CN201616884U - Single frequency network radio frequency adapter of digital television and broadband network system thereof - Google Patents
Single frequency network radio frequency adapter of digital television and broadband network system thereof Download PDFInfo
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- CN201616884U CN201616884U CN 200920164932 CN200920164932U CN201616884U CN 201616884 U CN201616884 U CN 201616884U CN 200920164932 CN200920164932 CN 200920164932 CN 200920164932 U CN200920164932 U CN 200920164932U CN 201616884 U CN201616884 U CN 201616884U
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Abstract
The utility model relates to a single frequency network radio frequency adapter of a digital television and a broadband network system thereof. The adapter comprises a programmable module, a broadband radio-frequency signal FM is converted into a broadband intermediate-frequency signal IF1 through down-conversion filtering, the IF1 is connected in an intermediate-frequency gain control module to obtain a broadband intermediate-frequency signal IF2 with constant signal power, then a digital signal DATA1 is obtained through A/D conversion and is connected in the programmable module to form DATA2=DATA1+delta t according to the set delay, then a broadband intermediate-frequency signal IF3 is obtained through D/A conversion with consistent frequency domain with the IF2 and delayed time domain, and finally the IF3 is converted into a delayed broadband radio-frequency signal through up-conversion filtering and recovery. The broadband network system is configured with the single frequency network radio frequency adapter. A multichannel audio/video program source becomes a small-signal broadband radio-frequency signal FM through an information source processing module, a channel processing module and a small-signal broadband synthesizer at the front end. The signal link is transmitted to each node, the single frequency network radio frequency adapter of each node adjusts the signal delay, each broadband transmitter carries out power amplification and transmission of the signal FM, the stability and overlay effect of the system are improved, and the cost is lowered.
Description
(1) technical field
The utility model relates to the Digital Television Terrestrial Broadcasting technical field, is specially a kind of digital television single-frequency network radio frequency adapter and adopts the digital television single-frequency network broadband network system of this single frequency network radio frequency adapter.
(2) background technology
At Digital Television Terrestrial Broadcasting (Digital Television Terrestrial Broadcasting, DTTB) in the network system, be multiple business needs such as satisfied mobile and fixing reception, in the uhf band of 300～3000MHz, adopt a plurality of channels (or channel) to launch simultaneously, (Single Frequency Network, SFN), this system entails relates to the processes such as engineering optimization that transmitting channel more becomes to build regional multichannel (or channel) single frequency network.The multichannel mono-frequency network system of DTTB (Multi-band SingleFrequency Network system, M-SFNS) front end needs the multiplex (MUX) treatment facility, as modulator, upconverter, adapter etc., the multi-section single channel transmitter also will synthesize through the high-power multiplexer of expensive multifrequency point, and the synthetic formed multichannel in back (or passage) is difficult to adjust at any time.
Improved plan is to adopt the wideband transmitter system to satisfy the Technology Need of multichannel emission.Though obviously overcoming multi-section single channel transmitter formed multichannel after multiplexer is synthetic, this improved plan is difficult to realize the defective adjusted at any time, but in building the broadband emission mode overlay network of multichannel single frequency network, need be before broadband signal produces be with the gps signal time reference to each channel by specific equipment (modulator, the single frequency adapter etc.) adjustment of delaying time respectively, to overcome the multipath interference.This has just increased considerably the project cost of system, increases system equipment quantity, reduces system's operational reliability, increases operating cost.Make the DTTB network limited for the bearing capacity of new business development needs such as tens cover TV programme, multichannel mobile TV, high definition TV.Thereby influenced the market fltting speed of DTTB large-scale promotion application.
For better faster development Digital Television Terrestrial Broadcasting network system, the single frequency network radio frequency adaptive device that needs development of new, coverage effect is good, stability is strong to make up, and project cost is low and the low Digital Television Terrestrial Broadcasting multiple spot single frequency network broadband emission local area network system of operating cost.
(3) utility model content
The purpose of this utility model provides a kind of digital television single-frequency network radio frequency adapter, carries out time delay adjustment on the wide band radio-frequency at the different nodes of network.
Another purpose of the present utility model provides a kind of Digital Television broadband network system that adopts above-mentioned single frequency network radio frequency adapter to make up, native system adopts the link transmission engineering of radiofrequency signal and single frequency network radio frequency adapter of the present utility model to adjust signal time delay, make that neither existing in the system frequency departure can adjust emission again covers signal time delay, improves the coverage effect and the stability of system.
The digital television single-frequency network radio frequency adapter structure of the utility model design is as follows: comprise down-conversion filtration module, reference clock, intermediate-frequency gain control module, also have programmable module, high speed analog-digital conversion and D/A converter module.Reference clock I and phase-locked loop module are formed the standard phase-locked loop circuit and are connected with programmable module and controlled by it, and the standard phase-locked loop circuit inserts the down-conversion filtration module respectively, sends into local oscillation signal f2.Contain a plurality of physical channel, be t fiducial time
0Broadband rf signal F
MThe signal source input insert the down-conversion filtration module, input signal carries out the one or many frequency conversion at this and local oscillation signal, by taking out the sideband of signal after the filtering, the output of the Wideband Intermediate Frequency signal IF1 that contains a plurality of wavelength coverages of down-conversion filtration module inserts the intermediate-frequency gain control module, the intermediate-frequency gain control module is eliminated the influence of the jitter of transmission link, intermediate-frequency gain control module signal power is constant, the Wideband Intermediate Frequency signal IF2 output that contains a plurality of wavelength coverages inserts the high speed A module, and high speed A module intermediate-freuqncy signal IF2 is converted into digital signal DATA1, output inserts programmable module.Programmable module is connected to data storage and keyboard display module.Programmable module is connected with phase-locked loop module, the output pll control signal.The local oscillation signal f3 output of reference clock II inserts high speed A module, programmable module and high speed D/A switch module.The low-limit frequency of f3 satisfies nyquist sampling theorem.Programmable module is sent the digital signal DATA1 that receives into data storage storage, and according to the delay duration Δ t of program setting, reads DATA1 according to the principle of first-in first-out from data storage, forms DATA2=DATA1+ Δ t.Programmable module is connected with high speed D/A switch module, the digital signal DATA2 output of finishing after the time-delay inserts high speed D/A switch module converts, the Wideband Intermediate Frequency signal IF3 that contains a plurality of wavelength coverages that obtains after the high speed D/A switch module converts, IF3 and IF2 are in full accord on frequency domain, but be on time domain through time-delay, IF3=IF2+ Δ t.The output of high speed D/A switch module inserts the up-conversion filtration module.The IF3 signal carries out the one or many frequency conversion at up-conversion filtration module and local oscillation signal f2, by taking out the sideband of signal after the filtering, the final broadband rf signal F that recovers to obtain being output as the process time-delay that contains a plurality of physical channel
M/ (t
0+ Δ t), thus realized time-delay adjustment to radiofrequency signal.When the hardware inherent delay of system is Ta, the final signal that then recovers is F
M/ (t
0+ Ta+ Δ t).
Programmable module can be on-site programmable gate array FPGA module or Digital Signal Processing DSP module.
When last down conversion filter carries out repeatedly frequency conversion, a plurality of local oscillation signal f2 can be arranged.
The intermediate-frequency gain control module is connected with programmable module, is subjected to its program control, makes IF2 power remain the steady state value of setting; Perhaps the intermediate-frequency gain control module is simulation auto-gain circuit AGC module.
The radiofrequency signal F of input
MOne or many frequency conversion through the down-conversion filtration module, programmable module output intermediate-freuqncy signal IF3 is through the one or many frequency conversion of up-conversion filtration module, the frequency variable of local oscillation signal is cancelled out each other in last down-conversion, thereby make that the frequency of input and output of this adapter is in full accord, got rid of the influence that inner local frequency deviation causes system fully.
The work clock of the sampling of the high speed D/A switch module in this adapter, the conversion of high speed A module, programmable module, the read-write clock of data storage have all adopted the local oscillation signal f3 of same reference clock II, make that like this frequency of the Wideband Intermediate Frequency signal IF2 of this adapter and IF3 is in full accord, data storage can not produce data yet and overflows or misplace simultaneously.
Digital Television broadband network system of the present utility model comprises fore-end, single-point multichannel transmitter module, signal link transmission and multiple spot multichannel radiating portion, and its multiple spot multichannel radiating portion has disposed single frequency network radio frequency adapter of the present utility model.
Fore-end comprises message source process module, channel processing module and small-signal broadband synthesizer.The multichannel audio-video frequency program source inserts the input of message source process module; Message source process module encodes the multichannel audio-video frequency program source respectively-and multiplexing, form MPTS (Multi-ProgramTransport Stream, MPTS) MPTS1～MPTSn on 1～n road.Wherein n is 2～199 positive integer.The multichannel MPTS output of message source process module is the corresponding exciter 1～n of access channel processing module respectively, modulates mapping, forms radiofrequency signal F1, the F2 of different channel after the frequency conversion respectively ... Fn.Each rf channel signal F1, F2 ... the radio frequency centre frequency of Fn is F
01, F
02F
0nRadiofrequency signal F1, the F2 of these different channels of each exciter output ... Fn inserts the small-signal broadband synthesizer, synthesizes the small-signal broadband rf signal F that contains n road channel
M, be t its fiducial time
0This small-signal broadband rf signal F
MFrequency spectrum is continuous or discontinuous.
Small-signal broadband rf signal F
MCan insert single-point multichannel transmitter module, this module has the wideband transmitter that contains power amplification circuit, directly by wideband transmitter to containing the broadband rf signal F of n physical channel
MCarry out launching after the power amplification; Perhaps, be connected to the signal converter of each node of this broadband network system through the signal link transmission, insert each single frequency network radio frequency adapter after the conversion of signals again, through the time delay of the corresponding radio-frequency input signals of single frequency network radio frequency adapter adjustment of each node, the wideband transmitter that contains power amplification circuit that connects each node again is to containing the broadband rf signal F of n physical channel
MCarry out launching after the power amplification.Signal transmission link is fiber optic network or cable network or microwave net etc., includes F1, F2 with what fore-end small-signal broadband synthesizer was sent ... the broadband rf signal FM of Fn delivers to each node 1, node 2 ... node N.N is 2～9999 positive integer.Each node link transmission range difference, radiofrequency signal recover the different propagation delay time t of each node in the chain circuit transmission time delay difference on the signal converter of each node
0, t
1, t
2T
NBroadband rf signal F
M/ t
0+ t
1, F
M/ t
0+ t
2F
M/ t
0+ t
N, t wherein
0Be initial time.t
0, t
1T
NIn maximum be tmax.The signal transmission link that the signal converter of each node is corresponding different is optical receiver or filter or frequency converter etc.
Node 1, node 2 ... node N has single frequency network radio frequency adapter 1, single frequency network radio frequency adapter 2 respectively ... single frequency network radio frequency adapter N.
The single frequency network radio frequency adapter 1 input broadband rf signal F of node 1
M/ t
0+ t
1, its additional signal time delay is tmax-t
1, output broadband rf signal F
M/ tmax+t
0
The single frequency network radio frequency adapter 2 input broadband rf signal F of node 2
M/ t
0+ t
2, its additional signal time delay is tmax-t
2, output broadband rf signal F
M/ tmax+t
0
The rest may be inferred, the single frequency network radio frequency adapter N input broadband rf signal F of node N
M/ t
0+ t
N, its additional signal time delay is tmax-t
N, output broadband rf signal F
M/ tmax+t
0
This signal is t at the x time of each node finally
0+ tmax.
The single frequency network radio frequency adapter of each node is respectively to separately input broadband rf signal F
MAfter carrying out the time delay adjustment, send into wideband transmitter 1, the wideband transmitter 2 of each node respectively ... wideband transmitter N.Each wideband transmitter carries out broadband signal power amplification and emission to radiofrequency signal, realizes the high coverage effect of native system.
The advantage of the utility model digital television single-frequency network radio frequency adapter and broadband network system thereof is:
1, realized in the multichannel single frequency network (M-SFNS) time delay of the broadband rf signal that contains a plurality of physical channel (spectrum) is accurately adjusted in the mode of digital processing; 2, the frequency of the input and output of this adapter is in full accord, has got rid of inner local frequency deviation fully to the influence that system causes, make Digital Television Terrestrial Broadcasting intersect the overlay area reception be improved significantly; 3, the signal transmission need not to rely on gps signal as benchmark in the signal transmission link of native system, need after carrying out single channel Channel Processing (modulation mapping, SFN adaptive), up-conversion, the power amplification of radio frequency single channel, each node not carry out high-power synthetic back emission more yet, exempt the synthetic transmitting power loss of multichannel power, effectively improved whole system operation efficient; 4, all use a plurality of physical channel of containing of same road (spectrum) broadband rf signal F in all nodes and the transmission link
M, therefore in whole overlay network, do not have frequency departure; 5, the inherent delay Ta of apparatus for radio frequency processing is minimum, and the intrinsic time delay Ta of all devices can also finely tune by the additional delay of single frequency network radio frequency adapter as a constant and compensate in the system link, has guaranteed that the time delay adjustment of each node is accurate; 6, native system adopts the link transmission of radiofrequency signal and single frequency network radio frequency adapter to adjust signal time delay, makes that neither existing frequency departure can adjust emission again in the system covers signal time delay, improved the coverage effect and the stability of system widely; 7, the utility model has not only guaranteed signal covering quality, and saved a large amount of equipment (as modulator, adapter etc.) in the system constructing, abandoned especially that inconvenient system transmitting channel is optimized and revised, expensive multifrequency point multiplexer influences the integrated engineering cost performance, effectively reduce project cost and operating cost, obviously promoted the Project Realization of multichannel single frequency network (M-SFNS) employing broadband emission mode.
(4) description of drawings
Fig. 1 is this digital TV monochromatic network radio frequency adapter example structure schematic diagram;
Fig. 2 is this digital TV broadband network system example structure schematic diagram.
(5) embodiment
Digital television single-frequency network radio frequency adapter embodiment
This digital TV monochromatic network radio frequency adapter example structure as shown in Figure 1.Comprise down-conversion filtration module, reference clock, intermediate-frequency gain control module, also have programmable module, high speed analog-digital conversion, D/A converter module.This routine programmable module is an on-site programmable gate array FPGA.
The thermostatic control crystal oscillator OCXO that this routine reference clock I is 10MHz, connect to form the standard phase-locked loop circuit with phase-locked loop module, this circuit is connected with programmable module and controlled by it, and phase-locked loop circuit inserts the down-conversion filtration module respectively, sends into the local oscillation signal f2 of 854MHz.
The wide band radio-frequency spectrum signal F of input
MCenter frequency point F
0MBe 714MHz, bandwidth is 40MHz.The FM signal has comprised 3 different channel signal F1, F2, F3 that effective bandwidth is 7.56MHz, its center frequency point F
01, F
02, F
03Be respectively 698MHz, 706MHz and 730MHz, be t fiducial time
0
Contain 3 physical channel, be t fiducial time
0Broadband rf signal F
MInsert the down-conversion filtration module, input signal carries out single-conversion at the local oscillation signal f2 of this and 854MHz, by the local oscillation signal of the low pass filter filters out 854MHz of 0～160MHz and the upper side band signal of 1568MHz, take out centre frequency 140MHz simultaneously, bandwidth is the lower sideband signal IF1 of 40MHz.The down-conversion filtration module inserts the intermediate-frequency gain control module, and the Wideband Intermediate Frequency signal IF2 of intermediate-frequency gain control module output inserts the high speed A module, and intermediate-freuqncy signal IF2 is converted into digital signal DATA1, inserts programmable module FPGA.
This routine intermediate-frequency gain control module is connected with programmable module, and the intermediate-frequency gain control module of 30dB is subjected to the program control of programmable module FPGA.The program of programmable module FPGA calculates the average power level of the Wideband Intermediate Frequency signal IF2 that contains a plurality of wavelength coverages according to the data DATA1 of the 10bitA/D sampling of high speed A module, constantly adjust the numerical value of intermediate-frequency gain control module simultaneously automatically, make IF2 power remain the steady state value of setting, the intermediate-frequency gain control module of numerical control can be transmitted the destabilizing factor of bringing into by erasure signal, and it is constant that transmitting power is kept all the time.
The high speed A module of 10bit and D/A switch module signal to noise ratio are about 62dB.Because the bandwidth of input signal is 40MHz, according to bandpass sample theory, the sampling rate of mould/number and D/A is 80MHz.
Programmable module FPGA is connected to high-speed data memory and the keyboard display module of 128MHz.
This routine reference clock II is the crystal oscillator of 80MHz, and it inserts high speed A module, programmable module and high speed D/A switch module with local oscillation signal f3.The low-limit frequency of f3 satisfies nyquist sampling theorem.
The IF2 intermediate-freuqncy signal writes the high-speed data memory of 128MHz with the speed of 80MHz according to logic after the 10bit digital signal DATA1 that the high speed A module converts becomes sends into programmable module FPGA processing, simultaneously programmable module FPGA according to the time-delay of program setting at Δ t constantly, principle with first-in first-out is read DATA1 from data storage, form DATA2=DATA1+ Δ t.Finish data DATA2 after the time-delay and send into 10bit high speed D/A switch module change under the speed of 80MHz clock, obtaining centre frequency again is 140MHz, and bandwidth is the broadband multiple spectra signal IF3 of 40MHz.IF3 is consistent on frequency domain with IF2, and IF3 has finished the Δ t time delay of IF2 on time domain, IF3=IF2+ Δ t=f2-(F
M/ t
0+ Δ t).High speed D/A switch module inserts the up-conversion filtration module.Center frequency point is after the local oscillation signal f2 of the IF3 signal of 140MHz and 854MHz carries out frequency conversion, by the local oscillation signal of the band pass filter filtering 854MHz of 694MHz～734MHz and the upper side band signal of 994MHz, finally recover the radiofrequency signal F that center frequency point is 714MHz, bandwidth 40MHz
M, F
MComprise 3 channel signals F1, F2, F3, the center frequency point F of F1, F2, F3
01, F
02, F
03Be respectively 698MHz, 706MHz and 730MHz, effective bandwidth is 7.56MHz respectively, has realized radiofrequency signal F
MΔ t time delay.
The inherent delay of this routine adapter hardware is Ta, so the total time-delay of this routine adapter is: Ta+ Δ t.Digital Television broadband network system embodiment
This digital TV broadband network system embodiment adopts the 16QAM modulation of C=1 option among the Chinese national standard GB20600-2006.This routine system configuration comprises fore-end, single-point multichannel transmitter module, signal link transmission and multiple spot multichannel radiating portion as shown in Figure 2, and its multiple spot multichannel radiating portion has disposed the single frequency network radio frequency adapter of the present utility model of last example.
Fore-end comprises message source process module, channel processing module and small-signal broadband synthesizer.Tens cover standard definition television program source such as (containing some high definition TVs) are sent into message source process module, encode respectively in this multichannel audio-video frequency program source-multiplexing, are divided into MPTS MPTS1, MPTS2 and the MPTS3 of 3 channels.3 road MPTS output of message source process module inserts corresponding exciter 1～3 respectively, modulate and up-conversion, form small-power radiofrequency signal F1, F2, the F3 of different channel respectively, their channel signals effective bandwidth is 7.56MHz, and channel bandwidth is 8MHz.The center frequency point F of F1
01Be 698MHz; The center frequency point F of F2
02Be 706MHz; The center frequency point F of F3
03Be 730MHz.The radiofrequency signal F1 of these different channels, F2, F3 insert the small-signal broadband synthesizer, synthesize the small-signal broadband rf signal F that contains 3 channels
M/ t
0, its center frequency point F
0MBe 714MHz, its total bandwidth is 40MHz, and be t fiducial time
0Wherein F1 and F2 are adjacent spectrum again and again, and F3 is every frequent spectrum.
Small-signal broadband rf signal F
M/ t
0A road insert single-point multichannel transmitter module, directly through wideband transmitter A to containing the broadband rf signal F of 3 physical channel
M/ t
0Carry out launching after the power amplification.Emission need not the time delay adjustment for single-point.
Small-signal broadband rf signal F
M/ t
0Also deliver to 3 nodes of this wideband transmitter network system through the signal link transmission, through the time delay of the corresponding radio-frequency input signals of single frequency network radio frequency adapter adjustment of each node, the wideband transmitter through each node carries out launching after the power amplification to the broadband rf signal FM that contains n physical channel again.
This routine signal transmission link is a fiber optic network, is not transmission MPTS MPTS, but directly will include the wide band radio-frequency spectrum signal F of F1, F2, F3
M/ t
0Be transferred to 3 nodes by fiber optic network.Signal converter optical receiver at each node recovers the wide band radio-frequency spectrum signal F that includes F1, F2, F3
M, send into single frequency network radio frequency adapter 1, single frequency network radio frequency adapter 2, the single frequency network radio frequency adapter 3 of each node respectively.
The fiber lengths 10km of this routine node 1, the link signal time delay that causes is t1=33 μ s; The fiber lengths 30km of node 2, the link signal time delay that causes is t2=100 μ s; The fiber lengths 50km of node 3, the link signal time delay that causes is t3=167 μ s, maximum delay tmax=167 μ s.For guaranteeing the reliable reception of the intersection area of coverage that 3 nodes are launched, come the school to transfer the time-delay of each node by the maximum delay in this system for reference, the additional delay of setting the single frequency network radio frequency adapter 1 of node 1 thus is tmax-t1=134 μ s, the additional delay of the single frequency network radio frequency adapter 2 of node 2 is tmax-t2=67 μ s, and the additional delay of the single frequency network radio frequency adapter 1 of node 3 is tmax-t3=0 μ s.The broadband rf signal of each node output is F
M/ tmax+t0, promptly this signal is t at the x time of each node finally
0+ 167 μ s.
The single frequency network radio frequency adapter of each node is respectively to separately input broadband rf signal F
MAfter carrying out the time delay adjustment, send into wideband transmitter 1, wideband transmitter 2, the wideband transmitter 3 of each node respectively.Each wideband transmitter carries out broadband signal power amplification and emission to radiofrequency signal.
The wide band radio-frequency spectrum signal FM that includes F1, F2, F3 of 3 launch points delays when adjusting through single frequency network radio frequency adapter separately, forms 3 identical contents, same frequency, the same transmit wide band radio-frequency spectrum signal (F that includes F1, F2, F3 constantly
M/ t
0+ 167 μ s); This signal is launched by wideband transmitter separately respectively, forms a multichannel mono-frequency network system M-SFNS that the employing wideband transmitter of 3 launch points and 3 physical channel is arranged.
The intrinsic time delay Ta of all devices is as the additional delay fine setting compensation of a constant by the single frequency network radio frequency adapter in system link.
The foregoing description is the specific case that the purpose of this utility model, technical scheme and beneficial effect are further described only, and the utility model is not to be defined in this.All any modifications of within scope of disclosure of the present utility model, being made, be equal to replacement, improvement etc., all be included within the protection range of the present utility model.
Claims (6)
1. Digital Television Terrestrial Broadcasting single frequency network radio frequency adapter comprises down-conversion filtration module, reference clock, intermediate-frequency gain control module, it is characterized in that:
Also have programmable module, high speed mould/number and D/A switch module;
The reference clock I is formed the standard phase-locked loop circuit with phase-locked loop module and is connected with programmable module, and the standard phase-locked loop circuit inserts the down-conversion filtration module respectively; Contain a plurality of physical channel, be t fiducial time
0Broadband rf signal F
MThe signal source input insert the down-conversion filtration module, the output of the Wideband Intermediate Frequency signal IF1 that contains a plurality of wavelength coverages of down-conversion filtration module inserts the intermediate-frequency gain control module; The signal power of intermediate-frequency gain control module Wideband Intermediate Frequency signal constant, that contain a plurality of wavelength coverages IF2 output inserts the high speed A module, and the digital signal DATA1 output of high speed A module converts inserts programmable module; Programmable module is connected to data storage and keyboard display module, and programmable module is connected with phase-locked loop module; The local oscillation signal f3 output of reference clock II inserts high speed A module, programmable module and high speed D/A switch module; The digital signal DATA2 output of finishing after the time-delay of programmable module inserts high speed D/A switch module, the output of the Wideband Intermediate Frequency signal IF3 of a plurality of wavelength coverages of high speed D/A switch module inserts the up-conversion filtration module, and the up-conversion filtration module is output as the broadband rf signal F through time-delay that contains a plurality of physical channel
M/ (t
0+ Δ t).
2. Digital Television Terrestrial Broadcasting single frequency network radio frequency adapter according to claim 1 is characterized in that:
Described programmable module can be the on-site programmable gate array FPGA module or is Digital Signal Processing DSP module.
3. Digital Television Terrestrial Broadcasting single frequency network radio frequency adapter according to claim 1 is characterized in that:
The intermediate-frequency gain control module is connected with programmable module; Perhaps the intermediate-frequency gain control module is handled for simulation auto-gain circuit agc circuit.
4. Digital Television Terrestrial Broadcasting broadband emission network system comprises fore-end, signal transmission link and multiple spot multichannel radiating portion, it is characterized in that:
Described multiple spot multichannel radiating portion has disposed each described Digital Television Terrestrial Broadcasting single frequency network radio frequency adapter in the claim 1 to 3;
Fore-end comprises message source process module, channel processing module and small-signal broadband synthesizer, and the multichannel audio-video frequency program source inserts the input of message source process module; The multichannel MPTS output of message source process module is the corresponding exciter 1～n of access channel processing module respectively, and wherein n is 2～199 positive integer; Rf channel signal F1, the F2 of each exciter output ... Fn inserts the small-signal broadband synthesizer;
Small-signal broadband rf signal F
MBe connected to the signal converter of each node of this broadband network system through signal link, insert each single frequency network radio frequency adapter again, the single frequency network radio frequency adapter of each node connects the corresponding wideband transmitter that contains power amplification circuit.
5. Digital Television Terrestrial Broadcasting broadband emission network system according to claim 4 is characterized in that:
Described signal transmission link is fiber optic network or cable network or microwave net, and the signal converter respective signal transmission link of described each node is optical receiver or filter or frequency converter.
6. Digital Television Terrestrial Broadcasting broadband emission network system according to claim 4 is characterized in that:
Described small-signal broadband synthesizer also inserts single-point multichannel transmitter module, and this module has the wideband transmitter that contains power amplification circuit.
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| CN 200920164932 CN201616884U (en) | 2009-12-05 | 2009-12-05 | Single frequency network radio frequency adapter of digital television and broadband network system thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920164932 CN201616884U (en) | 2009-12-05 | 2009-12-05 | Single frequency network radio frequency adapter of digital television and broadband network system thereof |
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| Publication Number | Publication Date |
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| CN201616884U true CN201616884U (en) | 2010-10-27 |
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ID=43003245
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112653479A (en) * | 2020-12-16 | 2021-04-13 | 重庆邮电大学 | DMB baseband SoC supporting single frequency network function |
-
2009
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112653479A (en) * | 2020-12-16 | 2021-04-13 | 重庆邮电大学 | DMB baseband SoC supporting single frequency network function |
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Granted publication date: 20101027 Effective date of abandoning: 20091205 |