CN101080021A - Apparatus for demodulating broadcasting signal - Google Patents

Abstract

The received frequency and symbol timing is synchronized, and the transmitting frames is reconfigured before the equalizer compensates the channel. The signal synchronization device confirms the correlation of the digital data in the frame synchronization field section of the received transmitting frames, and transmits the frequency and the symbol timing of the frames according to the assured relevant result, wherein the transmitting frames of the synchronization frequency and symbol timing includes a main signal and at least one or a plurality of double-image signals, besides the signal reconfiguration unit reconfigures at least one or a plurality of double-image signals according to the relevant result and the main signal, execute DFT to the reconfigured transmitting frames, and the equalizer executes the channel compensation.

Description

Apparatus for demodulating broadcasting signal

The cross reference of related application

The korean application sequence number 10-2006-0023543 that the application applied for based on March 14th, 2006, and require its priority.It openly is combined in this as reference data integral body.

Technical field

Below description be usually directed to a kind of apparatus for demodulating broadcasting signal that is used for the broadcast singal that demodulation receives by the receiver of receiving broadcast signal.More specifically, this description relates to a kind of apparatus for demodulating broadcasting signal, the frequency of the transmission frame that is used for receiving synchronously and symbol timing, and, compensate (counteracting) preceding transmission frame of reshuffling at channel by equalizer.

Background technology

At present, digital broadcasting based on multiple technologies by local standardized.For example, China still under discussion broadcast standard comprise digital land multimedia broadcasting (Digital Terrestrial MultimediaBroadcasting, DTMB).In question DTMB standard is used a kind of new modulation scheme, be called time-domain synchronization OFDM (Time Domain Synchronous-Orthogonal FrequencyDivision Multiplexing, TDS-OFDM).

The service of OFDM scheme is launched to adopt in Europe, and this scheme is a kind of modulation scheme with digital data transmission land ripple.Information is divided into several carrier waves in the OFDM scheme, and the gap between the carrier wave that quadrature divided to minimize is provided, described carrier wave transmits after multiplexing.

Usually; in TDS-OFDM; the transmission data are through contrary discrete Fourier transform (DFT) (InverseDiscrete Fourier Transform; IDFT); as in Cyclic Prefix OFDM (Cyclic PrefixCP-OFDM); and adopt a kind of pseudo noise (PN) sequence as training signal (known array; pilot frequency sequence); to replace protection (Guard Interval at interval; GI) Cyclic Prefix in (CP); be used for reducing the transmission spending, and improve channel efficiency, strengthen synchronizer and performance for estimating channel.The formula that is used to create the PN sequence can be obtained by following formula 1:

[formula 1]

P(x)＝x ⁸+x ⁶+x ⁵+x+1

Usually, arrange a kind of equalizer at the receiver side of the broadcast singal that receives OFDM (OFDM) type.Equalizer is carried out the inverse matrix computational process with respect to channel response matrix, with compensate for channel.

In the transmission data procedures of the OFDM type that demodulation is received by the multichannel route, when the channel response matrix with respect to the transmission data that comprise Cyclic Prefix (CP) carried out discrete Fourier transform (DFT) (DFT), channel response matrix was converted into diagonal matrix.

Each element of channel response matrix is one the circular matrix that has symmetry about diagonal, so that diagonal matrix can be only calculated inverse matrix by the diagonal element of matrix.Like this, the equalizer that receives the receiver side of OFDM type broadcast singal can calculating channel response inverse of a matrix matrix, with the channel of compensation received signal.

Yet because TDS-OFDM type transfers data comprise the PN sequence in protection at interval, the transmission data that receive by the multichannel route can not become cycle signal in all data breaks.Thereby,, then need the inverse matrix of a large amount of hardware resource calculating, because channel response matrix does not become circular matrix with respect to circular matrix if on the transmission data of the TDS-OFDM type that receives, carry out DFT.DFT carries out under the situation of cycle data distribution, so, the DFT correct execution of under the channel equalization process on the equalizer can not the situation of data-driven non-periodic distribution, carrying out.

Summary of the invention

The application's a purpose provides the apparatus for demodulating broadcasting signal that a kind of TDS-OFDM of demodulation simply type receives data.

Another purpose provides a kind of apparatus for demodulating broadcasting signal that can demodulate reception data, thereby carries out channel compensation more accurately than equalizer.

According to an aspect of the present disclosure, the frequency of the transmission frame of reception and symbol regularly carry out in response to being contained in the correlated results that receives the PN sequence in the transmission frame synchronously.

The realization of this aspect comprises one or more following characteristics.

Main signal and double-image signals (ghost signal) are separated in response to the correlated results of transmission frame, and the frequency of described transmission frame and symbol are regularly by synchronously, and separated double-image signals are reshuffled in response to main signal, carry out DFT and channel compensation.

For this reason, apparatus for demodulating broadcasting signal comprises: the signal Synchronization device, be used for determining being contained in the correlation of data of frame synchronization field of the transmission frame of reception, and in response to the frequency of the correlation results synchronous transmission frame of determining and symbol regularly; Signal is reshuffled the unit, is used in response to correlation results, reshuffles at least one or a plurality of double-image signals based on a main signal, and its medium frequency and symbol are regularly comprised a described main signal and described one or more double-image signals by synchronous transmission frame; The DFT unit is used for transmission frame is carried out DFT, and described transmission frame is reshuffled the unit weighs configuration by signal; And equalizer, be used for the transmission frame that carries out the DFT processing through the DFT unit is carried out channel compensation.

Signal is reshuffled the unit and comprised: channel estimator is used for determining one or more main signals of transmission frame and at least one or a plurality of double-image signals in response to correlated results, and estimates the channel of transmission frame; Training signal removes device, is used for keeping in response to the channel estimator estimated channel frame body field of transmission frame, and removes training signal; Frame body field is reshuffled the unit, is used for reshuffling in response to the channel estimator estimated channel frame body field of transmission frame, and training signal is removed from described transmission frame.

Frame body field is reshuffled the unit and is extracted in related data in the frame body field of received double-image signals before the frame body field of main signal, and inserts related data at the frame body field afterbody of relevant double-image signals.Frame body field is reshuffled the related data that the unit is extracted in the frame body field of received double-image signals after the frame body field of main signal, and inserts related data at the frame body field head of relevant double-image signals.

Frame body field is reshuffled the unit and is comprised: reshuffle the field computing unit, be used for calculating in response to the channel estimator output signal field that will be reshuffled of the frame body field of double-image signals; Reshuffle dector, be used for extracting the pairing data of field of reshuffling the calculating of field computing unit in the frame body field of transmission frame, the training signal in the described transmission frame removes device by training signal and removes; Temporary storage, the frame body field of temporarily storing transmission frame, the training signal in the described transmission frame removes device by training signal and removes; Adder is used for and will be inserted in the frame body field of the transmission frame that temporary storage stores by reshuffling data that dector extracts.

In apparatus for demodulating broadcasting signal according to the application, can be by its frequency of conversion circularly and symbol regularly through the reception data of overcompensation, and carry out DFT, construct a kind of equalizer simply by compensate for channel.

Description of drawings

The disclosure illustrates by exemplary embodiment, and is not limited to the figure in the accompanying drawing, and wherein, identical reference number will be used to identify identical or similar parts in whole accompanying drawing.

Fig. 1 is the protection structural representation at interval of 1/9 frame main body for illustrating from the transmission frame of DTMB transmission, having size.

Fig. 2 is the block diagram of the configuration of the transmitter of explanation DTMB.

Fig. 3 is the block diagram of explanation according to receiver configuration among the DTMB of apparatus for demodulating broadcasting signal.

Fig. 4 is the schematic diagram of explanation by the transmission frame of receiver reception.

Fig. 5 is for reshuffling the method schematic diagram of unit cyclic transformation by data the frame body field of the transmission frame of receiver reception from conceptive explanation is a kind of by signal.

Fig. 6 reshuffles the block diagram of the structure of unit exemplary embodiment for the signal of explanation in apparatus for demodulating broadcasting signal.

Fig. 7 reshuffles the oscillogram of unit operations for explaining the signal in apparatus for demodulating broadcasting signal.

Fig. 8 is the block diagram that receiver structure is shown.

Fig. 9 is the block diagram that receiver structure is shown.

Embodiment

Described embodiment is only as explanation, and also unrestricted the present invention.The content of example is provided to help fully understand disclosed with reference to the accompanying drawings some exemplary embodiment in this explanation.Therefore, those of ordinary skills will be appreciated that, do not deviate under the situation of scope and spirit of claims, can carry out various variations and change to the exemplary embodiment of describing herein.Therefore the application is used for explaining principle and the notion that it is total in practical and the simplest mode.

Fig. 1 comprises the block diagram that from the transmission frame of DTMB transmission protection is spaced apart 1/9 frame for explanation.

With reference to Fig. 1, comprise the frame synchronization and the frame main body of data break from the transmission frame of DTMB transmission.

Frame synchronization comprises the PN sequence.The PN sequence utilization of using in the frame synchronization for example, but is not limited to the sequence of parameter m=8.Have only 255 bit streams to be present in the sequence of parameter m=8.Therefore, in the time will producing the protection interval of 1/9 frame main body size, the sign extended of afterbody is a preamble, and the sign extended of head is postamble has 420 symbols with generation a PN sequence.

For example, if frame main body has 3780 symbols, size is that the protection of 1/9 frame main body is formed by 420 symbols at interval.Like this, in order to produce 420 symbols by 255 symbols altogether, 50 sign extended of afterbody are preamble, and 155 sign extended of head are postamble.At this moment, preamble and postamble are the cyclic extensions of PN sign indicating number, and the phase place of response initial condition generation, and the PN sign indicating number correspondingly changes to 254 by 0.

Fig. 2 is the block diagram of the configuration of the transmitter of a DTMB of explanation.With reference to figure 2, in transmission equipment, Voice ﹠ Video (AV) signal (with the data that are transmitted) is by chnnel coding unit 200 codings.By the data of chnnel coding unit 200 chnnel codings input quadrature amplitude modulation (qam) unit 202, and be modulated into 4QAM a kind of among 16QAM or the 64QAM.

The amplitude and the phase place of QAM unit 202 conversion and modulation numerical datas of 200 inputs from the chnnel coding unit, like this through the data of chnnel coding whether be modulated to 4,16 or one of 64QAM depend on the number of coordinates that digital signal is dispersed into and is modulated into.

204 carry out contrary discrete Fourier transform (DFT) (IDFT) by the data of QAM unit 202 modulation through the IDFT unit, be converted to time domain data.In addition, (this PN sequence will be used to training signal to pseudo noise of PN generator 206 establishments for Pseudo-Noise, PN) sequence.

Multiplexing in the time domain datas of 204 outputs and the PN sequence inputoutput multiplexer 208 that produces by PN generator 206 from the IDFT unit, and by square root raised cosine (Square Root Raised Cosine, SQRC) filter 210 filtering are to limit its bandwidth.

Mixed with carrier signal (fc) in frequency mixer 212 by the transmission data of SQRC filter 210 filtering, and by on convert the radio frequency that bandwidth is 450～860MHz (RF) to, be sent out afterwards.

Fig. 3 is the block diagram of receiver configuration among the DTMB.

Now, with reference to figure 3, radio frequency (RF) bandwidth that tuner 300 receives by the transmitter emission is the transmission data of 450～860MHz.The data that received by tuner 300 are converted to digital signal by AD converter (ADC) 302, and frequency and symbol are regularly synchronous by digital synchronous device 304.

In other words, be divided into in-phase signal and orthogonal signalling by phase splitter 350, and the in-phase signal cut apart of input and orthogonal signalling are in multiplier 352 from the data of ADC 302 input.

Signal Synchronization device 304 mainly comprises three unit, 1. automatic frequency controller (AutomaticFrequency Controller, AFC) 360, be used for the compensating frequency mistake, 2. synchronizer 362 regularly is used for the PN sequence of synchronous transmitter emission, and 3. tracking cell 364 and resampler 354, be used to compensate symbol error, described symbol error is that analog signal is converted in the digital signal processes because sample rate is not produced simultaneously by transmitter and receiver.

Above-mentioned three kinds of operations are all realized by PN correlator 358 relevant results.In other words, PN correlator 358 is determined the correlation of PN sequence in the input data, and AFC 360 generates the AFC signal, be used for correlated results compensating frequency mistake as PN correlator 358, and the AFC signal that AFC 360 produces multiplied each other by multiplier 352 and in-phase signal and orthogonal signalling, be used for the compensating frequency mistake, described in-phase signal and orthogonal signalling are split by phase splitter 350.

Further, regularly the correlated results of synchronizer 362 response PN correlators 358 comes synchronic PN sequence, and tracking cell 364 control responses are in the resampler 354 of timing synchronizer 360 output signals, with the symbol error of offset data, described data are frequency compensated data of process of multiplier 352 outputs.

The data that the symbol error of resampler 354 has been compensated, after 356 filtering of SQRC filter, input PN correlator 358.As a result, response is determined the correlation of PN sequence from the data of SQRC filter 356 inputs by PN correlator 358.

Further, reshuffle in the unit 306, also import inlet signal via the signal of PN correlator 356 re-correlation and reshuffle in the unit 306 via the data input inlet signal of SQRC filter 356 filtering.Signal is reshuffled unit 306 response correlation results signals, removes from the frame synchronization field of the reception data of more than 356 route input of SQRC filter, and the frame body field of described reception data is changed to by reprovision has recurrence relation.

Reshuffle unit 306 at signal and remove the data that frame synchronization field and frame body field have recurrence relation and carry out DFT, so that the data of frame body field are converted to frequency domain data by DFT unit 308.Frequency domain data via 308 conversions of DFT unit by equalizer 310 compensate for channel, and outputs to channel decoder.

The apparatus for demodulating broadcasting signal of describing in the disclosure is through reshuffling, so that before equalizer 310 compensate for channel, frame body field is reshuffled at signal has the mutual circulation relation in the unit 308.

Receive by many routes by receiver from the broadcast singal of broadcasting station emission.For example, a part is directly received by receiver from the broadcast singal of broadcasting station emission, does not pass through ionospheric reflection, and another part broadcast singal is received by receiver behind ionospheric reflection.Like this, because being received machine through many different routes, the broadcast singal of broadcasting station emission receives the time of reception difference of the broadcast singal that different routes receive.

Carry out DFT if having the frame body field of a plurality of broadcast singals of different time of receptions by DFT unit 308, the zone that the frame body field of described different broadcast singal overlaps mutually can influence DFT.Like this, the data that convert frequency domain in 310 pairs in equalizer via DFT to are carried out in the channel compensation processing procedure, and channel response matrix can not be converted into diagonal matrix.As a result, inverse matrix must be calculated, and needs a large amount of hardware resources to be used for by equalizer 310 channel compensations.

In order to carry out in the channel compensation process at equalizer 310 channel response matrix is converted to diagonal matrix, the territory that the frame body field of described a plurality of broadcast singals overlaps mutually must be converted into the signal that has recurrence relation in the frequency domain.

Fig. 4 is the schematic diagram of explanation by the transmission frame of receiver reception.

With reference to figure 4, (a) and (b) and (c) in each signal can be preferably carry out the signal that frequency errors compensation and symbol timing error compensate by signal Synchronization device 304.Further, although these (a) and (b) and (c) signal receive by coupling, for convenience, these signals are according to channel separation.Simultaneously, the frame synchronization field in the transmission frame is removed, has only frame body field to illustrate out.

With reference to figure 4, (a) and (b) are the transmission frames that is received by different routes by receiver with each signal in (c).For example, signal (b) is the signal of high receiving intensity, signal (a) is to shift to an earlier date the double-image signals that the Lpre time receives, a little less than its receiving intensity than signal (b), signal (c) is to postpone the double-image signals that the Lpost time receives, a little less than its receiving intensity than signal (b), wherein signal (b) is called main signal, and signal (a) and signal (c) are hereinafter referred to as first double-image signals and second double-image signals.

When the frame body field of main signal was carried out the DFT processing by DFT unit 308, first and second double-image signals were because the influence that the data of frame synchronization field cause can obtain wrong DFT result.

Therefore, preferably, before the 308 pairs of main signals in DFT unit are carried out the DFT processing, remove the frame synchronization field of the first and the 3rd ghost image signal.

When the frame body field of main signal was carried out DFT, the region overlapping of main signal frame body field and the first and the 3rd ghost image signal frame body field can impact DFT result.As a result, carry out channel compensation if be converted to the signal of frequency domain by equalizer 310, then channel response matrix can not be converted to diagonal matrix.

For making channel response matrix be converted to diagonal matrix, if the signal that receives has been carried out DFT, preferably first double-image signals and the 3rd ghost image signal become the signal with recurrence relation in frequency domain based on the frame body field of main signal.

Fig. 5 is for reshuffling the method schematic diagram of unit cyclic transformation by data the frame body field of the transmission frame of receiver reception from conceptive explanation is a kind of by signal.

With reference to Fig. 5, signal is reshuffled unit 306 and is calculated the field that receives early than the main signal frame body field in the first double-image signals frame body field respectively, with the field that is later than the reception of main signal frame body field in the 3rd ghost image signal frame body field, so that equalizer 310 can be carried out channel compensation simply.

Then, the first and the 3rd ghost image signal is reshuffled according to the field of calculating so that first with the 3rd ghost image signal frame body field can be consistent in time with the main signal frame body field.

For example, calculate the field that receives early than the main signal frame body field in the first double-image signals frame body field, and field is as calculated added to the afterbody of the first double-image signals frame body field.Further, calculate and be later than the field that the main signal frame body field receives in the 3rd ghost image signal frame body field, and field is as calculated added to the head of the 3rd ghost image signal frame body field.

Afterwards, DFT unit 308 conversion main signal frame body field are frequency domain.Carry out channel compensation if 310 pairs in equalizer is converted to the signal of frequency domain, then can obtain diagonal matrix by channel response matrix, equalizer 310 can be carried out channel compensation simply in view of the above.

Fig. 6 reshuffles the block diagram of the structure of unit exemplary embodiment for a kind of signal in the explanation apparatus for demodulating broadcasting signal.

With reference to Fig. 6, the correlation results signal of exporting from PN correlator 358 is transfused to channel estimator.Channel estimator 600 response correlation results signals, estimate each channel by each transmission data of a plurality of different routes receptions, and the response estimated channel generates the control signal that is used to remove the control signal of training signal and is used to reshuffle each frame body field data.

For example, suppose that transmission frame is received by three routes shown in Fig. 7 a, Fig. 7 b and Fig. 7 c by receiver, the receiving intensity of one of them transmission frame is the highest.So, the transmission frame shown in Fig. 7 b is a main signal, and the transmission frame shown in Fig. 7 a and Fig. 7 c is the double-image signals transmission frame.

304 pairs of PN correlators are included in PN sequence in Fig. 7 a and the transmission frame shown in Fig. 7 c and carry out relevantly, and generate composite signal shown in Fig. 7 d.

Channel estimator 600 determines that by the amplitude of the correlation results signal that generates the transmission data shown in Fig. 7 b are main signal.And channel estimator 600 utilizes the correlation results signal to estimate each channel of transmission data, and response estimates that the channel generation is used to remove the control signal of training signal and generates the control signal that is used for reshuffling based on main signal the frame body field data.

Training signal removes device 610 responsive control signals, from the transmission frame that receives shown in Fig. 7 e and Fig. 7 g, remove the frame synchronization field, only extracting frame body field, and its incoming frame main body is reshuffled unit 620, described control signal is generated by channel estimator 600, is used to remove training signal.

Further, the control signal that is generated by channel estimator 600, be used to reshuffle the frame body field data is imported into frame main body and reshuffles unit 620.Frame main body reshuffle unit 620 comprise reshuffle field computing unit 622, reshuffle dector 624, temporary storage 626 and adder 628.Reshuffle the control signal of unit 620 responses, for example be used to reshuffle the control signal of frame body field data, calculate the field that is used to reshuffle frame body field from channel estimator 600 inputs.Reshuffle dector 624 according to the corresponding data of relevant field in field extraction of calculating and the frame body field that removes device 610 inputs from training signal.

The data that remove the frame body field of device 610 inputs from training signal are stored in temporary storage 626 temporarily, the data that temporarily are stored in the frame body field of temporary storage 626 are added on the data of reshuffling dector 624 extractions, to reshuffle frame body field by adder 628.

In other words, reshuffle dector 624 bases by reshuffling the field that field computing unit 622 calculates, extraction shown in Fig. 7 h and 7i, with the data of reshuffling, described data are during removing frame body field device 610 input, Fig. 7 e and Fig. 7 g from training signal.Further, the data that will be reshuffled of extraction are inserted in temporary storage 626 in frame body field storage, Fig. 7 e and Fig. 7 g by adder 618, and are reshuffled.

For example, the frame body field of the interim storage of temporary storage 626 outputs postpones a frame.When the temporary storage output delay during frame body field of one frame, the data of the respective field that dector 624 extracts are reshuffled in output.As a result, the frame body field among Fig. 7 e and Fig. 7 g is inserted by reconfiguration data, shown in Fig. 7 j and Fig. 7 k.

The frame body field data of reshuffling are like this carried out DFT by DFT unit 308, and input equalizer 310 is to carry out channel compensation.At this moment, channel response matrix is converted to diagonal matrix, and equalizer 310 can be realized inverse matrix simply and carry out channel compensation like this.

Fig. 8 is the block diagram of digital broadcasting transmitter structure.With reference to figure 8, digital broadcasting transmitter comprises tuner 701, demodulating unit 702, demodulation multiplexer 703, audio decoder 704, Video Decoder 705, local TV application manager 706, domain channel manager 707, channel map 708, first memory 709, data decoder 710, second memory 711, system administration manager 712, data broadcasting application manager 713, storage control 714 and the 3rd memory 715.Herein, the 3rd memory 715 is a mass-memory unit, for example can be hard disk drive (HDD) or memory chip.Tuner 701 is by the frequency of any the tuning specific channel in antenna, cable and the satellite.Tuner 701 is intermediate frequency (IF) with tuning frequency down-conversion, and this intermediate frequency outputs to demodulating unit 702 then.Thus, tuner 701 is by domain channel manager 707 controls.Result and intensity through the broadcast singal of tuning in to channels are also reported domain channel manager 707.The data that received by the frequency of tuning specific channel comprise master data, strengthen data and the master data and strengthen the table data of data of being used to decode.In the present embodiment, the example of master data can comprise voice data and video data.

A difference of master data and enhancing data is that the FEC that adds encodes.More precisely, additional FEC coding is applied to strengthen data, to strengthen this enhancing data.Simultaneously, then master data and the difference that strengthens data also in different types of data.

In the present embodiment, the example of the enhancing data that provide can be included as the data that data, services provides, for example Java application data, HTML application data, XML data or the like.The java class file that the data that provide for these data, services both can have been used corresponding to Java also can be corresponding to the catalogue file of the position of this file of indication.Further, the audio file and/or the video file of use during these data also can be used corresponding to each.Data, services can comprise weather forecast service, traffic-information service, the stock information service, the detecting information program service that provides the audience to participate in, ballot in real time, the then educational programs of user interactions, game services, service about the information of soap opera (or TV play) outline, role, original sound-track, archive site is provided, the service of sports tournament information is provided over, sportsman's archives and achievement, product information and product reservation service, provide the service of media broadcast programme information, the aviation moment, subject or the like.The type of the data, services of foregoing description is only as example but not be restricted to given example here.Further, according to embodiment, strengthen data and can be equivalent to metadata.For example, metadata adopts XML to use and passes through the DSM-CC protocol transmission.

702 pairs of signals from tuner 701 outputs of demodulating unit are carried out and are separated mediation channel equalization, thus identification master data and enhancing data.Afterwards, the master data of identification and enhancing data are with the output of TS bag unit.The example of demodulating unit 702 as shown in Figure 3.Demodulating unit shown in Fig. 3 is only as example, and the scope of the present disclosure is not limited to the example for enumerating here.In the execution mode that here provides, only the enhancing packet of demodulating unit 702 outputs is imported in the demodulation multiplexer 703.In this case, the master data bag is input to another demodulation multiplexer (not shown) of handling the master data bag.Herein, storage control 714 also is connected with another demodulation multiplexer, to store master data after handling the master data bag.Demodulation multiplexer also can be designed as to handle in single demodulation multiplexer and strengthens packet and master data bag.

Storage control 714 links to each other with demodulation multiplexer, with control instant recording, predetermined (or pre-programmed) record, and the time conversion, and other strengthen data and/or master datas.For example, one in instant record, predetermined (or pre-programmed) record and time conversion when the receiver shown in Fig. 8 (or receiving system) is set up and programmes, the control of response storage control 714, the relevant enhancing data and/or the master data of input demodulation multiplexer are stored in the 3rd memory 715.The 3rd memory 715 can be described as scratchpad area (SPA) and/or persistent storage.Here, the scratchpad area (SPA) is used for time switching function, and persistent storage is used for according to user's selection and the data of permanent storage.

When the data in being stored in the 3rd memory 715 need to reappear (or broadcast), storage control 714 reads the related data of storage in the 3rd memory 715, and the data that output is read are to relevant demodulation multiplexer (for example, the enhancing data output to demodulation multiplexer 703 as shown in Figure 8).Thus,, directly be stored in the 3rd memory 715 behind the enhancing data of input and/or the compressed coding of master data, and do not need it is changed to improve the efficient of memory capacity because the memory capacity of the 3rd memory 715 is restricted.In this case, according to reappearing (or reading) order, the data that read from the 3rd memory 715 are through demodulation multiplexer, being input to relevant decoder, thereby are reduced to initial condition.

Storage control 714 can be controlled reproduction (or broadcast), F.F., rewinding, slow motion, the instant replay function of the data that have been stored in the 3rd memory 715 or current buffering.Here, instant replay function is equivalent to repeat to watch spectators (or user) to think the picture of seeing once more.The instant replay function can be carried out the data of storage, also can be by in conjunction with instant replay function and time switching function the data of current real-time reception being carried out.If the data of input are corresponding to analog format, for example, if transmission mode is NTSC, PAL or the like, the data of storage control 714 compressed encodings inputs then, and store in compressed coded data to the three memories 715.Thus, storage control 714 can comprise encoder, and wherein encoder can be embodied as a kind of software, middleware or hardware.Herein, encoder can be mpeg encoder.Encoder also can be provided in the outside of storage control 714.

Simultaneously, be stored in the input data in the 3rd memory 715 in order to prevent bootlegging (or copy), the data that 714 pairs of inputs of storage control data are carried out scrambling and preserved scrambling are in the 3rd memory 715.Thereby storage control 714 can comprise and is used for scrambling at the scrambling algorithm of the data of the 3rd memory 715 storage be used for the Descrambling Algorithms of the data that descrambling reads from the 3rd memory 715.Here, the definition of scrambling comprises encryption, and the definition of descrambling comprises deciphering.Method for scrambling can comprise that use arbitrary key (for example, control word) to change desirable one group of data, can also comprise the method for mixed signal.

Simultaneously, demodulation multiplexer 703 receives from the real time data of demodulating unit 702 outputs, or the data that read from the 3rd memory 715, and the data that receive of demultiplexing.In the present embodiment, demodulation multiplexer 703 is carried out strengthening the demultiplexing of packet.Therefore, reception and the execution that strengthens data will be described in detail.It should be noted, the detailed description that relevant master data is handled, promptly from demodulation multiplexer 703 to after the description of unit, can be omitted to simplify.

Demodulation multiplexer 703 is in response to the control of data decoder 710, to strengthening data and showing to carry out demultiplexing from the program customizing messages/program and the system information protocol (PSI/PSIP) of the enhancing packet of importing.Afterwards, the enhancing data of demultiplexing and PSI/PSIP table outputs in the data decoder 710 with joint (section) form.Strengthen data in order from the channel that strengthens transfer of data, to extract, and the enhancing data of decoding and extracting, need system information.Such system information also can be called information on services.System information can comprise channel information, event information etc.In the present embodiment, the PSI/PSIP table is used as system information.Yet, be not limited to the example that these are enumerated.More precisely, do not consider name, can use any tabular protocol transmission system information.

PSI table is to be used for channel-identification and program and a kind of MPEG-2 system standard of defining.(it can channel-identification and program for Advanced Television Systems Committee, ATSC) standard for the advanced television standard committee for the PSIP table.The PSI table can comprise Program Association Table (ProgramAssociation Table, PAT), condition inserts table (Conditional Access Table, CAT), Program Map Table (Program Map Table, PMT) and network information table (Network InformationTable, NIT).Here, PAT is corresponding to by comprising that PID is the customizing messages of 0 data packet transmission.PAT transmission and the pid information of the corresponding NIT of each program and the pid information of PMT.CAT transmits the information of the employed payable broadcasts of relevant transmission system system.PMT transmission transmits the pid information of stream (TS), and wherein, the video of configuration respective program and each bit sequence and the identifier of voice data are transmitted, and also transmits the pid information that PCR wherein is sent out.NIT transmits the information of true transmission network.

The PSIP table can comprise: virtual channel table (Virtual Channel Table, VCT), system time table (STT), classification field list (Rating Region Table, RRT), expanded text table (ExtendedText Table, ETT), directly (Direct Channel Change Table is shown in the channel change, DCCT), Event Information Table (EIT), main guide tab (MGT).VCT transmits the information of relevant virtual channel, for example is used to select the channel information of channel and for example is used for receiving bag identification (Packet Identification, PID) number and so on the information of audio frequency and/or video data.More specifically, when VCT was resolved, the PID of the audio/video data of broadcast program can be known.Here, Xiang Guan audio/video data transmits in channel with channel name and channel.STT transmits the information of relevant current data and timing information.RRT transmits the advisory organization and the field of relevant program grade.ETT transmits the additional information of specific channel and broadcast program.EIT transmits the information of relevant virtual channel incident (for example, programm name, program zero-time etc.).The information that the DCCT/DCCSCT transmission follows automatically (or directly) channel to change.The MGT transmission is included in the version and the pid information of the above-mentioned table of mentioning among the PSIP.

Each that is included in table as described above among the PSI/PSIP disposed by the base unit that is called " joint ", and one or more joints be combined to form a table.For example, VCT can be divided into 256 joints.Here, a joint can comprise a lot of virtual channel information.Yet the single setting of virtual channel information is not divided into two or more joints.Thus, receiver can be resolved and decode and is used for the data of data, services, and described data can only be utilized the table that is included among the PSI, perhaps only utilizes the table that is included among the PSIP, or utilizes the combination that is included in the table among PSI and the PSIP to transmit.Be used for the data of data, services in order to resolve and to decode, need be included in PMT among the PSI and at least one of PAT, and need be included in the VCT among the PSIP.For example, PAT can comprise be used to send with the system information of the corresponding data of data, services and with the PID of the corresponding PMT of data service data (or program number).PMT can comprise the PID of TS bag, is used for the data of data service.VCT can comprise the virtual channel information of the data that are used for data service and be used for the PID of TS bag of the data of data service.

Simultaneously, according to embodiment, can use DVB-SI substituting PS IP.DVB-SI can comprise: network information table (NIT), service describing table (SDT), Event Information Table (EIT) and time and tables of data (TDT).DVB-SI can be used in combination with above-mentioned PSI.Herein, NIT divides the service of particular network provider by particular group.NIT comprises the whole tuning informations that use when IRD is provided with.NIT can be used for notifying any change of tuning information.SDT comprises Service name and the different parameters that combines with multiplexing corresponding each service of specific MPEG.EIT is used for transmitting and the relevant information of all incidents in the multiplexing generation of MPEG.EIT comprises relevant current information transmitted, comprises that also selectivity comprises the information of different transport stream, and described transport stream can receive by IRD.TDT is used for upgrading the clock that is included in IRD.

Further, can also comprise three optionally SI table (that is, and related bundle table (BouquetAssociate Table, BAT), Running Status Table (Running Status Table, RST) and ST Stuffing Table (Stuffing Table, ST)).More specifically, related bundle table (BAT) provides the service packet method, so that IRD can provide service to spectators.Each special services can belong at least one " bundle " unit.Running Status Table (RST) is saved and is upgraded at least one incident executing state in promptly and immediately.The executing state joint is only at the some transmission primaries of changing state-event.Other SI table is transmitted several times usually.ST Stuffing Table (ST) can be used for displacement or abandon supplementary table or whole SI table.

In the present embodiment, the enhancing data that are included in the interior payload of TS bag comprise digital storage media order and control (DSM-CC) section format.Yet, comprise that the TS bag of data service data can be corresponding to basic stream (Packetized Elementary Stream, PES) type or the joint type of packing.More specifically, PES categorical data service data configuration TS bag, or joint categorical data service data configuration TS bag.To provide the example of the TS bag that is configured to save categorical data in the disclosure.Thus, data service data comprises digital storage media order and control (DSM-CC) joint.Here, can be configured to the TS bag of 188 byte unit after the DSM-CC joint.

Further, the bag sign of the TS bag of configuration DSM-CC joint is included in the data, services table (DST).In transmission DST process, distributing ' 0x95 ' is the value of stream_type field, and described stream type field is included in the service position descriptor of PMT or VCT.More specifically, when the value of PMT or VCTstream_type field was ' 0x95 ', receiver can confirm to comprise that the data broadcasting that strengthens data (for example, strengthening data) is received.Strengthening data can be transmitted by datacycle (carousel) mode.The repeating of datacycle method and conventional principle transmitted same data and conformed to.

In response to the control of data demodulator 710, demodulation multiplexer 703 is carried out joint and is filtered, and abandoning the joint of repetition, and only exports the non-repetitive data demodulator 710 that saves.Demodulation multiplexer 703 also can only be exported the table that is used to dispose expectation by the joint filter, and (for example, joint VCT) is to data demodulator 710.Herein, VCT can comprise the particular descriptor that is used to strengthen data.Yet the present invention does not get rid of in other table and comprises the possibility that strengthens data, for example PMT.The joint filter method can be included in to be carried out before the joint filtration treatment, examines table (for example, PID VCT) by the MGT definition.Alternatively, when VCT comprises fixedly PID (for example, basic PID), the joint filter method also can directly be carried out joint and filter, and does not examine MGT.Thus, by reference table_id field, the version_number field, section_number field etc., demodulation multiplexer 703 is carried out the joint filtration treatment.

As mentioned above, the method for the PID of definition VCT roughly comprises two kinds of diverse ways.Here, the PID of VCT is the bag sign that needs from other table identification VCT.First method comprises the PID that VCT is set, and makes it depend on MGT.In this case, receiver can not directly be confirmed VCT from a lot of PSI and/or PSIP table.As an alternative, receiver must be checked the PID that defines among the MGT for reading VCT.Here, the PID of MGT definition different table, size, version number or the like.Second method comprises the PID that VCT is set, and makes PID provide with basic pid value (or fixedly pid value), thereby is independent of MGT.In this case, unlike first method, need not confirm that each the single PID that comprises among the MGT just can confirm VCT.Apparently, must between transmission system and receiver, carry out the negotiation of basic PID earlier.

Simultaneously, demodulation multiplexer 703 can be filtered by joint and only export application information table (AIT) to data demodulator 710.AIT comprises the information of application, and described being applied in the receiver operated, to be used for data, services.AIT also can be called as XAIT, and AMT.Therefore, any table of application message that comprises can meet following description.When AIT transmitted, a value for ' 0x05 ' was distributed to the stream_type field of PMT.AIT can comprise application message, for example apply names, application version, application priority, application ID, application state are (for example, automatically begin, the user specifies setting, cancellation etc.), application type (for example, Java or HTML), comprise position (or location), application platform index and the application icon position of the stream of application level and data file.

Adopting AIT to detect the method for the application message that is used for data, services, componet_tag (labelled component), original_network_id (source network sign), transport_stream_id (transport stream identification) and service_id (service identifiers) field can be used to detect application message.The component_tag field is specified the basic stream of the DSI that carries the related object circulation.The indication of original_network_id field provides the DVB-SI original_network_id of the TS of transmission connection.The indication of transport_stream_id field provides the MPEG TS of the TS of transmission connection, and the indication of service_id field provides the DVB-SI that transmits the service that connects.The information of specific channel can obtain by adopting original_network_id field, transport_stream_id field and service_id field.Adopt the data service data of the method detection of foregoing description, for example application data can be stored in the second memory 711 by data decoder 710.

Data decoder 710 is resolved the DSM-CC joint that the configuration demultiplexing strengthens data.Then, with analysis result strengthen accordingly data as database storage in second memory 711.Data decoder 710 will save grouping in a large number, and each comprises same table sign (table_id) in the described joint, is configured with his-and-hers watches, and it is resolved then.Afterwards, analysis result as database storage in second memory 711.Thus, by resolution data and/or joint, data decoder 710 reads all remaining real joint number certificates, and described joint number is according to not saving filtration through demodulation multiplexer 703.Then, data decoder 710 with the storage that reads in second memory 711.Second memory 711 is corresponding to table and the datacycle database of storing system information of resolving and the enhancing data of resolving from table from the DSM-CC joint.Here, be included in table_id field, section_number field and last_section_number field in the table, can be used to indicate corresponding table whether to be configured to single-unit or more piece.For example, the TS bag with PID of VCT is grouped with the joint that forms a joint, have the table identifier of distributing to VCT and is grouped to form described VCT.

When VCT is resolved, relevant strengthen transfer of data to the information of virtual channel can obtain.The application identifying information that obtains, serviced component identifying information and can be stored in second memory 711 with the corresponding information on services of data, services or output in the data broadcasting application manager 713.In addition, can be with reference to using identifying information, serviced component identifying information and information on services, with the decoded data service data.Alternatively, these information also can prepare to be used for the operation of the application program of data, services.Further, the demultiplexing of data decoder 710 control system information tables, the control table of described system corresponding to the information table of channel and event correlation.Afterwards, the A..V.PID tabulation can be transferred to domain channel manager 707.

Domain channel manager 707 can be consulted channel table 708, and data decoder 710 is arrived in the request that is used for the data of receiving system relevant information with transmission, thereby receives accordingly result.In addition, domain channel manager 707 also can be controlled the channel tuning of tuner 701.Further, domain channel manager 707 can directly be controlled demodulation multiplexer 703 so that A/V PID to be set, thus control audio decoder 704 and Video Decoder 705.Audio decoder 704 and Video Decoder 705 can decode respectively and export from the voice data and the video data of master data bag demultiplexing.Selectively, audio decoder 704 and Video Decoder 705 can decode respectively and export from strengthening the voice data and the video data of packet demultiplexing.Simultaneously, comprise data service data, when also comprising voice data and video data, apparently, decode by audio decoder 704 and Video Decoder 705 respectively by the voice data and the video data of demodulation multiplexer 703 demultiplexings when strengthening data.For example, audio decoder (AC)-3 decoding algorithm can be applied to audio decoder 704, and the MPEG-2 decoding algorithm can be applied to Video Decoder 705.

Simultaneously, local TV application manager 706 operates in the local application of storage in the first memory 709, to carry out the conventional func such as the channel change.Saved software in the receiver when in case local application is meant product export.More specifically, when user request (or order) by user interface (UI) when being transferred to receiver, local TV application manager 706 on screen by the request of graphical user interface (GUI) explicit user, to respond user's request.User interface receives user's request by input equipment, the touch screen that provides on remote controller, keyboard, fine motion controller (jog controller), the screen can be provided input equipment, afterwards, the user of output reception asks local TV application manager 706 and data broadcasting application manager 713.Further, local TV application manager 706 control domain channel manager 707, thereby control channel correlation are for example to the management of channel map 708 with to the control of data decoder 710.Local TV application manager 706 is also controlled the GUI of whole receivers, thus in first memory 709 storage user request and receiver state, and recover the information of being deposited.

Domain channel manager 707 control tuners 701 and data decoder 710 are with managing channel mapping 708, so that can respond user's channel request.More specifically, channel controller 707 transmit a request to data decoder 710 so that resolved with the table of channel association that will be tuning.The result of resolution table reports to domain channel manager 707 by data decoder 710.Afterwards, according to analysis result, domain channel manager 707 is upgraded channel map 708, and PID in the demodulation multiplexer 703 is set, and is used for from strengthening the table that the data demultiplexing is associated with data service data.

System administration manager 712 comes the startup of receiver control by power-on or powered-down.Like this, system administration manager 712 storage ROM images (comprising the downloaded software image) are in first memory 709.More specifically, first memory 709 storage management program, operating system (OS) program that for example is used to manage receiver, the also application program of storing execution data service function.Application program is to handle the program of the data service data of storage in second memory 711, to provide data, services to the user.If data service data is stored in the second memory 711, then related service data are handled by application program or other application program of foregoing description, thereby offer the user.Newly downloaded program can be upgraded or be corrected as to the hypervisor and the application program that are stored in the first memory 709.Further, even under the situation that system power supply is closed, the hypervisor of storage and application program can be retained and can be not deleted.Therefore, when power supply was provided, program can be carried out, and needn't download again once more.

Providing the application program of data, services according to present embodiment, can be that initial storage also can be to be stored in the first memory 709 after downloading in first memory 709 when dispatching from the factory according to receiver.The application program that is used for data, services (for example, data, services provides application program) that is stored in first memory 709 also can be deleted, upgrade and corrigendum.Further, when each data service data is received, provide the application program of data, services together to be downloaded and to carry out together with data service data.

When data service request was transmitted by user interface, data broadcasting application manager 713 operated in the related application of storage in the first memory 709, with the data of processing request, thereby offered the data, services that the user asks.For such data, services is provided, data broadcasting application manager 713 is supported graphical user interface (GUI).Herein, data, services can provide with the form of text (or Short Message Service (SMS)), speech message, still image and dynamic image.A platform that is used for carrying out in the application program of first memory 709 storages is provided for data broadcasting application manager 713.Platform can be a Java Virtual Machine of for example carrying out java applet.Hereinafter, will describe an example in detail, this example is that data broadcasting application manager 713 is carried out the application program that data, services is provided, described application storage is in first memory 709, so that handle the data service data of storing, provide related data to serve afterwards to the user at second memory 711.

The tentation data service is corresponding to traffic-information service, and data, services is with at least a user who offers the receiver that does not dispose electronic chart and/or gps system in text (or Short Message Service (SMS)), speech message, graphical messages, still image, the dynamic image.In this case, the GPS module is installed on as shown in Figure 8 the receiver, and the GPS module receives the satellite-signal that transmits from a plurality of low earth-orbit satellites, and (for example extracts current location information, longitude, latitude, height above sea level), thus the information that output is extracted is to data broadcasting application manager 713.

Thus, suppose to comprise that electronic chart about each link and dot information and other different graphic information is stored among second memory 711, first memory 709 and other memory that does not demonstrate one.More specifically, in response to the request that data broadcast application program manager 713 is made, the data service data that is stored in the second memory 711 is read, and is input to data broadcasting application manager 713.The data service data that data broadcasting application manager 713 translations (or deciphering) are read from second memory 711 is according to the contents extraction necessary information of message content and/or control signal.

Fig. 9 is the block diagram of digital broadcasting (or TV) receiver structure according to another embodiment.With reference to Fig. 9, digital broadcasting transmitter comprises: tuner 801, demodulating unit 802, demodulation multiplexer 803, first descrambler 804, audio decoder 805, Video Decoder 806, second descrambler 807, discriminating unit 808, local TV application manager 809, domain channel manager 810, channel map 811, first memory 812, data decoder 813, second memory 814, system administration manager 815, data broadcasting application manager 816, storage control 817, the 3rd memory 818 and remote communication module 819.The 3rd memory 818 is a mass storage device, for example hard disk drive (HDD) or memory chip.In the description process of digital broadcasting shown in Figure 9 (or TV, DTV) receiver, for clarity and conciseness, the assembly that is equal to the digital broadcasting transmitter of Fig. 8 will omit.

As above describe, in order to be provided for preventing bootlegging (or copy) or illegally to watch the enhancing data that adopt the radio network transmission and/or the service of master data, and for the payable broadcasts service is provided, transmission system usually can scrambling and transmission broadcasted content.Therefore, receiver needs descrambling and scrambled broadcast content, to offer the suitable content of user.Further, receiver can adopt identification device to differentiate processing before scramble process usually.Hereinafter, the receiver that comprises identification device and descrambler will be described in detail.

Receiver can provide descrambler, is used to receive the broadcasted content of scrambling, and identification device, is used for differentiating whether (or check) receiver has the right that receives scrambled content.Hereinafter, descrambler will be called first and second descrambler 804 and 807, and identification device will be called discriminating unit 808.These names are only as exemplary, but not are limited to the term of mentioning in the present embodiment.For example, also the unit can be named as decipher.Although Fig. 9 show descrambler 804 and 807 and discriminating unit 808 be provided at example in the receiver, descrambler 804 and 807 and each of discriminating unit 808 can be provided at separately in inside or the external module.Herein, module can comprise slot-type, and for example SD or CF memory also can be the memory stick type, and USB type or the like can be detachable and can additionally be configured on the receiver.

As mentioned above, when discriminating unit 808 successful execution discrimination processes, the broadcasted content of scrambling is by descrambler 804 and 807 descramblings, to offer the user.Thus, can adopt a variety of discriminatings and de-scrambling method here.Yet each corresponding method should be consistent on Receiver And Transmitter.Hereinafter, will describe and differentiate and de-scrambling method, for clarity and conciseness, will be omitted about the assembly that is equal to or the description of treatment step.

The first, will describe the receiver that comprises discriminating unit 808 and descrambler 804 and 807 in detail.Receiver receives the broadcasted content of scrambling by tuner 801 and demodulating unit 802.Then, system administration manager 815 judges that whether the broadcasted content that receives is by scrambling.Herein, demodulating unit 802 can comprise and the corresponding demodulating equipment of embodiment before.Yet present embodiment is not limited to the description of given example here herein.If system administration manager 815 is judged the broadcasted content that receives by scrambling, system administration manager 815 receiver control are moved described discriminating unit 808.As mentioned above, in order whether to judge receiver corresponding to the legal main frame that receives the payable broadcasts service, discriminating unit 808 is carried out discrimination process.Herein, according to discrimination method, discrimination process can be different.

For example, discriminating unit 808 can be by relatively the IP address of the IP datagram literary composition in the broadcasted content that receives and the particular address of associated host are carried out discrimination process.Thus, the particular address of correlation receiver (or main frame) can be MAC Address.More specifically, discriminating unit 808 can be extracted the IP address from the IP datagram literary composition of sealing off, thereby obtains the receiver information corresponding with the IP address.Thus, should provide information (for example, sheet format) and the receiver information that to shine upon the IP address to receiver in advance.Correspondingly, by determining the correlation receiver address and meet consistency between the receiver system information of IP address that discriminating unit 808 is carried out discrimination processes.In other words, if discriminating unit 808 determines that the information of these two types conforms to each other, then discriminating unit 808 definite receivers have the right to receive corresponding both related broadcast content.

In another example, Receiver And Transmitter defines the standard identifying information in advance.Then, the facility information of the receiver of request payable broadcasts service is transmitted by transmitter.Afterwards, receiver judges whether the identifying information that receives conforms to its exclusive identifier, to carry out discrimination process.More specifically, transmitter is created database, is used to store the identifying information (or number) of the receiver of asking the payable broadcasts service.Then, if both related broadcast content by scrambling, then transmitter comprises the identifying information among the EMM, is transferred to receiver after this information.

If both related broadcast content is by scrambling, then message (for example, using ECM (EntitlementControl Message, ECM), entitlement management message (Entilement Management Message, EMM)), CAS information for example, pattern information, message positional information, this class is applied to the message of scrambled broadcast content, is transmitted by related data head or other packet.ECM can comprise the control word (CW) that is used for the scrambled broadcast content.Herein, control word can adopt the authentication key coding.EMM can comprise the right information of authentication key and corresponding data.Here, authentication key can be the distributing key coding that adopts receiver specific.In other words, suppose to strengthen the scrambling of The data control word, and authentication information and descrambling information transmit by transmitter, then, transmitter adopts authentication key coding CW, and afterwards, the CW that comprises coding is in using ECM (ECM), and it is transferred to receiver.Further, transmitter comprises the authentication key of the CW that is used for encoding and receives the data (perhaps service) of receiver in entitlement management message (EMM) that right (for example, authorize the standardized sequence number of the receiver that receives relevant broadcast service or data), be transferred to receiver afterwards.

Correspondingly, the identifying information of the discriminating unit 808 extraction receivers of receiver and the just identifying information in received, as to be included in broadcast service EMM.Then, discriminating unit 808 determines whether identifying information is consistent with each other to carry out discrimination process.More specifically, if discriminating unit 808 determines that information are consistent with each other, then discriminating unit 808 is final determines the have the right broadcast service of the request that receives of receivers.

Yet in another example, the discriminating unit 808 of receiver detachable or can additionally dispose with external module on.In this case, receiver is connected with external module by common interface (CI).In other words, external module can receive data by the receiver scrambling by common interface, thereby carries out the scramble process that receives data.Selectively, external module also can only transmit the required information of scramble process to receiver.Common interface disposes physical layer and at least one protocol layer.Here, consider any possible protocol layer expansion in the subsequent treatment, the related protocol layer can be configured to comprise the layer that standalone feature can be provided at least.

External module can be to comprise memory, or have about the information that is used for the key that scrambling handles and other authentication information but do not comprise the card of any descrambling function, or have above-mentioned key information of mentioning and authentication information and comprise the card of descrambling function.Receiver and external module all should be differentiated, are provided the payable broadcasts service of (or transmission) by transmitter to offer the user.Therefore, transmitter can only provide the relevant payment broadcast service to receiver and the external module differentiated.

In addition, between receiver and external module, also should carry out and differentiate processing by common interface.More specifically, module can be communicated by letter with the system administration manager 815 in the receiver by common interface, thereby differentiates receiver.Selectively, receiver can pass through the common interface identification module.Further, in discrimination process, module can be extracted unique ID and its unique ID that controls oneself of receiver, and the ID that transmission is extracted is to transmitter.Like this, transmitter can use the ID value of transmission as the information that determines whether to begin institute's requested service, or as paying information.As long as need, system administration manager 815 arrives distance transmitter by remote communication module 819 transmission paying information.

Discriminating unit 808 is differentiated correlation receiver and/or external module.Then, if discrimination process completes successfully, then discriminating unit 808 proof correlation receivers and/or external module are valid system and/or authorize the module of serving with the payable broadcasts that receives request.In addition, discriminating unit 808 can also receive the relevant information of discriminating that the receiver user subscribes to from the mobile telecommunication service provider, replaces transmitter that the broadcast service of request is provided.In this case, differentiate that relevant information can be by the transmitter scrambling that broadcast service is provided, be transferred to the user by the mobile telecommunication service provider then, or directly by mobile telecommunication service provider scrambling and transmission.In case discrimination process is by discriminating unit 808 successful execution, the broadcasted content of the scrambling that can descrambling receives from transmitter of receiver then.Thus, the descrambling process is carried out by first and second descrambler 804 and 807.Herein, first and second descrambler 804 and 807 can be included in the internal module or the external module of receiver.

Receiver also provides common interface, to communicate by letter with 807 external module with comprising first and second descrambler 804, to carry out the descrambling process.More specifically, first and second descrambler 804 and 807 can be included in the module or in the receiver with the form of hardware, middleware or software.Here, in descrambler 804 and 807 any that can be included in module and the receiver.If provide first and second descrambler 804 and 807 in the receiver, be beneficial to very much and make transmitter (that is, ISP and broadcasting station at least any one) adopt same method for scrambling scrambling corresponding data.

Selectively, if first and second descrambler 804 and 807 are provided in the external module, are beneficial to very much and make each transmitter by adopting different scrambling method scrambling related data.In this case, receiver does not need to be provided with and the corresponding Descrambling Algorithms of each transmitter.Therefore, the structure of receiver and size can be simplified and be compacter.Correspondingly, in this case, external module itself can provide the CA function, and this function is only provided separately and uniquely by each transmitter, and external module also can provide and the relevant function of each service that will be provided for the user.Common interface makes a plurality of external modules that are included in the receiver intercom mutually by a kind of communication mode with system administration manager 815.Further, because receiver can be operated by connecting with at least one or a plurality of module that different services are provided, so receiver can be connected to a plurality of modules and controller.

In order to keep the success communication between receiver and external module, the common interface agreement comprises the function of the corresponding communicator state of periodic test the other side.By adopting this function, receiver and external module can be managed the state of the corresponding communicator of each the other side.Any fault that this function also may take place in any at receiver and external module to the report of user or transmitter, and attempt recovering fault.

In another example, discrimination process can be carried out by software.More specifically, when the storage card with CAS software of downloading in advance and be stored in wherein was inserted in the receiver, receiver received and reads CAS software from storage card, differentiated processing to carry out.In this example, CAS software is read from storage card, and is stored in the first memory 812 of receiver.Afterwards, CAS software is carried out as application program in receiver.Here, CAS software is installed (or storage) on middleware platform, and carries out.The Java middleware will provide as an example of middleware.Here, CAS software should comprise at least and is used to differentiate and handles required information and be used for the required information of scramble process.Therefore, discriminating unit 808 is between transmitter and receiver, and processing is differentiated in execution between receiver and storage card.Thus, aforesaid, storage card should receive related data, and should comprise the information of the relevant common receiver that can differentiate.For example, the information of relevant receiver can comprise unique number, for example the standardization sequence number of correlation receiver.Correspondingly, discriminating unit 808 relatively is contained in the standardization sequence number in the storage card and the unique information of receiver, to carry out discrimination process between receiver and storage card.

If CAS software is carried out in the Java middleware first, the discriminating between receiver system and the storage card is performed.For example, if the one number of the receiver of storing in storage card conforms to the one number of the receiver that reads from system administration manager 815, then storage card is verified, and confirms as the common memory card that can be used for receiver.Thus, CAS software can be when the disclosure is dispatched from the factory, and is installed on the first memory 812, or downloads on the first memory 812 from transmitter or module or storage card as mentioned above.Here, the descrambling function can be carried out as application program by data broadcasting application manager 816.

Afterwards, CAS software is resolved from the EMM/ECM bag of demodulation multiplexer 803 outputs, whether can receive corresponding data with the checking receiver, and (for example, CW), and the CW that acquisition is provided is to descrambler 804 and 807 thereby obtain the required information of descrambling.More specifically, from corresponding receiver, read unique (or sequence) number of receiver first at the CAS software of Java middleware platform operation, and with its with the one number of receiver by EMM transmission relatively, the related data thereby whether the checking receiver has the right to receive.In case the reception authority of receiver is verified, then is transferred to the corresponding broadcast service information of ECM and the authority of reception respective broadcast service and is used to verify whether receiver has the right to receive corresponding broadcast service.Have the right to receive the respective broadcast service in case receiver is verified as, the authentication key that then is transferred to EMM is used for the CW of decoding (or deciphering) coding, and described CW is transferred to ECM, thereby the CW of transmission decoding is to descrambler 804 and 807.Each descrambler 804 and 807 adopts CW descrambling broadcast service.

Simultaneously, the CAS software of storing in storage card can be expanded according to paid service, and described paid service is provided by the broadcasting station.In addition, except the information relevant with discriminating and descrambling, CAS software also can comprise other additional informations.Further, this receiver can be downloaded CAS software from transmitter, originally is stored in the CAS software of storage card with upgrading (or renewal).As mentioned above, no matter the type of broadcasting receiver, as long as external memory interface is provided, then the application can realize satisfying the cas system of the requirement of all types storage card, and described storage card can detachably or can additionally be configured on the receiver.Like this, present embodiment can realize the maximum performance of receiver with the cost of manufacture of minimum, and wherein receiver can receive the paying information content, broadcast program for example, thus understand and pay close attention to the variation of receiver.In addition, because only need minimum application programming interfaces to realize present embodiment, so manufacturing cost can be minimized, thereby eliminates the dependence to CAS manufacturer.Correspondingly, the manufacturing cost of CAS facilities and administration system also is minimized.

Simultaneously, descrambler 804 and 807 can be with example, in hardware, also can be to be included in the module with form of software.In this case, the scrambled data of reception is by the module descrambling, then by demodulation.And if just be stored in the 3rd memory 818 in received scrambled data, then receiving data can be saved by descrambling then, perhaps on the point that receives, be kept in the memory, and after broadcast (or reproduction) descrambling before.Afterwards, when being provided in scrambling/Descrambling Algorithms under the situation of storage control 817, storage control 817 scrambling is once more stored data to the three memories 818 of scrambling once more then just in received data.

In another example, the broadcasted content of descrambling (its transmission is limited) transmits by radio network.And in order to stop the reception restriction to related data, the information relevant with discriminating and data de-scrambling is by remote communication module 819 transmission and/or reception.Like this, receiver can carry out (or two-way) communication mutually.Receiver can transmit data to transmitter medium-long range communication module, or receiver can provide the data from the remote communication module in the transmitter.Here, data are transferred to transmitter corresponding to expectation or from the broadcast data of transmitter, and unique information (that is, identifying information), for example sequence number of receiving system or MAC Address.

The remote communication module 819 that is contained in receiver is provided at carries out the agreement that (or two-way) communication mutually needs between receiver, and described receiver is not supported mutual communication function, and remote communication module is contained in the transmitter.Further, receiver adopts tag-length-value (it comprises the data that will transmit and unique information (or, id information) for label length value, TLC) coding method configuration protocol data cell (PDU).Here, label field comprises the index of corresponding PDU.Length field comprises the length of value field.Value field comprises the True Data that will be transmitted and the one number (for example, identifier) of receiver.

Receiver can dispose the platform that the Java platform is housed, and moves this platform by the java application of network download transmitter behind receiver.In this case, the storage device download PDU from be contained in receiver and the PDU of transmission download then also are configured to the structure of remote communication module 819, and wherein said PDU comprises the label field that is defined arbitrarily by transmitter.And PDU is configured in can using at the Java of receiver, outputs to remote communication module 819 then.PDU also can be by following configuration: the unique information of transmission label value, the True Data that will transmit, the corresponding receiver used from Java and carry out TLC cataloged procedure in the receiver.The advantage of this structure is: even transmitter desired data (or application) is increased, also do not need to change the firmware of receiver.

The PDU that remote communication module in the transmitter receives from receiver by the radio data network transmission maybe will become to be transferred to the PDU of main frame by the data configuration that network receives.Thus, when configuration will be transferred to the PDU of main frame, the remote communication module in the transmission ends comprised the unique information (for example, IP address) of the transmission system that is positioned at remote location.In addition, receiving by radio data network and transmitting in the data procedures, receiver can have common interface, and WAP, CDMA 1x EV-DO arranged, it can pass through mobile telecommunication base station (for example CDMA or GSM) and connect, also have WLAN (wireless local area network) (LAN), mobile network, Wibro, Wimax, it can connect by access point.Above-mentioned receiver meets the system that is not equipped with telecommunications functions.Yet the receiver that is equipped with communication function does not need remote communication module 819.

By above-mentioned radio data network transmission and the broadcast data that receives, can comprise the data of carrying out restricting data receiving function needs.Simultaneously, demodulation multiplexer 803 receives from the real time data of demodulating unit 802 outputs, or receives the data that read from the 3rd memory 818, thereby carries out demultiplexing.In the present embodiment, demodulation multiplexer 803 is carried out the Xie Fuzhou that strengthens packet.Similarly process step is mentioned in description before.Therefore, for the sake of simplicity, the detailed process that demultiplexing strengthens data will be omitted.

The signal that first descrambler 804 receives from the demultiplexing of demodulation multiplexer 803, the signal of descrambling reception then.At this moment, first descrambler 804 can receive the identification result that receives from discriminating unit 808, also receives the data that other is used for the scramble process needs, to carry out scramble process.The signal that audio decoder 805 and Video Decoder 806 receive by first descrambler, 804 descramblings, decoded and output after the described descramble signal.Selectively, if first descrambler 804 is not carried out the descrambling process, audio decoder 805 and Video Decoder 806 direct decodings are also exported the signal that receives so.In this case, the signal of decoding is received and descrambling by second descrambler 807, and correspondingly processed.

Though only selected some embodiment that disclosure text is described, clearly, those skilled in the art therefrom can carry out various distortion and variation under the situation of the scope of the disclosure that does not deviate from claims definition.In addition, the aforesaid description of relevant embodiment only as an illustration, the claim that its purpose and unrestricted the present invention are appended and its are equal to replacement.Therefore, the application's scope is not limited to the disclosed embodiments.

Commercial Application

The frequency of the transmission frame that receives from DTMB and Symbol Timing be by synchronously, and transmission frame reshuffled, So that when balanced device was carried out channel compensation, channel response matrix can be converted to diagonal matrix, and was thus equal Weighing apparatus can easily be implemented inverse matrix and channel compensation.

Claims (12)

1. apparatus for demodulating broadcasting signal comprises: the signal Synchronization device, be used for determining being included in the data dependence in the frame synchronization field of transmission frame of reception, and the correlation results synchronous transmission frame rate determined of response and symbol are regularly; Signal is reshuffled the unit, is used to respond correlation results and reshuffles at least one or a plurality of double-image signals based on a main signal, and the transmission frame of its medium frequency and timing synchronization comprises a described main signal and described one or more double-image signals; Discrete Fourier transform (DFT) (DFT) unit carries out DFT to the transmission frame of being reshuffled the unit weighs configuration by signal; And equalizer, be used for the transmission frame of being carried out DFT by the DFT unit is carried out channel compensation.

2. apparatus for demodulating broadcasting signal as claimed in claim 1, wherein the data of frame synchronization field are pseudo noise (PN) sequence.

3. apparatus for demodulating broadcasting signal as claimed in claim 1, wherein main signal is the transmission frame of the amplitude of correlation results signal for maximum.

4. apparatus for demodulating broadcasting signal as claimed in claim 1, wherein the signal Synchronization device is divided into in-phase signal and orthogonal signalling with the transmission frame that receives, and the frequency of in-phase signal of dividing synchronously and orthogonal signalling and symbol timing.

5. apparatus for demodulating broadcasting signal as claimed in claim 1, wherein the signal Synchronization device comprises: correlator is used for determining the data dependence in the frame synchronization field of the transmission frame that receives; Automatic frequency controller (AFC), the correlation results signal that is used to respond correlator produces the AFC signal; Multiplier is used for the signal and the AFC signal multiplication of the transmission frame that will receive, with emending frequency; Synchronizer regularly is used to respond the data of correlation results signal Synchronization frame synchronization field; And tracking cell and resampler, the output signal that is used to respond regularly synchronizer compensates symbol error.

6. apparatus for demodulating broadcasting signal as claimed in claim 5 further comprises square root raised cosine (SQRC) filter, and the transmission data that frequency and symbol regularly have been corrected are carried out SQRC filtering.

7. apparatus for demodulating broadcasting signal as claimed in claim 5, wherein the data of frame synchronization field are the PN sequence, and correlator is the PN correlator, are used for determining the correlation of PN sequence.

8. apparatus for demodulating broadcasting signal as claimed in claim 1, wherein signal is reshuffled the unit and is comprised: channel estimator, be used for responding correlation results and determine, and estimate the channel of transmission frame in one or more main signals of transmission frame and at least one or a plurality of double-image signals; Training signal removes device, is used to respond the frame body field that is kept transmission frame by the channel estimator estimated channel, and removes training signal; Reshuffle the unit with frame body field, be used to reshuffle the frame body field of transmission frame, the training signal responsive channels estimator estimated channel of described transmission frame is removed.

9. apparatus for demodulating broadcasting signal as claimed in claim 8, wherein training signal is the data of frame synchronization field.

10. apparatus for demodulating broadcasting signal as claimed in claim 8, wherein said frame body field is reshuffled the related data that the unit is extracted in the frame body field of the double-image signals that receive before the frame body field of main signal, and related data is inserted the afterbody of the frame body field of relevant double-image signals; Described frame body field is reshuffled the related data that the unit is extracted in the frame body field of the double-image signals that receive after the frame body field of main signal, and related data is inserted the head of the frame body field of relevant double-image signals.

11. apparatus for demodulating broadcasting signal as claimed in claim 8, wherein said frame body field is reshuffled the unit and is comprised: reshuffle the field computing unit, the output signal that is used for the responsive channels estimator is calculated the field that will be reshuffled in the frame body field of double-image signals; Reshuffle dector, be used for being extracted in the frame body field of transmission frame with by reshuffling the corresponding data of field that the field computing unit calculates, the training signal of described transmission frame removes device by training signal and removes; Temporary storage is used for storing the frame body field of transmission frame temporarily, and the training signal of described transmission frame removes device by training signal and removes; And adder, be used for will reshuffle the data extracted of dector be inserted in the frame body field of the transmission frame that temporary storage stores.

12. apparatus for demodulating broadcasting signal as claimed in claim 11, the wherein said field computing unit calculated field of reshuffling, described field is used for reshuffling the field in the frame body field of the field of frame body field of the double-image signals that received and the double-image signals that receive after the frame body field of main signal before the frame body field of main signal.

Images