CN102685549B - Real-time and non-real time program content switching method and device in voice broadcasting of train - Google Patents
Real-time and non-real time program content switching method and device in voice broadcasting of train Download PDFInfo
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Abstract
The invention discloses a real-time and non-real time program content switching method and a real-time and non-real time program content switching device in the voice broadcasting of a train; the method comprises the following steps that: in the real-time broadcasting state of the train, the state of cache data of the real-time broadcasting of the train is judged; when the duration in which the state of the cache data is a cache empty state is determined to reach a first preset time, the broadcasting of the train is switched from a real-time broadcasting state to a cache playing state, and cushion field materials which are pre-stored in the cache are started and played; in the cache playing state, the available cache state of the real-time broadcasting of the train is judged; and when the duration of the available cache is determined to reach a second preset time, the broadcasting of the train is switched from the cache playing state to the real-time broadcasting state, and the real-time broadcasting of the train is played. Through the processing method, the seamless playing of the voice broadcasting of the train is realized.
Description
Technical field
The present invention relates to multimedia broadcasting field, particularly relate to the real-time and non real-time programme content switching method and apparatus of a kind of train sound radio.
Background technology
At present, by multi-channel time-delay time diversity mechanism, the nothing of train under most tunnels circumstance of occlusion can be realized and interrupt real-time broadcast.Multi-channel time-delay time diversity mechanism with real time programme by time delay for cost, solve the tunnel occlusion issue under most actual environment.
Real-time audio signal is carried out the time delay at equal intervals of N road by multi-channel time-delay time diversity mechanism, and system is broadcasted and postponed a maximum road signal, and by other N road signal storage real-time and that delay is less in the buffer, as the backup postponing peak signal.When this road signal occurs to interrupt, receiver is extracted valid data from the backup signal of N road, is spliced by code stream, solves short period signal and blocks the receive interruption problem caused.
The performance of multi-channel time-delay time diversity mechanism is mainly by the impact of two parameters: a parameter is time of delay, refer to the interval of first via diversity signal to last road diversity signal time of delay, larger time of delay can resist longer tunnel, if but time of delay is excessive, the ageing of Broadcast Journalism can be reduced.Another parameter is the interval of adjacent two-way in multichannel diversity signal, that is, time window thresholding.Time window thresholding is less, means that receiver splices the time that complete code stream is full of required for buffer memory shorter.Wherein, N postpones way, and larger delay way means more data backup more, but volume of transmitted data also increases thereupon.
But in actual applications, when Super Long Tunnel, super-intensive tunnel group etc. are rare, multi-channel time-delay time diversity mechanism still can not avoid the disruption of train satellite real-time broadcast completely.Below with T time of delay
delaythe 10 road delay time diversity mechanism of=10min are described the technical problem existed in prior art for example.
If length of tunnel t
tunnelexceed T time of delay that multi-channel time-delay time diversity mechanism is given
delay, i.e. t
tunnel> T
delay, so will there is signal interruption in train real time broadcasting system, break period t
mute=t
tunnel-T
delay.Fig. 1 is the schematic diagram that in prior art, Super Long Tunnel causes train real-time broadcast signal to interrupt, and as shown in Figure 1, train by way of 20 minutes long tunnel, and normally receives before entering tunnel always.So first 10 minutes train real-time broadcast normal play in tunnel, within latter 10 minutes, signal will interrupt.Until gone out tunnel, disruption just can have been recovered.
If the interval t between tunnel
opentoo compact intensive, than time window thresholding T
delay/ N is also little, i.e. t
open< T
delay/ N, so train real-time broadcast signal just there will be burr phenomena, and each signal burr duration is T
delay/ N-t
open, jagged duration summation is t
mute=T
delay-Nt
open.Fig. 2 is the schematic diagram that in prior art, ultra dense tunnel group causes train real-time broadcast signal to interrupt, as shown in Figure 2, train, continuously across 10 minutes long tunnels 1 and 2, have the normal time of reception of 1 minute, 40 seconds respectively, and time window thresholding is 1 minute before two tunnels.Train real-time broadcast signal can not interrupt in tunnel 1, but in tunnel 2, along with receiver buffer memory is cleared, and goes out 40 seconds of entering before tunnel 2, tunnel 1 and is less than time window thresholding, cause train real-time broadcast signal there will be burr phenomena.Signal has interrupted 10 times altogether, and each lasting 20 seconds, until gone out tunnel, burr phenomena just can terminate.
Summary of the invention
The invention provides the real-time and non real-time programme content switching method and apparatus of a kind of train sound radio, in order to solve in prior art under train passes the situation such as Super Long Tunnel or super-intensive tunnel group, the problem that multi-channel time-delay time diversity mechanism can not avoid train satellite real-time broadcast to interrupt completely.
The invention provides the real-time and non real-time programme content changing method of a kind of train sound radio, the method comprises lower column processing:
Under train real-time broadcast state, the data cached state of train real-time broadcast is judged, when determining that data cached state is when duration of buffer memory empty reaching for first scheduled time, broadcasting for train is switched to buffer memory broadcast state by train real-time broadcast state, start the pad field material prestored in the buffer, and play pad field material;
Under buffer memory broadcast state, the available cache memory state of train real-time broadcast is judged, when determining that the duration of available cache memory reached for second scheduled time, broadcasting for train being switched to train real-time broadcast state by buffer memory broadcast state, and playing train real-time broadcast.
The present invention also provides train sound radio real-time and non real-time programme content switching device shifter, and this device comprises:
First handover module, for under train real-time broadcast state, the data cached state of train real-time broadcast is judged, when determining that data cached state is when duration of buffer memory empty reaching for first scheduled time, broadcasting for train is switched to buffer memory broadcast state by train real-time broadcast state, start the pad field material prestored in the buffer, and call the first playing module;
First playing module, for playing pad field material;
Second handover module, for under buffer memory broadcast state, the available cache memory state of train real-time broadcast is judged, when determining that the duration of available cache memory reached for second scheduled time, broadcasting for train is switched to train real-time broadcast state by buffer memory broadcast state, and calls the second playing module;
Second playing module, for playing train real-time broadcast.
Beneficial effect of the present invention is as follows:
The embodiment of the present invention is on the basis of multi-channel time-delay time diversity mechanism, pad field program material that arrange a kind of novelty, that be applicable to broadcasting for train actual application environment, and pad field material and the mutual handover mechanism of real-time broadcast signal are introduced in design, to solve in prior art at train through in the situation such as Super Long Tunnel or super-intensive tunnel group, the problem that multi-channel time-delay time diversity mechanism can not avoid train satellite real-time broadcast to interrupt completely, really achieves the seamless broadcast of broadcasting for train.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that in prior art, Super Long Tunnel causes train real-time broadcast signal to interrupt;
Fig. 2 is the schematic diagram that in prior art, ultra dense tunnel group causes train real-time broadcast signal to interrupt;
Fig. 3 is the flow chart according to the real-time and non real-time programme content changing method of the train sound radio of the embodiment of the present invention;
Fig. 4 is the schematic diagram of the Super Long Tunnel handover mechanism of the embodiment of the present invention;
Fig. 5 is the schematic diagram of the super-intensive tunnel group switching example 1 of the embodiment of the present invention;
Fig. 6 is the schematic diagram of the super-intensive tunnel group switching example 2 of the embodiment of the present invention;
Fig. 7 is the schematic diagram of the super-intensive tunnel group switching example 3 of the embodiment of the present invention;
Fig. 8 is the structural representation according to the real-time and non real-time programme content switching device shifter of the train sound radio of the embodiment of the present invention.
Embodiment
In order to solve in prior art at train through in the situation such as Super Long Tunnel or super-intensive tunnel group, the problem that multi-channel time-delay time diversity mechanism can not avoid train satellite real-time broadcast to interrupt completely, the invention provides the real-time and non real-time programme content changing method of a kind of train sound radio and device, below in conjunction with accompanying drawing and embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, do not limit the present invention.
Embodiment of the method
According to embodiments of the invention, provide the real-time and non real-time programme content changing method of a kind of train sound radio, the method may be used for the broadcasting for train of multi-channel time-delay time diversity mechanism, is also applicable to the broadcasting for train not adopting multi-channel time-delay mechanism.Fig. 3 is the flow chart according to the real-time and non real-time programme content changing method of the train sound radio of the embodiment of the present invention, as shown in Figure 3, comprises according to the real-time and non real-time programme content changing method of the train sound radio of the embodiment of the present invention:
Step 301, under train real-time broadcast state, the data cached state of train real-time broadcast is judged, when determining that data cached state is when duration of buffer memory empty reaching for first scheduled time, broadcasting for train is switched to buffer memory broadcast state by train real-time broadcast state, start the pad field material prestored in the buffer, and play pad field material; Above-mentioned pad field material can comprise film clips and music.
On the other hand, be switched to the startup of pad field material from train real-time broadcast according to being judge that splicing is without data time (that is, data cached state is the duration of buffer memory empty), this time can artificially be arranged, in embodiments of the present invention, this time was 5 seconds.
It should be noted that, consider the restriction of FLASH memory space, pad field SoundBreeze Clubtunes for a long time can not be stored.Therefore, in embodiments of the present invention, for the interruption of different duration, one section of music of releiving of 60 seconds can being selected, can loop play feeling without obviously interrupting.In addition, in order to embody the characteristic of broadcasting for train, one section of film clips of 20 seconds can also before the music of releiving of 60 seconds, be added.Film clips are only broadcast once at every turn, music broadcasting capable of circulation afterwards.Like this, the time span of pad field material is 80 seconds, is made up of 20 seconds film clips and 60 seconds music two parts, and the beginning of pad field material and end are made as 5 seconds is fade-in fade-out.
In step 301, when playing pad field material, the film clips of a time 20 seconds can be play, and the loop play music of 60 seconds.
Step 302, under buffer memory broadcast state, the available cache memory state of train real-time broadcast is judged, when determining that the duration of available cache memory reached for second scheduled time, broadcasting for train is switched to train real-time broadcast state by buffer memory broadcast state, and plays train real-time broadcast.
Preferably, in embodiments of the present invention, can play when after the material of foremast field, then play train real-time broadcast.
It should be noted that, above-mentioned second scheduled time is time window thresholding, and wherein, time window thresholding is the snooze interval of adjacent two-way in the multichannel diversity signal of multi-channel time-delay time diversity mechanism.
On the other hand, the startup being switched to train real-time broadcast from pad field material is according to can be judge whether continue locking time (that is, the duration of available cache memory) reaches time window thresholding T
delay/ N, in embodiments of the present invention, time window thresholding can be 1 minute.
In sum, in actual applications, can be judged data cached state by real-time receivers, when the existence persistent cache dummy status of 5 seconds, buffer memory broadcast state is switched to by train real-time broadcast, start the broadcasting of pad field material, film clips are play once, music broadcasting capable of circulation, the state of available cache memory is monitored in the process play, lock-out state timing can be passed through, if the lock-out state duration reaches the requirement of time window thresholding complete broadcasting in 1 minute, then after pad field material finishes, be switched to train real-time broadcast, otherwise next cycle of still continuing pad field material music broadcasts.
Can be found out by above-mentioned process, due to the introducing of pad field mechanism, make train real-time broadcast can automatically switch to pad field material when being subject to blocking interruption, after not blocked, automatically switching back to real-time broadcast again.Once by reference to the accompanying drawings and example, technique scheme of the present invention is illustrated.
Fig. 4 is the schematic diagram of the Super Long Tunnel handover mechanism of the embodiment of the present invention, and as shown in Figure 4, train normally receives before entering the tunnel of 20 minutes always, and attendant does not have manual operation yet.First 10 minutes then in tunnel is real time programme normal play, after quiet 5 seconds, transition is 20 seconds film clips, train in tunnel latter 575 seconds and play 10 times music in after rolling tunnel away from 25 seconds, because train is still not enough to when 25 seconds judge whether time window can reach 1 minute after rolling tunnel away from, therefore need to continue broadcasting 1 time music.Train after rolling tunnel away from when 60 seconds discovery time window reach 60 seconds, finish all over music because of these this, after namely rolling tunnel away from, when 85 seconds, be switched to real-time broadcast.
Fig. 5 is the schematic diagram of the super-intensive tunnel group switching example 1 of the embodiment of the present invention, as shown in Figure 5, the omnidistance normal reception in section 1, section 2 plays 20 seconds in real time, and then after quiet 5 seconds, transition is 20 seconds film clips, and latter 575 seconds loop play 10 times music also take the 325 second time of section, section 3 still can not judge that time window is enough when 25 seconds after playing music, therefore continue to play 60s music, until discovery time window was more than 60 seconds, the time normal play real time programme always of follow-up 575 seconds.
Fig. 6 is the schematic diagram of the super-intensive tunnel group switching example 2 of the embodiment of the present invention, as shown in Figure 6, section 1 normal play 600s in tunnel, interrupt 3 seconds, less than the thresholding starting pad field material, therefore normal play 20 seconds is continued in real time in section 2, then after quiet 5 seconds, transition is film clips, latter 575 seconds loop play 10 times music also take the 325 second time of section, section 3 still can not judge that time window is enough when 25 seconds after playing music, therefore continue to play 60s music, until discovery time window was more than 60 seconds, the time normal play real time programme always of follow-up 575 seconds.
Fig. 7 is the schematic diagram of the super-intensive tunnel group switching example 3 of the embodiment of the present invention, and as shown in Figure 7, section 1 normal play 600s in tunnel, interrupts 5 seconds, starts film clips; Section 2 continues to play latter 15 seconds of film clips, and starts to play music, because the time window in section 2 was less than 60 seconds, therefore music always loop play go down, latter 625 seconds of section 2 and first 35 seconds of section 3 broadcasting 11 times music altogether; Section 3 still can not judge that time window is enough when 35 seconds after playing music, therefore continues to play 60s music, until discovery time window was more than 60 seconds, therefore section 3 time-switching of follow-up 565 seconds is to broadcasting real time programme.
As can be seen from Fig. 5, Fig. 6, Fig. 7, the difference when difference of tunnel 1 length result in train real-time broadcast and pads the switching of field material, confirm the mechanism of the embodiment of the present invention when tunnel environment complicated and changeable, the sweetly disposition ability himself had.
The embodiment of the present invention is on the basis of multi-channel time-delay time diversity mechanism, and what solve that self institute of multi-channel time-delay time diversity mechanism can not solve completely breaks problem, is effectively supplementary to one of multi-channel time-delay time diversity mechanism.The pad field material design that film clips add broadcasting music capable of circulation both left space to the brand and cultural connotation that promote broadcasting for train, also embodies the flexibility of pad field broadcast, entirety and details meet the needs of the seamless broadcast of broadcasting for train effectively.Based on the comprehensive handover mechanism that buffer status is judged ensure that to the full extent train sound radio continuity, switch the instantaneity of transition and the priority of naturality and real-time broadcast.Along with the introducing of this pad field material and handover mechanism thereof, broadcasting for train will break away from the embarrassment broken for a long time, and the agitation sense that sound burr brings, and mass audience will obtain hearing enjoying more easily on the road.
Device embodiment
According to embodiments of the invention, provide the real-time and non real-time programme content switching device shifter of a kind of train sound radio, this device may be used for the broadcasting for train of multi-channel time-delay time diversity mechanism, is also applicable to the broadcasting for train not adopting multi-channel time-delay mechanism.Fig. 8 is the structural representation according to the real-time and non real-time programme content switching device shifter of the train sound radio of the embodiment of the present invention, as shown in Figure 8, comprise according to the real-time and non real-time programme content switching device shifter of the train sound radio of the embodiment of the present invention: the first handover module 80, first playing module 82, second handover module 84, second playing module 86.Below, the real-time and non real-time programme content switching device shifter of the train sound radio of the embodiment of the present invention is described in detail.
First handover module 80, for under train real-time broadcast state, the data cached state of train real-time broadcast is judged, when determining that data cached state is when duration of buffer memory empty reaching for first scheduled time, broadcasting for train is switched to buffer memory broadcast state by train real-time broadcast state, start the pad field material prestored in the buffer, and call the first playing module 82; Above-mentioned pad field material comprises film clips and music.
On the other hand, the startup foundation that broadcasting for train is switched to buffer memory broadcast state by train real-time broadcast state by the first handover module 80 can be judge splicing without data time (namely, data cached state is the duration of buffer memory empty), this time can artificially be arranged, in embodiments of the present invention, this time was 5 seconds.
It should be noted that, consider the restriction of FLASH memory space, pad field SoundBreeze Clubtunes for a long time can not be stored.Therefore, in embodiments of the present invention, for the interruption of different duration, one section of music of releiving of 60 seconds can being selected, can loop play feeling without obviously interrupting.In addition, in order to embody the characteristic of broadcasting for train, one section of film clips of 20 seconds can also before the music of releiving of 60 seconds, be added.Film clips are only broadcast once at every turn, music broadcasting capable of circulation afterwards.Like this, the time span of pad field material is 80 seconds, is made up of 20 seconds film clips and 60 seconds music two parts, and the beginning of pad field material and end are made as 5 seconds is fade-in fade-out.
First playing module 82, for playing pad field material; Preferably, the first playing module 82, when playing pad field material, can play the film clips of a time 20 seconds, and the loop play music of 60 seconds.
Second handover module 84, for under buffer memory broadcast state, the available cache memory state of train real-time broadcast is judged, when determining that the duration of available cache memory reached for second scheduled time, broadcasting for train is switched to train real-time broadcast state by buffer memory broadcast state, and calls the second playing module 86;
It should be noted that, above-mentioned second scheduled time is time window thresholding, and wherein, time window thresholding is the snooze interval of adjacent two-way in the multichannel diversity signal of multi-channel time-delay time diversity mechanism.
On the other hand, the startup foundation that broadcasting for train is switched to train real-time broadcast state by buffer memory broadcast state by the second handover module 84 can be judge whether continue locking time (that is, the duration of available cache memory) reaches time window thresholding T
delay/ N, in embodiments of the present invention, time window thresholding can be 1 minute.
Second playing module 86, for playing train real-time broadcast.Preferably, in embodiments of the present invention, the second playing module 86 can play when after the material of foremast field, then plays train real-time broadcast.
In actual applications, can be judged data cached state by real-time receivers, when the existence persistent cache dummy status of 5 seconds, buffer memory broadcast state is switched to by train real-time broadcast, start the broadcasting of pad field material, film clips are play once, music broadcasting capable of circulation, the state of available cache memory is monitored in the process play, lock-out state timing can be passed through, if the lock-out state duration reaches the requirement of time window thresholding complete broadcasting in 1 minute, then after pad field material finishes, be switched to train real-time broadcast, otherwise next cycle of still continuing pad field material music broadcasts.
By to pad field material and the applied analysis of handover mechanism under Super Long Tunnel and super-intensive tunnel scene thereof, transition effectively can be achieved between real time programme and pad field program.
The pad field material design that film clips add broadcasting music capable of circulation effectively meets the needs of the seamless broadcast of broadcasting for train in overall and details.The material of 80 seconds can not take the too many space of FLASH; Film clips design and leave space to the brand and cultural connotation that promote broadcasting for train; Within 1 minute, cycle music embodies the flexibility of pad field broadcast, can meet the pad field demand of different duration; Music is complete to be finished and just can switch back in real time, avoids allowing audience feel substantial interruption; Design of being fade-in fade-out avoids the stiff sensation switching and may bring.
And comprise based on the comprehensive handover mechanism judged buffer status: buffer memory empties rear and continues 5 seconds by being switched to pad field in real time; Reach time window thresholding lasting locking time to be switched in real time by pad field for 1 minute.This cover mechanism ensure that to the full extent train sound radio continuity, switch the instantaneity of transition and the priority of naturality and real-time broadcast.
Although be example object, disclose the preferred embodiments of the present invention, it is also possible for those skilled in the art will recognize various improvement, increase and replacement, and therefore, scope of the present invention should be not limited to above-described embodiment.
Claims (8)
1. the real-time and non real-time programme content changing method of train sound radio, it is characterized in that, described method comprises lower column processing:
Under train real-time broadcast state, the data cached state of train real-time broadcast is judged, when determining that described data cached state is when duration of buffer memory empty reaching for first scheduled time, broadcasting for train is switched to buffer memory broadcast state by train real-time broadcast state, start the pad field material prestored in the buffer, and play described pad field material;
Under described buffer memory broadcast state, the available cache memory state of described train real-time broadcast is judged, when determining that the duration of available cache memory reached for second scheduled time, described broadcasting for train is switched to described train real-time broadcast state by described buffer memory broadcast state, and play train real-time broadcast, wherein, described second scheduled time is time window thresholding, wherein, described time window thresholding is the snooze interval of adjacent two-way in the multichannel diversity signal of multi-channel time-delay time diversity mechanism.
2. the method for claim 1, is characterized in that, described pad field material comprises: film clips and music, and to be fade-in fade-out process to the beginning and end of described pad field material.
3. method as claimed in claim 2, is characterized in that, play described pad field material and comprise:
Play once described film clips;
Music described in loop play.
4. the method for claim 1, is characterized in that, described broadcasting train real-time broadcast comprises:
Playing when after the material of foremast field, play described train real-time broadcast.
5. the real-time and non real-time programme content switching device shifter of train sound radio, it is characterized in that, described device comprises:
First handover module, for under train real-time broadcast state, the data cached state of train real-time broadcast is judged, when determining that described data cached state is when duration of buffer memory empty reaching for first scheduled time, broadcasting for train is switched to buffer memory broadcast state by train real-time broadcast state, start the pad field material prestored in the buffer, and call the first playing module;
Described first playing module, for playing described pad field material;
Second handover module, for under described buffer memory broadcast state, the available cache memory state of described train real-time broadcast is judged, when determining that the duration of available cache memory reached for second scheduled time, described broadcasting for train is switched to described train real-time broadcast state by described buffer memory broadcast state, and call the second playing module, wherein, described second scheduled time is time window thresholding, wherein, described time window thresholding is the snooze interval of adjacent two-way in the multichannel diversity signal of multi-channel time-delay time diversity mechanism;
Described second playing module, for playing train real-time broadcast.
6. device as claimed in claim 5, it is characterized in that, described pad field material comprises: film clips and music, and the beginning and end of described pad field material is for being fade-in fade-out.
7. device as claimed in claim 6, is characterized in that, described first playing module specifically for:
Play once described film clips; Music described in loop play.
8. device as claimed in claim 5, is characterized in that, described second playing module specifically for:
Play when after the material of foremast field at described first playing module, play described train real-time broadcast.
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| CN201110058301.6A CN102685549B (en) | 2011-03-11 | 2011-03-11 | Real-time and non-real time program content switching method and device in voice broadcasting of train |
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| CN103634400B (en) * | 2013-11-29 | 2017-10-31 | 深圳市航盛电子股份有限公司 | A kind of data receiver caching method |
| CN108377409A (en) * | 2018-03-05 | 2018-08-07 | 广东欧珀移动通信有限公司 | A kind of seamless play method, terminal device and the storage medium of multimedia file |
| CN114697882A (en) * | 2022-04-27 | 2022-07-01 | 上海寰创通信科技股份有限公司 | Train real-time broadcasting system and method in unmanned scene |
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| CN1622616A (en) * | 2003-11-28 | 2005-06-01 | 皇家飞利浦电子股份有限公司 | A broadcast method and system for digital program |
| CN101282470A (en) * | 2008-05-09 | 2008-10-08 | 中兴通讯股份有限公司 | Medium play method and apparatus |
| CN101330340A (en) * | 2008-07-31 | 2008-12-24 | 中兴通讯股份有限公司 | Method for self-adaption adjusting receiving speed to buffer play by a mobile multimedia broadcast terminal |
| WO2010122739A1 (en) * | 2009-04-20 | 2010-10-28 | 三菱電機株式会社 | Navigation device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1622616A (en) * | 2003-11-28 | 2005-06-01 | 皇家飞利浦电子股份有限公司 | A broadcast method and system for digital program |
| CN101282470A (en) * | 2008-05-09 | 2008-10-08 | 中兴通讯股份有限公司 | Medium play method and apparatus |
| CN101330340A (en) * | 2008-07-31 | 2008-12-24 | 中兴通讯股份有限公司 | Method for self-adaption adjusting receiving speed to buffer play by a mobile multimedia broadcast terminal |
| WO2010122739A1 (en) * | 2009-04-20 | 2010-10-28 | 三菱電機株式会社 | Navigation device |
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