CN105208432A - DVB-C receiver with AVS decoding - Google Patents
DVB-C receiver with AVS decoding Download PDFInfo
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- CN105208432A CN105208432A CN201510650219.0A CN201510650219A CN105208432A CN 105208432 A CN105208432 A CN 105208432A CN 201510650219 A CN201510650219 A CN 201510650219A CN 105208432 A CN105208432 A CN 105208432A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
- H04N21/4341—Demultiplexing of audio and video streams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
- H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
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- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
Abstract
The invention relates to a DVB-C receiver with AVS decoding. The DVB-C receiver comprises a signal receiving module, an external network interface, a demultiplexing module, an AVS audio decoding module, an AVS video decoding module and an audio and video synchronization module. The signal receiving module receives and processes digital television signals to obtain a transmission stream (TS), the external network interface receives and sends the TS to an external network, the demultiplexing module receives the TS and conducts demultiplexing, the AVS audio decoding module conducts AVS audio decoding on AVS audio coding data obtained after demultiplexing, the AVS video decoding module conducts AVS video decoding on AVS video coding data obtained after demultiplexing, and the audio and video synchronization module maintains decoding synchronization of the AVS audio decoding module and the AVS video decoding module. By means of the DVB-C receiver with AVS decoding, AVC coding data in received digital television broadcasting signals can be decompressed, and needed audio and video content is played for users.
Description
The divisional application of the patent of " the DVB-C receiver using AVS decoding " that the present invention is application number is 201310179115.7, the applying date, to be May 15, denomination of invention in 2013 be.
Technical field
The present invention relates to audio/video encoding/decoding field, particularly relate to a kind of DVB-C receiver using AVS to decode.
Background technology
AVS coding is the second generation source coding standard of China's designs, and be the abbreviation of advanced audio/video coding, he comprises system, video, audio frequency, digital copyright management four main technical standards and symbol testing standard.AVS coding utilizes the digital television transmission system towards SD can directly provide high definition business, and technical scheme is succinct, chip implementation complexity is low, meet or exceed the code efficiency of relevant mpeg standard standard, become an important branch of following audio/video encoding/decoding development, its industry relates to multiple industrial chains such as chip, software and complete machine.
But, in more existing digital television receivers, still use traditional MPEG encoding and decoding standard, when receiving the audio, video data wherein carrying AVS coding, because cannot carry out decoding and cannot providing deserved TV service for TV user, meanwhile, existing digital television receiver structure is single, do not have the function realizing realizing with network and the outside audio-video signal memory device of multiple format intercoming mutually, applicability is poor.
Therefore, need a kind of DVB-C receiver using AVS to decode, the original DVB-C receiver adopting mpeg decode standard of transformation, the digital TV broadcast signal carrying AVC coding audio/video data can be received, for spectators user represents the audio-video frequency content of high-quality, meanwhile, the audio, video data in digital TV broadcast signal can be sent to external communication network, and the outside audio-video signal of multiple format can be received, thus expand the application market of digital television receiver.
Summary of the invention
In order to solve the problem, the invention provides a kind of DVB-C receiver using AVS to decode, AVC audio decoder and AVC Video Decoder is adopted to decode to the AVC coding audio/video data received, the TS be demultiplexed into from digital TV broadcast signal stream is played UDP bag to be sent to external network for network user's viewing simultaneously, the data-interface that the compatibility also using FPGA to realize in addition is strong receives the audio-video signal of multiple format, ensure the reception of AVC coding audio-visual signal, enrich the application function of digital television receiver.
According to an aspect of the present invention, provide a kind of DVB-C receiver using AVS to decode, comprise signal receiving module, external network interface, demultiplexing module, AVS audio decoder module, AVS Video decoding module and audio-visual synchronization module, signal receiving module receives and processes digital television signal to obtain transport stream TS stream, external network interface receives described TS and flows and be sent to external network, demultiplexing module receives described TS and flows and carry out demultiplexing, AVS audio decoder module, AVS Video decoding module is to the AVS coded audio data obtained after demultiplexing, AVS video data encoder carries out AVS audio decoder respectively, AVS video decode, audio-visual synchronization module keeps AVS audio decoder module, the decoding of AVS Video decoding module is synchronous.
More specifically, the DVB-C receiver of described use AVS decoding comprises further: quadrature amplitude modulation QAM demodulation module, 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; Front end processing block, connect QAM demodulation module 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; Convolution deinterleaves module, connects the byte that front end processing block exports to receive described front end processing block, and the byte received is carried out the degree of depth be 12 convolution deinterleave, export convolution deinterleave after error protection bag; Reed-solomon RS decoder module, connect convolution to deinterleave module, 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 TS stream of Motion Picture Experts Group MPEG-2 frame structure; Sync byte reverses and goes randomization module, connects RS decoder module, 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; IP packetization module, connects sync byte reversion and goes randomization module to flow to receive the TS after reversing, and splitting the TS stream after reversion, the data after segmentation is beaten as IP bag; UDP packetization module, connects described IP packetization module and wraps to receive described IP, and splits described IP bag, the data after segmentation is beaten as UDP bag; External network interface, connects described UDP packetization module, transmits to receive described UDP bag and to be delivered on external network by described UDP bag; Demultiplexing module, connect sync byte reversion and go randomization module to flow to receive the TS after reversing, and demultiplexing is carried out to obtain audio TS bag, video TS bag, Program Association Table PAT, the Program Map Table PMT of digital television program and to serve description list SDT to the TS stream after reversion, audio TS bag, video TS bag, Program Association Table PAT, Program Map Table PMT and service description list SDT have different Packet Identifier PID, and described PID is used to be responsible for assigning the identifier of different value for different types of data in TS stream; Separate TS bag module, connect described demultiplexing module to wrap with audio reception TS bag, video TS, and XieTSBao is carried out to audio TS bag, video TS bag, to obtain respectively, audio frequency PES wraps, video PES wraps, described PES bag is Digital Television elementary stream, by packing to compressed audio coding data, video compression coding data and add that PES packet header is formed, wherein compressed audio coding data, video compression coding data acquisition be advanced audio/video coding AVS coding; Separate PES bag module, connect described solution TS bag module and wrap with audio reception PES bag, video PES, and XiePESBao is carried out to audio frequency PES bag, video PES bag, obtain compressed audio coding data, video compression coding data; AVS audio decoder module, connects described solution PES bag module to obtain compressed audio coding data, uses AVS audio decoder to compressed audio coding decoding data, obtains audio signal; AVS Video decoding module, connects described solution PES bag module to obtain video compression coding data, uses AVS video decode to video compression coding decoding data, obtains vision signal; Audio-visual synchronization module, connects described AVS audio decoder module and described AVS Video decoding module, and the audio signal needing simultaneously to play, the AVS audio decoder of vision signal difference correspondence, AVS video decode are kept synchronous; Left and right acoustic channels loud speaker, connects described AVS audio decoder module to obtain audio signal, and plays audio signal; LCDs, connects described AVS Video decoding module to obtain vision signal, and plays vision signal; Unified signal interface module, connect left and right acoustic channels loud speaker and LCDs, fpga chip is adopted to realize the connection of the outside audio-video signal of compatible DVI, HDMI and DisplayPort form, and by the outside audio-video signal retransmission that receives to left and right acoustic channels loud speaker and LCDs to carry out the broadcasting of audio-video signal, described fpga chip is the Virtex4LX25 of Xilinx company; Wherein, described signal receiving module comprise QAM demodulation module, front end processing block, convolution deinterleave the reversion of module, RS decoder module and sync byte with go randomization module; Wherein, Program Association Table PAT is the PID for obtaining each program in described digital video broadcast-satellite signal, from described Program Map Table PMT, obtain the PID of PID, the video data TS stream that voice data TS corresponding to each program flows according to the PID of each program, from described service describing table SDT, obtain the programm name of each program according to the PID of each program.
More specifically, the DVB-C receiver of described use AVS decoding comprises further: the outside audio-video signal of described DVI, HDMI and DisplayPort form is from outside audio/video storage device.
More specifically, the DVB-C receiver of described use AVS decoding comprises further: described demultiplexing module carries out network information table NIT, the BAT bouquet association table BAT or service information list SDT that demultiplexing also obtains business information SI, for the parsing of electronic program guide (EPG) information to the TS stream after reversion.
More specifically, the DVB-C receiver of described use AVS decoding comprises further: the TCP packetization module substituting UDP packetization module, described TCP packetization module connects described IP packetization module and wraps to receive described IP, and described IP bag is split, the data after segmentation are beaten for TCP bag is transmitted to be delivered on external network by external network interface.
Accompanying drawing explanation
Below with reference to accompanying drawing, embodiment of the present invention are described, wherein:
The block diagram of the DVB-C receiver that the use AVS that Fig. 1 illustrates according to an embodiment of the present invention decodes.
Wherein, 1, signal receiving module; 2, demultiplexing module; 3, external network interface; 4, AVS Video decoding module; 5, audio-visual synchronization module; 6, AVS audio decoder module.
Embodiment
Below with reference to accompanying drawings the embodiment of the DVB-C receiver of use AVS of the present invention decoding is described in detail.
Fig. 1 illustrates the block diagram of the DVB-C receiver that the use AVS illustrated according to an embodiment of the present invention decodes.Wherein said DVB-C receiver comprises, signal receiving module 1, external network interface 3, demultiplexing module 2, AVS audio decoder module 4, AVS Video decoding module 6 and audio-visual synchronization module 5, signal receiving module 1 receives and processes digital television signal to obtain transport stream TS stream, external network interface 3 receives described TS and flows and be sent to external network, demultiplexing module 2 receives described TS and flows and carry out demultiplexing, AVS audio decoder module 4, the AVS coded audio data obtained after AVS Video decoding module 6 pairs of demultiplexings, AVS video data encoder carries out AVS audio decoder respectively, AVS video decode, audio-visual synchronization module 5 keeps AVS audio decoder module 4, the decoding of AVS Video decoding module 6 is synchronous.Further, the DVB-C receiver of described use AVS decoding also comprises, and quadrature amplitude modulation QAM demodulation module, 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; Front end processing block, connect QAM demodulation module 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; Convolution deinterleaves module, connects the byte that front end processing block exports to receive described front end processing block, and the byte received is carried out the degree of depth be 12 convolution deinterleave, export convolution deinterleave after error protection bag; Reed-solomon RS decoder module, connect convolution to deinterleave module, 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 TS stream of Motion Picture Experts Group MPEG-2 frame structure; Sync byte reverses and goes randomization module, connects RS decoder module, 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; IP packetization module, connects sync byte reversion and goes randomization module to flow to receive the TS after reversing, and splitting the TS stream after reversion, the data after segmentation is beaten as IP bag; UDP packetization module, connects described IP packetization module and wraps to receive described IP, and splits described IP bag, the data after segmentation is beaten as UDP bag; External network interface 3, connects described UDP packetization module, transmits to receive described UDP bag and to be delivered on external network by described UDP bag; Demultiplexing module 2, connect sync byte reversion and go randomization module to flow to receive the TS after reversing, and demultiplexing is carried out to obtain audio TS bag, video TS bag, Program Association Table PAT, the Program Map Table PMT of digital television program and to serve description list SDT to the TS stream after reversion, audio TS bag, video TS bag, Program Association Table PAT, Program Map Table PMT and service description list SDT have different Packet Identifier PID, and described PID is used to be responsible for assigning the identifier of different value for different types of data in TS stream; Separate TS bag module, connect described demultiplexing module 2 to wrap with audio reception TS bag, video TS, and XieTSBao is carried out to audio TS bag, video TS bag, to obtain respectively, audio frequency PES wraps, video PES wraps, described PES bag is Digital Television elementary stream, by packing to compressed audio coding data, video compression coding data and add that PES packet header is formed, wherein compressed audio coding data, video compression coding data acquisition be advanced audio/video coding AVS coding; Separate PES bag module, connect described solution TS bag module and wrap with audio reception PES bag, video PES, and XiePESBao is carried out to audio frequency PES bag, video PES bag, obtain compressed audio coding data, video compression coding data; AVS audio decoder module 4, connects described solution PES bag module to obtain compressed audio coding data, uses AVS audio decoder to compressed audio coding decoding data, obtains audio signal; AVS Video decoding module 6, connects described solution PES bag module to obtain video compression coding data, uses AVS video decode to video compression coding decoding data, obtains vision signal; Audio-visual synchronization module 5, connects described AVS audio decoder module 4 and described AVS Video decoding module 6, and the audio signal needing simultaneously to play, the AVS audio decoder of vision signal difference correspondence, AVS video decode are kept synchronous; Left and right acoustic channels loud speaker, connects described AVS audio decoder module 4 to obtain audio signal, and plays audio signal; LCDs, connects described AVS Video decoding module 6 to obtain vision signal, and plays vision signal; Unified signal interface module, connect left and right acoustic channels loud speaker and LCDs, fpga chip is adopted to realize the connection of the outside audio-video signal of compatible DVI, HDMI and DisplayPort form, and by the outside audio-video signal retransmission that receives to left and right acoustic channels loud speaker and LCDs to carry out the broadcasting of audio-video signal, described fpga chip is the Virtex4LX25 of Xilinx company; Wherein, described signal receiving module 1 comprise QAM demodulation module, front end processing block, convolution deinterleave the reversion of module, RS decoder module and sync byte with go randomization module; Wherein, Program Association Table PAT is the PID for obtaining each program in described digital video broadcast-satellite signal, from described Program Map Table PMT, obtain the PID of PID, the video data TS stream that voice data TS corresponding to each program flows according to the PID of each program, from described service describing table SDT, obtain the programm name of each program according to the PID of each program.
Wherein, AVS audio video encoding technology standard operation group is ratified to set up in June, 2002 by science and technology department of the Ministry of Information industry.The task of working group is, work out the common technology standards such as the compression of digital audio/video, decompression, process and expression, for digital audio/video equipment and system provide the encoding and decoding technique of high-efficiency and economic, serve the significant information industry application such as high-resolution digital broadcast, high-density laser digital storage media, wireless wideband multimedia communication, the Internet broadband Streaming Media.The source coding standard that current audio frequency and video industry can be selected has four: MPEG-2, MPEG-4, MPEG-4AVC (be called for short AVC, also claim JVT, H.264), AVS.Divide from enactor, first three standard is completed by MPEG expert group, and the 4th is the autonomous formulation of China.Divide from developing stage, MPEG-2 is first generation information source standard, and its excess-three is second generation standard.From the key technical indexes---code efficiency compares: MPEG-4 is 1.4 times of MPEG-2, AVS and AVC is suitable, is all more than MPEG-2 twice.
Wherein, PES stream is Digital Television elementary stream, in digital TV broadcast signal.Wherein, at signal transmitting terminal, audio frequency, video and other additional datas are carried out data compression through MPEG-2 encoder, form elementary stream, namely ES stream, ES stream again packing forms the code stream with packet header, is exactly PES (PacketizedElementaryStreams), the elementary stream of namely packing.Briefly, PES be ES stream packing, add packet header formed.
In addition, the DVB-C receiver of described use AVS decoding comprises further: the outside audio-video signal of described DVI, HDMI and DisplayPort form is from outside audio/video storage device.The unified signal interface module adopting fpga chip to realize can identify the form of outside audio-video signal automatically, and adopts corresponding signal transfer protocol to carry out the reception of audio, video data.
Wherein, DVI, HDMI, DisplayPort, DiiVA are digital audio/video interface standards common on market.DVI (DigitalVisualInterface), i.e. digital visual interface, by SiliconImage, Intel (Intel), Compaq (Compaq), IBM, HP (Hewlett-Packard), NEC, the companies such as Fujitsu (Fujitsu) form DDWG (DigitalDisplayWorkingGroup jointly, numerical monitor working group) in the interface standard of release in 1999, DVI is based on PanalLink interfacing, based on TMDS (transition minimized differential signaling) electronic protocol as basic electrical connection, highest signal transmission code stream is 1.65Gbps, analog video interface before comparing, it is fast that it has speed, picture is clear, support the feature of HDCP agreement.HDMI (HighDefinitionMultimediaInterface), i.e. HDMI (High Definition Multimedia Interface), by Hitachi, Panasonic, Philip, SiliconImage, Sony, Thomson, the HDMI high-definition media interface that company of Toshiba etc. 7 is set up jointly is organized in formally to be issued on December 9th, 2002, HDMI is based on DVI, adopt TMDS encoding mechanism, to vision signal, audio signal and control signal carry out time-division control, the maximum data transmission speed is 5Gbps, overcome DVI for panel TV and wide colour gamut terminal transparency poor, image copyright protection is lacked and supports, do not support digital audio and video signals, the shortcomings such as interface volume is large.DisplayPort, is called for short DP interface, is issued by VESA (video electronics standard tissue) in May, 2006.It is a kind of open standard for all display devices (comprising inside and outside interface); adopt 8B/10B coding, embedded clock signal and micro-package framework; video content is with the transmission of package mode; support HDCP digital content protection agreement; can simultaneously transmission of audio and video; maximum transmission bandwidth is 10.8Gb/S; it directly carries out the transmission of the low bandwidth data such as voice, video by the external channel that can realize two-way communication, and the DisplayPort HDMI that compares has larger transmission bandwidth and stronger compatibility.DiiVA, i.e. digital high-definition interaction interface, released in April, 2009 by 9 enterprises such as TCL, Hisense, Skyworth, Konka, Changhong, Haier, SVA, panda electronics, Ling Xu, adopt the 8B/10B coding techniques identical with DisplayPort interface, support that video bandwidth reaches 13.5Gbps, support that hybrid channel frequency range adds up to more than 2Gbps, bi-directional data and audio transmission can be done, also support HDCP2.0 and DTCP-IP simultaneously, it adopts the connected mode of daisy chain, and any one equipment in DiiVA network can be accessed mutually.Different consumer electronics producers, semiconductor company, testing equipment producer and commercial electronic manufacturer, according to number one needs, in the product of oneself, select different digital audio/video interfaces, these products comprise Digital Television, DVD, video tape recorder, computer, Set Top Box, video camera.
In addition, the DVB-C receiver of described use AVS decoding comprises further: described demultiplexing module 2 carries out network information table NIT, the BAT bouquet association table BAT or service information list SDT that demultiplexing also obtains business information SI, for the parsing of electronic program guide (EPG) information to the TS stream after reversion.
Wherein, EPG is the english abbreviation of ElectronicProgramGuide, is meant to electric program menu.Index and the navigation of the miscellaneous service that digital TV broadcast signal provides all have been come by EPG system.EPG interface generally all provides all kinds of menu, button, link etc. user can be supplied to select the assembly directly clicked during program, the interface of EPG also can comprise all kinds of dynamic or static content of multimedia browsed for user.
In addition, the DVB-C receiver of described use AVS decoding comprises further: the TCP packetization module substituting UDP packetization module, described TCP packetization module connects described IP packetization module and wraps to receive described IP, and described IP bag is split, the data after segmentation are beaten for TCP bag is transmitted to be delivered on external network by external network interface 3.
Wherein, IP is the abbreviation of English InternetProtocol (agreement interconnected between network), and Chinese, referred to as " net association ", namely carries out communicating and the agreement that designs for computer network is interconnected.In the internet, it to make to be connected to the set of rule that online all computer networks realize intercoming mutually, defines the rule should observed when computer communicates on the internet.The computer system of any manufacturer production, just can interconnect with internet as long as observe IP agreement.IP address has uniqueness, according to the difference of user's character, can fall into 5 types. in actual transport process, packet also want can according to change the length of packet through the packet size of network provision, the maximum length of IP packet can reach 65535 bytes (Byte) (1Byte=8bit).
Wherein, UDP is the abbreviation of UserDatagramProtocol, and Chinese name is User Datagram Protoco (UDP), is a kind of connectionless transport layer protocol in OSI Reference Model, there is provided the simple unreliable information transfer service towards affairs, IETFRFC768 is the formal specification of UDP.UDP is a kind of connectionless transport layer protocol in OSI Reference Model, and he is mainly used in the transmission not requiring order of packets to arrive, and the inspection of transmitted in packets order is completed by application layer with sequence, provides the simple unreliable information transfer service towards affairs.Udp protocol is the interface of IP agreement and upper-layer protocol substantially.Udp protocol is suitable for port and operates in multiple application programs on same equipment respectively.TCP, i.e. TransmissionControlProtocol transmission control protocol, be a kind of SCCP connection-oriented (connect guiding), reliably, based on transport layer (Transportlayer) communication protocol of byte stream, illustrated (specified) by the RFC793 of IETF.In the computer network osi model simplified, he completes the 4th layer of function specified by transport layer, and UDP is another important host-host protocol in same layer.
Adopt the DVB-C receiver of use AVS of the present invention decoding, for the technical problem that there is not AVC decoding in existing television receiver, increase AVC audio/video coding module, AVC coded data in digital TV broadcast signal is decoded, ensure watching of the audio-video frequency content of user, simultaneously for receiver provides AVC audio/video coding data network transmission function and multiple format audio, video data receiving function, enhance the compatibility of digital television receiver.
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 (2)
1. use the DVB-C receiver that AVS decodes, it is characterized in that, described receiver comprises:
Signal receiving module, external network interface, demultiplexing module, AVS audio decoder module, AVS Video decoding module and audio-visual synchronization module, signal receiving module receives and processes digital television signal to obtain transport stream TS stream, external network interface receives described TS and flows and be sent to external network, demultiplexing module receives described TS and flows and carry out demultiplexing, AVS audio decoder module, AVS Video decoding module is to the AVS coded audio data obtained after demultiplexing, AVS video data encoder carries out AVS audio decoder respectively, AVS video decode, audio-visual synchronization module keeps AVS audio decoder module, the decoding of AVS Video decoding module is synchronous.
2. the DVB-C receiver of AVS decoding as claimed in claim 1, is characterized in that, also comprise:
Quadrature amplitude modulation QAM demodulation module, 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;
Front end processing block, connect QAM demodulation module 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;
Convolution deinterleaves module, connects the byte that front end processing block exports to receive described front end processing block, and the byte received is carried out the degree of depth be 12 convolution deinterleave, export convolution deinterleave after error protection bag;
Reed-solomon RS decoder module, connect convolution to deinterleave module, 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 TS stream of Motion Picture Experts Group MPEG-2 frame structure;
Sync byte reverses and goes randomization module, connects RS decoder module, 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;
IP packetization module, connects sync byte reversion and goes randomization module to flow to receive the TS after reversing, and splitting the TS stream after reversion, the data after segmentation is beaten as IP bag;
UDP packetization module, connects described IP packetization module and wraps to receive described IP, and splits described IP bag, the data after segmentation is beaten as UDP bag;
Described external network interface connects described UDP packetization module, transmits to receive described UDP bag and to be delivered on external network by described UDP bag;
Described demultiplexing module connects sync byte reversion and goes randomization module to flow to receive the TS after reversing, and demultiplexing is carried out to obtain audio TS bag, video TS bag, Program Association Table PAT, the Program Map Table PMT of digital television program and to serve description list SDT to the TS stream after reversion, audio TS bag, video TS bag, Program Association Table PAT, Program Map Table PMT and service description list SDT have different Packet Identifier PID, and described PID is used to be responsible for assigning the identifier of different value for different types of data in TS stream;
Separate TS bag module, connect described demultiplexing module to wrap with audio reception TS bag, video TS, and XieTSBao is carried out to audio TS bag, video TS bag, to obtain respectively, audio frequency PES wraps, video PES wraps, described PES bag is Digital Television elementary stream, by packing to compressed audio coding data, video compression coding data and add that PES packet header is formed, wherein compressed audio coding data, video compression coding data acquisition be advanced audio/video coding AVS coding;
Separate PES bag module, connect described solution TS bag module and wrap with audio reception PES bag, video PES, and XiePESBao is carried out to audio frequency PES bag, video PES bag, obtain compressed audio coding data, video compression coding data;
Separate PES bag module described in described AVS audio decoder model calling to obtain compressed audio coding data, use AVS audio decoder to compressed audio coding decoding data, obtain audio signal;
Described AVS Video decoding module connects described solution PES bag module to obtain video compression coding data, uses AVS video decode to video compression coding decoding data, obtains vision signal;
AVS audio decoder module described in described audio-visual synchronization model calling and described AVS Video decoding module, keep synchronous by the audio signal needing to play, the AVS audio decoder of vision signal difference correspondence, AVS video decode simultaneously;
Left and right acoustic channels loud speaker, connects described AVS audio decoder module to obtain audio signal, and plays audio signal;
LCDs, connects described AVS Video decoding module to obtain vision signal, and plays vision signal;
Unified signal interface module, connect left and right acoustic channels loud speaker and LCDs, fpga chip is adopted to realize the connection of the outside audio-video signal of compatible DVI, HDMI and DisplayPort form, and by the outside audio-video signal retransmission that receives to left and right acoustic channels loud speaker and LCDs to carry out the broadcasting of audio-video signal, described fpga chip is the Virtex4LX25 of Xilinx company;
Wherein, described signal receiving module comprise QAM demodulation module, front end processing block, convolution deinterleave the reversion of module, RS decoder module and sync byte with go randomization module;
Wherein, Program Association Table PAT is the PID for obtaining each program in digital video broadcast-satellite signal, from described Program Map Table PMT, obtain the PID of PID, the video data TS stream that voice data TS corresponding to each program flows according to the PID of each program, from described service describing table SDT, obtain the programm name of each program according to the PID of each program;
The outside audio-video signal of described DVI, HDMI and DisplayPort form is from outside audio/video storage device;
Described demultiplexing module carries out network information table NIT, the BAT bouquet association table BAT or service information list SDT that demultiplexing also obtains business information SI, for the parsing of electronic program guide (EPG) information to the TS stream after reversion;
Substitute the TCP packetization module of UDP packetization module, described TCP packetization module connects described IP packetization module and wraps to receive described IP, and described IP bag is split, the data after segmentation are beaten for TCP bag is transmitted to be delivered on external network by external network interface.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6175628B1 (en) * | 1998-05-04 | 2001-01-16 | Motorola, Inc. | Method and system for broadcasting/distributing digital audio and video to a television |
| CN101588461A (en) * | 2008-05-20 | 2009-11-25 | 深圳市中兴集成电路设计有限责任公司 | Commercial display ternimal integrated with CMMB receiving module |
| CN101924860A (en) * | 2009-06-09 | 2010-12-22 | 青岛海尔软件有限公司 | Digital set top box based on AVS (Audio Video Standard) |
| CN101931735A (en) * | 2009-06-25 | 2010-12-29 | 青岛海尔软件有限公司 | Multifunctional digital set top box |
-
2013
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- 2013-05-15 CN CN201510650219.0A patent/CN105208432B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6175628B1 (en) * | 1998-05-04 | 2001-01-16 | Motorola, Inc. | Method and system for broadcasting/distributing digital audio and video to a television |
| CN101588461A (en) * | 2008-05-20 | 2009-11-25 | 深圳市中兴集成电路设计有限责任公司 | Commercial display ternimal integrated with CMMB receiving module |
| CN101924860A (en) * | 2009-06-09 | 2010-12-22 | 青岛海尔软件有限公司 | Digital set top box based on AVS (Audio Video Standard) |
| CN101931735A (en) * | 2009-06-25 | 2010-12-29 | 青岛海尔软件有限公司 | Multifunctional digital set top box |
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| CN105208432B (en) | 2016-09-28 |
| CN103281587A (en) | 2013-09-04 |
| CN103281587B (en) | 2015-12-23 |
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