doing the compression processing.
About the cutting edge problem in the practical application, can not consider, because the edge of the image subsection of subsampling is the edge of former image, the problem that former image center place is reduced can not appear.
Frame cross division methods with 1440*1152 interlacing scan format pattern is that example illustrates visual joining method below.At first, the sub-image data stream of cutting apart is input in the buffer, low speed writes, read at a high speed, make its data flow of reading reach the data bit rate of high definition television images, adopt the left side image to read delegation simultaneously, the right-hand part image is read the method for delegation then, so just the image subsection splicing can be restored the high definition television images data flow.In addition, system controller is also controlled and is inserted the row field sync signal, or provides row field signal by other holding wire.
All be similar to this for other image partitioning method, the contrary processing that is the image Segmentation processing gets final product.Correspondingly revise simultaneously row field signal.
Claims (4)
1. one kind is utilized the system that has digital video broadcasting (DVB) device transmission high definition TV now, its transmitting terminal comprises a plurality of ordinary numbers television encoders (3), multiplexer (4), chnnel coding and modulation circuit (5), emission system (6) etc., its receiving terminal comprises Integrated Receive Decoder (7), it comprises demodulator circuit (71), demodulation multiplexer (72), ordinary numbers television video decoder (73) and audio decoder (74) etc., it is characterized in that:
Its transmitting terminal also comprises: A/D converter (1), and image Segmentation device (2) and controller (9) etc.,
High definition television video signal becomes digital signal after handling through A/D converter (1) earlier, its output interface is connected with image Segmentation device (2), image Segmentation processor (2) carries out dividing processing to the high definition TV digital video signal, form the experimental process video data stream, these sub video data streams are fed to a plurality of ordinary numbers television encoders (3) and carry out the compressed encoding processing.The operating parameter of each encoder (quantization matrix for example, data transfer rate etc.) dispose and control by system controller (9), make each encoder have same timer reference of programs (PCR), and make each image subsection that belongs to same frame originally have same show time scale (PTS) and decoding markers (DTS)
Each sub-video code stream of coding is sent to multiplexer (4) as program video compressed bit stream independently and carries out multiplexingly, and the parameter setting of system controller (9) control multiplexer (4) is to satisfy the requirement of image Segmentation and splicing;
The Integrated Receive Decoder of its receiving terminal also comprises image connection circuit (75), D/A conversion and post processing circuitry (76), image connection circuit (75) receives through demodulator circuit (71), demultiplexing circuit (72) and a plurality of ordinary numbers television video decoders (73) and handles video decompression code stream that the back obtains and carry out the splicing of image according to carve information wherein, splicing video code flow well undertaken by A/D conversion and post processing circuitry (76) that A/D changes and processing such as filtering after be sent to high definition TV display device (81) and show.
2. have the system of digital video broadcast device transmission of high distinctness TV according to the utilization of claim 1 now, it is characterized in that said image Segmentation device (2) is that unit is divided into the image subsection that four suitable ordinary numbers television encoders of every frame are handled with the frame image with high definition television images.
3. have the system of digital video broadcast device transmission of high distinctness TV according to the utilization of claim 1 now, it is characterized in that said image Segmentation device (2) resembles high definition television images with field pattern be that unit is divided into the image subsection that two every suitable ordinary numbers television encoders are handled.
4. have the system of digital video broadcast device transmission of high distinctness TV now according to the utilization of claim 1, it is characterized in that said image Segmentation device (2) initial point from former high definition television images begins to extract out some pixels and forms the treatable image subsection of ordinary numbers television encoder, change the sampling start-phase then, be about to the level or the vertical starting point displacement of subsampling, carry out the extraction of image subsection again, repeat this operation, become several sampling rates identical former image Segmentation at last, but the different image subsection of phase place.
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| CN97100540A CN1051193C (en) | 1997-01-30 | 1997-01-30 | System for transmission of high distinctness TV by use of existing digital broadcast equipment |
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| CN1067827C (en) * | 1998-07-08 | 2001-06-27 | 国家科学技术委员会高技术研究发展中心 | Apparatus for data transmission between sub-images in HDTV video coder and its method |
| CN1065391C (en) * | 1998-07-08 | 2001-05-02 | 国家科学技术委员会高技术研究发展中心 | Subimage synthesis device and method for video decoder of high-resolution TV set |
| CN1070010C (en) * | 1998-07-15 | 2001-08-22 | 国家科学技术委员会高技术研究发展中心 | HDTV video-frequency decoder using SDTV to decode ASIC and its decoding method |
| CN1058361C (en) * | 1998-08-28 | 2000-11-08 | 国家科学技术委员会高技术研究发展中心 | Method of using high clarity television codes flow for transmitting multiroute standard clarity television program |
| US7825915B2 (en) * | 2004-02-03 | 2010-11-02 | Intel Corporation | Codec control |
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| CN101697570B (en) | 2004-05-13 | 2012-07-18 | 三星电子株式会社 | Digital broadcasting transmission/reception devices and signal processing method thereof |
| US20090251616A1 (en) * | 2005-04-28 | 2009-10-08 | Samsung Electronics Co., Ltd. | Apparatus and method for processing data in digital broadcasting receiver |
| KR101074113B1 (en) * | 2007-05-31 | 2011-10-17 | 한국전자통신연구원 | Transmission Method, Transmission Apparatus, Reception Method, Reception Apparatus of Digital Broadcasting Signal and Transmission Frame―Form thereof |
| FR2965444B1 (en) | 2010-09-24 | 2012-10-05 | St Microelectronics Grenoble 2 | 3D VIDEO TRANSMISSION ON A HISTORIC TRANSPORT INFRASTRUCTURE |
| CN102196243B (en) * | 2011-04-02 | 2013-10-02 | 浙江宇视科技有限公司 | Video data processing method, device and system |
| CN102568389B (en) * | 2011-09-29 | 2014-08-13 | 厦门厦华投资有限公司 | System capable of automatically regulating backlight of television along with time |
| CN105592290A (en) * | 2014-10-20 | 2016-05-18 | 广东中星电子有限公司 | High-resolution video source compression method and high-resolution compressed video display method |
| CN105407311A (en) * | 2015-11-03 | 2016-03-16 | 青岛海信电器股份有限公司 | Television receiving signal processing method and device |
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