CN1420689A - Digital TV channel transformation control devcie - Google Patents

Abstract

A control device of channel switch for digital TV set is composed of coding part to code the video, audio and data according to the compression specification of colour image, information packet compression part to compress the structural data of basic information received by the coding part into the basic information of information packet, multifunctor to optimize the audio, video and data received by the compression part, modulating part to recompress and modulate the information packet received from the mutifunctor, amplifying part to modulating part, transmitting part to transmit the signal of amplifying part, receiving part to receive the signal transmitted by the transmitting part,counter-modulating part to counter-modulate the input signal received by the receiving part, multiple distributor to separate video, audio and data by utilizing the identification character of information packet, and recovery part.

Description

Digital TV channel conversion control apparatus (PPARATUS FOR VERSION CONTROL OF DIGITAL TELEVISION)

Technical field

The present invention relates to the digital TV channel control device, emphaticallyed point out (Master Guide Table by master control tabulation MGT, below represent with MGT) (master control tabulation) manage and control direct channel conversion table DCCT (Directed Channel Change Table, below represent with DCCT) (directly channel conversion table) and directly select channel code table DCCSCT (Directed ChannelChange Selection Code Table, below represent with DCCSCT) conversion of (directly selecting the channel code table), the tabulation of master control just MGT content comprises direct channel conversion table DCCT and directly selects channel code table DCCSCT, and realize DCCT and DCCSCT transformation manager by master control tabulation MGT, improve the Digital Television receiving efficiency and effectively support TV station to be the direct channel conversion DCC of televiewer (Directed Channel Change, below represent) service thereby reach with DCC.

Background technology

At first, so-called directly channel conversion DCC, when being exactly the audiovisual Digital Television, the audiovisual spectators preestablish the words of oneself liking several programs of seeing, want that the program of seeing need not go to search also one by one and can audiovisual satisfy the program that imposes a condition in advance, that is to say, realize above-mentioned purpose by automatic change channel.Design content of the present invention meets agreement ATSC (the Advanced Television Systems Committee of high-altitude ripple and cable Digital Television, below represent with ATSC) specification PSIP (Program and System Information Protocol, below the represent) lattice of establishing rules really with PSIP.In direct channel conversion DCC (Document) data 508, outside the base table of PSIP, increased definition to two new tables of DCCT and DCCSCT.Wherein, the DCCT table tells which kind of channel when has which kind of condition is automatically converted to from which kind of channel.DCCSCT (Categorical Selection Code) table is to have unconditional option code and the value corresponding with it that satisfies the channel conversion condition, thereby provides the selection code table that meets audiovisual spectators requirement to the audiovisual spectators.Have in the DCC Digital Television of DCC function, at first, the receiver of Digital Television receives behind the DCCSCT and with its content and is shown to the audiovisual spectators, program during the audiovisual spectators select to show according to option code, the program that i.e. education, film and news etc. are liked oneself is then in advance to the television set setting.

As the above, this installs automatic channel change and satisfies the condition that the audiovisual spectators choose in advance, and provides DCC function to the audiovisual spectators.DCCT and DCCSCT are that several tables as PSIP have channel digit, and this is to mean for the channel of DCC option code and conversion and time content such as also have ready conditions can allow to change.

Simultaneously, two important tables that the receiver channel conversion of Digital Television is relevant, promptly DCCT table and DCCSCT table will often contrast new channel change content, all tables that can change the PSIP of channel content are to manage by the sublist of MGT, and give digital television function with the content feed of conversion.

But the current present situation of operating old technology as mentioned above is the sublist that DCCT and DCCSCT are not defined as MGT.Therefore, for new conversion ascending order table to DCCD and DCCSCT, so can not manage the receiver of the conversion Digital Television of DCCT and DCCSCT often monitors by transmitting chip (TP:TransPort) by MGT) channel conversion of DCCT and DCCSCT is whether, therefore, exist the problem that reduces the Digital Television performance.

Summary of the invention

The present invention puts forward for the problem that solves above-mentioned existence.Concrete solution is the receiver of Digital Television, comprises DCCT and DCCSCT in master control tabulation MGT content, two tables relevant with channel conversion, i.e. and the transformation manager of DCCT table and DCCSCT table is undertaken by the master control MGT that tabulates.Therefore improved the receiver system efficient of Digital Television, effectively supported that TV station is audiovisual spectators DCC service simultaneously.The present invention provides the digital TV channel conversion control apparatus for this reason.

Form by following part in order to reach aforesaid purpose: the encoding section that forms the essential information structure after the MPEG specification of video, audio frequency and data based the International Organization for Stand ISO (International Organization for Standardization the International Organization for Stand) and the International Electrotechnical Commi IEC (the international electrical standard meeting of International ElectrotechnicalCommission) is encoded; Press flat type for the data of essential information (essential information: represent with the essential information Elementary Stream below) state that receives from encoding section and manage the packets of information compression unit of compressed information bag essential information; For effectively transmitting input signal video, audio frequency and data packets essential information (the PES:Packetized ElementaryStream that receives from the packets of information compression unit, below represent) with the packets of information essential information, form the transmission packets of information (Transport Packet) of 188 byte-sized and the multi-function device that transmits to the receiver of Digital Television, from the input transfer packets of information that multi-function device receives, the modulation portion of compressing again and modulating; After amplifying, signal from modulation portion is sent to the RF amplifier of the portion of delivering letters; Transmit the transport part of RF amplifier signal; The acceptance division that transmits behind the receiving digital broadcast signal of above-mentioned transport part; The demodulation section that the information that receives from acceptance division is carried out demodulation; From the transmission information that demodulation section receives, utilize packet identifier video, audio frequency and data to be separated the multichannel frequency divider of transmission; But from compressive state, restore the packets of information recovery portion of back by picture and loud speaker audiovisual digital broadcasting etc., the compositing characteristic that Here it is installs from multichannel frequency divider video, audio frequency and data message by compression.

Good effect of the present invention is: two important tables that channel conversion of the present invention is relevant, be DCCT table and DCCSCT table, realize the channel conversion management by the main table MGT that excavates, reduce monitoring form simultaneously, improve the performance of the receiver system microprocessor of Digital Television, correct is audiovisual spectators DCC service, thereby gets a desired effect.

Description of drawings

Fig. 1 shows the channel conversion control device composition frame chart of the present invention by the Digital Television of master control tabulation MGT;

Fig. 2 is the enforcement figure that shows packets of information multi-function device action of the present invention

Fig. 3 is this displaying packets of information demultplexer of the present invention enforcement figure.

The explanation of major part symbol among the figure

The 10:MPEG encoding section; 20: the packets of information compression unit;

30: multi-function device; 40: modulation portion;

The 50:RF enlarging section originally; 60: the transport part;

70: acceptance division; 80: counter modulation portion;

90: demultplexer; 100: packets of information recovery portion.

Embodiment

Below, the effect and the effect of the channel conversion control device of Digital Television is described in detail as follows with reference to accompanying drawing:

Fig. 1 shows the block diagram of the present invention with the channel conversion control device formation of the Digital Television of master control tabulation MGT.As shown in the figure, video, audio frequency and data are encoded according to MPEG (motion picture experts group) agreement form the mpeg encoded portion (10) of essential information structure; For the data of the essential information structure that receives from encoding section (10) manage by flat type, the packets of information essential information is carried out information compressed bag compression unit (20); For effectively transmitting, make the multi-function device (30) that transmits after the big transmission packets of information of 188 bytes from the information of video, audio frequency and the data packets of packets of information compression unit (20) reception; From multi-function device (30) receive (modulation portion (40) of back transmission is compressed and modulate to packets of information again; The signal that receives from modulation portion (40) amplifies the RF amplifier (50) that the back sends; The transport part (60) that the signal that receives from RF amplifier (50) transmits; Receive the acceptance division (70) that transmits behind the digital broadcast signal that transmits transport part (60); The signal that receives from acceptance division (70) carries out the demodulation section (80) that sends after the demodulation; Signal from demodulation section (80) receives utilizes packet identifier video, audio frequency and data to be separated the demultplexer (90) of transmission; Video, audio frequency and data message from Port Multiplier (90) receives recover original state from compressive state, by the original picture of recovery and the packets of information recovery portion compositions such as (100) of Yang Sheng device energy audiovisual television broadcasting.The action specification of the present invention of Zu Chenging is as follows thus:

At first, TV and Radio Service is video, audio frequency and data based ISO/IEC 13818-2,3,6, specification encode by encoding section (10), be transformed to the essential information structure then.

Simultaneously, for the essential information data being pressed flat type compression and management, by packets of information compression unit (20) packet infrastructure, promptly the packets of information essential information is compressed again.In order effectively to transmit video, audio frequency and data packets essential information, form the big transmission information of 188 bytes, each and every one mixes by multi-function device (30).

By the transmission packets of information that Port Multiplier (30) mixes, the integrated information of continuity in time claims sub-information, by compressing again and export in VSB (sideband that Vtigial Sideband is residual) channel modulation portion (40) and RF enlarging section (50).

Simultaneously, the digital broadcasting information that is output (Bit Stream), the acceptance division of the Digital Television by each family is with as above said opposite, and promptly each is by demultplexer (90) and lsb decoder (100) decoding, thereby reaches audiovisual spectators energy audiovisual digital television broadcasting.To video, the audio-frequency information ID of each broadcasting channel and have to other broadcast messages (EPG: the table of the PSIP broadcast program recommended information), set program by demultplexer and received corresponding table.At this moment, demultplexer (90) is set the maximum number of table in the ordinary course of things about 29 simultaneously.Remaining respectively distribute one for audio frequency transmission packets of information and video information packets.In case, audio/visual information (being pid value) back by video cassette (VCT:VIDEOCASSETTE TAPE) translation channel program is set to demultplexer (90), can the audiovisual broadcast program, promptly be like this, yet in order to monitor reserved channel conversion number in each table of channel alteration and programme information, its number value is O～31, adds 1 after each circulation.

For example, if in channel 15-1, play baseball program, then send this information to VCT.Just at this moment, because of rainy interruption baseball program changes the situation of movie, it is 3 that beginning VCT has the channel conversion number, has the VCT of conversion movie channel information, and it has 4 channel conversion numbers.Simultaneously, in demultplexer (90), if, just do not know the content of conversion in VCT because of once receiving the information that VCT no longer receives VCT.

Have the table that except that the channel information converting, also has other information, i.e. STT, EITs, ETTs etc., all these tables can not once must monitor the channel conversion situation by demultplexer (90) in the back because of these table translations.But, can not be to all tables in order to monitor all information conversions, and in demultplexer, set up all monitor messages, in demultplexer, not only exceed the setting number of maximum table so, and system unblanks to increase many.

In order to address the above problem, in PSIP, manage the channel conversion number of all tables by MGT, therefore, to the table that once receives, there is no need to monitor channel conversion by demultplexer (90) again, because demultplexer (90) only monitors channel conversion to MGT as representative.

For the channel conversion of managing digital television, at first, in the MGT of radio receiver, be arranged on the information in the demultplexer, if in MGT mid band conversion transformation of variables, the content of then changing among the MGT just gets final product.The pid value and the channel conversion number that in the MGT content, comprise each table, therefore conversion has taken place can to compare which table, if find the table of conversion, then respective table is arranged on demultplexer (90) with new channel conversion situation, and then receives.

Simultaneously, in order to manage the channel conversion of DCCT and DCCSCT, the MGT content comprises DCCT and DCCSCT when definition.Therefore, the table of DCCT and DCCSCT monitored by MGT the conversion of its content in demultplexer (90), reduce the module overload, improve systematic function.

Fig. 2 is the enforcement figure that shows packets of information multi-function device action of the present invention.As diagram, in the packets of information multi-function device,, utilize video, audio frequency and other information to be contained in the transmission information and together be sent to DTV receiver by transfer system in order to transmit packets of information to the transport part.Multi-function device is not only play various broadcasting in the transfer rate scope of allowing, and for the conversational service is provided, data light signal also together transmits, and promptly various information transmit in co-channel.

Fig. 3 is the enforcement figure that shows packets of information demultplexer action of the present invention.As shown in the figure, the information that the packets of information demultplexer transmits from the channel of Digital Television is separated transmission video, audio frequency and other information by identifier (PID:Packet Identifier), and simultaneously, demultplexer has the function that distributes with category information.When shunting, shunt same category information with the identifier of including in the packets of information head portion.

In analog broadcast mode, transmit a kind of broadcasting in the frequency band; But in the digital broadcasting mode, transmit multiple broadcasting in the frequency band.

Claims (1)

1, a kind of digital TV channel conversion control apparatus is characterized in that: with video, audio frequency and data, form the encoding section of essential information structure according to the protocol rule back of encoding; The data of the essential information structure that receives from encoding section are in order to manage the packets of information compression unit of compressed information bag essential information by flat type; To audio frequency, video and the data of packets of information compression unit reception, in order effectively to transmit, the multi-function device that is optimized; The packets of information that from multi-function device, receives, the modulation portion that he is compressed again and modulates; The enlarging section that the signal that modulation portion is received amplifies; Transmit the transport part of enlarging section received signal; The acceptance division of the digital broadcast signal that sends from the reception transport part; The counter modulation portion that the signal that acceptance division is sent carries out counter modulation; From the signal that counter modulation portion receives, the demultplexer that utilizes packet identifier that video, audio frequency and data are separated; The video that receives from demultplexer, audio frequency and data message restore, and the compositions such as packets of information recovery portion by picture and Yang Sheng device audiovisual digital broadcasting.