CN103220552A - Enhanced digital broadcasting transmitter - Google Patents
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Abstract
The invention relates to an enhanced digital broadcasting transmitter. The enhanced digital broadcasting transmitter comprises a first multiplexing device and a second multiplexing device, wherein the first multiplexing device is used for multiplexing basic digital audio data and basic digital video data, the sampling rate of the basic digital audio data is lower than that of acquired audio data, and the sampling rate of the basic digital video data is lower than that of the acquired video data; and second multiplexing device is connected with the first multiplexing device to receive multiplexed data and is used for multiplexing the multiplexed data, the acquired audio data and acquired video data, and sending all the multiplexed data through a DVB (Digital Video Broadcasting) channel. By virtue of the enhanced digital broadcasting transmitter, a normal data stream and a basic data stream which meets the basic requirements of a user can be simultaneously multiplexed and sent out, and then a receiving end can conveniently and adaptively select different data streams to receive according to the local channel environment, so that sounds and images which are continuous all the time can be showed for the receiving user.
Description
Technical field
The present invention relates to a kind of digital television broadcasting field, relate in particular to a kind of digitally enhanced broadcast transmitter.
Background technology
Digital video broadcasting (DVB, Digital Video Broadcasting) is by " a series of of DVB Project maintenance are the international Digital Television Open Standard of being admitted." DVB Project " is an industrial organization by more than 300 member compositions, it is by european telecommunications standards institute (European Telecommunications Standards Institute, ETSI), European electronic standard tissue (European Committee for Electrotechnical Standardization, CENELEC) and (the European Broadcasting Union of European Broadcasting Union, EBU) (Joint Technical Committee JTC) initiates " the joint specialist group " that constitutes jointly.
DVB system transmissions mode has following several: satellite television (DVB-S and DVB-S2), cable TV (DVB-C), terrestrial television (DVB-T), hand-held terrestrial wireless (DVB-H).These standard definitions the physical layer and the data link layer of transmission system.Equipment is by synchronous parallel interface (synchronous parallel interface, SPI), and synchronous serial interface (synchronous serial interface, SSI), or Asynchronous Serial Interface (asynchronous serial interface, ASI) mutual with physical layer.Data are transmitted in the mode of mpeg 2 transport stream, and require to meet stricter restriction (DVB-MPEG).The standard (DVB-H) of the instant compressed transmission data of portable terminal is among the test at present.The main distinction of these transmission meanss is the modulation system used, because the requirement difference of the different frequency bandwidths that their are used.Utilize the DVB-S of high frequency carrier to use the QPSK modulation system, utilize the DVB-C of low frequency carrier signal to use the QAM-64 modulation system, and utilize the DVB-T of VHF and UHF carrier wave to use the COFDM modulation system.
Aspect the content of transmission, except that the audio ﹠ video transmission, DVB has also defined the data communication standard (DVB-DATA) of taking back deliver a letter (DVB-RC).It supports several media, comprises DECT, GSM, PSTN, ISDN etc.Also support some agreements, comprise DVB-IPI:Internet Protocol, DVB-NPI:network protocol independent.
The DVB standard application is extensive, and DVB-S and DVB-C were issue in 1994, and DVB-T was issue in 1997.First commercial DVB-T broadcast system is to be set up in 1998 by the Digital Terrestrial Group (DTG) of Britain, in 2003, Berlin, Germany becomes first area of thoroughly breaking anolog TV signals, many European countries prepare to break PAL/SECAM in 2010, realize comprehensive Digital Televisionization.The situation in all parts of the world district is in its Europe, cradle, and in Australia, South Africa and India, DVB or popularizes.In Asia, Africa and the South American nations of majority, wired and satellite has adopted the DVB standard.Except that South American nations do not determine that as yet all the other countries have determined to adopt the DVB-T standard the terrestrial broadcasting standard (DTTV).
But, existing DVB transmission is a kind of Channel Transmission mode of perfect condition, for the user who receives, it is bad and cause the situation that picture is discontinuous even can't watch receive channel often to occur, if signal quality is crossed difference and continued for a good while, on the one hand, user's impression is very uncomfortable, on the other hand, and sometimes for causing key message to receive, in view of this, lack the radiation pattern that a kind of recipient of making can receive the signal that links up all the time in the existing transmission means.
Therefore, need a kind of data flow at two kinds of different resolutions of DVB channels transmit to be fit to the digitally enhanced broadcast transmitter of receiving terminal according to channel quality condition adaptively changing receiving data stream, by sending the form that double fluid is normal flow and elementary stream, be convenient to the recipient and formulate different reception strategies, when channel quality is good, it is constant to keep original DVB receive mode, receive normal data, when even quality that have influence on received signal general when channel quality reaches to a certain degree, abandoning the demultiplexing of normal data handles, the master data of handling through further error code and can guarantee data continuity is carried out demultiplexing handle, obtain the audio-video signal that links up.
Summary of the invention
In order to address the above problem, the invention provides a kind of data flow at two kinds of different resolutions of DVB channels transmit to be fit to the digitally enhanced broadcast transmitter of receiving terminal according to channel quality condition adaptively changing receiving data stream, provide two kinds of different resolutions but data flow that signal all links up at transmit leg, make the recipient needn't be entangled with of the influence of the receive channel of different quality under varying environment to signal, can change suitable reception strategy automatically, guarantee the coherent reception of various data in the Digital Television.
According to an aspect of the present invention, a kind of digitally enhanced broadcast transmitter is provided, comprise first multiplexer, multiplexing basic digital audio-frequency data and basic digital of digital video data, the sample rate of described basic digital audio-frequency data is lower than the sample rate of the voice data that collects, and the sample rate of described basic digital of digital video data is lower than the sample rate of the video data that collects; Second multiplexer connects first multiplexer receiving multiplex data, and multiplex data, the voice data that collects and the video data that collects are carried out multiplexing, and with it data after multiplexing send by the DVB channel.
More specifically, described digitally enhanced broadcast transmitter further comprises: the audio data collecting unit, the original audio data that collects is gathered and exported to the data that audio data sources is broadcast; The original video data that collects is gathered and exported in the video data acquiring unit to the data that video data source is broadcast; The voice data processing unit, connect the audio data collecting unit, receive the original audio data of audio data collecting unit output, original audio data is carried out analog-to-digital conversion, audio coding, and the digital audio-frequency data behind the encode audio is handled, acquisition is lower than half basic digital audio-frequency data of former sample rate, and digital audio-frequency data and basic digital audio-frequency data are exported simultaneously; The video data processing unit, connect the video data acquiring unit, the original video data of receiving video data collecting unit output, original video data is carried out video coding, and the digital of digital video data behind the video coding handled, acquisition is lower than half basic digital of digital video data of former resolution, and digital of digital video data and basic digital of digital video data are exported simultaneously; First multiplexer, connect voice data processing unit and video data processing unit, the basic digital audio-frequency data that receives and basic digital of digital video data are carried out multiplexing, obtain first master data transport stream TS stream, the MPEG-2 frame structure that the described first master data TS stream has 188 bytes; The first reed-solomon RS encoder connects first multiplexer, and the first master data TS stream of 188 bytes that receive is carried out RS(204,188) coding, export the first error protection bag of 204 bytes; The one TS flows packing device, connects a RS encoder, and the first error protection bag of 204 bytes that receive is proceeded the packing of TS stream, generates the second master data TS stream of 188 bytes; Second multiplexer, connect voice data processing unit, video data processing unit and TS stream packing device, the additional data beyond the digital audio-frequency data, digital of digital video data and second master data TS stream and the audio, video data that receive is multiplexed with enhanced data TS stream; Sync byte counter-rotating and data randomisation means connect second multiplexer, the sync byte SYNC1 byte in the enhanced data TS stream that receives is reversed, and the data after the counter-rotating are gone randomization, and the data after the randomization are gone in output; The 2nd RS encoder connects sync byte counter-rotating and data randomisation means, and the data after the randomization of going that receive are carried out RS(204,188) coding, export the second error protection bag of 204 bytes; Convolutional deinterleaver connects the 2nd RS encoder, and it is 12 convolutional interleave that the second error protection bag that receives is carried out the degree of depth, the output byte behind the output convolutional interleave; The emission pretreatment unit connects convolutional deinterleaver, and the output byte behind the convolutional interleave that receives is carried out mapping, differential decoding, the base band moulding of byte to symbol, and the output two paths of signals is I road signal, Q road signal; Quadrature amplitude modulation QAM modulator connects the emission pretreatment unit, and I road signal, the Q road signal that receives carried out the QAM modulation, generates digital TV broadcast signal to send by cable TV DVB-C channel; Wherein, the concrete structure of the transport stream TS stream of described MPEG-2 frame structure is, TS stream is made up of packet header and load, described packet header comprises a sync byte SYNC1 and three other bytes, described three other bytes are used for traffic identification, scrambling and control information, described load comprises the MPEG-2 data of 184 bytes, specifically being distributed as of three other bytes in described TS stream packet header, 1 transmission error code indication bit position, 1 net amount is according to initial indication bit position, unit, and 1 is transmitted the priority bit position, 13 bag identifier PID bits, 2 are transmitted scrambling control bit position, control bit position, 2 self adaptation districts and 4 continuous counter bits; Wherein, in the multiplexing operation of second multiplexer, be included as digital audio-frequency data, digital of digital video data and the second master data TS flow data and distribute different bag identifier PID, and in the multiplexing operation of first multiplexer, be included as basic digital audio-frequency data and distribute different bag identifier PID, be used in of the identification respectively and the reception of digital TV broadcast signal receiving terminal to digital audio-frequency data, digital of digital video data, basic digital audio-frequency data and basic digital of digital video data with basic digital of digital video data.
More specifically, described digitally enhanced broadcast transmitter further comprises: described QAM modulation is the modulation system two enterprising line amplitude modulation of quadrature carrier, and described two carrier waves are that phase difference is the sine wave of 90 degree (pi/2).
More specifically, described digitally enhanced broadcast transmitter further comprises: described audio data collecting unit comprises microphone and noise removing microphone, and described noise removing microphone is corresponding to microphone to gather ambient noise and to eliminate ambient noise in the original audio data that microphone collects.
More specifically, described digitally enhanced broadcast transmitter further comprises: described video data acquiring unit comprises video camera, and the resolution of the original video data that it collects comprises 720 * 480,1920 * 1080,1280 * 720 or 1920 * 1080.
Description of drawings
Below with reference to accompanying drawing embodiment of the present invention are described, wherein:
The block diagram of the digitally enhanced broadcast transmitter that Fig. 1 illustrates according to an embodiment of the present invention.
Wherein, 1, audio data collecting unit; 2, video data acquiring unit; 3, voice data processing unit; 4, video data processing unit; 5, first multiplexer; 6, a RS encoder; 7, TS stream packing device; 8, second multiplexer; 9, sync byte counter-rotating and data randomisation means; 10, the 2nd RS encoder; 11, convolutional deinterleaver; 12, emission pretreatment unit; 13, QAM modulator.
Embodiment
Embodiment to digitally enhanced broadcast transmitter of the present invention is elaborated below with reference to accompanying drawings.
Fig. 1 illustrates the block diagram of the digitally enhanced broadcast transmitter that illustrates according to an embodiment of the present invention.Wherein the data flow at two kinds of different resolutions of DVB channels transmit comprises with the digitally enhanced broadcast transmitter of suitable receiving terminal according to channel quality condition adaptively changing receiving data stream: first multiplexer 5, multiplexing basic digital audio-frequency data and basic digital of digital video data, the sample rate of described basic digital audio-frequency data is lower than the sample rate of the voice data that collects, and the sample rate of described basic digital of digital video data is lower than the sample rate of the video data that collects; Second multiplexer 8 connects first multiplexer receiving multiplex data, and multiplex data, the voice data that collects and the video data that collects are carried out multiplexing, and with it data after multiplexing send by the DVB channel.Wherein, comprise more specifically that the original audio data that collects is gathered and exported in audio data collecting unit 1 to the data that audio data sources is broadcast; The original video data that collects is gathered and exported in video data acquiring unit 2 to the data that video data source is broadcast; Voice data processing unit 3, connect audio data collecting unit 1, receive the original audio data of audio data collecting unit 1 output, original audio data is carried out analog-to-digital conversion, audio coding, and the digital audio-frequency data behind the encode audio is handled, acquisition is lower than half basic digital audio-frequency data of former sample rate, and digital audio-frequency data and basic digital audio-frequency data are exported simultaneously; Video data processing unit 4, connect video data acquiring unit 2, the original video data of receiving video data collecting unit 2 outputs, original video data is carried out video coding, and the digital of digital video data behind the video coding handled, acquisition is lower than half basic digital of digital video data of former resolution, and digital of digital video data and basic digital of digital video data are exported simultaneously; First multiplexer 5, connect voice data processing unit 3 and video data processing unit 4, carry out the basic digital audio-frequency data and the basic digital of digital video data that receive multiplexing, obtain first master data transport stream TS stream, the MPEG-2 frame structure that the described first master data TS stream has 188 bytes; The first reed-solomon RS encoder 6 connects first multiplexer 5, and the first master data TS stream of 188 bytes that receive is carried out RS(204,188) coding, export the first error protection bag of 204 bytes; The one TS flows packing device 7, connects a RS encoder 6, and the first error protection bag of 204 bytes that receive is proceeded the packing of TS stream, generates the second master data TS stream of 188 bytes; Second multiplexer 8, connect voice data processing unit 3, video data processing unit 4 and TS stream packing device 7, the additional data beyond the digital audio-frequency data, digital of digital video data and second master data TS stream and the audio, video data that receive is multiplexed with enhanced data TS stream; Sync byte counter-rotating and data randomisation means 9 connect second multiplexer 8, the sync byte SYNC1 byte in the enhanced data TS stream that receives is reversed, and the data after the counter-rotating are gone randomization, and the data after the randomization are gone in output; The 2nd RS encoder 10 connects sync byte counter-rotating and data randomisation means 9, and the data after the randomization of going that receive are carried out RS(204,188) coding, export the second error protection bag of 204 bytes; Convolutional deinterleaver 11 connects the 2nd RS encoder 10, and it is 12 convolutional interleave that the second error protection bag that receives is carried out the degree of depth, the output byte behind the output convolutional interleave; Emission pretreatment unit 12 connects convolutional deinterleaver 11, and the output byte behind the convolutional interleave that receives is carried out mapping, differential decoding, the base band moulding of byte to symbol, and the output two paths of signals is I road signal, Q road signal; Quadrature amplitude modulation QAM modulator 13 connects emission pretreatment unit 12, and I road signal, the Q road signal that receives carried out the QAM modulation, generates digital TV broadcast signal to send by cable TV DVB-C channel; Wherein, the concrete structure of the transport stream TS stream of described MPEG-2 frame structure is, TS stream is made up of packet header and load, described packet header comprises a sync byte SYNC1 and three other bytes, described three other bytes are used for traffic identification, scrambling and control information, described load comprises the MPEG-2 data of 184 bytes, specifically being distributed as of three other bytes in described TS stream packet header, 1 transmission error code indication bit position, 1 net amount is according to initial indication bit position, unit, and 1 is transmitted the priority bit position, 13 bag identifier PID bits, 2 are transmitted scrambling control bit position, control bit position, 2 self adaptation districts and 4 continuous counter bits; Wherein, in the multiplexing operation of second multiplexer 8, be included as digital audio-frequency data, digital of digital video data and the second master data TS flow data and distribute different bag identifier PID, and in the multiplexing operation of first multiplexer 5, be included as basic digital audio-frequency data and distribute different bag identifier PID, be used in of the identification respectively and the reception of digital TV broadcast signal receiving terminal to digital audio-frequency data, digital of digital video data, basic digital audio-frequency data and basic digital of digital video data with basic digital of digital video data.
Wherein, Reed Solomon code (lining institute sign indicating number, Reed-solomon codes is called for short RS codes) is a kind of chnnel coding of forward error corrigendum, and is effective to the multinomial that is produced by correction over-sampling data.Cataloged procedure at first asks redundant to these multinomials on a plurality of points, then with its transmission or storage.Must sample and make multinomial overdetermination (cross limit) the polynomial this essential value that exceeds.When receiver correct receive enough points after, it just can recover original multinomial, even have a lot by the noise jamming distortion on the multinomial that receives.Reed Solomon code is widely used in various commercial uses, and the most significant is use on CD, DVD and Blu-ray Disc; In transfer of data, it also is used to DSL and WiMAX; DVB and ATSC its figure that also flashing in the broadcast system; In computer science, it is the important member of layer 6 standard RAID.Reed Solomon code is fixed length code, this means that the data of a regular length input will be processed into the dateout of a regular length.For example, in (255,223) RS coding, 223 Read-Solomon incoming symbols (each symbol has 8 bits) are encoded into 255 output symbols.Most of Read-Solomon error corrections coding flow processs are architectonicals, this means that some is comprising the primitive form of importing data in the code word of output.Symbol size by in 8 bits sign indicating number to force code length (code length) the longest be 255 symbols.
In addition, described digitally enhanced broadcast transmitter further comprises: described QAM modulation is the modulation system two enterprising line amplitude modulation of quadrature carrier, and described two carrier waves are that phase difference is the sine wave of 90 degree (pi/2).
Wherein, QAM(Quadrature Amplitude Modulation) digital modulator is as the headend equipment of DVB system, reception is from the TS stream of equipment such as encoder, multiplexer, DVB gateway, video server, carry out RS coding, convolutional encoding and QAM digital modulation, the radiofrequency signal of output can directly transmit on cable television network, also can select intermediate frequency output simultaneously as required.He disposes and superior performance index flexibly with it, is widely used in digital cable TV transmission field and digital MMDS system.QAM carries out carrier-suppressed double sideband amplitude modulation with the two independent baseband signal to two mutually orthogonal same frequency carrier waves, utilizes the orthogonality of frequency spectrum in same bandwidth of this modulated signal, realizes the transmission of the digital information that two-way is parallel.This modulation system has binary system QAM(4QAM usually), quaternary QAM(l6QAM), octal system QAM(64QAM) etc., corresponding spacing wave vector end points distribution map is called planisphere, have 4,16,64 respectively ... individual vector end points.Relation between level number m and the signal condition M is for 4QAM, and when the two paths of signals amplitude equated, its generation, demodulation, performance and phase vectors were all identical with 4PSK.
Wherein, MPEG-2 is video and the audio compression international standard of MPEG working group in issue in 1994.MPEG-2 is commonly used to comprise satellite television, cable TV etc. for broadcast singal provides video and audio coding.MPEG-2 also becomes the core technology of DVD product through after the minor modifications.The system description of MPEG-2 part (part 1) has defined transport stream, and it is used for a mechanism that is enclosed within transmission digital video signal and audio signal on the non-reliable medium, mainly is used in field of broadcast televisions.The second portion of MPEG-2 is that video section and MPEG-1 are similar, but it provides the support (interlacing scan is widely used in field of broadcast televisions) to the interlaced scanning video display mode.The MPEG-2 video is not optimized low bit speed rate (less than 1Mbps), and under 3Mbit/s and above bit rate situation, MPEG-2 obviously is better than MPEG-1.The MPEG-2 back compatible that is to say, all standard compliant MPEG-2 decoders also can normal play MPEG-1 video flowing.The MPEG-2 technology also has been applied in HDTV transmission system and the Blu-ray Disc.
In addition, described digitally enhanced broadcast transmitter further comprises: described audio data collecting unit 1 comprises microphone and noise removing microphone, and described noise removing microphone is corresponding to microphone to gather ambient noise and to eliminate ambient noise in the original audio data that microphone collects.By identical ambient noise in the collection of noise removing microphone and the original audio data that microphone collects, in original audio data, deduct described ambient noise, obtain real original audio data.
In addition, described digitally enhanced broadcast transmitter further comprises: described video data acquiring unit 2 comprises video camera, and the resolution of the original video data that it collects comprises 720 * 480,1920 * 1080,1280 * 720 or 1920 * 1080.The video resolution of gathering has determined the video data volume size.
Wherein, how many videos of often mentioning takes advantage of what, is not resolution strictly speaking, but the height of video/wide pixel value.Resolution is to be used for what a parameter of data volume in the dimensioned plan picture, be often expressed as ppi(per inch pixel Pixel per inch), refer to the valid pixel of a frame picture on horizontal and vertical, the ppi value is higher, seem clear, when window amplifies, owing to there is not so much valid pixel to fill window, valid pixel ppi value descends, and is just fuzzy.Customary resolution is meant the height/wide pixel value of image, and proper resolution is meant the valid pixel value ppi in the unit length.The height of image/wide pixel value and size are irrelevant, but the valid pixel value ppi in the unit length is just relevant with size, and obviously the big more ppi of size is more little.
Adopt digitally enhanced broadcast transmitter of the present invention, improved original inflexible DVB transmission mode greatly, in carrying out the digital television signal transmission and receiving, transmitter terminal has transmitted the data of the different identical content of two kinds of resolution, so that receiving terminal has taken into full account the quality of transmission channel, the self adaptation adjustment receives strategy, is increasing under the few situation of volume of transmitted data, has guaranteed that the user watches that the video and audio signal with uppick is that complete sum is continuous.
Be understandable that though the present invention with the preferred embodiment disclosure as above, yet the foregoing description is not in order to limit the present invention.For any those of ordinary skill in the art, do not breaking away under the technical solution of the present invention scope situation, all can utilize the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention, all still belongs in the scope of technical solution of the present invention protection any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (5)
1. a digitally enhanced broadcast transmitter is characterized in that, described transmitter comprises:
First multiplexer, multiplexing basic digital audio-frequency data and basic digital of digital video data, the sample rate of described basic digital audio-frequency data is lower than the sample rate of the voice data that collects, and the sample rate of described basic digital of digital video data is lower than the sample rate of the video data that collects;
Second multiplexer connects first multiplexer receiving multiplex data, and multiplex data, the voice data that collects and the video data that collects is carried out multiplexing, and the data after multiplexing is sent by digital television broadcasting DVB channel.
2. digitally enhanced broadcast transmitter as claimed in claim 1 is characterized in that, also comprises:
The original audio data that collects is gathered and exported in the audio data collecting unit to the data that audio data sources is broadcast;
The original video data that collects is gathered and exported in the video data acquiring unit to the data that video data source is broadcast;
The voice data processing unit, connect the audio data collecting unit, receive the original audio data of audio data collecting unit output, original audio data is carried out analog-to-digital conversion, audio coding, and the digital audio-frequency data behind the encode audio is handled, acquisition is lower than half basic digital audio-frequency data of former sample rate, and digital audio-frequency data and basic digital audio-frequency data are exported simultaneously;
The video data processing unit, connect the video data acquiring unit, the original video data of receiving video data collecting unit output, original video data is carried out video coding, and the digital of digital video data behind the video coding handled, acquisition is lower than half basic digital of digital video data of former resolution, and digital of digital video data and basic digital of digital video data are exported simultaneously;
Described first multiplexer connects voice data processing unit and video data processing unit, carry out the basic digital audio-frequency data and the basic digital of digital video data that receive multiplexing, obtain first master data transport stream TS stream, the MPEG-2 frame structure that the described first master data TS stream has 188 bytes;
The first reed-solomon RS encoder connects first multiplexer, and the first master data TS stream of 188 bytes that receive is carried out RS(204,188) coding, export the first error protection bag of 204 bytes;
The one TS flows packing device, connects a RS encoder, and the first error protection bag of 204 bytes that receive is proceeded the packing of TS stream, generates the second master data TS stream of 188 bytes;
Described second multiplexer connects voice data processing unit, video data processing unit and TS stream packing device, and the additional data beyond the digital audio-frequency data, digital of digital video data and second master data TS stream and the audio, video data that receive is multiplexed with enhanced data TS stream;
Sync byte counter-rotating and data randomisation means connect second multiplexer, the sync byte SYNC1 byte in the enhanced data TS stream that receives is reversed, and the data after the counter-rotating are gone randomization, and the data after the randomization are gone in output;
The 2nd RS encoder connects sync byte counter-rotating and data randomisation means, and the data after the randomization of going that receive are carried out RS(204,188) coding, export the second error protection bag of 204 bytes;
Convolutional deinterleaver connects the 2nd RS encoder, and it is 12 convolutional interleave that the second error protection bag that receives is carried out the degree of depth, the output byte behind the output convolutional interleave;
The emission pretreatment unit connects convolutional deinterleaver, and the output byte behind the convolutional interleave that receives is carried out mapping, differential decoding, the base band moulding of byte to symbol, and the output two paths of signals is I road signal, Q road signal;
Quadrature amplitude modulation QAM modulator connects the emission pretreatment unit, and I road signal, the Q road signal that receives carried out the QAM modulation, generates digital TV broadcast signal to send by cable digital TV broadcasting DVB-C channel;
Wherein, the concrete structure of the transport stream TS stream of described MPEG-2 frame structure is, TS stream is made up of packet header and load, described packet header comprises a sync byte SYNC1 and three other bytes, described three other bytes are used for traffic identification, scrambling and control information, described load comprises the MPEG-2 data of 184 bytes, specifically being distributed as of three other bytes in described TS stream packet header, 1 transmission error code indication bit position, 1 net amount is according to initial indication bit position, unit, and 1 is transmitted the priority bit position, 13 bag identifier PID bits, 2 are transmitted scrambling control bit position, control bit position, 2 self adaptation districts and 4 continuous counter bits;
Wherein, in the multiplexing operation of second multiplexer, be included as digital audio-frequency data, digital of digital video data and the second master data TS flow data and distribute different bag identifier PID, and in the multiplexing operation of first multiplexer, be included as basic digital audio-frequency data and distribute different bag identifier PID, be used in of the identification respectively and the reception of digital TV broadcast signal receiving terminal to digital audio-frequency data, digital of digital video data, basic digital audio-frequency data and basic digital of digital video data with basic digital of digital video data.
3. digitally enhanced broadcast transmitter as claimed in claim 2 is characterized in that:
Described QAM modulation is the modulation system two enterprising line amplitude modulation of quadrature carrier, and described two carrier waves are that phase difference is the sine wave of 90 degree (pi/2).
4. digitally enhanced broadcast transmitter as claimed in claim 2 is characterized in that:
Described audio data collecting unit comprises microphone and noise removing microphone, and described noise removing microphone is corresponding to microphone to gather ambient noise and to eliminate ambient noise in the original audio data that microphone collects.
5. digitally enhanced broadcast transmitter as claimed in claim 2 is characterized in that:
Described video data acquiring unit comprises video camera, and the resolution of the original video data that described video data acquiring unit collects comprises 720 * 480,1920 * 1080,1280 * 720 or 1920 * 1080.
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| US11663442B2 (en) | 2016-05-09 | 2023-05-30 | Strong Force Iot Portfolio 2016, Llc | Methods and systems for detection in an industrial Internet of Things data collection environment with intelligent data management for industrial processes including sensors |
| US11774944B2 (en) | 2016-05-09 | 2023-10-03 | Strong Force Iot Portfolio 2016, Llc | Methods and systems for the industrial internet of things |
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