CN1091881A - The public switch telephone network structure that is used for video request formula business - Google Patents
The public switch telephone network structure that is used for video request formula business Download PDFInfo
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- CN1091881A CN1091881A CN 93102489 CN93102489A CN1091881A CN 1091881 A CN1091881 A CN 1091881A CN 93102489 CN93102489 CN 93102489 CN 93102489 A CN93102489 A CN 93102489A CN 1091881 A CN1091881 A CN 1091881A
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Abstract
Public switch telephone network PSTN provides digital video signal from the video information supplier to the user residence.The user by PSTN with Standard Telephone Unit or by the ISDN packet network with specialized control equipment designated program.This request is sent to the designated information provider and sets up Digital Transmission connectedness between video information supplier and the central office.The Asymmetric Digital Subscriber Loop (ADSL) interface unit provides connection between central office and user by home loop, comes frequency multiplexing modulation digital video information with the speech information that is sent to the user, and supports the reverse control channel transmission of user to central office.
Description
The present invention relates to the structure of public switch telephone network (PSTN), more particularly, the switching fabric and being used to that relates to the voice and data of combination provides video supplier by long-range or intra-office through the method for PSTN to city user's connectedness.
The distribution of whole mobile video data is just carried out from early stage television broadcasting, to satisfy spectators' requirement.Video distribution the earliest is to realize by the point-to-point wiring between video camera and the video-frequency monitor.Soon later on, the above increasing sharply succeeded by the TV station of passing through the radio wave transmissions fixed program.In the sixties, set up community antenna television (CATV) (CATV) system, beginning provides to spectators in the broadcast reception border district breaks (off-air) TV signal.Abide by FCC(FCC) regulations, require CATV industry and break the broadcast singal distribution except providing needed, also to provide local channel and original program broadcast.Along with the demand of people, some cable network broadcast program sources have been set up to more television programs.Because cable television system can obtain broad bandwidth, so can be the additional available channel of new broadcast program.Yet broadcast program is normally prearranged, and allow spectators at the appointed time be tuned to for watching the specified channel of a certain specific program.
For additional income, just the insurance premium channel that cable television system begins to distribute the user that just has suitable descrambler to watch.The device of decoding will receive the insurance premium channel and decode video and audio-frequency information so that the output signal that provides standard TV receiver to receive.The expense of pay-per-view rating program is just payment later.These programs comprise film, live music meeting and the sport for all program of nearest projection.Wish to watch that user pay-per-view should send instruction to wired operator, so at the appointed time, user's descrambler can be activated, to allow to watch pay-per view program., the user is limited in the scheduled time and watches this program, and does not have to consider to provide program at the specified time and date of user to the user.
For example, belonging to bass reins in people's such as (Bessler) United States Patent (USP) 4755872 and has described the impulse pay per view system that uses for the wired system that unidirectional addressable frequency converter is housed.Some central offices of metropolitan areas provide ANI (ANI) information of the telephone number of representing wire user separately and represent cable watching or be cancelled the code of incident.These data are sent to the telephone communication unit (TCU) that is arranged on central office asynchronously.TCU delivers to data the telephone communication controller (TCC) that is arranged on the cable branch platform asynchronously.System controller receives from each user's data at this cable joint place, determines the address location of corresponding home terminal parts, his the internal affairs processing activity of Xingqi of going forward side by side.Controller mandate home terminal parts receive and decode desired program then.
At the eighties initial stage, technical progress causes the rapid surge of video cassette recorder (VCR), has set up thus to be used for second channel that video frequency program distributes.Ready-made video frequency program under the record can be sold and hire out to VCR owner in advance.There are the spectators of VCR can from many titles that are suitable for selling and hiring out, select program also to watch at a convenient time.The VCR owner also can utilize the specific function of VCR to watch program selectively in addition.Like this, arbitrarily time-out, F.F., rewinding and replay partial programme of spectators.; cost of being paid for this is convenient is: to local video tape sell and/or hire out the shop, waiting for that popular video frequency program becomes can be for selling and/or the video tape of taxi usefulness, goes home to watch videocassette, and also to return the video shop and give back the tape rented or the like a series of trouble.
For advantages wired and the two distribution program of videocassette is got up the programs recommended request formula of some wired operating personnel wired system.For example, the United States Patent (USP) 4506387 of Walter has been described a kind of program request formula wired system, and this system allows the user to select a video frequency program from library of programmes.The user sends this program request to central data station by special optic fibre control cable, by the optical fiber communication network this video frequency program is sent to the on-site DRS the user with high, rate-nonreal then.DRS goes back to the light data that received and is electric data then, and it is stored in user's the television set for afterwards real-time Transmission.
Boulder gram people's such as (Podock) United States Patent (USP) 5014125 has been described the interactive TV system that is used for transmitting by television system (for example cable system) freeze frame video image and sound accompaniment.Telephone network is used to set up the two-way communication path between spectators unit (Viewer ' s location) and the central location (central location).Belong to spectators' information and select the relevant instruction that is used to show and other data, be sent to central location from the terminal that is in viewer's location by means of the phone connection with spectators.Same phone connects the terminal that is used to the audio-frequency information from central location is transferred to spectators.User terminal combines audio-frequency information and the video information by other medium (for example special-purpose distribution cable) transmission.
Clarke people's such as (Clark) United States Patent (USP) 4761684 has been described a telephone access display system, and this system adopts cable television system of program data processor operation, wherein, and the video information that user's selection will show on public wire message way.The user uses telephone set visit data processor and selects by digital code of keyboard input of using touch-tone telephone will be by the video information of wired system broadcast.This data processor is handled the signal that produces, and retrieval is arranged in the ranks so that simultaneously to all users broadcastings from the video information of memory and with it.
Gordon people's such as (Gordon) United States Patent (USP) 4763191 has been described dialing (dial-up) the telephone network equipment that is used to ask the selection discerned.The calling subscriber puts through the dialing that is used to specific selection to send instruction by telephone network and watches number " 800 ".City and toll office visit centralized data base is so that for network server device provides route instruction, and this equipment is confirmed this request and provided this request for the cable TV distribution plant.ANI is forwarded to program together with this request supply (vendor) equipment automatically.This supply equipment provides the program of being asked via the addressable descrambler on calling party's television set by city telephone company to the calling party.
Meng Siluo people's such as (Monslow) United States Patent (USP) 4995078 has been described the television broadcasting system of using private cable, and the time that this cable is used for asking spectators is transmitted the selected program of spectators in real time to request spectators' television receiver.Spectators phone a certain specific program of central location program request and viewing time.Relevant user serves representative and answers incoming call and this information is sent to dispatching.On the other hand, " dialing automatically " device can be used to ask program, and this request directly is transferred to voice response system.If at the time that the requires selected film that is not ranked as yet, a suitable wire message way is just selected by this system, operating personnel start corresponding VCR so that transmit program in the time that is requiring.
The United States Patent (USP) 4381522 of Lambert (Lambert) discloses a kind of system, wherein sees from can phoning telephone company central location, and the video frequency program of selecting one of them channel through cable television system to broadcast.The timetable of the selected program of computer compilation transmits this program in the time that is ranked, and transmits the catalogue of all programs that are ranked on the private directory channel.Spectators monitor this catalogue channel, broadcast through cable to determine when that when desired video program is predefined in, then at the appointed time be tuned to specified channel so that watch this program.
The shortcoming of program request or wired system is owing to be applicable to that the quantity of cable channel of the not usefulness of distributing video frequency program is few, causes supplying with simultaneously the limited amount of the different programs that spectators watch.Along with the increase of insurance premium that is applicable to the wired system operator and pay-per-use video frequency program, almost there is not the still channel of spectators' use of empty available program.In addition, the VCR formula controlled function of the user's video frequency program that must abandon comprising that time-out, F.F. and rewinding etc. are desirable.
Existing people's suggestion is with the arbitrary way of telephone line as video distribution.The Video transmission system that the graceful people's such as (Goodman) in Gourde(G) United States Patent (USP) 5010399 is described is to utilize the existing telephone circuit to distribute video and control signal in the scope of residence.By means of filtering, under the situation that does not have interfering phone communication, be possible through current effective telephone line while transmission of video and control signal.This patent has comprised the extensive discussions about the problem of process ordinary telephone wiring transmission video signal.
The United States Patent (USP) 4849811 of gram Lay graceful (Kleinerman) has been described the digitlization single frames that utilizes Binary Frequency Shift Keying (BFSK) to transmit Voice ﹠ Video simultaneously by standard telephone line.Use frame grabber (frame grabber) that image transform is become the usefulness of standard N TSC signal for the monitor demonstration.
Therefore, when can obtain the less video frequency program of quantity allotted simultaneously in real time through existing cable television system the time, the capacity of system is subjected to the restriction of the available idle channels quantity of this system.In addition, wired distribution technique provides limited program to select, because many users must monitor that it is worthwhile that a certain specific selection is used dedicated channel at video frequency program in the duration with proof.Moreover wired system distributes video frequency program only to provide minimum program flexibility at customer-side, and video road availability and deciding.At last, do not get ready for real-time control of video.Therefore, this user is in the situation of programme content not being carried out the VCR formula control of standard.
Opposite with wired distribution, if as long as the system that frozen frozen mass is the words of video conference function uses PSTN limited bandwidth system often.Because this system only between the user and/or the connectedness between user and the video information supplier (VIPS) use PSTN, so under the broadband circuit situation that does not need to rent specially, the ability that does not exist the dynamic routing that is used for digital to television to select.This system also fails to provide the VCR formula function control of program.
Therefore, an object of the present invention is to use the parts of PSTN that request formula video frequency program is provided.
Another object of the present invention is to provide user's passage via PSTN to a plurality of video program sources.
Another purpose of the present invention is that the transmission to video frequency program provides the user to control in real time.
Further purpose of the present invention is to begin to ask to provide a video frequency program of selecting for the user in later predetermined of short duration processing blanking time.
According to an aspect of the present invention, the vision signal that provide from video information supplier (VIP) of public switch telephone network (PSTN) in numerous user residences.VIP stores and sends to PSTN to the compression of video data number format with relevant compression digital audio frequency data in the mode of combining.(used herein except as otherwise noted, phrase " vision signal " and " video data " comprise the digital video and the voiceband data signal of combination).
The user is furnished with a user interface section, and it comprises the home loop input node that is used to receive from the multiplex signal in subscriber's local loop.Separator is separated into video output signals and telephone subset signal to multiplex signal, and these output signals produce at output node separately.The interface equipment of corresponding central office (CO) is set at the CO end of each user loop node.The CO interface comprises the input circuit that is used for a receiving video signals and a telephone device signal.Video and telephone device signal are compound via the CO interface, and send separately user loop to as multiplex signal.
The voice conversion switch receives the telephone device signal and responds the telephone number data that is transmitted by the telephone device signal from the CO interface.Be the response telephone number, this change over switch provides assurance for audio signal is communicated to video entry (gateway) from the subscriber phone home loop.The voice conversion switch also provides telephonic connectivity in the band for other users on the network that is used for routine call communication.
Video entry responds to the control signal that receives from telephone subset so that provide the video dispatching data for VIP.Same digital cross-connection system (DCS) is reacted to video entry, receives and supplies with selected CO interface from video supplier's video data and video data.So, the vision signal from the video supplier is supplied with the user via DCSCO interface and subscriber phone home loop to user interface section.
Decoder is supplied with in output from user interface, and this decoder is finished the decompression and the extremely conversion of simulation of numeral of digitized video.This decoder also translates the digital audio signal that includes compression rear video signal, digital audio signal is converted to analog signal, and provide this output to the user.
This user interface also comprises and is used for digital command signal (is sent to the circuit of CO interface by user loop separately.These digital command signals comprise the video dispatching data that will offer video entry.This data key from the user to the CO interface is also supported the user's control through the video data that CO supplied with.Also can offer one to control data and be used to be sent to the data network of VIP to support the transmission of interactive video signal.
According to another aspect of the present invention, video storaging equipment provides from the intermediate conversion of VIP via the video data that DCS received.Video storaging equipment be controlled in case under user control for response provides VCR formula function from the digital command signal of user interface, promptly comprise: time-out, slow-speed, advance and reverse search, F.F. and fall back etc.These functions can use conventional infrared remote control equipment to obtain by artificial input or remote control at user interface.
Another feature of the present invention comprises the transmission of caller-identification information from the voice conversion switch to video entry.Video entry is transformed into the network address to caller-identification information, and this address information is passed to PSTN so that set up being communicated with between request call person and digital signal for billing purpose.Caller-identification information also is transported to the usefulness of VIP for User Recognition.VIP equipment utilization user's data address is that the data link that is connected with the user is set up in interactive video control.
Another feature of the present invention comprises that user's memory comes access data by the video dispatching unit.Access data is used to define and limit the access of system, VIP and the video frequency program title of per diem timing together with user totem information.Preprogrammed personal identification number (PINS) is used for override or redefine system access by the user.
According to another object of the present invention, the home loop that the connectedness between user residence and the central office is provided can be standard plug tip (tip) and annular telephone wire to, coaxial cable or optical fiber cable.
According to another aspect of the present invention, PSTN provides video data from VIP for the user residence.VIP provides the selectable output of digitalization compressed video/audio data program, these programs comprise: feature film, Music Television (MTV), medical science and commercial graphic, video telephone, video conference, court's hearing, distance learning, surveillance television, video game, home shopping and high definition television (HDTV).
The user loop transmission equipment is supplied with the user residence to the video data from the CO unit, and the user's designation data from the user residence is supplied with the CO unit.The user loop transmission equipment also transmits telephone service signals between user residence and CO.The CO change over switch receives the user's designation data from user loop, and the designation data supplying video is entered the mouth.Then, video entry is supplied with DCS to the video routing data, and then, DCS supplies with the user loop transmission equipment to the video data from VIP.
According to another feature of the present invention, be provided with data transmission device and be used for the user instruction data are sent to VIP.This data transmission device can comprise packet data network.
User loop comprises the home loop that is used to provide the connectedness between CO and the user residence.Central office's interface transmits video data to the user residence on home loop, and will comprise that user's control data of director data is sent to video entry from home loop.User interface transmits the user instruction data to the CO interface via home loop, and the video data supplying video output node from home loop.Home loop can comprise that standard plug tip and annular telephone wire are right, fibre-optic cable or coaxial cable.
According to another characteristic of the invention, the CO change over switch comprises that the voice conversion switch passes through this set switch of home loop and the connectedness of telephone device simultaneously between CO and user residence.Packet data network is used to provide the usefulness that supplies the control of video data from the video control data in subscriber's local loop to VIP.This system also can comprise a video buffer, and this buffer receives from the video data of DCS and responds video control signal and will look data and supply with the user loop transmitting device.
Via the user loop transmitting device video control data is offered video buffer is supplied with the user with control video data from the user residence.
According to another characteristic of the invention, be response user instruction data, video guide is selected single for the user provides from the video of the available video data of VIP.For another video frequency program sort method is provided, a certain inlet receives the director data from the CO change over switch, and provide thereupon (ⅰ) VAB voice answer back signal give the voice conversion switch and (ⅱ) the video routing data give DCS.Voice responding unit also is connected with video entry, so that provide schedule information to VIP.
The user loop transmission equipment comprises frequency division multiplex (frequency muitiplexor) device and demultiplexer, is used for merging and separates (ⅰ) digital video and voice data and (ⅱ) telephone service signal and mixed audio signal.The telephone service signal exchanges so that except digital video/audio data is transferred to the user between telephone device and CO voice conversion switch, also provides standard dial telephone business by the loop.In the user residence video data expander is set, is used for the digitized video and the voice data of compression are converted to analog output signal.
Above-mentioned and other purposes of the present invention, feature and advantage will be owing to becoming more obvious below in conjunction with the description of the drawings.
Fig. 1 shows by the total video data flow process figure of source of video information to the user;
Fig. 2 is the block diagram according to video request formula of the present invention system;
Fig. 3 is the function diagram of user interface section;
Fig. 4 is the spectrogram that shows the home loop demultiplexing;
Fig. 5 shows typical inside (in-the-home) structure, and process and the standard telephone service signal that the sends video that overlapping 1.544MBPS channel transmits is provided;
Fig. 6 provides access of single worker's high bit rate and the POTS(plain old telephone service on public copper loop) the block diagram of Asymmetric Digital Subscriber Loop (ADSL) system;
Fig. 7 is the logic diagram that is used to receive an inlet of user video instruction;
Fig. 8 be to use separately T1 and the block diagram of an alternative embodiment of the video request formula system in POTS loop.
Video request formula operating desk shown in Figure 1 adopts the existing parts of public switch telephone network (PSTN).This system's use compress technique stores the video information via the transmission of interoffice equipment that is used for afterwards.It is that the user serves for the client who lives that switchgear is positioned at central office (CO).The loop electronic equipment has improved the transmission characteristic in local copper loop so that the function of required enhancing is provided and allows to carry full-motion video information for PSTN.（full motion video information）。
Use with the coding techniques that has decompression algorithm compatibility now and earlier analogue video signal is converted to number format, and will be by (the ISO of International Standards Organization
S) film panel of expert (MPEG) developed and seek unity of standard.Each title comprises video information, and this information has been stored in the general data treatment facility of video program's storehouse effect as addressable data file.
Its couples together the function that foundation is connected with monitor communication user's end port of the video program's storehouse port that transmits selected information and the information of reception by the Management Controller execution such as network control system, for example, FLEXCOM software is used for controlling the electronic digit cross connect switch (DCS) of PSTN.The DCS that also is used for switch two-way DS-1 speed rates is suitable for providing in addition and is the broadcasting that some users provide video information along separate routes.Providing at video program's storehouse port with for video request formula equipment that normal " data session " between the port of inlet control is by a performed function of the CPU in video program storehouse.This network control software and attached processor are controlled at the video request formula and go out " network dialogue " between inbound port and the user port.Attached processor is also preserved the record about the related data of the each dialogue that forwards user's charge system to.
DCS is received in the subscriber's local loop that is equipped with Asymmetric Digital Subscriber Loop (ADSL) (ADSL) equipment.Video request formula system guarantees to transmit unidirectional 1.544 megabit per seconds (MBPS) signal via identical twisted pair (transmitting speech information to residential customer) simultaneously.The ADSL that transmits signal is used the mpeg standard technology that 1.544 parts are translated so that transmit the full-motion video signal by demultiplex (demultiplex) then.In PSTN, optical fiber technology will replace the connectedness between existing coaxial cable and the twisted pair with the function of the facility switching of corresponding increase and Route Selection.
With reference to Fig. 2, the video request system comprises the CO equipment 10 of a part that belongs to PSTN, and CO 10 provides by VIP140 and 160 the video/audio connectedness by system to user 100 and 120 selectively.
ADSLs16 and 18 uses the frequency multiplexing modulation techniques that the data on user loop 20 and 22 are carried out the multichannel modulation, and available loop bandwidth is divided into three segmentations shown in Fig. 3 and 4.Be lower than the connectedness that the base-band audio of 4 kilo hertzs (KHz) and signal are provided for the Plain Ordinary Telephone Service that can obtain in (POTS) in " plain old telephone system ".On the other hand, the ISDN channel need use the end as 80KHz [bottom 80 KHz of) loop bandwidth.Backward channel digital packet information be positioned 80 and 90KHz between, via the D channel interface provide about 16 kbps (KbPS) from the user residence to packet switching network the connectedness of (for example isdn network).Compressed digital video information be included in 100 and 400KHZ between so that 1.6MBPS is provided channel, be used for video/audio data (through being sent to user residence 100 and 120 loops 20 and 22 separately).
The function of ADSL multiplexer is shown in Fig. 3.With multiplexer 200 supports of adsl line 202 combinations and the independent right transmission of unloaded copper end of unidirectional 1544MBPS digital signal process of POTS or base rate isdn signal.This structure equals 18000 feet copper loop by length provides service for the user, thereby consistent with carrier-serving area (CSA) and resistive arrangement rule.Unique further restriction is that the loop must be unloaded.
With reference to Fig. 4, the transmission system of ADSL provides three transmission windows on the basis of frequency division multiplex.Window by zone 302 expressions provides a two-way channel, is used for providing standard P OTS business and ISDN(2B+D via adsl line) business.Window 304 is one low speed data channels to up (user is to CO).This channel has the bandwidth of 32KBPS.The 16KBPS of this window is used for transmission and operates, manages, keeps in repair and provide (OAM﹠amp; P) be used for the data of ADSL unit.The 16KBPS of the D channel interface compatibility of remaining and ISDN-BRI is used to connect with ISDM packet switched switching surface, and the user can be linked mutually with network and/or 1.544MBPS signal providers.
Window 306 is one digital signals to descending (CO is to the user), provides 1.544MBPS transfer rate (is 1.6MBPS with overhead transmission line) for transmitting the digitalization compressed vision signal.The digital downstream signal that merges uses the DS1 bit table by the ANSIT1.403-1989 regulation.
Because data channel 304 and 306 is unidirectional, this system is not subjected to from cross-talk (near-end crosstalk NEXT).This just allow aspect interface concentrate and from the interference of impulsive noise, because the ADSL system is loss restriction rather than NEXT restriction.So, expose by using the passband technology can reduce impulsive noise because impulse noise effect is maximum opposite with the base band method when 40KHz is following.Therefore, adopt base band quadrature amplitude modulation (qam) system to be better than using the IBlQ baseband system.
With reference to Fig. 4, the lower curtate edge of window 306 is located at 100KHz.Selecting this edge is for making minimize degree and allow baseband channel 302 and backward channel 304 can obtain suitable bandwidth of channel loss, and for reducing to minimum from the interference of impulsive noise.The design of interface has guaranteed the zero defect operation when ringing voltage occurs on the line.This system also is designed to avoid the influence of on-hook and off-hook transient state and dial impulse excitation.Except that base band POTS business, the ADSL system can also exist simultaneously with other transmission systems (for example HDSL High-Speed Digital Subscriber Line＜HDSL〉D1, T1 and data circuit).
Fig. 5 shows typically, district's inner structure, and it provides the video that transmits through the 1.544MBPS channel.The unidirectional 1.544MBPS signal that is transported by the ADSL system is not that to have superframe format (sf) be exactly the superframe format (ESF) with expansion.Superframe format comprises 24 8 continuous bit words, is that every frame adds up to the bit that 193 bits are called framing bit (F-bit) in its front.The F-bit be timesharing so that make adsl interface device synchronization and identification signal framing (signaling framing).12 continuous frames form a superframe.The line code of using together with superframe format is a twin-stage type return-to zero system, also is commonly referred to as alternate mark inversion (AMI).
The ESF form is made up of 24 continuous frames, and every frame adds up to 193 bits, and every frame comprises by 192 leading information bits of a F-bit.The F-bit is used for basic frame synchronization, cyclic redundancy check (CRC) and data link.24 frames are formed a superframe.The line code of using together with ESF is not that the AMI of 8 bipolar with zero substitutions (B8ZS) is exactly the AMI of zero byte time gas exchange (ZBTSI).
The adsl interface unit of user and Co is by synchronously to guarantee that two unit all derive regularly from master clock, in order to avoid obliterated data.Separate unit is derived regularly from the 1.544MBPS signal of coming in.User and adsl equipment are by user residence supply capability on the spot.The adsl equipment that is installed among the CO is powered by direct current (DC) input voltage between-42.5 and-55 volts of direct currents (VDC).
Fig. 6 is the block diagram of ADSL system, and this system provides single worker's high bit rate video data and the POTS by public copper loop the connectedness to the user.The ADSL system has the transmittability that the POTS that modulated by multichannel by base band or ISDN elementary path are carried unidirectional high bit rate data flow.
Fig. 2 illustrates two user residence structures 100 and 120.In user residence 100, use the standard P OTS business that is equipped with the telephone device 102 that docks with voice conversion switch 12 by user's adsl interface 104 to send video instructions.100 user connects voice conversion switch 12 by means of the voice response unit (vru) 34 of VDT inlet 32 and uses telephone device 102 request transmission video datas in the residence.Fig. 7 is the operational flowchart that shows the VRU34 that is used for layout video information order.
With reference to Fig. 7, voice conversion switch 12 has been set up the connectedness with the VRU34 that replys incoming call.The VRU prompt closes the user of user ID, and this user ID is to import via the dtmf key dish of telephone device 102.User ID is verified, if effectively, VRU just points out video to select.Use the dtmf key dish input video of telephone device 102 to select then, and selection information is delivered to video information supplier (VIP) via video entry 32 and packet data network 40.The exercise question that VIP identification is asked also determines whether this exercise question can obtain.
If found this exercise question, and before be not discharged into transmit queue, then corresponding data file is opened, and is that transmitting video data to DCS node 26 makes a mark for standby idle communication port.Be response at first the video of request select, predetermined some minutes is postponed in the transmission of data, so as simultaneously this video data file to be sent to the instruction of in timing period, sending same exercise question after serve the user.Qing Qiu instruction afterwards also enters in the formation, and relevant communication port ID and user's the network address is matched.
After the predetermined delay expiration, that is to say, current time as shown in flow chart is when equaling the start-up time of appointment, video data file from VIP140 or 160(when suitable) be transported to the adsl interface 16 and 18 of appointment for the usefulness that is sent to user residence 100 and 120 by DCS node 24 and 26.At the end of program, message is sent to network management system 28 so that by the connectedness that stops between DCS node 24 and 26 system is dismantled.
In the enhancement mode of video request formula system, be to receive data command, user residence 120(Fig. 2 from remote controller 132) be equipped with control unit 130.Remote controller 132 can be general being used for and control unit 130 synergistic infrared remote controllers.For director data being sent to ISDND-channel interface 38, the data from control unit 130 are supplied with user's adsl interface 124.The ISDND-channel interface replaces using VAB voice answer back unit 34, can user instruction information is provided directly for video entry 30.In case video entry 32 is determined user request and sets up the connectedness between VIP140 or 160 that then the address of control unit 130 just is supplied to selected VIP.When receiving the corresponding VIP network address, just set up the direct connectedness of process packet data network 40 between control unit and VIP140 or 160 by control unit 130.This connective immediate data of permitting between user residence and the relevant VIP shifts, to support being used in synergistic then educational programs and synergistic video shows synergistic video control used in (for example video game).
VIPs140 and 160 comprises the control unit separately 142 and 162 that is used for accessing video memory cell 144 and 164.As discussed above, VIP is with the stored in digital format programme content of being asked of coding or compression so that with memory requirement and the transmission bandwidth degree that minimizes.Suitable video coding algorithm relies on motion compensated prediction (MCP) and motion compensated interpolation (MCI).The king people such as (wong) who publishes on the ieee communication magazine of publishing November nineteen ninety shows in the article that is entitled as " video coding algorithm of MCPIc transmission and storage application facet " and has described motion compensated prediction/interpolation coding (MCPIC).MCPIC carries out preliminary treatment and encodes the compression of video information is provided with the VCR reproduction quality that obtains coded bit stream to video source information for adopting.This bit stream is represented the form that goes forward one by one of per second 30 frames, and each frame contains 352 * 240 sample values that are useful on brightness (Y) and is used for two chrominance channes (U and V) respectively 176 * 120 sample value.The support of MCPIC algorithm has the video data of the resolution that is equivalent to consumer's grade (Consumer-grade) VCR from microinching to the rapid movement scope.
International Organization for Standardization film panel of expert (MPEG) supports to use the another kind of compress technique of motion budget, motion compensated predictive coding and adaptive discrete cosine transform (DCT) quantification.MPEG-1 has stipulated a kind of video coding algorithm of the 1.2MBPS of having data rate.This digital video and digital audio compression standard can be held so that provide full-motion video to the user residence within the 1.544MBPS data channel that ADSL provided by T-1 circuit or D-1 channel.MPEG programmable decoder/processor (can deduct the compression of digital video in real time) is by like this C-Cube micro-system and the Infineon Technologies Corp. in some companies such as California, USA San Juan city) produce.These or similar equipment are loaded into decoder shown in Figure 2 106 and 126, to produce NTSC standard analog video and simulated audio signal.
Outside the elementary video request formula architecture as shown in Figure 2, under software control, other features also can be included PSTN in.For example, the user can by change over switch 12 select to implement call congestions to avoid the video frequency program duration owing to come in to call out and cause interruption.The calling of coming in then is sent to user's voice mailbox (Voice mail box).
VRU34 can comprise in addition that voice recognition capability is to support the speech selection of speech recognition safety function and video frequency program.
Another alternative embodiment of the present invention is shown in Fig. 8, wherein: the connectedness between the 10a of central office and user residence 100a and the 120a by separately high bitrate digital subscriber line road (HDSL) and independently the POTS circuit provide.HDSL uses two-way four line T1 line 48 and 50(to comprise repeater 52 and 54) office's repeater shelf (ORB) 44 and 46 is received customer service unit (CSU) and be positioned at the digital service unit (DSU) 110 and 134 of each user residence 100a and 120a.HDSL needs two lines right, and provides the usefulness of full duplex transmission for the loop that is limited in the CSA critical field with DS1 speed.Because HDSL does not provide the low bit rate data channel, the data from the user residence to CO are utilized the professional transmission of the two-way T1 of full duplex.On circuit 56 and 58, be provided with independently POTS business.User loop also can comprise copper digital loop carrier (DLC), and wherein analogue data is converted into number format, and is transmitted through T1 copper line circuit.In addition, all the other structures of video request formula shown in Figure 8 system and operation generally with discussed about embodiment illustrated in fig. 2 the same.
Although now the present invention is described in detail and illustrates, much less, the above just limits for the example that says something rather than the condition of being used as, and the spirit and scope of the present invention are only limited by the clause of appended claims.
Claims (50)
1, being used among many users residence any one provides public switch telephone network from video information supplier's vision signal, comprising:
Be positioned at many user's interface devices in corresponding each described user residence, respectively comprise:
(i) be used to receive the home loop input node of multiplex signal;
(ii) be used for described multiplex signal is separated into the separator of video output signals and telephone subset signal, and
(iii) be used to supply (a) video output signals of described separation and the output node of described (b) telephone subset signal; Many subscriber's locals loop of the communication connectivity the relative users loop node from a corresponding described user's interface device to central office is provided;
Be positioned at many central offices interface arrangement of central office, respectively comprise:
(i) user video that is used for receiving video signals is imported node and the telephone subset node that is used to receive the telephone device signal,
(ii) be used for the combiner apparatus of described vision signal and the synthetic composite signal of described telephone subset sets of signals, and
(iii) be used for providing the home loop output node of described multiplex signal to a corresponding described user loop node,
Reception is used to provide voice conversion switch from the subscriber phone home loop to the audio signal connectedness between the video entry from the telephone device signal of described telephone device node and according to the telephone number data that described telephone device signal is transmitted;
Response is used for providing to described video information supplier the described video entry of video dispatching data from the control signal that telephone subset received; And
Reception responds the cross connect system that described video dispatching data are used for providing to selected each described central office interface arrangement described video data again from described video supplier's video data.
2, the public switch telephone network according to claim 1 also comprises decoder device, and this device receives from the corresponding output node video output signals of a corresponding described user's interface device and analog video output signal is provided thereupon.
3, according to the public switch telephone network of claim 2, it is characterized in that: described decoder device comprises and receives described video output signals and provide described analog video signal and the pressure reducer of relevant simulated audio signal thereupon.
4, according to the public switch telephone network of claim 1, wherein:
Each described user's interface device also comprises the device that is used for transmission digital command signal on corresponding each described subscriber's local loop, and
Corresponding described central office interface arrangement respectively comprises the digital control link output node that is used to provide described digital command signal,
Described video entry responds described digital command signal and is used to provide described video dispatching data;
5, according to the public switch telephone network of claim 1, wherein:
Each described user's interface device comprises that also the device that is used for transmission digital command signal on corresponding each described subscriber's local loop reaches
Corresponding each described central office interface arrangement comprises the digital control link output node that is used to provide described digital command signal,
Described public switch telephone network also comprises:
Be used for transmitting the data network device of described digital command signal to described video information supplier.
6, the public switch telephone network according to claim 1 also comprises:
Be positioned at the video memory device away from described user residence, described video memory device buffering provides buffered data from the described video data of described cross connect system and to a described described central office interface arrangement of selecting.
7, according to the public switch telephone network of claim 1, also comprise:
Be positioned at video memory device away from described user residence, described video memory device responding digital command signal is used to cushion the described video data from described cross connect system, and provide described buffered data to a described described central office interface of selecting, wherein:
Each described user's interface device also comprises the device that is used for transmitting described digital command signal on corresponding each described subscriber's local loop, and
Corresponding each described central office interface arrangement comprises the digital control link output node that is used for providing to described video memory device described digital command signal.
8, according to the public switch telephone network of claim 1, wherein: described voice conversion switch also provides caller-identification information so that provide network address information to described cross connect system to described video entry, and described cross connect system responds described networking address date and is used for providing described video data to a described described central office interface arrangement of selecting.
9, according to the public switch telephone network of claim 1, wherein: described video entry also comprises the memory of stored user access data, with response user totem information and described stored access data, described video entry provides described video dispatching data to described video information supplier.
10, according to the public switch telephone network of claim 1, wherein: described home loop comprises that corresponding plug tip and annular telephone wire are right.
11, according to the public switch telephone network of claim 1, wherein: described home loop comprises corresponding optical fiber cable.
12, according to the public switch telephone network of claim 1, wherein: described home loop comprises corresponding coaxial cable.
13, according to the public switch telephone network of claim 1, wherein: described home loop comprises the copper digital loop carrier.
14, be used for selectively providing public switch telephone network, comprise from video information supplier's video data to the user residence:
User loop transmitting device: be used for providing described video data, provide from the user instruction data in described user residence and be used between described user residence and described central office, transmitting the telephone service signal to described central office unit from the central office unit to described user residence;
Transfer switch unit at described central location: be used for receiving described user instruction data from described user loop transmitting device;
The video entry device: response is used to provide the video route data from the described user instruction data of described transfer switch unit; And
Cross connection device: respond described video route data, be used for providing described video data from described video information supplier to described user loop transmitting device.
15, according to the public switch telephone network of claim 14, also comprise the data transmission device that is used for transmitting described user instruction data to described video information supplier.
16, according to the public switch telephone network of claim 15, wherein: described data transmission device comprises packet data network.
17, according to the public switch telephone network of claim 14, wherein: described user loop transmitting device also comprises:
Home loop: be used to provide the connectedness between described central office and the described user residence;
Central office's interface arrangement: be used on described home loop, transmitting described video data, and send described user instruction data from described home loop to described video entry to described user residence; And
User's interface device: be used on described home loop, transmitting described user instruction data, and be used for providing described video data from described home loop to the video output node to described central office interface arrangement.
18, according to the public switch telephone network of claim 17, wherein: described home loop comprises that plug tip and annular telephone wire are right.
19, according to the public switch telephone network of claim 17, wherein: described home loop comprises optical fiber cable.
20, according to the public switch telephone network of claim 17, wherein: described home loop comprises coaxial cable.
21, according to the public switch telephone network of claim 14, wherein: described transfer switch unit comprises voice conversion switch and described user loop transmitting device, further comprises:
Home loop: be used to provide the connectedness between described central office and the described user residence;
Central office's interface arrangement comprises:
(ⅰ) being used for transmitting first of described video data to described user residence on described home loop installs;
(ⅱ) be used to that described voice conversion switch and described home loop face are connect and be used for second device of Data transmission betwixt; And
User's interface device comprises:
(ⅰ) be used to receive by the described video data of the described first device transmission with at output node the 3rd device of described video data is provided, and
(ⅱ) be used to the 4th device that telephone device and described home loop face are connect, be used for by described second device transferring data between them thereby make described telephone device be received described voice conversion switch.
22, according to the public switch telephone network of claim 14, wherein: described user instruction data are that transfer switch unit that be transmitted as digital signal and described comprises the digital interface that is used for transmitting to described video entry described digital signal.
23, according to the public switch telephone network of claim 14, wherein: described user instruction data are transmitted as analog signal, and described transfer switch unit comprises the analog interface that is used for transmitting to described video entry described analog signal.
24, according to the public switch telephone network of claim 14, also comprise:
The grouped data networking, wherein:
Described user loop transmitting device comprises and is used for providing device from the video control data in described user residence to described packet data network that described packet data network provides described video control to be used to control described video data to described video information supplier.
25, according to the public switch telephone network of claim 14, wherein: described video entry device also responds the subscriber identity data from described transfer switch unit, is used for providing described video route data to described cross connect system.
26, according to the public switch telephone network of claim 14, comprise in addition:
Reception is used for providing to described user loop transmitting device the video buffer apparatus of described video data from the described video data of described cross connect system and response video control signal.
27, according to the public switch telephone network of claim 26, wherein: described user loop transmitting device comprises and is used for providing device from the described video control data in described user residence to described video buffer, is added to the usefulness of the described video data of described user loop transmitting device for control.
28, according to the public switch telephone network of claim 14, comprise in addition:
Responding described user instruction data is used for providing from video directory enquiry (directory) device of the videogram of the available video data of described video information supplier to described user residence on described user loop transmitting device.
29, according to the public switch telephone network of claim 14, comprise in addition:
Reception is from the described director data of described transfer switch unit, is used for providing the voice answer-back signal to transfer switch unit and the described video routing data voice answer device to described cross connect system thereupon.
30, according to the public switch telephone network of claim 14, wherein: described user loop transmitting device comprises multiplexer and demultiplexer.
31, according to the public switch telephone network of claim 14, comprise in addition: receive the video data decoder device that is used to provide analog video output signal and analogue audio frequency output signal from the described vision signal of described user loop transmitting device.
32, be used for selectively providing public switch telephone network, comprise from video/audio information supplier's video/audio data to the user residence:
Be used between central office and each user residence, providing many home loops of connection; Be used for (ⅰ) to selected each described home loop transmit digital video/audio data and (ⅱ) to and central office's interface arrangement of telephone device signal data and voice signal is provided from corresponding each described home loop;
Being used for (ⅰ) provides from the described digital video/audio data of corresponding each described home loop and (ⅱ) makes corresponding telephone device and described home loop face connect user's interface device with transfer telephone device signal data and voice signal between them to the video/audio output node;
Receive the video/audio decoder device that described digital video/audio data is used to provide analog video and audio signal;
Voice conversion switching device in described central office, being used to receive from the described telephone device signal data and the voice signal of described central office interface arrangement and responding described telephone device signal data provides the user instruction data;
Response is used to provide the video/audio inlet device of video/audio routing data and data dispatching from the described user instruction data of described transfer switch unit;
Responding described video/audio routing data is used for providing cross connection device from described video/audio information supplier's described video/audio data to described user's interface device;
Be used for providing the digital data network device of described video/audio data dispatching to described video/audio supplier.
33, according to the public switch telephone network of claim 32, wherein: described home loop comprises that separately plug tip and annular telephone wire are right.
34, according to the public switch telephone network of claim 32, wherein: described home loop comprises optical fiber cable separately.
35, according to the public switch telephone network of claim 32, wherein: described home loop comprises coaxial cable separately.
36, according to the public switch telephone network of claim 32, wherein: multiplexed and described telephone device signal data of demultiplex (ⅰ) of described central office and user's interface device and voice signal and (ⅱ) point to and from the described video/audio data of corresponding each described home loop.
37, according to the public switch telephone network of claim 32, comprise in addition:
The video control device that the video control data is provided provide in described user residence,
Wherein: described user's interface device comprises in addition and is used for sending the device as the described video control data of digital signal from described user residence to described central office, for the usefulness of the described digital video/analogue data of control.
38, according to the public switch telephone network of claim 32, comprise in addition:
Be arranged on and be used to the video/audio buffer unit that receives described digital video/audio data and be used for providing the buffer digital video/audio data outside the described user residence to described user's interface device.
39, be used for providing central office's change over switch to the user residence selectively from video information supplier's video data by the user loop transmitting device, described user loop transmitting device provides described video data from described central office unit, provides from the user instruction data in described user residence and between described user residence and described central office to described central office unit and transmit the telephone service signal to described user residence, and described central office change over switch comprises:
Be used to receive transfer switch unit from the described user instruction data of described user loop transmitting device;
Described user instruction data from described transfer switch unit are responded, be used to provide the video entry device of video routing data; And
Described video route data responded be used for providing cross connection device from described video information supplier's described video data to described user loop transmitting device.
40, according to central office's change over switch of claim 39, also comprise the data transmission device that is used for transmitting described user instruction data to described video information supplier.
41, according to central office's change over switch of claim 39, wherein: described data transmission device comprises packet data network.
42, according to central office's change over switch of claim 39, wherein: described transfer switch unit comprises the voice conversion switch.
43, according to central office's change over switch of claim 39, wherein: described user instruction data are transmitted as digital signal, and described transfer switch unit comprises the digital interface that is used for transmitting to described video entry described digital signal.
44, according to central office's change over switch of claim 39, also comprise:
Packet data network, wherein:
Described user loop transmitting device comprises and is used for providing device from the video control data in described user residence to described packet data network that described packet data network provides described video control to control described video data to described video information supplier.
45, according to central office's change over switch of claim 39, wherein: the subscriber identity data that described video entry device also responds from described transfer switch unit is used for providing described video routing data to described cross connect system.
46, according to central office's change over switch of claim 39, comprise in addition:
Reception is used for providing to described user loop transmitting device the video buffer apparatus of described video data from the described video data of described cross connect system and response video control signal.
47, according to central office's change over switch of claim 46, wherein: described user loop transmitting device comprises and is used for providing the device that is added to the described video data of described user loop transmitting device from the described video control data in described user residence with control to described video buffer apparatus.
48, according to central office's change over switch of claim 39, comprise in addition:
Reception is used for the voice answer device that then provides the VAB voice answer back signal to transfer switch unit and described video routing data is provided to described cross connect system from the described director data of described transfer switch unit.
49, according to central office's change over switch of claim 39, comprise in addition be used for to described user loop described video data from described cross connection device is provided, receive from the described director data of described user loop and be used for to multiplexer and demultiplexer that described telephone service signal is provided from described user loop.
50, provide method from video information supplier's VDT instruction traffic by public switch telephone network (PSTN) to the user residence, this method may further comprise the steps:
Receive the electronic user director data through described PSTN;
Transmit the video request data for selected video information supplier;
Foundation is the service of described user residence by the numeral connection of described video supplier to central office;
Video information and the telephone service signal combination from the described video information supplier that provide via described numeral connection are got up to form multiplex signal;
Transmit described multiplex signal through user loop to described user residence by described central office to described user residence; And
Described multiplex signal is divided into output digital video signal and telephone service signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93102489 CN1091881A (en) | 1993-03-01 | 1993-03-01 | The public switch telephone network structure that is used for video request formula business |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93102489 CN1091881A (en) | 1993-03-01 | 1993-03-01 | The public switch telephone network structure that is used for video request formula business |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1091881A true CN1091881A (en) | 1994-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93102489 Pending CN1091881A (en) | 1993-03-01 | 1993-03-01 | The public switch telephone network structure that is used for video request formula business |
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| Country | Link |
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| CN (1) | CN1091881A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1613249B (en) * | 2002-01-11 | 2010-05-12 | 汤姆森许可公司 | Directory delivery system and method for a digital subscriber line modem |
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1993
- 1993-03-01 CN CN 93102489 patent/CN1091881A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1613249B (en) * | 2002-01-11 | 2010-05-12 | 汤姆森许可公司 | Directory delivery system and method for a digital subscriber line modem |
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