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CN201274529Y - Frequency selecting and converting forwarding device for digital television - Google Patents

Frequency selecting and converting forwarding device for digital television Download PDF

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Publication number
CN201274529Y
CN201274529Y CNU2008201455023U CN200820145502U CN201274529Y CN 201274529 Y CN201274529 Y CN 201274529Y CN U2008201455023 U CNU2008201455023 U CN U2008201455023U CN 200820145502 U CN200820145502 U CN 200820145502U CN 201274529 Y CN201274529 Y CN 201274529Y
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frequency
local oscillator
signal
selective
conversion mixer
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康文彪
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Fujian Sunnada Communication Co Ltd
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Fujian Sunnada Communication Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

一种数字电视选频变频转发器，其中施主天线接收空中无线弱信号后经过一前级滤波器进行滤波，滤波后经过一低噪声放大器将信号放大，通过一选频变频器选择输入信号的频率并将其变频到所需转发的频率，再通过一功率放大器将其进行放大输出，经过一后级滤波器滤波后通过重发天线向所需覆盖区域进行无线覆盖。该数字电视选频变频转发器还包括一智能监控系统对选频变频器进行输入和输出频点设置以及通道的选择控制。通过该数字电视选频变频转发器，不仅能够降低隔离度对设备的限制，而且通过对选频通道的控制，有效地将需要的频点信号进行放大，同时又消除了频点与频点之间无用信号的干扰，控制方便、灵活，非常适用于频点变化较大的地区。

Figure 200820145502

A digital TV frequency-selective variable-frequency transponder, in which the donor antenna receives a weak wireless signal in the air and filters it through a pre-stage filter, after filtering, the signal is amplified by a low-noise amplifier, and the frequency of the input signal is selected by a frequency-selective converter And convert it to the frequency that needs to be forwarded, and then amplify and output it through a power amplifier. After filtering through a post-stage filter, wireless coverage is carried out to the required coverage area through the retransmission antenna. The digital TV frequency selection frequency conversion transponder also includes an intelligent monitoring system to set the input and output frequency points of the frequency selection frequency converter and control channel selection. Through the digital TV frequency-selective transponder, it can not only reduce the limitation of isolation on the equipment, but also effectively amplify the required frequency signal through the control of the frequency-selection channel, and at the same time eliminate the difference between the frequency point and the frequency point. It is easy to control and flexible to control the interference of unwanted signals, and is very suitable for areas with large frequency changes.

Figure 200820145502

Description

Digital Television frequency-selecting frequency translating transponder
Technical field
The utility model relates to a kind of transponder, refers to a kind of Digital Television transponder especially and is applied to the frequency-selecting frequency translating transponder of this Digital Television.
Background technology
Along with the continuous upgrading and the development of information industry technology, the development of terrestrial DTV gets most of the attention.At present, the ground digital television signal in most of area all adopts high-power transmitter to carry out wireless coverage, but some outlying district is owing to be subjected to restriction such as geographical conditions, and signal can't be finished covering, and therefore the forwarding unit that adopts relaying to amplify carries out wireless coverage to these areas.
The forwarding unit of general wireless receiving as shown in Figure 1, is all taken from the space coupled signal, and is with frequently, so its working gain is subjected to the restriction of receiving terminal and transmitting terminal isolation between antennas, in case isolation is not enough, just causes the equipment self-excitation easily.
On the one hand, guarantee that self-excitation does not take place common-frequency repeater, common way is the isolation between antennas that improves between transponder receiving terminal and the transmitting terminal.In fact, during using, plant engineering is subjected to the restriction of various environmental factors, wanting to improve the experience that its situation relies on the engineering staff basically goes to judge, even the costliness of carrying and heavy tester are tested to the scene, the data of test also only are that state is constantly installed in reaction, environment is on every side but constantly changing, and the stability of isolation can't guarantee just than the self-excitation that is easier to cause equipment.
On the other hand, the frequency that transmit in some area is not fixed, and is not that a plurality of continuous frequencies are transmitted, but the interval of one or more frequencies is arranged between frequency and the frequency.If adopt the broadband with transmitting frequently, easily unwanted frequency is amplified, can carry out interference to useful signal simultaneously, influence the quality that terminal receives.
The utility model content
Based on foregoing, be necessary to provide a kind of Digital Television frequency-selecting frequency translating transponder, it not only can reduce the restriction of on-the-spot isolation to equipment, and the unwanted signal that also can eliminate between frequency and the frequency disturbs.
This Digital Television frequency-selecting frequency translating transponder comprises a donor antenna, a prime filter, a low noise amplifier, an intelligent monitor system, a modulator-demodulator, a power amplifier, a back grade filter, a retransmitting antenna, a frequency-selecting frequency converter and a power-supply system.Donor antenna carries out filtering through the prime filter after receiving the on-air radio weak signal, through low noise amplifier signal is amplified after the filtering, select the frequency of input signal and it is converted to the frequency of required forwarding by the frequency-selecting frequency converter, by power amplifier it is carried out with amplifying output frequently, through carrying out wireless coverage by retransmitting antenna to required overlay area behind the level filter filtering later again.Wherein, intelligent monitor system is inquired about and is controlled the operating state of low noise amplifier and power amplifier, the frequency-selecting frequency converter is carried out the selection control of input and output frequency point setting and passage.Power-supply system is that in the transponder each has source module to power.
This is used for the frequency-selecting frequency converter of Digital Television frequency-selecting frequency translating transponder, and it comprises a multi-path power divider, a multi-circuit combiner, a control circuit, at least two communication ports and at least two power switch circuits.Wherein, the corresponding communication port of each power switch circuit is used to control the unlatching of corresponding communication port or close.Multi-path power divider is used for that radiofrequency signal is divided into the multi-channel rf signal and delivers to described communication port.This communication port comprises a down-conversion mixer, one first local oscillator, an intermediate-frequency filter, one second local oscillator and a up-conversion mixer.This first local oscillator produces first local oscillation signal and delivers to the down-conversion mixer of connection.The intermediate-frequency filter that this down-conversion mixer carries out radiofrequency signal and first local oscillation signal to become intermediate-freuqncy signal under the mixing and delivers to connection.This intermediate-frequency filter intermediate-freuqncy signal is carried out Filtering Processing and will handle after intermediate-freuqncy signal deliver to the up-conversion mixer of connection.This second local oscillator produces second local oscillation signal and delivers to the up-conversion mixer of connection.This up-conversion mixing carries out becoming in the mixing frequency signal that meets the transmission need and the multi-circuit combiner of delivering to connection with the filtered intermediate-freuqncy signal and second local oscillation signal.This multi-circuit combiner will synthesize and export to a power amplifier from the signal that described communication port produces.This control circuit links to each other with described power switch circuit, first local oscillator and second local oscillator, controls the local oscillation signal that first local oscillator and second local oscillator produce corresponding frequencies, and corresponding communication port is opened or closed to the control power switch circuit.
Compared to prior art, this Digital Television frequency-selecting frequency translating transponder, not only can reduce the restriction of isolation to equipment, and by control to the frequency-selecting passage, frequency signal with needs amplifies effectively, eliminated simultaneously the interference of unwanted signal between frequency and the frequency again, control is convenient, flexible, is highly suitable for frequency variation area greatly.
Description of drawings
Fig. 1 is the hardware structure figure of existing Digital Television common-frequency repeater.
Fig. 2 is the hardware structure figure of the utility model Digital Television frequency-selecting frequency translating transponder in an execution mode.
Fig. 3 is the hardware structure figure of frequency-selecting frequency converter in an execution mode among Fig. 2.
Fig. 4 is the hardware structure figure of communication port in an execution mode among Fig. 3.
Fig. 5 is the hardware structure figure that the frequency-selecting frequency converter adopts one or four frequency-selecting frequency converters among Fig. 2 in an execution mode.
Embodiment
As shown in Figure 2, be the hardware structure figure of the utility model Digital Television frequency-selecting frequency translating transponder in an execution mode.This Digital Television frequency-selecting frequency translating transponder comprises a donor antenna 10, a prime filter 11, a low noise amplifier 12, an intelligent monitor system 13, a modulator-demodulator 14, a power amplifier 15, a back grade filter 16, a retransmitting antenna 17, a frequency-selecting frequency converter 18, a local oscillator 19 and a power-supply system 20.
Wherein, the output of donor antenna 10 is connected to the input of prime filter 11, the output of prime filter 11 is connected to the input of low noise amplifier 12, the output of low noise amplifier 12 is connected to the input of frequency-selecting frequency converter 18, the output of frequency-selecting frequency converter 18 is connected to the input of power amplifier 15, the output of power amplifier 15 is connected to the input of back level filter 16, and the output of back level filter 16 is connected to retransmitting antenna 17.
After receiving the on-air radio weak signal, donor antenna 10 carries out filtering through prime filter 11, through low noise amplifier 12 signal is amplified after the filtering, select the frequency of input signal and it is converted to the frequency of required forwarding by frequency-selecting frequency converter 18, by power amplifier 15 it is amplified output again, through carrying out wireless coverage by retransmitting antenna 17 to required overlay area after 16 filtering of level filter later.Wherein, intelligent monitor system 13 links to each other with low noise amplifier 12, power amplifier 15 and frequency-selecting frequency converter 18, operating state to low noise amplifier 12 and power amplifier 15 is inquired about and is controlled, and frequency-selecting frequency converter 18 is carried out the selection control of input and output frequency point setting and passage.This intelligent monitor system 13 also links to each other with modulator-demodulator 14, carries out the transmitting-receiving of note with it.Each has source module to power to power-supply system 20 in the transponder.
In the present embodiment, this low noise amplifier 12 is one to have that input power detects and the low noise amplifier of automatic electric-level control, and this power amplifier 15 is one to have the power amplifier that power output detects and automatic electric-level is controlled.
Local oscillator 19 links to each other with frequency-selecting frequency converter 18, for this frequency-selecting frequency converter 18 provides an outside local oscillation signal.In the present embodiment, this local oscillator 19 provides a 10MHz outside local oscillation signal for frequency-selecting frequency converter 18.
This frequency-selecting frequency converter 18 has the function of controllable channel switch, can realize that single frequency point arrives the frequency-selecting of a plurality of frequencies.This frequency-selecting frequency converter 18, as shown in Figure 3, comprise a multi-path power divider 180, a plurality of communication port 181 (181a, 181b ... 181n) a plurality of power switch circuits 182 (182a, 182b ... 182n), a control circuit 183 and a multi-circuit combiner 184.Wherein, each power switch circuit 182 corresponding communication port 181 is used to control the unlatching of corresponding communication port 181 or close.These multi-path power divider 180 inputs connect low noise amplifier 12, are used for the radiofrequency signal from this low noise amplifier 12 is divided into the multi-channel rf signal and delivers to communication port 181.
Communication port 181 as shown in Figure 4, comprises a down-conversion mixer 30, an intermediate-frequency filter 31, local oscillator 32, local oscillator 33 and a up-conversion mixer 34.Wherein, the input of intermediate-frequency filter 31 links to each other with down-conversion mixer 30, and output links to each other with up-conversion mixer 34.Local oscillator 32 links to each other with down-conversion mixer 30, is used to produce first local oscillation signal and delivers to this down-conversion mixer 30.Local oscillator 33 links to each other with up-conversion mixer 34, is used to produce second local oscillation signal and delivers to this up-conversion mixer 34.The input of this down-conversion mixer 30 links to each other with multi-path power divider 180 and local oscillator 32, and output links to each other with intermediate-frequency filter 31.This down-conversion mixer 30 is used for and will carries out mixing from the radiofrequency signal of this multi-path power divider 180 and first local oscillation signal of local oscillator 32, the following intermediate-frequency filter 31 that becomes intermediate-freuqncy signal and deliver to connection.This intermediate-frequency filter 31, in the present embodiment, be one to have the intermediate-frequency filter of special bandwidth, this intermediate-freuqncy signal is carried out Filtering Processing, other spurious signal of filtering is also selected the channel information of required frequency conversion, be required intermediate-freuqncy signal, the intermediate-freuqncy signal after this processing is delivered to up-conversion mixer 34.This up-conversion mixer carries out mixing with the filtered intermediate-freuqncy signal and second local oscillation signal, on change to the frequency signal that meets the transmission needs, and deliver to the multi-circuit combiner 34 of connection.
This multi-circuit combiner 184 is used for the signal from communication channel 181 (being up-conversion mixer 34) being synthesized and exporting to power amplifier 15.This control circuit 183 links to each other with described power switch circuit 182, local oscillator 32 and local oscillator 33, be used to control the local oscillation signal of local oscillator 32 and local oscillator 33 generation corresponding frequencies, and corresponding communication port 181 is opened or closed to control power switch circuit 182.
As shown in Figure 5, be the hardware structure figure that frequency-selecting frequency converter 18 adopts one or four frequency-selecting frequency converters among Fig. 2 in an execution mode.In this execution mode, this multi-path power divider 180 is one four road power splitter; Communication port 181 comprises communication port 181a, communication port 181b, communication port 181c and communication port 181d; Power switch circuit 182 comprises power switch circuit 182a, power switch circuit 182b, power switch circuit 182c and power switch circuit 182d; Multi-circuit combiner 184 is one four road mixer; Control circuit 183 is a cpu control circuit.
The incoming frequency of this four frequency-selectings frequency converter and output frequency can be provided with corresponding frequency by intelligent monitor system 13 and realize.For example, suppose that the input frequency is 13,15,17,19, the output frequency is 41,43,45,47.When certain area needs only two frequencies of transmission, then can produce control corresponding and instruct, make it close two communication ports 181 wherein and the corresponding frequency of frequency in and out that other two passages are set gets final product to cpu control circuit 183 by intelligent monitor system 13.By that analogy, the Digital Television frequency-selecting frequency translating transponder of one or four frequency conversions of frequency-selecting frequently can be controlled the frequency-selecting that realizes single frequency point to four frequency by passage and transmit, and control is convenient, flexible.
The Digital Television frequency-selecting frequency translating transponder and the frequency-selecting frequency converter 18 that provide by the utility model, after it carries out Filtering Processing with the ground digital television signal that receives, carry out frequency-selecting and passage control by the frequency of 13 pairs of required forwardings of intelligent monitor system, transforming to intermediate frequency is converted to another frequency and signal is amplified covers behind intermediate frequency filtering, the user directly receives the signal after the frequency conversion, reduced on-the-spot insulated degree requirement, and can multistage relay, effectively enlarge the coverage of terrestrial DTV emission system, improve the weak signal area error rate, improve the quality of reception, networking flexibility, networking is rapid, save networking costs such as machine room, reach the degree of depth and cover.

Claims (8)

1.一种数字电视选频变频转发器，包括一施主天线、一前级滤波器、一低噪声放大器、一智能监控系统、一调制解调器、一功率放大器、一后级滤波器及一重发天线，其特征在于：1. A frequency-selective variable-frequency transponder for digital television, comprising a donor antenna, a pre-stage filter, a low-noise amplifier, an intelligent monitoring system, a modem, a power amplifier, a post-stage filter and a retransmission antenna , characterized by: 该转发器所包括的一选频变频器，其与低噪声放大器、智能监控系统及功率放大器相连，该选频变频器包括：A frequency-selective frequency converter included in the transponder is connected with a low-noise amplifier, an intelligent monitoring system and a power amplifier. The frequency-selective frequency converter includes: 一多路功分器；A multiplexer; 一多路合路器；a multiplexer; 一控制电路；a control circuit; 至少两通信通道；及at least two communication channels; and 至少两电源开关电路，每一电源开关电路对应一通信通道，用于控制对应通信通道的开启或关闭；At least two power switch circuits, each power switch circuit corresponds to a communication channel, and is used to control the opening or closing of the corresponding communication channel; 其中，该多路功分器与低噪声放大器相连，用于将来自低噪声放大器的射频信号分为多路射频信号送至所述通信通道；Wherein, the multi-channel power divider is connected to the low-noise amplifier, and is used to divide the radio-frequency signal from the low-noise amplifier into multiple radio-frequency signals and send them to the communication channel; 该通信通道包括一下变频混频器、一第一本振、一中频滤波器、一第二本振及一上变频混频器；The communication channel includes a down-conversion mixer, a first local oscillator, an intermediate frequency filter, a second local oscillator and an up-conversion mixer; 其中，该第一本振用于产生第一本振信号并送至连接的下变频混频器；Wherein, the first local oscillator is used to generate the first local oscillator signal and send it to the connected down-conversion mixer; 该下变频混频器用于将射频信号及第一本振信号进行混频下变成中频信号并送至连接的中频滤波器；The down-conversion mixer is used to mix the radio frequency signal and the first local oscillator signal to down-convert the intermediate frequency signal and send it to the connected intermediate frequency filter; 该中频滤波器用于将中频信号进行滤波处理并将处理后的中频信号送至连接的上变频混频器；The intermediate frequency filter is used to filter the intermediate frequency signal and send the processed intermediate frequency signal to the connected up-conversion mixer; 该第二本振用于产生第二本振信号并送至连接的上变频混频器；The second local oscillator is used to generate a second local oscillator signal and send it to the connected up-conversion mixer; 该上变频混频器用于将滤波后的中频信号及第二本振信号进行混频上变成符合传输需要的频率信号并送至连接的多路合路器；The up-conversion mixer is used to mix the filtered intermediate frequency signal and the second local oscillator signal into a frequency signal that meets the transmission requirements and send it to the connected multiplexer; 该多路合路器用于将来自所述通信通道产生的信号进行合成并输出至功率放大器；The multiplexer is used to synthesize the signals generated from the communication channels and output them to the power amplifier; 该控制电路与智能监控系统、电源开关电路、第一本振及第二本振相连，用于根据智能监控系统的信号，控制第一本振及第二本振产生相应频率的本振信号，并控制电源开关电路开启或关闭对应的通信通道。The control circuit is connected with the intelligent monitoring system, the power switch circuit, the first local oscillator and the second local oscillator, and is used to control the first local oscillator and the second local oscillator to generate local oscillator signals of corresponding frequencies according to the signals of the intelligent monitoring system. And control the power switch circuit to open or close the corresponding communication channel. 2.如权利要求1所述的数字电视选频变频转发器，其特征在于，所述多路功分器为一四路功分器，用于将射频信号分为四路射频信号，每一路射频信号对应一通信通道。2. digital television frequency-selective variable-frequency transponder as claimed in claim 1, is characterized in that, described multi-way power splitter is a four-way power splitter, is used for radio frequency signal is divided into four road radio frequency signals, each road The radio frequency signal corresponds to a communication channel. 3.如权利要求1所述的数字电视选频变频转发器，其特征在于，所述控制电路为一CPU控制电路。3. The frequency-selective transponder for digital television as claimed in claim 1, wherein the control circuit is a CPU control circuit. 4.如权利要求1所述的数字电视选频变频转发器，其特征在于，还包括一第三本振，其于所述选频变频器相连，用于产生一外部本振信号至该选频变频器。4. The frequency-selective transponder for digital television as claimed in claim 1, further comprising a third local oscillator, which is connected to the frequency-selective converter for generating an external local oscillator signal to the selected frequency converter. frequency converter. 6.如权利要求1所述的数字电视选频变频转发器，其特征在于，所述低噪声放大器为一具有输入功率检测和自动电平控制的低噪声放大器，所述功率放大器为一具有输出功率检测和自动电平控制的功率放大器。6. digital television frequency-selective variable-frequency transponder as claimed in claim 1, is characterized in that, described low-noise amplifier is a low-noise amplifier with input power detection and automatic level control, and described power amplifier is a with output Power amplifier with power detection and automatic level control. 7.一种用于数字电视选频变频转发器的选频变频器，其特征在于，该选频变频器包括：7. A frequency-selective frequency converter for digital television frequency-selective frequency conversion transponders, characterized in that, the frequency-selective frequency converter comprises: 一多路功分器；A multiplexer; 一多路合路器；a multiplexer; 一控制电路；a control circuit; 至少两通信通道；及at least two communication channels; and 至少两电源开关电路，每一电源开关电路对应一通信通道，用于控制对应通信通道的开启或关闭；At least two power switch circuits, each power switch circuit corresponds to a communication channel, and is used to control the opening or closing of the corresponding communication channel; 其中，该多路功分器用于将射频信号分为多路射频信号送至所述通信通道；Wherein, the multi-channel power divider is used to divide the radio frequency signal into multiple radio frequency signals and send them to the communication channel; 该通信通道包括一下变频混频器、一第一本振、一中频滤波器、一第二本振及一上变频混频器；The communication channel includes a down-conversion mixer, a first local oscillator, an intermediate frequency filter, a second local oscillator and an up-conversion mixer; 其中，该第一本振用于产生第一本振信号并送至连接的下变频混频器；Wherein, the first local oscillator is used to generate the first local oscillator signal and send it to the connected down-conversion mixer; 该下变频混频器用于将射频信号及第一本振信号进行混频下变成中频信号并送至连接的中频滤波器；The down-conversion mixer is used to mix the radio frequency signal and the first local oscillator signal to down-convert the intermediate frequency signal and send it to the connected intermediate frequency filter; 该中频滤波器用于将中频信号进行滤波处理并将处理后的中频信号送至连接的上变频混频器；The intermediate frequency filter is used to filter the intermediate frequency signal and send the processed intermediate frequency signal to the connected up-conversion mixer; 该第二本振用于产生第二本振信号并送至连接的上变频混频器；The second local oscillator is used to generate a second local oscillator signal and send it to the connected up-conversion mixer; 该上变频混频器用于将滤波后的中频信号及第二本振信号进行混频上变成符合传输需的频率信号并送至连接的多路合路器；The up-conversion mixer is used to mix the filtered intermediate frequency signal and the second local oscillator signal into a frequency signal that meets the transmission requirements and send it to the connected multiplexer; 该多路合路器用于将来所述通信通道产生的信号进行合成并输出至一功率放大器；The multiplexer is used to synthesize the signals generated by the communication channel in the future and output them to a power amplifier; 该控制电路与所述电源开关电路、第一本振及第二本振相连，用于控制第一本振及第二本振产生相应频率的本振信号，并控制电源开关电路开启或关闭对应的通信通道。The control circuit is connected with the power switch circuit, the first local oscillator and the second local oscillator, and is used to control the first local oscillator and the second local oscillator to generate local oscillator signals of corresponding frequencies, and control the power switch circuit to turn on or off the corresponding communication channel. 8.如权利要求7所述的选频变频器，其特征在于，所述控制电路为一CPU控制电路。8. The frequency-selective inverter according to claim 7, wherein the control circuit is a CPU control circuit. 9.一种数字电视选频变频转发器，包括一施主天线、一前级滤波器、一低噪声放大器、一智能监控系统、一调制解调器、一功率放大器、一后级滤波器、一电源系统及一重发天线，其特征在于：9. A frequency-selective transponder for digital television, comprising a donor antenna, a pre-stage filter, a low-noise amplifier, an intelligent monitoring system, a modem, a power amplifier, a post-stage filter, a power supply system and A repeating antenna, characterized in that: 该转发器还包括一选频变频器，其与低噪声放大器、智能监控系统及功率放大器相连，用于选择输入信号的频率并将其变频到所需转发的频率；The transponder also includes a frequency-selective frequency converter, which is connected with the low-noise amplifier, the intelligent monitoring system and the power amplifier, and is used to select the frequency of the input signal and convert it to the frequency to be transmitted; 该智能监控系统控制该选频变频器进行输入和输出频点设置以及通道的选择控制。The intelligent monitoring system controls the frequency selection frequency converter to set input and output frequency points and control channel selection.
CNU2008201455023U 2008-09-11 2008-09-11 Frequency selecting and converting forwarding device for digital television Expired - Fee Related CN201274529Y (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101835004B (en) * 2009-12-08 2012-09-19 三维通信股份有限公司 Frequency agility system for co-frequency forwarding of digital television
CN103018724A (en) * 2011-09-21 2013-04-03 中国科学院电子学研究所 Active transponder for broadband
CN104333737A (en) * 2014-10-28 2015-02-04 北京大学软件与微电子学院无锡产学研合作教育基地 Near-distance 2-5 M bandwidth simulative wireless picture transmission system and signal processing method
CN104580955A (en) * 2013-10-11 2015-04-29 北京同方吉兆科技有限公司 Multi-channel terrestrial digital television gap filler
CN104868928A (en) * 2014-02-24 2015-08-26 沈阳中科奥维科技股份有限公司 Frequency selection device and method based on WIA-PA protocols
CN106792137A (en) * 2016-12-06 2017-05-31 北京四达时代软件技术股份有限公司 Set Top Box radio frequency modulation processing method and device
CN108880657A (en) * 2018-06-19 2018-11-23 中国人民解放军战略支援部队航天工程大学 A kind of frequency translating transponder for detecing technology based on skill in space base relayed communications enhancing system
CN109461298A (en) * 2018-12-10 2019-03-12 上海无线电设备研究所 A kind of untetheredization group-net communication machine in spacecraft
CN110635666A (en) * 2018-06-20 2019-12-31 Abb瑞士股份有限公司 Frequency converter and method relating to a frequency converter

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101835004B (en) * 2009-12-08 2012-09-19 三维通信股份有限公司 Frequency agility system for co-frequency forwarding of digital television
CN103018724A (en) * 2011-09-21 2013-04-03 中国科学院电子学研究所 Active transponder for broadband
CN103018724B (en) * 2011-09-21 2014-09-17 中国科学院电子学研究所 Active transponder for broadband
CN104580955A (en) * 2013-10-11 2015-04-29 北京同方吉兆科技有限公司 Multi-channel terrestrial digital television gap filler
CN104868928B (en) * 2014-02-24 2018-01-02 沈阳中科奥维科技股份有限公司 A kind of frequency selective device and method based on WIA PA agreements
CN104868928A (en) * 2014-02-24 2015-08-26 沈阳中科奥维科技股份有限公司 Frequency selection device and method based on WIA-PA protocols
CN104333737A (en) * 2014-10-28 2015-02-04 北京大学软件与微电子学院无锡产学研合作教育基地 Near-distance 2-5 M bandwidth simulative wireless picture transmission system and signal processing method
CN106792137A (en) * 2016-12-06 2017-05-31 北京四达时代软件技术股份有限公司 Set Top Box radio frequency modulation processing method and device
CN106792137B (en) * 2016-12-06 2020-06-26 北京四达时代软件技术股份有限公司 Set-top box radio frequency RF modulation processing method and device
CN108880657A (en) * 2018-06-19 2018-11-23 中国人民解放军战略支援部队航天工程大学 A kind of frequency translating transponder for detecing technology based on skill in space base relayed communications enhancing system
CN108880657B (en) * 2018-06-19 2021-05-07 中国人民解放军战略支援部队航天工程大学 Frequency conversion forwarding device based on technology detection technology in air-based relay communication enhancement system
CN110635666A (en) * 2018-06-20 2019-12-31 Abb瑞士股份有限公司 Frequency converter and method relating to a frequency converter
CN110635666B (en) * 2018-06-20 2022-03-29 Abb瑞士股份有限公司 Frequency converter and method relating to a frequency converter
CN109461298A (en) * 2018-12-10 2019-03-12 上海无线电设备研究所 A kind of untetheredization group-net communication machine in spacecraft

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