CN203798905U - Power grid frequency acquisition device in fixed telephone network - Google Patents
Power grid frequency acquisition device in fixed telephone network Download PDFInfo
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- CN203798905U CN203798905U CN201420098497.0U CN201420098497U CN203798905U CN 203798905 U CN203798905 U CN 203798905U CN 201420098497 U CN201420098497 U CN 201420098497U CN 203798905 U CN203798905 U CN 203798905U
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- telephone network
- fixed telephone
- main control
- control unit
- frequency acquisition
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Abstract
The utility model discloses a power grid frequency acquisition device in a fixed telephone network, and the power grid frequency acquisition device belongs to the technical field of power grid frequency acquisition, and aims to solve the technical problems in the prior art that the power grid frequency acquisition device is low in safety and poor in data storage safety. The power grid frequency acquisition device comprises a main control unit, a frequency acquisition system and a frequency storage system, wherein the main control unit is at least provided with an analog-to-digital converter and an external storage interface; the frequency acquisition system comprises a voltage transformer, a signal conditioning module and an anti-aliasing filtering module which are sequentially connected, the voltage transformer is electrically connected with the fixed telephone network, and the anti-aliasing filtering module is connected with the analog-to-digital converter; and the frequency storage system is connected with the main control unit through the external storage interface. The power grid frequency acquisition device selects the fixed telephone network with a nominal voltage far below a nominal voltage of the commercial power for frequency sampling, and is easier in voltage reduction and higher in safety; and the power grid frequency acquisition device adopts the external frequency storage system as a data storage unit, thus the data cannot be lost when encountering a sudden power outage, thereby fully guaranteeing the data safety and integrity.
Description
Technical field
The utility model relates to a kind of frequency collection device, and particularly mains frequency harvester in a kind of fixed telephone network, belongs to mains frequency acquisition technique field.
Background technology
Along with the arrival of digital times, it is more and more easier that the editor of the DAB of storing with digitized forms becomes, the more and more specialty of distorting.According to relevant department's investigation statistics: the positive cumulative year after year of crime rate based on DAB, video, image technique, the digital technology level that criminal uses also improves year by year.This just requires, when using these DABs as evidence, to must be noted that their primitiveness and integrality.The more important thing is that, if can identify the when and where of current audio frequency evidence, just can there be better reference in juridical authorities to whether adopting of evidence.So the research for DAB forensic technologies is necessary.
So-called voice evidence obtaining, is can determine for the recorded audio signals providing what word when and where who say, and which kind of equipment of employing is recorded, and whether this recorded audio signals be tampered, and the place of distorting where.Up-to-date audio forensics technology shows: the sound pick-up outfit of employing mains-supplied includes mains frequency feature in recording frequently, if recorded audio signals is obtained, analyzed and evaluates from mains frequency feature angle the related characteristic parameters such as its true or false, extraction and record length, recording location, carry out the identification of recording location, just can be used as the evidence of court or the approval of other administrative departments.
In prior art, there is a kind of mains frequency harvester, comprise host computer and for gathering the frequency collection point of 220V utility grid frequency, frequency collection point is sent to host computer by wireless communication unit by data, and host computer is stored in the database of host computer inside after the signal of reception is processed.
Its weak point is: the civil power of 220V is carried out to frequency collection, and voltage is relatively high, and the higher production cost that causes of safety requirements increases, and has larger potential safety hazard; The signal gathering is directly stored in the database of host computer, and burst power-off easily causes loss of data, and the security of data storage is lower.
Because fixed telephone network adopts mains-supplied equally, thus the mains frequency that inevitably can adulterate, and the nominal value of fixed telephone network voltage is only 50V, far below 220V line voltage.
Utility model content
The purpose of this utility model is to overcome the upper deficiency of prior art, and mains frequency harvester in a kind of fixed telephone network is provided, and solves the technical matters that the security of prior art medium frequency sampling apparatus is low, data storage security is not high.
The purpose of this utility model is achieved in that mains frequency harvester in a kind of fixed telephone network, comprise main control unit, frequency collection system and frequency storage system, on described main control unit, be at least connected with touch-screen, analog to digital converter and external memory interface; Described frequency collection system comprises voltage transformer (VT), signal condition module, the anti-aliasing filter module connecting successively, the input end of described voltage transformer (VT) is electrically connected to described fixed telephone network, and the output terminal of described anti-aliasing filter module is connected with the input end of described analog to digital converter; Described frequency storage system is connected with described main control unit by external memory interface.
As further improvement of the utility model, on described main control unit, be also connected with touch-screen, described touch-screen is provided with physical button and touch-screen button.The user that is set to of touch-screen provides good human-computer interaction interface.
As further improvement of the utility model, described main control unit is connected with computing machine by serial line interface.Main control unit can directly export to computing machine by data by this serial line interface, facilitates user to transfer and checks.
As preferred version of the present utility model, described frequency storage system is SD storage unit, and described external memory interface is SD draw-in groove, in described SD storage unit grafting and SD draw-in groove.
As preferred version of the present utility model, what described voltage transformer (VT) adopted is ZMPT107 Miniature precision voltage transformer (VT).ZMPT107 Miniature precision voltage transformer (VT) volume is little, lightweight, have higher accuracy.
As preferred version of the present utility model, what described signal condition module adopted is OPA2188 conditioning operational amplifier.
As preferred version of the present utility model, what described anti-aliasing filter module adopted is Sallen-Key second-order low-pass filter.Sallen-Key second-order low-pass filter is simple in structure, is convenient to automatically controlled tuningly, is particularly suitable for single slice integration technique, and can reduces the impact of stray capacitance, has higher stability and degree of accuracy.
As preferred version of the present utility model, what described main control unit adopted is STM32F103VET6 control chip.STM32F103VET6 control chip has higher operation efficiency with respect to common computer.
During the utility model work, frequency collection system carries out being sent to main control unit after step-down, conditioning, filtering to 50V fixed telephone network successively, main control unit carries out analog to digital conversion by the signal of reception, and carries out Frequency Measurement Algorithm computing, and operation result is transferred to frequency storage system.Compared with prior art, the beneficial effects of the utility model are: selecting nominal value is that the fixed telephone network of 50V carries out frequency sampling, and the line voltage step-down that nominal value is 220V is relatively easier, and security is higher; Adopt external frequency storage system as data storage cell, during burst power-off, data are not lost, and have larger storage space with respect to computer-internal storage, have fully guaranteed security and the integrality of data.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1, mains frequency harvester in a kind of fixed telephone network, comprises main control unit, frequency collection system and frequency storage system.
Main control unit is provided with analog to digital converter, external memory interface, serial line interface and the touch-screen for carrying out man-machine interaction with user, is connected with computing machine on serial line interface.Main control unit can be selected STM32F103VET6 control chip, subsidiary DSP algorithms library in STM32F103VET6 control chip, touch-screen can be selected reaction time TFT touch-screen faster, touch-screen is provided with physical button and touch-screen button, physical button includes " start " key, " reset " key, " shutdown " key, and touch-screen button includes " starting to gather " key, " suspend and gather " key, " data dump " key, " data derivation " key, numeric keypad, " password modification " key and " password confirming " key.
Frequency collection system comprises voltage transformer (VT), signal condition module, the anti-aliasing filter module connecting successively, and the input end of voltage transformer (VT) is electrically connected to fixed telephone network, and the output terminal of anti-aliasing filter module is connected with the input end of analog to digital converter.Preferably, voltage transformer (VT) is selected ZMPT107 Miniature precision voltage transformer (VT), and signal condition module is selected OPA2188 conditioning operational amplifier, and anti-aliasing filter module is selected Sallen-Key second-order low-pass filter.
Frequency storage system is connected with main control unit by external memory interface.Frequency storage system can be selected SD storage unit, corresponding, and external memory interface is SD draw-in groove, and SD storage unit is plugged in SD draw-in groove.
The utility model is not limited to above-described embodiment; on the basis of the disclosed technical scheme of the utility model; those skilled in the art is according to disclosed technology contents; do not need performing creative labour just can make some replacements and distortion to some technical characterictics wherein, these replacements and distortion are all in protection domain of the present utility model.
Claims (8)
1. a mains frequency harvester in fixed telephone network, is characterized in that, comprises main control unit, frequency collection system and frequency storage system, is at least provided with analog to digital converter and external memory interface on described main control unit; Described frequency collection system comprises voltage transformer (VT), signal condition module, the anti-aliasing filter module connecting successively, the input end of described voltage transformer (VT) is electrically connected to described fixed telephone network, and the output terminal of described anti-aliasing filter module is connected with the input end of described analog to digital converter; Described frequency storage system is connected with described main control unit by external memory interface.
2. mains frequency harvester in fixed telephone network according to claim 1, is characterized in that, is also connected with touch-screen on described main control unit, and described touch-screen is provided with physical button and touch-screen button.
3. mains frequency harvester in fixed telephone network according to claim 1, is characterized in that, described main control unit is connected with computing machine by serial line interface.
4. mains frequency harvester in fixed telephone network according to claim 1, is characterized in that, described frequency storage system is SD storage unit, and described external memory interface is SD draw-in groove, in described SD storage unit grafting and SD draw-in groove.
5. mains frequency harvester in fixed telephone network according to claim 1, is characterized in that, what described voltage transformer (VT) adopted is ZMPT107 Miniature precision voltage transformer (VT).
6. mains frequency harvester in fixed telephone network according to claim 1, is characterized in that, what described signal condition module adopted is OPA2188 conditioning operational amplifier.
7. mains frequency harvester in fixed telephone network according to claim 1, is characterized in that, what described anti-aliasing filter module adopted is Sallen-Key second-order low-pass filter.
8. mains frequency harvester in fixed telephone network according to claim 1, is characterized in that, what described main control unit adopted is STM32F103VET6 control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420098497.0U CN203798905U (en) | 2014-03-06 | 2014-03-06 | Power grid frequency acquisition device in fixed telephone network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420098497.0U CN203798905U (en) | 2014-03-06 | 2014-03-06 | Power grid frequency acquisition device in fixed telephone network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203798905U true CN203798905U (en) | 2014-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420098497.0U Expired - Fee Related CN203798905U (en) | 2014-03-06 | 2014-03-06 | Power grid frequency acquisition device in fixed telephone network |
Country Status (1)
| Country | Link |
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| CN (1) | CN203798905U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167660A (en) * | 2017-05-16 | 2017-09-15 | 中国电子科技集团公司第四十研究所 | The external memory formula spectrum analyzer and its method of a kind of high security |
-
2014
- 2014-03-06 CN CN201420098497.0U patent/CN203798905U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167660A (en) * | 2017-05-16 | 2017-09-15 | 中国电子科技集团公司第四十研究所 | The external memory formula spectrum analyzer and its method of a kind of high security |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140827 Termination date: 20150306 |
|
| EXPY | Termination of patent right or utility model |