CN103220570B - The terminal that receiving digital television signal carrying out is play - Google Patents
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Abstract
The present invention relates to a kind of receiving digital television signal and carry out the terminal play, comprising: signal strength detection module and digital television signal receiving system, respectively digital intensity of TV signal is detected, to digital radio TV signals receiving and process; The reception of the strong and weak control figure TV signal of digital television signal that digital television signal receiving system detects according to signal strength detection module and process.Pass through the present invention; can when channel circumstance worsens; the TS stream transmitted through the master data of error protection operation can be resolved; be met the audio, video data of basic broadcast request; the situation avoiding sound and the excessive user of impact of picture quality noise to watch occurs; simultaneously when channel circumstance very bad cannot Received signal strength, stop the reception invalid to digital television signal, save the electricity consumption of terminal equipment.
Description
Technical field
The present invention relates to a kind of digital TV field, particularly relate to a kind of receiving digital television signal and carry out the terminal play.
Background technology
Digital video broadcasting (DVB, DigitalVideoBroadcasting) is by " a series of Digital Television Open Standards being the world and admitting of DVBProject maintenance." DVBProject " is an industrial organization by more than 300 member compositions, it is by european telecommunications standards institute (EuropeanTelecommunicationsStandardsInstitute, ETSI), European electronic standardization tissue (EuropeanCommitteeforElectrotechnicalStandardization, and European Broadcasting Union (EuropeanBroadcastingUnion CENELEC), EBU) " joint specialist group " (JointTechnicalCommittee, the JTC) that constitute jointly initiates.
DVB system transfers mode has several as follows: satellite television (DVB-S and DVB-S2), cable TV (DVB-C), terrestrial television (DVB-T), hand-held terrestrial wireless (DVB-H).The physical layer of these standard definitions transmission system and data link layer.Equipment is by synchronous parallel interface (synchronousparallelinterface, SPI), synchronous serial interface (synchronousserialinterface, SSI), or Asynchronous Serial Interface (asynchronousserialinterface, ASI) is 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 mobile terminal is among test at present.The main distinction of these transmission meanss is the modulation system used, because the requirement of the frequency bandwidth of their application different is different.Utilize the DVB-S of high frequency carrier to use QPSK modulation system, utilize the DVB-C of low frequency carrier signal to use QAM-64 modulation system, and utilize the DVB-T of VHF and UHF carrier wave to use COFDM modulation system.
In the content of transmission, except audio & video transmission, DVB also defines the data communication standard (DVB-DATA) of band return path (DVB-RC).It supports several medium, comprises DECT, GSM, PSTN, ISDN etc.Also support some agreements, comprise DVB-IPI:InternetProtocol, DVB-NPI:networkprotocolindependent.
DVB standard is widely used, DVB-S and DVB-C issued in 1994, and DVB-T issued in 1997.First commercial DVB-T broadcast system is set up in 1998 by the DigitalTerrestrialGroup of Britain (DTG), in 2003, Berlin, Germany becomes the area that first thoroughly breaks anolog TV signals, many European countries prepare to break PAL/SECAM in 2010, realize comprehensive Digital Television.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 the Asia of majority, Africa and South American nations, wired and satellite have employed DVB standard.Except South American nations not yet determine terrestrial broadcasting standard (DTTV), all the other countries have determined to adopt DVB-T standard.
But, existing DVB transmission is a kind of transmission mode of perfect condition, for the user received, often occurs receive channel bad luck and causes the discontinuous situation about even cannot watch of picture, if signal quality is crossed difference and is continued for a good while, on the one hand, user's impression is very uncomfortable, on the other hand, too increase power consumption for no reason, in view of this, in existing transmission means, lack the instruction to interchannel noise, also lack the formulation of the different transmission policys corresponding with different channels quality.And the adding of this instruction and formulation, the impact for transmit leg and recipient is simultaneous.
Therefore, need a kind of DVB-C of reception channel form and the terminal play according to the receiving digital television signal carrying out that channel quality condition changes receive mode of self adaptation, to transmit leg packing transmission normal data and error code process after master data receive simultaneously, and detect the quality condition of current receive channel in time, when channel quality is excellent, maintain original DVB receive mode constant, receive normal data, when the quality that channel quality generally even has influence on Received signal strength reaches to a certain degree, abandon the demultiplexing process of normal data, to ensureing that the master data of data continuity carries out demultiplexing process through further error code process, obtain coherent audio-video signal, work as extreme case, when channel quality is very bad, abandon meaningless Signal reception, save the energy consumption of terminal.
Summary of the invention
In order to solve the problem, the invention provides a kind of DVB-C of reception channel form and the terminal play according to the receiving digital television signal carrying out that channel quality condition changes receive mode of self adaptation, make recipient need not be entangled with the impact of receive channel on signal of different quality under varying environment, and automatically change suitable reception strategy, ensure the coherent reception of various data in Digital Television, simultaneously, the introducing of the resting state in bad receive channel situation, saves the electricity consumption spending of user terminal.
According to an aspect of the present invention, provide a kind of receiving digital television signal and carry out the terminal play, comprise signal strength detection module and digital television signal receiving system, respectively digital intensity of TV signal is detected, to digital radio TV signals receiving and process; The reception of the strong and weak control figure TV signal of digital television signal that digital television signal receiving system detects according to signal strength detection module and process.
More specifically, described receiving digital television signal the terminal of carrying out playing comprise further: quadrature amplitude modulation qam demodulator, by cable TV DVB-C channel receiving digital television signal, and the digital television signal that QAM demodulation receives, export two paths of signals and I road signal, Q road signal, signal strength detection module, detects the intensity of the digital television signal received, and produces signal strength signal intensity control signal, front end processing device, connect qam demodulator to receive I road signal, Q road signal, and the operation that matched filtering maps to byte with balanced, differential coding and symbol is carried out to I road signal, Q road signal, export the byte corresponding with the qam symbol that I road signal, Q road signal map obtain, convolutional deinterleaver, connect front end processing device with receive its export byte, and the byte received is carried out the degree of depth be 12 convolution deinterleave, export convolution deinterleave after error protection bag, first reed-solomon RS decoder, connect convolutional deinterleaver, RS(204 carried out, 188 to the error protection bag received) decoding, export the packet of 188 bytes, the packet of described 188 bytes is the transport stream TS stream of Motion Picture Experts Group MPEG-2 frame structure, sync byte reverses and goes randomisation means, connects a RS decoder, by the TS diffluence randomization of MPEG-2 frame structure, and the sync byte SYNC1 byte in going the TS after randomization to flow is reversed, first Deplexing apparatus, carries out demultiplexing to the TS stream after reversion, exports two paths of data, and a circuit-switched data is the normal data TS stream of 188 bytes, and another road is the master data TS stream of 188 bytes, Signal reception control device, connection signal intensity detection module and the first Deplexing apparatus, received signal strength control signal respectively, normal data TS stream and master data TS stream, when channel strength control signal is less than or equal to 40dBuV, stop the reception to this digital television signal and process, control described terminal subsequently and enter holding state, when channel strength control signal is greater than 40dBuV and is less than or equal to 60dBuV, export the master data TS stream of 188 bytes, when channel strength control signal is greater than 80dBuV, export the normal data TS stream of 188 bytes, one TS flows de-packetizer, and connection signal receiving control device also receives the master data TS stream of 188 bytes, and to be unpacked by the master data TS stream of 188 bytes be the error protection bag of 204 bytes, 2nd RS decoder, connect a TS flow de-packetizer and receive the error protection bag that a TS flows 204 bytes that de-packetizer exports, and carry out RS(204,188) decode, export the packet of 188 bytes, the packet of described 188 bytes is the transport stream TS stream of Motion Picture Experts Group MPEG-2 frame structure, second Deplexing apparatus, connection signal receiving control device and the 2nd RS decoder, TS stream after the Xie Wumabaohubao that the normal data TS stream of 188 bytes exported with Received signal strength receiving control device or the 2nd RS decoder export, and de-multiplex operation is carried out, output sound video data and additional data to the TS stream received, voice data processing unit, connects the second Deplexing apparatus with audio reception data, carries out audio decompression, digital-to-analogue conversion operation, and export simulated audio signal to voice data, video data processing element, connects the second Deplexing apparatus with receiving video data, carries out video decompression operation to video data, and exports the digital video signal after decompressing, two loud speakers, are respectively left channel loudspeaker and right channel loudspeaker, connect voice data processing unit to receive simulated audio signal and to export the left channel audio signal corresponding with simulated audio signal and right channel audio signal respectively, drive device for display, connects video data processing element and receives the digital video signal after decompressing, and is carried out driving process to export the video data of applicable LCDs display by the digital video signal after decompressing, LCD liquid crystal display screen, connects drive device for display and receives the video data after driving process, being shown on its screen by described video data, power management module, the power supply running status of each device in office terminal, wherein, LCD liquid crystal display screen curtain is static drive (Static) LCDs, simple matrix drives in (SimpleMatrix) LCDs and active matrix drive (ActiveMatrix) LCDs any one, wherein, Signal reception control device controls described terminal and enters holding state, it is the power management module by Signal reception control device being connected to described terminal, control the power supply of other devices in described terminal except signal strength detection module and power management module, make other devices in described terminal except signal strength detection module and power management module carry out resting state, 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, and described load comprises the MPEG-2 data of 184 bytes.Wherein, digital television signal receiving system comprise quadrature amplitude modulation qam demodulator, front end processing device, convolutional deinterleaver, a RS decoder, sync byte reversion with remove randomisation means, the first Deplexing apparatus, Signal reception control device, a TS flows de-packetizer, the 2nd RS decoder, the second Deplexing apparatus, voice data processing unit, video data processing element, two loud speakers, drive device for display, LCD liquid crystal display screen and power management modules.
More specifically, described receiving digital television signal the terminal of carrying out playing comprise further: described TS flows specifically being distributed as of three other bytes in packet header, 1 transmission error code indication bit position, 1 initial indication bit position of clean data cell, 1 is transmitted priority bit position, 13 bag identifier PID bits, 2 are transmitted scrambling control bits position, control bit position, 2 self adaptation districts and 4 continuous counter bits.
More specifically, described receiving digital television signal the terminal of carrying out playing comprise further: when the intensity channel strength control signal that signal strength detection module detects is greater than 40dBuV, power management module controls the power supply of other devices in described terminal except signal strength detection module and power management module, makes other devices in described terminal except signal strength detection module and power management module exit resting state.
More specifically, described receiving digital television signal the terminal of carrying out playing comprise further: described terminal also comprises state indicator module, is used to indicate described terminal and whether is in resting state.
Accompanying drawing explanation
Below with reference to accompanying drawing, embodiment of the present invention are described, wherein:
The receiving digital television signal that Fig. 1 illustrates according to an embodiment of the present invention also carries out the block diagram of the terminal play.
Wherein, 1, qam demodulator; 2, front end processing device; 3, convolutional deinterleaver; 4, a RS decoder; 5, sync byte reverses and goes randomisation means; 6, signal strength detection module; 7, Signal reception control module; 8, the first Deplexing apparatus; 9, a TS flows de-packetizer; 10, a RS decoder; 11, the first Deplexing apparatus; 12, voice data processing unit; 13, video data processing element; 14, two loud speakers; 15, drive device for display; 16, LCD liquid crystal display screen; 17, power management module.
Embodiment
Below with reference to accompanying drawings to receiving digital television signal of the present invention and the embodiment of the terminal play be described in detail.
Fig. 1 illustrates the receiving digital television signal that illustrates according to an embodiment of the present invention and carries out the block diagram of the terminal play.Wherein receive DVB-C channel form self adaptation and change the receiving digital television signal of receive mode according to channel quality condition and the terminal of carrying out playing comprises: signal strength detection module 6 and digital television signal receiving system, respectively digital intensity of TV signal is detected, to digital radio TV signals receiving and process; The reception of the strong and weak control figure TV signal of digital television signal that digital television signal receiving system detects according to signal strength detection module 6 and process.Wherein, digital television signal receiving system comprises quadrature amplitude modulation qam demodulator 1, front end processing device 2, convolutional deinterleaver 3, first reed-solomon RS decoder 4, sync byte reverses and goes randomisation means 5, first Deplexing apparatus 8, Signal reception control device 7, one TS flows de-packetizer 9, 2nd RS decoder 10, second Deplexing apparatus 11, voice data processing unit 12, video data processing element 13, two loud speakers 14, drive device for display 15, LCD liquid crystal display screen 16 and power management module 17, quadrature amplitude modulation qam demodulator 1, by cable TV DVB-C channel receiving digital television signal, and the digital television signal that QAM demodulation receives, export two paths of signals and I road signal, Q road signal, signal strength detection module 6, detects the intensity of the digital television signal received, and produces signal strength signal intensity control signal, front end processing device 2, connect qam demodulator 1 to receive I road signal, Q road signal, and the operation that matched filtering maps to byte with balanced, differential coding and symbol is carried out to I road signal, Q road signal, export the byte corresponding with the qam symbol that I road signal, Q road signal map obtain, convolutional deinterleaver 3, connect front end processing device 2 with receive its export byte, and the byte received is carried out the degree of depth be 12 convolution deinterleave, export convolution deinterleave after error protection bag, first reed-solomon RS decoder 4, connect convolutional deinterleaver 3, RS(204 carried out, 188 to the error protection bag received) decoding, export the packet of 188 bytes, the packet of described 188 bytes is the transport stream TS stream of Motion Picture Experts Group MPEG-2 frame structure, sync byte reverses and goes randomisation means 5, connects a RS decoder 4, by the TS diffluence randomization of MPEG-2 frame structure, and the sync byte SYNC1 byte in going the TS after randomization to flow is reversed, first Deplexing apparatus 8, carries out demultiplexing to the TS stream after reversion, exports two paths of data, and a circuit-switched data is the normal data TS stream of 188 bytes, and another road is the master data TS stream of 188 bytes, Signal reception control device 7, connection signal intensity detection module 6 and the first Deplexing apparatus 8, received signal strength control signal respectively, normal data TS stream and master data TS stream, when channel strength control signal is less than or equal to 40dBuV, stop the reception to this digital television signal and process, control described terminal subsequently and enter holding state, when channel strength control signal is greater than 40dBuV and is less than or equal to 60dBuV, export the master data TS stream of 188 bytes, when channel strength control signal is greater than 80dBuV, export the normal data TS stream of 188 bytes, one TS flows de-packetizer 9, and connection signal receiving control device 7 also receives the master data TS stream of 188 bytes, and to be unpacked by the master data TS stream of 188 bytes be the error protection bag of 204 bytes, 2nd RS decoder 10, connect a TS flow de-packetizer 9 and receive the error protection bag that a TS flows 204 bytes that de-packetizer 9 exports, and carry out RS(204,188) decode, export the packet of 188 bytes, the packet of described 188 bytes is the transport stream TS stream of Motion Picture Experts Group MPEG-2 frame structure, second Deplexing apparatus 11, connection signal receiving control device 7 and the 2nd RS decoder 10, TS stream after the Xie Wumabaohubao that the normal data TS stream of 188 bytes exported with Received signal strength receiving control device 7 or the 2nd RS decoder 10 export, and de-multiplex operation is carried out, output sound video data and additional data to the TS stream received, voice data processing unit 12, connects the second Deplexing apparatus 11 with audio reception data, carries out audio decompression, digital-to-analogue conversion operation, and export simulated audio signal to voice data, video data processing element 13, connects the second Deplexing apparatus 11 with receiving video data, carries out video decompression operation to video data, and exports the digital video signal after decompressing, two loud speakers 14, are respectively left channel loudspeaker and right channel loudspeaker, connect voice data processing unit 12 to receive simulated audio signal and to export the left channel audio signal corresponding with simulated audio signal and right channel audio signal respectively, drive device for display 15, connects video data processing element 13 and receives the digital video signal after decompressing, and is carried out driving process to export the video data of applicable LCDs display by the digital video signal after decompressing, LCD liquid crystal display screen 16, connects drive device for display 15 and receives the video data after driving process, being shown on its screen by described video data, power management module 17, the power supply running status of each device in office terminal, wherein, LCD liquid crystal display screen curtain 16 is static drive (Static) LCDs, simple matrix drives in (SimpleMatrix) LCDs and active matrix drive (ActiveMatrix) LCDs any one, wherein, Signal reception control device 7 controls described terminal and enters holding state, it is the power management module 17 by Signal reception control device 7 being connected to described terminal, control the power supply of other devices in described terminal except signal strength detection module 6 and power management module 17, make other devices in described terminal except signal strength detection module 6 and power management module 17 carry out resting state, 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, and described load comprises the MPEG-2 data of 184 bytes.
Wherein, QAM(QuadratureAmplitudeModulation) digital modulator is as the headend equipment of DVB system, the TS received from equipment such as encoder, multiplexer, DVB gateway, video servers flows, carry out RS coding, convolutional encoding and QAM digital modulation, the radiofrequency signal exported can directly transmit on cable television network, also can intermediate frequency be selected as required to export simultaneously.He configures and superior performance index flexibly with it, is widely used in digital cable TV transmission field and Digital MMDS System.QAM be with two-way independently baseband signal carrier-suppressed double sideband amplitude modulation is carried out to two mutually orthogonal same frequency carrier waves, utilize the orthogonality of the frequency spectrum of this modulated signal in same bandwidth, realize the transmission of the digital information that two-way walks abreast.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 respectively, 16,64 ... individual vector end-points.Relation between level number m and signal condition M is for 4QAM, and when two paths of signals amplitude is equal, its generation, demodulation, performance and phase vectors are all identical with 4PSK.
Wherein, Reed Solomon code (inner institute code, Reed-solomoncodes are called for short RScodes) is the chnnel coding of a kind of forward error corrigendum, effective to the multinomial produced by correction over-sampling data.First cataloged procedure asks redundancy to these multinomials on multiple point, is then transmitted or stores.Must sample make multinomial overdetermination (cross limit) to the polynomial this essential value that exceeds.When receiver correct receive enough points after, it just can recover original multinomial, even if the multinomial received has a lot of point by noise jamming distortion.Reed Solomon code is widely used in various commercial use, is the use on CD, DVD and Blu-ray Disc the most significantly; In the data transmission, it is also used to DSL and WiMAX; In broadcast system, DVB and ATSC also flashes its figure; 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 output data of a regular length.Such as, in (255,223) RS encodes, 223 Read-Solomon incoming symbols (each symbol has 8 bits) are encoded into 255 output symbols.Most of Read-Solomon error correction coding flow process is architectonical, this means that in the code word exported, some contains the primitive form of input data.Symbol size is 255 symbols for institute's code in 8 bits forces code length (code length) the longest.
In addition, described receiving digital television signal the terminal of carrying out playing comprise further: described TS flows specifically being distributed as of three other bytes in packet header, 1 transmission error code indication bit position, 1 initial indication bit position of clean data cell, 1 is transmitted priority bit position, 13 bag identifier PID bits, 2 are transmitted scrambling control bits position, control bit position, 2 self adaptation districts and 4 continuous counter bits.
Wherein, MPEG-2 is the Audio and Video compression international standard that MPEG working group issued in 1994.MPEG-2 is commonly used to, for broadcast singal provides Audio and Video to encode, comprise satellite television, cable TV etc.MPEG-2, after revising on a small quantity, also becomes the core technology of DVD product.The system of MPEG-2 describes part (part 1) and defines transport stream, and it is used for one being enclosed within the mechanism non-reliable medium being transmitted digital video signal and audio signal, is mainly used in field of broadcast televisions.The Part II of MPEG-2 and video section and MPEG-1 similar, but it provides the support to interlaced scanning video display mode (interlacing scan is widely used in field of broadcast televisions).MPEG-2 video is not optimized low bit speed rate (being less than 1Mbps), and under 3Mbit/s and above bit rate situation, MPEG-2 is obviously better than MPEG-1.MPEG-2 back compatible, in other words, all standard compliant MPEG-2 decoders also can normal play MPEG-1 video flowing.MPEG-2 technology has also been applied in HDTV transmission system and Blu-ray Disc.
In addition, described receiving digital television signal the terminal of carrying out playing comprise further: when the intensity channel strength control signal that signal strength detection module 6 detects is greater than 40dBuV, power management module 17 controls the power supply of other devices in described terminal except signal strength detection module 6 and power management module 17, makes other devices in described terminal except signal strength detection module 6 and power management module 17 exit resting state.
In addition, described receiving digital television signal the terminal of carrying out playing comprise further: described terminal also comprises state indicator module, is used to indicate described terminal and whether is in resting state.Like this, user can understand the running status of terminal immediately, when receiving system dormancy, can not take for the puzzled of equipment fault occur because not understanding its running status.
Adopt receiving digital television signal of the present invention and carry out the terminal play, greatly improve original inflexible DVB transmission mode, carrying out in digital television signal transmission and reception, take into full account the quality of transmission channel, and self-adaptative adjustment receives strategy, when increasing volume of transmitted data and being few, ensure that user watches that with the video and audio signal of uppick be complete and continuous print, simultaneously, when extreme bad receive channel quality, timely adjustment related receiving apparatus, it is made to enter the resting state that can activate, avoid meaningless power consumption, improve the intelligence degree that digital TV data sends and receives.
Be understandable that, although the present invention with preferred embodiment disclose as above, but above-described embodiment and be not used to limit the present invention.For any those of ordinary skill in the art, do not departing under technical solution of the present invention ambit, the technology contents of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solution of the present invention, or be revised as the Equivalent embodiments of equivalent variations.Therefore, every content not departing from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent variations and modification, all still belongs in the scope of technical solution of the present invention protection.
Claims (1)
1. the terminal play of receiving digital television signal carrying out, it is characterized in that, described terminal comprises:
Signal strength detection module, detects digital intensity of TV signal;
Digital television signal receiving system, to digital radio TV signals receiving and process;
The reception of the strong and weak control figure TV signal of digital television signal that digital television signal receiving system detects according to signal strength detection module and process;
Also comprise:
Described digital television signal receiving system comprises quadrature amplitude modulation qam demodulator, front end processing device, convolutional deinterleaver, first reed-solomon RS decoder, sync byte reverses and goes randomisation means, first Deplexing apparatus, Signal reception control device, first transport stream TS stream de-packetizer, 2nd RS decoder, second Deplexing apparatus, voice data processing unit, video data processing element, two loud speakers, drive device for display, LCD liquid crystal display screen and power management module,
Quadrature amplitude modulation qam demodulator, by cable TV DVB-C channel receiving digital television signal, and the digital television signal that QAM demodulation receives, export two paths of signals and I road signal, Q road signal;
Described signal strength detection module detects the intensity of the digital television signal received, and produces signal strength signal intensity control signal;
Front end processing device, connect qam demodulator to receive I road signal, Q road signal, and the operation that matched filtering maps to byte with balanced, differential coding and symbol is carried out to I road signal, Q road signal, export the byte corresponding with the qam symbol that I road signal, Q road signal map obtain;
Convolutional deinterleaver, connect front end processing device with receive described front end processing device export byte, and the byte received is carried out the degree of depth be 12 convolution deinterleave, export convolution deinterleave after error protection bag;
First reed-solomon RS decoder, connect convolutional deinterleaver, RS (204,188) decoding is carried out to the error protection bag received, export the packet of 188 bytes, the packet of described 188 bytes is the transport stream TS stream of Motion Picture Experts Group MPEG-2 frame structure;
Sync byte reverses and goes randomisation means, connects a RS decoder, by the TS diffluence randomization of MPEG-2 frame structure, and the sync byte SYNC1 byte in going the TS after randomization to flow is reversed;
First Deplexing apparatus, carries out demultiplexing to the TS stream after reversion, exports two paths of data, and a circuit-switched data is the normal data TS stream of 188 bytes, and another road is the master data TS stream of 188 bytes;
Signal reception control device received signal strength control signal, connection signal intensity detection module receives normal data TS stream and the first Deplexing apparatus receives master data TS stream, when channel strength control signal is less than or equal to 40dBuV, stop the reception to this digital television signal and process, control described terminal subsequently and enter holding state, when channel strength control signal is greater than 40dBuV and is less than or equal to 60dBuV, export the master data TS stream of 188 bytes, when channel strength control signal is greater than 80dBuV, export the normal data TS stream of 188 bytes;
One TS flows de-packetizer, and connection signal receiving control device also receives the master data TS stream of 188 bytes, and to be unpacked by the master data TS stream of 188 bytes be the error protection bag of 204 bytes;
2nd RS decoder, connect a TS flow de-packetizer and receive the error protection bag that a TS flows 204 bytes that de-packetizer exports, and carry out RS (204,188) decode, export the packet of 188 bytes, the packet of described 188 bytes is the transport stream TS stream of Motion Picture Experts Group MPEG-2 frame structure;
Second Deplexing apparatus, connection signal receiving control device and the 2nd RS decoder, TS stream after the Xie Wumabaohubao that the normal data TS stream of 188 bytes exported with Received signal strength receiving control device or the 2nd RS decoder export, and de-multiplex operation is carried out, output sound video data and additional data to the TS stream received;
Voice data processing unit, connects the second Deplexing apparatus with audio reception data, carries out audio decompression, digital-to-analogue conversion operation, and export simulated audio signal to voice data;
Video data processing element, connects the second Deplexing apparatus with receiving video data, carries out video decompression operation to video data, and exports the digital video signal after decompressing;
Two loud speakers, are respectively left channel loudspeaker and right channel loudspeaker, connect voice data processing unit to receive simulated audio signal and to export the left channel audio signal corresponding with simulated audio signal and right channel audio signal respectively;
Drive device for display, connects video data processing element and receives the digital video signal after decompressing, and is carried out driving process to export the video data of applicable LCDs display by the digital video signal after decompressing;
LCD liquid crystal display screen, connects drive device for display and receives the video data after driving process, being shown by described video data on screen;
Power management module, the power supply running status of each device in office terminal;
Wherein, LCD liquid crystal display screen curtain is any one in static driving lcd, simple matrix driving LCDs and active matrix drive LCDs;
Wherein, Signal reception control device controls described terminal and enters holding state, it is the power management module by Signal reception control device being connected to described terminal, control the power supply of other devices in described terminal except signal strength detection module and power management module, make other devices in described terminal except signal strength detection module and power management module carry out resting state;
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, and described load comprises the MPEG-2 data of 184 bytes.
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| CN101150674A (en) * | 2006-09-20 | 2008-03-26 | 南京Lg同创彩色显示系统有限责任公司 | Booster operation control method and its circuit of TV receiver |
| CN101383915A (en) * | 2007-09-07 | 2009-03-11 | 深圳市爱国者嵌入式系统科技有限公司 | Portable digital television receiving terminal |
| WO2009118971A1 (en) * | 2008-03-27 | 2009-10-01 | パナソニック株式会社 | Digital broadcast receiver and digital broadcast reception method |
| CN201374765Y (en) * | 2008-12-17 | 2009-12-30 | 中国华录集团有限公司 | Weak signal detection system of multi-media advertisement player |
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