CN105116220A - Signal analyzing device used for synchronously separating signals and noise and analyzing method thereof - Google Patents
Signal analyzing device used for synchronously separating signals and noise and analyzing method thereof Download PDFInfo
- Publication number
- CN105116220A CN105116220A CN201510458923.6A CN201510458923A CN105116220A CN 105116220 A CN105116220 A CN 105116220A CN 201510458923 A CN201510458923 A CN 201510458923A CN 105116220 A CN105116220 A CN 105116220A
- Authority
- CN
- China
- Prior art keywords
- signal
- bandpass filter
- noise
- filter
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
The invention discloses a signal analyzing device used for synchronously separating signals and noise and an analyzing method thereof. The input ends of the first filtering branch and a second filtering branch are respectively connected with an AD converter. The AD converter inputs medium-frequency analog signals. The output ends of the first filtering branch and the second filtering branch are respectively connected with a subtractor used for achieving subtraction operations of two paths of signals. The subtractor is connected to a signal index memory through a comparator. The comparator is used for comparing the difference setting thresholds of the two paths of digital signals and outputting the index value of the digital signal on the point to the signal index memory for storage. The noise power bandwidth characteristics and the band limited signal characteristics are fully researched. The two filtering branches are adopted to filter signals synchronously. Synchronous separation of signals and noise is achieved.
Description
Technical field
The present invention relates to signal transacting field, the signal analysis device of especially a kind of synchronizing signal separation and noise and analytical approach thereof.
Background technology
In fast signal analysis or monitoring equipment, before the in-depth analysis of signal, first need to find signal, determine the center frequency points of signal from frequency, or the taking of frequency spectrum.Current analyser or monitoring equipment are all generally searched for by the spectrum peak of software, after the default frequency range of scanning full, adopt software mode, comprise peak search algorithm and peak value threshold judgement, by first searching mathematical extreme point, comprise maximum value and minimal value, and then extreme value is carried out to the judgement of peak value threshold, thresholding size is set by the user, the number of last peak value or whether be peak value, be limited to the setting of parameter, namely the experience of user is limited to, different user is arranged, final search or the signal confirmed are different, even noise, if the performance number surveyed is larger or the same than periphery weak signal, extreme value based on mathematics judges, also signal can be judged to be.In addition, the search of signal peak is carried out after whole frequency range has scanned again, the start-up time of search, depend on the speed of scanning, under little definition case, search speed is very slow, often need the sweep time grown very much, therefore bring the seriously delayed of signal transacting.For the signal needing to process immediately, or some change ratio signal faster, if need to find that namely deeply process is as demodulation or record etc., wait whole frequency range to scan, signal may disappear.In addition, wider at scanning band, when sweep frequency is counted very many, the search efficiency of signal will greatly restrict the raising of instrumental analysis performance.
The shortcoming of prior art: after needing to have scanned all Frequency points of whole frequency range, just can carry out the extreme point search of spectrum power, then on extreme point, carry out the search of peak signal, the identification of such signal is far away after the scanning, when needing to carry out analytical solution timing to the signal found further, signal may to disappear or saltus step.Cannot distinguish signal and noise in addition, larger noise may be taken as signal peak.
Summary of the invention
In order to solve the deficiencies in the prior art, the present invention is by studying and utilize frequency spectrum characteristic and the characteristic of signal and noise, and design scaning treatment device, analyser instant scanning in whole frequency range can be made immediately to find signal, do not need to wait for that whole band scan completes, change the instrument treatment scheme and method of work that first scan and search for afterwards, greatly can improve the performance of instrument.
The present invention adopts following technical scheme:
The signal analysis device of synchronizing signal separation and noise, comprise two the first filter branch, the second filter branch arranged side by side, first filter branch comprises the first bandpass filter, the first interpolation extracting unit and the first peak value detection unit that are communicated with successively, second filter branch comprises the second bandpass filter, the second interpolation extracting unit and the second peak detection unit that are communicated with successively, wherein, first bandpass filter and the second bandpass filter are that two centre frequencies are the same, the different resolution wave filter of bandwidth;
Described first filter branch is connected AD converter respectively with the input end of the second filter branch, AD converter input analog intermediate frequency signal, first filter branch is connected the subtracter for realizing two paths of signals subtraction respectively with the output terminal of the second filter branch, subtracter is by comparer connection signal index store, comparer is for realizing the comparison of the difference setting threshold value of two ways of digital signals, and the index value exporting this digital signal stores to signal index store.
Described first bandpass filter and the second bandpass filter are onrecurrent type bandpass filter, by the spectrum analysis of on-the-spot gate array FPGA programming realization different resolution able to programme.
Described signal index store is storer, for storing the signal index value that front end exports, and is transferred to host software reading.
The output terminal of described first peak value detection unit is also connected with analysis of spectrum or demodulating unit, realizes analysis or the demodulation process of frequency spectrum.
Analytical approach based on the signal analysis device of above-mentioned synchronizing signal separation and noise adopts following steps:
(1) intermediate-freuqncy signal is in real time through AD sampling, after becoming numerical data, enters this device and divide into two-way, entering the first bandpass filter and the second bandpass filter simultaneously;
(2) first bandpass filter download different filter coefficients from the second bandpass filter, make the first bandpass filter consistent with the second bandpass filter centre frequency, but passband width is inconsistent, and in certain multiple proportional, after signal and noise enter the first bandpass filter and the second bandpass filter, because signal is the bandlimited signal with certain bandwidth, and noise signal is uniformly distributed in whole frequency band at random, frequency of heart place power difference is 0 in the signal, finds the centre frequency of signal while frequency sweeping;
(3) what the data rate of two-way was consistent enters subtracter, and subtracter pointwise carries out to signal data the data difference that subtraction obtains two-way;
(4) data difference of two-way enters comparer and sets threshold value and compares:
As being less than or equal to this threshold value, the index value of this point stored in signal index store below, main frame reads all index values from this storer, then is multiplied by scanning step value, obtains the frequency values of signal;
Otherwise, be noise instead of signal.
The performance number that the centre frequency both sides of described step (2) record is different, the centre frequency leaving signal is remotely 10Log (B1/B2), wherein B1 and B2 is the passband width of the first bandpass filter and the second bandpass filter respectively, and in the center frequency points of signal, performance number is then the same.
The Advantageous Effects adopting as above technical scheme to obtain is:
The present invention can be applied in signal monitoring receiver or other signal analysis instrument, utilize the power characteristic distributions of bandlimited signal and noise, to be searched greatly by mathematical way and the centre frequency of smaller value search signal again relative to traditional, the fast search of signal can not only be realized, reach the search of scanning limit, limit, and because meet signal physical characteristics, make the signal center frequency that searches more accurately more credible.Can start deep signal analysis while searching signal, avoid the disappearance of transient signal, this is that classical signal searching method can not possess.
The present invention realizes with low cost, is applied to the performance advantage that microwave apparatus can improve instrument greatly.
Accompanying drawing explanation
Fig. 1 is the signal analysis device block diagram of synchronizing signal separation and noise.
Fig. 2 is the signal analysis example of synchronizing signal separation and noise.
Embodiment
1 to 2 pair of the specific embodiment of the present invention is described further by reference to the accompanying drawings:
The signal analysis device of synchronizing signal separation and noise, comprise two the first filter branch, the second filter branch arranged side by side, first filter branch comprises the first bandpass filter, the first interpolation extracting unit and the first peak value detection unit that are communicated with successively, second filter branch comprises the second bandpass filter, the second interpolation extracting unit and the second peak detection unit that are communicated with successively, wherein, first bandpass filter and the second bandpass filter are that two centre frequencies are the same, the different resolution wave filter of bandwidth.First filter branch is connected AD converter respectively with the input end of the second filter branch, AD converter input analog intermediate frequency signal, first filter branch is connected the subtracter for realizing two paths of signals subtraction respectively with the output terminal of the second filter branch, subtracter is by comparer connection signal index store, comparer is for realizing the comparison of the difference setting threshold value of two ways of digital signals, and the index value exporting this digital signal stores to signal index store.
First bandpass filter and the second bandpass filter are onrecurrent type bandpass filter and FIR filter, by the spectrum analysis of on-the-spot gate array FPGA programming realization different resolution able to programme.
Signal index store is storer, for storing the signal index value that front end exports, and is transferred to host software reading.
The output terminal of the first peak value detection unit is also connected with analysis of spectrum or demodulating unit, realizes analysis or the demodulation process of frequency spectrum.
Analytical approach based on the signal analysis device of above-mentioned synchronizing signal separation and noise adopts following steps:
(1) intermediate-freuqncy signal is in real time through AD sampling, after becoming numerical data, enters this device and divide into two-way, entering the first bandpass filter and the second bandpass filter simultaneously;
(2) first bandpass filter download different filter coefficients from the second bandpass filter, make the first bandpass filter consistent with the second bandpass filter centre frequency, but passband width is inconsistent, and in certain multiple proportional, after signal and noise enter the first bandpass filter and the second bandpass filter, because signal is the bandlimited signal with certain bandwidth, and noise signal is uniformly distributed in whole frequency band at random, frequency of heart place power difference is 0 in the signal, finds the centre frequency of signal while frequency sweeping;
(3) what the data rate of two-way was consistent enters subtracter, and subtracter pointwise carries out to signal data the data difference that subtraction obtains two-way;
(4) data difference of two-way enters comparer and sets threshold value and compares:
As being less than or equal to this threshold value, the index value of this point stored in signal index store below, main frame reads all index values from this storer, then is multiplied by scanning step value, obtains the frequency values of signal;
Otherwise, be noise instead of signal.
The performance number that the centre frequency both sides of described step (2) record is different, the centre frequency leaving signal is remotely 10Log (B1/B2), wherein B1 and B2 is the passband width of the first bandpass filter and the second bandpass filter respectively, and in the center frequency points of signal, performance number is then the same.
In certain model microwave spectrometer, all originally after waiting for that whole band scan completes, pass through again to search mathematical extreme point in order in all spectrum scan data sequences, comprise maximum value and minimal value, and then extreme value is carried out to the judgement of peak value threshold, thresholding size is set by the user, and namely the maximum point exceeding thresholding is judged as signal peak.By the numeric ratio of mathematics comparatively, the characteristic of signal and noise cannot be considered, if noise is superimposed upon on signal or some noise power exceedes signal and may be taken as signal peak.
Realize the spectrum scan of 1GHz to 40GHz, sweep spacing is 300Hz, altogether 130M frequency, adopts conventional search methods to be quite slow, therefore in order to when signal occurs, can identify signal in time, adopts the solution of the present invention.As shown in Figure 1, the overall FPGA of employing realizes, and the first bandpass filter and the second bandpass filter are realized by programmable logic device (PLD), can download the coefficient of wave filter, and realize the filtering bandwidth of different bandwidth.
User selects the filter coefficient downloading 1KHz to the first bandpass filter, download the FIR filter coefficient of 10KHz to the second bandpass filter, first bandpass filter becomes the FIR filter that resolution bandwidth is 1KHz, second bandpass filter becomes the FIR filter that resolution bandwidth is 10KHz, after filtering, by interpolation extracting unit, owing to not needing to carry out sampling rate conversion, thus this unit does not carry out the process of interpolation and extraction, therefore two paths of signals does not need sampling rate to adjust, and data rate is consistent.
Peak detection unit carries out peak-peak detection, on the frequency spectrum point not having signal, the difference power of two paths of signals is 10log (10/1)=10dB, as shown in Figure 2, from initial frequency to the appearance point frequency 20.5GHz near signal, the power difference mainly noise of two paths of signals, substantially be all 10dB, when close to centre frequency place, the power difference of two paths of signals detection is more and more less until 0, leave the disappearance Frequency point of centre frequency place to signal of signal, the difference power of two paths of signals detection is increasing, until 10dB, if the termination frequency place from blackout to scanning does not have other signal to occur, then the difference power of two paths of signals keeps 10dB.Complete the difference power of two paths of signals detection at subtracter after, enter comparer, compare with 0dB value or one very low-power measurement error threshold (this instrument power measurement error 0.1dB), if reach 0dB or 0.1dB, then determine to have searched signal and the frequency values of signal is 20.5GHz, the index value 65000000 of this analyzing spot directly incorporates in signal index store below.Subscriber's main station passes through formulae discovery 65M/130M* (40-1) G+1G=20.5GHz after reading 65000000.Otherwise, be noise instead of signal.
Certainly; more than illustrate and be only preferred embodiment of the present invention; the present invention is not limited to enumerate above-described embodiment; should be noted that; any those of ordinary skill in the art are under the guidance of this instructions; made all equivalently to substitute, obvious form of distortion, within the essential scope all dropping on this instructions, protection of the present invention ought to be subject to.
Claims (6)
1. the signal analysis device of synchronizing signal separation and noise, it is characterized in that, comprise two the first filter branch, the second filter branch arranged side by side, first filter branch comprises the first bandpass filter, the first interpolation extracting unit and the first peak value detection unit that are communicated with successively, second filter branch comprises the second bandpass filter, the second interpolation extracting unit and the second peak detection unit that are communicated with successively, wherein, first bandpass filter and the second bandpass filter are that two centre frequencies are the same, the different resolution wave filter of bandwidth;
Described first filter branch is connected AD converter respectively with the input end of the second filter branch, AD converter input analog intermediate frequency signal, first filter branch is connected the subtracter for realizing two paths of signals subtraction respectively with the output terminal of the second filter branch, subtracter is by comparer connection signal index store, comparer is for realizing the comparison of the difference setting threshold value of two ways of digital signals, and the index value exporting this digital signal stores to signal index store.
2. the signal analysis device of synchronizing signal separation according to claim 1 and noise, it is characterized in that, described first bandpass filter and the second bandpass filter are onrecurrent type bandpass filter, by the spectrum analysis of on-the-spot gate array FPGA programming realization different resolution able to programme.
3. the signal analysis device of synchronizing signal separation according to claim 1 and noise, is characterized in that, described signal index store is storer, for storing the signal index value that front end exports, and is transferred to host software reading.
4. the signal analysis device of synchronizing signal separation according to claim 1 and noise, is characterized in that, the output terminal of described first peak value detection unit is also connected with analysis of spectrum or demodulating unit, realizes analysis or the demodulation process of frequency spectrum.
5. the analytical approach of the synchronizing signal separation according to Claims 1-4 any one and the signal analysis device of noise, is characterized in that, the signal analysis method of synchronizing signal separation and noise adopts following steps:
(1) intermediate-freuqncy signal is in real time through AD sampling, after becoming numerical data, enters this device and divide into two-way, entering the first bandpass filter and the second bandpass filter simultaneously;
(2) first bandpass filter download different filter coefficients from the second bandpass filter, make the first bandpass filter consistent with the second bandpass filter centre frequency, but passband width is inconsistent, and in certain multiple proportional, after signal and noise enter the first bandpass filter and the second bandpass filter, because signal is the bandlimited signal with certain bandwidth, and noise signal is uniformly distributed in whole frequency band at random, frequency of heart place power difference is 0 in the signal, finds the centre frequency of signal while frequency sweeping;
(3) what the data rate of two-way was consistent enters subtracter, and subtracter pointwise carries out to signal data the data difference that subtraction obtains two-way;
(4) data difference of two-way enters comparer and sets threshold value and compares:
As being less than or equal to this threshold value, the index value of this point stored in signal index store below, main frame reads all index values from this storer, then is multiplied by scanning step value, obtains the frequency values of signal;
Otherwise, be noise instead of signal.
6. the signal analysis method of synchronizing signal separation according to claim 5 and noise, it is characterized in that, the performance number that the centre frequency both sides of described step (2) record is different, the centre frequency leaving signal is remotely 10Log (B1/B2), wherein B1 and B2 is the passband width of the first bandpass filter and the second bandpass filter respectively, and in the center frequency points of signal, performance number is then the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510458923.6A CN105116220B (en) | 2015-07-30 | 2015-07-30 | The signal analysis device and its analysis method of synchronizing signal separation and noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510458923.6A CN105116220B (en) | 2015-07-30 | 2015-07-30 | The signal analysis device and its analysis method of synchronizing signal separation and noise |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105116220A true CN105116220A (en) | 2015-12-02 |
| CN105116220B CN105116220B (en) | 2017-11-17 |
Family
ID=54664256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510458923.6A Active CN105116220B (en) | 2015-07-30 | 2015-07-30 | The signal analysis device and its analysis method of synchronizing signal separation and noise |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105116220B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107104674A (en) * | 2016-02-23 | 2017-08-29 | 上海贝岭股份有限公司 | Noise power estimation apparatus in electric parameter metering process |
| CN111066083A (en) * | 2017-09-11 | 2020-04-24 | 罗伯特·博世有限公司 | Method and apparatus for processing signals |
| CN111983309A (en) * | 2020-08-28 | 2020-11-24 | 武汉鸿阳机电工程有限公司 | Method and device for detecting abnormality of sampling data |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01188084A (en) * | 1988-01-21 | 1989-07-27 | Matsushita Electric Ind Co Ltd | Noise cancellor device |
| EP0437861A2 (en) * | 1990-01-16 | 1991-07-24 | Hitachi, Ltd. | Signal processing method and system. |
| EP0849939A2 (en) * | 1996-12-19 | 1998-06-24 | Matsushita Electric Industrial Co., Ltd. | Motion detection circuit and memory control circuit in YC separating circuit of PAL signals |
| CN1308798A (en) * | 1998-06-10 | 2001-08-15 | 日本放送协会 | Calceller for jamming wave by interence |
| US6415139B1 (en) * | 1997-11-26 | 2002-07-02 | Oki Electric Industry Co, Ltd. | Detection circuit of tone signal |
| CN1440135A (en) * | 2002-02-13 | 2003-09-03 | 日本电气株式会社 | Method for reducing interferes between sub-carriers in multi-carrier communication system and receiver therefor |
| CN101237253A (en) * | 2008-02-29 | 2008-08-06 | 哈尔滨工业大学 | Self-adapted interference separation signal receiving/transmission device based on fraction Fourier conversion |
-
2015
- 2015-07-30 CN CN201510458923.6A patent/CN105116220B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01188084A (en) * | 1988-01-21 | 1989-07-27 | Matsushita Electric Ind Co Ltd | Noise cancellor device |
| EP0437861A2 (en) * | 1990-01-16 | 1991-07-24 | Hitachi, Ltd. | Signal processing method and system. |
| EP0849939A2 (en) * | 1996-12-19 | 1998-06-24 | Matsushita Electric Industrial Co., Ltd. | Motion detection circuit and memory control circuit in YC separating circuit of PAL signals |
| US6415139B1 (en) * | 1997-11-26 | 2002-07-02 | Oki Electric Industry Co, Ltd. | Detection circuit of tone signal |
| CN1308798A (en) * | 1998-06-10 | 2001-08-15 | 日本放送协会 | Calceller for jamming wave by interence |
| CN1440135A (en) * | 2002-02-13 | 2003-09-03 | 日本电气株式会社 | Method for reducing interferes between sub-carriers in multi-carrier communication system and receiver therefor |
| CN101237253A (en) * | 2008-02-29 | 2008-08-06 | 哈尔滨工业大学 | Self-adapted interference separation signal receiving/transmission device based on fraction Fourier conversion |
Non-Patent Citations (2)
| Title |
|---|
| 许建华: "频谱分析仪在噪声测量中的应用", 《电子测量技术》 * |
| 魏福立 等: "具有快速锁定时间的新型低相噪频率合成技术", 《半导体技术》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107104674A (en) * | 2016-02-23 | 2017-08-29 | 上海贝岭股份有限公司 | Noise power estimation apparatus in electric parameter metering process |
| CN107104674B (en) * | 2016-02-23 | 2022-01-21 | 上海贝岭股份有限公司 | Noise power estimation device in electric parameter measurement process |
| CN111066083A (en) * | 2017-09-11 | 2020-04-24 | 罗伯特·博世有限公司 | Method and apparatus for processing signals |
| CN111066083B (en) * | 2017-09-11 | 2023-10-31 | 罗伯特·博世有限公司 | Method and apparatus for processing signals |
| CN111983309A (en) * | 2020-08-28 | 2020-11-24 | 武汉鸿阳机电工程有限公司 | Method and device for detecting abnormality of sampling data |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105116220B (en) | 2017-11-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107612865B (en) | Signal noise reduction method applied to low-voltage power line carrier communication | |
| CN105913835B (en) | Adaptive filtering method based on mathematical morphology | |
| CN102386889B (en) | Baseline shift minimizing technology, device and median filter | |
| CN105356886B (en) | Power line noise compression method and device based on compressed sensing | |
| US11567613B2 (en) | Signal processing system, chip and active stylus | |
| CN101132240A (en) | Standing wave detecting device and method thereof | |
| WO2017151460A1 (en) | Signal detection from digital interface | |
| CN105116220A (en) | Signal analyzing device used for synchronously separating signals and noise and analyzing method thereof | |
| EP2088676A2 (en) | Systems and methods for detecting a signal across multiple nyquist bands | |
| CN114374411B (en) | Low-frequency power line carrier topology identification method | |
| Ahmadi et al. | Types of EMD algorithms | |
| CN105915193B (en) | A kind of improvement generation method for multiphase filter | |
| CN103823177A (en) | Performance detecting method and system for filter based on window function design | |
| CN110034831B (en) | Low-complexity frequency spectrum monitoring device and method | |
| CN102769904B (en) | Method and device for capturing terminal main synchronization signals in LTE (long term evolution) system | |
| CN208445556U (en) | The detection device of OFDM electric line communication system narrowband interference | |
| CN108627743B (en) | Lossless capture method for partial discharge nanosecond narrow pulse sequence | |
| CN204810275U (en) | Radio signal monitors analytic system based on IQ data | |
| CN103197142B (en) | Method for simultaneously acquiring unknown frequency continuous analog signal and burst digital signal | |
| CN203423805U (en) | Lte signal identification device | |
| US8606189B2 (en) | System and method for wideband wireless system scanning | |
| CN115347978A (en) | Method, device and storage medium for identifying AIS frame header data | |
| CN112116917B (en) | Phase jump degree-based method for separating acoustic signals of reactor body and fan | |
| JPH0787148A (en) | Synchronous adder | |
| CN109586763B (en) | Denoising method and denoising system for spread spectrum signal in electronic communication system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Li Ligong Inventor after: Xu Jianhua Inventor after: Wang Baorui Inventor after: Du Huiwen Inventor after: Liu Dan Inventor before: Wang Baorui Inventor before: Xu Jianhua Inventor before: Du Huiwen Inventor before: Liu Dan |
|
| COR | Change of bibliographic data | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190227 Address after: 266555 Xiangjiang 98, Huangdao District, Qingdao City, Shandong Province Patentee after: China Electronics Technology Instrument and Meter Co., Ltd. Address before: 266555 No. 98 Xiangjiang Road, Qingdao economic and Technological Development Zone, Shandong Patentee before: The 41st Institute of CETC |
|
| TR01 | Transfer of patent right | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 266555 Xiangjiang 98, Huangdao District, Qingdao City, Shandong Province Patentee after: CLP kesiyi Technology Co.,Ltd. Address before: 266555 Xiangjiang 98, Huangdao District, Qingdao City, Shandong Province Patentee before: CHINA ELECTRONIC TECHNOLOGY INSTRUMENTS Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |