Summary of the invention
In order to address the above problem, the invention provides the vehicle-mounted DVB TV receiving system that a kind of user of being convenient to selects program, be one with the standard module collection in the DVB receiver, make the user can receive abundant in content audiovisual material, simultaneously, after the user is because of reason preference programs away from keyboard such as advertisements, can be according to the chained list of watching the number of times ordering by the user, select the favorite program channel of user fast, and switch to described favor program immediately to carry out content play, improved the efficient that the user is switched program, convenient for users to use.
According to an aspect of the present invention, the vehicle-mounted DVB TV receiving system that provides a kind of user of being convenient to select program comprises program selection module, in response to the switching command of TV user, according to the number of times that each program in the described digital television signal is selected by TV user, select program successively; The program handover module selects the program of module selection to switch to the corresponding data of program of selection according to described program, watches for TV user.
More specifically, the described user of being convenient to selects the vehicle-mounted DVB TV receiving system of program further to comprise: qam demodulator, by terrestrial television DVB-T channel receiving digital television signal, and the digital television signal that receives of QAM demodulation, the output two paths of signals is I road signal, Q road signal; Front end processing device, connect described qam demodulator to receive I road signal, Q road signal, and I road signal, Q road signal are carried out matched filtering arrive the operation that byte is shone upon with equilibrium, differential coding and symbol, the byte that output is corresponding with the qam symbol that I road signal, Q road signal map obtain; Convolutional deinterleaver connects described front end processing device receiving the byte of its output, and the byte that receives is carried out the degree of depth is that 12 convolution deinterleaves the error protection bag after the output convolution deinterleaves; The RS decoder connects described convolutional deinterleaver, and the error protection bag that receives is carried out RS(204,188) decode, export the packet of 188 bytes, the packet of described 188 bytes is the transport stream TS stream of the MPEG-2 of Motion Picture Experts Group frame structure; Sync byte counter-rotating with go randomisation means, connect described RS decoder, with the TS diffluence randomization of MPEG-2 frame structure, and will go the sync byte SYNC1 byte in the TS stream after the randomization to reverse; Deplexing apparatus, connect described sync byte counter-rotating and go randomisation means, TS stream after receiving the also described sync byte counter-rotating of demultiplexing and going randomisation means counter-rotating sync byte SYNC1 byte, outputting audio data TS stream, video data TS stream, additional data TS stream, Program Association Table PAT, Program Map Table PMT and service description list SDT, described voice data TS stream, video data TS stream, additional data TS stream, Program Association Table PAT, Program Map Table PMT has different Packet Identifier PID with service description list SDT, described PID is the be responsible for assigning identifier of different value of different types of data in the TS stream, described additional data comprises the data of independently data service, also comprises and described audio content, the data that described video content is relevant; The programme information parsing module, connect described demultiplexing module to receive described Program Association Table PAT, Program Map Table PMT and service description list SDT, obtain the PID of each program in the described digital television signal according to Program Association Table PAT, from described Program Map Table PMT, obtain the PID of PID, additional data TS stream of PID, the video data TS stream of each program corresponding audio data TS stream according to the PID of each program, from described service describing table SDT, obtain the programm name of each program according to the PID of each program; The programme information memory module, connect described programme information parsing module, to obtain the programme information of each program, the programme information of described each program comprises the PID of PID, additional data TS stream of PID, video data TS stream of programm name, each program corresponding audio data TS stream of PID, each program of each program, and stores the programme information of each program with the chain sheet form according to the acquisition order; The program information management module, connect described programme information memory module, after selecting program each time, TV user triggers the ordering of the programme information of the chain sheet form in the described programme information memory module, the rule of described ordering is selected the number of times of program for the user, wherein the user selects the programme information of the maximum program of number of times to deposit the head node of described chained list in, the user selects the programme information of the program of least number of times to deposit the tail node of described chained list in, and the user selects the programme information of the identical program of number of times to sort in described chained list according to the acquisition order; Program is selected module, connect described program information management module, begin to travel through in response to switching command head node from described chained list of user and select program that the user need watch as the switching target program the program of described chained list with the programme information correspondence that deposited in from described each node of chained list, and obtain the programme information of described switching target program; The program handover module, connect described program and select module and described Deplexing apparatus, be used for current program is switched to the switching target program that described program selects module to select, and play at switching target program corresponding audio data described in the described Deplexing apparatus output data, video data and additional data; Wherein, described program handover module switches to described program with current program and selects the switching target program of module selection to comprise, stop current program corresponding audio data TS stream, video data TS stream, decoding and the broadcast of additional data TS stream, PID according to the switching target program corresponding audio data TS stream of selecting module to obtain from described program, the PID of video data TS stream, the PID of additional data TS stream filters acquisition and described switching target program corresponding audio data TS stream from the output data of described Deplexing apparatus, video data TS stream, additional data TS flows to decode and play.
More specifically, the described user of being convenient to selects the vehicle-mounted DVB TV receiving system of program further to comprise: wherein, described TS stream is made up of packet header and load, described packet header comprises a sync byte SYNC1 and three other bytes, described three other bytes are used for traffic identification, scrambling and control information, described load comprises the MPEG-2 data of 184 bytes, specifically being distributed as of three other bytes in described TS stream packet header, 1 transmission error code indication bit position, 1 net amount is according to initial indication bit position, unit, 1 is transmitted the priority bit position, 13 bag identifier PID bits, 2 are transmitted scrambling control bit position, control bit position, 2 self adaptation districts and 4 continuous counter bits.
More specifically, the described user of being convenient to selects the vehicle-mounted DVB TV receiving system of program further to comprise: use to comprise that the audio frequency and video playing module of loud speaker and LCDs selects program corresponding audio data and video data to play to the user, described loud speaker is the left and right acoustic channels loud speaker, and the resolution of described LCD is any one in 160 * 128,384 * 320,640 * 480 or 1024 * 600.
More specifically, the described user of being convenient to selects the vehicle-mounted DVB TV receiving system of program further to comprise: described vehicle-mounted DVB TV receiving system is fixed in the automobile car, maybe can watch for TV user in the automobile car is hand-held.
Embodiment
Select the embodiment of the vehicle-mounted DVB TV receiving system of program to be elaborated to the user of being convenient to of the present invention below with reference to accompanying drawings.
Fig. 1 illustrates the block diagram that the user selects the vehicle-mounted DVB TV receiving system of program of being convenient to that illustrates according to an embodiment of the present invention.Wherein be used to user vehicle to provide the user of being convenient to of DVB TV service to select the vehicle-mounted DVB TV receiving system of program to comprise, quadrature amplitude modulation qam demodulator 1, front end processing device 2, convolutional deinterleaver 3, reed-solomon RS decoder 4, sync byte reverse and remove randomisation means 5, Deplexing apparatus 6, handle to obtain the data of each program correspondence in the digital television signal to receiving digital television signal successively; Program is selected module 10, in response to the switching command of TV user, according to the number of times that each program in the described digital television signal is selected by TV user, selects program successively; Program handover module 11 connects described program and selects module 10 and described Deplexing apparatus 6, and the program of selecting module 10 to select according to described program switches to the data of program correspondence of the selection of described Deplexing apparatus 6 outputs, watches for TV user.Further, described vehicle-mounted DVB TV receiving system also comprises, qam demodulator 1, and by terrestrial television DVB-T channel receiving digital television signal, and the digital television signal that receives of QAM demodulation, the output two paths of signals is I road signal, Q road signal; Front end processing device 2, connect described qam demodulator 1 to receive I road signal, Q road signal, and I road signal, Q road signal are carried out matched filtering arrive the operation that byte is shone upon with equilibrium, differential coding and symbol, the byte that output is corresponding with the qam symbol that I road signal, Q road signal map obtain; Convolutional deinterleaver 3 connects described front end processing device 2 receiving the byte of its output, and the byte that receives is carried out the degree of depth is that 12 convolution deinterleaves the error protection bag after the output convolution deinterleaves; RS decoder 4 connects described convolutional deinterleaver 3, and the error protection bag that receives is carried out RS(204,188) decode, export the packet of 188 bytes, the packet of described 188 bytes is the transport stream TS stream of the MPEG-2 of Motion Picture Experts Group frame structure; Sync byte counter-rotating with go randomisation means 5, connect described RS decoder 4, with the TS diffluence randomization of MPEG-2 frame structure, and will go the sync byte SYNC1 byte in the TS stream after the randomization to reverse; Deplexing apparatus 6, connect described sync byte counter-rotating and go randomisation means 5, TS stream after receiving the also described sync byte counter-rotating of demultiplexing and going randomisation means 5 counter-rotating sync byte SYNC1 bytes, outputting audio data TS stream, video data TS stream, additional data TS stream, Program Association Table PAT, Program Map Table PMT and service description list SDT, described voice data TS stream, video data TS stream, additional data TS stream, Program Association Table PAT, Program Map Table PMT has different Packet Identifier PID with service description list SDT, described PID is the be responsible for assigning identifier of different value of different types of data in the TS stream, described additional data comprises the data of independently data service, also comprises and described audio content, the data that described video content is relevant; Programme information parsing module 7, connect described demultiplexing module 6 to receive described Program Association Table PAT, Program Map Table PMT and service description list SDT, obtain the PID of each program in the described digital television signal according to Program Association Table PAT, from described Program Map Table PMT, obtain the PID of PID, additional data TS stream of PID, the video data TS stream of each program corresponding audio data TS stream according to the PID of each program, from described service describing table SDT, obtain the programm name of each program according to the PID of each program; Programme information memory module 8, connect described programme information parsing module 7, to obtain the programme information of each program, the programme information of described each program comprises the PID of PID, additional data TS stream of PID, video data TS stream of programm name, each program corresponding audio data TS stream of PID, each program of each program, and stores the programme information of each program with the chain sheet form according to the acquisition order; Program information management module 9, connect described programme information memory module 8, after selecting program each time, TV user triggers the ordering of the programme information of the chain sheet form in the described programme information memory module, the rule of described ordering is selected the number of times of program for the user, wherein the user selects the programme information of the maximum program of number of times to deposit the head node of described chained list in, the user selects the programme information of the program of least number of times to deposit the tail node of described chained list in, and the user selects the programme information of the identical program of number of times to sort in described chained list according to the acquisition order; Program is selected module 10, connect described program information management module 9, begin to travel through in response to switching command head node from described chained list of user and select program that the user need watch as the switching target program the program of described chained list with the programme information correspondence that deposited in from described each node of chained list, and obtain the programme information of described switching target program; Program handover module 11, connect described program and select module 10 and described Deplexing apparatus 6, be used for current program is switched to the switching target program that described program selects module 10 to select, and play at switching target program corresponding audio data described in the described Deplexing apparatus 6 output data, video data and additional data; Wherein, described program handover module 11 switches to described program with current program and selects the switching target program of module 10 selections to comprise, stop current program corresponding audio data TS stream, video data TS stream, decoding and the broadcast of additional data TS stream, PID according to the switching target program corresponding audio data TS stream of selecting module 10 to obtain from described program, the PID of video data TS stream, the PID of additional data TS stream filters acquisition and described switching target program corresponding audio data TS stream from the output data of described Deplexing apparatus 6, video data TS stream, additional data TS flows to decode and play.
Wherein, chained list (Linked list) is a kind of common basic data structure, is a kind of linear list, but can't be by the sequential storage data of linearity, but deposits the pointer (Pointer) of next node in each node.Owing to needn't store in order, chained list when inserting than another kind of linear list: sequence list is faster, but the node of searching a node or visit particular number then needs more time.Use list structure can overcome the shortcoming that array linked list need be known size of data in advance, list structure can take full advantage of the calculator memory space, realizes internal memory dynamic management flexibly.But chained list has lost the advantage that array reads at random, and chained list is owing to increased the pointer field of node simultaneously, and space expense is bigger.In computer science, chained list can be used for generating the data structure of other type as a kind of data structure of basis.Chained list is made up of a succession of node usually, and each node comprises instance data arbitrarily and one or two and is used to refer to upwards one/or the link of the position of next node.The most tangible benefit of chained list is exactly, and the mode that conventional array is arranged associated item may be different from these data items order on memory body or disk, and the access of data often will be in the different middle conversions that puts in order.And chained list is a kind of self-designation data type, because he comprises the pointer (link) of the data of pointing to another same type.Chained list allows to insert and removes table goes up any locational node, but does not allow arbitrary access.Chained list has various type: single-track link table, doubly linked list and circular linked list.Chained list can be realized in multiple programming language.Access and the operation of chained list have just been comprised in the bist data type of the language as Lisp and Scheme.Program language or object oriented language, as C, C++ and Java rely on variable instrument to become chained list next life.
Wherein, similar with other modulation system, QAM is by the variation transmission information of some parameter of carrier wave.In QAM, data-signal is represented by the changes in amplitude of two mutually orthogonal carrier waves.The phase place modulation of analog signal and the PSK of digital signal can be considered to amplitude special quadrature amplitude modulation constant, that only have phase place to change.Thus, frequency analog signal modulation and digital signal FSK also can be considered to the special case of QAM, because they are exactly the phase place modulation in essence.Be similar to other digital modulation modes, QAM transmits and collects and can represent easily with planisphere.Each constellation point correspondence concentrated signal that transmits on the planisphere.If the collection size that transmits of quadrature amplitude modulation is to be referred to as N-QAM.Constellation point often adopts level and the equally spaced square mesh configuration of vertical direction, and other configuration mode is also arranged certainly.Data often adopt binary representation in the digital communication, and the number of constellation point generally is 2 power in this case.Common QAM form has 16-QAM, 64-QAM, 256-QAM etc.Number of constellation points is more many, and each symbol energy information transmitted amount is just more big.But, if under the situation that the average energy of planisphere remains unchanged, increase constellation point, the distance between the constellation point is diminished, and then cause the error rate to rise.Therefore the reliability of high-order planisphere is than low order difference.
Wherein, Digital Television is different fully with the mode that the traditional analog television program is selected, and the corresponding program of each channel of traditional tv as long as be transferred to corresponding frequency, just can be seen program.And in digital television signal, the corresponding multi-channel program of one road code stream uses multiplex technique just can accomplish.The channel of a physics can only provide the road transport stream that comprises multi-channel program.Watch a certain road program wherein, also must from this transport stream, extract the compressed package of this road program, and then decode.So how from numerous transport stream, choose one road program to play, just become very complicated.In the transport stream of MPEG-2, program specific information PSI(Program Specific Information), be exactly how heterogeneity in the different programs of regulation and the program is multiplexed into a unified code stream.Be the formation that the basis can provide a code stream with PSI, thereby help the user that program is selected.Information on services SI(Service Information among the DVB) then this is carried out further expansion, added some to user's Useful Information, indicated the type of program, service provider, the correlation of program etc.
In addition, the described user of being convenient to selects the vehicle-mounted DVB TV receiving system of program further to comprise: wherein, described TS stream is made up of packet header and load, described packet header comprises a sync byte SYNC1 and three other bytes, described three other bytes are used for traffic identification, scrambling and control information, described load comprises the MPEG-2 data of 184 bytes, specifically being distributed as of three other bytes in described TS stream packet header, 1 transmission error code indication bit position, 1 net amount is according to initial indication bit position, unit, 1 is transmitted the priority bit position, 13 bag identifier PID bits, 2 are transmitted scrambling control bit position, control bit position, 2 self adaptation districts and 4 continuous counter bits.
Wherein, the full name of TS then is Transport Stream.MPEG2-PS is mainly used in the fixedly program of duration that has of storage, and as the DVD film, MPEG-TS then is mainly used in the program of real-time transmission, such as the TV programme of broadcasting in real time.The main distinction of these two kinds of forms is, if the front one of the vob file on the DVD is cut (perhaps simply being exactly corrupted data), will cause whole file to decode so, and TV programme is whenever to turn on television set can both decode (watching), so to be exactly requirement begin all can independently decode from arbitrary fragment of video flowing the characteristics of MPEG2-TS form.
In addition, the described user of being convenient to selects the vehicle-mounted DVB TV receiving system of program further to comprise: use to comprise that the audio frequency and video playing module of loud speaker and LCDs selects program corresponding audio data and video data to play to the user, described loud speaker is the left and right acoustic channels loud speaker, and the resolution of described LCD is any one in 160 * 128,384 * 320,640 * 480 or 1024 * 600.Manufacturer can carry out the selection of loud speaker and the display of different brands, different parameters according to user's economic capability and use needs.
Wherein, the image display parameters of display comprises screen intensity, contrast and colourity.The brightness of television set is the brightness of television screen just, refers to the bright degree of accessible maximum under the whole white picture, and unit is every square metre of candela, and the brightness of LCD TV is to have backlight to provide, and plasm TV then is self luminous.When the contrast of television set refers to that this TV is the brightest (also can be described as white picture) ((ratio of picture, this value is more big, just we can say that the color of TV is more gorgeous also to can be described as the black picture when the darkest.But we are when watching TV, and contrast neither be the bigger the better.Contrast can make image level reduce too by force, seems stiff, loses many image details.Contrast is transferred lowly excessively, and image level is reduced, and seems to require great effort very much, will not pursue high-contrast simply according to user's oneself vision hobby so how to regulate also.Color is made up of brightness and colourity, and colourity then is not comprise brightness in the character of interior color, and what he reflected is the color harmony saturation of color.So also can just regard colourity as color saturation.
In addition, the described user of being convenient to selects the vehicle-mounted DVB TV receiving system of program further to comprise: described vehicle-mounted DVB TV receiving system is fixed in the automobile car, maybe can watch for TV user in the automobile car is hand-held.Like this, according to user's actual needs, can use this vehicle-mounted DVB TV receiving system flexibly, avoid waiting not good car occupant the watching the DVB digital television program of viewing location as back row.
Adopt the user of being convenient to of the present invention to select the vehicle-mounted DVB TV receiving system of program, for originally simple in structure, the vehicle-mounted DVB TV receiving system of function singleness has increased each functional module of the DVB-T of standard, audio frequency that can a plurality of programs of round Realization, video, the reception of other data such as captions and broadcast, simultaneously, can't fast return arrive the technical problem of having a preference for program at the user, a kind of linked list data structure has been proposed, select number of times in chained list, to sort according to the user program, and supply the user of switching program to select to switch, thereby shortened the time of returning the user's preferences program, improved the operating efficiency of system.
Be understandable that though the present invention with the preferred embodiment disclosure as above, yet above-described embodiment is not in order to limit the present invention.For any those of ordinary skill in the art, do not breaking away under the technical solution of the present invention scope situation, all can utilize the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention according to any simple modification, equivalent variations and the modification that technical spirit of the present invention is done above embodiment, all still belongs in the scope of technical solution of the present invention protection.