CN101394536A - Broadcast television signal transmitting method, system and device - Google Patents
Broadcast television signal transmitting method, system and device Download PDFInfo
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- CN101394536A CN101394536A CNA2008102248928A CN200810224892A CN101394536A CN 101394536 A CN101394536 A CN 101394536A CN A2008102248928 A CNA2008102248928 A CN A2008102248928A CN 200810224892 A CN200810224892 A CN 200810224892A CN 101394536 A CN101394536 A CN 101394536A
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000005540 biological transmission Effects 0.000 claims abstract description 52
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 230000001360 synchronised effect Effects 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 6
- 238000001228 spectrum Methods 0.000 description 5
- 239000013307 optical fiber Substances 0.000 description 4
- 239000000835 fiber Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000001934 delay Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Abstract
The invention discloses a transmitting method, a system and a device of radio and television signals, thereby reducing the noise of high frequency carrier waves which contain the radio and television signals and are transmitted by a base station and improving the covering effect of the radio and television signals. The transmitting method of the radio and television signals comprises: the base station converts the high frequency carrier waves which contain the radio and television signals and are transmitted by a radio and television transmission device to digital signals; the base station carries out the delay treatment of the digital signals; the base station converts the digital signals after the delay treatment to analog signals and transmits to a user terminal.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of launching technique, system and device of broadcast television signal.
Background technology
In order to realize that television broadcasting signal large tracts of land signal covers, prior art is general to adopt many base stations with frequency synchronized transmissions broadcast television signal, for the same frequency synchronous transmission that realizes broadcast television signal covers, the broadcast television signal that promptly makes each adjacent base station send is synchronous, often need control the time delay of the carrier signal that contains broadcast television signal of the emission of each base station, time of carrier signal of containing broadcast television signal with the emission of guaranteeing each base station is in full accord.
As shown in Figure 1, the transmission course of broadcast television signal of the prior art comprises:
Broadcast television transmissions equipment is transferred to each base station with broadcast television signal, and each base station obtains containing the high frequency carrier f0 of broadcast television signal, and f0 simulates time delay processing to high frequency carrier, launches after processing and amplifying again.
This shows, prior art is in the whole transmission course of broadcast television signal, what adopt all is analog signal processing technology, and analog signal processing technology can't be removed noise, therefore each base station adopts simulation time delay processing method that the high frequency carrier f0 that contains broadcast television signal is carried out time delay processing, the carrier-to-noise ratio deterioration that can cause the high frequency carrier that contains broadcast singal of base station, and increase along with distance between the base station and relay station quantity, the carrier noise coefficient that contains the high frequency carrier f0 of broadcast television signal can constantly increase, thereby influences the coverage effect of broadcast television signal.
In sum, the noise of the high frequency carrier that contains broadcast television signal of prior art base station is bigger, influences the coverage effect of broadcast television signal.
Summary of the invention
The embodiment of the invention provides a kind of launching technique, system and device of broadcast television signal, in order to the noise of the high frequency carrier that contains broadcast television signal that reduces base station, improves the coverage effect of broadcast television signal.
The launching technique of a kind of broadcast television signal that the embodiment of the invention provides comprises:
The base station converts the high frequency carrier that contains broadcast television signal that broadcast television transmissions equipment sends to digital signal;
Delay process is carried out to described digital signal in described base station;
Described base station will be transmitted to user terminal after will being converted to analog signal through the digital signal after the described delay process.
A kind of base station that the embodiment of the invention provides comprises:
AD conversion unit is used for converting the high frequency carrier that contains broadcast television signal that broadcast television transmissions equipment sends to digital signal;
Digital processing element is used for described digital signal is carried out delay process;
D/A conversion unit is used for and will be converted to analog signal through the digital signal after the described delay process;
Transmitter unit is used for the analog signal after handling through described D/A conversion unit is transmitted to user terminal.
A kind of communication system that the embodiment of the invention provides comprises: broadcast television transmissions equipment and at least one base station;
Described broadcast television transmissions equipment is used for broadcast television signal is carried out modulation treatment, generates the high frequency carrier that contains this broadcast television signal, and this high frequency carrier is sent to the base station;
Described base station is used for converting described high frequency carrier to digital signal; Described digital signal is carried out delay process; Be transmitted to user terminal after will being converted to analog signal through the digital signal after the described delay process.
The embodiment of the invention converts the high frequency carrier that contains broadcast television signal that broadcast television transmissions equipment sends to digital signal by the base station; Delay process is carried out to described digital signal in described base station; Described base station will be transmitted to user terminal after will being converted to analog signal through the digital signal after the described delay process, thereby make the broadcast television transmissions device transmission be able to filtering for the noise in the high frequency carrier that contains broadcast television signal of base station, and having avoided prior art that the high frequency carrier that contains broadcast singal is carried out the noise that the time delay adjustment caused adds up, thereby improved the signal launch mass, and make that the adjustable extent of time delay is bigger, precision is higher, and system debug is simple more, convenient.
Description of drawings
Fig. 1 is the transmission course schematic diagram of broadcast television signal of the prior art;
The structural representation of the communication system of a kind of broadcast television signal that Fig. 2 provides for the embodiment of the invention;
The structural representation of a kind of broadcast television transmissions equipment that Fig. 3 provides for the embodiment of the invention;
The structural representation of a kind of base station that Fig. 4 provides for the embodiment of the invention;
The emission process schematic diagram of a kind of broadcast television signal that Fig. 5 provides for the embodiment of the invention;
The schematic flow sheet of the launching technique of a kind of broadcast television signal that Fig. 6 provides for the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of launching technique, system and device of broadcast television signal, in order to the noise of the high frequency carrier that contains broadcast television signal that reduces base station, improves the coverage effect of broadcast television signal.
Referring to Fig. 2, the communication system of a kind of broadcast television signal that the embodiment of the invention provides comprises: broadcast television transmissions equipment 21 and a plurality of base station 22.
Broadcast television transmissions equipment 21 is used for broadcast television signal is carried out modulation treatment, generates the high frequency carrier that contains this broadcast television signal, and this high frequency carrier is sent to base station 22.
Preferably, referring to Fig. 3, described broadcast television transmissions equipment 21 comprises:
Modulating unit 211 is used for broadcast television signal is carried out modulation treatment, generates the high frequency carrier that contains this broadcast television signal.
Preferably, referring to Fig. 4, described base station 22 comprises:
AD conversion unit 221 is used to adopt analog-to-digital conversion (A/D conversion) technology, and the high frequency carrier that contains broadcast television signal that broadcast television transmissions equipment 21 is sent converts digital signal to.
Digital processing element 222, be used for transferring to the path delay of time that described base station 22 is produced from broadcast television transmissions equipment 21 according to high frequency carrier, and predefined synchronized transmissions time delay, the digital signal that contains broadcast television signal that AD conversion unit 221 obtains is carried out delay process such as signal regeneration, synchronization delayed time equilibrium.
Wherein, the value in the described path delay of time can set in advance in base station 22, by global positioning system (GPS, global positioning system) records Actual path (as optical fiber) distance between broadcast television transmissions equipment 21 and the base station 22, the transmission time of per 1 km (km) optical fiber is that 5 microseconds (us) are calculated, thereby determine that according to path distance broadcast television signal is transferred to 22 needed time, the i.e. path delays of time of base station from broadcast television transmissions equipment 21.
Described synchronized transmissions time delay, promptly when requiring a plurality of base station synchronization to launch broadcast television signal, broadcast television signal from the broadcast television transmissions device transmission to each base station, and the time delay processing of each base station of process is launched, in this course, broadcast television signal emits by base station from broadcast television transmissions equipment and goes out the needed time.Owing to require each base station synchronization emission broadcast television signal, so claim that this time is the synchronized transmissions time delay.
D/A conversion unit 223 is used to adopt digital-to-analogue conversion (D/A conversion) technology, will be converted to analog signal through the digital signal after the delay process.
Transmitter unit 224 is used for the analog signal after handling through described D/A conversion unit 223 is transmitted to user terminal.
For example, referring to Fig. 5, the radio and television baseband signal produces high frequency carrier f0 through modulation, launch this high frequency carrier f0 to the base station 51, base station 52 and base station 53.By transmission time of per 1 km (km) optical fiber is that 5 microseconds (us) are calculated, and 51 fiber lengths is 31km from the optical sender to the base station, and then to be transferred to the path delay of time of base station 51 in this optical fiber be 155us to high frequency carrier f0; 52 fiber lengths is 74.5km from the optical sender to the base station, and be 372.5us the then corresponding path delay of time; 53 fiber lengths is 123.2km from the optical sender to the base station, and be 616us the then corresponding path delay of time.The synchronized transmissions time delay of setting each base station is 5000us, then base station 51 need be with high frequency carrier f0 time-delay 4845us, base station 52 need be with high frequency carrier f0 time-delay 4627.5us, base station 53 need be with high frequency carrier f0 time-delay 4384us, thereby make that the frequency spectrum of the high frequency carrier that contains broadcast television signal that these three base station go out is identical, and emission time delay precise synchronization.
In addition, because in the prior art is in each base station broadcast television signal to be modulated into high frequency carrier, when being modulated into high frequency carrier, experienced a nonlinear process, therefore, each base station is not in full accord through the high frequency carrier frequency spectrum that modulation produces, and when the high frequency carrier that is modulated in each base station drops on a receiving terminal simultaneously, will form homogenous frequency signal and disturb.
And the broadcast television signal in the embodiment of the invention is modulated into high frequency carrier by broadcast television transmissions equipment 21, be transferred to each base station through opto-electronic conversion, the high frequency carrier relative error of the frequency that each base station is sent is zero, and further handle and accurately to control each base station synchronization emission broadcast television signal by the digital delay of each base station, thereby reduced the co-channel interference between the broadcast television signal of each base station, and, can reduce the system equipment cost, make debugging simpler.
Introduce the method that the embodiment of the invention provides below.
As shown in Figure 6, the launching technique of a kind of broadcast television signal of providing of the embodiment of the invention comprises step:
S601, base station convert the high frequency carrier that contains broadcast television signal that broadcast television transmissions equipment sends to digital signal.
Delay process is carried out to the digital signal that contains broadcast television signal in S602, base station.
S603, base station will be transmitted to user terminal after will being converted to analog signal through the digital signal that contains broadcast television signal after the delay process.
In sum, the embodiment of the invention converts the high frequency carrier that contains broadcast television signal that broadcast television transmissions equipment sends to digital signal by the base station, this digital signal is carried out delay process, and be transmitted to user terminal after will being converted to analog signal through the digital signal after this delay process, thereby make the broadcast television transmissions device transmission be able to filtering for the noise in the high frequency carrier that contains broadcast television signal of base station, and having avoided prior art that the high frequency carrier that contains broadcast singal is carried out the noise that the time delay adjustment caused adds up, thereby improved the signal launch mass, and make that the adjustable extent of time delay is bigger, precision is higher, and system debug is simpler, convenient.
In addition, broadcast television transmissions equipment in the embodiment of the invention is transmitted to each base station after broadcast television signal is modulated into high frequency carrier, obtain the modulated high frequency carrier that contains broadcast television signal in each base station, thereby any variation does not take place in the feasible frequency that contains the high frequency carrier of broadcast television signal, the relative error of the frequency of the high frequency carrier that contains broadcast television signal of each base station is zero, its frequency spectrum is identical, avoided each base station separately broadcast television signal to be modulated into the frequency spectrum difference that high frequency carrier causes, when thereby the high frequency carrier that contains broadcast television signal that makes each base station dropped on a user terminal simultaneously, the homogenous frequency signal of generation disturbs reduced to minimum; And because each base station receives the modulated high frequency carrier of same frequency spectrum, therefore, it is very simple that system debug becomes, and equipment cost obviously reduces.
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 converts the high frequency carrier that contains broadcast television signal that broadcast television transmissions equipment sends to digital signal;
Delay process is carried out to described digital signal in described base station;
Described base station will be transmitted to user terminal after will being converted to analog signal through the digital signal after the described delay process.
2, method according to claim 1, it is characterized in that, from described broadcast television transmissions device transmission to path delay of time that described base station produced, and predefined synchronized transmissions time delay is carried out delay process to described digital signal according to described high frequency carrier in described base station.
3, method according to claim 1 and 2 is characterized in that, described base station will carry out being transmitted to user terminal after the processing and amplifying to this analog signal after will being converted to analog signal through the digital signal after the described delay process.
4, method according to claim 1 is characterized in that, described base station receives described high frequency carrier by microwave or light wave.
5, a kind of base station is characterized in that, this base station comprises:
AD conversion unit is used for converting the high frequency carrier that contains broadcast television signal that broadcast television transmissions equipment sends to digital signal;
Digital processing element is used for described digital signal is carried out delay process;
D/A conversion unit is used for and will be converted to analog signal through the digital signal after the described delay process;
Transmitter unit is used for the analog signal after handling through described D/A conversion unit is transmitted to user terminal.
6, base station according to claim 5, it is characterized in that, described digital processing element, according to described high frequency carrier from described broadcast television transmissions device transmission to path delay of time that described base station produced, and predefined synchronized transmissions time delay, described digital signal is carried out delay process.
7, base station according to claim 6 is characterized in that, described transmitter unit carries out being transmitted to user terminal after the processing and amplifying to the analog signal after handling through described D/A conversion unit.
8, a kind of communication system is characterized in that, this system comprises: broadcast television transmissions equipment and at least one base station;
Described broadcast television transmissions equipment is used for broadcast television signal is carried out modulation treatment, generates the high frequency carrier that contains this broadcast television signal, and this high frequency carrier is sent to the base station;
Described base station is used for converting described high frequency carrier to digital signal; Described digital signal is carried out delay process; Be transmitted to user terminal after will being converted to analog signal through the digital signal after the described delay process.
9, system according to claim 8 is characterized in that, described base station comprises:
AD conversion unit is used for converting the high frequency carrier that contains broadcast television signal that broadcast television transmissions equipment sends to digital signal;
Digital processing element is used for according to described high frequency carrier from described broadcast television transmissions device transmission to path delay of time that described base station produced, and predefined synchronized transmissions time delay, and described digital signal is carried out delay process;
D/A conversion unit is used for and will be converted to analog signal through the digital signal after the described delay process;
Transmitter unit is used for the analog signal after handling through described D/A conversion unit is transmitted to user terminal.
10, according to Claim 8 or 9 described systems, it is characterized in that described broadcast television transmissions equipment comprises:
Modulating unit is used for broadcast television signal is carried out modulation treatment, generates the high frequency carrier that contains this broadcast television signal;
Transmitter unit is used for described high frequency carrier is sent to described base station by microwave or light wave.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102248928A CN101394536A (en) | 2008-10-24 | 2008-10-24 | Broadcast television signal transmitting method, system and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102248928A CN101394536A (en) | 2008-10-24 | 2008-10-24 | Broadcast television signal transmitting method, system and device |
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| Publication Number | Publication Date |
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| CN101394536A true CN101394536A (en) | 2009-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008102248928A Pending CN101394536A (en) | 2008-10-24 | 2008-10-24 | Broadcast television signal transmitting method, system and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217964A (en) * | 2018-09-10 | 2019-01-15 | 北京崇信众城科技有限公司 | A kind of synchronized broadcast method of modulated wave Digital Transmission |
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2008
- 2008-10-24 CN CNA2008102248928A patent/CN101394536A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217964A (en) * | 2018-09-10 | 2019-01-15 | 北京崇信众城科技有限公司 | A kind of synchronized broadcast method of modulated wave Digital Transmission |
| CN109217964B (en) * | 2018-09-10 | 2023-10-27 | 北京崇信众城科技有限公司 | Synchronous broadcasting method for digital transmission of modulated waves |
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Application publication date: 20090325 |