CN107396153A - Passageway switching method and device - Google Patents
Passageway switching method and device Download PDFInfo
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- CN107396153A CN107396153A CN201710655413.7A CN201710655413A CN107396153A CN 107396153 A CN107396153 A CN 107396153A CN 201710655413 A CN201710655413 A CN 201710655413A CN 107396153 A CN107396153 A CN 107396153A
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- 238000000034 method Methods 0.000 title claims abstract description 52
- 230000005540 biological transmission Effects 0.000 claims description 20
- 238000012545 processing Methods 0.000 claims description 7
- 230000008859 change Effects 0.000 description 10
- 238000001914 filtration Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000013468 resource allocation Methods 0.000 description 2
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/418—External card to be used in combination with the client device, e.g. for conditional access
- H04N21/4181—External card to be used in combination with the client device, e.g. for conditional access for conditional access
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
- H04N21/4383—Accessing a communication channel
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
- H04N21/4385—Multiplex stream processing, e.g. multiplex stream decrypting
- H04N21/43853—Multiplex stream processing, e.g. multiplex stream decrypting involving multiplex stream decryption
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- Multimedia (AREA)
- Signal Processing (AREA)
- Theoretical Computer Science (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The application provides a kind of passageway switching method and device, and applied to DTV, the DTV is connected with the CAM cards for descrambling TV programme, and methods described includes：When the DTV plays scrambled program under DTV passages, if detecting, the DTV switches to other passages from the DTV passages, then sent to the CAM cards and stop descrambling instruction, the termination descrambling instruction is used to indicate that the CAM cards empty the descrambling information of the scrambled program.It using this method, can avoid occurring flower screen or splashette phenomenon when switching to DTV passages from other passages to DTV, and a longer audio frequency and video must not be not provided with and be in mute state durations, the problem of so as to cause Consumer's Experience poor.
Description
Technical field
The application is related to digital TV technology, more particularly to a kind of passageway switching method and device.
Background technology
CAM (Condition Access Module, condition receiving card) cards are the numeral electricity of being used for smart card slot
Depending on personality card, also known as Conditional Access Module or regarding close card, for connecting DTV, to handle the number of outside source transmission
According to code stream.The basic function of CAM cards is filtering descrambling, i.e., the data code flow scrambled that outside source is sent is changed into TV
Content, and shown on DTV, user is directly watched ordered pay-TV without set top box
Content.
Platform function is cut what current DTV was commonly used, when cutting platform every time, DTV is required for the transmission of CAM cards
CA_PMT tables, to inform that CAM cards need to descramble the data of which channel.After CAM cards receive CA_PMT tables, it can empty
The descrambling information of program in the past, including Control Word etc., to start to descramble to new program again.With TV programme signal source
Variation, passage switching are also gradually more and more common.
In some scenes, user switches DTV from DTV (Digital Television, DTV) passage
To other passages, such as HDMI (High Definition Multimedia Interface, HDMI)
During passage, DTV has simply given the resource allocations such as player to other passages, but CAM cards still remain with before solution
Information is disturbed, is ready to carry out filtering descrambling to the data code flow received.So, subsequent user again by DTV from other
Passage switches to DTV passages, and (other passages are switched to from DTV passages if being switched to before passage switching is put in the follow-up continued broadcasting of DTV passages
Before) channel when, because channel does not change, CAM cards can be based on the descrambling information retained before switching data to receiving immediately
Code stream carries out filtering descrambling, and DTV commences play out television content.But in related protocol, in order to avoid in some fields
Do not send the problem of CA_PMT tables can cause CAM cards not descramble in scape, DTV channel starts or when occupying focus again, number
Word TV all can send a CA_PMT tables corresponding with current transmission code stream to CAM cards again, i.e. DTV is logical from other
When road switches to DTV passages, CAM cards can also receive a CA_PMT tables, after CAM clampings receive a CA_PMT tables, i.e.,
The channel for making the channel corresponding to the CA_PMT tables be played before still being switched by passage, but CAM cards will be considered that there occurs cut platform
Operation, so as to empty current descrambling information, and parses to a CA_PMT tables, new descrambling information is obtained, with root
Filtering descrambling is carried out to subsequently received data code flow according to the new descrambling information, also, in whole process, CAM cards are
Data code flow is firstly received, then receives a CA_PMT tables, it can be seen that, DTV is being cut from DTV passages
To other passages, DTV passages then are switched back into by other passages again, after switching back into DTV passages, in addition to indivedual scenes,
It still may proceed to play the channel before switching in major applications scene, therefore, DTV will be played inevitably
Break suddenly after flashy television content, continue to replay the phenomenon of television content again afterwards, i.e. DTV will go out
Now flower screen or splashette phenomenon.
It is above-mentioned in order to solve the problems, such as, can be in DTV after other passages switch back into DTV passages in correlation technique
One section of duration in, the control of the audio frequency and video of DTV is to be cut in mute states, i.e. sound mute, the state of image blank screen
Gain after the CA_PMT list processings that are issued after DTV passages perform and terminate, then cancel the mute states of audio frequency and video, to avoid above-mentioned institute
The flower screen or splashette phenomenon of description.
However, the means for controlling audio frequency and video mute states to be also only evasion, do not solve Hua Pinghuo thoroughly
Splashette problem, the duration of mute states how is reasonably set to be restricted in actual applications by many factors it is difficult to determine, if
Should " one section of duration " it is shorter, then can not avoid above-mentioned described flower screen or splashette phenomenon, if should " one section of duration " it is longer, that is, count
The audio frequency and video long period of word TV is in mute states, will influence Consumer's Experience, therefore, in practice, it is contemplated that CAM cards
Model it is different, the multi-party factor such as system platform difference of DTV, when being generally all provided with a longer mute state
It is long so that Consumer's Experience is excessively poor.
The content of the invention
In view of this, the application provides a kind of passageway switching method and device, to avoid logical from other to DTV
There is flower screen or splashette phenomenon in road when switching to DTV passages, and must not be not provided with a longer audio frequency and video mute state duration,
The problem of causing Consumer's Experience poor.
Specifically, the application is achieved by the following technical solution：
According to the first aspect of the embodiment of the present application, there is provided a kind of passageway switching method, applied to DTV, the number
Word TV is connected with the CAM cards for descrambling TV programme, and methods described includes：
When the DTV plays the first scrambled program under DTV passages, if detecting the DTV from institute
State DTV passages and switch to other passages, then sent to the CAM cards and stop descrambling instruction, the termination descrambling instruction is used to refer to
Show that the CAM cards empty the descrambling information of first scrambled program.
According to the second aspect of the embodiment of the present application, there is provided a kind of passageway switching method, applied to for descrambling TV Festival
Purpose CAM cards, the CAM cards are connected with DTV, and methods described includes：
Termination descrambling instruction is received, the termination descrambling instruction is that the DTV plays first under DTV passages
During scrambled program, detect what is sent when the DTV switches to other passages from the DTV passages；
Based on the descrambling information for stopping descrambling instruction and emptying first scrambled program.
According to the third aspect of the embodiment of the present application, there is provided a kind of channel switching device, applied to DTV, the number
Word TV is connected with the CAM cards for descrambling TV programme, and described device includes：
First sending module, for when the DTV plays the first scrambled program under DTV passages, if detecting
The DTV switches to other passages from the DTV passages, then is sent to the CAM cards and stop descrambling instruction, in described
Only descrambling instruction is used to indicate that the CAM cards empty the descrambling information of first scrambled program.
According to the fourth aspect of the embodiment of the present application, there is provided a kind of channel switching device, applied to descrambling TV programme
CAM cards, the CAM cards are connected with DTV, and described device includes：
First receiving module, stop descrambling instruction for receiving, the termination descrambling instruction is that the DTV exists
When playing the first scrambled program under DTV passages, detect and sent out when the DTV switches to other passages from the DTV passages
Send；
Processing module, for based on the descrambling information for stopping descrambling instruction and emptying first scrambled program.
As seen from the above-described embodiment, by when DTV plays scrambled program under DTV passages, if detecting numeral
TV switches to other passages from DTV passages, then is sent to CAM cards and stop descrambling instruction, to cause CAM cards according to the termination solution
Disturb the descrambling information that instruction empties scrambled program, it is possible to achieve follow-up when DTV switches back into DTV passages from other passages
When, because CAM cards do not preserve any descrambling information, descrambled so as to which the data code flow received will not be docked, until CAM cards weight
After CA_PMT tables corresponding to the new current transmission code stream for receiving DTV transmission, just received again according to this again
CA_PMT tables descramble to the data code flow received, and DTV is being switched to from other passages to DTV so as to avoid
Occur flower screen or splashette phenomenon during passage, and a longer audio frequency and video mute state duration must not be not provided with, cause user's body
Test the problem of poor.
Brief description of the drawings
Fig. 1 is the illustrative examples of condition receiving system 100；
Fig. 2 is one embodiment flow chart of the application passageway switching method；
Fig. 3 is another embodiment flow chart of the application passageway switching method；
Fig. 4 is another embodiment flow chart of the application passageway switching method；
Fig. 5 is one embodiment block diagram of the application channel switching device；
Fig. 6 is another embodiment block diagram of the application channel switching device.
Embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.Following description is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the application.On the contrary, they be only with it is such as appended
The example of the consistent apparatus and method of some aspects be described in detail in claims, the application.
It is only merely for the purpose of description specific embodiment in term used in this application, and is not intended to be limiting the application.
" one kind " of singulative used in the application and appended claims, " described " and "the" are also intended to including majority
Form, unless context clearly shows that other implications.It is also understood that term "and/or" used herein refers to and wrapped
Containing the associated list items purpose of one or more, any or all may be combined.
It will be appreciated that though various information, but this may be described using term first, second, third, etc. in the application
A little information should not necessarily be limited by these terms.These terms are only used for same type of information being distinguished from each other out.For example, do not departing from
In the case of the application scope, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as
One information.Depending on linguistic context, word as used in this " if " can be construed to " ... when " or " when ...
When " or " in response to determining ".
With the development of DTV, selection of the user plane to increasing digital television program, meanwhile, broadcast dealer
Due to the increase of cost of investment, then certain license fee is collected to user and is used.Condition receiving system (Conditional Access
System, abbreviation cas system) it is exactly that its major function is true in order to meet that some broadcast services implement the system of Access Control
The user that guarantor paid or will paid expense can just watch selected TV programme.
As shown in figure 1, be the illustrative examples of condition receiving system 100, the condition receiving system 100 exemplified by Fig. 1
Include outside source 101, DTV 102, and for descrambling the CAM cards 103 of TV programme.Wherein, external signal
Source 101 can be scrambled with using scramble sequence to original data code flow, and data are upset, afterwards, by the data after scrambling
Code stream is sent to DTV 102；DTV 102 receives data code flow, if detect to receive is scrambling code stream,
CAM cards 103 can be driven to work, and the pmt table for describing programme information is obtained in code stream is scrambled, the pmt table is parsed and obtain
To CA_PMT tables, the CA_PMT tables are sent to CAM cards 103, CAM cards 103 then call decryption program according to the CA_PMT tables, right
Scrambled data carries out filtering descrambling, recovers original data code flow, so as to which DTV 102 can be according to original numeric data code
Flow display TV content.
For CA_PMT tables, it mostlys come from PMT (Program Map Table) table in code stream, and pmt table is passed in code stream
A defeated form for being used to describe programme information.Each corresponding pmt table of channel, as cctv1 and cctv2 pmt table are
Different.For pmt table, the details of a channel are described in the form, but when we play a channel, are first had to
The pmt table of the channel is got from code stream, is therefrom parsed in the pcrpid of this channel, audio frequency and video pid, cipher mode etc.
Hold, and the audio, video data bag of the program is filtered out according to audio frequency and video pid, for being played after decrypting decoding.
When playing the content of channel, need to accuse if ciphered program is, it is necessary to notify CAM cards descrambling, during notice
Tell the program number of CAM fixture body channels, audio frequency and video pid and cipher mode etc..These information have in pmt table, but PMT
Some information CAM cards are unconcerned in table, so in general, television system is sent to the CA_PMT tables of CAM cards, is pair
Pmt table carries out the content format that repacking is reconstructed into CAM cards needs, specifically how to build CA_PMT tables, is the conventional skill of this area
Art means, in this not go into detail.
Entering in DTV 102 under the application scenarios of row of channels switching, it is assumed that DTV 102 is currently at DTV passages,
And scrambled program is played, if DTV 102 has been switched to HDMI passages, DTV 102 by user from DTV passages
Be by resource allocations such as players to HDMI passages, and fail to give notice CAM cards 103 it is paused play the scrambled program, then,
CAM cards 103 still maintain the descrambling information of the scrambled program, " descrambling information " mentioned here can include descrambling mode,
Descramble key, etc..
Subsequently, if DTV 102 is switched back into DTV passages by user from HDMI passages again, and still play from DTV passages
When switching to before HDMI passages the channel played, if the scrambling side of data code flow on the channel is not changed by front end operator
Formula, then CAM cards 103 will be descrambled to the data code flow received immediately based on above-mentioned retained descrambling information, so as to
DTV 102 commences play out television content.But in related protocol, in order to avoid not sending CA_ in some scenes
The problem of pmt table can cause CAM cards not descramble, DTV channel starts or when occupying focus again, DTV all can be again
Send a CA_PMT tables corresponding with current transmission code stream to CAM cards, i.e., user by DTV 102 from HDMI passages again
When switching back into DTV passages, DTV 102 will send a CA_PMT tables to CAM cards 103 again.CAM cards 103 receive this
After the CA_PMT tables resend, although the channel corresponding to the CA_PMT tables that resend does not change, CAM
Card still thought there occurs cutting platform operation, so as to which, CAM cards will empty current descrambling information, and the CA_ resend according to this
Pmt table obtains corresponding descrambling information, to descramble to subsequently received data code flow.
In fact, after CAM clampings receive CA_PMT tables, the data of needs are filled into, CW is got by certain mechanism
Control word, this CW control word can also descramble audio, video data for scrambling audio, video data with it.CW
Control word is different in different channels, and the CW control words of same channel also can ceaselessly change, and is added for different
For close system, the period of change of CW control words is different, or recycle, this depends primarily on operator
Encryption system, but the scramble information on common scrambling field at present, same channel is typically all without there is big change.
So coming when we cut away switchback again from a channel, data code flow can also may be carried out using identical CW control words
Descrambling, but in order to avoid in some scenes, before and after channel switch, the CW control words for being actually available to descrambling change,
Generally when channel is cut away and switchback comes, new CW control words are obtained according to the data code flow being currently received again.
During the entire process of foregoing description, CAM cards are to be firstly received data code flow, then receive what is resend
CA_PMT tables, so as to by DTV 102, from during HDMI passages switch back into DTV passages, DTV 102 will
Appearance is broken suddenly after having played flashy television content, afterwards, continues to replay the phenomenon of television content again, i.e., digital
There is flower screen or splashette phenomenon in TV 102, so as to influence Consumer's Experience.
It should be noted that above-mentioned described DTV 102 switches over only between DTV passages and HDMI passages
Only as an example, in actual applications, DTV 102 enters as procedure described above between DTV passages and other non-DTV passages
During row switching, such as ATV passages, AV passages, component channel etc., flower screen or splashette phenomenon can all occur.
, can be in DTV after other passages switch back into DTV passages in correlation technique in order to solve the above problems
It is in one section of duration, the audio frequency and video control of DTV is to be switched in mute states, i.e. sound mute, the state of image blank screen
Return after the CA_PMT list processings that issue after DTV passages perform and terminate, then cancel the mute states of audio frequency and video, still, in related skill
In art, it is contemplated that the models of CAM cards is different, the multi-party factor such as system platform difference of DTV, generally all set one compared with
Long mute state durations, so as to which Consumer's Experience will be caused excessively poor.
Based on this, the application proposes a kind of passageway switching method and device, using this method, can avoid to digital electricity
Occur flower screen or splashette phenomenon during depending on switching back into DTV passages from other passages, and must not be not provided with a longer audio frequency and video
In mute state durations, the problem of causing Consumer's Experience poor.
It is as follows, the condition receiving system 100 with reference to exemplified by Fig. 1, distinguish from the angle of DTV 102 and CAM cards 103
The passageway switching method proposed to the application illustrates：
First, it is described from the angle of DTV 102：
Fig. 2 is referred to, is one embodiment flow chart of the application passageway switching method, this method can apply to Fig. 1
On exemplified DTV 102, as shown in figure 1, DTV 102 is connected with the CAM cards 103 for descrambling TV programme,
This method may comprise steps of：
Step 201：When DTV plays scrambled program under DTV passages, if detecting DTV from DTV passages
Other passages are switched to, then is sent to CAM cards and stops descrambling instruction, termination descrambling instruction is used to indicate that CAM cards empty scrambling
The descrambling information of program.
In the embodiment of the present application, unlike the prior art, when DTV 102 plays scrambling under DTV passages
During program, if detecting, DTV 102 switches to other passages, such as HDMI passages from DTV passages, then DTV 102
One can be sent to CAM cards 103 and stops descrambling instruction, termination descrambling instruction is used to indicate that CAM cards 103 empty current solution
Disturb the descrambling information of information, the i.e. scrambled program.
After CAM cards 103 receive termination descrambling instruction, current descrambling information can be emptied.Handled by this kind,
When DTV 102 subsequently being switched back into DTV passages from other passages again, because CAM cards 103 currently do not preserve any descrambling
Information, descrambled so as to which the data code flow received will not be docked.
In a preferable implementation, the instruction of termination descrambling can be not carry the CA_PMT tables of CA description.
It will be appreciated by persons skilled in the art that CA description include the information such as CA_system_ID, CA_PID, and pass through CA_
The information such as system_ID and CA_PID, can just obtain business cipher key, further ECM code streams be decrypted to obtain with business cipher key
Control Word, in the corresponding registers for the decoding chip that Control Word is inserted to CAM cards, CAM cards can be just realized to numeric data code
Stream is descrambled, and recovers initial data code stream.
As can be seen here, after CAM cards 103 receive the CA_PMT tables for not carrying CA description, it is believed that will subsequently receive
To clear stream, i.e., the data code flow not scrambled, so as to which current descrambling information be emptied, pause descrambling work.
In the preferable implementation, because common CAM cards can identify CA_PMT tables, so as to by right
CA_PMT tables are improved, and can not only realize the function of stopping descrambling instruction, while do not need the manufacturer pair of CAM cards
CAM cards make change, stop descrambling instruction with identification, it can be seen that, by the way that CA description will not be carried in the embodiment of the present application
CA_PMT tables as stop descrambling instruction have preferably compatibility.
It should be noted that described by above-mentioned, the CA_PMT tables that will do not carry CA description instruct as descrambling is stopped
Only a kind of preferable implementation, in actual applications, can also have other modes, for example, can be by the CA_ of mistake
Pmt table can be the CA_ for carrying illegal CA_PID values as descrambling instruction, " the CA_PMT tables of mistake " mentioned here is stopped
Pmt table etc., during CAM to be stuck in receive the wrong CA_PMT tables, that is, think currently to cut platform operation, so as to general
Current descrambling information empties, but CA_PMT tables that can not be wrong according to this parse correct available descrambling information.
, can be from current transmission code stream, i.e., in addition, subsequently when DTV 102 switches back into DTV passages from other passages
Parsing obtains corresponding CA_PMT tables in the data code flow of current crypto program, and the corresponding CA_PMT tables are sent to CAM
Card 103, to allow CAM cards 103 to be descrambled according to the corresponding CA_PMT tables to current crypto program.
It should be noted that in actual applications, by DTV after other passages switch back into DTV passages, play
Still for passage switching before channel when, the scrambled program played can be identical or different, the application couple
This is not restricted.No matter before and after passage switching, whether the scrambled program played is identical, it is clear that, by performing sheet
The method that is there is provided of application embodiment, due to by DTV from DTV passages switch to other passages when, CAM cards stop solving
Work is disturbed, subsequently, by DTV after other passages switch back into DTV passages again, even if CAM cards first receive data code flow,
Also due to lack correct descrambling information, without descrambling to the data code flow received, so as to which DTV will not be shown
Television content, until after DTV sends correct CA_PMT tables to CAM cards again, CAM cards are just according to the CA_PMT tables
The data code flow received is descrambled, DTV starts display TV content.As can be seen here, using the embodiment of the present application
The method provided, be not in break suddenly after DTV plays flashy television content, continue to play electricity afterwards again
Depending on the situation of content, i.e. DTV is not in flower screen or splashette phenomenon.Simultaneously as DTV is sent out to CAM cards again
Correct CA_PMT tables are sent, the process used time that CAM cards obtain new descrambling information according to the CA_PMT tables is very of short duration, so as to by number
Word TV the DTV only not display TV content within the very of short duration time, is compared after other passages switch back into DTV passages
In correlation technique, in order to avoid occurring flower screen or splashette phenomenon when switching to DTV passages from other passages to DTV,
And a longer audio frequency and video must not be not provided with and be in for mute state durations, the method that the embodiment of the present application is provided can be with
The problem of being effectively prevented from causing Consumer's Experience poor.
When DTV is switched to other passages from DTV passages, but from other passages switch back when, if channel has change
Change, for example, reaching reproduction time on some channel preengage under DTV passages, after user switches back, it is pre- that this can be jumped directly to
It about channel, therefore, can change before and after channel switch, now, because channel has been changed, be preserved on a channel before switching
Descrambling data, the bit stream data on the new channel after switching can not be descrambled, therefore, can only wait and get switching
CA_PMT tables corresponding to the bit stream data of new channel afterwards, can just descrambling broadcasting, i.e. background skill be carried out to the data of new channel
Flower screen or splashette problem described in art are not in that in practice, this scene is fewer, when more, by numeral
TV from other passages switch back into DTV passages when, can all come back to switching before where channel on, so, be substantially all meeting
There is the problem of described in background technology.
It is how to parse to obtain corresponding CA_PMT tables, this area from current transmission code stream as DTV 102
Technical staff may refer to description of the prior art, and the application is not described further to this.
As seen from the above-described embodiment, by when DTV plays scrambled program under DTV passages, if detecting numeral
TV switches to other passages from DTV passages, then is sent to CAM cards and stop descrambling instruction, to cause CAM cards according to the termination solution
Disturb the descrambling information that instruction empties scrambled program, it is possible to achieve follow-up when DTV switches back into DTV passages from other passages
When, because CAM cards do not preserve any descrambling information, descrambled so as to which the data code flow received will not be docked, until CAM cards
Again after receiving CA_PMT tables corresponding to the current transmission code stream of DTV transmission, just received again according to this again
CA_PMT tables descramble to the data code flow received, and DTV is being switched to from other passages to DTV so as to avoid
Occur flower screen or splashette phenomenon during passage, and a longer audio frequency and video mute state duration must not be not provided with, cause user's body
Test the problem of poor.
Secondly, it is described from the angle of CAM cards 103：
Fig. 3 is referred to, is another embodiment flow chart of the application passageway switching method, this method can apply to figure
On CAM cards 103 exemplified by 1, as shown in figure 1, the CAM cards 103 connect DTV 102, this method can include following step
Suddenly：
Step 301：Receive termination descrambling instruction, the termination descrambling instruction be DTV is played under DTV passages add
When disturbing program, detect what is sent when DTV switches to other passages from DTV passages.
Step 302：The descrambling information for emptying scrambled program is instructed based on stopping to descramble.
The detailed description of step 301 and step 302 may refer to the associated description of above-mentioned embodiment illustrated in fig. 2, herein not
It is described in detail again.
As seen from the above-described embodiment, by when DTV plays scrambled program under DTV passages, if detecting numeral
TV switches to other passages from DTV passages, then is sent to CAM cards and stop descrambling instruction, to cause CAM cards according to the termination solution
Disturb the descrambling information that instruction empties scrambled program, it is possible to achieve follow-up when DTV switches back into DTV passages from other passages
When, because CAM cards do not preserve any descrambling information, descrambled so as to which the data code flow received will not be docked, until CAM cards
Again after receiving CA_PMT tables corresponding to the current transmission code stream of DTV transmission, just received again according to this again
CA_PMT tables descramble to the data code flow received, and DTV is being switched to from other passages to DTV so as to avoid
Occur flower screen or splashette phenomenon during passage, and a longer audio frequency and video must not be not provided with and be in mute state durations, cause to use
The problem of family experience is poor.
Fig. 4 is referred to, is another embodiment flow chart of the application passageway switching method, method is upper shown in the Fig. 4
On the basis of stating method shown in Fig. 3, describe emphatically subsequently by DTV after other passages switch back into DTV passages, CAM cards
103 processing procedure, may comprise steps of：
Step 401：Receive when DTV switches back into DTV passages from other passages, parsed from current transmission code stream
Obtain corresponding CA_PMT tables.
The detailed description of step 401 may refer to the associated description of above-mentioned embodiment illustrated in fig. 2, will not be described in detail herein.
Step 402：The corresponding CA_PMT tables are parsed, obtain descrambling information.
Step 403：According to descrambling information, current crypto program is descrambled.
CAM cards 103 are how to parse CA_PMT tables, obtain the descrambling letter of the currently playing scrambled program of DTV 102
Breath, and the scrambled program currently playing to DTV 102 according to the parsing information is descrambled, those skilled in the art can
Not to be described further to this referring to description of the prior art, the application.
As seen from the above-described embodiment, by when DTV plays scrambled program under DTV passages, if detecting numeral
TV switches to other passages from DTV passages, then is sent to CAM cards and stop descrambling instruction, to cause CAM cards according to the termination solution
Disturb the descrambling information that instruction empties scrambled program, it is possible to achieve follow-up when DTV switches back into DTV passages from other passages
When, because CAM cards do not preserve any descrambling information, descrambled so as to which the data code flow received will not be docked, until CAM cards
Again after receiving CA_PMT tables corresponding to the current transmission code stream of DTV transmission, just received again according to this again
CA_PMT tables descramble to the data code flow received, and DTV is being switched to from other passages to DTV so as to avoid
Occur flower screen or splashette phenomenon during passage, and a longer audio frequency and video mute state duration must not be not provided with, cause user's body
Test the problem of poor.
Corresponding with the embodiment of aforementioned channels switching method, present invention also provides the embodiment of channel switching device.
Fig. 5 is refer to, is one embodiment block diagram of the application channel switching device, the device can apply to Fig. 1 institutes
On the DTV 102 of example, as shown in fig. 1, the DTV 102 is connected with the CAM cards for descrambling TV programme, should
Device can include：First sending module 51.
First sending module 51, it can be used for when the DTV plays scrambled program under DTV passages, if inspection
Measure the DTV and switch to other passages from the DTV passages, then sent to the CAM cards and stop descrambling instruction, institute
Termination descrambling instruction is stated to be used to indicate that the CAM cards empty the descrambling information of the scrambled program.
In one embodiment, the termination descrambling instruction includes：
The CA_PMT tables of conditional access CA description are not carried.
In one embodiment, described device can also include (not shown in Fig. 5)：Second sending module 42.
Second sending module 52, it can be used for when the DTV switches back into the DTV passages from other passages,
Triggering parsing from current transmission code stream obtains corresponding CA_PMT tables, and corresponding CA_PMT tables are sent to described
CAM cards, to cause the CAM cards to be descrambled according to the new CA_PMT tables to current crypto program.
Fig. 6 is refer to, is another embodiment block diagram of the application channel switching device, the device can apply to Fig. 1
On exemplified CAM cards 103, as shown in figure 1, the CAM cards are connected with DTV 102, the device can include：First receives
Module 61, processing module 62.
Wherein, first receiving module 61, can be used for receiving termination descrambling instruction, the termination descrambling instruction is institute
When stating DTV scrambled program is played under DTV passages, detect that the DTV switches to other from the DTV passages
Sent during passage；
The processing module 62, it can be used for based on the descrambling information for stopping descrambling instruction and emptying the scrambled program.
In one embodiment, the termination descrambling instruction includes：
The CA_PMT tables of conditional access CA description are not carried.
In one embodiment, described device can also include (not shown in Fig. 6)：Second receiving module, parsing module, solution
Disturb module.
Wherein, second receiving module, can be used for receiving when the DTV switches back into the DTV from other passages
During passage, parsed from current transmission code stream and obtain corresponding CA_PMT tables；
The parsing module, it can be used for parsing corresponding CA_PMT tables, obtain descrambling information；
The descrambling module, it can be used for, according to the descrambling information, descrambling current crypto program.
The function of unit and the implementation process of effect specifically refer to and step are corresponded in the above method in said apparatus
Implementation process, it will not be repeated here.
For device embodiment, because it corresponds essentially to embodiment of the method, so related part is real referring to method
Apply the part explanation of example.Device embodiment described above is only schematical, wherein described be used as separating component
The unit of explanation can be or may not be physically separate, can be as the part that unit is shown or can also
It is not physical location, you can with positioned at a place, or can also be distributed on multiple NEs.Can be according to reality
Need to select some or all of module therein to realize the purpose of application scheme.Those of ordinary skill in the art are not paying
In the case of going out creative work, you can to understand and implement.
The preferred embodiment of the application is the foregoing is only, not limiting the application, all essences in the application
God any modification, equivalent substitution and improvements done etc., should be included within the scope of the application protection with principle.
Claims (10)
1. a kind of passageway switching method, applied to DTV, the DTV is connected with the CAM for descrambling TV programme
Card, it is characterised in that methods described includes：
When the DTV plays scrambled program under DTV passages, if detecting the DTV from the DTV passages
Other passages are switched to, then is sent to the CAM cards and stops descrambling instruction, the termination descrambling instruction is used to indicate the CAM
Card empties the descrambling information of the scrambled program.
2. according to the method for claim 1, it is characterised in that the termination descrambling instruction includes：
The CA_PMT tables of conditional access CA description are not carried.
3. according to the method for claim 1, it is characterised in that after the transmission termination descrambling instruction to the CAM cards
Also include：
When the DTV switches back into the DTV passages from other passages, trigger to parse obtaining from current transmission code stream
Corresponding CA_PMT tables, and corresponding CA_PMT tables are sent to the CAM cards, to cause the CAM cards according to
Corresponding CA_PMT tables descramble to current crypto program.
4. a kind of passageway switching method, applied to the CAM cards of descrambling TV programme, the CAM cards are connected with DTV, and it is special
Sign is that methods described includes：
Termination descrambling instruction is received, the termination descrambling instruction is that the DTV plays scrambled program under DTV passages
When, detect what is sent when the DTV switches to other passages from the DTV passages；
Based on the descrambling information for stopping descrambling instruction and emptying the scrambled program.
5. according to the method for claim 4, it is characterised in that the termination descrambling instruction includes：
The CA_PMT tables of conditional access CA description are not carried.
6. according to the method for claim 4, it is characterised in that the scrambled program is emptied based on the termination descrambling instruction
Descrambling information after also include：
When the DTV switches back into the DTV passages from other passages, obtained phase is parsed from current transmission code stream
The CA_PMT tables answered；
Corresponding CA_PMT tables are parsed, obtain descrambling information；
According to the descrambling information, current crypto program is descrambled.
7. a kind of channel switching device, applied to DTV, the DTV is connected with the CAM for descrambling TV programme
Card, it is characterised in that described device includes：
First sending module, for when the DTV plays scrambled program under DTV passages, if detecting the numeral
TV switches to other passages from the DTV passages, then is sent to the CAM cards and stop descrambling instruction, and the termination descrambling refers to
Make for indicating that the CAM cards empty the descrambling information of the scrambled program.
8. device according to claim 7, it is characterised in that described device also includes：
Second sending module, for when the DTV switches back into the DTV passages from other passages, triggering from working as forward pass
Parsing obtains corresponding CA_PMT tables in defeated code stream, and corresponding CA_PMT tables are sent to the CAM cards, to cause
CAM cards are stated to descramble current crypto program according to corresponding CA_PMT tables.
9. a kind of channel switching device, applied to the CAM cards of descrambling TV programme, the CAM cards are connected with DTV, and it is special
Sign is that described device includes：
First receiving module, stop descrambling instruction for receiving, the termination descrambling instruction is that the DTV leads in DTV
When scrambled program is played under road, detect what is sent when the DTV switches to other passages from the DTV passages；
Processing module, for based on the descrambling information for stopping descrambling instruction and emptying the scrambled program.
10. device according to claim 9, it is characterised in that described device also includes：
Second receiving module, for receiving when the DTV switches back into the DTV passages from other passages, from working as forward pass
Parsing obtains corresponding CA_PMT tables in defeated code stream；
Parsing module, for parsing corresponding CA_PMT tables, obtain descrambling information；
Descrambling module, for according to the descrambling information, descrambling to the current crypto program.
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| CN201710655413.7A CN107396153B (en) | 2017-08-03 | 2017-08-03 | Channel switching method and device |
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| CN201710655413.7A CN107396153B (en) | 2017-08-03 | 2017-08-03 | Channel switching method and device |
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| CN107396153B CN107396153B (en) | 2020-05-12 |
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| CN109660847A (en) * | 2018-12-24 | 2019-04-19 | 青岛海信电器股份有限公司 | Control method and device, set-top box to digital video reception card descrambling |
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| CN107396153B (en) | 2020-05-12 |
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