CN203457263U - WIFI adapter and digital television signal distribution system using WIFI adapter - Google Patents
WIFI adapter and digital television signal distribution system using WIFI adapter Download PDFInfo
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- CN203457263U CN203457263U CN201320421670.1U CN201320421670U CN203457263U CN 203457263 U CN203457263 U CN 203457263U CN 201320421670 U CN201320421670 U CN 201320421670U CN 203457263 U CN203457263 U CN 203457263U
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Abstract
The utility model discloses a WIFI adapter and a digital television signal distribution system using the WIFI adapter. The WIFI adapter comprises a wired digital television signal receiving module and a wireless routing exchange module. The wired digital television signal receiving module comprises: (A) a QAM signal receiving module, (B) a network transmission component and (C) a master control and data processing unit. The wireless routing exchange module comprises: an Ethernet exchange processing chip, and multiple Ethernet signal transformers, multiple LAN (local area network) interfaces and one WAN (wide area network) interface which are connected with the Ethernet exchange processing chip in turn, a WiFi processing chip and a wireless signal transmit-receive antenna which is connected with the WiFi processing chip. A wired digital television business is expanded to various hand-held and portable mobile devices so that application for household users is greatly facilitated.
Description
Technical field
The utility model relates to digital TV network to be propagated, and relates in particular to a kind of WIFI adapter and uses this suitable
The digital television signal dissemination system of orchestration.
Background technology
Along with the propelling that radio network of future generation (NGB) is built, Cable Digital TV Network will complete broadband, Two-way transformation gradually.Still, under the prerequisite retaining at traditional SD, high-definition live broadcasting digital television business, possesses the SD of interaction capabilities and the video request program of high definition (VOD) business will become the main flow of digital television business.Live and order video program transmits to coaxial cable distribution net by being positioned at the IPQAM modulator of network edge.A plurality of descending video program streams are combined as after several multiplexing transport stream by IPQAM modulator, in the physical channel after some channel codings and QAM modulation, transmit.Terminal is generally the Set Top Box of supporting QAM to separate 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 much other the equipment that possesses video playback capability, such as desktop computer, notebook computer, panel computer and smart mobile phone etc., does not possess QAM signal and receives and demodulates hardware.This causes these equipment cannot enjoy the live and digital television interaction business that cable television operators provide by coax network.
Home terminal is enjoyed digital television business and is also had other approach, and that is exactly to take the Web TV that OTT is representative.Digital TV contents is given the various digital-television terminal equipments in family by cloud server by the Internet, backbone network and user access networks in such cases.The speed of the video content that in this case, user 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 is generally no more than 10Mbps; In such cases, if having 1-2 terminal equipment to watch average bit rate by the Internet in family is the digital TV in high resolution program of 4-5Mbps simultaneously, just there will be the program causing because of access bandwidth deficiency to play situation not smooth or that Internet data service is had a strong impact on.
Utility model content
The purpose of this utility model is the defect existing for above-mentioned prior art, proposes a kind of WIFI adapter
And use the digital television signal dissemination system of this adapter.
The WIFI adapter the utility model 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 partly consisting of rf input terminal, signal distribution circuit, multirouting down-conversion, QAM demodulation, error correction decoding forms;
(B) Internet Transmission parts, consist of Ethernet exchanging process chip, transformer, Ethernet physical interface terminal;
(C) master control and data processing unit, by transmission flow demultiplexing submodule, code stream descrambling submodule, code stream, multiplexing submodule, code stream encapsulation submodule, network protocol stack submodule, management control protocol are processed submodule and are formed again;
Described wireless routing Switching Module comprises:
(A) Ethernet exchanging process chip;
(B) a plurality of ethernet signal transformers that are connected with 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, is connected with Ethernet exchanging process chip by a Media Independent Interface (MII);
(D) the wireless signal dual-mode antenna being connected with described WiFi process chip;
Described digital catv signal receiver module is by netting twine, or by differential lines to being directly 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) use 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, by this interface, be connected to family's broadband access terminal device, other interfaces are Local Area Network interface.
Described route switching built-in chip type or be connected with a CPU by MII interface, this CPU is each WiFi work station main frame and the host assignment IP address that is connected to wireless routing Switching Module, realizes the control to Ethernet exchanging process chip simultaneously.
Described master control and data processing unit can Adoption Network processors, digital signal processor (DSP) or high performance general processor.
Ethernet mac layer circuit Integral design in described master control and data processing unit and described Internet Transmission parts.
The utility model also proposes a kind of digital television signal dissemination system that uses above-mentioned WiFi adapter, comprises the coaxial cable being 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 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 partly consisting of rf input terminal, signal distribution circuit, multirouting down-conversion, QAM demodulation, error correction decoding forms;
(B) Internet Transmission parts, consist of Ethernet exchanging process chip, transformer, Ethernet physical interface terminal;
(C) master control and data processing unit, by transmission flow demultiplexing submodule, code stream descrambling submodule, code stream, multiplexing submodule, code stream encapsulation submodule, network protocol stack submodule, management control protocol are processed submodule and are formed again;
Described wireless routing Switching Module comprises:
(A) Ethernet exchanging process chip;
(B) a plurality of ethernet signal transformers that are connected with 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, is connected with Ethernet exchanging process chip by a Media Independent Interface (MII);
(D) the wireless signal dual-mode antenna being connected with described WiFi process chip;
Described digital catv signal receiver module is by netting twine, or by differential lines to being directly 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 utility model proposes a kind of mentality of designing of WiFi adapter that digital television signal is turned by coaxial cable.It by the live or program request digital television code stream through QAM modulation from coax network by standards such as WiFi(IEEE.802.11a/b/g/n) channel distributes to family digital television terminal equipment.This adapter can be an independently equipment, can be also a functional module of family expenses WiFi router or Digital Television intelligent terminal.It can receive and demodulate from coax network the qam signal of a plurality of frequencies, therefrom parse several digital television program code streams, and forward to digital-television terminal equipments each family expenses, that possess WiFi work station module (smart mobile phone, panel computer, notebook computer etc., hereinafter referred to as WiFi digital TV terminal) by the upper strata host-host protocol based on WiFi.
Application of the present utility model will make coaxial cable to other, originally not have the electronic equipment of coaxial cable physical interface to extend by WiFi.After this device is installed, within the scope covering at family's WiFi signal, other WiFi digital TV terminals, can as " relaying ", receive digital catv signal 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 being provided by cable television operators has arrived subscriber household by coax network, the signal rate of therefore being passed on out by WiFi by the present invention will not be subject to the restriction of home interconnect net outlet bandwidth, and is only subject to the restriction of local WiFi band width in physical; And data communication rates between the current WiFi equipment based on IEEE.802.11/g/n standard can reach 54Mbps or 320Mbps, can meet simultaneously the requirements for the many covers of a plurality of WiFi digital TV terminals transmission digital TV in high resolution programs completely.
Along with application of the present utility model, the potential digital terminal user's of cable digital TV operator quantity will increase greatly because of various hand-held, adding of portable set; Simultaneously, the various domestic consumer electronic equipments that possess WiFi work station, display screen and audio frequency processing hardware, by the various abundant digital television application that are increased, particularly high definition interactive VOD application, and the user of these application experiences the level that can reach basically identical with using cable digital TV Intelligent set top box.
Accompanying drawing explanation
Fig. 1 is the system pie graph of the WiFi adapter that the utility model proposes;
Fig. 2 is the digital television signal dissemination system schematic diagram that uses WiFi adapter shown in Fig. 1.
Embodiment
Below in conjunction with drawings and Examples, utility model is described in detail.
As shown in Figure 1, the WiFi adapter the utility model proposes consists of digital catv signal receiver module and wireless routing Switching Module two large divisions.
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 form forms; (B) Internet Transmission parts, by ethernet mac layer circuit, ethernet physical layer circuit, transformer, Ethernet physical interface terminal form; (C) master control and data processing unit, by transmission flow demultiplexing submodule, code stream descrambling submodule (optional), code stream, multiplexing submodule, code stream encapsulation submodule, network protocol stack submodule, management control protocol are processed submodule and are formed again.If selected master control and data processing unit (can be network processing unit, DSP or high performance general processor) comprise ethernet mac layer circuit, without external MAC circuit.
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 IEEE.802.11a/b/g/n standard; (d) part such as wireless signal dual-mode antenna.WiFi process chip can adopt IEEE802.3 100BASE-T by Media Dependent Interface MII(reality) be connected with Ethernet switching chip.
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 wireless routing Switching Module by 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
Digital catv signal receiver module completes following function: Dui Yi road or multichannel receive from the qam signal of coaxial cable; Complete the demultiplexing/descrambling (optional) of digital television code stream/multiplexing again; Needed digital television code stream is carried out to IP encapsulation and transmit to WiFi digital TV terminal; Management control protocol between realization and each WiFi digital TV terminal.
QAM signal receiving module completes the reception of qam signal under the control of master control and data processing unit.First this module carries out down-conversion to signal, and by mixing and filtering, by carrier frequency, the radiofrequency signal in 105MHz～862MHz is down-converted to the intermediate frequency of 36MHz left and right; The local frequency of down conversion module is arranged by master control and data processing unit.Intermediate-freuqncy signal through AD conversion, carrier wave recovery, symbol clock recovery, QAM demodulation, deinterleave, RS error correction decoding, to be reduced to mpeg 2 transport stream be that (each frame length is 188 bytes to TS frame in processing to go randomization and mpeg frame to be shaped, with frame identifier, be PID sign), by HSSI High-Speed Serial Interface, give master control and data processing unit is processed.Because the digital television signal of the different required receptions of digital TV terminal may be in different carrier frequency, so 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, complete the functions such as transmission flow demultiplexing/descrambling (optional)/is again multiplexing, code stream encapsulation, network protocol stack, management and control protocol processes.Transmission flow demultiplexing is partly responsible for the multichannel mpeg 2 transport stream data that 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 by the program stream of scrambling, as adopted, its Descrambling Algorithms should (be carried out because code stream scrambling algorithm generally adopts DVB-CSA algorithm the algorithm of code stream scrambling is corresponding with digital television front-end system, cause descrambling process more complicated, therefore in this device, complete the descrambling of program stream, can reduce the complexity of WiFi digital TV terminal and save its power consumption).Code stream is the PID(bag identifier of multiplexing submodule to program stream again) replace, or parse required program-related information (the EPG information needing) under live application.Code stream package module is encapsulated into IP bag by the transport stream that transmission flow demultiplexing/Multiplexing module produces again,, with every 1～7 GeTSBao Wei unit, is encapsulated as UDP datagram, then passes to network protocol stack submodule and transmits.Network protocol stack submodule completes the required processing of ICP/IP protocol, and it is controlled (MAC) layer circuit communication by MII interface and media interviews and realizes mac frame transmitting-receiving; The latter can be master control and the built-in circuit of data processing unit, can be also outside chip.Management and control protocol processes submodule is realized with the management of each WiFi digital TV terminal and is controlled communication protocol, can be to separating mediation channel-decoding according to this submodule of protocol processes result, 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 transmission flow demultiplexing/program that Multiplexing module need to receive again, the source of the datagram that code stream package module produces, object IP address and port numbers etc.) control, or send the rendition list to 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 ，Gai address, same IP address generally by the master cpu of wireless routing Switching Module, by DHCP agreement, to be distributed; This address is also the sole purpose IP address that each WiFi digital TV terminal is communicated by letter with this adapter; WiFi digital TV terminal obtains this address by device discovery protocol.
B. wireless routing Switching Module
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, the formations such as WiFi process chip (MAC/ base band/rf processing circuitry) and some transformers, network physical interface.
The route switching chip of small-sized/family expenses office (SOHO) use that 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, by this interface, is connected to family's broadband access terminal device (ADSL user side, optical network unit ONU, cable modem etc.), and other interfaces are Local Area Network interface.Route switching chip is also connected to WiFi process chip (MAC/ base band/rf processing circuitry) by a Media Independent Interface (MII); Ethernet exchanging process chip is also answered built-in or is connected to a CPU by MII interface, this CPU will realize DHCP(DHCP) server capability, for being connected to each WiFi work station main frame and the host assignment IP address of wireless routing Switching Module, realize the control to route exchange chip simultaneously.WiFi process chip also can be selected special chip, it completes 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, between the master control of digital catv signal receiver module and data processing unit and each WiFi Digital Television client, need to realize a set of communication protocol, 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 is all self-defining and must not repeats.Program stream transmission adopts TS over UDP, and its port numbers adopting is arranged by " program stream transmission start " message by Digital Television client.Meeting under the prerequisite of the main message content of transmission, the packet of actual transmissions should comprise the parts such as stem, actual valid data and verification.
The utility model is by the program request of the ,You cable digital TV operator transmission from coax network and live digital television program stream, receive and be converted to IP packet, by WiFi or network cable, pass to the rear class equipment that does not possess cable TV input interface, make these equipment can enjoy digital television service.For live Digital Television, programme information be searched for and be provided to this device can also for rear class equipment; For order program service, this device also for rear class equipment complete 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 (being mainly optical node place) by coaxial cable distribution net network.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 WiFi adapter by WiFi wireless channel, in subscriber household, also may there be in addition PC or other electronic equipments to be connected to WiFi adapter by Ethernet cable, these equipment can receive the digital television code stream that WiFi adapter sends, and realize and the connected sum of the Internet and the interaction of front end VOD system by WiFi adapter.On each WiFi digital TV terminal, need to install live or program request digital television application software, and and the data communication protocol between WiFi adapter generally as the bottom module of this software, exist.
Due to WiFi adapter within the family portion served as the role of the shared qam demodulator of one or more Digital Television client that does not possess QAM demodulation hardware itself, so it need to possess all functions that should possess in Digital Television client device as QAM demodulation hardware.
In order to save power consumption, after adapter is installed, in the situation that not connecting 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.
After contacting with the foundation of WiFi Digital Television client, first WiFi adapter wants management and control agreement to obtain the live of current network and program request QAM frequency configuration.Wherein in live frequency configuration information, the most important thing is dominant frequency point, this frequency has comprised and has carried out the necessary network information table of web search (NIT); Program request frequency configuration is mainly the list of the descending QAM passage of one's respective area program request, and the position in descending QAM passage that is marked at that is used for identifying stream district (in same flow district, the ID of each program request downlink transfer stream must not repeat).
The digital television application program that runs on digital TV terminal may be program request (VOD) or live (Live TV).
One, program request application
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 WiFi adapter.Receive after this message, WiFi adapter 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, 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, the information such as the indicated Liu of mark district, TSID are consistent with what provide in configuration file; (B) QAM losing: the frequency at certain QAM place cannot lock, although or locked signal, cannot parse TSID or stream district information; (C) QAM of mistake: although the frequency at certain QAM place can lock, also can parse TSID Ji Liu district information, parse Liu district title or TSID and do not mate with the configuration information obtaining in advance.
Receive after the QAM scanning result message that WiFi adapter sends, client can be reported this result to the particular server assembly (being generally automatic discovery server) that is positioned at network edge in VOD system; In the packet of this report, the ID(that can add this client is generally MAC Address).VOD leading portion system to determine 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.
Program request client is initiated order request to the program request reply management server of VOD system.In this request, can comprise one by WiFi adapter provide, list for the descending QAM resource of this program request client program request visible, in upstate.Session establishment phase, the request program flow point that front end system is client prepares descending QAM resource (QAM title, frequency, traffic ID etc.), and by these Information encapsulations to issuing in the response packet of client.
After receiving the replying of on-demand session, client can send bit stream initiation message to WiFi adapter, has comprised the information such as udp port that frequency, modulation system, program number, the bit stream at the program place of needs transmission use number in this message.After WiFi adapter is received this request, can: (A) control certain demodulation module in idle condition, according to asked frequency and modulation system etc., carry out signal demodulation; (B) control the Multiplexing module of transmission flow demultiplexing/again, start the reception to elementary streams such as the sound of this program, videos; Demultiplexing module, according to indicated program number, is analyzed the PMT of program, 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, also needs to resolve ECM that program encryption mandate is relevant and the PID of 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, the PID field of these streams is replaced with to known fixed value; (C) control stream package module, every 7 the continuous transport stream frames of program elementary streams packet (length is 188 bytes) are encapsulated as to UDP message bag, then send to network protocol stack to transmit, transmission destination slogan is specified port numbers, and object IP address is the IP address of program request client.In said process, for example, if there is any one link to go wrong (demodulation module cannot locking signal, and demultiplexing module cannot be filled into data etc.), WiFi adapter all should send the wrong message of reporting to program request client.
Program request client is received bit stream data, starts deciphering, decoding broadcasting.In playing process, program request client may be suspended program, F.F., rewind down, the control operation such as broadcasting while selecting, these operating process by broadband access passage directly and the stream pushing server of VOD system carry out alternately.
Program finishes or user stops after program, and client sends to the session management server of VOD the request that stops current sessions on the one hand, sends the message that stops program transfer of data to WiFi adapter simultaneously.After WiFi adapter is received this request, can stop that the demodulation, demultiplexing of program data/are again multiplexing, code stream encapsulation etc., and discharge relevant resource (demodulator, the required filter of demultiplexing, buffering area etc.).
In said process, client sets up by the navigation server of Access Network and VOD system the electronic program guides (EPG) that communication link obtains request program.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.
Once after receiving the message of certain live client terminal start-up, WiFi adapter can be carried out following operation:
(A) check whether searched for live digital television program (whether having preserved live digital TV channel list), if do not had, start programme televised live search; (B) if preserved live digital TV channel list, check whether channel has renewal (whether changing to judge by comparing the version number that the version number of the NIT table of live Digital Television dominant frequency point preserved relatively), if there is renewal, channel searching again.The information comprising in 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.After receiving this message, the management control protocol of the CPU of WiFi adapter is processed submodule can send to live client by the live digital TV channel list of this locality preservation.Live client channel list, and be shown to user.After user selects certain channel, may ask to watch this channel, also likely ask the electronic program guide information of this channel.
When certain direct broadcast band is watched in user request, client can send the request of transmission direct broadcast band bit stream data to WiFi adapter, has comprised the information such as the program number of the channel that needs transmit, udp port that bit stream is used number in this request data package.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 is just included in the downlink radio frequency channel of QAM modulation.Therefore,, when live client will receive the EPG of certain channel, need to send to WiFi adapter the request of the EPG information that receives 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 after submodule receives this request, can: the QAM that (A) controls certain this channel place of demodulation module demodulation in idle condition modulates frequency; (B) Multiplexing module of transmission flow demultiplexing/again of indication CPU, reception and the parsing of startup to the EPG information of this channel, be specially: receive the Event Information Table (EIT) in the transport stream of this channel place frequency, and take the program number of this channel and go out the EIT sublist of this channel as coupling keyword filtration; Parse the programme distant information of this channel, and saved as an interim event (there is time started, duration and title in this channel, and certain program that may comprise program introduction being called " event ") list; (C) as replying that EPG is asked, to live client, send this list of thing.This list of thing of live client is also shown to user.
User exits after live client application, and client sends the instruction that stops program transfer of data to WiFi adapter.After the management control protocol processing submodule of the CPU of WiFi adapter is received this request, can stop that the demodulation, demultiplexing of program data/are again multiplexing, code stream encapsulation etc., and discharge relevant resource (demodulator, the required filter of demultiplexing, buffering area etc.).
If have a plurality of Digital Television client applications in operation simultaneously, WiFi adapter may send Digital Television (program request or live) bit stream data to a plurality of clients simultaneously.These programs may, in same transport stream, also may be dispersed in a plurality of transport stream.Because each transport stream will take a QAM modulation channels, therefore, WiFi adapter need to be supported how many Digital Television clients simultaneously, and its digital catv signal receiver module just need to configure how many demodulation modules.In all clients, all closed after its digital television application program, WiFi adapter will cut out its demodulation module hardware automatically, to save power consumption.
The WiFi adapter the utility model proposes also can be arranged in Set Top Box, as parts of Set Top Box.
Above-described embodiment is only for illustrating embodiment of the present utility model.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and variation, these distortion and variation all should belong to protection range of the present utility model.
Claims (7)
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 form;
(B) Internet Transmission parts, consist of Ethernet exchanging process chip, transformer, Ethernet physical interface terminal;
(C) master control and data processing unit, by transmission flow demultiplexing submodule, code stream, multiplexing submodule, code stream encapsulation submodule, network protocol stack submodule, management control protocol are processed submodule and are formed again;
Described wireless routing Switching Module comprises:
(A) Ethernet exchanging process chip;
(B) a plurality of ethernet signal transformers that are connected with Ethernet exchanging process chip successively and a plurality of lan interfaces and 1 Wide Area Network interface;
(C) WiFi process chip, is connected with Ethernet exchanging process chip by a Media Independent Interface;
(D) the wireless signal dual-mode antenna being connected with described WiFi process chip;
Described digital catv signal receiver module is by netting twine, or by differential lines to being directly 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, 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 use, this chip has some network ports to be connected to transformer and RJ45 Interface Terminal by Media Dependent Interface, one of them port is Wide Area Network interface, by this interface, be connected to family's broadband access terminal device, other interfaces are lan interfaces.
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 MII interface, this CPU is each WiFi work station main frame and the host assignment IP address that is connected to wireless routing Switching Module, realizes the control to route exchange chip simultaneously.
5. 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.
6. adapter as claimed in claim 5, is characterized in that: the ethernet mac layer circuit Integral design in described master control and data processing unit and described Internet Transmission parts.
7. right to use requires a digital television signal dissemination system for WiFi adapter described in 1, comprises the coaxial cable being 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 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 form;
(B) Internet Transmission parts, consist of Ethernet exchanging process chip, transformer, Ethernet physical interface terminal;
(C) master control and data processing unit, by transmission flow demultiplexing submodule, code stream, multiplexing submodule, code stream encapsulation submodule, network protocol stack submodule, management control protocol are processed submodule and are formed again;
Described wireless routing Switching Module comprises:
(A) Ethernet exchanging process chip;
(B) a plurality of ethernet signal transformers that are connected with Ethernet exchanging process chip successively and a plurality of lan interfaces and 1 Wide Area Network interface;
(C) WiFi process chip, is connected with Ethernet exchanging process chip by a Media Independent Interface;
(D) the wireless signal dual-mode antenna being connected with described WiFi process chip;
Described digital catv signal receiver module is by netting twine, or by differential lines to being directly 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103369382A (en) * | 2013-07-16 | 2013-10-23 | 王新兵 | WIFI adapter and digital television signal distribution system using same |
| CN105025371A (en) * | 2015-07-21 | 2015-11-04 | 深圳Tcl数字技术有限公司 | Program updating method and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103369382A (en) * | 2013-07-16 | 2013-10-23 | 王新兵 | WIFI adapter and digital television signal distribution system using same |
| CN105025371A (en) * | 2015-07-21 | 2015-11-04 | 深圳Tcl数字技术有限公司 | Program updating method and device |
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