CN101426110A - Method for implementing television channel switch and multimedia broadcast receiving terminal - Google Patents
Method for implementing television channel switch and multimedia broadcast receiving terminal Download PDFInfo
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Abstract
The invention discloses a method for realizing television channel switch, including: determining a channel where the current broadcast channel data source locates and a channel where the preset appointed channel data source locates, wherein, the appointed channel has one or a plurality of channels; performing receiving, channel decoding and caching to the data of the channel where the current broadcast channel data source locates and the data of the channel where the preset appointed channel data source locates, and performing data demultiplexing, audio and video decoding and broadcasting to the data cached in the channel where the current broadcast channel data source locates; when the broadcast channel is switched to any one appointed channel, directly processing and broadcasting the data cached in the channel where the appointed channel data source locates. The present invention also discloses a multimedia broadcast receiving terminal. Application of the present invention can greatly reduce the switching delay.
Description
Technical field
The present invention relates to the multi-medium broadcasting receiving terminal technology, particularly a kind of method and multi-medium broadcasting receiving terminal of realizing that television channel switches.
Background technology
The receiving terminal of mobile multimedia broadcast system is logically by radio-frequency front-end, channel-decoding, and demultiplexing, audio/video decoding, audio frequency and video output several sections is formed.Utilize this receiving terminal, the program that can receive arbitrary channel is play.The reception and the playing flow of concrete channel comprise:
Step 11, definite channel n that wants the data source place of broadcasting channel;
Step 12, the data of the channel n that per second is received are carried out channel-decoding, and the decoded data of buffer memory;
Step 13 is to the data cached data demultiplexing that carries out;
Audio/video decoding and broadcast are carried out to the data behind the demultiplexing in step 14～15.
If the user thinks switching channels, common way is to stop current channel-decoding, changes channel, restarts playing flow, promptly re-executes above-mentioned playing flow, thereby finishes the switching of channel.And whole playing flow restart the time delay that must cause between the switching channels, make the user after carrying out the channel handover operation, need to postpone a period of time and just can see the program of target channel, and the human eye during this period of time that postpones can significantly be felt.
Simultaneously, in the multimedia broadcasting process, every 1 second transmission primaries data, if the moment that the moment of user's switching channels is the transfer of data of this second just finishes, the channel data that receives new switching so will wait 1 second time nearly, this time delay between the switching channels that just extended again.In addition, because in the handoff procedure, the data of current channel stop to receive, may cause the data division decoding failure of present frame picture, and new channel data is not finished decoding as yet, therefore can cause serious mosaic phenomenon, influences user's experience.
Summary of the invention
In view of this, the invention provides a kind of method and multi-medium broadcasting receiving terminal of realizing that television channel switches, when switching to specified channel, can reduce handoff delay.
For achieving the above object, the present invention adopts following technical scheme:
A kind of method that realizes that television channel switches comprises:
A, determine the channel at current broadcasting channel data source place and the channel at the specified channel data source place that sets in advance, described specified channel is one or more channels;
B, to the data parallel of the data of current broadcasting channel data source place channel and described specified channel data source place channel receive, channel-decoding and buffer memory, and the data of the current broadcasting channel data source place channel of buffer memory are carried out data demultiplexing, audio/video decoding and broadcast;
C, after broadcasting channel switches to arbitrary specified channel, directly the data of described arbitrary specified channel data source place channel of buffer memory are handled and are play.
Preferably, described directly the data of described arbitrary specified channel data source place channel of buffer memory are handled and are play be:
Directly the data of described arbitrary specified channel data source place channel of buffer memory are carried out data demultiplexing, audio/video decoding and broadcast.
Preferably, further comprise among the step b: when the data of carrying out described current broadcasting channel data source place channel to buffer memory are carried out data demultiplexing and audio/video decoding, the data of described arbitrary specified channel data source place channel of buffer memory are carried out data demultiplexing and audio/video decoding;
Directly the data of the specified channel data source place channel of buffer memory are handled and play described in the step c and be: the data of described arbitrary specified channel data source place channel of handling behind the buffer memory, through data demultiplexing and audio/video decoding are play.
Preferably, the described specified channel that sets in advance is: import the specified channel that is provided with by the user in advance; Perhaps, the automatic specified channel that is provided with of system.
Preferably, described specified channel is the last channel and/or back one channel of current broadcasting channel.
Preferably, this method further comprises:
Detect the channel switching signal in real time;
When not detecting the channel switching signal, execution in step d: the data to current broadcasting channel data source place channel receive, channel-decoding, buffer memory, data demultiplexing, audio/video decoding and broadcast;
When detecting the channel switching signal, execution in step a, b and c, till in Preset Time, not detecting the channel switching signal again, beginning execution in step d.
A kind of multi-medium broadcasting receiving terminal, comprise: dispensing unit, a plurality of receiving element, a plurality of channel-decodings unit, a plurality of buffer unit, message source process unit, audio frequency and video broadcast unit and switch control unit, described a plurality of receiving element connects in described a plurality of channel-decodings unit separately, and described a plurality of channel-decodings unit connects in described a plurality of buffer unit separately;
Described dispensing unit is used for the specified channel that each receiving element is set to corresponding current broadcasting channel or sets in advance;
Arbitrary receiving element is used to receive the data of the data source place channel of corresponding channel, and sends to coupled channel-decoding unit;
Arbitrary channel-decoding unit is used for the data that receive are carried out channel-decoding, and is buffered in the coupled buffer unit;
Arbitrary buffer unit is used for the data that buffer memory receives;
Described switch control unit, be used for the receiving channels switching signal, receiving before the channel switching signal determines to switch to arbitrary specified channel, control described message source process unit the data cached of buffer unit that is used for the described current broadcasting channel data of buffer memory handled; Receiving after the channel switching signal determines to switch to described arbitrary specified channel, control described message source process unit the buffer unit institute data in buffer that is used for the described arbitrary specified channel data of buffer memory is handled;
Described audio frequency and video broadcast unit under the control of described switch control unit, to data cached data demultiplexing and the audio/video decoding of carrying out in the respective cache unit, is exported to the data behind the audio/video decoding in described message source process unit;
Described audio frequency and video broadcast unit, the data behind the audio/video decoding that is used for receiving carry out audio frequency and video and play.
Preferably, described message source process unit comprises data demultiplexing subelement and audio/video decoding subelement,
Described switch control unit, before receiving switching signal, controlling described data demultiplexing subelement links to each other with the buffer unit that is used for the described current broadcasting channel data of buffer memory, receiving after switching signal determines to switch to described arbitrary specified channel, control described data multiplex subelement and link to each other with the buffer unit that is used for the described arbitrary specified channel data of buffer memory;
Described data demultiplexing subelement is used for the data cached data demultiplexing that carries out of coupled buffer unit is also exported;
Described audio/video decoding subelement is used for the data of described channel-decoding unit output are carried out audio/video decoding, and sends to described audio frequency and video broadcast unit.
Preferably, described message source process unit comprises: a plurality of data demultiplexing subelements and a plurality of audio/video decoding subelement, described a plurality of buffer unit connects in described a plurality of data demultiplexing subelement separately, and described a plurality of data demultiplexing subelements connect in described a plurality of audio/video decoding subelement separately;
Described arbitrary data demultiplexing subelement is used for the data cached data demultiplexing that carries out to the buffer unit that links to each other with self, obtains data demultiplexing result, and sends to the audio/video decoding unit that links to each other with self;
Described switch control unit, before receiving switching signal, controlling described audio frequency and video broadcast unit links to each other with the audio/video decoding subelement that is used for described current broadcasting channel data are carried out audio/video decoding, receiving after switching signal determines to switch to described arbitrary specified channel, control described audio frequency and video broadcast unit and link to each other with the audio/video decoding subelement that is used for described arbitrary specified channel data are carried out audio/video decoding;
Described arbitrary audio/video decoding subelement is used for the data demultiplexing result who receives is carried out audio/video decoding, and under the control of described switch control unit, decoded result is exported to described audio frequency and video broadcast unit.
Preferably, this receiving terminal further comprises the advanced processing switch element, is used for the receiving channels switching signal, and before receiving the channel switching signal, the receiving element of corresponding each specified channel of control quits work; After receiving the channel switching signal, the receiving element of corresponding each specified channel of control is started working, up to do not receive the channel switching signal again in Preset Time till.
As seen from the above technical solution, among the present invention, set in advance specified channel, in Data Receiving of carrying out current broadcasting channel and decoding, carry out the Data Receiving and the channel-decoding of specified channel, and buffer memory channel-decoding result.After broadcasting channel switches to arbitrary specified channel, directly the data of this specified channel of buffer memory are handled and play.After adopting above-mentioned channel switching method, when switching to specified channel, can restart playing flow, and these specified channel data that directly will receive are before handled and play, thereby reduced handover delay.
Description of drawings
Fig. 1 is for realizing the method overview flow chart that television channel switches among the present invention.
Fig. 2 is the overall construction drawing of multi-medium broadcasting receiving terminal among the present invention.
Fig. 3 realizes the method overview flow chart that television channel switches in the embodiment of the invention one.
Fig. 4 is the overall construction drawing of multi-medium broadcasting receiving terminal in the embodiment of the invention one.
Fig. 5 realizes the method overview flow chart that television channel switches in the embodiment of the invention two.
Fig. 6 is the overall construction drawing of multi-medium broadcasting receiving terminal in the embodiment of the invention two.
Embodiment
For making purpose of the present invention, technological means and advantage clearer, the present invention is described in further details below in conjunction with accompanying drawing.
Basic thought of the present invention is: in advance the data to specified channel receive, processing such as decoding, thereby reduce handover delay.
In the multimedia broadcasting of CMMB, every one second transmission primaries data, because should long Data Transmission Feature at interval, make the CMMB terminal receive switching signal when restarting playing flow, need to wait for that the time of length just can receive data, so handover delay is obvious; Simultaneously, because channel circumstance more complicated, for realizing good transmission performance, the common more complicated of the chnnel coding of data source, the channel-decoding process of corresponding receiving terminal is relative complex also, make the CMMB terminal in the playing flow of restarting for switching, also need serial to finish comparatively complicated channel-decoding process after the received signal, this has increased handover delay again to a certain extent.
Though can clear and definite above-mentioned 2 problems that cause handover delay, the transmission time of CMMB system can't change on the one hand, therefore reduces handover delay and unrealistic by shortening the transmission time; In view of channel circumstance with to receiving performance demands, it is more limited therefore the channel coding/decoding process to be optimized the time delay reduction that is realized, also can't significantly improve user experience on the other hand.As seen, produce the angle of the handover delay origin cause of formation simply from direct elimination, can't obviously reduce handover delay.
Among the present invention, the current channel data are received, in the channel-decoding, to specified channel also parallelly receive, channel-decoding, thereby the specified channel data in advance is finished Data Receiving more consuming time and complicated channel-decoding processing, like this, dexterously the part-time of handover delay and processing time to the current channel data are balanced out, and then reduce handover delay greatly, and obviously improve user experience.
Fig. 1 is for realizing the method overview flow chart that television channel switches among the present invention.As shown in Figure 1, this method comprises:
Among the present invention, allow to be provided with the one or more specified channels that are different from current broadcasting channel.Being provided with of concrete this specified channel can be to utilize with the relation of current broadcasting channel to set, and for example, the last channel of current channel and/or back one channel also can adopt other modes to be provided with.When specifically being provided with, can be undertaken by user input, promptly the user imports the specified channel of desired setting by input unit, and system specifically is provided with according to the channel of user's input; Perhaps, more simply, by system specified channel is set automatically, the user can't change.
In this step, the data source place channel of specified channel and current broadcasting channel is all determined, received for follow-up data to specified channel and current broadcasting channel.
Step 102, data parallel to the data of current broadcasting channel data source place channel and described specified channel data source place channel receives, channel-decoding and buffer memory, and the data of the current broadcasting channel data source place channel of buffer memory are carried out data demultiplexing, audio/video decoding and broadcast.
In this step, to the data of current broadcasting channel data source place channel receive, a series of processing such as channel-decoding, buffer memory, data demultiplexing, audio/video decoding and broadcast, the processing of this part is identical with existing implementation.Simultaneously, receive in data current broadcasting channel data source place channel, when channel-decoding and buffer memory, parallel data to specified channel data source place channel receive, channel-decoding and buffer memory, so that after carrying out the channel switching, can directly utilize this data cached, and not need to receive again the data of corresponding channel.
By this step as seen, among the present invention, on the existing basis that current broadcasting channel data is received with Channel Processing, one or more reception and Channel Processing have been increased to the specified channel data, thereby reach the parallel processing purpose, and then reduce and handle time-delay.Wherein, one or more processing of increase can be adopted with existing the identical processing mode of current broadcasting channel data, is about to existing processing procedure and duplicates and finish.
Step 103 after broadcasting channel switches to arbitrary specified channel, is directly handled the data of described arbitrary specified channel data source place channel of buffer memory and play.
When carrying out after channel switches and switch in the specified channel of setting one, directly the data of finishing this specified channel behind the buffer memory of channel-decoding in the step 102 are handled and play, and do not need to restart playing flow.
So far, channel switching method flow process of the present invention finishes.The present invention also provides a kind of multi-medium broadcasting receiving terminal, can be used to implement the said method flow process.Fig. 2 is the overall construction drawing of multi-medium broadcasting receiving terminal among the present invention, as shown in Figure 2, this receiving terminal comprises: dispensing unit, a plurality of receiving element, a plurality of channel-decodings unit, a plurality of buffer unit, message source process unit, audio frequency and video broadcast unit and switch control unit.
In this receiving terminal, a plurality of receiving elements connect in a plurality of channel-decodings unit separately, a plurality of channel-decodings unit connects in a plurality of buffer units separately, thereby make each receiving element, channel-decoding unit and buffer unit constitute a Channel Processing link, each specified channel and current broadcasting channel all have each self-corresponding Channel Processing link.Wherein,
Dispensing unit is used for the specified channel that each receiving element is set to corresponding current broadcasting channel or sets in advance;
Each receiving element is used to receive the data of the data source place channel of corresponding channel, and sends to coupled channel-decoding unit;
Each channel-decoding unit is used for the data that receive are carried out channel-decoding, and is buffered in the coupled buffer unit;
Each buffer unit is used for the data that buffer memory receives;
Switch control unit is used to receive switching signal, before receiving switching signal, controls described message source process unit the data cached of buffer unit that is used for the described current broadcasting channel data of buffer memory handled; Receiving after switching signal determines to switch to described arbitrary specified channel, control described message source process unit the buffer unit institute data in buffer that is used for the described arbitrary specified channel data of buffer memory is handled;
Described audio frequency and video broadcast unit under the control of switch control unit, to data cached data demultiplexing and the audio/video decoding of carrying out in the respective cache unit, is exported to the data behind the audio/video decoding in the message source process unit;
Audio frequency and video broadcast unit, the data behind the audio/video decoding that is used for receiving carry out audio frequency and video and play.
In above-mentioned receiving terminal, the processing of a plurality of receiving elements can be identical, at channel number difference just, and its concrete processing can be adopted identical processing mode with the receiving element in the existing receiving terminal.In like manner, the processing of a plurality of channel-decodings unit, buffer unit also can be identical, and respectively with existing receiving terminal in channel-decoding unit, buffer unit adopt identical processing mode.
By the structure of said method flow process and receiving terminal as seen, channel switching mode among the present invention, reception and channel-decoding process with the switching channels that serial was carried out after the data of current channel stop to receive originally, become reception and channel-decoding process that the data parallel with current channel carries out, thereby greatly reduce handover delay.
In the describe, in general terms of the method for the invention described above and receiving terminal, before switching to specified channel, carry out the Data Receiving and the channel-decoding of specified channel, after switching to specified channel, the data of specified channel are directly handled and play.The mode of specifically directly handling can have two kinds, also the concrete structure of corresponding two kinds of message source process unit.A kind of mode is: the message source process part is finished by a covering device, and it selects the data of corresponding channel to carry out message source process such as data demultiplexing, audio/video decoding under the control of switching signal; Another way is: the message source process part is finished by many covering devices, the parallel message source process of carrying out current broadcasting channel and specified channel of these many covering devices, and under the control of switching signal, data are play behind the source coding of selection corresponding channel.Below be described in detail by the specific implementation of specific embodiment with regard to above-mentioned two kinds of processing modes.
In the following embodiments, switch to example and describe in the CMMB system, to carry out television channel.The multiple times user is when seeing TV, and changing platform all is from current channel, switches a channel forward or backward.At this most users custom, the specified channel of setting is the last channel and back one channel of current channel in the embodiment of the invention.
Embodiment one:
In the present embodiment, the message source process part is finished by a covering device, in the data processing to current channel and specified channel, have only Data Receiving, channel-decoding and buffer memory to walk abreast and finish, other message source process partly are to carry out separately at current channel or specified channel.
Fig. 3 realizes the implementation method flow chart that television channel switches in the embodiment of the invention one.As shown in Figure 3, this method comprises:
Step 301 determines that channel n is the data source of current broadcasting channel;
Step 301 ', determine that channel n-1 is the data source of first specified channel;
Step 301 ", determine that channel n+1 is the data source of second specified channel.
Step 301 ' and 301 " in concrete operations and step 301 can be identical.
Step 302 ', the data of the channel n-1 that per second is received are carried out channel-decoding and buffer memory;
Step 302 ' and 302 " in concrete operations and step 302 can be identical.
Step 302 ", the data of the channel n+1 that per second is received are carried out channel-decoding and buffer memory.
Step 302 ' and 302 " in concrete operations and step 301 can be identical.
Step 304～305 are to the data cached data demultiplexing and the audio/video decoding of carrying out of corresponding channel data source place channel.
Step 306 is carried out audio frequency and video to the audio/video decoding result and is play.
By said method, before carrying out the channel switching, the data to current broadcasting channel data source in step 304～305 are carried out data demultiplexing and audio/video decoding, thereby can play the signal of current broadcasting channel in step 306.When switch to last channel or after behind the channel, then promptly last channel or back one channel are carried out data demultiplexing and audio/video decoding carrying out channel-decoding and data in buffer before in step 304～305, thereby can play the signal last or back one channel that switches in step 306.
Fig. 4 is the concrete structure figure of multi-medium broadcasting receiving terminal in the present embodiment.As shown in Figure 4, this receiving terminal comprises: dispensing unit, a plurality of receiving element, a plurality of channel-decodings unit, a plurality of buffer unit, message source process unit, audio frequency and video broadcast unit and switch control unit.Wherein, the message source process unit specifically comprises a data demultiplexing subelement and an audio/video decoding subelement.
In this receiving terminal, the processing of dispensing unit, receiving element, channel-decoding unit, buffer unit, audio frequency and video broadcast unit is same as shown in Figure 2.Introduce the control of the function of each subelement in the information source processing unit and switch control unit below in detail to each subelement.
Switch control unit, before receiving switching signal, control data demultiplexing subelement links to each other with the buffer unit that is used for the current broadcasting channel data of buffer memory, receiving after switching signal determines to switch to last channel or back one channel, the multiplexing subelement of control data be used for buffer memory this last channel or afterwards the buffer unit of a channel data link to each other.
Data demultiplexing subelement is used for the data cached data demultiplexing that carries out of coupled buffer unit is also exported; The audio/video decoding subelement is used for the data of channel-decoding unit output are carried out audio/video decoding, and sends to the audio frequency and video broadcast unit.
By above-mentioned concrete receiving terminal, before switching, the multiplexing subelement of switch control unit control data links to each other with the buffer unit of buffer memory current channel data, thereby the channel-decoding data that receive current broadcasting channel are carried out the data demultiplexing, and export to the audio/video decoding subelement and carry out audio/video decoding.After switching to last channel or back one channel, the multiplexing subelement of switch control unit control data links to each other with the buffer unit of last channel of buffer memory or back one channel data, thereby the channel-decoding data that receive this last channel or back one channel are carried out the data demultiplexing, and export to the audio/video decoding subelement and carry out audio/video decoding.
The above-mentioned embodiment that is method and receiving terminal in the embodiment of the invention one.By as seen above-mentioned, in the present embodiment, only the Data Receiving of specified channel and channel-decoding have been carried out parallel processing with current channel, and message source process such as data demultiplexing, audio/video decoding remain and carry out after switching is finished.According to discovering, the processing delay of channel-decoding part is bigger, and relatively little many of the processing delay of message source process part, and the power consumption of message source process part is bigger, therefore the mode of only channel-decoding being carried out parallel processing in the present embodiment is preferred embodiment a kind of, can effectively control because the parallel power consumption of bringing is eliminated most processing delay simultaneously.
Embodiment two:
In the present embodiment, in the data processing to current channel and specified channel, whole processing of data transmit-receive, channel-decoding, buffer memory and source coding are all parallel to be finished.
Fig. 5 realizes the implementation method flow chart that television channel switches in the embodiment of the invention two.As shown in Figure 5, this method comprises:
Step 501 determines that channel n is the data source of current broadcasting channel;
Step 501 ', determine that channel n-1 is the data source of first specified channel;
Step 501 ", determine that channel n+1 is the data source of second specified channel.
Step 501 ' and 501 " in concrete operations and step 501 can be identical.
Step 502, the data of the channel n that per second is received are carried out channel-decoding and buffer memory;
Step 502 ', the data of the channel n-1 that per second is received are carried out channel-decoding and buffer memory;
Step 502 ", the data of the channel n+1 that per second is received are carried out channel-decoding and buffer memory.
Step 502 ' and 502 " in concrete operations and step 502 can be identical.
Data demultiplexing and audio/video decoding are carried out to the data of the channel n of buffer memory in step 503～504;
Step 503 '～504 ', the data of the channel n-1 of buffer memory are carried out data demultiplexing and audio/video decoding;
Step 503 "～504 " is carried out data demultiplexing and audio/video decoding to the data of the channel n+1 of buffer memory.
Step 503 '～504 ' and 503 "～504 " in concrete operations and step 503～504 can be identical.
Step 505, the monitoring switching signal, if receive the signal that switches to last channel or back one channel, then the audio/video decoding result with corresponding channel data source place channel carries out the processing of step 506, otherwise, the audio/video decoding result of current broadcasting channel data source place channel is carried out the processing of step 506.
Step 506 is carried out audio frequency and video to the audio/video decoding result of corresponding channel data source place channel and is play.
By said method, utilize respectively step 501～504,501 '～504 ', 501 "～504 " to the data of current broadcasting channel and each specified channel receive, the parallel processing of channel-decoding, data demultiplexing and audio/video decoding.And, before carrying out the channel switching, utilize the control of step 505, make that the signal to current broadcasting channel is play in step 506.When switch to last channel or after behind the channel, then utilize the control of step 505, make and can play the signal last or back one channel that switches in step 506.
Fig. 6 is the concrete structure figure of multi-medium broadcasting receiving terminal in the present embodiment.As shown in Figure 6, this receiving terminal comprises: dispensing unit, a plurality of receiving element, a plurality of channel-decodings unit, a plurality of buffer unit, message source process unit, audio frequency and video broadcast unit and switch control unit.Wherein, the message source process unit specifically comprises a plurality of data demultiplexing subelements and a plurality of audio/video decoding subelement, and, a plurality of buffer units connect in a plurality of data demultiplexing subelements separately, and a plurality of data demultiplexing subelements connect in described a plurality of audio/video decoding subelement separately.
In this receiving terminal, the processing of dispensing unit, receiving element, channel-decoding unit, buffer unit, audio frequency and video broadcast unit is same as shown in Figure 2.Introduce the control of the function of each subelement in the information source processing unit and switch control unit below in detail to each subelement.
Each data demultiplexing subelement is used for the data cached data demultiplexing that carries out to the buffer unit that links to each other with self, obtains data demultiplexing result, and sends to the audio/video decoding unit that links to each other with self;
Switch control unit, before receiving switching signal, controlling described audio frequency and video broadcast unit links to each other with the audio/video decoding subelement that is used for described current broadcasting channel data are carried out audio/video decoding, receiving after switching signal determines to switch to described arbitrary specified channel, control described audio frequency and video broadcast unit and link to each other with the audio/video decoding subelement that is used for described arbitrary specified channel data are carried out audio/video decoding;
Each audio/video decoding subelement is used for the data demultiplexing result who receives is carried out audio/video decoding, and under the control of described switch control unit, decoded result is exported to the audio frequency and video broadcast unit.
In above-mentioned message source process unit, the processing of a plurality of data demultiplexing subelements can be identical, and it is identical with the processing of data demultiplexing unit in the existing receiving terminal, the processing of a plurality of audio/video decoding subelements also can be identical, and identical with the processing of existing receiving terminal middle pitch video decoding unit.
By above-mentioned concrete receiving terminal, before switching, switch control unit control audio frequency and video broadcast unit links to each other with the audio/video decoding subelement that current broadcasting channel data is carried out audio/video decoding, thereby the audio/video decoding data that receive current broadcasting channel are play.After switching to last channel or back one channel, switch control unit control audio frequency and video broadcast unit links to each other with the audio/video decoding subelement that last channel or back one channel data is carried out audio/video decoding, thereby the audio/video decoding data that receive this a last channel or a back channel are play.
The above-mentioned embodiment that is method and receiving terminal in the embodiment of the invention two.By as seen above-mentioned, in the present embodiment, except that with embodiment one in identical Data Receiving and channel-decoding to specified channel carry out the parallel processing with current broadcasting channel, also further the data demultiplexing of specified channel and audio/video decoding are carried out parallel processing with current broadcasting channel.After switching is finished, play-over the data behind the audio/video decoding.Like this, than the mode of embodiment one, further reduced handover delay, still, the data demultiplexing and the audio/video decoding to specified channel of increase will cause bigger power consumption, and the handover delay that reduces is limited.When the user is very high to delay requirement, and power consumption required can to adopt this mode when low.Perhaps, can also in the foregoing description one and two dual modes, switch according to actual needs.
In addition, most users can carry out one time handover operation incessantly when carrying out the channel switching, may switch repeatedly, up to finding interested channel program.In view of this situation, the present invention changes on the basis of the foregoing description one and embodiment two, can control the advanced processing of channel-decoding, perhaps the advanced processing of channel-decoding and source coding is all controlled.
Particularly, in the present invention, detect the channel switching signal in real time, when not detecting the channel switching signal, channel-decoding, source coding etc. is not carried out advanced processing, only the data to current broadcasting channel receive, channel-decoding, buffer memory, data demultiplexing, audio/video decoding and broadcast; After detecting the channel switching signal, advanced processing is carried out in the reception, channel-decoding, source coding etc. that begin the specified channel data, i.e. processing such as the reception that the data and the specified channel data of current broadcasting channel are walked abreast, channel-decoding, and continue this advanced processing operation always, up in the regular hour, not detecting the channel switching signal again, illustrate that present user has found interested channel, so stop advanced processing to the specified channel data.
By the way, after the user begins frequently to carry out the channel switching, primary channel switching still can exist with the identical switching delay of prior art, but since the channel switching second time, owing to the data of specified channel have been carried out advanced processing, therefore can reduce the switching delay when switching to specified channel greatly.Simultaneously,, therefore can reduce the power consumption of bringing owing to advanced processing greatly, reach the purpose of economize on electricity because the advanced processing of specified channel is not carried out all the time.
Correspondingly, can comprise further in receiving terminal of the present invention being used for the receiving channels switching signal by the advanced processing switch element that before receiving the channel switching signal, the receiving element of corresponding each specified channel of control quits work; After receiving the channel switching signal, the receiving element of corresponding each specified channel of control is started working, up to do not receive the channel switching signal again in Preset Time till.
In the embodiment of the invention described above, be to be described as specified channel with the last channel of current channel and back one channel, in fact, the channel that also can set other is as specified channel, and concrete processing mode is same as described above, just repeats no more here.
By the specific implementation of the method for the invention described above and receiving terminal as seen, among the present invention, utilization is carried out parallel processing to the section processes and the current broadcasting channel of specified channel, thereby the time delay of original switching channels is reduced greatly, simultaneously, because the reduction of time-delay makes the almost imperceptible time delay of human eye, also can not differentiate the mosaic that the present frame picture causes owing to the partial decoding of h failure, thereby improve the user impression of user when watching multimedia broadcast television.
Being preferred embodiment of the present invention only below, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, a kind of method that realizes that television channel switches is characterized in that this method comprises:
A, determine the channel at current broadcasting channel data source place and the channel at the specified channel data source place that sets in advance, described specified channel is one or more channels;
B, to the data parallel of the data of current broadcasting channel data source place channel and described specified channel data source place channel receive, channel-decoding and buffer memory, and the data of the current broadcasting channel data source place channel of buffer memory are carried out data demultiplexing, audio/video decoding and broadcast;
C, after broadcasting channel switches to arbitrary specified channel, directly the data of described arbitrary specified channel data source place channel of buffer memory are handled and are play.
2, method according to claim 1 is characterized in that, described directly the data of described arbitrary specified channel data source place channel of buffer memory are handled and are play be:
Directly the data of described arbitrary specified channel data source place channel of buffer memory are carried out data demultiplexing, audio/video decoding and broadcast.
3, method according to claim 1, it is characterized in that, further comprise among the step b: when the data of carrying out described current broadcasting channel data source place channel to buffer memory are carried out data demultiplexing and audio/video decoding, the data of described arbitrary specified channel data source place channel of buffer memory are carried out data demultiplexing and audio/video decoding;
Directly the data of the specified channel data source place channel of buffer memory are handled and play described in the step c and be: the data of described arbitrary specified channel data source place channel of handling behind the buffer memory, through data demultiplexing and audio/video decoding are play.
According to arbitrary described method in the claim 1 to 3, it is characterized in that 4, the described specified channel that sets in advance is: import the specified channel that is provided with by the user in advance; Perhaps, the automatic specified channel that is provided with of system.
5, method according to claim 4 is characterized in that, described specified channel is the last channel and/or back one channel of current broadcasting channel.
6, according to arbitrary described method in the claim 1 to 3, it is characterized in that this method further comprises:
Detect the channel switching signal in real time;
When not detecting the channel switching signal, execution in step d: the data to current broadcasting channel data source place channel receive, channel-decoding, buffer memory, data demultiplexing, audio/video decoding and broadcast;
When detecting the channel switching signal, execution in step a, b and c, till in Preset Time, not detecting the channel switching signal again, beginning execution in step d.
7, a kind of multi-medium broadcasting receiving terminal, it is characterized in that, this receiving terminal comprises: dispensing unit, a plurality of receiving element, a plurality of channel-decodings unit, a plurality of buffer unit, message source process unit, audio frequency and video broadcast unit and switch control unit, described a plurality of receiving element connects in described a plurality of channel-decodings unit separately, and described a plurality of channel-decodings unit connects in described a plurality of buffer unit separately;
Described dispensing unit is used for the specified channel that each receiving element is set to corresponding current broadcasting channel or sets in advance;
Arbitrary receiving element is used to receive the data of the data source place channel of corresponding channel, and sends to coupled channel-decoding unit;
Arbitrary channel-decoding unit is used for the data that receive are carried out channel-decoding, and is buffered in the coupled buffer unit;
Arbitrary buffer unit is used for the data that buffer memory receives;
Described switch control unit, be used for the receiving channels switching signal, receiving before the channel switching signal determines to switch to arbitrary specified channel, control described message source process unit the data cached of buffer unit that is used for the described current broadcasting channel data of buffer memory handled; Receiving after the channel switching signal determines to switch to described arbitrary specified channel, control described message source process unit the buffer unit institute data in buffer that is used for the described arbitrary specified channel data of buffer memory is handled;
Described audio frequency and video broadcast unit under the control of described switch control unit, to data cached data demultiplexing and the audio/video decoding of carrying out in the respective cache unit, is exported to the data behind the audio/video decoding in described message source process unit;
Described audio frequency and video broadcast unit, the data behind the audio/video decoding that is used for receiving carry out audio frequency and video and play.
8, receiving terminal according to claim 7 is characterized in that, described message source process unit comprises data demultiplexing subelement and audio/video decoding subelement,
Described switch control unit, before receiving switching signal, controlling described data demultiplexing subelement links to each other with the buffer unit that is used for the described current broadcasting channel data of buffer memory, receiving after switching signal determines to switch to described arbitrary specified channel, control described data multiplex subelement and link to each other with the buffer unit that is used for the described arbitrary specified channel data of buffer memory;
Described data demultiplexing subelement is used for the data cached data demultiplexing that carries out of coupled buffer unit is also exported;
Described audio/video decoding subelement is used for the data of described channel-decoding unit output are carried out audio/video decoding, and sends to described audio frequency and video broadcast unit.
9, receiving terminal according to claim 7, it is characterized in that, described message source process unit comprises: a plurality of data demultiplexing subelements and a plurality of audio/video decoding subelement, described a plurality of buffer unit connects in described a plurality of data demultiplexing subelement separately, and described a plurality of data demultiplexing subelements connect in described a plurality of audio/video decoding subelement separately;
Described arbitrary data demultiplexing subelement is used for the data cached data demultiplexing that carries out to the buffer unit that links to each other with self, obtains data demultiplexing result, and sends to the audio/video decoding unit that links to each other with self;
Described switch control unit, before receiving switching signal, controlling described audio frequency and video broadcast unit links to each other with the audio/video decoding subelement that is used for described current broadcasting channel data are carried out audio/video decoding, receiving after switching signal determines to switch to described arbitrary specified channel, control described audio frequency and video broadcast unit and link to each other with the audio/video decoding subelement that is used for described arbitrary specified channel data are carried out audio/video decoding;
Described arbitrary audio/video decoding subelement is used for the data demultiplexing result who receives is carried out audio/video decoding, and under the control of described switch control unit, decoded result is exported to described audio frequency and video broadcast unit.
10, according to arbitrary described receiving terminal in the claim 7 to 9, it is characterized in that this receiving terminal further comprises the advanced processing switch element, be used for the receiving channels switching signal, before receiving the channel switching signal, the receiving element of corresponding each specified channel of control quits work; After receiving the channel switching signal, the receiving element of corresponding each specified channel of control is started working, up to do not receive the channel switching signal again in Preset Time till.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA200810227804XA CN101426110A (en) | 2008-11-28 | 2008-11-28 | Method for implementing television channel switch and multimedia broadcast receiving terminal |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA200810227804XA CN101426110A (en) | 2008-11-28 | 2008-11-28 | Method for implementing television channel switch and multimedia broadcast receiving terminal |
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| CN101426110A true CN101426110A (en) | 2009-05-06 |
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| CNA200810227804XA Pending CN101426110A (en) | 2008-11-28 | 2008-11-28 | Method for implementing television channel switch and multimedia broadcast receiving terminal |
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