CN105791812A - Digital television transmitter broadband detection implementation system and method - Google Patents
Digital television transmitter broadband detection implementation system and method Download PDFInfo
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- CN105791812A CN105791812A CN201410812742.4A CN201410812742A CN105791812A CN 105791812 A CN105791812 A CN 105791812A CN 201410812742 A CN201410812742 A CN 201410812742A CN 105791812 A CN105791812 A CN 105791812A
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Abstract
The invention provides a digital television transmitter broadband detection implementation system and method, and relates to a broadcasting transmission field. The digital television transmitter broadband detection implementation system comprises a radio-frequency digital-control attenuator, a radio frequency power detector, an operational amplifier, an analog-to-digital converter, a micro-processor and a micro-controller, wherein the micro-processor is connected with the micro-controller through a parallel data line or 12C bus in an FPGA mode, thereby obtaining calibration data; the micro-controller transmits data in an RS458 multi-computer communication or broadcasting mode. According to the digital television transmitter broadband detection implementation system and method, in a hardware and software combination mode, accuracy of broadband detection can be largely improved, errors of the broadband detection are reduced, and finally an excellent effect of transmitter control stability is implemented.
Description
Technical field
The present invention relates to broadcast transmission field, relate to the broadband detector of a kind of digital TV transmitter, be namely applied to the radio frequency detector of digital TV transmitter, this cymoscope can meet the radio frequency detector of 13CH-48CH, power indicating range 0W-5000W.Can ensure within above-mentioned two scope, the linear and accuracy of detection.
Background technology
In all solid state digital TV transmitter, the radio frequency detector of transmitter is related to the stability of the man-machine interaction of transmitter, control and transmitter.The detection of conventional transmitter is by detection diode or detection chip, radio frequency to be changed into DC voltage to be directly sent to master control and display and control, but owing to the broadband character of transmitter directional coupler is undesirable, or the broadband character of detection diode and detection chip is undesirable, bring many problems often to the broadband character of transmitter, transmitter is caused to control instability, it is impossible to meet the application of 13CH-48CH.For the mode that this problem employing software compensates, to make up the deficiency due to device, the inaccuracy of the broadband demodulation caused.
Summary of the invention
Problem to be solved by this invention is, the cymoscope within transmitter is the problem of accuracy and the linearity in the frequency band range of 13CH-48CH.
In order to reach foregoing invention purpose, technical scheme realizes as follows:
The present invention adopts by simplifying radio-frequency power demodulation system, the design mode that compensates of calibration software is modified by radiofrequency power detector detection DC voltage out, realize detection linear gauging, reach good alignment effect, it is thus achieved that the Stability and veracity of data.
First radiofrequency signal through radio frequency attenuator laggard enter radiofrequency power detector, radiofrequency signal is changed into DC voltage by radiofrequency power detector, this DC voltage is sent into analog-digital converter by operational amplifier and is sampled, data after sampling are fed to microprocessor and process, then, by microcontroller, the main control unit that the voltage after the data of process and transformation is sent to transmitter is displayed and controls.
Wherein it is sent to the data of microprocessor by radio frequency detector device, is calibrated with the power source of standard in 13CH-48CH and power linear in frequency domain respectively by software, simulates the compensating curve of 13CH-48CH, 0W-5000W respectively.
When digital transmitter is applied, transmitter and cymoscope carry out communication by connection, the frequency of work at present is informed radiofrequency power detector by transmitter, radiofrequency power detector takes out accordingly and obtains compensating curve corresponding to current frequency, so just meets the transmitter linearity when broadband demodulation and accuracy.
Meanwhile, the present invention adopts a kind of DTV broadband demodulation calibration to realize method, and the method includes:
Radiofrequency power detector processes radiofrequency signal and converts analog voltage to；
This analog voltage is sent into analog-digital converter and is carried out data sampling by operational amplifier；
Analog-digital converter sends microprocessor to after processing data to be sampled；
The data of microprocessor processes sampling, adopt power linear scope and the frequency response range of calibration module calibration radiofrequency power detector, it is thus achieved that calibration data；
This calibration data is fed back to radiofrequency power detector by microprocessor；
Radiofrequency power detector obtains corresponding compensating curve；
Wherein said calibration module is,
Determine RF power level information, and send the information to radiofrequency power detector；
After radiofrequency power detector receives this information, send detecting circuit value；
Radiofrequency power detector carries out Data correction after detecting this detecting circuit value；
After Data correction, information is shown and inquiry；
By implementing the present invention, take the mode that hardware and software combines, it is possible to the accuracy of broadband demodulation is greatly improved, reduce broadband demodulation error, finally realize the good result of transmitter control stability.
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Accompanying drawing explanation
Fig. 1 is broadband detector testing circuit of the present invention work block diagram；
Fig. 2 is broadband detector microprocessor work schematic diagram of the present invention；
Fig. 3 is that broadband detector detection of the present invention calibration realizes method displaying figure；
Fig. 4 is the flow chart that broadband detector detection of the present invention realizes method.
Detailed description of the invention
According to above-mentioned principle, the radiofrequency power detector of ground digital TV transmitter is designed, by hardware designs, then writes corresponding software, be fabricated to digital TV transmitter broadband demodulation system, it is achieved detection calibration steps.
Such as Fig. 1, this hardware plan radiofrequency signal, after radio frequency attenuator, after radio frequency detector device, it is converted into analog voltage, analog voltage is linear within the specific limits with input signal power logarithm.Operational amplifier utilizes the input range that detecting circuit is raised to the permission of digital to analog converter operational amplifier from the reference voltage of analog-digital converter output.Analog-digital converter has four tunnel inputs and is respectively used to the voltage signal of translation operation amplifier output.Digital signal after analog-digital converter is changed is admitted to MPU FPGA, converts digital signals into the log power of input analogue signal in MPU FPGA, through antilogarithm computing and average after obtain actual power value.The performance number calculated is sent by last MPU FPGA in the way of digital signal.The all on-off model relevant to warning being previously mentioned in demand all can be provided by MPU FPGA.Clock signal in MPU FPGA sequential logic is provided by microcontroller.
Such as Fig. 2, analog-digital converter needs to do configuration work, uses MPU FPGA as configuration source, in order to revise analog-digital converter configuration parameter, therefore scheme retains microcontroller and configures system as analog-digital converter, be conducive to simplifying MPU FPGA programming.Meanwhile, undertake by microcontroller at the external communication interface of power detecting system.Four circuit-switched data after process are first reached microcontroller from I2C bus or parallel data bus line by MPU FPGA, in the way of RS458 multi-computer communication or broadcast, subordinate's circuit it is delivered to again by microcontroller, so, communication protocol is conducive to be revised flexibly.The another one serial ports of microcontroller is for communicating with the RS232 between PC, and the Main Function of this passage is that systematic parameter is measured in amendment.
Such as Fig. 3, a kind of DTV broadband demodulation calibration realizes method, is divided into four functional modules；First, first functional module is for transmit power value information.User inputs the power grade of transmitter at " rated power " window, and after pressing ACK button, the scope of the axis of ordinates value in the Drawing zone of software lower left is shown as " the 0-1.1 times of rated power inputted ", and abscissa remains unchanged, scope " 0-1023 ".
Second functional module receives magnitude of voltage information for calibration software.Three labels of top are made for selecting in drawing interval, current power calibration curve that power sensor port corresponding.After a label is selected, calibration software should send " FWD ", " RFL " or " BAL " instruction to radiofrequency power detector, inform radiofrequency power detector, which detection port is calibrated by active user, and radiofrequency power detector sends the detecting circuit value of corresponding port according to this information to calibration software.
3rd functional module is calibration information.Include three buttons: " starting calibration ", " terminating calibration ", " passing form down ".After calibration procedure starts, only user presses " start calibration " button, and after receiving " SUCCESSE " that radiofrequency power detector returns, other function just can open (sending " ADJ_ON " order), and it is invalid otherwise to arrange.Button is used for cutting out calibration process (sending " ADJ_OFF " order) " to terminate calibration ", and normal condition is receivable " SUCCESS " instruction returned to radiofrequency power detector also.After user adjusts complete calibration of power curve, press " passing form down " button, send " SEND_DATA_F ", " SEND_DATA_R " or " SEND_DATA_B " instruction according to the power curve kind that current label item shows.After radiofrequency power detector returns " REC_RDY ", the 1024 of formation curve ordinate values (, without symbol short, high byte is front for 16bit) are passed sequentially through serial ports transmission and put detection plate by calibration software.
4th functional module is exhibition information.As shown in the figure, (the detecting circuit value that this window shows is that PC is regularly to cymoscope Query Value to " detecting circuit " display window, call " CALL_V_H " and " CALL_V_L " instruction when inquiring about every time), for displaying to the user that detecting circuit on current radio frequency power detector；" interpolation calibration point " button, confirms to add on the transverse axis of display interface calibration point under current detecting circuit, and now user can drag calibration point up and down, and its vertical coordinate adjusts the performance number of required display.
User can repeat above-mentioned action, to complete the radio frequency detector calibration of power.
Such as Fig. 4, the calibration of a kind of DTV broadband demodulation realizes the flow chart of method.
Claims (6)
1. digital TV transmitter broadband demodulation realizes a system, and this system includes:
Radio frequency numerical-control attenuator (1)；
Radiofrequency power detector (2)；
Operational amplifier (3)；
Analog-digital converter (4)；
Microprocessor (5), in FPGA mode, is connected with microcontroller by parallel data line or 12C bus, it is thus achieved that calibration data；
Microcontroller (6), transmits data with RS458 multi-computer communication or broadcast mode.
2. a kind of digital TV transmitter broadband demodulation according to claim 1 realizes system, and wherein the outfan of analog-digital converter (4) is connected with the clock of microprocessor (6), and the configuration interface of analog-digital converter (4) is connected with the control line of microprocessor.
3. a kind of digital TV transmitter broadband demodulation according to claim 1 realizes system, and wherein said microcontroller (6) provides clock signal to microprocessor (5), it is provided that serial ports, communicates by RS232 mode.
4. a kind of digital TV transmitter broadband demodulation according to Claims 2 or 3 realizes system, and wherein said microprocessor (5) configures bidirectional interface and RAM Read-write Catrol function, and provides relevant on-off model of reporting to the police.
5. the calibration of DTV broadband demodulation realizes a method, and the method includes:
Radiofrequency power detector (2) processes radiofrequency signal and converts analog voltage to；
This analog voltage is sent into analog-digital converter (4) and is carried out data sampling by operational amplifier (3)；
After analog-digital converter (4) processes data to be sampled, send microprocessor (5) to；
Microprocessor (5) processes sampled data, adopts power linear scope and the frequency response range of calibration module calibration radiofrequency power detector (2), it is thus achieved that after calibration data, feed back to radiofrequency power detector (2)；
Radiofrequency power detector (2) obtains corresponding compensating curve.
6. a kind of DTV broadband demodulation calibration according to claim 5 realizes method, and wherein said calibration module is,
Determine RF power level information, and send the information to radiofrequency power detector (2)；
After radiofrequency power detector (2) receives this information, send detecting circuit value to microprocessor (5)；
Microprocessor (5) carries out Data correction after detecting this detecting circuit value；
After Data correction, information is shown and inquiry.
Priority Applications (1)
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| CN201410812742.4A CN105791812A (en) | 2014-12-24 | 2014-12-24 | Digital television transmitter broadband detection implementation system and method |
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| CN201410812742.4A CN105791812A (en) | 2014-12-24 | 2014-12-24 | Digital television transmitter broadband detection implementation system and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106405219A (en) * | 2016-10-20 | 2017-02-15 | 成都前锋电子仪器有限责任公司 | Radio-frequency power reflectometer |
| CN109298657A (en) * | 2017-12-21 | 2019-02-01 | 上海创远仪器技术股份有限公司 | A method of time varying signal power detection and automatic growth control based on FPGA |
| CN111211802A (en) * | 2020-01-13 | 2020-05-29 | Oppo广东移动通信有限公司 | Programmable attenuator coupling device, radio frequency circuit and electronic equipment |
| CN111245380A (en) * | 2020-03-13 | 2020-06-05 | 西南科技大学 | Ka-band solid-state power amplifier predistorter |
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| CN101527604A (en) * | 2008-12-30 | 2009-09-09 | 湖北众友科技实业股份有限公司 | Method and device for automatic calibration of power for transmitter modules |
| CN102056005A (en) * | 2009-11-03 | 2011-05-11 | 北京同方吉兆科技有限公司 | Remote monitoring system used for television transmitter |
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| CN204633947U (en) * | 2014-12-24 | 2015-09-09 | 北京同方吉兆科技有限公司 | A kind of digital TV transmitter broadband demodulation implement device |
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| EP0589709A2 (en) * | 1992-09-25 | 1994-03-30 | Matsushita Electric Industrial Co., Ltd. | Multiresolution transmission system |
| CN101001327A (en) * | 2006-10-12 | 2007-07-18 | 成都新光微波工程有限责任公司 | Excitation apparatus of digital TV transmitter based on nerval net predistortion technology |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106405219A (en) * | 2016-10-20 | 2017-02-15 | 成都前锋电子仪器有限责任公司 | Radio-frequency power reflectometer |
| CN109298657A (en) * | 2017-12-21 | 2019-02-01 | 上海创远仪器技术股份有限公司 | A method of time varying signal power detection and automatic growth control based on FPGA |
| CN111211802A (en) * | 2020-01-13 | 2020-05-29 | Oppo广东移动通信有限公司 | Programmable attenuator coupling device, radio frequency circuit and electronic equipment |
| CN111245380A (en) * | 2020-03-13 | 2020-06-05 | 西南科技大学 | Ka-band solid-state power amplifier predistorter |
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