CN101500098B - Transmission method and system for broadcast television signal - Google Patents
Transmission method and system for broadcast television signal Download PDFInfo
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- CN101500098B CN101500098B CN2009100069472A CN200910006947A CN101500098B CN 101500098 B CN101500098 B CN 101500098B CN 2009100069472 A CN2009100069472 A CN 2009100069472A CN 200910006947 A CN200910006947 A CN 200910006947A CN 101500098 B CN101500098 B CN 101500098B
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Abstract
The invention discloses a broadcast television signal emission method and a system, which are used for simplifying the overlay network of multi-system broadcast television signals and reducing the system cost. The broadcast television signal emission method comprises the steps: broadcast television transmission central equipment generates standard synchronous carrier signals and adopts multiple modulation modes to modulate broadcast television baseband signals, thus generating a group of radio-frequency signals containing a plurality of channels; the broadcast television transmission central equipment transmits the radio-frequency signals and the standard synchronous carrier signals to a base station through radio-frequency transmission channels; and the base station uses the standard synchronous carrier signals for carrying out radio-frequency synchronous delayed time processing to the radio-frequency signals of a plurality of channels and then emitting the radio-frequency signals to a user terminal.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of launching technique and system of broadcast television signal.
Background technology
The TV signal receiving terminal has a variety of at present; For example simulated television, hand-set digit TV, mobile digital TV, fixing digital TV in high resolution etc.; The modulation standard that broadcast television signal adopted that these TV signal receiving terminals receive is different; Therefore, terrestrial wireless TV signal system need be set up corresponding with frequently synchronous TV signal overlay network according to different modulation standards carrying out pilosity when penetrating the base station with synchronous network frequently.That is to say, to the networking model of different modulating standard, must set up the transmission channel that adapts to its synchronous requirement, and transmission signals is carried out corresponding synchronous adaptation delay process.
As shown in Figure 1; Provided the transmission group net structure of the broadcast television signal under four kinds of modulation standards (being simulated television, hand-set digit TV, mobile digital TV, digital TV in high resolution); These four kinds of modulation standards are channel of correspondence respectively, and is transmitted to the relative users terminal through two transmitting base stations (being transmitting base station A and transmitting base station B).As can beappreciated from fig. 1; What anolog TV signals and digital TV in high resolution signal adopted is the radio frequency transmission technology; The television transmission center is modulated into the modulated wave radiofrequency signal with the baseband signal of anolog TV signals and digital TV in high resolution signal; Send to base station A and base station B through microwave transmission network respectively, and handle through delay equalization respectively and power amplification processing back entering power combiner.What hand-set digit TV signal and mobile digital TV signals adopted is the baseband signal transmission method; The digital baseband signal that obtains after sync adapters is handled is passed through with hand-set digit TV signal and mobile digital TV signals in the television transmission center; Be sent to base station A and base station B through optical fiber transmission network respectively; Digital baseband signal is being launched after synthetic and antenna-feedback system is handled through synchronization delayed time processing, power amplification, power under the control of global positioning system (GPS, Global Positioning System) clock signal.
This shows; Prior art is to set up corresponding broadcast television signal synchronous transmission network respectively according to the different modulation standard of broadcast television signal; The link transmission equipment of each channel broadcasting TV signal, gps clock source, sync adapters, modulator driver etc. all are self-existent to the broadcast television signal of different modulating standard respectively; Therefore; Prior art exists external clock equipment such as the transmission channel resource occupation is too much, system synchronization must rely on GPS, networking debugging complicacy, equipment cost than problems such as height when setting up the synchronous overlay network of the multiple modulation system of multichannel.
Summary of the invention
The embodiment of the invention provides a kind of launching technique and system of broadcast television signal, in order to simplify the overlay network of multi-modulation scheme broadcast television signal, reduces system cost.
The launching technique of a kind of broadcast television signal that the embodiment of the invention provides comprises:
Broadcast equipment generates standard synchronous carrier signals, and adopts multiple modulation system that the radio and television baseband signal is modulated, and generates one group of radiofrequency signal that comprises a plurality of channels;
Said broadcast equipment is transferred to the base station with said radiofrequency signal and said standard synchronous carrier signals through radio-frequency transmission channels;
Said base station utilizes said standard synchronous carrier signals that the radiofrequency signal of said a plurality of channels is carried out being transmitted to user terminal after the radio frequency synchronizing relay is handled;
Said base station utilizes said standard synchronous carrier signals that the radiofrequency signal of said a plurality of channels is carried out being transmitted to user terminal after the radio frequency synchronizing relay is handled;
Said base station utilizes said standard synchronous carrier signals that the radiofrequency signal of said a plurality of channels is carried out the radio frequency synchronizing relay and handles, and comprising:
Said base station utilizes the corresponding local frequency signal of frequency of said standard synchronous carrier signals generation and each channel, and clock sync signal;
Said base station utilizes the corresponding local frequency signal of frequency with each channel, and the radiofrequency signal of this channel is carried out down-converted, obtains the intermediate-freuqncy signal of each channel;
Analog-to-digital conversion is carried out with the intermediate-freuqncy signal of each channel in said base station, obtains the digital signal of each channel;
Said base station utilizes said clock sync signal that the digital signal of said each channel is carried out stored digital and handles, then through obtaining the intermediate-freuqncy signal of each channel after the digital-to-analogue conversion;
Said base station utilizes the corresponding local frequency signal of frequency with each channel, carries out upconversion process to said through the intermediate-freuqncy signal that obtains each channel after the digital-to-analogue conversion.
The emission system of a kind of broadcast television signal that the embodiment of the invention provides comprises:
Broadcast equipment is used to generate standard synchronous carrier signals, and adopts multiple modulation system that the radio and television baseband signal is modulated, and generates one group of radiofrequency signal that comprises a plurality of channels; Said radiofrequency signal and said standard synchronous carrier signals are transferred to the base station through radio-frequency transmission channels;
Said base station is used to utilize said standard synchronous carrier signals, and the radiofrequency signal of said a plurality of channels is carried out being transmitted to user terminal after the radio frequency synchronizing relay is handled; Said base station utilizes said standard synchronous carrier signals that the radiofrequency signal of said a plurality of channels is carried out the radio frequency synchronizing relay and handles; Comprise: said base station utilizes the corresponding local frequency signal of frequency of said standard synchronous carrier signals generation and each channel, and clock sync signal; Said base station utilizes the corresponding local frequency signal of frequency with each channel, and the radiofrequency signal of this channel is carried out down-converted, obtains the intermediate-freuqncy signal of each channel; Analog-to-digital conversion is carried out with the intermediate-freuqncy signal of each channel in said base station, obtains the digital signal of each channel; Said base station utilizes said clock sync signal that the digital signal of said each channel is carried out stored digital and handles, then through obtaining the intermediate-freuqncy signal of each channel after the digital-to-analogue conversion; Said base station utilizes the corresponding local frequency signal of frequency with each channel, carries out upconversion process to said through the intermediate-freuqncy signal that obtains each channel after the digital-to-analogue conversion.
The embodiment of the invention, broadcast equipment generates standard synchronous carrier signals, and adopts multiple modulation system that the radio and television baseband signal is modulated, and generates one group of radiofrequency signal that comprises a plurality of channels; Said broadcast equipment is transferred to the base station with said radiofrequency signal and said standard synchronous carrier signals through radio-frequency transmission channels; Said base station utilizes said standard synchronous carrier signals that the radiofrequency signal of said a plurality of channels is carried out being transmitted to user terminal after the radio frequency synchronizing relay is handled; Thereby realized same frequency synchronized transmissions to the radio and television radiofrequency signal of utilizing multiple modulation system modulation; Reduce the taking of networking resource of multi-modulation scheme broadcast television signal, simplified the overlay network of multi-modulation scheme broadcast television signal, reduced system cost; Improved the coverage effect of broadcast television signal; Through standard synchronous carrier signals the radiofrequency signal of a plurality of channels is carried out the radio frequency synchronizing relay and handle, improved the launch mass of broadcast television signal, 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 that the terrestrial wireless TV covers the networking sketch map in the prior art;
The general structure sketch map of the emission 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 radio frequency synchronous processing unit that Fig. 3 provides for the embodiment of the invention;
The structural representation of a kind of radio frequency synchronous processing unit that Fig. 4 provides for the embodiment of the invention;
The concrete structure sketch map of the emission system 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 transmission method and system of broadcast television signal, simplifies the overlay network of multi-modulation scheme broadcast television signal, reduces system cost, and improves the coverage effect of broadcast television signal.
In the embodiment of the invention; Broadcast equipment is with the radiofrequency signal of each channel broadcasting TV signal of modulator (modulator that comprises standards such as anolog TV signals, the digital television signal) generation of multiple standards; And standard synchronous carrier signals; Be sent to each base station through radio-frequency transmission channels (for example optical fiber or microwave etc.); Fully transparent radio frequency Synchronous Processing is carried out to each channel radiofrequency signal in each base station under the control of standard synchronous carrier signals, the radiofrequency signal after the Synchronous Processing through each channel power amplify, power is synthetic, antenna-feedback system sends to the user terminal of different modulating standard (standards such as simulation, numeral), thereby multiple modulation system, the multichannel common transmitted passage of having realized the terrestrial broadcast television signal carry out with synchronous network covering frequently; Reduced the resource occupation of transmission channel; And system synchronization no longer relies on external clocks such as GPS, so the system equipment cost reduces greatly, and the networking debugging is easy.
Below in conjunction with accompanying drawing the technical scheme that the embodiment of the invention provides is described.
Referring to Fig. 2, the emission system of a kind of broadcast television signal that the embodiment of the invention provides comprises: broadcast equipment 11 and a plurality of base stations 12.
Said base station 12 is used to utilize standard synchronous carrier signals, and the radiofrequency signal of a plurality of channels is carried out being transmitted to user terminal after the radio frequency synchronizing relay is handled.
Preferably, said broadcast equipment 11 comprises:
Modulating unit 111 is used to adopt multiple modulation system that the radio and television baseband signal is modulated, and generates the radiofrequency signal of a plurality of channel broadcasting TV signals.
Benchmark sync carrier generation unit 112 is used to generate standard synchronous carrier signals.
Said benchmark sync carrier generation unit 112 can be the frequency oscillator that not influenced by temperature etc. of high stability.Said standard synchronous carrier signals; It is single frequency signal by the frequency oscillator generation of high stability; For example: if the frequency range of the signal that radio-frequency transmission channels can be transmitted is 500 megahertz to 550 megahertzes, then standard synchronous carrier signals can be frequency signal of 500 megahertzes etc.But the frequency of the radiofrequency signal of each channel that the frequency of this standard synchronous carrier signals and modulating unit 111 generates is different, i.e. interfere radiofrequency signal not.The radiofrequency signal of each channel of intrasystem all base station all produces under same standard synchronous carrier signals control, makes that the frequency spectrum of the co-channel radiofrequency signal that send each base station is identical, and emission time delay precise synchronization.
Radio signal transmission unit 113 is used for standard synchronous carrier signals is transferred to base station 12 through radio-frequency transmission channels together with the radiofrequency signal that said modulating unit 111 adopts multiple modulation system modulation to obtain.
Preferably, said base station 12 comprises:
Radio signal transmission unit 121 is used for receiving the signal that broadcast equipment 11 sends through radio-frequency transmission channels.
Preferably, filter processing unit 122 can be channel divider or radio frequency splitter.
Radio frequency synchronous processing unit 123 is used to utilize standard synchronous carrier signals respectively the radiofrequency signal of each channel broadcasting TV signal to be carried out transparent, undistorted radio frequency synchronizing relay and handles, and does not change the frequency and the phase place of radiofrequency signal.
Preferably, referring to Fig. 3, said radio frequency synchronous processing unit 123 comprises:
Synchronizing frequency synthesis unit 20 is used to utilize standard synchronous carrier signals to generate and the corresponding local frequency signal of frequency of each channel, and clock sync signal.
Frequency conversion processing unit 21; Be used to utilize and the corresponding local frequency signal of the frequency of each channel; Radiofrequency signal to this channel broadcasting TV signal is carried out down-converted, and the frequency that is about to signal reduces, and obtains the intermediate-freuqncy signal of each channel broadcasting TV signal.
Stored digital processing unit 23 is used to utilize clock sync signal that the digital signal of each channel broadcasting TV signal is carried out stored digital and handles (DSP), thereby plays the effect of time-delay.
D/A conversion unit 24 is used for the signal after handling through stored digital processing unit 23 is carried out digital-to-analogue conversion (DDC), obtains the analog signal of each channel broadcasting TV signal.
Utilizing the local frequency signal is in order to practice thrift cost with the purpose that radiofrequency signal converts intermediate-freuqncy signal into, because the frequency of signal is low more, the cost of needed AD conversion unit 22, stored digital processing unit 23 and D/A conversion unit 24 is low more.
Therefore, referring to Fig. 4, said radio frequency synchronous processing unit 123 can also only comprise:
AD conversion unit 31 is used for the radiofrequency signal of each channel broadcasting TV signal is carried out analog-to-digital conversion, obtains the digital signal of each channel broadcasting TV signal.
Stored digital processing unit 32 is used to utilize standard synchronous carrier signals that the digital signal of each channel broadcasting TV signal is carried out stored digital and handles.
D/A conversion unit 33, being used for the conversion of signals after handling through stored digital processing unit 32 is analog signal, obtains the radiofrequency signal of each channel broadcasting TV signal.
Preferably, said radio-frequency transmission channels is optical-fibre channel or microwave channel.
Said radio signal transmission unit 113 is radio frequency optical transceiver, microwave machine or satellite-transmission gear with radio signal transmission unit 121.
Stored digital processing unit 23 or stored digital processing unit 32; Radiofrequency signal according to broadcast television signal transfers to the path delay of time that base station 12 is produced from broadcast equipment 11; And clock sync signal, the digital signal that contains broadcast television signal that AD conversion unit is obtained is carried out delay process such as signal regeneration, synchronization delayed time equilibrium.
For example, the radiofrequency signal that needs the emission broadcast television signal to first base station, second base station and the 3rd base station.By transmission time of per 1 km optical fiber is that 5 microseconds are calculated, and the radio frequency optical transceiver from broadcast equipment is 31km to the fiber lengths of first base station, and then in this optical fiber, to be transferred to the path delay of time of first base station be 155us to radiofrequency signal; Radio frequency optical transceiver from broadcast equipment is 74.5km to the fiber lengths of second base station, and be 372.5us the then corresponding path delay of time; The fiber lengths of radio frequency optical transceiver to the three base stations from broadcast equipment is 123.2km, and be 616us the then corresponding path delay of time.The clock sync signal of supposing each base station is 5000us; Then first base station need be with the radiofrequency signal 4845us that delays time; Second base station need be with the radiofrequency signal 4627.5us that delays time; The 3rd base station need be with the radiofrequency signal 4384us that delays time, thereby makes 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.
Launch after the processing of synthetic through power amplification, power respectively in the base station 12, antenna-feedback system through the radiofrequency signal after the delay process.
Referring to Fig. 5, adopting the same frequency synchronous network system of the resulting broadcast television signal of different modulation modes with these four kinds of analog television broadcast signal, hand-set digit TV signal, mobile digital TV signals and digital TV in high resolution signals is that example describes.
The channel of supposing these four kinds of broadcast television signals is respectively CH20, CH22, CH24 and CH26; Then in broadcast equipment; Adopt the different modulation modes modulation to obtain analog television broadcast signal, hand-set digit TV signal, mobile digital TV signals and digital TV in high resolution signal respectively, produce the radiofrequency signal of the broadcast television signal of these four channels; And, utilize benchmark sync carrier generation unit to generate standard synchronous carrier signals.Utilize the radio frequency mixer then, with the radiofrequency signal of CH20, CH22, CH24 and CH26, and standard synchronous carrier signals closes the road and handles, and closes signal behind the road through same transport vehicle, is sent to each transmitting base station like optical transceiver or microwave machine.
In each base station; Through corresponding transport vehicle; Receive the broadcast television signal that broadcast equipment sends like optical transceiver or microwave machine, and extract standard synchronous carrier signals through the radio frequency splitter, and the radiofrequency signal of CH20, CH22, CH24 and CH26.In each base station; The corresponding time delay processing device of one cover can all be set to the radiofrequency signal of each channel; The radiofrequency signal that is CH20, CH22, CH24 and CH26 comprises synchronous frequency synthesizer, low-converter, high-speed AD converter, stored digital processor, high-speed A/D converter, upconverter respectively to radio frequency synchronous processing device separately should be arranged in each radio frequency synchronous processing device.
For example: the frequency of supposing the radiofrequency signal of the CH20 that the radio frequency splitter extracts is 530MHz; The frequency of the local frequency signal that the synchronous frequency synthesizer that CH20 is corresponding generates is 520MHz, and then low-converter converts the radiofrequency signal of 530MHz into the intermediate-freuqncy signal of 10MHz.The frequency of supposing the radiofrequency signal of the CH22 that the radio frequency splitter extracts is 546MHz, and the frequency of the local frequency signal that the synchronous frequency synthesizer that CH22 is corresponding generates is 536MHz, and then low-converter converts the radiofrequency signal of 546MHz into the intermediate-freuqncy signal of 10MHz.
Utilize the frequency of the intermediate-freuqncy signal that the radiofrequency signal of each channel produces can be identical, also can be different.
Referring to Fig. 6, the launching technique of a kind of broadcast television signal that the embodiment of the invention provides comprises step:
S101, broadcast equipment generate standard synchronous carrier signals, and adopt multiple modulation system that the radio and television baseband signal is modulated, and generate one group of radiofrequency signal that comprises a plurality of channels.
S102, broadcast equipment are transferred to the base station with the radiofrequency signal and the said standard synchronous carrier signals of a plurality of channel broadcasting TV signals through radio-frequency transmission channels;
S103, base station utilize standard synchronous carrier signals that the radiofrequency signal of a plurality of channels is carried out being transmitted to user terminal after the radio frequency synchronizing relay is handled.
Preferably, step S103 comprises:
Filtering Processing is carried out to the signal that receives through radio-frequency transmission channels in step 1, base station, obtains the radiofrequency signal of a plurality of channel broadcasting TV signals, and standard synchronous carrier signals;
Step 2, base station utilize standard synchronous carrier signals respectively the radiofrequency signal of each channel broadcasting TV signal to be carried out the radio frequency synchronizing relay and handle;
The broadcast television signal that each channel after the radio frequency synchronizing relay is handled will be passed through in step 3, base station is transmitted to various user terminals.
Preferably, said step 2 comprises: analog-to-digital conversion is carried out with the radiofrequency signal of each channel broadcasting TV signal in the base station, obtains the digital signal of each channel broadcasting TV signal; The base station utilizes standard synchronous carrier signals that the digital signal of each channel broadcasting TV signal is carried out stored digital and handles, then through obtaining the radiofrequency signal of each channel broadcasting TV signal after the digital-to-analogue conversion.
Preferably, said step 2 comprises: the base station utilizes the corresponding local frequency signal of frequency of standard synchronous carrier signals generation and each channel, and clock sync signal; The base station utilizes the corresponding local frequency signal of frequency with each channel, and the radiofrequency signal of this channel broadcasting TV signal is carried out down-converted, obtains the intermediate-freuqncy signal of each channel broadcasting TV signal; Analog-to-digital conversion is carried out with the intermediate-freuqncy signal of each channel broadcasting TV signal in the base station, obtains the digital signal of each channel broadcasting TV signal; The base station utilizes clock sync signal that the digital signal of each channel broadcasting TV signal is carried out stored digital and handles, then through obtaining the intermediate-freuqncy signal of each channel broadcasting TV signal after the digital-to-analogue conversion; The base station utilizes the corresponding local frequency signal of frequency with each channel, and the intermediate-freuqncy signal of each channel broadcasting TV signal is carried out upconversion process.
In sum, the broadcast equipment in the embodiment of the invention adopts multiple modulation system that the radio and television baseband signal is modulated, and generates one group of radiofrequency signal that comprises a plurality of channels, and, generate standard synchronous carrier signals; Said broadcast equipment is transferred to the base station with said radiofrequency signal and said standard synchronous carrier signals through radio-frequency transmission channels; Said base station utilizes said standard synchronous carrier signals that the radiofrequency signal of said a plurality of channels is carried out being transmitted to user terminal after the radio frequency synchronizing relay is handled; Thereby realized same frequency synchronized transmissions to the radio and television radiofrequency signal of utilizing multiple modulation system modulation; Reduce the taking of networking resource of multi-modulation scheme broadcast television signal, simplified the overlay network of multi-modulation scheme broadcast television signal, reduced system cost; Improved the coverage effect of broadcast television signal; Through standard synchronous carrier signals the radiofrequency signal of a plurality of channels is carried out the radio frequency synchronizing relay and handle, improved the launch mass of broadcast television signal, make that the adjustable extent of time delay is bigger; Precision is higher, and system debug is simple more, convenient.
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, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (9)
1. the launching technique of a broadcast television signal is characterized in that, this method comprises:
Broadcast equipment generates standard synchronous carrier signals, and adopts multiple modulation system that the radio and television baseband signal is modulated, and generates one group of radiofrequency signal that comprises a plurality of channels;
Said broadcast equipment is transferred to the base station with said radiofrequency signal and said standard synchronous carrier signals through radio-frequency transmission channels;
Said base station utilizes said standard synchronous carrier signals that the radiofrequency signal of said a plurality of channels is carried out being transmitted to user terminal after the radio frequency synchronizing relay is handled;
Said base station utilizes said standard synchronous carrier signals that the radiofrequency signal of said a plurality of channels is carried out the radio frequency synchronizing relay and handles, and comprising:
Said base station utilizes the corresponding local frequency signal of frequency of said standard synchronous carrier signals generation and each channel, and clock sync signal;
Said base station utilizes the corresponding local frequency signal of frequency with each channel, and the radiofrequency signal of this channel is carried out down-converted, obtains the intermediate-freuqncy signal of each channel;
Analog-to-digital conversion is carried out with the intermediate-freuqncy signal of each channel in said base station, obtains the digital signal of each channel;
Said base station utilizes said clock sync signal that the digital signal of said each channel is carried out stored digital and handles, then through obtaining the intermediate-freuqncy signal of each channel after the digital-to-analogue conversion;
Said base station utilizes the corresponding local frequency signal of frequency with each channel, carries out upconversion process to said through the intermediate-freuqncy signal that obtains each channel after the digital-to-analogue conversion.
2. method according to claim 1 is characterized in that, said radio-frequency transmission channels is optical-fibre channel or microwave channel.
3. method according to claim 2 is characterized in that, the step that said base station utilizes said standard synchronous carrier signals that the radiofrequency signal of said a plurality of channels is carried out being transmitted to after the radio frequency synchronization delayed time is handled user terminal comprises:
Filtering Processing is carried out to the signal that receives through said radio-frequency transmission channels in said base station, obtains the radiofrequency signal of said a plurality of channels, and said standard synchronous carrier signals;
Said base station utilizes said standard synchronous carrier signals respectively the radiofrequency signal of each channel to be carried out the radio frequency synchronizing relay and handles;
Said base station will be passed through the emission of radio frequency signals of each channel after said radio frequency synchronizing relay is handled and give user terminal.
4. method according to claim 3 is characterized in that, said base station utilizes said standard synchronous carrier signals respectively the radiofrequency signal of each channel to be carried out radio frequency synchronizing relay processed steps to comprise:
Analog-to-digital conversion is carried out with the radiofrequency signal of each channel in said base station, obtains the digital signal of each channel;
Said base station utilizes said standard synchronous carrier signals that the digital signal of said each channel is carried out stored digital and handles, then through obtaining the radiofrequency signal of each channel after the digital-to-analogue conversion.
5. the emission system of a broadcast television signal is characterized in that, this system comprises:
Broadcast equipment is used to generate standard synchronous carrier signals, and adopts multiple modulation system that the radio and television baseband signal is modulated, and generates one group of radiofrequency signal that comprises a plurality of channels; Said radiofrequency signal and said standard synchronous carrier signals are transferred to the base station through radio-frequency transmission channels;
Said base station is used to utilize said standard synchronous carrier signals, and the radiofrequency signal of said a plurality of channels is carried out being transmitted to user terminal after the radio frequency synchronizing relay is handled; Said base station utilizes said standard synchronous carrier signals that the radiofrequency signal of said a plurality of channels is carried out the radio frequency synchronizing relay and handles; Comprise: said base station utilizes the corresponding local frequency signal of frequency of said standard synchronous carrier signals generation and each channel, and clock sync signal; Said base station utilizes the corresponding local frequency signal of frequency with each channel, and the radiofrequency signal of this channel is carried out down-converted, obtains the intermediate-freuqncy signal of each channel; Analog-to-digital conversion is carried out with the intermediate-freuqncy signal of each channel in said base station, obtains the digital signal of each channel; Said base station utilizes said clock sync signal that the digital signal of said each channel is carried out stored digital and handles, then through obtaining the intermediate-freuqncy signal of each channel after the digital-to-analogue conversion; Said base station utilizes the corresponding local frequency signal of frequency with each channel, carries out upconversion process to said through the intermediate-freuqncy signal that obtains each channel after the digital-to-analogue conversion.
6. system according to claim 5 is characterized in that, said broadcast equipment comprises:
Modulating unit is used to adopt multiple modulation system that the radio and television baseband signal is modulated, and generates one group of radiofrequency signal that comprises a plurality of channels;
Benchmark sync carrier generation unit is used to generate standard synchronous carrier signals;
The radio signal transmission unit is used for the radiofrequency signal of said standard synchronous carrier signals and said a plurality of channels is transferred to the base station through radio-frequency transmission channels.
7. according to claim 5 or 6 described systems, it is characterized in that said base station comprises:
The radio signal transmission unit is used for receiving the signal that said broadcast equipment sends through radio-frequency transmission channels;
Filter processing unit is used for the signal that receives through said radio-frequency transmission channels is carried out Filtering Processing, obtains the radiofrequency signal of said a plurality of channels, and said standard synchronous carrier signals;
The radio frequency synchronous processing unit is used to utilize said standard synchronous carrier signals respectively the radiofrequency signal of each channel to be carried out the radio frequency synchronizing relay and handles;
Transmitter unit is used for giving user terminal with the emission of radio frequency signals of each channel after handling through said radio frequency synchronizing relay.
8. system according to claim 7 is characterized in that, said radio frequency synchronous processing unit comprises:
AD conversion unit is used for the radiofrequency signal of each channel is carried out analog-to-digital conversion, obtains the digital signal of each channel;
The stored digital processing unit is used to utilize said standard synchronous carrier signals that the digital signal of said each channel is carried out stored digital and handles;
D/A conversion unit is used for obtaining the radiofrequency signal of each channel with carrying out digital-to-analogue conversion through the signal after the said stored digital processing unit processes.
9. system according to claim 7 is characterized in that, said radio frequency synchronous processing unit comprises:
The synchronizing frequency synthesis unit is used to utilize said standard synchronous carrier signals to generate and the corresponding local frequency signal of frequency of each channel, and clock sync signal;
Frequency conversion processing unit is used to utilize and the corresponding local frequency signal of the frequency of each channel, and the radiofrequency signal of this channel is carried out down-converted, obtains the intermediate-freuqncy signal of each channel;
AD conversion unit is used for the intermediate-freuqncy signal of each channel is carried out analog-to-digital conversion, obtains the digital signal of each channel;
The stored digital processing unit is used to utilize said clock sync signal that the digital signal of said each channel is carried out stored digital and handles;
D/A conversion unit is used for obtaining the intermediate-freuqncy signal of each channel with carrying out digital-to-analogue conversion through the signal after the said stored digital processing unit processes;
The upconversion process unit is used to utilize and the corresponding local frequency signal of the frequency of each channel, carries out upconversion process to said through the intermediate-freuqncy signal that obtains each channel after the digital-to-analogue conversion.
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| CN102420947A (en) * | 2011-11-17 | 2012-04-18 | 于立 | Digital television radio-frequency synchronous digital processing and overlaying method and system |
| CN107197390B (en) * | 2017-05-27 | 2019-11-12 | 上海东方明珠广播电视研究发展有限公司 | Wireless signal emission system, method, method for receiving and processing signal and terminal |
| CN109474836B (en) * | 2017-09-07 | 2020-10-09 | 北京泰美世纪科技有限公司 | Method and device for sending and receiving digital multimedia signals |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2406421Y (en) * | 2000-03-15 | 2000-11-15 | 杭州众力传输设备有限公司 | Frequency-modulation synchronous broadcasting network transmitter |
| CN101212638A (en) * | 2006-12-28 | 2008-07-02 | 周颖平 | On-channel audio/video signal transmission method and system |
| CN101287079A (en) * | 2008-05-21 | 2008-10-15 | 周颖平 | Transmission method, system and device for broadcast television signal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2406421Y (en) * | 2000-03-15 | 2000-11-15 | 杭州众力传输设备有限公司 | Frequency-modulation synchronous broadcasting network transmitter |
| CN101212638A (en) * | 2006-12-28 | 2008-07-02 | 周颖平 | On-channel audio/video signal transmission method and system |
| CN101287079A (en) * | 2008-05-21 | 2008-10-15 | 周颖平 | Transmission method, system and device for broadcast television signal |
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