CN1753463A - High tone quality digital broadcasting receiving-transmitting system - Google Patents
High tone quality digital broadcasting receiving-transmitting system Download PDFInfo
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- CN1753463A CN1753463A CNA2004100516562A CN200410051656A CN1753463A CN 1753463 A CN1753463 A CN 1753463A CN A2004100516562 A CNA2004100516562 A CN A2004100516562A CN 200410051656 A CN200410051656 A CN 200410051656A CN 1753463 A CN1753463 A CN 1753463A
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Abstract
This invention relates to a high tone quality digital broadcast sending-receiving system including an emitting end and a receiving end, in which, the emitting end includes: an AC-3 encoder encoding audio signal, a channel encoder turning the signal distortion and attenuation to the smallest, a DAB multiplier multiplying data flows and an emitting device emitting signals, the receiving end includes: a receiving device receiving signals emitted by the emitting end and demodulating them, a DAB receiving device inversely multiplying, decoding and playing signals, a channel decoder carrying out channel decode to data flows, an AC-3 decoder recovering the original multi-channel high tone quality audio data and a loud speaker.
Description
(1) technical field
The invention relates to high tone quality digital broadcasting receive-transmit system,, can receive and dispatch a kind of high tone quality digital broadcasting receive-transmit system of 5.1 channels especially about having used the DMB receive-transmit system.
(2) background technology
Above-mentioned DMB is the abbreviation of Digital Multimedia Broadcasting, and it is the new transmit-receive technology that occupies critical positions in digital transmitting and receiving standard of future generation.Above-mentioned DMB has used digital broadcasting technology DAB (Digital Audio Broadcasting), can receive the MPEG-4 video/audio simultaneously, and can be in moving process the techniques of receiving digital television.
Above-mentioned DAB is meant and can not only receives and dispatches compact disc (Compact Disk; The audio frequency of high tone quality such as CD), and the audio broadcasting that can receive and dispatch literal, diagram and animated image.Korea S has been a national standard with You Lika-147 standard code in Europe.
Above-mentioned DAB comprises following four aspect advantages: the first, can spend cheap price, and carry out diversified MMS (Multimedia Message Service); The second, according to frequency band division, can be used for the signal transmitting and receiving of mobile object; The 3rd, by the service of transmission additional data is provided, create the financial resources that make new advances; The 4th, be receiver market injection new vitality, and can receive greatest industry effect.
In the existing standard scheme, for DAB, the broadcast standard of inquiring into is the broadcasting of 128kbps stereo audio, maximum CD Quality standard.(MPEG-2 broadcasting)
Simultaneously, for the A/V audio frequency of DMB, also require the similarly audio frequency tonequality of standard.(BSAC broadcasting)
Fig. 1 a and Fig. 1 b show is A/V broadcast transmission, receiving system according to the DMB of prior art.As shown in Figure 1a, existing DMB emission system is made of following each several part: the MPEG-4 encoder 110 that audio signal and vision signal are encoded with the form of MPEG-4; Make the signal distorted signals that by channel the time, is generated and the channel encoder 120 of decaying and becoming minimum of output behind MPEG-4 encoder 110 codings; Data flow that above-mentioned channel encoder 120 is exported and the audio signal of exporting through MPEG-2 audio coder 140 coding backs are carried out the DAB Port Multiplier 130 of multipleization; Output signal to DAB Port Multiplier 130 is modulated, and the emitter of launching 140.
Simultaneously, shown in Fig. 1 b, existing DMB receiving system is made of following each several part: the signal that receiving and transmitting unit 150 emits, and this signal carried out demodulated received device 210; Above-mentioned signal through demodulation is carried out contrary multipleization, and, generate audio signal and data flow this signal decoding through contrary multipleization processing, and the DAB receiver of playing by 260 pairs of audio signals of loud speaker that the MP-2 audio decoder has been installed 220; The data flow that above-mentioned DAB receiver 220 is exported is carried out the channel decoder 230 of channel-decoding; The data flow that above-mentioned channel decoder 230 is exported is decoded, restore the MPEG-4 decoder 240 of original vision signal and audio signal; Playing device 250 that above-mentioned vision signal is play and the loud speaker 270 that above-mentioned audio signal is played back.
In September, 2003, Korea S has established the standard of the formal transmitting-receiving DMB ground ripple video and audio signal of bringing into use from 2004, and now, Korea S has entered the detailed operation phase.
Above-mentioned video standard is H.264 (MPEG-4 Part10), and video standard is the distortion BSAC of MPEG-4 AAC.
H.264, above-mentioned is the up-to-date MPEG-4 specification of 2003 annual establishment standards, compares with existing MPEG-4, and it is about 50% that its compression ratio exceeds, and can hold more television channel in the ripple DMB frequency on the ground.
Above-mentioned BSCA compares with MP-2 (MPEG Layer 2), though decline is arranged slightly, it is to compare with MPEG-4VBR to have the more CODEC of high tone quality.
240 pairs of above-mentioned MPEG-4 decoders utilize the audio signal of above-mentioned BSAC compression to decode, and play back by loud speaker 270, to utilizing the H.264 decoding video signal of compression, and play back by display screen 250 or drawing board etc.
But aforesaid DAB (Digital Audio Broadcasting) system is the equipment that has audio system and video system simultaneously, if this system is used for vehicle-mounted, the driver does not need above-mentioned whole system.Be that the driver only needs audio system, need video system hardly, simultaneously, for original DMB, because its utilization is the MPEG-4 standard scheme, so when listening to, stereo sound effect descends to some extent.
(3) summary of the invention
The objective of the invention is for addressing the above problem, a kind of DMB receive-transmit system of having used is provided, can receive and dispatch the multi channel high tone quality digital broadcasting of Doby receive-transmit system.
To achieve these goals, high tone quality digital broadcasting receive-transmit system of the present invention comprises transmitting terminal and receiving terminal two parts, wherein, transmitting terminal is made of following each several part: to coding audio signal, generate the AC-3 encoder of the voice data of multichannel high tone quality; Channel is encoded the channel encoder that distorted signals that the signal that above-mentioned AC-3 encoder is exported is generated and decay become minimum by channel the time; The DAB Port Multiplier of multipleization of data flow that above-mentioned channel encoder is exported and the output signal of DAB Port Multiplier modulated, and the emitter of launching.Receiving terminal is made of following each several part: receive the signal that transmitting terminal emits, and this signal is carried out the demodulated received device; The above-mentioned signal that receives is carried out contrary multipleization, and, generate audio signal and data flow this signal decoding through contrary multipleization processing, and the DAB receiver of audio signal being play by the loud speaker that the MP-2 audio decoder has been installed; The data flow that above-mentioned DAB receiver is exported is carried out the channel decoder of channel-decoding; The data flow that above-mentioned channel decoder is exported is decoded, restore the AC-3 decoder of original multichannel high tone quality voice data; The loud speaker that the high tone quality audio signal that above-mentioned AC-3 decoder is exported plays back.
Above-mentioned multichannel refers to the channel more than 5.1,5.1 channels for example, 6.1 channels, 7.1 channels, 8.1 channels etc.
Effect of the present invention:
As mentioned above, high tone quality digital broadcasting receive-transmit system of the present invention provides a kind of DMB receive-transmit system of having used, and can receive and dispatch the system of Doby multichannel high tone quality broadcasting, makes the stero set that the user also can the uppick high tone quality under the situation of driving etc. to move.
Simultaneously, what the A/V system of existing DBM used is the MPEG-4 standard scheme with (768kbps+128kbps) transfer rate, and DBM audio system of the present invention is used the AC-3 standard scheme with 384kbps transfer rate, therefore, when the present invention has the stereo transmission high tone quality music of 1.5M bandwidth in usefulness, can provide the audio broadcasting service of greater number.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
(4) description of drawings
Fig. 1 a shows is A/V broadcast transmission system according to the DMB of prior art.
Fig. 1 b shows is A/V broadcast receiver system according to the DMB of prior art.
What Fig. 2 a showed is foundation high tone quality digital broadcast transmitting of the present invention system.
What Fig. 2 b showed is according to high tone quality digital broadcast receiving system of the present invention.
What Fig. 3 showed is Doby 5.1 channel systems.
The symbol description of major part in the accompanying drawing:
310:AC-3 encoder 320: channel encoder
330:DAB Port Multiplier 340: emitter
410: receiving system 420:DAB receiver
430: channel decoder 440:AC-3 decoder
450:MP-2 audio tweeter 460:AC-3 audio tweeter
(5) embodiment
Below with reference to accompanying drawings, the embodiment to high tone quality digital broadcasting receive-transmit system of the present invention is elaborated.
What Fig. 2 a and Fig. 2 b showed is according to high tone quality digital broadcasting receive-transmit system of the present invention.
High tone quality digit broadcasting system of the present invention can be divided into transmitting terminal and receiving terminal from big aspect, and above-mentioned transmitting terminal comprises AC-3 encoder 310, channel encoder 320, DAB Port Multiplier 330 and emitter 340 shown in Fig. 2 a.
310 pairs of coding audio signals of being imported of above-mentioned AC-3 encoder, and generate multichannel high tone quality voice data.
Above-mentioned multichannel refers to the channel more than 5.1,5.1 channels for example, and 6.1 channels, 7.1 channels, 8.1 channels etc. are that the center describes according to embodiments of the invention with 5.1 channels.
Above-mentioned Doby (high tone quality) 5.1 channels are made of following each several part as shown in Figure 3: the sub-woofer (Sub-woofer) 520 that low-frequency band is strengthened; Left side of face loud speaker (Front LeftSpeaker) 530; Loud speaker (Front Center Speaker) 540 in the middle of positive; Positive right speaker (Front Right Speaker) 550; Back left speaker (Rear Left Speaker) 560; Back right speaker (Rear Right Speaker) 570; Audio signal is carried out 5.1 channel sound equipments handle, make audio signal pass through the machine 510 of above-mentioned loud speaker output.As mentioned above, because the present invention possesses 5.1 channels, therefore can provide the more stero set sensation of high tone quality to the listener.
It is minimum that distorted signals that the signal that above-mentioned channel encoder (Channel Encoder) 320 is exported above-mentioned AC-3 encoder 310 is generated by channel time the and decay become.
DBM audio system of the present invention is used the AC-3 standard scheme with 384kbps transfer rate.Different with it is that what the A/V system of existing DBM used is the MPEG-4 standard scheme with (768kbps+128kbps) transfer rate.Therefore, when the present invention has the stereo transmission high tone quality music of 1.5M bandwidth in usefulness, can provide the audio broadcasting service of greater number.
Above-mentioned DAB Port Multiplier (Multiplexer; MUX) data flow exported of the 330 pairs of above-mentioned channel encoders 320 carry out multipleization.
The output signal of 340 pairs of DAB Port Multipliers 330 of above-mentioned emitter is modulated, and launches as transmitting terminal.
If the multiple mode of right angle coding frequency partition (Coded orthogonalFrequency Division Multiplexing is used in above-mentioned modulation; COFDM) more satisfactory.
Simultaneously, above-mentioned receiving terminal comprises as the lower part: receiving system 410 shown in Fig. 2 b; DAB receiver 420; Channel decoder 430; AC-3 decoder 440; MP-2 audio tweeter 450; 5.1 channel AC-3 audio tweeter 460.
Above-mentioned receiving system 410 comprises tuner, the signal that receiving and transmitting unit 340 emits, and this signal carried out demodulation.
420 pairs of above-mentioned signals that receive of above-mentioned DAB receiver carry out contrary multipleization, and with this signal decoding through contrary multipleization processing, generate audio signal and data flow, and play by 450 pairs of MP-2 audio stereo signals of loud speaker that the MP-2 audio decoder has been installed.
The data flow that 430 pairs of above-mentioned DAB receivers 420 of above-mentioned channel decoder are exported is carried out channel-decoding.The data flow that 440 pairs of above-mentioned channel decoders 430 of above-mentioned AC-3 decoder are exported is decoded, and restores original multichannel high tone quality voice data.
The high tone quality audio signal that the present invention is exported by the above-mentioned decoder 440 of above-mentioned 5.1 channel AC-3 audio tweeters, 460 outputs.
As mentioned above, the present invention does not use the MPEG-4 encoder/decoder that uses in the original DMB audio/video system, and the AC-3 encoder/decoder of use Doby multichannel high tone quality does not use stereo audio unit, and uses high tone quality multichannel Doby loud speaker.
Moreover, listen to when it can also be used to drive a car, but only have the function of listening to.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.
Claims (1)
1, a kind of high tone quality digital broadcasting receive-transmit system is made of transmitting terminal and receiving terminal, it is characterized in that comprising:
Described transmitting terminal is made of following each several part:
To coding audio signal, generate the AC-3 encoder of the voice data of multichannel high tone quality;
Channel is encoded the channel encoder that distorted signals that the signal that described AC-3 encoder is exported is generated and decay become minimum by channel the time;
The data flow that described channel encoder is exported is carried out the DAB Port Multiplier of multipleization;
Output signal to described DAB Port Multiplier is modulated, and the emitter of launching, and
Described receiving terminal is made of following each several part:
Receive the signal that the emitter of described transmitting terminal emits, and this signal is carried out the demodulated received device;
The described signal that receives is carried out contrary multipleization, and, generate audio signal and data flow this signal decoding through contrary multipleization processing, and the DAB receiver of audio signal being play by the loud speaker that the MP-2 audio decoder has been installed;
The data flow that described DAB receiver is exported is carried out the channel decoder of channel-decoding;
The data flow that described channel decoder is exported is decoded, restore the AC-3 decoder of original multichannel high tone quality voice data;
The loud speaker that the high tone quality audio signal that described AC-3 decoder is exported plays back.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004100516562A CN1753463A (en) | 2004-09-24 | 2004-09-24 | High tone quality digital broadcasting receiving-transmitting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004100516562A CN1753463A (en) | 2004-09-24 | 2004-09-24 | High tone quality digital broadcasting receiving-transmitting system |
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| Publication Number | Publication Date |
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| CN1753463A true CN1753463A (en) | 2006-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2004100516562A Pending CN1753463A (en) | 2004-09-24 | 2004-09-24 | High tone quality digital broadcasting receiving-transmitting system |
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|---|---|
| CN (1) | CN1753463A (en) |
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- 2004-09-24 CN CNA2004100516562A patent/CN1753463A/en active Pending
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