CN1322757C - Universal digital broadcast system and methods - Google Patents
Universal digital broadcast system and methods Download PDFInfo
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- CN1322757C CN1322757C CNB018007562A CN01800756A CN1322757C CN 1322757 C CN1322757 C CN 1322757C CN B018007562 A CNB018007562 A CN B018007562A CN 01800756 A CN01800756 A CN 01800756A CN 1322757 C CN1322757 C CN 1322757C
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Abstract
The present invention teaches methods and systems for providing full digital services such as VOD, digital broadcast, as well as a universal set-top-box (STB) capable of handling this variety of digital services. A plurality of hardware architectures and complimentary data transmission methods identifying the distinct services through an electronic program guide enable such transmission. The universal STB of the present invention is capable of distinguishing the different services based upon information received in the electronic program guide, and is designed with unique hardware architecture including a large buffer. The present invention further provides viewing options such as multiple broadcasts and virtual VCR time-shifting features including pause, recording, and freeze-framing a broadcast without suffering the volatility and poor quality of an Internet streaming broadcast. Still further, this variety of digital services is provided via a uni-directional communication link.
Description
Technical field
The present invention relates to video request program and digital broadcasting technology.Specifically, the present invention has told about the method and system that is used to provide digital service (for example VOD, digital broadcasting, from the time shifting of any broadcast medium and the set-top box (STB) that can handle the data, services of all these kinds).
Background technology
Various mechanism can be used for coding and transmission of digital data.For example, International Standards Organization (below be referred to as " ISO/IEC ") has released a standard (MPEG-2) of encoding at moving image and relevant audio frequency.Since the generality of MPEG-2 with and with relation of the present invention, must have and will carry out some preliminary descriptions so have it.
The ISO/IEC Moving Picture Experts Group-2 is stated in 4 documents.Document ISO/IEC13818-1 (system) has stipulated the system coding of this standard.The document has defined one and has been used for the device of the required clocking information of Voice ﹠ Video data combination multiplexing structure together and the real-time playback synchronization sequence of representative.Document ISO/IEC 13818-2 (video) has stipulated the coded representation of video data and has re-constructed the required decode procedure of picture.Document ISO/IEC13818-3 (audio frequency) has stipulated the coded representation of voice data and has re-constructed the required decode procedure of voice data.Last document ISO/IEC 13818-4 (accordance) has stipulated to be used for to determine the feature of the bit stream behind the coding, and is used for detecting whether meet the requirement that document ISO/IE 13818-1, ISO/IE 13818-2, ISO/IEC 13818-3 are stated.Now these 4 documents (common formation " Moving Picture Experts Group-2 ") are incorporated into herein, with for referencial use.
In the digit broadcasting system environment, a multiplexed bit stream that meets Moving Picture Experts Group-2 is " transport stream " wrapping and comprise the bag structure of other necessary information according to " grouping is stream substantially " (being PES)." grouping is stream substantially " (being a PES) bag is a data structure that is used for delivery " basic flow data "." basic stream " is the audio frequency an of video at a general term (a) coding of one of following situation, (b) coding or (c) has one and only have the bit stream of other coding that delivers in the PES packet sequence of a stream ID at one.The transport stream support from one have one common time base the video of program and audio compression stream multiplexed.
Prior art Fig. 1 has illustrated the video data 106 of the compression of video sequence 102 has been grouped into a PES bag stream 108, has been grouped into the grouping process of the stream of a transport stream packets 112 then.Specifically, video sequence comprises the video data 106 of a plurality of 104 and relevant compression.Video sequence 102 is resolved to the section of a plurality of variable-lengths, and each section has a relevant PES packet header 110, to form PES bag stream 108.Then PES bag stream 108 is resolved to a plurality of sections, for each section provides a transport stream header 114, to form a transport stream 112.The length of each transport stream packets of transport stream 112 is 188 bytes.
Transport stream allows one or more program set with one or more independent time base to synthesize a single stream.Contain under the situation of noise in storage and conveyer, transport stream is useful.The grouping of the flow velocity of transport stream and their constituent is flowed (PES) substantially and can be fixed, and also can change.This flow velocity is defined with reference to the value and the position of (or claiming PCR) field by the program clock in the transport stream.
A PES bag, as defined in the Moving Picture Experts Group-2, comprise a PES packet header, this packet header comprises one 24 beginning code prefix field, one 8 flow identifier field, one 16 PES packet length field, an optional PES head, and payload, promptly data division 706.In the Moving Picture Experts Group-2 all these fields are described.
Moving Picture Experts Group-2 concentrates on the coding of video and voice data and transmission aspect.Generally speaking, Moving Picture Experts Group-2 uses compression algorithm, so that can more effectively be stored and transmit video and voice data.
What prior art Fig. 2 described is the structure chart of a digit broadcasting system 200, and digit broadcasting system 200 comprises a digital broadcasting server 202 and a set-top box 204 that is applicable to the processing digital broadcast data.Fig. 2 has not only illustrated the parts of system, but also coding, transmission (from digit broadcasting system server 202 to set-top box 204) has been described and according to the process stream of Moving Picture Experts Group-2 decoding video and voice data.As known, typically having earlier in the broadcasting method, the Moving Picture Experts Group-2 transport stream is being used with a stream mode.
At digital broadcast service device 202 places, video data is provided in a video encoder 206, video encoder 206 is according to Moving Picture Experts Group-2 (stipulating in document ISO/IEC 13818-2) coding video frequency data.Video encoder 206 sends the video 208 after encoding to a burster 210, the video 208 after burster 210 block encodings.Then the video 212 behind the coding of the grouping that is provided by burster 210 is provided in transport stream multiplexer 214.
Similar, at digital broadcast service device 202 places, voice data is provided in an audio coder 214, audio coder 214 is according to Moving Picture Experts Group-2 (stipulating in document ISO/IEC 13818-3) coding audio data.Audio coder 214 is provided in a burster 220 to the audio frequency 218 after encoding, the audio frequency 218 after burster 220 block encodings.Then the audio frequency behind the coding of the grouping that is provided by burster 220 222 is provided in transport stream multiplexer 214.
Voice ﹠ Video bag behind the transport stream multiplexer 214 multiplexed codings, and resulting multiplex stream is transmitted in a set-top box 204 by distributed basis facility 224.This distributed basis facility 224, for example telephone network and a cable TV (CATV) system can use optical fiber and adopt Asynchronous Transfer Mode (ATM) host-host protocol.At set-top box 204 places, on a remote port of distributed basis facility 224, a transport stream demultiplexer 230 receives multiplexed transport stream.According to the bag identification number of a concrete bag, transport stream demultiplexer 230 decomposes the Voice ﹠ Video bag behind the coding, and video packets is offered a video decoder 232 by link 238, by link 240 audio pack is offered a tone decoder 236.
Transport stream demultiplexer 230 also offers a clock control cell 236 to clocking information, and the clocking information that clock control cell 236 provides according to transport stream demultiplexer 230 (for example according to the value in the PCR field) offers video decoder 232 and tone decoder 236 to timing output.Video decoder 232 provides corresponding to the video data that offers video encoder 206 at first.Similar, tone decoder 236 provides corresponding to the voice data that offers audio coder 216 at first.
In a traditional VOD architecture, server and server network communicate by hierarchically structured the client-server pattern and the client computer of standard.For example, a client computer sends the request to a data file (for example video data file) to a server.For this request of customer in response machine, server sends institute's request msg file to client computer.In the client-server pattern of standard, one or more server can be finished the request to a data file of a client computer.Client computer can have any data file that receives is stored in locally and is provided with the ability that use the back in the non-volatile internal memory.The client-server pattern of standard requires the communications infrastructure of a two-way.Current, the two-way communicating requirement is built new infrastructure, because existing cable only can provide one tunnel communication.The example of the two-way communications infrastructure is hybrid fiber/ coax, HFC (HFC) or all fiber basis facilities.It is extremely expensive replacing existing cable, and final service may be that most of users are beyond one's means.
What prior art Fig. 3 described is the functional structure chart of the simplification of a VOD system 300.The core of this system is a video server 310, video server 310 is routed to distributed basis facility 314 to the digital movie that resides in the film storage system 312, distributed basis facility 314, for example telephone network and a cable TV (CATV) system, can use optical fiber, and adopt Asynchronous Transfer Mode (ATM) host-host protocol.Distributed basis facility 314 is transmitted in each family to film according to the routing iinformation that video server 310 is provided.
VOD system 300 also comprises a plurality of VODSTB 304 that handle VOD in VOD system 300 that are applicable to.Each STB 304 receives and deciphers a digital movie, and it is converted to one is used for the signal play on a television set or monitor.In addition, distributed basis facility 314 also comprises one " back channel ", and by this back channel, the beholder can sort and controls the broadcast of digital movie.Back channel is routed to video server 310 to the order from VOD STD 304 backward by distributed network 314.The main function of video server 310 is to give the beholder of the request of sending the digital video frequency flow of compression from their memory cell route.
Above discussion explanation has scheme both not provide VOD that digital broadcasting also is provided in a single system earlier.On the contrary, there is scheme to be subjected to the restriction of a plurality of factors earlier.A main limiting factor is that prior art uses mpeg 2 transport stream with stream mode.In addition, in order to operate prior art VOD system requirements bidirectional communication link.People wish the system that can provide such: almost can be provided in numerous client computer to digital broadcasting and the service of request formula on any transmission medium, and need not to replace existing infrastructure.What also need is a kind of method of watching option (for example multiplex broadcasting) and virtual VCR time shift characteristic (for example suspending, write down, freeze the picture of a broadcasting) and unsettled and poor the Internet flows broadcasting-quality can not occur that provides to the beholder.People also wish to provide this function by a unidirectional communications link.
Summary of the invention
The present invention has told about the method and system that is used to provide digital service (for example VOD, digital broadcasting, from the time shifting of any broadcast medium and the universal set-top box (STB) (STB) that can handle the digital service of all these kinds).
First embodiment of the present invention has told about a general purpose public address system that digital service can be provided by a unidirectional communications link on a plurality of channels.These channels are applicable to provides one of VOD or digital broadcasting.Other channel can be used for other purpose, so the present invention does not get rid of more service.
General purpose public address system comprises the digital broadcasting circuit that is applicable at one first channel digital broadcast data of general purpose public address system.This digital broadcasting circuit comprises a plurality of digital broadcast datas source, data, a plurality of digital data coding device, first data that these digital broadcast data sources provide preparation to broadcast on first channel merge equipment, first channel server, and one first channel upconverter.Each digital data coding device is coupled in corresponding, a unique data source, and operationally the digital coding that is received is become a digital program stream format.First data merge device coupled in the digital data coding device, but and the data that received by the digital program stream format of operation handlebar be merged into the first digital stream data that merge.
One first channel server is coupled in data and merges equipment, and operationally generates the intermediate-freuqncy signal of one first modulation according to the first digital stream data that merge.First up-conversion device is coupled in first channel server, and operationally the intermediate-freuqncy signal of first modulation is converted to one first radiofrequency signal.
General purpose public address system also comprises a combiner amplifier, and this combiner amplifier is coupled in first channel circuit.The combiner amplifier operationally amplifies, regulates and makes up the radiofrequency signal that is received, for example, and first radiofrequency signal.The output of combiner amplifier is applicable to crosses over a plurality of channels that an one-way communication media provides general purpose public address system.
According to another embodiment of the invention, general purpose public address system also is applicable to by a second channel provides data-on-demand.This realizes by following parts: center Control Server, storage prepare press the central storage device of the data that data-on-demand supplies, and at the data-on-demand circuit of second channel.The data-on-demand circuit comprises a second channel server that has a second channel server CPU, local internal memory, a modulator and a network interface.The second channel server operationally generates one second intermediate-freuqncy signal of modulating according to the numerical data that is stored in the local internal memory.
The data-on-demand circuit also comprises a second channel up-conversion device that is coupled in the second channel server, and second up-conversion device operationally converts the intermediate-freuqncy signal of second modulation to be provided in the combiner amplifier one second radiofrequency signal.
The center Control Server can be used for selecting second channel and is that the data file of transmitting on the central storage device that is stored on the second channel is calculated a transmission (delivery) matrix.The second center Control Server also operationally provides the off line of the data file information on second Control Server is added, deleted and revises.
One aspect of the present invention has been told about a computer implemented universal digital broadcast method, and this universal digital broadcast method is applicable to transmission of digital broadcast data in the channel in a digit broadcasting system, transmits data-on-demand in one other channel.This method comprises provides one first channel server, and this first channel server is applicable to the transmission by the digital broadcast data of one first channel.And comprise a second channel server be provided that this second channel server is applicable to the transmission by the data-on-demand of a second channel.Before data broadcasting, this method has also been told about and has been one first channel server of data-on-demand transmission of Information preparation; (electronic program guides comprises the indication information of " first channel comprises digital broadcast data " to transmit an electronic program guides.Electronic program guides also comprises the indication information of " second channel comprises request formula numerical data "); And combination and transmission are from the data of first channel and second channel.
Description of drawings
Illustrated to prior art Fig. 1 visualization the video data packets after the compression has been become a bag stream and a grouping process that transmits bag stream.
Prior art Fig. 2 is a structure chart that meets the system of Moving Picture Experts Group-2.
Prior art Fig. 3 is the functional structure chart of the simplification of a VOD system.
Fig. 4 is the structure chart of the digital broadcasting server of first embodiment according to the invention.
Fig. 5 is the structure chart of the VOD server of another embodiment according to the invention.
Fig. 6 is the structure chart of the general digital data server of another embodiment according to the invention.
Fig. 7 is the structure chart of the channel server of first embodiment according to the invention, and this channel server is applicable to transmission VOD data.
Fig. 8 is the structure chart of hardware architecture of the universal STB of another embodiment according to the invention.
Embodiment
Hereinafter with reference to accompanying drawing each embodiment is described in detail, accompanying drawing is the part of each embodiment.The embodiment that can be put into practice the present invention has been described these description of drawings.To the detailed description of these embodiment, can be so that those people that are familiar with this technology can put into practice the present invention.People can realize: also can use other embodiment, and under the situation that does not deviate from spirit of the present invention and scope, can structure, logic and electric aspect to change of the present invention and the modification of carrying out others.
The present invention has told about the method and system that is used to provide digital service (for example VOD, digital broadcasting and the universal set-top box (STB) (STB) that can handle the digital service of all these kinds).A plurality of hardware architectures and complementary data transmission method can be implemented such electrons transmitted program guide by one, identify different services.Universal STB of the present invention can be distinguished different services according to the information that is received in the electronic program guides, and has used the good hardware architecture that comprises a big buffer to be designed.The present invention also provides and has watched option, and for example multiplex broadcasting and virtual VCR time shift characteristic comprise time-out, write down, freeze the picture of a broadcasting, and unsettled and poor the Internet flows broadcasting-quality can not occur.In addition, these diversified services are also provided by a unidirectional communications link.
Discussion to broadcasting server will be from Fig. 4, and Fig. 4 has illustrated a digital broadcast service device that is suitable for providing digital broadcasting layout according to the invention.Next turn to Fig. 5, description is met a VOD server of an alternative embodiment of the invention.In Fig. 6, will the general digital server that multi-channel digital broadcasting and VOD are provided be described.Next, with reference to Fig. 7, description is applicable to a channel server of VOD transmission.
Directly turn to Fig. 4, a single channel of a digital broadcasting server 400 comprises that partly a plurality of video source 402, a plurality of digital data coding device 404, data merge equipment 408, channel server 410, a upconverter 412 and a combiner amplifier 414.Video source 402 can provide analog video data (for example, from a camera, VCR, TV programme) or digital of digital video data (for example mpeg file, mpeg transport stream).Usually each digital data coding device 404 is a mpeg encoder/transducer hardware devices, although other coding standard is available, coding can be realized by software.
The output of the mpeg program stream of digital data coding device 404 is provided in data merges equipment 408, be used to generate the data flow 416 of a combination.Data merge equipment 408 can get any form that is suitable for concrete application, and for example, if 404 outputs of digital data coding device and channel server 410 inputs are Ethernet compatibilities, data merging equipment 408 can be an ethernet switch hub so.Equally, data merge equipment 408 and can be realized in a computer system that has a suitable interface.
In the embodiments of the invention of being recommended, each data merges equipment 408 and is implemented in the single equipment 406 with relevant channel server 410, but these equipment can be used as separate equipment made.
Fig. 5 has illustrated the architecture of the VOD server 450 of an embodiment according to the invention.VOD server 450 comprises a plurality of channel servers 411, a plurality of upconverter 412 (each is corresponding to a channel server 411), combiner amplifier 414, a center Control Server 502 and a central memory 504 (as described, by 506 couplings of a data/address bus).To and then describe as following,, start real-time Transmission in case the off-line operation of center Control Server 502 control channel servers 411 and channel server 411 are ready to.Central memory 504 is pressed the number format storing data files.
In an exemplary embodiment, being stored in data file in the central memory 504 can be by the network interface (for example Ethernet connection) of a standard, by the computer of any mandate, for example is connected in the in addition access of center Control Server 502 of network.Channel server 411 can provide according to the instruction from center Control Server 502 from central memory 504 data retrieved files.Scheduling at the transmission of the retrieval of the numerical data of VOD and numerical data is that " off line " carried out, so that the good real-time Data Transmission of each channel server 411 adequate preparation.Each channel server 411 tells center Control Server 502 when for providing VOD to get ready, and promptly when center Control Server 502 can transmit by control channel server 411 beginning VOD.
In the embodiment of a recommendation, center Control Server 502 comprises a graphical user interface (not shown in the diagram), so that the service provider can be by the transmission of drag operation data dispatching.In addition, confirm and control channel server 410 starts or stops by matrix according to transmitting for center Control Server 502.By name " being used to broadcast system that the System and method for of video-on-demand service is provided " of Khoi Hoang, application in Mays 31 in 2000, patent application serial numbers is 09/584, in 832 the patent application, told about the system and method that is used to provide unidirectional VOD broadcasting matrix.Now this patent is incorporated into herein, with for referencial use.
Center Control Server 502 is automatically selected a channel, and the data file calculating transmission matrix (matrices) for transmitting in selected channel.Center Control Server 502 provide to the off line of data fileinfo (for example duration, category, graduation, and concise and to the point the description) add, deletion and revising.In addition, center Control Server 502 also is stored in data file and database control centre memory 504 in the central memory 504 by modification.
Each channel server 411 is distributed to a channel, and it is coupled in a upconverter 412.The output of each channel server 411 is intermediate frequency (IF) signals of a quadrature amplitude modulation (qam) modulation, and this signal has a suitable frequency at corresponding upconverter 412.The IF signal of QAM modulation depends on institute's accepted standard.In the U.S., current institute accepted standard is " data standard on the cable system interface (DOCSIS) " standard, the IF frequency of the about 43.75MHz of this standard-required.Hereinafter with reference to Fig. 7, the channel server 411 of a recommendation is described in more detail.
The output of upconverter 412 is applied to combiner/amplifier 414.Combiner/amplifier 414 amplifies, regulates, makes up the RF signal that is received, and then signal is outputed to a transmission medium.
Fig. 6 has illustrated the generic broadcasted server 500 of an of embodiment according to the invention.Generic broadcasted server 500 both provided the request formula in a single broadcasting server, numerical data broadcasting also is provided.Generic broadcasted server 500 comprises a plurality of video source 402, a plurality of digital data coding device 404, a plurality of digital broadcast equipment 406, (each has data and merges equipment 408 and a channel server 410), a plurality of channel server 411, a plurality of upconverter 412, combiner amplifier 414, a center Control Server 502 and a central memory 504 (by 506 couplings of a data/address bus), as shown in FIG..
Fig. 7 has illustrated the exemplary channel server 411 of an of embodiment according to the invention.Channel server 411 comprises a CPU 550, QAM modulator 552, a local internal memory 554 and a network interface 556.Controller server 602 is the whole operation of control channel server 411 in the following way: CPU550 divides into piece (further being divided into sub-piece and packet) to data file by indication; In the situation of data-on-demand service,, select to be used for data block transmitted according to a transmission matrix that provides by center Control Server 502; The selected data of encoding; Data behind the compressed encoding; Then the data of being compressed are sent to QAM modulator 552.
QAM modulator 552 connects by a bus (being PCI, cpu local bus) or Ethernet accepts the data that preparation is transmitted.In an exemplary embodiment, QAM modulator 552 can comprise a downstream QAM modulator, a upstream quadrature amplitude modulation/Quadrature Phase Shift Keying (QAM/QPSK) demodulator (have forward error correction decoder, and a upstream tuner) of bursting.The output of QAM modulator 552 is the IF signals that can directly put on upconverter 412.
Network interface 556 is connected in other channel server 411 and center Control Server 502 to channel server 411, to carry out scheduling and control command from center Control Server 502, turn back to center Control Server 502 report condition and to receive data file from central memory 504.According to before from the instruction of center Control Server 502 the data file being handled, can be stored in any data file that receives from central memory 504 the local internal memory 554 of channel server 411.In an exemplary embodiment, channel server 411 can send one or more DOD data flow, these DOD data flow depend on a compression standard/bit rate of bandwidth (for example, 66.5 or 8MHz), QAM modulator (for example QAM 64 or QAM 256) and the DOD data flow (for example MPEG-1 or MPEG-2) of a wire message way.
Can be in an analog channel that depends on channel width, modulation scheme and desired program bit rate (MPEG) a plurality of digital programs of broadcasting.For example, in the CATV channel of a 6MHz who uses QAM64.The maximum throughput of channel is 27Mb/s.If desired bit rate is 2Mb/s, can on an analog channel, send 13 digital programs so in theory.Because the expense of agreement, actual program number will be lacked.
Fig. 8 has illustrated the universal STB 600 of an embodiment according to the invention.STB 600 comprises a qam demodulator 602, CPU 604, local internal memory 608, decoder that has video and an audio coding ability 612, figure laminating module 614, user interface 618, communication link 620, a fast data bus 622 that is coupled in these equipment, as illustrated among the figure.The whole operation of CPU 602 control universal STB 600, so as to respond that the request of a client computer is selected data, deciphered selected data, the data deciphered of decompressing, again the data deciphered of assembling, the storage of being deciphered in local internal memory 608 or buffer memory 610, and the data of being stored are sent to decoder 612.In an exemplary embodiment, local internal memory 608 comprises non-volatile internal memory (for example hard drives), and buffer memory 610 comprises easy mistake internal memory.
In first embodiment, qam demodulator 602 comprises reflector and receiver module and following one or more parts: dedicated encrypted/deciphering module, forward error correction decoder/encoder, tuner controller, downstream and upstream process device and CPU and memory i/f circuit.Qam demodulator 602 receives the signal of IF signal, sample and the rectification preparation restore data of modulation.
In an exemplary embodiment, when allowing access, decoder 612 at least one data block of decoding are to convert data block to the image that can play on an output screen.Decoder 612 is supported the order of ordering client computer from, for example plays, stops, stepping, reviewing, advancing etc.Decoder 612 offers output equipment 624 to the data after deciphering, and uses for client computer.Output equipment 624 can be any suitable device, for example, and TV, computer, any appropriate display monitor, a VCR etc.
For example, mix or picture-in-picture capability by α is provided, figure laminating module 614 has strengthened the quality of the figure of being play.In an exemplary embodiment, can during the game play mode, for example, when the service provider uses system according to the invention that request formula game services is provided, can be used for figure to figure laminating module 614 and quicken.
In an exemplary embodiment, although data file is broadcasted towards all cable subscribers, only those DOD subscribers that have the STB 600 of a compatibility can decipher and enjoy the data-on-demand service.In first exemplary embodiment, can obtain the permission of obtaining data file by a smart card system in the user interface 618 in the request mode.Smart card can or be supplemented with money on by the vending machine that the service provider settled again in the shop of a locality.In another exemplary embodiment, fixed fee system provides unconfined access to all data files that can get to the subscriber.
In the embodiment that is recommended, the data-on-demand interaction characteristic allows a client computer to select a data file that can get at any time.Client computer during by next options button and selected data file begin to play the time between time difference call the response time.When distributing more resources (for example bandwidth, server-capabilities) to go to provide the DOD service, the response time will shorten.In an exemplary embodiment, can determine the response time according to resource allocation and to the appraisal of desired services quality.
Above example has illustrated exemplary embodiment more of the present invention, and those people that are familiar with this technology will realize: can produce other embodiment according to these embodiment, and can make amendment and change these embodiment.Therefore, the present invention is not limited to these specific embodiments discussed above, but defined by following claim.
Claims (22)
1, general purpose public address system, this general purpose public address system provides digital service by a unidirectional communications link on a plurality of channels, and each above-mentioned channel provides one of VOD or digital broadcasting, and this general purpose public address system comprises:
At the first digital broadcasting circuit of one first channel of above-mentioned general purpose public address system, the first above-mentioned channel is a digital broadcast channel, and this first digital broadcasting circuit comprises:
A plurality of first digital broadcast data sources, the data that each first digital broadcast data source provides preparation to play on the first above-mentioned channel in the digital broadcasting mode;
A plurality of digital data coding devices, each digital data coding device is coupled in data source correspondence, unique in above-mentioned a plurality of data sources, and each above-mentioned digital data coding device operationally becomes a digital program stream format to the digital coding that is received;
First data merge equipment, and these first data merge device coupled in above-mentioned a plurality of digital data coding devices, and these data merge equipment and operationally the data that receive by the digital program stream format are merged into the first digital stream data that merge;
First channel server, this first channel server is coupled in above-mentioned data and equipment, and this first channel server operationally generates the intermediate-freuqncy signal of one first modulation according to the first above-mentioned digital stream data that merge;
First up-conversion device, this up-conversion device are coupled in the first above-mentioned channel server, and this first up-conversion device operationally converts the intermediate-freuqncy signal of the first above-mentioned modulation to one first radiofrequency signal; And
A combiner amplifier, this combiner amplifier is coupled in the first above-mentioned channel circuit, this combiner amplifier operationally amplifies, regulates and makes up the radiofrequency signal that is received, and the output of this combiner amplifier is applicable to that crossing over an one-way communication media transmits above-mentioned a plurality of channels;
This general purpose public address system also comprises:
A center Control Server;
The central storage device of the data of data-on-demand supply is pressed in a storage preparation;
At the first data-on-demand circuit of a second channel of above-mentioned general purpose public address system, above-mentioned second channel is a data-on-demand channel, and this first data-on-demand circuit comprises:
The second channel server, this second channel server has a second channel server CPU, local internal memory, a modulator and a network interface, and this second channel server operationally generates one second intermediate-freuqncy signal of modulating according to the numerical data that is stored in the above-mentioned local internal memory; And
The second channel up-conversion device, this second channel up-conversion device is coupled in above-mentioned second channel server, and this second up-conversion device operationally converts the intermediate-freuqncy signal of the second above-mentioned modulation to second radiofrequency signal that offers above-mentioned combiner amplifier.
2, general purpose public address system as claimed in claim 1, wherein, at least one in above-mentioned a plurality of first digital broadcasting sources is analog video source.
3, general purpose public address system as claimed in claim 2, wherein, above-mentioned analog video source is an analog video camera.
4, general purpose public address system as claimed in claim 2, wherein, above-mentioned analog video source is an analog video boxlike video tape recorder.
5, general purpose public address system as claimed in claim 2, wherein, above-mentioned analog video source is a tv programme source.
6, general purpose public address system as claimed in claim 1, wherein, at least one in above-mentioned a plurality of first digital broadcasting sources is digital video source.
7, general purpose public address system as claimed in claim 6, wherein, above-mentioned digital video source is a mpeg data file.
8, general purpose public address system as claimed in claim 6, wherein, above-mentioned video source is a mpeg transport stream.
9, general purpose public address system as claimed in claim 1, wherein, at least one in above-mentioned a plurality of digital data coding devices is mpeg encoder.
10, general purpose public address system as claimed in claim 1 wherein, is configured to a single equipment to above-mentioned first data merging equipment and the first above-mentioned channel server.
11, general purpose public address system as claimed in claim 1, wherein, the first above-mentioned digital broadcasting circuit is a digital broadcast circuit in a plurality of digital broadcasting circuit, and as the part of above-mentioned a plurality of channels of above-mentioned general purpose public address system.
12, general purpose public address system as claimed in claim 1, wherein, above-mentioned center Control Server is operationally selected above-mentioned second channel, and for transmitting a transmission of the data file calculating matrix on the above-mentioned central storage device that is stored on the above-mentioned second channel.
13, general purpose public address system as claimed in claim 12, wherein, above-mentioned center Control Server also operationally provides the off line of the data file information on above-mentioned second channel server is added, deleted and revises.
14, general purpose public address system as claimed in claim 1, wherein, the above-mentioned file of center Control Server managed storage on above-mentioned central storage device.
15, general purpose public address system as claimed in claim 1, wherein, the VOD data are one-way transmissions.
16, general purpose public address system as claimed in claim 15 wherein, is configured to a single equipment to above-mentioned first data merging equipment and the first above-mentioned channel server.
17, general purpose public address system as claimed in claim 17, wherein, the first above-mentioned digital broadcasting circuit is in above-mentioned a plurality of digital broadcasting circuit, and is a part that is used for a plurality of channels of above-mentioned general purpose public address system.
18, general purpose public address system as claimed in claim 15, wherein, above-mentioned center Control Server is operationally selected above-mentioned second channel, and for transmitting a transmission of the data file calculating matrix on the above-mentioned central storage device that is stored on the above-mentioned second channel.
19, general purpose public address system as claimed in claim 18, wherein, above-mentioned center Control Server also operationally provides the off line of the data file information on the second above-mentioned Control Server is added, deleted and revises.
20, general purpose public address system as claimed in claim 15, wherein, the above-mentioned file of center Control Server managed storage on above-mentioned central storage device.
21, general purpose public address system, this general purpose public address system provides digital service by a unidirectional communications link on a plurality of channels, and each above-mentioned channel provides one of VOD or digital broadcasting, and this general purpose public address system comprises:
A plurality of digital broadcasting circuit, wherein each is used for a counterpart of a plurality of channels of described general purpose public address system, and each all is a digital broadcast channel, and each digital broadcasting circuit all can produce digital broadcast data on the channel of correspondence;
A center Control Server;
A central storage device, this central storage device storage prepares to press the data of data-on-demand supply;
Be used for a plurality of data-on-demand circuit of a counterpart of a plurality of channels of above-mentioned general purpose public address system, each above-mentioned data-on-demand circuit is used for generating data-on-demand on the channel of a correspondence; Each data-on-demand circuit comprises the channel server of a correspondence, this channel server has a channel server CPU, local internal memory, a modulator and a network interface, wherein above-mentioned center Control Server is operationally selected a concrete data-on-demand channel, and for one of the data file calculating of transmitting on the above-mentioned central storage device that is stored on the above-mentioned data-on-demand channel transmits matrix, and provide off line interpolation, deletion and modification to the data file information on the second above-mentioned Control Server.
22, computer implemented universal digital broadcast method, this method comprises following action:
One first channel server is provided, and this first channel server is adapted to pass through one first Channel Transmission digital broadcast data;
A second channel server is provided, and this second channel server is adapted to pass through a second channel transmission data-on-demand;
Transmit an electronic program guides, this electronic program guides comprises that the first above-mentioned channel of indication comprises the information of digital broadcast data, and this electronic program guides also indicates above-mentioned second channel to comprise data-on-demand; And
Combination and transmission are from the data of first above-mentioned channel and above-mentioned second channel;
Wherein data-on-demand broadcasting is finished with one way system.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/584,832 US6557030B1 (en) | 2000-05-31 | 2000-05-31 | Systems and methods for providing video-on-demand services for broadcasting systems |
| US09/584,832 | 2000-05-31 | ||
| US09/709,948 US6725267B1 (en) | 2000-05-31 | 2000-11-10 | Prefetched data in a digital broadcast system |
| US09/709,948 | 2000-11-10 | ||
| US09/841,792 | 2001-04-24 | ||
| US09/841,792 US20020023267A1 (en) | 2000-05-31 | 2001-04-24 | Universal digital broadcast system and methods |
Publications (2)
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| CN1366774A CN1366774A (en) | 2002-08-28 |
| CN1322757C true CN1322757C (en) | 2007-06-20 |
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| CNB018007562A Expired - Fee Related CN1322757C (en) | 2000-05-31 | 2001-04-24 | Universal digital broadcast system and methods |
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| CN (1) | CN1322757C (en) |
| AU (1) | AU2001253797A1 (en) |
| BR (1) | BR0111651A (en) |
| CA (1) | CA2406714A1 (en) |
| EA (1) | EA004380B1 (en) |
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| IL (1) | IL152763A0 (en) |
| MX (1) | MXPA02011839A (en) |
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| CN101222614B (en) * | 2008-01-11 | 2012-03-21 | 武汉烽火网络有限责任公司 | Centralized high-definition digital television providing method and system supporting multi-program source and coding mode |
| JP5511946B2 (en) * | 2010-05-18 | 2014-06-04 | 三菱電機株式会社 | Broadcast supplement schedule providing apparatus, broadcast supplement system, and broadcast supplement method |
| CN103078656A (en) * | 2013-02-04 | 2013-05-01 | 常州南京大学高新技术研究院 | 2.4G radio frequency sensor |
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- 2001-04-24 IL IL15276301A patent/IL152763A0/en unknown
- 2001-04-24 JP JP2001588246A patent/JP2004501557A/en not_active Withdrawn
- 2001-04-24 NZ NZ522101A patent/NZ522101A/en unknown
- 2001-04-24 CN CNB018007562A patent/CN1322757C/en not_active Expired - Fee Related
- 2001-04-24 MX MXPA02011839A patent/MXPA02011839A/en unknown
- 2001-04-24 EA EA200201287A patent/EA004380B1/en not_active IP Right Cessation
- 2001-04-24 BR BR0111651-7A patent/BR0111651A/en not_active IP Right Cessation
- 2001-04-24 CA CA002406714A patent/CA2406714A1/en not_active Abandoned
- 2001-04-24 AU AU2001253797A patent/AU2001253797A1/en not_active Abandoned
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- 2003-02-28 HK HK03101489.3A patent/HK1049420B/en not_active IP Right Cessation
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| US5557316A (en) * | 1990-09-28 | 1996-09-17 | Ictv, Inc. | System for distributing broadcast television services identically on a first bandwidth portion of a plurality of express trunks and interactive services over a second bandwidth portion of each express trunk on a subscriber demand basis |
| US5619249A (en) * | 1994-09-14 | 1997-04-08 | Time Warner Entertainment Company, L.P. | Telecasting service for providing video programs on demand with an interactive interface for facilitating viewer selection of video programs |
| US5915094A (en) * | 1994-12-06 | 1999-06-22 | International Business Machines Corporation | Disk access method for delivering multimedia and video information on demand over wide area networks |
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Also Published As
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| EA200201287A1 (en) | 2003-06-26 |
| NZ522101A (en) | 2003-06-30 |
| HK1049420B (en) | 2008-02-01 |
| CN1366774A (en) | 2002-08-28 |
| JP2004501557A (en) | 2004-01-15 |
| BR0111651A (en) | 2003-05-20 |
| EA004380B1 (en) | 2004-04-29 |
| HK1049420A1 (en) | 2003-05-09 |
| CA2406714A1 (en) | 2001-12-06 |
| MXPA02011839A (en) | 2003-12-11 |
| IL152763A0 (en) | 2003-06-24 |
| AU2001253797A1 (en) | 2001-12-11 |
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