CN102281407B - Method and device for performing digitized reconstruction on analog television transmitter - Google Patents
Method and device for performing digitized reconstruction on analog television transmitter Download PDFInfo
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Abstract
The invention discloses a method and a device for performing digitized reconstruction on an analog television transmitter. An analog signal modulator which is equipped on the original analog television transmitter and a radio frequency signal distributor of a power amplifier unit of the original analog television transmitter are removed; and a digital television excitation amplification device is connected between an input video/audio TS data stream and a part of the power amplifier unit of the original analog television transmitter after the radio frequency signal distributor is removed, and is cooperated with the part of the power amplifier unit of the original analog television transmitter after the radio frequency signal distributor is removed, so that the aim that the analog television transmitter is subjected to digitized reconstruction is fulfilled. By the method and the device, useful devices of the original analog television transmitter can be utilized completely, so that the digitized process of each television station from analog television terrestrial broadcasting to digital television terrestrial broadcasting is accelerated, and expenses required at the early stage of the digitized process are reduced.
Description
Technical field
The present invention relates to the television transmitter technical field, specifically the simulated television transmitter reform is become a kind of method of digital TV transmitter and related device thereof.
Background technology
The development of digital technology has promoted advancing of digital television techniques, makes it to become one of technology with fastest developing speed over nearly 20 years.The Digital Television industry of China develops rapidly, has entered the epoch that Digital Television replaces simulated television, and Digital Television Terrestrial Broadcasting has started broadcasting in hundreds of cities.Adopt digital technology not only can make various television equipments obtain the performance higher, but also can realize the new function that analogue technique can't realize than original analogue means.
Yet Digital Television Terrestrial Broadcasting replaces the simulated television terrestrial broadcasting its process development, in certain stage, the state of simulated television ground broadcast signal and digital television ground broadcast signal coexistence must occur.Any one is with the TV station of simulated television terrestrial broadcasting mode work, when finishing the working method conversion from the simulated television terrestrial broadcasting to Digital Television Terrestrial Broadcasting, one of its major measure must be replaced by digital television ground broadcast transmitter with the simulated television ground broadcast transmitter.For the related television transmitter of domestic thousands of TV stations above county level (it possesses the anolog TV signals terrestrial broadcasting emissivities of a television channel at least) will be huge quantity, and the digital improvement of all TV stations also will need huge expense total amount.Even the economically underdeveloped area active demand of accelerating the digitlization process is also arranged, but the simulated television terrestrial broadcasting is converted to the key factor that the required expense of Digital Television Terrestrial Broadcasting restricts its development often.
With regard to the circuit of simulated television transmitter constituted, not to be both the rf modulations mode different with the maximum of digital TV transmitter for they, i.e. the exciter that is adopted separately (or modulator) difference, and that radio-frequency (RF) power amplification is partly removed index error is unusual, there is no the essence difference.
The typical circuit that Fig. 1 is the simulated television transmitter constitutes.The radio-frequency modulator unit 11 of this simulated television transmitter has adopted dual-modulator configuration (comprising modulator A111 and modulator B112), analogue audio frequency and vision signal from signal source input to radio-frequency modulator unit 11, form simulated television radio frequency output signal, carry out the automatic selection of dual-modulator by modulation switch 113, and export the radio frequency output signal of radio-frequency modulator unit 11 to power amplifier unit 12; Radiofrequency signal distributor 121 in the power amplifier unit 12 is with the identical radiofrequency signal of simulated television radiofrequency signal demultiplexing of input, deliver to respectively in the identical power amplifier module 122.1 to 121.n of multichannel (such as the n road) and carry out power amplification, it is synthetic that the simulated television radiofrequency signal of multichannel (such as the n road) power amplifier module being amplified respectively by radio-frequency (RF) power combiner 123 is carried out power, the synthetic radio frequency power output of power exports the radio-frequency filter that is connected with transmitter to, carries out the anolog TV signals broadcast transmission until antenna-feedback system.
The typical circuit that Fig. 2 is digital TV transmitter constitutes.Digital TV transmitter has also comprised radio-frequency modulator unit 21 and power amplifier unit 22, the operation principle of digital TV transmitter is similar to the simulated television transmitter, but be to have adopted digital modulator (being digital signal modulator A211 and modulator B212) in its radio-frequency modulator unit 21, and the input signal of modulator is the TS data flow that video/audio closes the road.The output of radio-frequency modulator unit 21 is carried out the automatic selection of dual-modulator by modulation switch 213 equally, and exports the radio frequency output signal of radio-frequency modulator unit 21 to power amplifier unit 22; Radiofrequency signal distributor 221 in the power amplifier unit 22 is with the identical radiofrequency signal of Digital Television radiofrequency signal demultiplexing of input, deliver to respectively in the identical power amplifier module 222.1 to 221.n of multichannel (such as the n road) and carry out power amplification, it is synthetic that the Digital Television radiofrequency signal of multichannel (such as the n road) power amplifier module being amplified respectively by radio-frequency (RF) power combiner 223 is carried out power, the synthetic radio frequency power output of power exports the radio-frequency filter that is connected with transmitter to, carries out the digital television signal broadcast emission until antenna-feedback system.
Comparison by Fig. 1 and Fig. 2, the power amplifier unit of being not difficult to find out the simulated television transmitter is identical with the effect of the power amplifier unit of digital TV transmitter, under certain conditions, be the power amplifier unit that the power amplifier unit of simulated television transmitter can be used as digital TV transmitter.
Therefore, utilize the useful assembly part of original simulated television transmitter, increase the required device part of digital TV transmitter, just can carry out digital improvement, make it to be suitable for the terrestrial broadcasting emission of digital television signal original simulated television transmitter.But, still do not carry out at present the development and use of this respect, make the simulated television terrestrial broadcasting be converted to the required appropriate litigation fees height of Digital Television Terrestrial Broadcasting, very be unfavorable for working method conversion from the simulated television terrestrial broadcasting to Digital Television Terrestrial Broadcasting, thereby, also just influenced the digitlization process.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of simulated television transmitter digital improvement method and device are provided, the useful assembly that can make full use of original simulated television transmitter is realized the conversion of anolog TV signals terrestrial broadcasting emission to digital television signal terrestrial broadcasting emission, thereby realized accelerating each TV station from the digitlization process of simulated television terrestrial broadcasting, and reduced this digitlization process required expense in early stage effectively to Digital Television Terrestrial Broadcasting.
The technical solution adopted for the present invention to solve the technical problems is: a kind of simulated television transmitter digital improvement method comprises the steps:
The analog signal modulator that A, the original simulated television transmitter of dismounting are equipped with, the Digital Television of packing into excitation amplifying device; This locality that this Digital Television excitation amplifying device is provided with a radiofrequency signal output that is used for the signal input part of input video/audio TS data flow, a plurality of power amplifier unit output multi-channel rf signals to the back-end and is used for carrying out running parameter setting and adjustment is provided with input;
B, remove radiofrequency signal distributor in original simulated television transmitter power amplifier unit, determine the signal input port of a plurality of power amplifier modules of this power amplifier unit;
C, Digital Television is encouraged amplifying device a plurality of radiofrequency signal outputs respectively with a plurality of corresponding being connected of power amplifier module signal input port of this power amplifier unit;
D, determine whether the working channel of the radio frequency output filter that former simulation television transmitter is connected is suitable, if the transmission of television working channel difference before and after implementing then need be changed corresponding radio-frequency filter;
E, this locality control button that input connects is set, the running parameter of Digital Television excitation amplifying device is set, make the radiofrequency signal of output expectation working channel and expectation modulation system, and satisfy the signal level requirement of power amplifier module by this locality;
F, digital video audio TS data flow is inserted the signal input part of Digital Television excitation amplifying device, and the output signal of the radio-frequency (RF) power combiner that power amplifier module is connected is carried out the detection of signal quality;
G, according to detection to the index signal output of radio-frequency (RF) power combiner; by this locality this locality control button that input connects is set; the running parameter of opposed Digital Television excitation amplifying device is set and is adjusted; setting and adjustment that draw together is started to control level, predistortion correction, protective circuit make the signal quality that is detected obtain optimum state.
Further, this simulated television transmitter digital improvement method also is included in the Digital Television excitation amplifying device remote monitoring interface is set, be connected with the control appliance of remote control terminal by this remote monitoring interface, utilize control appliance to carry out the setting and the adjusting of telemonitoring and running parameter thereof.
A kind of simulated television transmitter digital improvement method of the present invention, be mainly used to the transformation of putting formula simulated television transmitter at closing, if former simulation television transmitter is put formula for dividing, then also need remove its sound accompaniment power amplifier, only utilize its image power amplifier to implement adaptation step and get final product.
A kind of device of simulated television transmitter digital improvement is included in and is connected a Digital Television between the parts of removing in the power amplifier unit of input video/audio TS data flow and original simulated television transmitter behind the radiofrequency signal distributor and encourages amplifying device; This locality that this Digital Television excitation amplifying device is provided with a radiofrequency signal output that is used for the signal input part of input video/audio TS data flow, a plurality of power amplifier unit output multi-channel rf signals to the back-end and is used for carrying out running parameter setting and adjustment is provided with input; Excitation includes a digital signal modulator, radiofrequency signal driving amplifier, automatic level controller, radio frequency multichannel homophase distributor and this locality in the amplifying device input is set; The input of digital signal modulator is connected with signal input part; The output of digital signal modulator is connected to the input of radiofrequency signal driving amplifier, and the output of radiofrequency signal driving amplifier is connected to the input of radio frequency multichannel homophase distributor; A plurality of outputs of radio frequency multichannel homophase distributor by the multi-channel rf signal output part respectively with the power amplifier unit of original simulated television transmitter in remove a plurality of power amplifier modules of the parts behind the radiofrequency signal distributor corresponding being connected of signal input port; The input of automatic level controller is connected to the output of radiofrequency signal driving amplifier, and the output of automatic level controller is connected to the control end of radiofrequency signal driving amplifier; This locality is provided with input and is connected with the adjustable side of digital signal modulator, radiofrequency signal driving amplifier respectively.
Described excitation amplifying device also is provided with the remote monitoring interface, and this remote monitoring interface is connected with the adjustable side of digital signal modulator, radiofrequency signal driving amplifier respectively.
The device of a kind of simulated television transmitter digital improvement of the present invention, the signal input part of Digital Television excitation amplifying device is used for connecting the video/audio TS data flow of input and exports to the digital signal modulator, the digital signal modulator is exported to the digital signal driving amplifier with modulated digital video audio frequency low level radiofrequency signal, the digital signal driving amplifier carries out radiofrequency signal to output to the multichannel distribution that radio frequency multichannel homophase distributor carries out this radiofrequency signal behind the linear amplification, radio frequency multichannel homophase distributor is exported homophase multi-channel rf signal, and is connected with the radiofrequency signal output.Encourage the multi-channel rf signal correspondence of amplifying device output to be defeated by in the input port of the parts behind the dismounting radiofrequency signal distributor in the power amplifier unit of original simulated television transmitter by Digital Television, be that correspondence is defeated by the multichannel power amplifier module, power amplifier module exports radio-frequency (RF) power combiner to after the radiofrequency signal of input is amplified, radio-frequency (RF) power combiner outputs to the radio-frequency power output port after then the multi-channel rf signal of importing being synthesized, and the radio-frequency power output port is exported radio-frequency filter again and is connected to antenna-feedback system and carries out the digital television signal broadcast emission.The excitation amplifying device of digital TV transmitter is provided with this locality input and remote monitoring interface is set, this locality is provided with input and is used for connecting local control button, digital signal modulator and radiofrequency signal driving amplifier are carried out running parameter setting and adjustment, the remote monitoring interface is used for connecting remote control equipment, and the running parameter of digital signal modulator and radiofrequency signal driving amplifier is carried out remote monitoring and long-range setting.The automatic electric-level control loop is used for the output signal of radiofrequency signal driving amplifier is carried out level detection.
The invention has the beneficial effects as follows, owing to adopted on the basis of simulated television transmitter and transformed, promptly in the power amplifier unit of input video/audio TS data flow and original simulated television transmitter, remove and is connected a Digital Television between the parts behind the radiofrequency signal distributor and encourages amplifying device, just the power amplifier unit of simulated television transmitter is used as the power amplifier unit of digital TV transmitter, made full use of the useful assembly of original simulated television transmitter, thereby realize accelerating each TV station from the digitlization process of simulated television terrestrial broadcasting, and can effectively reduce this digitlization process required expense in early stage to Digital Television Terrestrial Broadcasting.
Below in conjunction with drawings and Examples the present invention is described in further detail; But a kind of simulated television transmitter digital improvement method of the present invention and device are not limited to embodiment.
Description of drawings
Fig. 1 is that the simulated television transmitter principle constitutes schematic diagram;
Fig. 2 is that the digital TV transmitter principle constitutes schematic diagram;
Fig. 3 is that the principle of Digital Television excitation amplifying device of the present invention constitutes schematic diagram;
Fig. 4 is that embodiment of the invention principle constitutes schematic diagram.
Embodiment
Embodiment, a kind of simulated television transmitter digital improvement method of the present invention comprises the steps:
The analog signal modulator that A, the original simulated television transmitter of dismounting are equipped with, the Digital Television of packing into excitation amplifying device; This locality that this Digital Television excitation amplifying device is provided with a radiofrequency signal output that is used for the signal input part of input video/audio TS data flow, a plurality of power amplifier unit output multi-channel rf signals to the back-end and is used for carrying out running parameter setting and adjustment is provided with input; And the quantity of a plurality of radio-frequency (RF) output end mouths is consistent with the quantity of power amplifier unit signal input port;
B, remove radiofrequency signal distributor in original simulated television transmitter power amplifier unit, determine the signal input port of a plurality of power amplifier modules of this power amplifier unit;
C, Digital Television is encouraged amplifying device a plurality of radiofrequency signal outputs respectively with a plurality of corresponding being connected of power amplifier module signal input port of this power amplifier unit;
D, determine whether the working channel of the radio frequency output filter that former simulation television transmitter is connected is suitable, if the transmission of television working channel difference before and after implementing then need be changed corresponding radio-frequency filter;
E, this locality control button that input connects is set, the running parameter of Digital Television excitation amplifying device is set, make the radiofrequency signal of output expectation working channel and expectation modulation system, and satisfy the signal level requirement of power amplifier module by this locality;
F, digital video audio TS data flow is inserted the signal input part of Digital Television excitation amplifying device, and the output signal of the radio-frequency (RF) power combiner that power amplifier module is connected is carried out the detection of signal quality;
G, according to detection to the index signal output of radio-frequency (RF) power combiner; by this locality this locality control button that input connects is set; the running parameter of opposed Digital Television excitation amplifying device is set and is adjusted; setting and adjustment that draw together is started to control level, predistortion correction, protective circuit make the signal quality that is detected obtain optimum state.
Further, this simulated television transmitter digital improvement method also is included in the Digital Television excitation amplifying device remote monitoring interface is set, be connected with the control appliance of remote control terminal by this remote monitoring interface, utilize control appliance to carry out the setting and the adjusting of telemonitoring and running parameter thereof.
A kind of simulated television transmitter digital improvement method of the present invention, be mainly used to the transformation of putting formula simulated television transmitter at closing, if former simulation television transmitter is put formula for dividing, then also need remove its sound accompaniment power amplifier, only utilize its image power amplifier to implement adaptation step and get final product.
A kind of simulated television transmitter digital improvement method of the present invention when utilizing original simulating transmitting machine power amplifier unit that the simulated television transmitter is carried out digital improvement, is based on that following problem designs:
1, the simulated television transmitter is different with input signal and the rf modulations output signal that digital TV transmitter uses, be respectively the mode of video/audio analog signal and vestigial sideband amplitudemodulation (and frequency modulation), and video/audio digital coding TS traffic spike and modes such as digital QPSK, 16AQM, 64QAM.Therefore, must adopt the digital signal modulator to substitute the analog signal modulator, make digital video/audio TS data flow can insert improved television transmitter and also export the radiofrequency signal that meets Digital TV broadcasting standard for terrestrial;
2, the simulated television transmitter is different in the index of evaluation radio frequency output signal with digital TV transmitter, the simulated television transmitter is non-linear with the differential gain (DG), the differential phase (DP), low frequency, intermodulation indexs such as (IMD) is measured, and digital TV transmitter is then measured with modulation error rate (MER) and band shoulder (Shoulder Distance) etc.Therefore, for making full use of the power amplifier unit of original simulating transmitting machine, the digital signal modulator must possess the function of predistortion correction, and be suitable for the amplification characteristic of the simulating transmitting machine power amplifier unit of need transformation, to proofread and correct the distorted signals that produces owing to power amplifier unit, guarantee that improved television transmitter radio frequency output signal satisfies corresponding index request;
3, the definition of the power measurement of simulated television transmitter is different with the power measurement definition of digital TV transmitter, the peak-to-average power of each transmitter is also more different than (PAPR), utilizes the power amplifier unit (its gain is determined value) of original simulating transmitting machine to obtain the required incoming signal level difference of maximum number output power signal.Therefore, must after digital signal modulator output signal, insert signal and promote level, so that the transmitter power amplifier unit obtains suitable incoming level;
4, adopt the radiofrequency signal distributor of non-broadband band characteristic in the simulated television transmitter power amplifier unit usually, as 3dB electric bridge or little band forms, this type of distributor distributes the difference may cause each road radio frequency phase of output signal and level carrying out multiple signal, and the digital television signal transmitting channel of improved television transmitter with transform before the anolog TV signals transmitting channel possible different.Therefore when utilizing original simulating transmitting machine power amplifier unit, need to adopt the broadband rf signal distributor to substitute the not good radiofrequency signal distributor of broadband performance of original its use, make the radio frequency output signal of distributor guarantee homophase, same level, also make improved television transmitter be fit to the needs of different television signals working channel;
5, the simulated television transmitter is different with the radio-frequency component of the non-expectation of digital TV transmitter generation, the outer non-expectation radiation of the band of simulated television transmitter is a discrete spectrum, and can be divided into adjacent channel and non-adjacent channel, the outer non-expectation radiation of the band of digital TV transmitter is approximate continuous spectrum and harmonic wave.Therefore, the output filter that improved television transmitter radio frequency output is connected may need change former, transforms the quality requirement that the back television transmitter exports the radiofrequency signal of transmitting antenna to satisfy.
6, the monitoring and the guard block of simulating transmitting machine are done suitable choice and adjustment, as removing the no video signal alarm function of simulating transmitting machine, and the starting to control a little of protective circuit such as complete machine overpower.
In order to realize above-mentioned simulated television transmitter digital improvement method, the present invention also proposes a kind of Digital Television excitation amplifying device that is suitable for the simulated television transmitter digital improvement, its digital signal modulator with digital TV transmitter institute adapted is different, except that the basic function that possesses conventional digital signal modulator, also should possess following condition:
1, has broadband rf signal distributor and multi-channel output mouth, output same frequency, same-phase, with the Digital Television radiofrequency signal of level, so that polylith power amplifier module its multi-channel rf output signal is direct and in the simulated television transmitter power amplifier unit that is utilized is connected
2, have the radiofrequency signal driving amplifier, make all exportable enough radiofrequency signal power levels of described multi-channel output mouth, to satisfy power amplifier module in the original simulated television transmitter power amplifier unit that is utilized to the incoming signal level requirement;
3, the radiofrequency signal driving amplifier has the automatic electric-level control loop, makes the signal output level of described multi-channel output mouth can keep constant;
4, the digital signal predistortion correction function that has a kind of technical scheme at least can suitably be proofreaied and correct the nonlinear distortion that the television transmitter power amplifier module produces, and improves the quality of television transmitter radio frequency output signal.
Based on mentality of designing to above-mentioned Digital Television excitation amplifying device, referring to shown in Figure 3, the device of a kind of simulated television transmitter digital improvement of the present invention is included in and is connected a Digital Television between the parts of removing in the power amplifier unit of input video/audio TS data flow and original simulated television transmitter behind the radiofrequency signal distributor and encourages amplifying device; This locality that this Digital Television excitation amplifying device is provided with radiofrequency signal output a 36.1～36.n who is used for the signal input part 31 of input video/audio TS data flow, a plurality of power amplifier unit output multi-channel rf signals to the back-end and is used for carrying out running parameter setting and adjustment is provided with input 37; Excitation includes a digital signal modulator 32, radiofrequency signal driving amplifier 33, automatic level controller 34, radio frequency multichannel homophase distributor 35 and this locality in the amplifying device input 37 is set; The input of digital signal modulator 32 is connected with signal input part 31; The output of digital signal modulator 32 is connected to the input of radiofrequency signal driving amplifier 33, and the output of radiofrequency signal driving amplifier 33 is connected to the input of radio frequency multichannel homophase distributor 35; A plurality of outputs of radio frequency multichannel homophase distributor 35 by multi-channel rf signal output part 36.1～36.n respectively with the power amplifier unit of original simulated television transmitter in remove a plurality of power amplifier modules of the parts behind the radiofrequency signal distributor corresponding being connected of signal input port; The input of automatic level controller 34 is connected to the output of radiofrequency signal driving amplifier 33, and the output of automatic level controller 34 is connected to the control end of radiofrequency signal driving amplifier 33; This locality is provided with input 37 and is connected with the adjustable side of digital signal modulator 32, radiofrequency signal driving amplifier 33 respectively.
Described excitation amplifying device also is provided with remote monitoring interface 38, and this remote monitoring interface 38 is connected with the adjustable side of digital signal modulator 32, radiofrequency signal driving amplifier 33 respectively.
The device of a kind of simulated television transmitter digital improvement of the present invention, the signal input part 31 of Digital Television excitation amplifying device is used for connecting the video/audio TS data flow of input and exports to digital signal modulator 32, digital signal modulator 32 is exported to digital signal driving amplifier 33 with modulated digital video audio frequency low level radiofrequency signal, digital signal driving amplifier 33 carries out radiofrequency signal to output to the multichannel distribution that radio frequency multichannel homophase distributor 35 carries out this radiofrequency signal behind the linear amplification, radio frequency multichannel homophase distributor 35 is exported homophase multi-channel rf signals, and is connected with radiofrequency signal output 36.1～36.n.Encourage the multi-channel rf signal correspondence of amplifying device output to be defeated by in the input port of the parts behind the dismounting radiofrequency signal distributor in the power amplifier unit of original simulated television transmitter by Digital Television, be that correspondence is defeated by the multichannel power amplifier module, power amplifier module exports radio-frequency (RF) power combiner to after the radiofrequency signal of input is amplified, radio-frequency (RF) power combiner outputs to the radio-frequency power output port after then the multi-channel rf signal of importing being synthesized, and the radio-frequency power output port is exported radio-frequency filter again and is connected to antenna-feedback system and carries out the digital television signal broadcast emission.The excitation amplifying device of digital TV transmitter is provided with this locality input 37 and remote monitoring interface 38 is set, this locality is provided with input 37 and is used for connecting local control button, digital signal modulator and radiofrequency signal driving amplifier are carried out running parameter setting and adjustment, remote monitoring interface 38 is used for connecting remote control equipment, and the running parameter of digital signal modulator 32 and radiofrequency signal driving amplifier 33 is carried out remote monitoring and long-range setting.The automatic electric-level control loop is used for the output signal of radiofrequency signal driving amplifier is carried out level detection.
Radio frequency multichannel homophase distributor 35 exportable same frequencys, same-phase, with the Digital Television radiofrequency signal of level, the multi-channel rf signal of its output can be directly be connected with polylith power amplifier module in the simulated television transmitter power amplifier unit that is utilized by radiofrequency signal output 36.1～36.n; Radiofrequency signal driving amplifier 33 makes all exportable enough radiofrequency signal power levels of radiofrequency signal output 36.1～36.n, to satisfy power amplifier module in the original simulated television transmitter power amplifier unit utilized to the incoming signal level requirement; Radiofrequency signal driving amplifier 33 is connected with automatic level controller 34, makes the signal output level of radiofrequency signal output 36.1～36.n can keep constant; This locality is provided with input 37 can connect local control button, and digital signal modulator is carried out running parameter setting and adjustment, and remote monitoring interface 38 can connect remote control equipment, and the running parameter of transmitter is carried out remote monitoring and long-range setting.
Specify an example of modification below in conjunction with Fig. 4.
The objective for implementation of example of modification of the present invention connects radio-frequency filter and antenna-feedback system thereafter for working in the simulated television transmitter of 24 channel 1000W (peak power), need work in 32 channels after the enforcement, and export maximum radio frequency power as far as possible.
The traffic spike that device for carrying out said has possessed to input carries out the rf modulations function, and can export the radiofrequency signal of arbitrary channel in uhf band, and the working channel of present embodiment is 32 channels;
Transmitter after the enforcement is with input digit video/audio TS traffic spike, and the analog signal modulator of the former configuration of objective for implementation need be removed;
Device for carrying out said has possessed radio frequency multichannel homophase distributor, and the radiofrequency signal distributor of the former configuration of objective for implementation need be removed, and keeps its power amplifier unit;
The power amplifier unit of objective for implementation is made of 4 power amplifier modules, the gain of each power amplifier module is about 28dB, through adjusting and test, expectation can obtain 220W (53dBm from the radio-frequency filter output that power amplifier unit connects, digital averaging power) complex RF power, promptly require each power amplifier module need import the radio frequency level that is not less than 23dBm, this device for carrying out said can be exported with frequently simultaneously from 4 radiofrequency signal outputs, homophase, radiofrequency signal with level, maximum signal level is not less than 25dBm, and the output level with 0.1dB is regulated stepping, the adjusting total amount is 16dB, satisfies and implements requirement;
Because the transmission of television working channel difference before and after implementing also need be changed corresponding radio-frequency filter.
As Fig. 4, after removing the analog signal modulator and radiofrequency signal distributor of objective for implementation, device for carrying out said is inserted transmitter framework, with the corresponding connection of power amplifier module input port of radiofrequency signal output port with the objective for implementation power amplifier unit of device for carrying out said, and the power supply and the remote monitoring interface of device carried out necessary connection.
Digital TV transmitter after the enforcement is by the power amplifier unit 42 of digital TV transmitter excitation amplifying device 41, objective for implementation, and the formations of changing such as radio-frequency filter 43, and its signal connection and operation principle block diagram are as shown in Figure 4.
In the present embodiment, the video/audio TS traffic spike of Digital Television inputs to digital signal modulator 412 through digital TV transmitter excitation amplifying device 41 through signal input part 411, this locality control button that input 417 connections are set from this locality is provided with the rf modulations that digital signal modulator 412 carries out 32 channel 16QAM, makes digital signal modulator 412 export the modulated RF signals of 32 channel 0dBm.
The input of the modulated RF signals incoming radio frequency signal driving amplifier 413 of digital signal modulator 412 outputs, and the amplification output of radiofrequency signal driving amplifier 413 and signal controlling end are connected with automatic level controller 414 respectively, make radiofrequency signal driving amplifier 413 amplify output signal level and can keep constant.In the present embodiment, the gain that this locality control button that input 417 connects can radiofrequency signal driving amplifier 413 is set through this locality is set to 31dB, promptly its output signal is about 31dBm.
The radiofrequency signal of radiofrequency signal driving amplifier 413 output is divided into 4 the tunnel with frequencies, homophase, with the radiofrequency signal of level through radio frequency multichannel homophase distributor 415, promptly is output as 32 channels and has the radiofrequency signal of about 23dBm level through radiofrequency signal output 416.1～416.4.
The radiofrequency signal of each radiofrequency signal output 416.1～416.4 output of digital TV transmitter excitation amplifying device 41 is defeated by the input port 421.1～421.4 of power amplifier unit respectively, the radiofrequency signal of input port 421.1～421.4 outputs is defeated by power amplifier module 422.1～422.4 respectively, carry out the amplification of 28dB gain through each power amplifier module 422.1～422.4 after, each is exported 32 channels and has the radiofrequency signal of about 51dBm level.
The radiofrequency signal that power amplifier module 422.1～422.4 amplifies all inserts the radio-frequency (RF) power combiner 423 of power amplifier unit 42, and through the radio-frequency power of the about 55dBm power level of radio-frequency power output port 424 output, this radio-frequency power directly inserts the radio-frequency filter 43 of 32 channels.
Carry out the test case of radio-frequency power and signal quality according to the radio frequency sample signal of obtaining from the radio-frequency filter 43 and the junction of antenna-feedback system, by this locality this locality control button that input 417 connects is set digital signal modulator is carried out careful adjustment such as every running parameters such as gain, level, precorrection, make present embodiment can realize that the MER value of the output of digital TV transmitter 220W radio-frequency power, signal takes on the good result that is better than 36dB greater than 32dB, band.
Present embodiment also can carry out necessary change and adjustment to signal alarm and power detection and protective circuit.
After the digital transmitter operate as normal, can connect, the running parameter of this transmitter is carried out remote monitoring and long-range setting, make its work be in the required optimum state of digital television signal emission by the Long-distance Control that remote monitoring interface 418 connects.
Adopt the enforcement of the digital TV transmitter of even numbers word signal modulator standby configuration, carry out with reference to the present embodiment step after can increasing the modulation switch.
The foregoing description only is used for further specifying a kind of simulated television transmitter digital improvement method of the present invention and device thereof; but the present invention is not limited to embodiment; every foundation technical spirit of the present invention all falls in the protection range of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment did.
Claims (4)
1. a simulated television transmitter digital improvement method is characterized in that: comprise the steps:
The analog signal modulator that A, the original simulated television transmitter of dismounting are equipped with, the Digital Television of packing into excitation amplifying device; This locality that this Digital Television excitation amplifying device is provided with a radiofrequency signal output that is used for the signal input part of input video/audio TS data flow, a plurality of power amplifier unit output multi-channel rf signals to the back-end and is used for carrying out running parameter setting and adjustment is provided with input;
B, remove radiofrequency signal distributor in original simulated television transmitter power amplifier unit, determine the signal input port of a plurality of power amplifier modules of this power amplifier unit;
C, Digital Television is encouraged amplifying device a plurality of radiofrequency signal outputs respectively with a plurality of corresponding being connected of power amplifier module signal input port of this power amplifier unit;
D, determine whether the working channel of the radio frequency output filter that former simulation television transmitter is connected is suitable, if the transmission of television working channel difference before and after implementing then need be changed corresponding radio-frequency filter;
E, this locality control button that input connects is set, the running parameter of Digital Television excitation amplifying device is set, make the radiofrequency signal of output expectation working channel and expectation modulation system, and satisfy the signal level requirement of power amplifier module by this locality;
F, video/audio TS data flow is inserted the signal input part of Digital Television excitation amplifying device, and the output signal of the radio-frequency (RF) power combiner that power amplifier module is connected is carried out the detection of signal quality;
G, according to detection to the index signal output of radio-frequency (RF) power combiner; by this locality this locality control button that input connects is set; running parameter to Digital Television excitation amplifying device is set and is adjusted; comprise setting and adjustment that level, predistortion correction, protective circuit are started to control, make the signal quality that is detected obtain optimum state.
2. a kind of simulated television transmitter digital improvement method according to claim 1, it is characterized in that: further, this simulated television transmitter digital improvement method also is included in the Digital Television excitation amplifying device remote monitoring interface is set, be connected with the control appliance of remote control terminal by this remote monitoring interface, utilize control appliance to carry out the setting and the adjusting of telemonitoring and running parameter thereof.
3. the device of a simulated television transmitter digital improvement is characterized in that: remove in the signal input part that is included in input video/audio TS data flow and the power amplifier unit of original simulated television transmitter and is connected a Digital Television between the parts behind the radiofrequency signal distributor and encourages amplifying device; This locality that this Digital Television excitation amplifying device is provided with a radiofrequency signal output that is used for the signal input part of input video/audio TS data flow, a plurality of power amplifier unit output multi-channel rf signals to the back-end and is used for carrying out running parameter setting and adjustment is provided with input; Excitation includes a digital signal modulator, radiofrequency signal driving amplifier, automatic level controller, radio frequency multichannel homophase distributor and this locality in the amplifying device input is set; The input of digital signal modulator is connected with signal input part; The output of digital signal modulator is connected to the input of radiofrequency signal driving amplifier, and the output of radiofrequency signal driving amplifier is connected to the input of radio frequency multichannel homophase distributor; A plurality of outputs of radio frequency multichannel homophase distributor by the multi-channel rf signal output part respectively with the power amplifier unit of original simulated television transmitter in remove a plurality of power amplifier modules of the parts behind the radiofrequency signal distributor corresponding being connected of signal input port; The input of automatic level controller is connected to the output of radiofrequency signal driving amplifier, and the output of automatic level controller is connected to the control end of radiofrequency signal driving amplifier; This locality is provided with input and is connected with the adjustable side of digital signal modulator, radiofrequency signal driving amplifier respectively.
4. the device of a kind of simulated television transmitter digital improvement according to claim 3, it is characterized in that: described excitation amplifying device also is provided with the remote monitoring interface, and this remote monitoring interface is connected with the adjustable side of digital signal modulator, radiofrequency signal driving amplifier respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010199480 CN102281407B (en) | 2010-06-12 | 2010-06-12 | Method and device for performing digitized reconstruction on analog television transmitter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010199480 CN102281407B (en) | 2010-06-12 | 2010-06-12 | Method and device for performing digitized reconstruction on analog television transmitter |
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| CN102281407A CN102281407A (en) | 2011-12-14 |
| CN102281407B true CN102281407B (en) | 2013-07-31 |
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| CN103457615A (en) * | 2013-08-16 | 2013-12-18 | 奥维通信股份有限公司 | Audio broadcasting frequency modulation transmitter based on digital-analog networking |
| CN113727099A (en) * | 2021-11-01 | 2021-11-30 | 成都华乾科技有限公司 | Transmitter-based intelligent health analysis and diagnosis method and system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6272147B1 (en) * | 1996-09-27 | 2001-08-07 | Hewlett-Packard Company | Method and apparatus for prioritized transmission of data over a network |
| CN1921576A (en) * | 2006-06-17 | 2007-02-28 | 成都新光微波工程有限责任公司 | Activator for digital-analog compatible television transmitter |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6272147B1 (en) * | 1996-09-27 | 2001-08-07 | Hewlett-Packard Company | Method and apparatus for prioritized transmission of data over a network |
| CN1921576A (en) * | 2006-06-17 | 2007-02-28 | 成都新光微波工程有限责任公司 | Activator for digital-analog compatible television transmitter |
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| CN102281407A (en) | 2011-12-14 |
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