CN1160958C - Digital HDTV receiver - Google Patents
Digital HDTV receiver Download PDFInfo
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- CN1160958C CN1160958C CNB001126075A CN00112607A CN1160958C CN 1160958 C CN1160958 C CN 1160958C CN B001126075 A CNB001126075 A CN B001126075A CN 00112607 A CN00112607 A CN 00112607A CN 1160958 C CN1160958 C CN 1160958C
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- mpeg
- pass filter
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Abstract
The present invention discloses a digital HDTV receiver which respectively receives and processes basic flow signals and enhancement flow signals and subsequently carries out signal combination or code flow multiplying so as to form a single HDTV signal, and therefore, the present invention can receive HDTV transmission signals with SDTV signals. The receiver can be used in areas which adopt the HDTV transmission signals.
Description
The present invention relates to a kind of radiovisor, particularly a kind of digital HDTV receiver.
In the implementation procedure of HDTV television system, backward compatible SDTV is a thing highly significant.Such as, a kind of compatible scheme is arranged, the digital television signal of its transmission includes two kinds of signals of basic stream and enhanced flow.These two kinds of signals respectively occupy certain frequency bandwidth, and wherein, basic stream is corresponding to the resolution signal of single-definition digital television (SDTV), and basic stream adopts the COFDM modulation; Basic stream signal+enhanced flow signal is corresponding to the resolution signal of high definition digital television (HDTV), and enhanced flow adopts the 64QAM modulation.And basic stream and enhanced flow have two kinds of generation types: a kind of is the frequency division coded system, and promptly the HDTV picture signal is divided into two-way, and one the tunnel through after the low pass filter filtering, forms basic stream signal through the mpeg encoder compressed encoding; Another road forms the enhanced flow signal through another mpeg encoder compressed encoding after high pass filter filters.Another kind is a variable dimension code stream partitioning scheme, and promptly the picture signal of HDTV adopts the layer-stepping compression of MPEG-2 variable dimension
HP@HL(base+spt) carry out, the low layer data flow is as basic stream, and enhancement layer signal flows as enhanced flow.
But present HDTV receiver is to watch that this compatibility has the HDTV of SDTV signal to transmit signal.
The object of the present invention is to provide a kind of digital HDTV receiver, it can receive watches that described just now compatibility has the HDTV of SDTV signal to transmit signal.
In the forming process of basic stream and enhanced flow two kinds of methods are arranged because this HDTV transmits signal, therefore for achieving the above object, this receiving system has adopted two kinds of schemes.
Transmit signal for the HDTV that adopts the frequency division mode, this signal at first has tuner 1 to receive, be distributed into logical 2 and second band logical 3 of first band then and carry out bandpass filtering, wherein the filter bandwidht of first band logical 2 is identical with the frequency bandwidth that basic stream signal in the above-mentioned HDTV transmission signal takies; The filter bandwidht of second band logical 3 is identical with the frequency bandwidth that enhanced flow signal in the above-mentioned HDTV transmission signal takies; Give COFDM demodulation 4 by the signal of logical 2 outputs of first band and carry out channel demodulation, then through first error correction decoding 6, send into first mpeg decode 10, the signal data stream entering signal compound 12 of mpeg decode output; Simultaneously, signal by logical 3 outputs of second band is given 64 QAM demodulation 5, carry out channel demodulation, then through second error correction decoding 7, send into second mpeg decode 11, the signal data stream entering signal of mpeg decode output is compound 12, and signal compound 12 directly mixes addition with the output of first mpeg decode 10 with the output of second mpeg decode 11, send into TV coding 13 then, form the HDTV signal output of simulation.
Transmit signal for the HDTV that adopts variable dimension code stream partitioning scheme, this signal is at first received by tuner 1, be distributed into logical 2 and second band logical 3 of first band then and carry out bandpass filtering, wherein to transmit the frequency bandwidth that the basic stream signal in the signal takies identical for the filter bandwidht of first band logical 2 and above-mentioned HDTV, and the filter bandwidht of second band logical 3 is identical with the frequency bandwidth that enhanced flow signal in the above-mentioned HDTV transmission signal takies; Give COFDM demodulation 4 by the signal of logical 2 outputs of first band and carry out channel demodulation,, form stream substantially then through first error correction decoding 6; Give 64 QAM demodulation 5 by the signal of logical 3 outputs of second band simultaneously and carry out channel demodulation, form enhanced flow; Code stream multiple connection 14 will be flowed substantially with enhanced flow and be carried out multiple connection, so just form one road HDTV stream, enter mpeg decode 15 then, finish MPEG-2
HP@HL(base+spt) decoding, decoding output enters TV coding 13, forms the signal output of simulation HDTV.
This receiving system is because the frequency bandwidth of band pass filter, channel demodulation method, therefore stream and the synthetic processing method of enhanced flow can receive and watch that this compatibility has the HDTV transmission signal of SDTV with described transmission signal was corresponding just now substantially.
The present invention is further detailed explanation below in conjunction with embodiment and accompanying drawing.
Fig. 1 is the pie graph at an embodiment who adopts the frequency division coded system.
Fig. 2 is the pie graph at an embodiment who adopts variable dimension code stream partition encoding mode.
In Fig. 1, adopt the HDTV of frequency division coded system to transmit signal at first by tuner 1 reception, be distributed into logical 2 and second band logical 3 of first band then and carry out bandpass filtering, wherein to transmit the frequency bandwidth that the basic stream signal in the signal takies identical for the filter bandwidht of first band logical 2 and above-mentioned HDTV, and the filter bandwidht of second band logical 3 is identical with the frequency bandwidth that enhanced flow signal in the above-mentioned HDTV transmission signal takies; Give COFDM demodulation 4 by the signal of logical 2 outputs of first band and carry out channel demodulation, through first error correction decoding 6, pass through code stream demultiplexing 8 more then, the mpeg image code stream that solves is given first mpeg decode 10; The additional service data stream that solves is simultaneously given supplementary service and is handled 9, thereby realizes the supplementary service function.The signal data stream entering signal compound 12 of the signal data stream mpeg decode output of first mpeg decode, 10 outputs; Simultaneously, signal by logical 3 outputs of second band is given 64 QAM demodulation 5, carry out channel demodulation, then through second error correction decoding 7, send into second mpeg decode 11, the signal data stream entering signal of mpeg decode output is compound 12, and signal compound 12 directly mixes addition with the output of first mpeg decode 10 with the output of second mpeg decode 11, send into TV coding 13 then, form the HDTV signal output of simulation.
In Fig. 2, adopt the HDTV of variable dimension code stream partition encoding mode to transmit signal at first by tuner 1 reception, be distributed into logical 2 and second band logical 3 of first band then and carry out bandpass filtering, wherein to transmit the frequency bandwidth that the basic stream signal in the signal takies identical for the filter bandwidht of first band logical 2 and above-mentioned HDTV, and the filter bandwidht of second band logical 3 is identical with the frequency bandwidth that enhanced flow signal in the above-mentioned HDTV transmission signal takies; Give COFDM demodulation 4 by the signal of logical 2 outputs of first band and carry out channel demodulation,, form stream substantially then through first error correction decoding 6; Give 64 QAM demodulation 5 by the signal of logical 3 outputs of second band simultaneously and carry out channel demodulation, form enhanced flow; Code stream multiple connection 14 will be flowed substantially with enhanced flow and be carried out multiple connection, so just form one road HDTV stream, carry out code stream demultiplexing 8 then, and two class data flow are untied output, and the additional service data stream that solves is given supplementary service and handled 9, thereby realize the supplementary service function; The MPEG-2 image code stream that solves is simultaneously given MPEG-2 picture decoding 15, finishes MPEG-2
HP@HL(base+spt) decoding, the data flow of decoding output form the output of simulation HDTV signal again through TV coding 13.
Claims (4)
1. a digital HDTV receiver comprises tuner, band pass filter, channel demodulator, error correction decoder, mpeg decoder, TV encoder, it is characterized in that:
The Digital Television that this device reception is handled transmits the HDTV transmission signal that signal is a kind of compatible SDTV of transmission, source encoding in this transmission signal comprises a low pass filter, a high pass filter and two mpeg encoders, the HDTV picture signal is divided into two-way, and one tunnel process low pass filter filtering is after the mpeg encoder compressed encoding forms basic stream signal; Another road forms the enhanced flow signal through another mpeg encoder compressed encoding after high pass filter filters; Above-mentioned basic stream adopts the COFDM Channel Modulation, and enhanced flow adopts 64 QAM Channel Modulation;
Above-mentioned HDTV transmits signal and is at first received by tuner (1), be distributed into first band pass filter (2) then and second band pass filter (3) carries out bandpass filtering, wherein to transmit the frequency bandwidth that the basic stream signal in the signal takies identical for the filter bandwidht of first band pass filter (2) and above-mentioned HDTV, and the filter bandwidht of second band pass filter (3) is identical with the frequency bandwidth that enhanced flow signal in the above-mentioned HDTV transmission signal takies; Give COFDM demodulator (4) by the signal of first band pass filter (2) output and carry out channel demodulation, then through first error correction decoder (6) and code stream demodulation multiplexer (8), the picture intelligence that code stream demodulation multiplexer (8) obtains is sent into first mpeg decoder (10), the signal data stream entering signal recombiner (12) of mpeg decoder output; Simultaneously, signal by second band pass filter (3) output is given 64 qam demodulators (5), carry out channel demodulation, then through second error correction decoder (7), send into second mpeg decoder (11), the signal data stream entering signal recombiner (12) of mpeg decoder output, signal recombiner (12) directly mixes addition with the output of first mpeg decoder (10) with the output of second mpeg decoder (11), import TV encoder (13) then, form the HDTV signal output of simulation.
2. digital HDTV receiver according to claim 1 is characterized in that:
After the output of first error correction decoder (6), need through code stream demodulation multiplexer (8), the mpeg image code stream that solves is given first mpeg decoder (10), realizes the audio frequency and video function; The additional service data stream that solves is simultaneously given supplementary service processor (9), thereby realizes the supplementary service function.
3. a digital HDTV receiver comprises tuner, band pass filter, channel demodulator, error correction decoder, mpeg decoder, TV encoder, it is characterized in that:
The Digital Television that this device reception is handled transmits the HDTV transmission signal that signal is a kind of compatible SDTV of transmission, and the source encoding in this transmission signal adopts the layer-stepping compression of MPEG-2 variable dimension
HP@HL(base+spt) carry out, the low layer data flow is as basic stream, and enhanced layer data stream is as enhanced flow; Above-mentioned basic stream adopts the COFDM Channel Modulation, and enhanced flow adopts 64 QAM Channel Modulation;
Above-mentioned HDTV transmits signal and is at first received by tuner (1), be distributed into first band pass filter (2) then and second band pass filter (3) carries out bandpass filtering, wherein to transmit the frequency bandwidth that the basic stream signal in the signal takies identical for the bandwidth of first band pass filter (2) and above-mentioned HDTV, and the bandwidth of second band pass filter (3) is identical with the frequency bandwidth that enhanced flow signal in the above-mentioned HDTV transmission signal takies; Give COFDM demodulator (4) by the signal of first band pass filter (2) output and carry out channel demodulation,, form stream substantially then through first error correction decoder (6); Give 64 qam demodulators (5) by the signal of second band pass filter (3) output simultaneously and carry out channel demodulation, and form enhanced flow through second error correction decoder (7); Code stream multiplexer (14) will flow substantially with enhanced flow and carry out multiple connection, so just form one road HDTV stream, extract supplementary service information and mpeg image signal bit stream respectively through code stream demodulation multiplexer (8), wherein the mpeg image signal bit stream enters MPEG-2 decoder (15), finishes the layer-stepping compression of MPEG-2 variable dimension
HP@HL (base+spt)Decoding, decoding output enters TV encoder (13), forms the output of simulation HDTV signal.
4. digital HDTV receiver as claimed in claim 3 is characterized in that:
The HDTV stream that forms in code stream multiplexer (14) back needs through code stream demodulation multiplexer (8), and the mpeg image code stream that solves is given MPEG-2 decoder (15), realizes the audio frequency and video function; The additional service data stream that solves is simultaneously given supplementary service processor (9), thereby realizes the supplementary service function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001126075A CN1160958C (en) | 2000-01-08 | 2000-01-08 | Digital HDTV receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001126075A CN1160958C (en) | 2000-01-08 | 2000-01-08 | Digital HDTV receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1264249A CN1264249A (en) | 2000-08-23 |
| CN1160958C true CN1160958C (en) | 2004-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001126075A Expired - Fee Related CN1160958C (en) | 2000-01-08 | 2000-01-08 | Digital HDTV receiver |
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| Country | Link |
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| CN (1) | CN1160958C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100977646B1 (en) * | 2003-02-21 | 2010-08-24 | 닛본 덴끼 가부시끼가이샤 | Image data distribution system, device, and method |
| JP5579070B2 (en) * | 2007-11-01 | 2014-08-27 | アルカテル−ルーセント | Method and apparatus for transmitting / receiving audio / video content in a wireless access network |
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2000
- 2000-01-08 CN CNB001126075A patent/CN1160958C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1264249A (en) | 2000-08-23 |
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