CN101287079A - Transmission method, system and device for broadcast television signal - Google Patents
Transmission method, system and device for broadcast television signal Download PDFInfo
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- CN101287079A CN101287079A CNA2008100997058A CN200810099705A CN101287079A CN 101287079 A CN101287079 A CN 101287079A CN A2008100997058 A CNA2008100997058 A CN A2008100997058A CN 200810099705 A CN200810099705 A CN 200810099705A CN 101287079 A CN101287079 A CN 101287079A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000001360 synchronised effect Effects 0.000 claims abstract description 32
- 238000001914 filtration Methods 0.000 claims abstract description 26
- 238000012545 processing Methods 0.000 claims description 14
- 230000003321 amplification Effects 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 abstract description 2
- 238000001228 spectrum Methods 0.000 description 7
- 238000012986 modification Methods 0.000 description 3
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- 239000013307 optical fiber Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
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Abstract
The invention discloses a transmission method of broadcasting TV signals, a system and a device thereof, which pertains to the communication technical field and aims at solving the problems of large same-frequency interference, high system cost and complex debug of the prior art in the process of the synchronous transmission of multi-channel broadcasting TV signals. The transmission method of the broadcasting TV signals, which is provided by the invention comprises the steps that: a base station receives transmission signals coming from a broadcasting TV transmission center and reduces the high-frequency carrier signals of the broadcasting TV containing multiple different channels; the base station carries out filtering frequency selection treatment to the broadcasting TV high-frequency carrier signals so as to separate the broadcasting TV high-frequency carrier signals of different channels; the base station transmits the separated broadcasting TV high-frequency carrier signals of different channels to a user terminal. The invention is used for realizing the frequency-division multiplexing synchronical transmission of the broadcasting TV signals, which can decrease the same-frequency interference of the crossing area of the broadcasting TV carrier signals and reduce system cost, thereby causing the system debug to be simpler.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of transmission method, system and device of broadcast television signal.
Background technology
In order to realize the emission of broadcast television signal multiple frequency synchronous, often need make each transmitting base station send the high-frequency carrier signal of identical frequency spectrum, and can carry out accurate time delay control, to reduce the co-channel interference between the adjacent base station to carrier signal.
As shown in Figure 1, broadcast television signal transmission center of the prior art (for example certain TV station) is sent the signal of each cover broadcast TV program into the corresponding digital coding unit, and the radio and television digital code stream after encoded is transferred to each base station through transmitting element.In each base station, the receiving element reduction obtains radio and television digital code stream signal, and send into modulating unit, modulating unit is modulated into radio and television digital code stream signal the high-frequency carrier signal of broadcast television signal, and, adopt global positioning system (GPS, global positioningsystem) clock signal is carried out the time delay adjustment to this high-frequency carrier signal, so that the time delay of the high frequency carrier that contains broadcast television signal that each base station goes out is synchronous, the adjusted high-frequency carrier signal that contains broadcast television signal of time delay is launched after power amplification.
This shows, in the multiple frequency synchronous emission system of existing broadcast television signal, the radio and television high-frequency carrier signal of each channel is by independently modulator generation of base station, promptly for the broadcast television signal of each channel, all need an independent modulators modulate to produce the radio and television high-frequency carrier signal of this channel, yet when the broadcast television signal multiple frequency synchronous was launched, the high frequency carrier frequency spectrum that produces in each modulator of each base station was not in full accord.
For example, in two transmitting base stations of A, B, when same digital broadcasting-television signal is modulated into the high-frequency carrier signal of same frequency, experienced a nonlinear process, the high frequency carrier frequency spectrum that two base stations of A, B produce not is in full accord, when the high-frequency carrier signal of A, B base station drops on a receiving terminal simultaneously, will form homogenous frequency signal and disturb.Therefore, two transmitting base stations of A, B are in order to ensure the carrier frequency unanimity of sending, adopted the high precision reference clock signal of GPS to carry out synchronously, the GPS reference clock signal locks local oscillation signal by phase-locked loop, the centre frequency of the high-frequency carrier signal that transmitting base station sends is constantly revised and reached stable, but, above process can not guarantee that the instantaneous frequency of the high-frequency carrier signal that two transmitting base stations of A, B are launched is identical, and small frequency error must cause quite serious co-channel interference.And, because prior art at same set of broadcast TV program, needs to be modulated at each inside of base station respectively the high-frequency carrier signal of same frequency, and carries out synchronous debugging by the GPS standard time clock, thereby cause the system equipment cost very high, the debugging complexity is also very high.
In sum, prior art is when synchronous transmission multichannel broadcast television signal, and co-channel interference is bigger, and system cost is higher, and debugging is complicated.
Summary of the invention
The embodiment of the invention provides a kind of transmission method, system and a kind of base station of broadcast television signal, in order to solve prior art when the synchronous transmission multichannel broadcast television signal, have that co-channel interference is big, system cost is higher, and the debugging complicated problems.
The launching technique of a kind of broadcast television signal that the embodiment of the invention provides comprises:
The base station receives the transmission signals from broadcast, and therefrom restores the radio and television high-frequency carrier signal that contains a plurality of different channels;
Filtering frequency-selecting processing is carried out to the described radio and television high-frequency carrier signal that receives in described base station, restores the radio and television high-frequency carrier signal of each channel;
User terminal is given with the radio and television high-frequency carrier signal synchronized transmissions of described each channel that restores in described base station.
The launching technique of a kind of broadcast television signal that the embodiment of the invention provides comprises:
Broadcast is modulated each group broadcast television signal respectively, obtains the radio and television high-frequency carrier signal of each channel;
Described broadcast is given the base station with the radio and television high-frequency carrier signal of described each channel by the transmission medium synchronized transmissions.
The transmission method of a kind of broadcast television signal that the embodiment of the invention provides comprises:
Broadcast is modulated each group broadcast television signal respectively, obtains the radio and television high-frequency carrier signal of each channel, and gives the base station with the radio and television high-frequency carrier signal of described each channel by the transmission medium synchronized transmissions;
Filtering frequency-selecting processing is carried out to described radio and television high-frequency carrier signal in described base station, restores the radio and television high-frequency carrier signal of each channel, and gives user terminal with the radio and television high-frequency carrier signal synchronized transmissions of described each channel that restores.
The transmission system of a kind of broadcast television signal that the embodiment of the invention provides comprises:
Broadcast is used for respectively each group broadcast television signal being modulated, and obtains the radio and television high-frequency carrier signal of each channel, and gives the base station with the radio and television high-frequency carrier signal of described each channel by the transmission medium synchronized transmissions;
The base station is used for that described radio and television high-frequency carrier signal is carried out the filtering frequency-selecting and handles, and restores the radio and television high-frequency carrier signal of each channel, and gives user terminal with the radio and television high-frequency carrier signal synchronized transmissions of described each channel that restores.
The emitter of a kind of broadcast television signal that the embodiment of the invention provides comprises:
Modulating unit is used for each group broadcast television signal is modulated, and obtains the radio and television high-frequency carrier signal of each channel;
Transmission unit is used for giving the base station with the radio and television high-frequency carrier signal of described each channel by the transmission medium synchronized transmissions.
A kind of base station that the embodiment of the invention provides comprises:
Transmission unit is used to receive the transmission signals from broadcast, and therefrom restores the radio and television high-frequency carrier signal that contains a plurality of different channels;
Filtering frequency-selecting unit is used for that described radio and television high-frequency carrier signal is carried out the filtering frequency-selecting and handles, and restores the radio and television high-frequency carrier signal of each channel;
Transmitter unit is used for giving user terminal with the radio and television high-frequency carrier signal synchronized transmissions of described each channel that restores.
The embodiment of the invention by the transmission signals of base station reception from broadcast, and therefrom restores the radio and television high-frequency carrier signal that contains a plurality of different channels; Filtering frequency-selecting processing is carried out to described radio and television high-frequency carrier signal in described base station, isolates the radio and television high-frequency carrier signal of each channel; User terminal is given with the radio and television high-frequency carrier signal synchronized transmissions of described isolated each channel in described base station.Because the spectrum component of the radio and television high-frequency carrier signal of the same channel that each base station reduction obtains is identical, particularly the transient behavior relative difference on frequency is zero, thereby avoided the problem that the frequency spectrum of the radio and television high-frequency carrier signal of the same channel of each base station there are differences in the prior art, the radio and television high-frequency carrier signal of the same channel of each base station of the present invention drops on same user terminal simultaneously, reduces to minimum thereby the homogenous frequency signal that produces disturbs; And, because the broadcast singal that comprises in the transmission signals that each base station receives is the radio and television high-frequency carrier signal that has modulated, therefore, saved each base station and the broadcast television signal of each channel has been modulated into the process of the radio and television high-frequency carrier signal of this channel, thereby system cost obviously reduces, and it is very simple that system debug becomes.
Description of drawings
Fig. 1 is the structural representation of the multiple frequency synchronous emission system of broadcast television signal in the prior art;
The structural representation of the transmission system of a kind of broadcast television signal that Fig. 2 provides for the embodiment of the invention;
The schematic flow sheet of the transmission method of a kind of broadcast television signal that Fig. 3 provides for the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of frequency division multiplexing synchronization transfer method, system and device of broadcast television signal, in order to reduce the co-channel interference of radio and television high-frequency carrier signal, reduces system cost, makes system debug simpler.
The described radio and television high-frequency carrier signal of the embodiment of the invention is the high-frequency carrier signal that comprises broadcast television signal.
Below in conjunction with accompanying drawing, the embodiment of the invention is specifically described.
Referring to Fig. 2, the transmission system of a kind of broadcast television signal that the embodiment of the invention provides comprises:
The described broadcast television signal of respectively organizing is each group vision signal, one group of vision signal correspondence a channel, for example, if there are 10 groups of vision signals to need to send, then need these 10 groups of vision signals are modulated into the radio and television high-frequency carrier signal of 10 channels, promptly respectively organize vision signal and adopt the high-frequency carrier signal of different frequency to send.
Described transmission medium can be a microwave, also can be optical fiber, therefore, broadcast 21 need be converted to microwave signal or light signal with the radio and television high-frequency carrier signal of first channel and second channel, is transmitted to each base station by microwave or optical fiber then.
The present invention is transmitted to each signal of base station (for example microwave signal or light signal) with broadcast and is called transmission signals, comprising the radio and television high-frequency carrier signal of a plurality of channels.
Base station 22, be used to receive transmission signals from broadcast 21, and therefrom reduction obtains containing the radio and television high-frequency carrier signal of each channel, and this radio and television high-frequency carrier signal is carried out the filtering frequency-selecting handle, isolate the radio and television high-frequency carrier signal of each channel, and give user terminal the radio and television high-frequency carrier signal synchronized transmissions of isolated each channel.
The embodiment of the invention is that example describes with the broadcast television signal that transmits two channels.
Preferably, described broadcast 21 comprises:
Modulating unit 211 is used for first group of digital broadcasting-television signal modulated, and obtains the radio and television high-frequency carrier signal of first channel.
Modulating unit 213 is used for second group of digital broadcasting-television signal modulated, and obtains the radio and television high-frequency carrier signal of second channel.
Need to prove that coding unit exists in order to generate digital broadcasting-television signal,, only need the transportation simulator broadcast television signal, then do not need coding unit if do not need to generate the array broadcast television signal.
Preferably, described base station comprises:
Time delay adjustment unit 221 is used for the radio and television high-frequency carrier signal that contains first channel and second channel that described transmission unit 220 reduction obtain is carried out time delay adjustment uniformly.
Filtering frequency-selecting unit 222 is used for the radio and television high-frequency carrier signal of described time delay adjustment unit 221 adjusted first channels and second channel is carried out filtering frequency-selecting processing, isolates the radio and television high-frequency carrier signal of first channel.
Amplifying unit 223 is used for the radio and television high-frequency carrier signal of described filtering frequency-selecting unit 222 isolated first channels is carried out the power amplification processing.
Filtering frequency-selecting unit 224 is used for that the described time delay adjustment unit 221 adjusted radio and television high-frequency carrier signals that contain first channel and second channel are carried out the filtering frequency-selecting and handles, and isolates the radio and television high-frequency carrier signal of second channel.
Amplifying unit 225 is used for the radio and television high-frequency carrier signal of described filtering frequency-selecting unit 224 isolated second channels is carried out the power amplification processing.
This shows, in the system that the embodiment of the invention provides, by the broadcast unification each group broadcast television signal is modulated into the radio and television high-frequency carrier signal of each channel, has avoided each base station each group broadcast television signal to be modulated into radio and television high-frequency carrier signal loaded down with trivial details of each channel; And, in each base station, radio and television high-frequency carrier signal to each channel carries out unified time delay adjustment, thereby avoid each base station in the prior art to the radio and television high-frequency carrier signal of each channel need carry out separately that time delay adjusts loaded down with trivial details and, also avoided the radio and television high-frequency carrier signal of each channel to carry out the error that the time delay adjustment is brought through different time delay adjustment units.Therefore, the system that the embodiment of the invention provides not only can reduce the co-channel interference of radio and television high-frequency carrier signal, but also can reduce system cost largely, makes system debug more quick.
Introduce the method that the embodiment of the invention provides below.
Referring to Fig. 3, the transmission method of a kind of broadcast television signal that the embodiment of the invention provides comprises:
S301, broadcast are carried out encoding process with each group broadcast television signal, are respectively organized digital broadcasting-television signal.
S302, broadcast are modulated each group digital broadcasting-television signal, obtain the radio and television high-frequency carrier signal of each channel.
S303, broadcast are given the base station with the radio and television high-frequency carrier signal of each channel by the transmission medium synchronized transmissions.
S304, base station receive the transmission signals from broadcast, and therefrom restore the radio and television high-frequency carrier signal that contains described each channel, and the described radio and television high-frequency carrier signal that contains each channel carried out the time delay adjustment, so that the time delay unanimity of the radio and television high-frequency carrier signal of the same channel of each base station in the system is avoided co-channel interference.
Filtering frequency-selecting processing will be carried out through the adjusted radio and television high-frequency carrier signal that contains each channel of time delay in S305, base station, isolate the radio and television high-frequency carrier signal of each channel.
S306, base station carry out the radio and television high-frequency carrier signal of isolated each channel to be transmitted to user terminal after power amplification is handled.
In sum, the embodiment of the invention obtains the radio and television high-frequency carrier signal of a plurality of channels that the broadcast unification modulates by the base station, filtering frequency-selecting processing is carried out to the radio and television high-frequency carrier signal of each channel in the base station, isolates the radio and television high-frequency carrier signal of each channel; User terminal is given with the radio and television high-frequency carrier signal synchronized transmissions of isolated each channel in the base station.Because the spectrum component of the radio and television high-frequency carrier signal of each channel that each base station obtains is identical, particularly the transient behavior relative difference on frequency is zero, thereby avoided the problem that the frequency spectrum of the radio and television high-frequency carrier signal of the same channel of each base station there are differences in the prior art, the radio and television high-frequency carrier signal of the same channel of each base station of the present invention drops on same user terminal simultaneously, reduces to minimum thereby the homogenous frequency signal that produces disturbs; And, because what each base station reduction obtained is the radio and television high-frequency carrier signal that has modulated, therefore, saved each base station and the broadcast television signal of each channel has been modulated into the process of radio and television high-frequency carrier signal, thereby system cost obviously reduces, and it is very simple that system debug becomes.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1, a kind of launching technique of broadcast television signal is characterized in that, this method comprises:
The base station receives the transmission signals from broadcast, and therefrom restores the radio and television high-frequency carrier signal that contains a plurality of different channels;
Filtering frequency-selecting processing is carried out to described radio and television high-frequency carrier signal in described base station, isolates the radio and television high-frequency carrier signal of each channel;
User terminal is given with the radio and television high-frequency carrier signal synchronized transmissions of described isolated each channel in described base station.
2, method according to claim 1 is characterized in that, filtering frequency-selecting processing was carried out in described base station to described radio and television high-frequency carrier signal before, this method also comprised:
The time delay adjustment is carried out to described radio and television high-frequency carrier signal in described base station;
Described base station is carried out filtering frequency-selecting processing to described radio and television high-frequency carrier signal and is meant: filtering frequency-selecting processing will be carried out through the adjusted radio and television high-frequency carrier signal of described time delay in described base station, restore the radio and television high-frequency carrier signal of each channel.
3, method according to claim 1 and 2 is characterized in that, described base station carries out the radio and television high-frequency carrier signal of described each channel to be transmitted to user terminal after power amplification is handled.
4, a kind of launching technique of broadcast television signal is characterized in that, this method comprises:
Broadcast is modulated each group broadcast television signal respectively, obtains the radio and television high-frequency carrier signal of each channel;
Described broadcast is given the base station with the radio and television high-frequency carrier signal of described each channel by the transmission medium synchronized transmissions.
5, method according to claim 4 is characterized in that, before described broadcast was modulated each group broadcast television signal respectively, this method also comprised:
Described broadcast is carried out encoding process to each group broadcast television signal respectively, is respectively organized digital broadcasting-television signal;
Described broadcast is modulated each group broadcast television signal respectively and is meant: described broadcast is modulated the described digital broadcasting-television signal of respectively organizing respectively.
6, a kind of transmission method of broadcast television signal is characterized in that, this method comprises:
Broadcast is modulated each group broadcast television signal respectively, obtains the radio and television high-frequency carrier signal of each channel, and gives the base station with the radio and television high-frequency carrier signal of described each channel by the transmission medium synchronized transmissions;
Filtering frequency-selecting processing is carried out to described radio and television high-frequency carrier signal in described base station, isolates the radio and television high-frequency carrier signal of each channel, and gives user terminal with the radio and television high-frequency carrier signal synchronized transmissions of described isolated each channel.
7, a kind of transmission system of broadcast television signal is characterized in that, this system comprises:
Broadcast is used for respectively each group broadcast television signal being modulated, and obtains the radio and television high-frequency carrier signal of each channel, and gives the base station with the radio and television high-frequency carrier signal of described each channel by the transmission medium synchronized transmissions;
The base station is used for that described radio and television high-frequency carrier signal is carried out the filtering frequency-selecting and handles, and isolates the radio and television high-frequency carrier signal of each channel, and gives user terminal with the radio and television high-frequency carrier signal synchronized transmissions of described isolated each channel.
8, a kind of emitter of broadcast television signal is characterized in that, this device comprises:
Modulating unit is used for each group broadcast television signal is modulated, and obtains the radio and television high-frequency carrier signal of each channel;
Transmission unit is used for giving the base station with the radio and television high-frequency carrier signal of described each channel by the transmission medium synchronized transmissions.
9, a kind of base station is characterized in that, this base station comprises:
Transmission unit is used to receive the transmission signals from broadcast, and therefrom restores the radio and television high-frequency carrier signal that contains a plurality of different channels;
Filtering frequency-selecting unit is used for that described radio and television high-frequency carrier signal is carried out the filtering frequency-selecting and handles, and isolates the radio and television high-frequency carrier signal of each channel;
Transmitter unit is used for giving user terminal with the radio and television high-frequency carrier signal synchronized transmissions of described isolated each channel.
10, base station according to claim 9 is characterized in that, this base station also comprises:
The time delay adjustment unit is used for the radio and television high-frequency carrier signal that contains a plurality of different channels that described transmission unit reduction obtains is unified the time delay adjustment;
Described filtering frequency-selecting unit carries out the filtering frequency-selecting to the radio and television high-frequency carrier signal after the described time delay adjustment unit processing and handles, and isolates the radio and television high-frequency carrier signal of each channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100997058A CN101287079B (en) | 2008-05-21 | 2008-05-21 | Transmission method, system and device for broadcast television signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100997058A CN101287079B (en) | 2008-05-21 | 2008-05-21 | Transmission method, system and device for broadcast television signal |
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| Publication Number | Publication Date |
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| CN101287079A true CN101287079A (en) | 2008-10-15 |
| CN101287079B CN101287079B (en) | 2010-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008100997058A Expired - Fee Related CN101287079B (en) | 2008-05-21 | 2008-05-21 | Transmission method, system and device for broadcast television signal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101500098B (en) * | 2009-02-13 | 2012-05-30 | 周颖平 | Transmission method and system for broadcast television signal |
| CN103901282A (en) * | 2014-03-25 | 2014-07-02 | 国家电网公司 | Method for testing high-voltage transmission line television interferences |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1141807C (en) * | 2000-03-15 | 2004-03-10 | 何根生 | Transmitting system of synchronous frequency-modulating broadcast network |
| CN100499414C (en) * | 2003-09-20 | 2009-06-10 | 安徽省广播电视科研所 | Precisely synchronous coverage system for FM broadcast |
| CN100508590C (en) * | 2006-04-14 | 2009-07-01 | 周颖平 | One-time modulation and co-frequency synchronization transfer method and system of audio and video signals |
-
2008
- 2008-05-21 CN CN2008100997058A patent/CN101287079B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101500098B (en) * | 2009-02-13 | 2012-05-30 | 周颖平 | Transmission method and system for broadcast television signal |
| CN103901282A (en) * | 2014-03-25 | 2014-07-02 | 国家电网公司 | Method for testing high-voltage transmission line television interferences |
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| Publication number | Publication date |
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| CN101287079B (en) | 2010-09-08 |
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