CN1092586A - In the band of television system/outer data transmission method of band and equipment - Google Patents

Abstract

A kind of data transmission method of cable television system comprises the step through a plurality of signal conveys data, and a plurality of signals are data-signal outside being with interior audio frequency, the interior video of band and band.Data-signal transmits on channel scramble or that do not have scramble in the band.The transmission method of video data also comprises in band, selects definite row of vertical blanking interval to be used to be with interior video Data Transmission, leaves out definite equalizing pulse and insert video data in the band between the departure date of this selection.Having the compatible transaction form with the outer data-signal of band in several bands is convenient to decode and data storage procedure at the user terminal of cable television system.

Description

In the band of television system/outer data transmission method of band and equipment

The application is the U. S. application serial number 799,987 of 29 applications November in 1991; 800,002,800,241 and 800,836 continuation part.The present invention relates to the television system field, relate to specifically utilizing in the band and draw together message and order the signal allocation equipment of cable television system and the method and apparatus of terminal with the outer data-signal transfer data packets of band.

Cable, satellite and air broadcast and charged TV system generally all are called television system, have been known since the seventies, and it is included on the subcarrier of carrier signal or broadcast singal the transmission address data to terminal.Particularly in cable television system, data carrier is chosen in the multiplexed frequency spectrum transfer bandwidth outside (being with outer carrier wave) of television channel.For example the outer carrier wave of select tape is near FM wireless channel frequency band, as at 108.2MHz, and the addressable data for example to be frequency shift keying on the outer carrier wave of band modulate.Typically data comprise an address field and data or message field.When conforming to as the address of this address and it equipment pointed, then data field is received by this equipment.The data of data field can be ordered this equipment in some way, particularly, can comprise order data or operand, are sometimes referred to as transaction code and by other data of command operation.Some data fields are of overall importance, and can be received by all receiving equipments.Other data field is the set of terminal that is addressed to a selection uniquely, a terminal sites or a terminal that can have a plurality of terminals.

As time goes by, cable television system has become more complicated.Signal allocation equipment can comprise amplifier, and it can transmit address data control from the front-end processor (headend) of cable television system.Can automatically control by gain and equilibrium that this equipment provides by front-end processor.Similarly, branch equipment is by the addressable order control that comes from front-end processor, and branch equipment for example can comprise and forbidding, trap or other signal refusal equipment.Terminal equipment also can be by addressable order control, and this terminal equipment for example can comprise the anti-scramble equipment of signal.

Need bigger communication capacity to control several Type of equipment and the miscellaneous service that to control by front-end processor, this has promoted to require to send addressing by other device from front-end processor and even non-addressing data.An alternative system that has developed utilizes the sound carrier of following video carrier, comprises the wall scroll video channel together.For example, sound carrier can carry out amplitude modulation(PAM) with data, and it follows a channel.These data can not be address datas.The data that send on sound carrier for example can be used to the identifier as channel or program, the video of following with identification or the content of program.On the other hand, data can comprise that address data is with the outer transfer of data of the band of additional or alternative address data.The audio data transmission is sometimes referred to as the front-end processor controller by recording controller in the known band in this band, controls with a kind of method, so that system's control computer utilization band is interior and the outer transfer of data of band obtains advantage.For example, signal allocation or the important immediate command of terminal equipment are transmitted immediately, the data that require immediately that degree is lower are transmitting on the basis without band.United States Patent (USP) 5058160 is narrated such front-end processor controller and system particularly, quotes at this for reference.But TIB tone in band audio data rate can be slow and can be only near scanning frequency rate or per second 15734 bits.

Another problem of audio data transmission is to be also referred to as encoder by the TV signal scrambler generally only to insert the high-quality channel in the band of the sound carrier of process video channel.In other words, the data sink of terminal equipment must be tuned at the scramble channel, so that audio data transmission in the data receiver receiving belt.Narrated audio data receiver in the band of the cable television terminal that can show channel identification information in the US application serial No. 07/800002 of the not authorization of submitting on November 29th, 1991, quoted for reference here.

Along with what is called is followed the appearance of the screen display of the data that the certain tones road occurs, the channel program guide of viewing channel for example needs to increase the data passes ability of this channel relatively.For example, wish to be transferred to specific cable TV channel by remote control, make the program guide that shows the amusement in night on this channel, interval, substitute the programme content that occurs with program audio frequency or other audio contents in the time of one.Television terminal with programmable background audio-frequency and frequency is narrated in United States Patent (USP) 4991011, quotes for reference here.

In addition, the utmost point need provide new on cable television network and supplementary service.These business comprise TV, speech and data, and captions, teletext, fax, digital audio, video-game and computer software are installed.All these business needs increase widely utilizes available cable TV frequency spectrum.

Suggestion air broadcast program transmits captions in the delegation of vertical blanking interval now.Also be long-term requirement, the row of vertical blanking interval keeps as some test purposes.In addition, in Europe, provide teletext service more known times at some row of vertical blanking interval.Therefore, in the vertical blanking interval of the baseband video signal of television system in the conveyer belt video data generally public as some times.

Along with the requirement of the data passes ability that increases, require to keep compatible with the outer data passes scheme of band with existing band is interior, make the operator of cable television system need not to change the interior terminal equipment of their existing cable distribution, this is a very big capital investment.Therefore, in cable TV industry, still exist the problem that increases widely from the data throughput of front-end processor by signal allocation equipment.

The problem of known cable TV data transmission device and relevant problem have been solved by principle of the present invention, and the present invention has following purpose:

The objective of the invention is to discern and utilize the attachment device of the transfer of data of in the past bringing in.This attachment device can include but not limited to the vertical blanking interval part of sharp video image signal.

Another object of the present invention is to keep and existing signal allocation and terminal equipment compatibility.Therefore, the existing business of known cable television system and feature will be with known methods or are not had remarkable diverse ways to provide with a kind of with prior art at least, and this method requires considerable terminal change or replaces.

Another object of the present invention is to be used for attachment device new and transfer of data supplementary service.These new business can comprise the transmission of TV, audio frequency and video, and program channel guide and other business, some business have wherein been enumerated in the above.

Another object of the present invention is to make within the bounds of possibility that transmission plan is easy to decoding similarly in the outer and band of band, make the software memory capacity of terminal or signal allocation equipment reduce to minimum and the storage of the data that receive easy.For satisfying this purpose, the grouping that these data can similar length transmits, and this grouping comprises many even bytes M or even bytes N between 12 and 36 between 8 and 24.So simple transactions or message can comprise M or N byte, and more complicated transaction or message can comprise 2M to 8N byte long.Therefore depend on their length, transaction can be a several types, can be appointed as A the most simply as required, B, C, D, E ... or the like, but keep by packet parameters M and/or N and/or 2 common points of determining.Be transaction in case be formatted into, these data can be through audio frequency in any one band that provides, and video or the outer data channel of band transmit in the band.

Keep purpose of the present invention, be used for greatly increasing from front-end processor to signal allocation equipment with the outer transfer of data of band in the band or to the data throughput of terminal.To a certain extent, vertical blanking interval is not used to the business that requires as adding captions, and it is professional as the program channel guide to be used to transmit high data throughput, this guide requirement frequent with the renewal cycle.The data transfer rate of the order of magnitude of TV data rate is counted in suggestion through the known figure that is transmitted as per second 5.7 million ratios of vertical blanking interval.Be with outer affairs to handle and be used to upgrade terminal memory and control signal distributing equipment with known method.But, as mentioned above,, three kinds of forms of transfer of data have been proposed: audio frequency in the band, the common point of the data transmission scheme of arbitrary form that interior video of band and band are outer according to principle of the present invention.

According to principle of the present invention, for video data in the band, for example be provided at the pedestal level on selectable 70, the 80 or 100 IER level, so video data receiver data are the vertical blanking interval signal in half incision of selected pedestal level in the band.By the analog-and digital-circuit with interior video or vertical blanking interval data receiver, this circuit is determined the position of vertical blanking interval and the form of the data that hope occurs on given row.The audio data transmission can be used for being established to the ability of the given terminal equipment of decoding particular row in the outer or band of the band of addressing.For example, row 10-12 can be a kind of the form decoding, row 13-16 decodes with another kind of form, or the like till row 21, it is preserved for by adding captions (captions of second language can be provided according to another row of principle of the present invention).In alternative embodiment, look the topic data in the band and can be used for its recovery and identification.Therefore avoid requiring terminal to tend to receive data from predetermined row.In any embodiment, require to be sent to the caption signal of television receiver and other signal according to the present invention and will can't help signal allocation or terminal equipment decoding, perhaps disturbed on the contrary and can not receive by television receiver.

In a preferred embodiment, the row 7,8 of the vertical blanking interval of picture intelligence and 9 can be used to transmit the interior video data of band of for example descrambler control or new business.These work and are usually used in transmitting equalizing pulse after zigzag lock-out pulse shows vertical sync pulse.According to the present invention, the vision signal that video data will be removed input in the band that sends with certain equalizing pulse of message in the video data receiver in band with meet be not higher than 0 IRE signal in these capable requirements that is sent to television set.In addition, this receiver automatically substitutes any equalizing pulse of removing.

The form that is used for the interior video data of band of anti-scramble control for example can comprise the selection data that are used to select one of a plurality of anti-scramble modes, anti-scramble mode such as video are anti-phase, anti-phase synchronously, control on the level that changes suppresses synchronously, video line moves slowly, the sinusoidal wave inhibition or any other well-known scramble method.The anti-scramble control data of another kind of form comprises timing data, that is, and and when being beginning and when finishing a kind of specific anti-scramble form.For example, but usage flag in vertical blanking interval " beginning " and the anti-scramble mode window of regulation such as a lot of field, perhaps, in another embodiment, the beginning of the anti-scramble of particular form can be stipulated by a mark, and the end of the anti-scramble of this particular form is by another mark regulation.Here the further feature of being narrated of the present invention comprises and uses a field mark to represent very/the even field and the moment.Other application of video Data Transmission can be including, but not limited to above-mentioned business of enumerating such as program channel guide in the band, teletext, fax, telecommunications or the like.

7,8 and 9 all six equalizing pulses that occur all are removed if be expert at, and then can produce the equalizing pulse that this is removed according to terminal of the present invention, require them to be sent to television receiver.By removing all equalizing pulses, in the end begin after sawtooth lock-out pulse and in fact 200 milliseconds of data windows (in the video waveform of NTSC standard 3 row * 63.5 milliseconds/OK) are provided to provide 10 first full duration horizontal pulse of being expert at.In another embodiment, appear at the synchronous row 7,8 of horizontal pulse and three equalizing pulses of 9 and be not removed; Three equalizing pulses that only appear between these row are removed.Even in this embodiment, the data available window only reduces about 10 milliseconds.

Preferably, be used to in every row of vertical blanking interval of video Data Transmission comprise that at least 50 milliseconds data window is used to send 25 4 bit bytes.These data for example can comprise that the differentiation of the byte of one millisecond of duration cuts level with the data that bipolarity Data Detection and evaluation are provided.

Therefore, datin is changed normal TV synchronousing signal in the band according to the present invention, and comprises a part or a cable TV modulator of TV scrambler easily, perhaps comprises an integrated unit that separates.Datin is at first submitted in above-mentioned U. S. application preface on November 29th, 07/800002,1991 in the band, is used for providing on the channel of no scramble in the band audio data to transmit and narrates.According to principle of the present invention, datin can provide video data insertion in the interior audio frequency of band or interior audio frequency of band or the band in the band of non-prime channel; So, the band inner receiver do not need be tuned to have only video data in the television channel receiving belt of scramble.

Be connected to the cable TV distributing equipment through an illegal terminal, the equipment of assembling regeneration equalizing pulse will be in conveyer belt received signal on any channel of video data, whether no matter be scramble, this is not according to NTSC broadcast singal standard.Reduce the picture intelligence quality wittingly and can cause some vertical distortions at some television receivers.This is an advantage in stoping piracy of signals.

In addition, according to principle of the present invention, new business is to transmit on the vertical blanking interval of vision signal, and known business is to provide at sound carrier (audio frequency in the band) or through data carrier outside being with.The operator of cable TV can utilize or the transmission of programming data business, in a word, utilize automatically and be scheduled to, how they are by carrying out with the outer transfer of data of band in the band of system's control computer and front controller process selection sound carrier and base band video blanking interval form.

Following narration by accompanying drawing the present invention may be better understood the principle of these and other.

Fig. 1 is a block diagram of introducing the cable television system of the principle of the invention, comprises a front end, signal allocation equipment and subscriber terminal equipment.

Fig. 2 is the block diagram of TV signal scrambler shown in Figure 1.

Fig. 3 is the block diagram of video data inserter in the band, and it can comprise the television channel data inserter of the front end of the part of scrambler or Fig. 1.

Fig. 4 introduces in the band of Fig. 1 of the principle of the invention/block diagram of the outer data terminal equipment of band, represented to be used for the demodulation of interior audio frequency of receiving belt and video data and to remove scramble circuit 404, with data and control circuit 402, be used for the interior audio frequency of band and the video data of outer data of receiving belt and decoding.

Fig. 4 a and 4b be the expression demodulation with process of removing scramble circuit 404 and in more detail expression be used to recover with interior video data, the block diagram of data among Fig. 4 and control circuit 402.

Fig. 4 c be represent in more detail to be used to recover with in audio data, the demodulation among Fig. 4 with remove the block diagram of a process of scramble circuit 404.

Fig. 5 is illustrated in during the vertical blanking interval of TV image signal the television waveform of video data in the transport tape; Fig. 5 a represents the TV signal of standard; Fig. 5 b is by example 7,8 and 9 equalizing pulses that are removed of representing to be expert at; And Fig. 5 c represents to insert 7,8 and 9 the data of being expert at; With

The television waveform that uses with Fig. 4 a and 4b in the video data in Fig. 6 is illustrated in and recovers to be with.

Fig. 7 is a table, be illustrated in three signals: transmit sub data transmission prescription case data, suggestion on the signal of audio data and the outer data of band in video data, the band in the band, the packet scheme is compatible as far as possible to decode and data storage efficiency promoting.

Referring now to Fig. 1,, represented to receive a front end 100 of signal distributing equipment 165, signal allocation equipment is used for the terminal equipment 150 from front end 100 distributing signals to cable television system.When representing and having narrated cable television system, principles more of the present invention similarly can be applicable to satellite, air broadcast, charged TV system or other television system well-known in the art.Front end 100 comprises from signal combiner 106 and distributing equipment 165 and all unit more than the dotted line that end equipment 150 separates.Front end 100 equipment do not need all to be placed on the three unities, and can be placed on the several places by the ground point control at control computer 102 places of system at least.The front end 100 of cable television system receives other program content source of a plurality of TV channel signal, can comprise video-game or digital audio, even as the telecommunication signal of the input of modulator, signal processor and front end.The input video channel of delivering to modulator 105a-105g is represented as " audio frequency and video are gone into ".Also show the many connections between each modulator 105a-105g and the scrambler 104a-104f datin 107a etc.With " audio frequency ", " video " represented, base band " BB " mark and connecting line associated in Fig. 1.The receiver that receives miscellaneous service is not shown, but can comprise that satellite-signal receives video broadcasting reception or telecommunication receiver.Front end formats and sends miscellaneous service so that be delivered to user locations 150 at available cable TV frequency spectrum then.Professional transmit through cable 170, cable 170 can be coaxial or optical fiber, and it comprises the part of signal allocation equipment 165, with for example be connected signal combiner 106 to equipment 175 and connection device 175 to terminal equipment 155a, b, c or branch 180.Amplifier, equalizer, coupler, branch and transmission signal are generally represented with equipment 175 near other signal allocation equipment the user house 150.In signal allocation square frame 165, also represented branch 180, referred generally to signal allocation equipment, can comprise for example signal refusal equipment such as addressable branch, trap or forbid equipment near the known type in user house 150.Arbitrary form of signal allocation equipment 175,180 can be transmitted outside the band of addressable transmitter 140 of associating in the past and hold 100 to carry out the far-end addressing.Signal allocation equipment 165 generally is not used in transfer of data in the receiving belt.Therefore, all communication, no matter their whether be addressing communication all pass through addressable bands outward transmitter 140 send to signal allocation equipment 165.

At front end 100, a charging computer 100 and a system manage ment computer 120 are arranged generally.Charging computer 100 comprises a customer data base and according to the grade of service with by watching number of times paying and pulsed by watching number of times paying price to produce the moon bill of this system user, charging computer 110 can comprise individual well known in the art or other data handling machine.Known charging computer system comprises the product of cable data.

System's control computer 120 interfaces are to charging computer 110.System control computer 120 can be based on Intel 486 microprocessors of machine, as 200 Mbytes hard-drive are housed, at the UNIX(R of the RAM with 32 Mbytes) the IBM model 90 moved down of the control of operating system or another data handling machine known in the art.These computers generally are used to produce transaction so that be delivered to signal allocation equipment 165 or user locations 150.Charging computer 110 relates to transmission especially by the permission of watching number of times paying and high-quality business.This permission is controlled computer 120 by system and is translated as the transfer of data of being with addressing in outer or the band so that permit the transmission of high-quality business according to known procedures.The transaction that receives system's control computer 120 also formats as the permission transaction from charging computer 110 and transmits transaction to front controller 130 and addressable transmitter (ATX) 140.

System manage ment computer 120 can be communicated by letter with ATX 140 through the communication route by front controller 130 equally.Front controller 130 is not that audio frequency is exactly the control of video specified data transmission in the band in the band through device in the band.Be with outer data to be formatd suitably and be directly delivered to that addressable data send out machine 140 several or through front controller 130, it passes through from above-mentioned communication link (as the words of using) as data.Addressable data transmitter 140 is for example modulated this data at the outer carrier wave of band on as the 108.2MHz that is being used to transmit with frequency shift keying or other data modulation technique.

Data are to one of a plurality of scrambler 104a-f in front controller 130 conveyer belts, perhaps through the scrambler of a selection or directly arrive from one or one group of a plurality of datin 107a selections, or the like.Scrambler 104a-f work is with data in modulation is with at base band video or on the audio carrier data channel.Scrambler and modulator 105a-105f or do not have the interfaces such as channel modulator 105g of scramble.The as many scrambler 104 of high-quality scramble channel with system can be arranged.In addition, can on non-prime channel, use a scrambler to be used for the insertion of data.The high-quality channel of television channel of charge operation that is intended for transmitting some high-qualitys is as the transmission that is exclusively used in some programs such as the channel in family's boxing ring (Home Box office) or Disney, perhaps plays high-quality programs as by the channel of watching the secondary bothersome part of program number of times in some times at least.

The many different scramble scheme that is used for the scrambled television signal is known.The details of special scramble operation is not described herein, but will understand that importantly many different systems may be separately or are used together with signal of scramble.The scramble of each such form is called a scramble mode here.

Scrambler comprises video channel data modulator in the band, is used for inserting modulating data on data and the sound carrier signal at given channel on the selection row of the vertical blanking interval of base band video picture intelligence, will further narrate in conjunction with the discussion of Fig. 2.

In an alternative embodiment (not shown), addressable reflector 140 can be connected to front controller 130 or one or more scrambler 104a-f or one or more datin 107a or the like.In this embodiment, front controller 130 for example can determine that the formation of data transactions in the band exported is so big, so that the outer data transactions of band is a transaction mode more easily.Therefore, front controller 130 can send one or more foregone conclusions affair processing by signaling ATX 140.Be sent out on such data path (not shown) with data, make these data to send immediately through the outer transmitter 140 of a band according to the transaction form pre-formatting of Fig. 7.In addition, scrambler or datin can run into similar whole team row or other situation, are urgent in this situation data transactions, and transfer of data is impossible in the band, so the outer data transmitter of signaling band.According to principle of the present invention, data transactions is a preformatting, and is described in detail below through the transmittability of ATX 140 according to Fig. 7.The data path that sends the data transactions of preformatting from each scrambler or datin does not draw to avoid making Fig. 1 confusion.

According to principle of the present invention, datin 107a or other datin can be controlled computer 120 by system and select through the addressing life life of front controllers 140, audio frequency or bring video data in the channel band of no scramble.As long as the user be tuned on the selected non-prime channel, on non-prime channel, can carry out Data Receiving.The channel of no scramble (or scramble) can be chosen as idle channel, and terminal 150 addressable ground are tuning by order when not using.As long as datin is data in sending band, not between the operating period this terminal with receiving belt in audio frequency or be with in video data.

Another method of transfer of data is to utilize the video channel of an other non-special use to carry out transfer of data.Do not send image or sound; Therefore, the wide channel of whole 4.5MHz is used for transfer of data.This another method is not shown, but can be to video in the band of narration here, and audio frequency and the outer data-signal of band increase a further method of the data throughput of incoming terminal 300 in the band.In Fig. 2, there is a data transmitter (not shown) to be connected to the transfer of data that system's control computer 120 is used for the video channel of non-special use.Simply referring to Fig. 4, beyond being used to receive the reversible transducer and the data receipts machine of band of tuning channel, in this system, have the 3rd data receiver (not shown) regularly be tuned to the fixed non-dedicated video channel of frequency.

Control computer 120 also generation systems of system set up parameter, as the channel (these channels of system are scrambles) of scramble.120 configurations of system control computer offer user's channel tuning frequency and are controlled at demonstration on the screen, as narrating in US application serial No. 07/800002.System control be responsible for for computer controlled mouthful collecting and send rightly leave system's control computer 120 data to addressable data transmitter 140 and front controller 130, send the outer data of band to addressable data transmitter 140 and send that data arrive front controller 130 in the band.

Known subscriber terminal equipment may be two types, is respectively in the band and outside the band, is expressed as 155a and 155b.An example that only has the outer terminal of known addressable band that audio data recovers in the non-addressing band is the cable television terminal of the model 8580 of science Atlanta company.An example with interior audion terminal of audio data addressable band that recover, known in addressable band is the cable television terminal of science Atlanta company model 8600.

According to principle of the present invention, video and is represented with 155c with audio frequency be with outer data in the terminal receiving belt of the 3rd class.Terminal 155c will be discussed in detail in conjunction with the discussion of Fig. 4.In addition, according to the present invention, the embodiment (not shown) of alternative subscriber terminal equipment comprises only having to be with interior video data recovery or the interior video of band and to be with the cable television terminal of the combination of outer data recovery.

Addressable transmitter 140 sends data to user's terminal 155b outside the band through special-purpose FM data channel as 108.2 million red data channels in the cable TV distribution system, outside the assemblage zone/and data user's terminal 155c or addressable distributing equipment 165 in being with.This channel claims that data carrier is arranged, and is used to send predetermined addressable order to specific user terminal 155b or 155c or addressable distributing equipment 165, and is perhaps predetermined to user terminal 155b specific in the system or the global command of 155c.User terminal 155b or 155c or have other terminal that the outer data of band recover and comprise a receiver, it listens attentively to the order that develops through this data channel.Unlike transaction in the band of narrating below, be with outer user's terminal 155b or 155c to receive data through this channel, no matter this user terminal be tuned to any bar channel.

In addition, Ren Xuan terminal equipment 160 can be provided for forbidding of business device or other signal refusal form.These can be on the outer data carrier of band through branch 180 receive the communication of addressing and through cable distributing equipment 165 on the radio frequency return path or process telephone line return data.Except expression has the ability of the present invention of this equipment, will not be described in detail this equipment, this equipment can coexist in identical cable television system.

Terminal 155a or other terminal such as user terminal 155c can be through the communications of audio data transmission reception addressing in the band in the band according to the present invention.If in the band terminal 155a be tuned to the channel or the non-prime channel of scramble (high-quality), it typically receives audio data transmission in this band, its relevant modulator or signal processor (not shown) is to be controlled by datin 107a.But, typically, as above to be introduced, datin does not offer each non-prime channel.The non-prime channel that provides in typical, big cable system can become hundred ground counting.The cable operator hundreds of data inserter 107a are provided so that no matter be tuned to the non-prime channel of any bar, receiver terminal equipment 155a can recover to be with interior audio frequency number, this is impossible.

Therefore, suggestion provides terminal equipment such as terminal equipment 155c according to the present invention, and it can be through outer data carrier of band and the communication that alternately receives addressing through audio frequency transmission in the band.Also video data in the receiving belt of terminal 155c as mentioned above.

Front controller 130 is connected to system's control computer transaction that system control computer 120 and form be used for scrambler 104a-104f and handles.Represent six scramblers, but typically had the anti-stop signal of the same outer scrambler that provides with the high-quality channel illegally to usurp.The transaction that front controller 130 storages are all also can be carried out continuous update.Do not have the interior data transactions of band of terminal 155a in the band owing to there is tuning regularly data channel to be used to, proposed to send consistently, repeatedly and effectively the requirement of this information bank.Therefore, flow to all information datas of user terminal 155a in the band be subjected to in the uncertain availability of data path of user terminal 155a.

On the other hand, as described above not between the operating period, user terminal 155a may not have be tuned to scramble channel or have the non-prime channel of datin.Any this not between the operating period, seek ground and transaction no addressing with receiving.For example, the order that sends addressing before not between the operating period notify this terminal be tuned to without channel.When the user turn-offed their terminal, the channel that this terminal is automatically watched from this user changed to no channel.Terminal can be stored previous tuning channel in memory, just turn back to that channel as long as the user connects their terminal again.

But, becoming complicated in order further to make thing, some information are in real time critical, that is, it may be relevant with present afoot incident, perhaps can be to keep or service charging critical.For example, do not want to be transferred to the program guide of last hour entertainment.Though the in fact less time of out of Memory is critical, can be suitable value.Some information are suitable to some data flow of coming from front controller only, and following chatting face to face stated, and some information produce and write user terminal 155a in the band or bring/be with nonvolatile storage among the outer terminal 155c into, and must be in the transmission of the interval of minimum.

Not data on the same group from front controller 130 to scrambler 104a-104f and the serial data channels of datin 107a send.Known data set or data flow comprises (1) not working channel (OFF Channel) data, (2) peeler channel data, (3) are by watching number of times charging (PPV) channel data, (4) high-quality channel data, (5) go up volume channel data and (6) message channel data.The details of data flow (1)-(4) and (5)-(6) should be respectively with reference to United States Patent (USP) 5058160 and u.s. patent application serial number 799987,800002,800241 and 800836.Working channel data not for example, the data flow of a reference is typically distributed to the channel of no scramble.These have narrated cable television system by the patent application that identical assignee applies for simultaneously, are used to send the user's audio data in the band that end uses by having at display capabilities on the screen.Each data flow of these data flow has unique group address, and it is to be received by one group of scrambler with the address that conforms to.For example, the high-quality channel data can have 01 group address, and therefore all scramblers on the high-quality channel should have 01 group address.Front controller 130 is determined which data of output in each data flow.

According to one embodiment of present invention, data flow (4) comprises the dedicated channel data that is used for specific scrambler or particular data inserter; Therefore, it is not to be addressed to one group of scrambler or inserter, but is addressed to scrambler or the datin that is used for dedicated channel uniquely.With this method, program guide can send to scrambler or datin, is used in the band on data flow (4) audio frequency or video transmission (or both).

According to a preferred embodiment of the invention, additional data flow supply channel program guide information and new business are as follows: (7) basic channel program guide, the channel program guide that (8) are complete and (9) new business.Basic channel program guide data stream (7) for example provides the model of channel-identification and data screen, and the basic structure of carrying out the channel guide function must be provided.Complete channel guide data flow (8) is for example finished this image and is inserted the slit of basic structure so that complete program timetable to be provided.Be the priority that in data, provides higher or higher emergency data and low priority or more not urgent data are provided in other data flow in a selectable method between these data flow.Performance guide information most convenient ground can be the datin that is addressed to scrambler especially or is used to insert a relevant television channel.

New business data flow (9) for example is to be used to transmit data such as text and graph data to terminal, so that show on other untapped channel.May there be scrambler, modulator or signal processor to be selected for the specific TV channel that shows this data flow, because this channel is not used in television transmission.However, the user may be tuned to the screen that a specific channel also receives the data (as comprising text and figure) that send through data flow (9).The screen of data or frame are produced by the symbol generator of depositing of user terminal 150, and process user's television receiver is showing on that channel or on another predetermined channel.Then, the data channel of selection for example can be used as a peeler channel, The Weather Channel, stock market channel or out of Memory source.

New business data flow does not need to send data presented.Data flow also can be used for and need not be confined to telecommunications, fax, video-game, digital audio, captions and other business.When other that is used for not showing when data flow (9) is professional, user terminal and receive the suitable auxiliary receiver of this business or terminal between appropriate interface must be provided.The example of auxiliary receiver is a telephone set, personal computer, facsimile machine, game station, stereophonic sound system and according to the present invention through terminal equipment 150 other specialized receiver of receiving data stream (9) selectively.

In a preferred embodiment of the invention, the numerical data of this data flow of each comprised identification of data flow (1) to (9).The data flow recognition data that scrambler or datin for example receive by the addressed command of setting some control switchs or come by system's control computer or front controller by storage on the front panel of this equipment can be presetted and receive one or several data flow.Therefore scrambler or datin are from this data stream recovery data flow recognition data and this data flow recognition data is conformed to the data of pre-stored.Those data flow that this equipment only recovers to conform to and ignore all other data flow.Certainly, switch is set or by addressed command, the predetermined data flow of specific scrambler or datin of giving can be changed by changing at any time.

According to another embodiment of the invention, front controller 130 provides the data flow of video data in the single further band.That is, has only an additional data flow (7).Video data stream (7) for example can be that channel is relevant in the band, as program guide or scrambler control data, so also be specific scrambler or the datin that is addressed to this channel especially.Such data flow is not decomposed into aforesaid " basic " and " complete ", but single additional data flow,

According to another principle of the present invention, any data flow can comprise the dedicated channel data of specific scrambler or datin.Therefore, this data flow can be addressed to the specific scrambler or the datin of this dedicated channel uniquely.In this method, program guide can send to scrambler or datin, audio frequency or video Data Transmission in a time durations is with on any data flow (perhaps the two).In case sent this guide or other dedicated channel data, if this data flow can be addressed to one group of scrambler or suitable for all datin and scramblers again.

In described embodiment, can be through four to eight bit addresses scramblers by addressing especially.Utilize four to the eight bit address data inserters 107 also can be by addressing especially.This configuration supposition has 256 scramblers and datin for 8 bit addresses maximums.Minimum effective bit can be stipulated 4,8,16 groups such as scrambler such as grade, is different from 4,8,16 groups such as datin such as grade, and the datin group is used for sending band by video data on non-prime channel.Alternative data addressing scheme is as also being used by the channel addressing and being in principle of the present invention.

Scrambler 104a-104f is connected to front end jointing device 130 and can be used for selectively scrambled television signal, the fail safe that the charged TV system of suitable anti-scramble terminal equipment 155 is housed with improvement.Video for example can any method scramble well known in the art, comprises synchronous inhibition, and synchronous backward and video are reverse.For the purpose of explanation, suppose above-identified data flow (1)-(9) of scrambler 104a-104f response.The output of scrambler 104a-104f is added to modulator 105a-105f respectively.Modulator 105a to 105g etc. offers and requires their to change each channel of the cable television system of frequency, and promptly this cable television system requires base band video and audio frequency are modulated to the carrier wave channel frequency in the broadband cable television spectrum rather than the frequency of reception.Modulator 105a-105f and the output that is used for the modulator 105g of non-prime channel offer signal combiner 106, broadband TV signal of combiner 106 outputs comprises data carrier, so as in signal allocation equipment 165 to be assigned to band, band is outer and the band that makes up in, be with outside user's terminal 155a, 155b and 155c.Data to scrambler 104a-f can offer datin 107a etc. through this scrambler, and perhaps they directly provide by seeking ground as mentioned above.

When receiving a channel in identical RF frequency, it is sent out in this frequency, the frequency translation that then known so-called signal processor apparatus (not shown) can be used for receiving is the intermediate frequency (IF) between RF and base band, is somebody's turn to do audio data in the band so that datin 107a inserts audio data in the band according to the present invention by amplitude modulation on sound accompaniment IF carrier wave.In addition, the IF video carrier can be used for interior video Data Transmission or further is demodulated into base band video so that data are inserted into the horizontal or vertical blanking interval of baseband video signal, as what further narrate according to the discussion of following Fig. 2 and 3.

The output of the wideband video channel of the combiner 106 of front end 100 comprises all channels, high-quality with not preferred, scramble and no scramble and be with outer data channel.The bandwidth of cable TV frequency spectrum can surpass 650MH at present ₂, and use optical cable can surpass 1GH ₂

Fig. 2 is the block diagram of scrambler 104f for example shown in Figure 1.Any data flow in the scrambler 104f receiving data stream (1) to (9) comprises the message channel data (4) from front controller 130.The message channel data comprises the character information that is used for display screen, and it is addressed to one or several user terminal that shows on relevant TV.Scrambler 104f comprises data circuit 201, digital circuit 202, and analog circuit 203 and video processing circuits 204 suppose that this scrambler is used to carry out base band video and handles.Data circuit 201 comprises line interface 205 and 206, synchronous date link control (SDLC) 207, microprocessor 208 and digital circuit interface 209.

SDLC 207 is through the 206 control communications of the line interface between scrambler 104f and the front controller 130.The data flow recognition data that SDLC 207 for example can preset by sending with each data flow only receives certain data flow from front controller 130.The front panel control switch of scrambler or datin can received data flow be used to set with the preordering method of interior transmission.These data can be handled through 217 recoveries of parameter selection circuit and at microprocessor 212.Therefore microprocessor 212 signaling microprocessors 208 control sdlc controllers 207 ignore any non-selected data flow.In addition, this data flow can be scheduled to and be stored in scrambler or the datin memory by addressed command.This addressed command is received in microprocessor 208 memories, and data flow data is stored in microprocessor 208 memories.If the data flow recognition data that sends with this data flow be pre-stored in memory in or the data flow data set by front panel switch conform to, then this data flow data will be received by SDLC 207.Other data flow is left in the basket.

Microprocessor 208 receives and handles the information from SDLC 207.Information such as information are stored in the non-volatile message memory of microprocessor 208.In order to guarantee effective storing message data, the non-volatile message memory of 128K byte is at least arranged preferably.The interim message of read/writable memory device storage of microprocessor 208.This data circuit of interface circuit 209 interfaces is deposited circuit to number.

Usually, be used to flow through SDLC 207 from line interface 206 with the path of interior several data flow of transmitting by scrambler 104f, by processor 208, by interface 209 and 210, and through processor 212.Audio data flows through timing and marker generator 215, the path of digital pulse generator 216 and AM amplitude modulator 218 in the band.Video data and control data send to video multiplexer controller 227 in the band, are used for selectively operating video multiplexer 225, will be described in detail in the discussion as Fig. 3 below.

Digital circuit 202 comprises interface circuit 210, phase-locked loop 211, and microprocessor 212, reverse control circuit 213, video attenuation logic 214, timing and label information generator 215, digital pulse generator 216, parameter is selected circuit 217.Interface circuit 210 interface digital circuits and data circuit 201.All basic functions and the characteristic of microprocessor 212 control scrambler 104f.Microprocessor 212 extracts and handles all data flow from data circuit and comprises message data stream (4) and new data stream (7)-(9), scramble mode and the interior video data of process video multiplexer controller 227 control bands of controlling this system insert, and it can comprise the part of digital circuit 202 or video processing circuits 204.

Digital pulse generator 216 responses regularly produce special pulse with the label information generator, and the AM modulator 218 through analog circuit 203 under the control of microprocessor 212 is added on the sound carrier.In the US application serial No. of submitting on June 1st, 1,992 891053, further narrate digital pulse generator 216, quoted the reference that is made for basic theme here.Acoustic pulse can be represented permission and control information in these bands, and anti-scramble information comprises commutator pulse and information or out of Memory.Microprocessor 212 is also received parameter and is selected electricity 217, and it can be that front panel shows and keyboard that parameter is selected circuit 217, and keyboard allows the operator to select various modes of operation, as different scramble modes and/or different data flow.According to the present invention, the required scramble mode data of scramble send through video processing circuits 204 as video data in the band.

Analog circuit 203 comprises AM modulator 218, video attenuation circuit 219, low pass filter 220, buffer amplifier 221, scenery illumination detector 222 and synchronizing pulse separator 223.AM modulator 218 will be from the pulse amplitude modulation of pulse generator 216 on audio frequency intermediate frequency (IF) carrier signal of coming from modulator 105f, and exports this modulated signal to modulator 105f.Video attenuation circuit 219 selectively provides video IF signal suppression type scrambled synchronously and that decay comes from modulator 105f under the control of video attenuation logic 214.

In one embodiment of the invention, datin 107a links to each other with scrambler 104a, according to the present invention, to finish and microprocessor 212, timing is to label information generator 215, digital pulse generator 216 and AM modulator 218 identical functions and have similar structure.In such an embodiment, datin 107a need not to comprise that microprocessor becomes regularly and marker generator, but can play the slave unit of the corresponding component of relevant scrambler 104a.Datin 107a can comprise a data repeater that is connected to line interface 205 simply, is used for audio data stream in the identical band that relaying will provide on the sound carrier of relevant scramble channel.Therefore, audio data stream sends on the high-quality channel as non-prime channel in this identical band.

In a preferred embodiment of datin, this datin utilizes the DCL (not shown) to separate addressing by system's control computer 120.Therefore datin 107a can comprise microprocessor and the timing and one of marker generator that separate, intelligent unit with it.But the datin 107a for example interior audio data of band of amplitude modulation selection flows on the audio carrier of relevant non-prime television channel, as channel identification and performance guide information data flow.

In a further advantageous embodiment, datin 107a further comprises at least some analog circuits 203 and video processing circuits 204, comprise a video multiplexer controller 227 and a video multiplexer 225, as back narration subsequently, be used on non-prime channel, providing video Data Transmission in the band.

Referring to analog circuit square frame 203, the base band video input is carried out filtering with low pass filter 220, and this low pass filter 220 can be a sharp cut-off phase equalization low pass filter.Low pass filter 220 is removed high frequency video component, and this component can produce the noise that can hear from the intermodulation of sound carrier.After the filtering, this video amplifies the original level of getting back to it by the video amplifier 221.Sync separator 223 extracts synchronizing information, and this synchronizing signal is sent to microprocessor 212 so that timing information such as compound and vertical synchronization and strange/even field indication to be provided then.For example, microprocessor 212 is so that scanning frequency rate and the two scanning frequency rates of believing produce timing signal to determine that the interior video data insertion of band, equalizing pulse are removed, the start and stop bit of horizontal timing pulse is put at least, and such requirement, for example 0 IRE video level is set up in the equalizing pulse position that video data inserts in band.Scrambler is by unshowned clock circuit timing, and preferably a crystal-controlled oscillator for example is operated in 20MHz, by the speed that the corresponding clock circuit is shared of any scrambler terminal.The 20MHz clock can be used and can be by known clock division circuits frequency division so that the suitable data rate to be provided by microprocessor 212, for example per second 4 or 5,000,000 ratios, the order of magnitude of the teletext rate of per second 5.7 million ratios be used to send 130 that receive from front controller, as band in the data flow of video data.

Scenery illumination detector 222 is determined the average level of scenery, and this intensity level is added to an A/D converter of microprocessor 212.Microprocessor 212 uses this monochrome information to detect scene change, so that determine when the scramble mode can at random change.Compound synchronizing signal is added to the input of phase-locked loop (PLL) 211.Phase-locked loop 211 pins the scanning frequency rate of system clock to the input baseband video signal.The voltage controlled oscillator (not shown) clock signal of this phase-locked loop is given microprocessor 212 and system clock.

Be added to video processing circuits 204 from the baseband video signal of amplifier 221.Video processing circuits 204 comprises automatic gain control AGC and DC box-bit circuit 224, video multiplexer 225 and video negater circuit 226.If the AGC of AGC and DC box-bit circuit 224 adjusts input signal to a predetermined value such as IV(100 IRE).The DC hoop position of circuit 224 forces the sync tip at earth potential.The output of circuit 224 is added to multi-channel video multiplex circuit 225.A kind of form of multi-channel video multiplex circuit is to separate synchronous circuit, goes through in commonly assigned United States Patent (USP) 4924498, quotes for reference here.The output of this separation synchronous circuit offers negater circuit 226, is used for the reverse base band video of inversion axis.Oppositely be according to controlling from the signal of reverse control circuit 213.The details more specifically of scrambler 104a-d can find in United States Patent (USP) 5058160.

Now narrate the work of video multiplexer 225 in more detail.Microprocessor 212 provides the data that send as video data in the band to flow to multi-channel video multiplex controller circuit 227, video data such as channel guide, new business and scramble control information in the described band.Multi-channel video multiplex controller 227 comprises the line output of enough bits, as three bits output row with method control of video multiplexed 225 with any level of controlling a plurality of voltage levels or the video negater circuit 226 of base band video input signal output.These video levels can be 0 IRE, 5 IRE, 100 IRE, 65 IRE, 95 IRE with for example can be used for separating synchronously and the IRE level of other negative value of synchronous backward scramble.The negative value of using is used for-46 IRE of pulse insertion to eliminate the not anti-scramble of permission of scrambling signal.As signaling by microprocessor 212 like that, the multi-channel video multiplex controller for example export one of eight one of (or 16) as level of suitable selection signal selection input voltage level or base band video so that output to video backspace circuit 226.In this method, can be established as a base less than the voltage level of 100 IRE, less than 80 IRE, less than 70 IRE or as requested like that.After this benchmark provided, identical control signal was coupled with so that set up data pulse at each level with this data transfer rate.Bipolarity output the present invention consider for example at 95 IRE and 0 IRE.The present invention be not attempt get rid of four eight or the pulse-ampli tude modulation of more level to increase data throughput.

In addition, according to the present invention, video multiplexer 225 at the horizontal synchronization pulse level (for example can have,-40 IRE) IRE level input signal, be used for synchronous backward, separate synchronously and be used in the data insertion of per second 4 or 5,000,000 ratios as proposed of about teletext speed (5.7 million ratio/second) or other suitable speed.The clock rate suitable, frequency division that is used for operating microprocessor 212 is used for the operation of timing by the selection signal of multi-channel video multiplex controller 227 generations.

In the band video data can be in office what no time be inserted into and be used for picture transmission.For example and simply referring to Fig. 6 a, data can be inserted into the time durations that horizontal synchronization pulse takies, that is, about 5 milliseconds window, the back follow horizontal synchronization and between the burst signal and after burst signal with motion video before.Such system can be stated as the data in the horizontal synchronization and further increase the interior video Data Transmission ability of band the data except that vertical synchronization in, as mentioned above.Certainly, such system requirements replenish to recover horizontal synchronization pulse with similar methods, as the equalizing pulse of the cancellation in 7,8 and 9 of being expert at by the contemplated recovery of the data in the vertical synchronization.

Perhaps the better method of the interior data of regulation band is the data in level or vertical blanking interval, and focus is that any part of vision signal can be used for transfer of data, not the interfering activity video.For example, in certain embodiments, motion video can be compressed and send and can not reduce from the video image content as video data.In addition, synchrodata also can be compressed.Field mark is represented to change from the field of odd and even number, and each field of short period of horizontal clock is all synchronizing informations, and it is to require in as B-MAC in some known television systems.Therefore, video data can be filled the bandwidth of video signal that is not used in image or the synchronous any part in the band.

Fig. 3 provides the further details of video multiplexer 225.Video multiplexer 225 can comprise parts of scrambler 104f, datin 107a or another parts of cable TV front end, and this front end includes but not limited to a modulator or signal processor.Provide logic control line from microprocessor 212 through multi-channel video multiplex controller 227, be used to control a signal selecting a plurality of input signals, this input signal comprises base band video input signal and several predetermined input IRE voltage level.

Shown level only is exemplary and includes but not limited to comprise 0 IRE, 5 IRE, 100 IRE, 65 IRE, 95 IRE, or-46 IRE.The input of " video is gone into " or base band video is selected during the motion video cycle at least.At all At All Other Times, according to the present invention, the pulse-ampli tude modulation of the transfer of data form that provides can be provided another predetermined level.For example, during level and vertical synchronization, can be inserted between the sync period of selection in transmission of the bipolarity of 0 IRE or sync level.And, can select other during, typically, during base band video, adopt 0 IRE level.

For example to 4 to 6 milliseconds of duration,-46 IRE voltage levels are used as the illegal elimination pulse in the insertion point of the selection of baseband video signal, translate to cheat illegal unit that this pulse is horizontal synchronization, oppositely level is with flat, the perhaps short or long duration as the pulse of another expection such as zigzag synchronously or equalizing pulse.Illegal unit will carry out an operation, its further scrambling signal, and terminal can be presetted and ignore such pulse according to the present invention.

Therefore, according to the present invention, the video multiplexer of Fig. 3 can comprise parts of base band video treatment circuit, is used to carry out various functions.These functions include, but are not limited to comprise the baseband video signal blanking, and data are inserted into the unappropriated any zone of any vision signal, and synchronous backward separates the synchronous pulse insertion of inserting and illegally eliminate.

For example provide in band video Data Transmission during the alternative method of equalizing pulse output be that to force some bit positions of video data in the band be low, that is, those bit positions are time appearance of being scheduled to and press equalizing pulse to transmit.By forcing bit is low, and balanced pulse is not changed or do not sent by amplitude modulator modulation ground.

Fig. 4 is the block diagram that the parts of the user terminal that is used for audio frequency in the receiving belt, the interior video of band and the outer data of band according to the present invention are described.Further details with interior user terminal of band of channel identification and the characteristic information has been narrated in commonly assigned undelegated US application serial No. 799987,800002,800241 and 800836, quotes for ginseng.Though the user terminal of narrating below is the base band user terminal, clearly, other user terminal such as RF user terminal also can use.For example, just the terminal of the interior audio frequency of band can be equipped a 108.2MHz outer data receiver of band or the outer data receiver 400 of other band.If be with the carrier wave of outer data by a 108.2MHz of frequency shift keying transmission, then the outer data receiver 400 of band comprises a fsk demodulator.This as envisaged by the present invention terminal need not to handle baseband video signal and recovers to be with interior data.

On the other hand, the present invention imagines a kind of base band video cable television terminal, and it only handles video data in the band.In an alternative embodiment, base band video cable television terminal according to the present invention comprises video data receiver and the outer data receiver of one or several band in the band.

Referring now to Fig. 4,, data receiver 400 is received from the broadband TV signal of signal distribution system 165 outside reversible transducer 401 and at least one band.The outer data receiver 400 of shown band is connected to the broadband output.Reversible transducer 401 need not to receive from outside the signal of data receiver 400; Each can directly receive parallel input broadband signal.Time spent reversible transducer not 401 be tuned to predetermined channel be used for audio data in the receiving belt.From predetermined this channel of a kind of data transmission method of system's control computer 120 and utilization narration here, this predetermined channel is stored in the terminal equipment according to the present invention.

In use, reversible transducer 401 carries out tuning according to the user through the channel that shakes control 412 or eventually auspicious key plate 411 inputs.For example, the user can select a television channel of watching, aforesaid predetermined " peeler " channel or literal and graph data channel.Reversible transducer 401 uses a phase-locked loop (not shown under the control of data and control circuit 402, be combined in the square frame 401) come that conversion is selected or predetermined elimination RF input signal, for example be transformed to intermediate frequency (IF) signal (typically being 45.75MHz).Data and control circuit 402 utilize two-way link to be linked to reversible transducer 401, and 401 link is used for oscillator tuning from circuit 402 to reversible transducer, and the link that returns is used for tuning FEEDBACK CONTROL.

The output of reversible transducer 401 is branched off into and offers data and control circuit 402 through the directional coupler (not shown), and the intermediate frequency that is used to count the vision signal of inverible transform is exported.The output counting of label f is sent to data by an optional IF band pass filter (not shown) and control circuit 402 carries out noise filtering.Frequency counting is used for the reversible transducer operation to guarantee accurate tuning process and to be used for the signal timing purpose.For example, this frequency counting be stored in the predetermined number that is used for IF-FRE in the memory and compare, and feed back to phase-locked loop up to this intermediate frequency (f) with till the frequency number of storing conforms to.

Filter 403 as this signal of zigzag filter filtering are to remove the RF noise.It is audio frequency and video IF carrier signal that filter 403 further separates input IF channel, under the control of data and control circuit 402, and the vision signal of demodulation and anti-scramble circuit 404 demodulation and anti-scramble filtering.The demodulator circuit of circuit 404 comprises a demodulator, and the pix carrier that is used for demodulate reception is a baseband video signal.If video data is added in the baseband video signal in the band, then video data recovers from this signal in the band, also comprise a sound carrier demodulator as demodulator circuit to Fig. 4 a and the further described circuit 404 of 4b, be used for recovering the data of pulse-ampli tude modulation from sound carrier, audio data in the band is as further narration of Fig. 4 a.Therefore demodulation and anti-scramble circuit 404 carry out pulse detection so that audio data in the band of amplitude modulation is reverted to audio carrier.The restore data of label IB audio data is added to data and control circuit 402.

The volume control of this audio frequency is to be undertaken by separating the anti-scramble circuit 404 of tone mark under the control of data and control circuit 402 and microprocessor 420, as narrating in United States Patent (USP) 5054071, quotes for reference here.

Demodulation and anti-scramble circuit 404 recover the interior video data of band of label IB video and transmit them to data and control circuit 402.Because these data are a quite high speed, regularly in sufficiently high speed, preferably clock circuit 409 is crystal-controlled oscillators, the about 20MHz of frequency or faster by clock circuit 409 for data and control circuit 404.

In the band video data with at the order of magnitude frequency of the known teletext system of per second 5.7 million ratios such as per second 4.0 or 5.0 million than sending, data clock provides the suitable sampling frequency of Nyquist (Nyquist) speed according to known technology, and this known technology is as by frequency division 20MHz clock rate and add clock rate that a phase-locked loop locks frequency division video data signal in the input tape.Data and control circuit 402 are received in video data in the band among the DRAM 418 before being sent to microprocessor 420, and DRAM 418 is as a data buffer before microprocessor processes.The interior video data insertion of band combines the discussion of Fig. 4 a and 4b with the further details that recovers and the waveform of Fig. 5 and 6 goes through.

The signal of response video control line, the recovery of demodulation and anti-scramble circuit 404 control baseband video signals is reverse to comprise the equalizing pulse and the control of video of removing as requested, synchronous backward or any other the anti-scramble function as requiring.For example, the data that response is received previously, demodulation and anti-scramble circuit 404 automatically dispose according to a mode of a plurality of anti-scramble mode of controlling from front end 100 and carry out anti-scramble.

The output of demodulation and anti-scramble circuit 404 is the not baseband video signals of scramble, and this signal is added to screen display control circuit 406.Screen display control circuit 406 can be Mitsubishi M 50556 screen display controllers or similar integrated circuit or special application integrated circuit.Screen display control circuit 406 selectively is created in the character and the graphical display of screen, substitutes or overlaps on the vision signal.Also able to programme according to United States Patent (USP) 4991011 background sounds.Modulator 407 conversion comprise video, audio frequency and/or from the signal of the character of the demonstration control 406 of channel 2/3/4, it is added on the television receiver 408 with known method.

The whole operation of microprocessor 420 or other data processing controller control user terminal 155C.Keyboard 411 on the front panel of user terminal produces the signal that the user provides, and is used for channel tuning, volume level or the like, and this signal is added to microprocessor 420.Remote receiver 415 receives order from infrared (IR) or other remote control unit 412, as known in the art, and provides this to order microprocessor 420.Reset circuit 416 resets microprocessor and/or data and control circuit 402 so that power-supply fluctuation is being arranged, and power failure or similar incidents guarantee the operation that this system is appropriate when requiring reseting procedure.

When keyboard 411 or IR shake control unit 412 and are used to select television channel, processor 420, most convenient is that microprocessor instructs data and control circuit 402 are controlled reversible transducer 401 tuning selected television channels rightly, perhaps not in use in this terminal, be tuned to predetermined elimination channel.Data and control circuit 402 use the anti-scramble data that recovers to produce suitable control signal, recover or regeneration with balanced and the same as reverse control, are used for anti-scramble or the opposite input base-band television signal that recovers.Whether microprocessor 420 specified datas and control circuit 402 carry out anti-scramble at specific channel, perhaps at special time, for permission and the control data of translation, determine to require which kind of anti-scramble form (any of three kinds of data transmission schemes discussed here: audio frequency or the interior video of band outside being with, in the band) from system's control computer 120 those acceptance.

Light-emitting diode display 413 indicated channels number and diagnosis.Nonvolatile storage (NVM) 414 or similar memory stores data, for example: permission data, scramble channel data, scramble mode data, the data of terminal configuration data and other requirement.Processor 420 can have some permanent memories onboard, for example is used for the storage of program storage or software and the random access memory (not shown) can be set.User terminal 155C can randomly comprise pulsed pay-per-view (IPPV) module 417.IPPV module 417 allows the user to permit their user terminal to receive the pay-per-view program, the storage data relevant in nonvolatile storage 414 with the purchase of program, and a radio frequency road of process phone return path or process signal allocation equipment 165 is through sending these data to system operator.

Other configuration of terminal 155C shown in Fig. 4 is possible.It is outside DRAM that DRAM 418 need not, but can be used as static RAM is combined in data and the control circuit 402.In addition, nonvolatile storage 414 can be combined in the microprocessor 420.Data and control circuit 402, demodulation and anti-scramble circuit 404, screen display controller 406, some pulsed pay-per-view functions of microprocessor 420 and IPPV module 417 can be combined in one, in two or three special application integrated circuits, this depends on the compromise of cost benefit and operating efficiency.

Many other characteristics narration in (docket of agency, number A-459) in the undelegated application serial of submitting to simultaneously to the inappropriate user terminal 155C of the present invention.For example, terminal 155C can comprise that is inserted an Extender Card, is used to guarantee the safety of communicating by letter and operating, and a data port is used to transmit and receive data and AGC and AFC circuit.

Referring now to Fig. 4 a and 4b,, narration at length recovers the process of video data in the band.In conjunction with Fig. 6 a, the waveform of 6b and 6c is narrated the working condition of demodulation and anti-scramble circuit 404 and data and control circuit 402 now.In the process of Fig. 4 a and 4b, the terminal equipment 155C of Fig. 4 is prenoticed data and has been inserted the line number of vertical blanking interval, and this is not main.This circuit allows from real data transactions separately noise and video, handles data recovered and the gating data recovered step in the video data buffer.Each provisional capital of baseband video signal is checked the data content, data are recovered and the further kinetic energy of identification is to be determined by the existence of video data figure in the predetermined band, for example, determine by the waveform of Fig. 6 a and/or by unique data bit figure with predetermined number of bits.

Offering demodulation and base band video anti-scramble circuit 404, that receive receives with maintenance 451 and video limiter 453 places in sync limiter 450, benchmark sample value.Referring to the waveform of Fig. 6 a, the video of reception comprises a sync section, a colour burst, possible anti-scramble product and the data division that comprises benchmark and data.This predetermined figure is different with the video measurement data with the transfer of data such as the caption data of motion video and requirement.Between the end of benchmark and beginning, one millisecond or 4 bit intervals can be arranged at the transaction data of 0 IRE.Sync limiter 450, synchronization scheme identifier 452 or the like forms a synchronous chain, is used to discern horizontal synchronization, vertical synchronization and a therefore definite benchmark window and determines the benchmark strobe pulse that chain uses by data.Data determine that chain comprises the benchmark sample value and keeps 451, video limiter 453 and data identification device and checking circuit 456.

From synchronous chain, sync limiter 450 seeks that signal between 0 IRE and-40 IRE determines whether to occur synchronously, zigzag synchronously or equalizing pulse, and provide and output to the synchronization scheme identifier.Timing is at signal of synchronization scheme identifier output of 20 megahertz clock speed of terminal, if having horizontal synchronization or vertical synchronization and synchronous mark of conformity.Horizontal synchronization is output to window generator 454, and it produces a benchmark window (Figure 66), is used for the forward position of the benchmark of Fig. 6 a.Horizontal synchronization also offers benchmark gating generator 455, is used for producing a benchmark gating signal by Fig. 6 c.Window generator 454 and benchmark gating generator 455 are by the 20 megahertz clocks timing of terminal 155C output.Value shown in Fig. 6 only is exemplary, and under the situation that does not break away from spirit of the present invention, those of ordinary skill can depart from these values.

Now, data chainning is discussed in more detail.Baseband video signal at first offers the benchmark sample value and keeps 451, and it receives the benchmark gating signal as input from benchmark gating generator 455.By 11.8 milliseconds of gating benchmark sample values and holding circuit after the reference position of expectation is as the detection in level, can avoid anti-scramble product (is shown in Fig. 6 and a) is interpreted as the possibility of benchmark.For example between one millisecond of window phase, benchmark sample value and keep ground 451 sampled signal level and keep this value to be used for further processing between short for example 0.5 millimeter window phase.For example, if the reference level that receives is 95-100 IRE, the data slicing level of 47.5-50 IRE is sent to video limiter 453.If the level that receives is less than 100, as 65 IRE, then the level of 32.5 IRE is sent to video limiter 453.After this benchmark, video limiter 453 will be sent to data identification device and checking circuit 456 and Fig. 6 b near any signal of data.Utilize its position, amplitude, frequency and/or predetermined bit figure, the captions of data identification device and clock circuit motion video and requirement or data test signal are distinguished the video data in being with.The data pulse of receiving at data identification device circuit 456 utilizes the synchronous qualified signal of synchronization scheme identifier 452 to export, and utilizes level and vertical synchronization input and utilizes true edge to make it qualified along window (Fig. 6 b).The true edge of Fig. 6 for example comprises one millisecond of window along window signal, 11 milliseconds of beginnings that are used to discern reference signal after the detection that horizontal synchronization begins.Data identification circuit 456 is determined the beginning of benchmark and at 50 milliseconds, 200 bits, after connect between the 25 byte data window phases of beginning of benchmark the data identification business be provided.Real and accurate appearance of video data in the data qualifier mark signaling band.The data qualifier mark can further make a kind of reception data qualifier of form and prevent another data, and for example the new business data prevent anti-scramble mode data.The data identification device also can be carried out EDC error detection and correction, for example passes through cyclic redundancy check scheme or other data error detection or detection and bearing calibration.

The output of data pulse stream offers the circuit of Fig. 4 b, and particularly at negative data edge view finder (finder) 460, data qualifier circuit 461 is locked in 20 megahertzes.If the predetermined number of data sample for example equals 2 or 3, then video data is sent to data shift device 464 in the band.When the data pulse edge becomes negative negative data edge view finder signaling timing synchronizer 462.Therefore the timing synchronizer that is locked in 20 megahertzes is sent out erasure signal and is used for 5 frequency divisions, 20 megahertz clocks with circuit 463 and provides one 4 megahertz to export to removing.Be a data clock then, data moved letter to gating circuit 465 through data shift device 464 except that output with circuit 463.

It is DRAM 418 that data strobe circuit 465 requires from the data qualifier mark of data identification and checking circuit 456 data strobe that receives to be gone into the interior video data buffer 466(most convenient of band), perhaps gating determines that the data of anti-scramble mode are to demodulation and anti-scramble circuit 404.The DRAM 418 that narrates previously provides a data buffer, is used for the interior video data of buffer strip to microprocessor 420.

Therefore, in the process of video data by Fig. 4 a and 4b and in reference to the recovery band of Fig. 6 narration, the method comprising the steps of: determine level with flat beginning, set up gating signal that is used for the detection reference signal level and the data window that is based upon corresponding to restore data on the value of baseline signal level.Appear at before the horizontal pulse and burst gating pulse possible anti-scramble product has afterwards been avoided according to this enforcement, this product can worsen data recovery procedure.

Referring now to Fig. 4 C,, it represented to be used for from be tuned to the channel of video recover audio data in the band a user terminal 155C part, block diagram more specifically.In reversible transducer 401, recover, be tuned to the IF channel of video be input to zigzag filter 403, as narrating.Video image signal V offers remainder of demodulation and anti-scramble circuit 404 or the like through filter 430, as narrating.41.25MH ₂Audio I F carrier wave offer synchronizing indicator 421.By two IF carrier waves of mixing (45.75 and 41.25MH ₂) and extract difference, synchronizing indicator 421 conversion IF audio carriers are 4.5MH ₂The intermodulation frequency.Output is in band pass filter 422, at 4.5MH ₂The place carries out filtering and offers the FM modulator, and this audio frequency baseband signal is recovered according to United States Patent (USP) 4567517.Then, modulate again at modulator 407 before the base band audio frequency of volume control, carry out volume control, as narrating in the laid-open U.S. Patents 5054071.

The 4.5MH of band pass filter (BPF) 422 ₂Audio carrier output offers amplitude modulation detector 424, and detector 424 for example can comprise a simple diode detector.If the horizontal timing pulse sends on sound carrier, these can be used for the control of synchronizing indicator 421.The data pulse that detects is carried out filtering to eliminate noise and in pulse shaper 426 shaping again in low pass filter 425 speed of for example being expert at.The data pulse that suitably forms is input to data and control circuit 402 as the IB audio data then.

Referring now to Fig. 5,, is described in more detail and inserts in the vertical blanking interval of baseband video signal and the process of decoded data.Waveform 5a is typical base band video waveform, expression standard N TSC composite sync, and row 7-11 is identical after vertical blanking interval begins.PAL/SECAM and high definition TV synchronous form still to be determined all relate to horizontal blanking interval that same form is provided and vertical blanking interval so that allow television receiver respectively scanning beam to be moved by side to opposite side or moves on to top from the bottom from one of image.Therefore, according to the present invention, can be applicable to any TV format in the obsolete time of motion video as the principle that video data signal in the band is provided at some blank lines during the vertical blanking interval of baseband video signal, and just using NTSC signal format by way of example.

In fact, use principle of the present invention, not only can use vertical blanking interval, but and the usage level blanking interval partly be used to be with interior video Data Transmission.For example, can remove some horizontal blanking impulses and data are inserted on their position.

An embodiment according to video terminal 155C in the band, the data of receiver and control circuit 402 can keep counting and timer clock of horizontal line, and this timer clock arrives the phase-locked loop 211 of microprocessor 212 and descrambler with the similar method speed of being expert at synchronously.The timer clock of user terminal is highly accurate and can determines that the lock-out pulse of expecting comprises the beginning and the end of equalizing pulse.

In the alternative embodiment of the embodiment that is discussed in conjunction with Fig. 4 a and 4b, according to odd field and even field, data and control circuit 402 can be from the countings that begins of vertical blanking interval, and accurately determine the position of the data of removing from baseband video signal.This embodiment supposition utilizes the transaction that sends previously, terminal 155C to know in advance which row video data is positioned in the band.Referring to Fig. 5 C, under the control of data and control circuit 402, demodulation and anti-scramble circuit 404 recover this data by the analog level of determining reference signal earlier, and the predetermined row that occurs according to data provides this reference signal with the level that is no more than 70-100 IRE.Demodulation and anti-scramble circuit 404 comprise a data amplitude limiter, be used for greater than half of fiducial value or less than half, or 30-50 IRE determine bipolarity data and output demodulated data signal, are stored among data buffer such as the DRAM 418.

Referring to Fig. 5 b, demodulation and anti-scramble circuit recover vision signal by regeneration equalizing pulse or other pulse of removing, and this pulse of removing is removed at front end 100, and replace them with the baseband video signal that outputs to screen control circuit 406.The circuit that is similar to digital pulse generator 216 can be used for producing special pulse such as equalizing pulse, and/or the video multiplexer 225 of Fig. 3 can be used for producing compound waveform.Certainly, data and control circuit 402 are according to the instruction works of microprocessor 420.The data in the memory are received and are stored in response early the time, 420 decodings of microprocessor at predetermined those row of front end system control computer 120 to comprise video data in the band.Data and control circuit 402 do not plan to handle the row of vertical blanking interval, for example are used for by professional caption data as row 21.

In the 3rd embodiment, must be according to the embodiment of Fig. 4 a and 4b, promptly, determine the existence of video data in the band through predetermined datagram, and avoid in the predetermined data that worked, as 21 the caption data of being expert at is ignored data in some predetermined row by presetting terminal 155C.From the consideration of the foregoing description, can find out the additional embodiments that video data recovers in the band equally.

For the horizontal blanking interval transmission and with reference to Fig. 6 a, horizontal pulse comprises the duration of about 5 microseconds.In addition, data can be so-called the back along and before burst gating pulse, send.Available-40 IRE of the beginning of horizontal synchronization, horizontal pulse identification short, 1 microsecond.Suppose that the benchmark back of 1 microsecond determines synchronous beginning, the remainder that also stays 3 to 5 microseconds is used in the data that sent about 12-20 bit before burst gating pulse, and the 1 or 2 microsecond back of lacking connect burst gating pulse, are used to send other 4-8 bit.Be used for determining technology that whether horizontal pulse exists or data can by determine horizontal pulse begin start, as discussing in conjunction with Fig. 4 a and 4b.Then, the benchmark gating can be set up immediately so that determine whether benchmark exists or a horizontal pulse.Then, whether preceding 3 to 5 microsecond data windows can begin to be used for data identification and check this to be really before burst gating pulse: data just send in the horizontal blanking interval.Every row of 5 to 8 row of 3 to 5 bytes can form 25 byte transaction of equivalence.Simply referring to Fig. 7, if in the band video data through the horizontal blanking interval can be used for A or B transaction or even the row of some groups can be used for C, D or the E class transaction of length when being intended for these transaction.The horizontal pulse left out part and back are along replacing with digital pulse generator 216 or by the multiplexer of Fig. 3 of terminal 155C.Sort circuit most convenient ground is the part of demodulation and anti-scramble circuit 404.

For video data in the coding band, according to the present invention, at scrambler 104f or datin 107a opposite operation takes place.The baseband video signal of Fig. 5 a is handled according to the instruction of receiving from system's control computer 120 at scrambler microprocessor 212, and row is used to be with interior video Data Transmission.As previously described, system's control computer 120 is through front controller 130 control scrambler operations.Because Fig. 3 is through the multiplexing work of multi-channel video, the cut-out of motion video or base band video input signal takes place simultaneously with the insertion data pulse.Need not in the two step processes of selecting row as row 7-9 removes equalizing pulse earlier, shown in Figure 56, though two step processes can be undertaken by logical circuit, as known in the art before data are inserted.

The capable 7-9 of the vertical blanking interval of NTSC standard television signal comprises that 3 take advantage of 63.5 microsecond duration or about 190 microseconds.The equalizing pulse the same with the scanning frequency rate uses 6 to take advantage of about 2.5 microseconds or 15 microsecond duration; Therefore, remaining about 180 microseconds.The data slicing benchmark only need comprise 1 to 5 microsecond burst gating pulse, and also remaining 150-175 microsecond is used to be with interior video data, even every row only sends the useful data of 50 microseconds, shown in Fig. 6 a.If all six equalizing pulses are all removed, the reference frequency burst gating pulse of data rate can be every row repeat or every only send once.If video data is pulse-ampli tude modulation in the band, then the purpose of benchmark provides the data slicing level.Therefore, if change to 80 IRE or 70 IRE from 100 IRE, require fiducial value that a new data slicing level is provided according to the capable maximum impulse amplitude of selecting.Other data transmittal and routing form of video data in the band be can use according to the present invention, pulse-width modulation and pulse-code modulation included but not limited to.Can use more than row 7-9; In fact, as long as allow the transfer of data of motion video and requirement to be without damage, can use the capable 1-3 of vertical blanking interval and any row of 7-21.

The horizontal blanking interval can be used to be with interior video transmission similarly.Can be used for the beginning of signaling level at-40 IRE, short microsecond pulses.Afterwards, reference level can be followed, and the data window that meets Fig. 6 a to 6c principle is established for data identification, as previously discussed.

Referring now to Fig. 7,, represented to be used to a table with the data transactions form of audio frequency in interior video, the band and the outer transfer of data of band.Described form only is exemplary, and can revise to be suitable for special transfer of data requirement and desired transaction.This chart is described a plurality of transaction type, for example can be expressed as the type A-E with different length.Transaction type A is a finite length, and can think at least a portion that is included in the packet of a plurality of bytes in the particular sequence and comprises a data flow, and as mentioned above, it can have relevant transaction code.The example ranges of transaction type A is the 8-24 byte.

For the band in video data, value was less than or equal to the Frequency Synchronization pulse reference of 70-100 IRE before these data, and the detection level half or on 35-50 IRE, set up a data amplitude limit value.Can use the beginning of a preamble recognition data.Time/address date can alternately provide in the data slot of a data grouping, and this time is used to provide the more moment of the real-time clock of new terminal, and the address is used to discern the terminal of addressing when needing.Use one constantly transaction more new terminal in United States Patent (USP) 4994908, specifically chatted into, quote for reference here.

Order or instruction that transaction code or operand provide this terminal to carry out.Described data are used for according to this operand or transaction code work.For example, these data can comprise scramble channel table and operand, perhaps transaction coded signal, the storage of new scramble channel table in terminal memory.Error detection and/or error correction (or redundant transmission) or other error check technology are used to guarantee the accuracy of data and reduce the error rate according to known technology such as cyclic redundancy check.

Show be used to in the high check indicator of bit of audio frequency, solving the problem of audio data transmission in the band of not opening, commutator pulse can produce with sound carrier on the product obscured mutually of the data pulse that sends.Advise that according to the present invention use alleviates this problem than the extra-high-speed counting.

It is odd number or even number that field flag can be discerned these data.Field flag most convenient ground is used for the difference of the transaction of the expectation of signaling between odd number and even field in the audio data transmission in band.The scramble mode can tell demodulation and any scramble mode of anti-scramble circuit to be used for tuning channel.Other data that exclude comprise fax, teletext, second kind of subtitle language or caption data, program channel guide (data flow (7) or (8)) and other new business data (sending through data flow (9)).

If data transactions type A has the M byte long, then transaction type B can be expressed as the N byte long.Transaction type B is long transaction, for example is used to discern the channel table of scramble.It can for example 1.5-2 be relevant with transaction type A with a coefficient easily.As shown in the figure, transaction type B has the byte long as 12-36.

Longer transaction may be a Type C, has the 2-4.5 double-length of transaction type B length.These transaction can comprise longer data flow such as channel tuning data.

Transaction type D can be equivalent to three type A transaction or two type B transaction.On the other hand, transaction type D may have only a transaction code, and no matter its length how.For example, but the memory of transaction type D signaling channel program guide show.

Longer transaction code can be imagined and is used for new business, as type E or the like.These transaction have predetermined data format, and can be equivalent to a plurality of type A and/or type B transaction.Therefore the relation between the various transaction type can be determined.If a type A transaction comprises that M byte and a type B transaction comprise the N byte, then the longer office of other type ought to be surrounded by the public same sex and/or the coefficient of being determined by M or N 2.For example, a type D transaction can be a long transaction, has a transaction code or comprises three type A transaction or two type B transaction.This public affairs same sex helps to reduce decoding and the storage at user terminal such as terminal 155C, if particularly predetermined this terminal is sought the Several Parameters that is listed among Fig. 6 with predetermined order.

Audio data is known in the band, and each video line sends a bit, perhaps sends with the speed less than every 262 of vertical synchronization duration at interval or 263 row.Because giving over to, some data slots in so-called dynamic synchronization inhibition system, transmit the desired certain timing information of anti-scramble, so the bit rate in this system further is limited.The audio frequency hurdle has reflected this restriction to the explanation of type E transaction length in band.Yet in some embodiments of the invention, this data rate can suitably increase to allow long transaction, so long as type E or longer.

A purpose setting up the tentation data form is to reduce decoding and storage.For example, video data can be decoded and to be similar to audio data in the lower band or may to be that the search method of the outer data of band of another bit rate is stored in the band of quite high data rate.

In addition, at front end, system's control computer 120 or front controller 130 can format the transaction of a type according to Fig. 7, in case format, this transaction need not to format again, to transmit through any mode of three kinds of data transfer modes described here: audio frequency, the interior video of band or the outer transfer of data of band in the band.

Like this, represented and narrated a kind of side and equipment of transfer of data, this equipment reaches purpose of the present invention.Those of ordinary skill in the art can know its difference from being described in detail of top accompanying drawing.All patent applications of being quoted here and disclosed patent should be thought to quote here as the reference to main theme.

Claims (41)

1, in a television system, a kind of equipment that transmits data, this equipment comprises:

System's control computer, the data that are used for determining the vision signal row of insertion data and are used to determine be inserted into,

A baseband video signal processing unit is used for removing equalizing pulse from selected row,

Insert device with data, be used for inserting data to the row of determining.

2, according to the data transmission set of claim 1, further comprise a data modulator, be used for the sound carrier of data-modulated in vision signal.

3, according to the data transmission set of claim 1, wherein be inserted in the data of determining in the row and comprise from the next data of a data flow of a plurality of data flow, this data insertion device is presetted and is used to receive specific data flow.

4, according to the data transmission set of claim 1, wherein data insertion device comprises the storage device that is used to store a unique address.

5, according to the data transmission set of claim 1, wherein data insertion device comprises an amplitude modulator, is used for this baseband video signal of amplitude modulation.

6, according to the data transmission set of claim 1, wherein data are inserted the video multiplexer that device comprises the reference-input signal of a plurality of predetermined amplitudes.

7, according to the data transmission set of claim 1, further comprise data modulator, be used for the data carrier of data-modulated in a frequency of any frequency band outside of transmitting television signals.

8, according to the data transmission set of claim 1, the equalizing pulse of wherein removing comprises at least one outer equalizing pulse, that this equalizing pulse occurs at horizontal line frequency and and appear at horizontal line frequency between the synchronous equalizing pulse of horizontal pulse in subsequently the field in the middle of occur twice.

9, according to the data transmission set of claim 1, wherein the row of Que Dinging comprises the row 7,8 of a video field or at least one of 9.

10, a kind of equipment that transmits data in charged TV system comprises:

System's control computer is used to be formatted in the data that transmit on the outer data carrier of a band and is audio data in the band for the data that outer data of band and format are transmitted,

A front controller is used to control the transmission of this band audio data,

A data inserter, the response front controller, be used to insert audio data in this band as the amplitude modulation(PAM) of the sound carrier of selection and

The outer data transmitter of band is used to send the outer data of formatted band,

A television terminal is adapted to audio data and the outer data of band in the receiving belt, and the channel that terminal is tuning is not depended in the reception of these data.

11, according to the data transmission set of claim 10, wherein datin comprises a scrambler, and this scrambler is used for predetermined and television channel of scramble.

12, according to the data transmission set of claim 11, wherein datin comprises a data repeater receiving scrambler, is used for audio data in the band is inserted in the sound carrier of the second scheduled television channel.

13, according to the data transmission set of claim 10, wherein datin further comprises the baseband video signal processing unit, be used for data are inserted in the part of baseband video signal, this baseband video signal is not used in the picture transmission as video data in the band.

14, according to the data transmission set of claim 13, wherein audio frequency, the interior video of band and the outer data of band are carried out form with similar methods so that received by a television terminal in the band.

15, be used to receive the equipment of data in a television system, this television system comprises a transmitter that is used to send audio data in interior video of band and the band, and this equipment comprises:

Be used to receive the device of television channel,

In the band that is used to recover on this television channel, to receive the device of video data and

The device of audio data in the band that is used to recover on this television channel, to receive,

16, be used to receive the equipment of data according to claim 15, further comprise:

Be used to receive second channel device and

The device of data outside the band that is used to recover on second channel, to receive.

17, a kind of method that sends data to a plurality of terminals in a television system comprises step:

In the select tape or the outer transmitting device of band or both be used from the transmission data,

If transmission in the select tape, the data of addressing insert device be used for video data in the band be inserted into predetermined video channel and

If select tape transmits outward, then send the outer video data of band video data emission machine outside band and transmit.

18, the method for transmission data according to claim 17 comprises that further form is scheduled to, no matter the data transmittal and routing form of selecting according to a form of a plurality of predetermined formats step with the data format that is transmitted.

19, the method for transmission data according to claim 18 further comprises the step of setting up data transmission queue in the band, if this formation is full, the outer transmitter of interior video data to a band of band that shifts pre-form transmits.

20, the method for transmission data according to claim 17, the data that wherein are sent out comprise a data flow of a plurality of data flow, and this method further comprises step:

Utilize the data flow recognition data to discern this data,

Preset a data inserter, be used to receive one or several data flow,

With storage identification received data flow datin in and

If when conforming between the data flow data that exists storage and the data flow recognition data, receive the data flow of Data transmission stream recognition data at datin.

21, a kind of method that receives data in a television system comprises step:

Receive a television channel,

From the TV data that receives recover in the band video data and

Recover audio data in the band from the TV data that receives.

22, according to the data receive method of claim 21, further comprise step:

Receive second channel and

Data outside second channel recovers band.

23, according to the method for the reception data of claim 21, wherein the television band of Jie Shouing comprises a baseband plot picture signals, the equalizing pulse of determining is removed from this baseband plot picture signals, and this method comprises that the equalizing pulse that recovers to determine is the further step of baseband plot picture signals.

24, according to the method for the reception data of claim 21, be included in that television band receives and band in video data determine in television band the preliminary step of the identifier of video data position in the band before recovering.

25, according to the method for the reception data of claim 21, wherein video data is through the television channel reception of no scramble in the band.

26, according to the method for the reception data of claim 21, wherein video data is to recover from the predetermined row of the vertical blanking interval of the parent map picture signals of the television channel that receives in the band.

27, according to the method for the reception data of claim 21, wherein video data is to recover according to the tentation data figure of following by in the data window of the beginning of horizontal synchronization in the band.

28, according to the method for the reception data of claim 21, wherein video data is to recover from the horizontal blanking interval of the baseband plot picture signals of the television channel that receives in the band.

29, according to the method for the reception data of claim 28, wherein video data is to recover according to the tentation data figure of following by in the data window of the beginning of horizontal synchronization in the band.

30, a kind of data transmission set that is used for a television system, comprise a video multiplexer, be used to receive an input baseband video signal and a plurality of other input signal, other input signal is including, but not limited to the signal of at least two different predetermined voltage level, this video multiplexer comprises two output control lines, select output in this input signal, this video multiplexer provides an output baseband video signal that comprises video data in the band.

31, according to the data transmission set of claim 30, wherein the signal of two different predetermined voltage level comprises that one 0 IRE signal and one are less than 100 IRE signals.

32, according to the data transmission set of claim 30, wherein the signal of two different predetermined voltage level comprises one 0 IRE signal and the signal of a level between-40 and-50 IRE.

33, a kind of method that transmits data in a television system comprises step:

Address data inserts the equipment group, this equipment group be used on a plurality of video channels, transmitting data and

The predetermined data of addressing are inserted equipment, and this data insertion equipment is used for corresponding uniquely described tentation data and inserts video data in the data channel upper conveyor belt of equipment.

34, be used for the data transmission set of a television system, comprise:

First data transmitter is used to insert the video channel of data to scramble,

Second data transmitter, be used to insert data to the video channel of no scramble and

Device for addressing, be used for the addressing or first or second data transmitter or two transmitters, each data transmitter has a unique address, and first data transmitter has first group address, and second data transmitter has second group address that is different from first group address.

35, be used for the data transmission set of a television system, comprise:

A system controller is used for a plurality of transaction that form is sent to user terminal, and the transaction that is transmitted comprises video data in the band, audio data and the outer data of band in the band,

Datin at least one band is used for being transmitted in the data of predetermined video channel, comprise an audio carrier and video image carrier wave and

The outer data transmitter of band is used for the outer data of conveyer belt,

This transaction is dissimilar and has transformable length, the transaction of the first kind has at least one transaction code, and comprise predetermined byte number between 12 and 36, the pre-real number here is M, the second class transaction comprises the predetermined byte number between 16 and 48, the predetermined number here is N, and the transaction of the 3rd type comprises the predetermined byte number between 24 and 72, and the predetermined byte number here is the multiple of M or N.

36, the equipment of video data in a kind of band that is used to receive television channel comprises:

Synchronizer is used for determining the beginning of horizontal synchronization,

The gating apparatus for establishing, the very first time that begins to be correlated with that is used to be determined at horizontal synchronization at interval,

The level evaluation device is used in interim very first time evaluation signal level,

The data window apparatus for establishing, be used to set up with horizontal synchronization begin the second relevant time interval and

Data Recapture Unit, on the signal level relevant with the level of determining by the level evaluation device from second time interval restore data.

37, at a television terminal, a kind of method that receives the interior video data of band of television channel comprises step:

Determine the beginning of horizontal synchronization,

Foundation begins the relevant very first time at interval with horizontal synchronization,

Evaluate this signal level in the interim very first time,

Set up with horizontal synchronization begin the second relevant time interval and

On the relevant signal level of the level of determining during the signal level estimation steps from second time interval restore data.

38, basis further comprises step in the described method of claim 37:

Regard these data as first or second type,

With the data strobe of the first kind go into anti-scramble circuit and

Store the data of second type.

39, according in the described method of claim 37, further comprise the step of any equalizing pulse of removing of regenerating.

40, according in the described method of claim 37, further comprise the step of any part of removing of regeneration level blanking interval.

41, basis is in the described method of claim 37, wherein video data is passed on by this terminal in the predetermined band of Que Dinging, comprise further making the qualified step of video data in active images video and video data comes in the predetermined band of determining the band that video data is that amplitude, frequency, position and figure by their expectations passes in this predetermined band of determining.

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