CN101500098A - Transmission method and system for broadcast television signal - Google Patents
Transmission method and system for broadcast television signal Download PDFInfo
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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, at 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 by two transmitting base stations (being transmitting base station A and transmitting base station B).As can be seen from Figure 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 respectively through entering power combiner after delay equalization processing and the power amplification processing.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 by optical fiber transmission network respectively, digital baseband signal is being launched after synthetic and antenna-feedback system is handled by 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, the gps clock source, sync adapters, modulator drivers etc. all are self-existent at the broadcast television signal of different modulating standard respectively, therefore, prior art is when setting up the synchronous overlay network of the multiple modulation system of multichannel, and it is too much to exist the transmission channel resource occupation, system synchronization must rely on external clock equipment such as GPS, the networking debugging is complicated, equipment cost is than problems such as height.
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;
Described broadcast equipment is transferred to the base station with described radiofrequency signal and described standard synchronous carrier signals by radio-frequency transmission channels;
Described base station utilizes described standard synchronous carrier signals that the radiofrequency signal of described a plurality of channels is carried out being transmitted to user terminal after the radio frequency synchronizing relay is handled.
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; Described radiofrequency signal and described standard synchronous carrier signals are transferred to the base station by radio-frequency transmission channels;
Described base station is used to utilize described standard synchronous carrier signals, and the radiofrequency signal of described a plurality of channels is carried out being transmitted to user terminal after the radio frequency synchronizing relay is handled.
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; Described broadcast equipment is transferred to the base station with described radiofrequency signal and described standard synchronous carrier signals by radio-frequency transmission channels; Described base station utilizes described standard synchronous carrier signals that the radiofrequency signal of described 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, reduced 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, by standard synchronous carrier signals the radiofrequency signal of a plurality of channels being carried out the radio frequency synchronizing relay handles, 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 simpler, convenient.
Description of drawings
Fig. 1 is that the terrestrial wireless TV covers the networking schematic diagram in the prior art;
The general structure schematic diagram 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 schematic diagram 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 (comprises anolog TV signals with the modulator of multiple standards, the modulator of standards such as digital television signal) radiofrequency signal of each channel broadcasting TV signal of Chan Shenging, and standard synchronous carrier signals, be sent to each base station through radio-frequency transmission channels (for example optical fiber or microwave etc.), transparent radio frequency Synchronous Processing is fully carried out to each channel radiofrequency signal in each base station under the control of standard synchronous carrier signals, radiofrequency signal after the Synchronous Processing is amplified through each channel power, power is synthetic, antenna-feedback system sends to the (simulation of different modulating standard, standards such as numeral) user terminal, thereby realized the multiple modulation system of terrestrial broadcast television signal, multichannel common transmitted passage carries 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, therefore 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 station 12.
Described 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, described 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 signal.
Benchmark sync carrier generation unit 112 is used to generate standard synchronous carrier signals.
Described benchmark sync carrier generation unit 112 can be the frequency oscillator that not influenced by temperature etc. of high stability.Described 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 this standard synchronous carrier signals is different with the frequency of the radiofrequency signal of each channel of modulating unit 111 generations, promptly can not disturb radiofrequency signal.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 by radio-frequency transmission channels together with the radiofrequency signal that described modulating unit 111 adopts multiple modulation system modulation to obtain.
Preferably, described base station 12 comprises:
Radio signal transmission unit 121 is used for receiving the signal that broadcast equipment 11 sends by 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, described 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 save cost with the purpose that radiofrequency signal is converted to intermediate-freuqncy signal, 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, described radio frequency synchronous processing unit 123 can also only comprise:
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, described radio-frequency transmission channels is optical-fibre channel or microwave channel.
Described radio signal transmission unit 113 and radio signal transmission unit 121 are radio frequency optical transceiver, microwave machine or satellite-transmission gear.
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 to be transferred to the path delay of time of first base station in this optical fiber 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 4845us need delay time radiofrequency signal in first base station, 4627.5us need delay time radiofrequency signal in second base station, 4384us need delay time radiofrequency signal in the 3rd base station, 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.
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 different resulting broadcast television signals of modulation system 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 different modulation system 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 by same transport vehicle, is sent to each transmitting base station as optical transceiver or microwave machine.
In each base station, by corresponding transport vehicle, receive the broadcast television signal that broadcast equipment sends as optical transceiver or microwave machine, and extract standard synchronous carrier signals by 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 at 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 of CH20 correspondence generates is 520MHz, and then low-converter is converted to the radiofrequency signal of 530MHz 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 of CH22 correspondence generates is 536MHz, and then low-converter is converted to the radiofrequency signal of 546MHz 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 described standard synchronous carrier signals of a plurality of channel broadcasting TV signal by 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 by radio-frequency transmission channels in step 1, base station, obtains the radiofrequency signal of a plurality of channel broadcasting TV signal, 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 of each channel after step 3, base station will be handled through the radio frequency synchronizing relay is transmitted to various user terminals.
Preferably, described 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, described 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; Described broadcast equipment is transferred to the base station with described radiofrequency signal and described standard synchronous carrier signals by radio-frequency transmission channels; Described base station utilizes described standard synchronous carrier signals that the radiofrequency signal of described 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, reduced 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, by standard synchronous carrier signals the radiofrequency signal of a plurality of channels being carried out the radio frequency synchronizing relay handles, 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 simpler, 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, 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:
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;
Described broadcast equipment is transferred to the base station with described radiofrequency signal and described standard synchronous carrier signals by radio-frequency transmission channels;
Described base station utilizes described standard synchronous carrier signals that the radiofrequency signal of described a plurality of channels is carried out being transmitted to user terminal after the radio frequency synchronizing relay is handled.
2, method according to claim 1 is characterized in that, described radio-frequency transmission channels is optical-fibre channel or microwave channel.
3, method according to claim 2 is characterized in that, the step that described base station utilizes described standard synchronous carrier signals that the radiofrequency signal of described 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 by described radio-frequency transmission channels in described base station, obtains the radiofrequency signal of described a plurality of channels, and described standard synchronous carrier signals;
Described base station utilizes described standard synchronous carrier signals respectively the radiofrequency signal of each channel to be carried out the radio frequency synchronizing relay and handles;
The emission of radio frequency signals of each channel after described base station will be handled through described radio frequency synchronizing relay is given user terminal.
4, method according to claim 3 is characterized in that, described base station utilizes described standard synchronous carrier signals respectively the radiofrequency signal of each channel to be carried out the step that the radio frequency synchronizing relay handles to comprise:
Analog-to-digital conversion is carried out with the radiofrequency signal of each channel in described base station, obtains the digital signal of each channel;
Described base station utilizes described standard synchronous carrier signals that the digital signal of described 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, method according to claim 3 is characterized in that, described base station utilizes described standard synchronous carrier signals respectively the radiofrequency signal of each channel to be carried out the step that the radio frequency synchronizing relay handles to comprise:
Described base station utilizes the corresponding local frequency signal of frequency of described standard synchronous carrier signals generation and each channel, and clock sync signal;
Described 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 described base station, obtains the digital signal of each channel;
Described base station utilizes described clock sync signal that the digital signal of described 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;
Described base station utilizes the corresponding local frequency signal of frequency with each channel, and the intermediate-freuqncy signal of described each channel is carried out upconversion process.
6, a kind of emission system of 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; Described radiofrequency signal and described standard synchronous carrier signals are transferred to the base station by radio-frequency transmission channels;
Described base station is used to utilize described standard synchronous carrier signals, and the radiofrequency signal of described a plurality of channels is carried out being transmitted to user terminal after the radio frequency synchronizing relay is handled.
7, system according to claim 6 is characterized in that, described 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 described standard synchronous carrier signals and described a plurality of channels is transferred to the base station by radio-frequency transmission channels.
8, according to claim 6 or 7 described systems, it is characterized in that described base station comprises:
The radio signal transmission unit is used for receiving the signal that described broadcast equipment sends by radio-frequency transmission channels;
Filter processing unit is used for the signal that receives by described radio-frequency transmission channels is carried out Filtering Processing, obtains the radiofrequency signal of described a plurality of channels, and described standard synchronous carrier signals;
The radio frequency synchronous processing unit is used to utilize described 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 described radio frequency synchronizing relay.
9, system according to claim 8 is characterized in that, described 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 described standard synchronous carrier signals that the digital signal of described 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 described stored digital processing unit processes.
10, system according to claim 8 is characterized in that, described radio frequency synchronous processing unit comprises:
The synchronizing frequency synthesis unit is used to utilize described 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 described clock sync signal that the digital signal of described 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 described 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, and the intermediate-freuqncy signal of described each channel is carried out upconversion process.
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| CN2009100069472A CN101500098B (en) | 2009-02-13 | 2009-02-13 | Transmission method and system for broadcast television signal |
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| CN2009100069472A CN101500098B (en) | 2009-02-13 | 2009-02-13 | Transmission method and system for broadcast television signal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102420947A (en) * | 2011-11-17 | 2012-04-18 | 于立 | Digital television radio-frequency synchronous digital processing and overlaying method and system |
| CN109474836A (en) * | 2017-09-07 | 2019-03-15 | 北京泰美世纪科技有限公司 | The sending, receiving method and device of digital multimedia signal |
| 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 |
Family Cites Families (3)
| 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 |
| CN101212638B (en) * | 2006-12-28 | 2010-09-08 | 南京同频微波技术股份有限公司 | On-channel audio/video signal transmission method and system |
| CN101287079B (en) * | 2008-05-21 | 2010-09-08 | 周颖平 | Transmission method, system and device for broadcast television signal |
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2009
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109474836A (en) * | 2017-09-07 | 2019-03-15 | 北京泰美世纪科技有限公司 | The sending, receiving method and device of digital multimedia signal |
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