CN100361513C

CN100361513C - Digital TV set and its multi channel A/V scramble confirmation method

Info

Publication number: CN100361513C
Application number: CNB2004100681004A
Authority: CN
Inventors: 金俸奭
Original assignee: Shanghai LG Electronics Co Ltd
Current assignee: Shanghai LG Electronics Co Ltd
Priority date: 2004-11-12
Filing date: 2004-11-12
Publication date: 2008-01-09
Anticipated expiration: 2024-11-12
Also published as: CN1774048A

Abstract

The present invention relates to a digital television, particularly to a digital television and a multipath channel audio/video scrambling confirmation method thereof, wherein the digital television confirms whether audio/video information is scrambled. The digital television comprises a tuner, a demodulator, a multipath resolver and a decoder, wherein the tuner tunes digital broadcast signals output by a transmitter to selected channels by receiver users; the demodulator outputs the tuned signals in a TP form; the multipath resolver resolves output TP signals, separates programs selected by the users from the programs unselected by the users and respectively filters, detects and scrambles the selected and the unselected programs; the decoder executes A/V decoding of the programs which are selected by the users and resolved in multipath.

Description

The scramble confirmation method of the audio/video of digital television and multi channel thereof

Technical field

The present invention is relevant digital television, particularly in relevant digital multi-channel channel broadcasting, simultaneously to the audio/video scramble confirmation method of audio/video digital television whether scrambling is confirmed and multi channel thereof.

Background technology

Current; main PPV (the pay TV that in wired and satellite digital broadcasting, plays a role; Pay Per View), the function of CP (copyright protection, Copy Protection) etc. is by conditional access system (Conditional Access System) audio frequency, video etc. to be carried out scrambling to handle and transmit.

User's receiver has the user of formal reception authority to whether scrambling is confirmed, then can watch by descrambling (unscramble) processing and listen to normal A/V (audio/video); The user who does not receive authority then can't untie scrambling, can not watch and listen to corresponding channel.

In the time can't normally showing above-mentioned channel through scrambling, then can simply not show corresponding channel or show the picture of scrambling by receiver.

In receiver, being used to understand corresponding channel can be had several by the method for scrambling by each channel categories, but most representative is the method for confirming according to transport_scrambling_control (transmission-scrambling-control) field (being made of 2 bits) in the packet header (header also claims header) of defined transport_packet (transmission package) in MPEG2 (ISO, IEC 13818-1) specification.

And, for to PES (elementary stream that packet header is arranged) substandard scrambling confirm, can utilize the PES_scrambling_control field of defined PES_packet (PES packets of information) in MPEG2 (ISO, the IEC 13818-1) specification.

For example, with regard to U.S.'s digital cable broadcast, if follow SCTE54 2003 specifications, then the meaning of transport_scrambling_control is identical with following table 1; With regard to the ground wave digital broadcasting of ATSC standard, also almost be to use in the same manner.

[table 1] transmission-scrambling-control field

Transmission-scrambling-control	Function
Transmission-scrambling-control	Function	00	The payload of the bag of scrambling not
01	Not scrambling, the private statement of using of ISP	00	The payload of the bag of scrambling not
01	Not scrambling, the private statement of using of ISP	10	Thin payload with the scrambling of even number key
11	Thin payload with the scrambling of odd number key	10	Thin payload with the scrambling of even number key

Shown in above-mentioned table 1, when having the value of binary digit 10,11, the audio frequency, video data of judging the corresponding PID with this transport packet are by scrambling.The substandard confirmation method of PES also much at one.

Fig. 1 is the block diagram of existing digital television, can understand the transmission of A/V signal.

With reference to Fig. 1, existing digital television receiver major part is to use an audio frequency, video to filter and decoding function, and according to this function all channels is carried out whether scrambling is judged.

At first, (audio frequency, the video of corresponding channels are selected in transmission package, transport_packet) signal packet data form output to the signal by tuner 1, demodulator 2 by demultiplexer 3 with digital TP.At this, selected audio frequency, video when being input to demultiplexer 3 or audio/video decoder 4, according to this transport_scrambling_control field value to whether scrambling is judged.

But resolved into the situation of a plurality of programs under by multichannel in this transport packet this moment, if only filter with A/V and the function of decoding to whether scrambling is judged, then can produce multiple restriction.

After the physical channel conversion that comprises a transport packet, want immediately whether scrambling is judged to all channels of inserting this transport packet, when in receiver, only using an A/V and decoding function as existing mode, for it is judged, not only the A/V of respective program is judged at the channel switch initial stage, and data based this function of the A/V of other program judged therefore in fact the A/V that wants of explicit user needs long time.That is, only after filtering according to one and decoding function judges the A/V TP packets of information of all programs, just begin to carry out the A/V decoding of user-selected corresponding channel and on screen, show, so consume long time.

Summary of the invention

Thereby the present invention considers above-mentioned prior art problems, aim to provide utilize multinomial A/V to filter or decoding function at short notice to the A/V scramble confirmation method of a plurality of programs digital television whether scrambling is confirmed and multi channel thereof.

Another object of the present invention aim to provide also can be simultaneously the promptly digital television of the A/V of the selected program of explicit user and the A/V scramble confirmation method of multi channel thereof.

According to a feature of the present invention, comprise following formation: will be tuned to the tuner of the user-selected channel of receiver from the digital broadcast signal of transmitter output; The demodulator that to export with the TP form through tuning signal; TP signal through output is decomposed, user-selected program is separated with unselected program and it is filtered, checks the demultiplexer of scrambling respectively; Select program to carry out the decoder of A/V decoding to the user who decomposes through multichannel.

Because being carried out multichannel, decomposes above-mentioned decoder, so can carry out the scrambling inspection.

Another feature of the present invention comprised with the next stage: user-selected channel is carried out the stage tuning, that decode and extract the A/V information of each program; Whether the A/V information to the program that extracted is the stage that user-selected program is confirmed; If user-selected program then carries out scramble confirmation and A/V decoding and shows, then only carry out the stage of scramble confirmation if not user-selected program.

The above-mentioned user-selected program and the scramble confirmation of the unselected program of user preferably carry out simultaneously.

The present invention has following effect: the A/V data of the multi channel that the digital television receiver can comprise in to transport packet are confirmed simultaneously to user-selected channel and its outer channel when scrambling is judged; Therefore, user-selected channel then is carried out the A/V decoding when carrying out scramble confirmation, the user just can watch in the shortest time and listen to A/V, and other channel then utilizes the demultiplexer that receiver possesses and the function of A/V decoder, carries out the scramble confirmation action in addition; Thereby, can eliminate the A/V processing delay of user-selected channel or the interference of interruption.

Description of drawings

Fig. 1 is the block diagram of existing digital television.

Fig. 2 is the block diagram according to the digital television of the present invention's design.

Fig. 3 is the A/V scramble confirmation method flow chart according to the digital television multi channel of the present invention's design.

Embodiment

Below, formation and the effect to a desirable embodiment of the present invention illustrated with reference to accompanying drawing.

Fig. 2 is the block diagram of showing according to the digital television of the present invention's design.

With reference to Fig. 2, constitute by following: will be tuned to the tuner 11 of the frequency of the user-selected channel of corresponding receiver by the digital broadcast signal of transmission such as earthwave, wired, satellite according to the digital television of the present invention design; Will be by the demodulator 12 of the tuning signals of tuner 11 with the output of MPEG2 TP form; Channel signals to the TP signal of output from demodulator 12 decomposes (parsing) and selection, and is separated into the demultiplexer 13 of the Voice ﹠ Video signal of each program; After the audio signal and decoding video signal to each program of output from demultiplexer 13 under relevant decoding algorithm, a plurality of decoders 14 that show.

To the action of the digital television of the present invention design be described below.

At first, utilize remote controller etc. to select under the situation of optional network specific digit channel the user of the receiver of digital television, receiver is then carried out the action of channel to this channel switch.Digital broadcast signal by transmission such as earthwave, wired, satellites by tuner 11 to the frequency of the selected channel of correspondence carry out tuning after, via demodulator 12, input to demultiplexer 13 with the form of MPEG2 transport packet.

In above-mentioned transport packet, comprise PSI or PSIP information, can obtain channel information by it.In above-mentioned channel information, comprise the information such as number, kind, A/V data of channel (program).

Subsequently, in above-mentioned demultiplexer 13, understand the pid value of the A/V data of user-selected program, will filter transport packet that should PID then by transport packet.

The A/V data that finish after filtration can be carried out in demultiplexer 13 that filters or the A/V decoder 14 that transmits after filtration whether scrambling is confirmed in reality.And, when these A/V data have normal reception authority the user, carry out the descrambling action by receiver or independent module (for example CAS module of POD, smart card etc.) and be transferred to decoder 14 afterwards, if the decoding normal termination, the user then can carry out audiovisual.

On the other hand, also have other program in transport packet except that user-selected program, whether scrambling is judged to this program then to utilize other function.Understand in can each program outside selected program after the pid value of corresponding A/V data,, perhaps A/V decoder 14 is set to a plurality ofly, utilize decoding function whether scrambling is judged at demultiplexer 13.

At this, above-mentioned scramble information can be between each channel of decision conversion, descrambling operation, provide in the function such as channel information OSD demonstration and use.

Fig. 3 is the multi channel scramble confirmation method flow chart of digital television among the present invention.

As shown in the figure, at first, the user utilizes selection channels (S11) such as remote controller.

So the digital television receiver carries out tuning, demodulation (S12) to the frequency of user-selected channel.

In the transport packet of demodulation, extract the A/V information (S13) of programme information decomposition and each program.

Whether be (S14) after user-selected program is judged to program, if user-selected program then carries out A/V and filters (S15) in demultiplexer through decomposing.

After filtering, scramble information is confirmed, stored; After carrying out the A/V decoding, carry out the A/V demonstration and can carry out audiovisual (S16-S18).

And when not being user-selected program (S14), whether demultiplexer is also carried out A/V and is filtered, store after confirming scramble information, then to existing the program that can confirm scramble information to judge (S19-S21) at the channel through decomposing.

If find to exist certifiable program, then program is carried out A/V and filter (S19) through judging; If there is not certifiable program, then finish scramble confirmation (S22).

By the above content that is illustrated, one of skill in the art can recognize, can carry out numerous variations and correction within the scope that does not break away from technological thought of the present invention.

Thereby, the content that technical scope of the present invention is not limited among the embodiment to be write down, and should determine according to the claim scope.

Claims

1, a kind of digital television, its feature comprises:

To be tuned to the tuner of the user-selected channel of receiver from the digital broadcast signal of transmitter output;

The demodulator that to export with the transmission package form through tuning signal;

Transmission package signal through output is decomposed, user-selected program is separated and respectively user-selected program and non-selected program filtered, checks the demultiplexer of scrambling with non-selected program;

Select program to carry out the module of descrambling to the above-mentioned user who decomposes through multichannel;

Select program to carry out a plurality of decoders of audio/video decoding to above-mentioned user through descrambling.

2, a kind of multi channel scramble confirmation method of digital television, its feature comprised with the next stage:

The stage that user-selected channel is carried out tuning, demodulation and extracts the audio/visual information of each program;

Whether to the above-mentioned audio/visual information that extracts program is the stage that user-selected program is confirmed;

If user-selected program then carries out the decoding of scramble confirmation and audio/video and shows, then only carry out the stage of scramble confirmation if not user-selected program.

3, as the multi channel scramble confirmation method of digital television as described in the claim 2, it is characterized by, user-selected program and non-selected program are carried out scramble confirmation simultaneously.