CN103369382A - WIFI adapter and digital television signal distribution system using same - Google Patents
WIFI adapter and digital television signal distribution system using same Download PDFInfo
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Abstract
The invention discloses a WIFI adapter and a digital television signal distribution system using the same. The WIFI adapter comprises a cable digital television signal receiving module and a wireless router switching module. The cable digital television signal receiving module comprises a QAM signal receiving module (A), a network transmission component (B) and a main control and data processing unit (C). The wireless router switching module comprises an Ethernet switching processing chip, a plurality of Ethernet signal transformers, a plurality of LAN interfaces, a WAN interface, a WIFI processing chip and a wireless signal receiving and dispatching antenna, wherein the Ethernet signal transformers, the LAN interfaces, the WAN interface and the WIFI processing chip are sequentially connected with the Ethernet switching processing chip, and the wireless signal receiving and dispatching antenna is connected with the WIFI processing chip. By means of the WIFI adapter and the digital television signal distribution system using the same, cable digital television services are expanded to various handheld and portable mobile devices, and the WIFI adapter and the digital television signal distribution system using the same bring great convenience to use for household users.
Description
Technical field
The present invention relates to digital TV network and propagate, relate in particular to a kind of WIFI adapter and use this adapter
The digital television signal dissemination system.
Background technology
Along with the propelling that radio network of future generation (NGB) is built, Cable Digital TV Network will be finished broadband, Two-way transformation gradually.Under the prerequisite that traditional SD, high-definition live broadcasting digital television business still keep, possesses the main flow that the SD of interaction capabilities and the video request program of high definition (VOD) business will become digital television business.Live and order video program transmits to coaxial cable distribution net by the IPQAM modulator that is positioned at network edge.After a plurality of descending video program streams are combined as several multiplexing transport stream by the IPQAM modulator, transmit in the physical channel after some channel codings and QAM modulation.Terminal is generally the set-top box of supporting QAM to separate the mediation channel-decoding, and this set-top box demodulates signal from the frequency of appointment, then therefrom takes out the program stream of specified services ID and plays.This requires each set-top box must possess digital catv signal and receives the hardware relevant with channel-decoding.And current home-use many other equipment that possess video playback capability, such as desktop computer, notebook computer, panel computer and smart mobile phone etc. do not possess the QAM signal and receives and demodulation hardware.It is professional by the live and digital television interaction that coax network provides that this causes these equipment can't enjoy cable television operators.
Home terminal is enjoyed digital television business and is also had other approach, and that is exactly the Web TV take OTT as representative.Digital TV contents is given various digital-television terminal equipments in the family by cloud server by the Internet, backbone network and user access networks in such cases.In this case, the speed of user's video content that can receive will finally be subject to the restriction of family's access bandwidth.At present, except the countries and regions of basic communications facility especially prosperity, urban family the Internet access bandwidth generally is no more than 10Mbps; In such cases, if having 1-2 terminal equipment to watch simultaneously average bit rate by the Internet in the family is the digital TV in high resolution program of 4-5Mbps, the program that will occur causing because of the access bandwidth deficiency is play situation not smooth or that the Internet data service is had a strong impact on.
Summary of the invention
The objective of the invention is the defective that exists for above-mentioned prior art, propose a kind of WIFI adapter and make
Digital television signal dissemination system with this adapter.
The WIFI adapter that the present invention proposes comprises digital catv signal receiver module and wireless routing Switching Module, wherein,
Described digital catv signal receiver module comprises:
(A) QAM signal receiving module, the channel-decoding submodule that partly is made of rf input terminal, signal distribution circuit, multirouting down-conversion, QAM demodulation, error correction decoding consists of;
(B) Internet Transmission parts are made of Ethernet exchanging process chip, transformer, Ethernet physical interface terminal;
(C) master control and data processing unit, multiplexing submodule, code stream encapsulation submodule, network protocol stack submodule, management control protocol are processed submodule and are formed again by transmission flow demultiplexing submodule, code stream descrambling submodule, code stream;
Described wireless routing Switching Module comprises:
(A) Ethernet exchanging process chip;
(B) a plurality of ethernet signal transformers that are connected with the Ethernet exchanging process chip successively and many
Individual LAN(local area network (LAN)) interface and 1 WAN(wide area network) interface;
(C) WiFi process chip links to each other with the Ethernet exchanging process chip by a Media Independent Interface (MII);
(D) the wireless signal dual-mode antenna that is connected with described WiFi process chip;
Described digital catv signal receiver module is by netting twine, perhaps by differential lines to directly being connected with described Ethernet exchanging process chip, the WAN port of described wireless routing Switching Module is connected to the subscriber terminal equipment of Access Network.
The route switching chip of small-sized/family expenses office (SOHO) usefulness that described Ethernet exchanging process chip can adopt, this chip has some network ports to be connected to transformer and RJ45 Interface Terminal by Media Dependent Interface (MDI), one of them port is wide area network (WAN) interface, be connected to family's broadband access terminal device by this interface, other interfaces are the Local Area Network interface.
Described route switching built-in chip type or be connected with a CPU by the MII interface, this CPU is each WiFi work station main frame and the host assignment IP address that is connected to the wireless routing Switching Module, realizes simultaneously the control to the Ethernet exchanging process chip.
But described master control and data processing unit Adoption Network processor, digital signal processor (DSP) or high performance general processor.
Ethernet mac layer circuit Integral design in described master control and data processing unit and the described Internet Transmission parts.
Adopt the IEEE.802.11a/b/g/n standard to communicate between described master control and data processing unit and each WiFi Digital Television client, the message that communication protocol requires both sides to transmit is divided into device discovery, comprehensive management and control, live management and control, program request management and control, bit stream, and its concrete purposes, description transmission and recipient, bag type and substance are as shown in the table:
The present invention also proposes a kind of digital television signal dissemination system that uses above-mentioned WiFi adapter, comprises the coaxial cable that is connected with cable TV network; Be arranged on the WiFi adapter at coaxial cable access port place; With the wireless terminal that carries out wireless telecommunications with the WiFi adapter; Described WiFi adapter is comprised of digital catv signal receiver module and wireless routing Switching Module, wherein,
Described digital catv signal receiver module comprises:
(A) QAM signal receiving module, the channel-decoding submodule that partly is made of rf input terminal, signal distribution circuit, multirouting down-conversion, QAM demodulation, error correction decoding consists of;
(B) Internet Transmission parts are made of Ethernet exchanging process chip, transformer, Ethernet physical interface terminal;
(C) master control and data processing unit, multiplexing submodule, code stream encapsulation submodule, network protocol stack submodule, management control protocol are processed submodule and are formed again by transmission flow demultiplexing submodule, code stream descrambling submodule, code stream;
Described wireless routing Switching Module comprises:
(A) Ethernet exchanging process chip;
(B) a plurality of ethernet signal transformers that are connected with the Ethernet exchanging process chip successively and many
Individual LAN(local area network (LAN)) interface and 1 WAN(wide area network) interface;
(C) WiFi process chip links to each other with the Ethernet exchanging process chip by a Media Independent Interface (MII);
(D) the wireless signal dual-mode antenna that is connected with described WiFi process chip;
Described digital catv signal receiver module is by netting twine, perhaps by differential lines to directly being connected with described Ethernet exchanging process chip, the WAN port of described wireless routing Switching Module is connected to the subscriber terminal equipment of Access Network.
The present invention proposes a kind of mentality of designing that digital television signal is turned the WiFi adapter by coaxial cable.It will from coax network through the live or program request digital television code stream of QAM modulation by standards such as WiFi(IEEE.802.11a/b/g/n) channel distributes to the family digital television terminal equipment.This adapter can be an independently equipment, also can be a functional module of family expenses WiFi router or Digital Television intelligent terminal.It can be from the qam signal of coax network reception and a plurality of frequencies of demodulation, therefrom parse several digital television program code streams, and transmit to digital-television terminal equipment each family expenses, that possess the WiFi work station module (smart mobile phone, panel computer, notebook computer etc. are hereinafter referred to as the WiFi digital TV terminal) by the upper strata host-host protocol based on WiFi.
Application of the present invention will be so that coaxial cable have the electronic equipment of coaxial cable physical interface to extend by WiFi to other originally.Install after this device, within the scope that family's WiFi signal covers, other WiFi digital TV terminals, can receive digital catv signal as " relaying " by WiFi, can transplant easily so softwares such as originally only having Digital Television that wired digital set-top box just possesses and video on demand, thereby enjoy the live and program request digital television business that cable television operators provide.
Compare with internet television, the digital TV contents that is provided by cable television operators has arrived subscriber household by coax network, therefore will not be subjected to the restriction of home interconnect net outlet bandwidth by the present invention by the signal rate that WiFi passes on out, and only be subjected to the restriction of local WiFi band width in physical; And currently can reach 54Mbps or 320Mbps based on the data communication rates between the WiFi equipment of IEEE.802.11/g/n standard, can satisfy simultaneously the requirements for the many covers of a plurality of WiFi digital TV terminals transmission digital TV in high resolution programs fully.
Along with application of the present invention, the potential digital terminal user's of cable digital TV operator quantity will increase greatly because of the adding of various hand-held, portable sets; Simultaneously, the various domestic consumer electronic equipments that possess WiFi work station, display screen and audio frequency processing hardware, with the various abundant digital television application that are increased, particularly the high definition interactive VOD is used, and the user of these application experiences the level that can reach basically identical with using the cable digital TV Intelligent set top box.
Description of drawings
Fig. 1 is system's pie graph of the WiFi adapter that proposes of the present invention;
Fig. 2 is the digital television signal dissemination system schematic diagram that uses WiFi adapter shown in Figure 1.
Embodiment
Below in conjunction with drawings and Examples invention is described in detail.
As shown in Figure 1, the WiFi adapter of the present invention's proposition is made of digital catv signal receiver module and wireless routing Switching Module two large divisions.
The digital catv signal receiver module comprises: (A) QAM signal receiving module by rf input terminal and signal distribution circuit, adds that the channel-decoding submodule that multirouting down-conversion, QAM demodulation, error correction decoding etc. partly consist of consists of; (B) Internet Transmission parts, by ethernet mac layer circuit, ethernet physical layer circuit, transformer, Ethernet physical interface terminal consist of; (C) master control and data processing unit, multiplexing submodule, code stream encapsulation submodule, network protocol stack submodule, management control protocol are processed submodule and are formed again by transmission flow demultiplexing submodule, code stream descrambling submodule (optional), code stream.If selected master control and data processing unit (can be network processing unit, DSP or high performance general processor) comprise ethernet mac layer circuit, then need not external MAC circuit.
The wireless routing Switching Module comprises: (A) Ethernet exchanging process chip (exchange of MAC/ physical layer), this chip generally comprises a plurality of LAN(local area network (LAN)s) interface and 1 WAN(wide area network) interface; (B) a plurality of ethernet signal transformers and physical interface; (C) WiFi process chip (MAC/ base band/radio frequency processing chip) can adopt the IEEE.802.11a/b/g/n standard; (d) part such as wireless signal dual-mode antenna.The WiFi process chip can adopt IEEE802.3 100BASE-T by Media Dependent Interface MII(reality) link to each other with Ethernet switching chip.
The digital catv signal receiver module also can be by differential lines to being directly connected to certain LAN port of wireless routing Switching Module with surpassing 5 classes or 6 class netting twines are received the wireless routing Switching Module by the RJ45 connecting terminals; Rear a kind of connected mode can be saved transmission transformer.
The WAN port of wireless routing Switching Module is connected to the subscriber terminal equipment of Access Network, such as ADSL user side, cable modem, Optical Network Terminal (ONT) etc.
WIFI adapter operation principle is as follows:
A. digital catv signal receiver module
The digital catv signal receiver module is finished following function: to one the tunnel or multichannel receive from the qam signal of coaxial cable; Demultiplexing/descrambling (optional)/again of finishing digital television code stream is multiplexing; Needed digital television code stream is carried out IP encapsulation and transmit to the WiFi digital TV terminal; Management control protocol between realization and each WiFi digital TV terminal.
The QAM signal receiving module is finished the reception of qam signal under the control of master control and data processing unit.This module is at first carried out down-conversion to signal, and the radiofrequency signal that namely by mixing and filtering carrier frequency is in 105MHz～862MHz is down-converted to the intermediate frequency about 36MHz; The local frequency of down conversion module is by master control and data processing unit setting.Intermediate-freuqncy signal through AD conversion, carrier wave recovery, symbol clock recovery, QAM demodulation, deinterleave, the RS error correction decoding, to go randomization and mpeg frame to be shaped to process to be reduced to mpeg 2 transport stream be that (each frame length is 188 bytes to the TS frame, be PID sign with the frame identifier), give master control and data processing unit is processed by HSSI High-Speed Serial Interface.Because the digital television signal of the different required receptions of digital TV terminal may be in different carrier frequency, so the QAM signal receiving module needs signal distribution circuit and a plurality of channel-decoding submodule.
Master control and data processing unit by transmission flow demultiplexing submodule, code stream descrambling submodule (optional), code stream more multiplexing submodule, code stream encapsulation submodule, network protocol stack submodule, management control protocol process submodule and form, finish the functions such as transmission flow demultiplexing/descrambling (optional)/again is multiplexing, code stream encapsulation, network protocol stack, management and control protocol processes.Transmission flow demultiplexing partly is responsible for the multichannel mpeg 2 transport stream data that the receiving demodulation module transmits, and therefrom parses one or more digital television program code stream.Code stream descrambling part is reduced to transparent program stream with the program stream of scrambling, as adopting, its Descrambling Algorithms should be corresponding (because code stream scrambling algorithm generally adopts the DVB-CSA algorithm to carry out to the algorithm of code stream scrambling with digital television front-end system, cause descrambling process more complicated, therefore in this device, finish the descrambling of program stream, can reduce the complexity of WiFi digital TV terminal and save its power consumption).Code stream more multiplexing submodule to the PID(of program stream bag identifier) replace, perhaps parse required program-related information (the EPG information that under live application, needs).The code stream package module is encapsulated into the IP bag with the transport stream of transmission flow demultiplexing/again Multiplexing module generation, namely take per 1～7 TS bag as unit, is encapsulated as UDP datagram, then passes to the network protocol stack submodule and transmits.The network protocol stack submodule is finished the required processing of ICP/IP protocol, and it realizes the mac frame transmitting-receiving by MII interface and media interviews controls (MAC) layer circuit communication; The latter can be master control and the built-in circuit of data processing unit, also can be outside chip.Management and control protocol processes submodule is realized the management control communication protocol with each WiFi digital TV terminal, this submodule can be to separating the mediation channel-decoding as a result according to protocol processes, transmission flow demultiplexing/multiplexing again, running parameter (the frequency that for example needs the QAM signal of demodulation of the submodules such as code stream encapsulation, modulation system, symbol rate, the ID of the program that the Multiplexing module of transmission flow demultiplexing/again need to receive, the source of the datagram that the code stream package module produces, purpose IP address and port numbers etc.) control, perhaps send the rendition list to the WiFi digital TV terminal, the service related informations such as electronic program guides (SI).The transfer of data of master control and data processing unit and protocol processes adopt same IP address, and this address is generally distributed by the DHCP agreement by the master cpu of wireless routing Switching Module; This address also is the sole purpose IP address that each WiFi digital TV terminal is communicated by letter with this adapter; The WiFi digital TV terminal obtains this address by device discovery protocol.
B. wireless routing Switching Module
The wireless routing Switching Module is realized the routing and swiching of various packets between digital catv signal receiver module, each WiFi digital TV terminal and Internet.This module is by Ethernet exchanging process chip (MAC/ PHY switched circuit), master cpu, WiFi process chip (MAC/ base band/rf processing circuitry) and the formations such as some transformers, network physical interface.
The route switching chip of small-sized/family expenses office (SOHO) usefulness that the Ethernet exchanging process chip generally can be selected, this chip has some network ports to be connected to transformer and RJ45 Interface Terminal by Media Dependent Interface (MDI).One of them port is wide area network (WAN) interface, is connected to family's broadband access terminal device (ADSL user side, optical network unit ONU, cable modem etc.) by this interface, and other interfaces are the Local Area Network interface.The route switching chip also is connected to WiFi process chip (MAC/ base band/rf processing circuitry) by a Media Independent Interface (MII); The Ethernet exchanging process chip is also answered built-in or is connected to a CPU by the MII interface, this CPU will realize the DHCP(DHCP) server capability, for each WiFi work station main frame and the host assignment IP address that is connected to the wireless routing Switching Module, realize simultaneously the control to the route exchange chip.The WiFi process chip also can be selected special chip, it finishes IEEE802.11 WLAN agreement, ethernet mac, 2.4G/5.8G radio frequency processing, power amplification (signal transmission) and noiselike signal amplify functions such as (receptions), external telescopic antenna settling signal transmitting-receiving.
C. communication protocol
In order to realize live and program request digital television application demand, need to realize a cover communication protocol between the master control of digital catv signal receiver module and data processing unit and each WiFi Digital Television client, this protocol requirement both sides transmit a series of message.These message are divided into the classes such as device discovery, comprehensive management and control, live management and control, program request management and control, bit stream.Its concrete purposes, description transmission and recipient, bag type and substance are as shown in the table:
The type of various message all is self-defining and must not repeats.TS over UDP is adopted in the program stream transmission, and its port numbers that adopts is arranged by " program stream transmission start " message by the Digital Television client.Under the prerequisite that satisfies the main message content of transmission, the packet of actual transmissions should comprise the parts such as stem, actual valid data and verification.
The present invention will flow from program request and live digital television program coax network, that transmitted by cable digital TV operator, receive and be converted to the IP packet, pass to the rear class equipment that does not possess the cable TV input interface by WiFi or network cable, make these equipment can enjoy digital television service.For live Digital Television, this device can also and provide programme information for the search of rear class equipment; For order program service, this device also for rear class equipment finish the program request client the descending QAM Channel Detection task that must carry out.
Fig. 2 is the schematic diagram that uses the digital television signal dissemination system of WiFi adapter.
What be positioned at WiFi adapter front end is the live digital television front-end system of VOD/, content distributing network, the Access Network of cable TV network operator, and wherein live and program request digital TV contents is connected to subscriber household by the IPQAM modulator that is positioned at network edge (mainly being the optical node place) by the coaxial cable distribution net network.The WiFi adapter is installed on the coaxial cable access port place of subscriber household.The coaxial cable of cable TV network is connected to the RF input of WiFi adapter; The internet access terminal equipment of family (ADSL, ONT etc.) is connected to the wan interface of WiFi adapter by ethernet line; Each WiFi digital TV terminal (notebook computer, panel computer, smart mobile phone etc.) is connected to the WiFi adapter by the WiFi wireless channel, also may there be in addition PC or other electronic equipments to be connected to the WiFi adapter by Ethernet cable in the subscriber household, these equipment can receive the digital television code stream that the WiFi adapter sends, and realize and the connected sum of the Internet and the interaction of front end VOD system by the WiFi adapter.Need to install live or the program request digital television application software on each WiFi digital TV terminal, and and the data communication protocol between the WiFi adapter generally exist as the bottom module of this software.
Because WiFi adapter within the family section has served as the role of the qam demodulator that one or more Digital Television client that does not possess QAM demodulation hardware itself shared, so it need to possess all functions that should possess as QAM demodulation hardware in the Digital Television client device.
In order to save power consumption, after adapter is installed, in the situation that do not connect with any WiFi digital TV terminal, will close its demodulation module to save power consumption.
Digital Television client and adapter are set up initial contacting by device discovery and response message.
With WiFi Digital Television client set up contact after, the WiFi adapter at first wants the management and control agreement to obtain the live of current network and program request QAM frequency configuration.Wherein the most important thing is the dominant frequency point in the live frequency configuration information, this frequency has comprised and has carried out the necessary network information table of web search (NIT); The program request frequency configuration mainly is the tabulation of the descending QAM passage of one's respective area program request, and the position in the descending QAM passage that is marked at that is used for identifying stream district (ID of each program request downlink transfer stream must not repeat in the same flow district).
The digital television application program that runs on digital TV terminal may be program request (VOD) or live (Live TV).
One, program request is used
After the program request client application (hereinafter to be referred as client) of WiFi digital TV terminal starts, can send a program request client terminal start-up message to the WiFi adapter.After receiving this message, the WiFi adapter namely carries out the scanning of the descending QAM passage of program request according to the indication of the program request QAM frequency configuration information of prior acquisition.Owing to having a plurality of demodulator circuits, the WiFi adapter can be with all QAM passages of one of them demodulation module periodic scanning.Scanning result is by " report of QAM scanning result " message informing client.Scanning result may be: (A) available QAM: find the QAM passage that one or more is available, that is these passages can lock and therefrom parse mark, what provide in the information such as the indicated stream district of mark, TSID and the configuration file is consistent; (B) QAM that loses: the frequency at certain QAM place can't lock, although perhaps locked signal, can't parse TSID or stream district information; (C) QAM of mistake: although the frequency at certain QAM place can lock, also can parse TSID and stream district information, the stream realm name that parses claims or TSID and the configuration information that obtains in advance do not mate.
After receiving the QAM scanning result message that the WiFi adapter sends, client can be positioned at the particular server assembly (being generally automatic discovery server) of network edge in the VOD system and report this result; In the packet of this report, the ID(that can add this client is generally MAC Address).VOD leading portion system determining the descending QAM of the visible program request of this program request client and affiliated edge QAM modulator thereof, and is suitable descending QAM of its distribution and program ID according to these scanning results after this program request client is initiated order request.
The program request client is initiated order request to the program request reply management server of VOD system.Namely can comprise in this request one by the WiFi adapter provide, for the tabulation of the descending QAM resource of this program request client program request visible, that be in upstate.Session establishment phase, front end system are that the request program flow point of client prepares descending QAM resource (QAM title, frequency, traffic ID etc.), and with these Information encapsulations in the response packet of issuing client.
Receive that client namely can be sent the bit stream initiation message to the WiFi adapter after the replying of on-demand session, comprised the information such as the employed udp port of frequency, modulation system, program number, bit stream number at the program place of needs transmission in this message.The WiFi adapter receives after this request, namely can: (A) control the demodulation module that certain is in idle condition, carry out the signal demodulation according to the frequency of asking and modulation system etc.; (B) control transmission flow demultiplexing/again Multiplexing module starts the reception of the elementary streams such as sound to this program, video; Demultiplexing module is analyzed the PMT of program according to indicated program number, therefrom parses the elementary streams such as audio frequency, video and PCR of program.If code stream descrambling function not enabled and program stream is scrambling then also needs to resolve the PID of the relevant ECM of program encryption mandate and EMM stream.The reception of all elementary streams that startup is relevant to program (comprising the ECM/EMM stream that may need), and in reception buffer zone replaces with known fixed value with the PID field of these streams; (C) control stream package module, per 7 the continuous transport stream frames of program elementary streams packet (length is 188 bytes) are encapsulated as the UDP message bag, then sending to network protocol stack transmits, transmission destination slogan is specified port numbers, and purpose IP address is the IP address of program request client.In said process, if there is any one link to go wrong (for example demodulation module can't locking signal, and demultiplexing module can't be filled into data etc.), the WiFi adapter all should send the wrong message of reporting to the program request client.
The program request client is received bit stream data, begins deciphering, decoding broadcast.In the playing process, the program request client may be suspended program, F.F., rewind down, the control operation such as broadcast when selecting, these operating process by the broadband access passage directly and the stream pushing server of VOD system carry out alternately.
After program finished or the user stops program, client was sent the request that stops current sessions to the session management server of VOD on the one hand, sends the message that stops the program transfer of data to the WiFi adapter simultaneously.The WiFi adapter receives after this request, can stop namely that the demodulation, demultiplexing of program data/again are multiplexing, code stream encapsulation etc., and discharges relevant resource (demodulator, the required filter of demultiplexing, buffering area etc.).
In said process, client is set up the electronic program guides (EPG) that communication link obtains request program by the navigation server of Access Network and VOD system.The digital catv signal receiver module of this process and WiFi adapter is irrelevant.
Two, live application
After the live client application of digital TV terminal starts, can send a live client terminal start-up message to this device.
In case receive that after the message of certain live client terminal start-up, the WiFi adapter can be carried out following operation:
(A) check whether searched for live digital television program (whether having preserved live digital TV channel tabulation), if do not have, then start the programme televised live search; (B) if preserved live digital TV channel tabulation, check then whether channel has renewal (whether the version number that the version number of the NIT table by comparing live Digital Television dominant frequency point has preserved relatively changes to judge), if renewal is arranged then channel searching again.The information that comprises in the channel list includes but not limited to the frequency at channel designation, channel type, program ID, channel place etc.
Live client can be sent to this device the message of request channel list subsequently.Receive after this message, the management control protocol of the CPU of WiFi adapter is processed submodule can send to live client with the live digital TV channel tabulation of this locality preservation.Live client channel list, and be shown to the user.After certain channel of user selection, may ask to watch this channel, also might ask the electronic program guide information of this channel.
When certain direct broadcast band is watched in user request, client namely can be sent to the WiFi adapter request of transmission direct broadcast band bit stream data, has comprised the information such as the employed udp port of program number, bit stream number of the channel that needs transmit in this request data package.The WiFi adapter is identical with the processing that request program stream is asked to the processing of programme televised live bit stream request.
Different from request program, the electronic program guides of direct broadcast band (EPG) information just is included in the downlink radio frequency channel of QAM modulation.Therefore, when live client will receive the EPG of certain channel, need to send and receive to the WiFi adapter request of the EPG information of this channel.This request has comprised the program number that will receive the channel of EPG information.The management control protocol of the CPU of WiFi adapter is processed submodule and is received after this request, namely can: the QAM that (A) controls certain this channel place of demodulation module demodulation that is in idle condition modulates frequency; (B) Multiplexing module of transmission flow demultiplexing/again of indication CPU, startup is to reception and the parsing of the EPG information of this channel, be specially: receive the Event Information Table (EIT) in the transport stream of this channel place frequency, and go out the EIT sublist of this channel take the program number of this channel as the coupling keyword filtration; Parse the programme distant information of this channel, and it is saved as an interim event (have time started, duration and title in this channel, and certain program that may comprise the program introduction being called " event ") tabulation; (C) as replying that EPG is asked, send this list of thing to live client.This list of thing of live client also is shown to the user.
After the user withdrawed from live client application, client sent the instruction that stops the program transfer of data to the WiFi adapter.The management control protocol of the CPU of WiFi adapter is processed submodule and is received after this request, can stop namely that the demodulation, demultiplexing of program data/again are multiplexing, code stream encapsulation etc., and discharge relevant resource (demodulator, the required filter of demultiplexing, buffering area etc.).
If a plurality of Digital Television client applications are arranged simultaneously in operation, then the WiFi adapter may send Digital Television (program request or live) bit stream data to a plurality of clients simultaneously.These programs may be in the same transport stream, also may be dispersed in a plurality of transport stream.Because each transport stream will take a QAM modulation channels, therefore, what Digital Television clients the WiFi adapter need to support simultaneously, and its digital catv signal receiver module just needs what demodulation modules of configuration.After all clients had all been closed its digital television application program, the WiFi adapter was with its demodulation module hardware of autoshutdown, to save power consumption.
The WiFi adapter that the present invention proposes also can be installed in the set-top box, as parts of set-top box.
Above-described embodiment only is used for explanation the specific embodiment of the present invention.Should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and variation, these distortion and variation all should belong to protection scope of the present invention.
Claims (9)
1. a WiFi adapter is characterized in that described adapter comprises digital catv signal receiver module and wireless routing Switching Module, wherein,
Described digital catv signal receiver module comprises:
(A) QAM signal receiving module comprises the channel-decoding submodule that rf input terminal, signal distribution circuit, multirouting down-conversion, QAM demodulation, error correction decoding partly consist of;
(B) Internet Transmission parts are made of Ethernet exchanging process chip, transformer, Ethernet physical interface terminal;
(C) master control and data processing unit, multiplexing submodule, code stream encapsulation submodule, network protocol stack submodule, management control protocol are processed submodule and are formed again by transmission flow demultiplexing submodule, code stream;
Described wireless routing Switching Module comprises:
(A) Ethernet exchanging process chip;
(B) a plurality of ethernet signal transformers that are connected with the Ethernet exchanging process chip successively and a plurality of LAN(local area network (LAN)) interface and 1 WAN(wide area network) interface;
(C) WiFi process chip links to each other with the Ethernet exchanging process chip by a Media Independent Interface (MII);
(D) the wireless signal dual-mode antenna that is connected with described WiFi process chip;
Described digital catv signal receiver module is by netting twine, perhaps by differential lines to directly being connected with described Ethernet exchanging process chip, the WAN port of described wireless routing Switching Module is connected to the subscriber terminal equipment of Access Network.
2. WiFi adapter as claimed in claim 1, it is characterized in that: described master control and data processing unit also comprise code stream descrambling submodule.
3. WiFi adapter as claimed in claim 1, it is characterized in that: described Ethernet exchanging process chip adopts the route switching chip of small-sized/family expenses office (SOHO) usefulness, this chip has some network ports to be connected to transformer and RJ45 Interface Terminal by Media Dependent Interface (MDI), one of them port is wide area network (WAN) interface, be connected to family's broadband access terminal device by this interface, other interfaces are the Local Area Network interface.
4. WiFi adapter as claimed in claim 3, it is characterized in that: described route switching built-in chip type or be connected with a CPU by the MII interface, this CPU is each WiFi work station main frame and the host assignment IP address that is connected to the wireless routing Switching Module, realizes simultaneously the control to the route exchange chip.
5. WiFi adapter as claimed in claim 1, it is characterized in that: described code stream encapsulation submodule is encapsulated into the IP bag with the transport stream of transmission flow demultiplexing/again Multiplexing module generation, and take per 1～7 TS bag as unit, be encapsulated as UDP datagram, then pass to the network protocol stack submodule and transmit.
6. WiFi adapter as claimed in claim 1 is characterized in that: described master control and data processing unit Adoption Network processor, DSP or high performance general processor.
7. adapter as claimed in claim 6 is characterized in that: the ethernet mac layer circuit Integral design in described master control and data processing unit and the described Internet Transmission parts.
8. WiFi adapter as claimed in claim 1, it is characterized in that: adopt the IEEE.802.11a/b/g/n standard to communicate between described master control and data processing unit and each WiFi Digital Television client, the message that communication protocol requires both sides to transmit is divided into device discovery, comprehensive management and control, live management and control, program request management and control, bit stream, and its concrete purposes, description transmission and recipient, bag type and substance are as shown in the table:
9. a right to use requires the digital television signal dissemination system of 1 described WiFi adapter, comprises the coaxial cable that is connected with cable TV network; Be arranged on the WiFi adapter at coaxial cable access port place; With the wireless terminal that carries out wireless telecommunications with the WiFi adapter; It is characterized in that, described WiFi adapter is comprised of digital catv signal receiver module and wireless routing Switching Module, wherein,
Described digital catv signal receiver module comprises:
(A) QAM signal receiving module comprises the channel-decoding submodule that rf input terminal, signal distribution circuit, multirouting down-conversion, QAM demodulation, error correction decoding partly consist of;
(B) Internet Transmission parts are made of Ethernet exchanging process chip, transformer, Ethernet physical interface terminal;
(C) master control and data processing unit, multiplexing submodule, code stream encapsulation submodule, network protocol stack submodule, management control protocol are processed submodule and are formed again by transmission flow demultiplexing submodule, code stream;
Described wireless routing Switching Module comprises:
(A) Ethernet exchanging process chip;
(B) a plurality of ethernet signal transformers that are connected with the Ethernet exchanging process chip successively and a plurality of LAN(local area network (LAN)) interface and 1 WAN(wide area network) interface;
(C) WiFi process chip links to each other with the Ethernet exchanging process chip by a Media Independent Interface (MII);
(D) the wireless signal dual-mode antenna that is connected with described WiFi process chip;
Described digital catv signal receiver module is by netting twine, perhaps by differential lines to directly being connected with described Ethernet exchanging process chip, the WAN port of described wireless routing Switching Module is connected to the subscriber terminal equipment of Access Network.
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