CN107547977A - A kind of anti-phonographic recorder of low-and high-frequency for mini-session - Google Patents
A kind of anti-phonographic recorder of low-and high-frequency for mini-session Download PDFInfo
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- CN107547977A CN107547977A CN201710953716.7A CN201710953716A CN107547977A CN 107547977 A CN107547977 A CN 107547977A CN 201710953716 A CN201710953716 A CN 201710953716A CN 107547977 A CN107547977 A CN 107547977A
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- 230000002452 interceptive effect Effects 0.000 abstract description 3
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Abstract
The invention belongs to monitor communication technique field, a kind of anti-phonographic recorder of the low-and high-frequency for mini-session is disclosed, is provided with power subsystem, control unit, display screen, shift knob, time setting button, signal processing unit, high-frequency emission unit, low frequencies unit.The power subsystem provides power supply for whole system, and described control unit is circumscribed with display screen, shift knob, time setting button, and described signal processing unit one end is connected with control unit, and one end is connected with high-frequency emission unit and low frequencies unit.Present device is compact, light, is easy to hide；Set-up function containing having time, it is provided with before facilitating meeting, after system time reaches setting time, equipment will turn off, and add the crypticity of equipment；Interfering frequency will not bring harm not in the audible scope of human ear to human body and environment.
Description
Technical field
The invention belongs to monitor communication technique field, more particularly to a kind of anti-phonographic recorder of low-and high-frequency for mini-session.
Background technology
Conventional anti-eavesdropping means and methods at present：Wireless signal acquisition instrument, radio frequency interference instrument, use white noise
Or audio mixing equipment.
Existing published patent：
1st, in patent " one kind recording shielding device (CN204231373 U) ", employ upset circuit and saturation microphone is defeated
The mode gone out disturbs recording, i.e., sound source is disturbed using background scene sound.Can disturb pickup frequency 100Hz-
The recording effect of 20000Hz digital recording pen, tape recorder and mobile phone, makes recording pen or recorder is recorded to simply one
Piece " drone " noise, the conversation content of teller can not be recorded to, the sound being recorded to, which passes through post-processing, can not also restore
The sound of teller.
2nd, in patent " one kind is counter to monitor anti-monitoring device " (CN 105162941), signal sensor is contained, can be investigated
With the presence or absence of monitoring or supervision equipment in certain area, when monitoring supervision equipment is inconvenient to extract, usable electronic signal is done
Disturb device to be disturbed, for the signal that can not be investigated, user can use emitting noise switch to be disturbed；For mobile phone etc.
3G the or 4G signals sent can not be arrived by investigation, can be switched using signal shielding, so as to be played instead to mobile devices such as mobile phones
Monitor or monitoring acts on.
In summary, the problem of prior art is present be：Existing recording shielding device only may interfere with pickup frequency and exist
The recording effect of 100Hz -20000Hz digital recording pen, tape recorder and mobile phone, for pickup frequency be less than 100Hz or
Person is more than 20000Hz recording interference effect unobvious；It is counter to monitor anti-monitoring device and detected using wireless detector
Effect is not had when recorded audio signals.
The content of the invention
The problem of existing for prior art, the invention provides a kind of anti-phonographic recorder of the low-and high-frequency for mini-session.
The present invention is achieved in that a kind of anti-phonographic recorder of the low-and high-frequency for mini-session, described to be used for mini-session
Low-and high-frequency anti-phonographic recorder control unit is set；The described control unit reduction of fractions to a common denominator is not pressed with display screen, shift knob, time setting
Button, signal processing unit are electrically connected with；The signal processing unit electrically connects with high-frequency emission unit, low frequencies unit respectively
Connect.
Further, the anti-phonographic recorder of the low-and high-frequency for mini-session is additionally provided with power subsystem；The power subsystem
Connect control unit, display screen, shift knob, time setting button, signal processing unit, high-frequency emission list respectively by wire
Member, low frequencies unit；
The display screen is LED display.
Further, the display screen is LED display.
Further, the high-frequency emission unit is used to launch the signal more than 20000Hz frequencies.
Further, the low frequencies unit is used to launch the signal less than 20Hz frequencies.
Further, described control unit is realized based on STM32 embedded programs, when pressing shift knob, during starting device,
System initialization, after the parameters such as setting time, working frequency, numerical value that internal processes will accordingly provide according to user, change
The numerical value of Internal Control Procedure, and then the numerical value of timer is set, the signal of system output corresponding frequencies is controlled, when timing reaches
To after the default time, control timer interrupts, EP (end of program).
Further, the signal processing unit receives the control instruction from control unit, according to demand signals, calculates
Corresponding signal table, is stored it in ROM.It is that system clock produces frequency source letter to use internal crystal oscillator or external crystal-controlled oscillation first
Number, according to the frequency range given in corresponding control instruction, provide corresponding frequency dividing and Clock Multiplier Factor, complete signal frequency dividing or
Process of frequency multiplication, the conversion of frequency is realized, by the selection of inside and outside crystal oscillator, obtained signal is sent to timer, control unit pair
The parameter of timer is configured, and the corresponding information table stored in corresponding ROM is taken out in then control, makes each of the output train of impulses
Pulse width is changed by it, desired signal is produced, for completing the signal output of different frequency.
Advantages of the present invention and good effect are：The anti-phonographic recorder of low-and high-frequency for being used for mini-session is carried out to sound pick-up outfit
Interference, and the recording being interfered after treatment can not separate meeting speech content, ensure that country, enterprise with
And personal confidential information, prevent criminal from stealing secret by certain equipment；The equipment is compact, light, is easy to hide,
Also can be used when wireless detector can not be used to detect recorded audio signals；Set-up function containing having time, before facilitating meeting
It is provided with, after system time reaches setting time, equipment will turn off, and add the crypticity of equipment；Interfering frequency is not
In the audible scope of human ear, harm will not be brought to human body and environment.
This is used for the anti-phonographic recorder of low-and high-frequency of mini-session, can by TIMER (timer) functions of ARM single-chip microcomputers and
PWM is exported, and its circuit design is simple, directly can realize the control of system and the production of signal generator simultaneously using software programming
Raw, the signal of caused different low-and high-frequencies is to disturbing sound pick-up outfit, and the caused adjustable nothing of frequency signal frequency range
Rule can be followed, and make that acoustoelectric sensor receives is a kind of vibration of irregular similar white noise, the recording warp being interfered
It is not easy to separate meeting speech content after crossing processing, ensure that the confidential information of country, enterprise and individual, prevent not
Method molecule steals secret by certain equipment；Set-up function containing having time, it is provided with before facilitating meeting, system time reaches
After setting time, equipment will turn off, and add the crypticity of equipment；Interfering frequency not in the audible scope of human ear,
Harm will not be brought to human body and environment.The single-chip microcomputer kernel collection high-performance, equipment are compact, light, are easy to hide, can apply
In many built-in fields, requirement of the system to hardware circuit is reduced, reliability is high, and cost is low, and the construction cycle is short.
Brief description of the drawings
Fig. 1 is the structural representation provided by the present invention for the anti-phonographic recorder of low-and high-frequency of mini-session；
In figure：1st, power subsystem；2nd, control unit；3rd, display screen；4th, shift knob；5th, time setting button；6th, signal
Processing unit；7th, high-frequency emission unit；8th, low frequencies unit.
Fig. 2 is control unit STM32 circuit diagrams provided by the invention；
Fig. 3 is the control method flow chart of control unit provided by the invention.
Fig. 4 is signal processing unit flow chart provided by the invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that specific embodiment described herein is not used to limit only to explain the present invention
The fixed present invention.
The structure of the present invention is explained in detail below in conjunction with the accompanying drawings.
As shown in figure 1, the anti-phonographic recorder of the low-and high-frequency provided in an embodiment of the present invention for mini-session is provided with power supply list
Member 1, control unit (STM32) 2, display screen 3, shift knob 4, time setting button 5, signal processing unit 6, high-frequency emission list
Member 7, low frequencies unit 8.The power subsystem 1 provides power supply for whole system, described control unit 2 be circumscribed with display screen 3,
Shift knob 4, time setting button 5, described one end of signal processing unit 6 are connected with control unit 2, one end and high-frequency emission list
Member 7 and low frequencies unit 8 connect.
Display screen 3 provided in an embodiment of the present invention is LED display.
High-frequency emission unit 7 provided in an embodiment of the present invention is used to launch the signal more than 20000Hz frequencies.
Low frequencies unit 8 provided in an embodiment of the present invention is used to launch the signal less than 20Hz frequencies.
The present invention provides power supply by power subsystem 1 for whole system, in use, pressing shift knob 4, passage time sets
Determine button 5 and set usage time before a conference begins, after system time reaches setting time, equipment will turn off；Pass through control
Unit 2 processed generates carrier signal, and is sent to signal processing unit 6, the reception signal of signal processing unit 6, and signal is made
Certain processing, signal is set to meet different tranmitting frequencies, the transmitting of high-frequency emission unit 7 is more than the signal of 20000Hz frequencies,
The transmitting of low frequencies unit 8 is less than the signal of 20Hz frequencies, and the low-and high-frequency signal frequency currently launched is shown by display screen 3
Rate, the purpose disturbed sound pick-up outfit is reached with this, and the recording being interfered after treatment can not be by meeting
Speech content is separated, and be ensure that the confidential information of country, enterprise and individual, is prevented criminal from passing through certain equipment
Steal secret.
Fig. 2 is control unit STM32 circuit diagrams provided by the invention.
With reference to the signal and data handling procedure of the anti-phonographic recorder of low-and high-frequency for mini-session the present invention is made into
One step describes.
When pressing shift knob, equipment is active, and equipment is started working, and display screen is lighted, and each parameter is in
Init state；
Time setting button is pressed, starts the RTC clock program inside STM32, while display screen shows corresponding parameter,
By increasing and decreasing button on display screen accordingly, corresponding parameter is set, it may include operating frequency range, operating time, and fall
Timing is shown.
After the setting working time is reached, control system clock (internal or external crystal oscillator) is produced frequency by internal control signal
Rate source signal, signal is produced according to corresponding parameter；
Caused signal, frequency dividing and frequency multiplication are realized by the phaselocked loop of inside, the conversion of frequency is completed, passes through inside and outside crystal oscillator
Selection, then obtained signal is sent to by counter by certain frequency dividing/frequency multiplication；
By the addition of the parameter setting of the respective algorithms to counter, and SIN function, realize that frequency transformation is completed
Pwm signal exports, and realizes the signal output of different frequency.
After the working time of setting duration is completed, system is automatically stopped work, pass hull closure.
With reference to the control method of control unit, the invention will be further described.
As shown in figure 3, control unit can use the STM32 103RBTx of STM32 series, there is the multiplication on hardware and remove
Method one-cycle instruction, frequency source is produced using crystal oscillator inside or outside single-chip microcomputer, and pass through internal frequency dividing/frequency multiplication and counter
PWM outputs are produced, produce the signal output of corresponding frequencies.
With reference to the signal processing method of signal processing unit, the invention will be further described.
As shown in figure 4, signal processing unit produces the frequency of certain frequency using STM32 inside crystal oscillator or external crystal-controlled oscillation
Source signal, frequency dividing and frequency multiplication are realized by the phaselocked loop of inside, the conversion of frequency is completed, by the selection of inside and outside crystal oscillator, then leads to
Cross certain frequency dividing/frequency multiplication and obtained signal is sent to timer, by the parameter setting to timer, complete different frequency
Signal output.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (4)
1. the anti-phonographic recorder of a kind of low-and high-frequency for mini-session, it is characterised in that the low-and high-frequency for mini-session is anti-
Phonographic recorder sets control unit；The described control unit reduction of fractions to a common denominator does not set button, signal transacting with display screen, shift knob, time
Unit is electrically connected with；The signal processing unit is electrically connected with high-frequency emission unit, low frequencies unit respectively.
2. it is used for the anti-phonographic recorder of low-and high-frequency of mini-session as claimed in claim 1, it is characterised in that described to be used for mini-session
The anti-phonographic recorder of low-and high-frequency be additionally provided with power subsystem；The power subsystem connected respectively by wire control unit, display screen,
Shift knob, time setting button, signal processing unit, high-frequency emission unit, low frequencies unit；
The display screen is LED display.
3. it is used for the anti-phonographic recorder of low-and high-frequency of mini-session as claimed in claim 1, it is characterised in that described control unit utilizes
The single-chip microcomputer or external crystal-controlled oscillation that control unit is internally integrated produce frequency source, and are produced by internal frequency dividing/frequency multiplication and counter
Raw PWM outputs, produce the signal output of corresponding frequencies.
4. it is used for the anti-phonographic recorder of low-and high-frequency of mini-session as claimed in claim 1, it is characterised in that
The signal processing unit receives the control instruction from control unit, according to demand signals, calculates corresponding signal
Table, signal table is stored in ROM；Specifically include：Internal crystal oscillator or external crystal-controlled oscillation is used to produce frequency source signal first, according to
The frequency range given in corresponding control instruction, corresponding frequency dividing and Clock Multiplier Factor are provided, is completed at the frequency dividing or frequency multiplication of signal
Reason, enter the conversion of line frequency；By the selection of inside and outside crystal oscillator, obtained signal is sent to timer；Control unit is to timer
Parameter be configured, the corresponding information table stored in corresponding ROM is taken out in then control, makes each pulse of the output train of impulses wide
Degree presses each pulse change, desired signal is produced, for completing the signal output of different frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710953716.7A CN107547977A (en) | 2017-10-13 | 2017-10-13 | A kind of anti-phonographic recorder of low-and high-frequency for mini-session |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710953716.7A CN107547977A (en) | 2017-10-13 | 2017-10-13 | A kind of anti-phonographic recorder of low-and high-frequency for mini-session |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023123454A1 (en) * | 2021-12-31 | 2023-07-06 | 深圳市安卫普科技有限公司 | Interference apparatus |
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| JPS633521A (en) * | 1986-06-24 | 1988-01-08 | Matsushita Electric Ind Co Ltd | Signal processing method |
| DE102005034289A1 (en) * | 2005-07-22 | 2007-02-01 | Efe Elektronik-Forschungs- Und Entwicklungsgesellschaft Mbh | Radio link monitoring and interrupting method for use between e.g. mobile telephone and e.g. universal mobile telecommunication system, involves transmitting interfering signal in receiving-frequency range during existence of signals |
| CN203243413U (en) * | 2013-04-28 | 2013-10-16 | 黑龙江工程学院 | Anti-eavesdropping and recording blocker device |
| CN105306162A (en) * | 2015-10-29 | 2016-02-03 | 天津光电安辰信息技术有限公司 | Mixing-based recording shielding device and realizing method thereof |
| CN105827357A (en) * | 2016-05-24 | 2016-08-03 | 广东电网有限责任公司信息中心 | Voice recording shielding device and voice recording shielding method |
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| CN106658285A (en) * | 2016-10-21 | 2017-05-10 | 天津市英讯科技有限公司 | Miniature frequency-mixing and recording isolator |
| CN206195795U (en) * | 2016-11-08 | 2017-05-24 | 天津光电安辰信息技术股份有限公司 | Recording shield of low frequency |
| CN207340170U (en) * | 2017-10-13 | 2018-05-08 | 成都信息工程大学 | A kind of anti-phonographic recorder of low-and high-frequency for mini-session |
-
2017
- 2017-10-13 CN CN201710953716.7A patent/CN107547977A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3939485A (en) * | 1974-02-18 | 1976-02-17 | Sony Corporation | Magnetic recording and/or reproducing system |
| JPS633521A (en) * | 1986-06-24 | 1988-01-08 | Matsushita Electric Ind Co Ltd | Signal processing method |
| DE102005034289A1 (en) * | 2005-07-22 | 2007-02-01 | Efe Elektronik-Forschungs- Und Entwicklungsgesellschaft Mbh | Radio link monitoring and interrupting method for use between e.g. mobile telephone and e.g. universal mobile telecommunication system, involves transmitting interfering signal in receiving-frequency range during existence of signals |
| CN203243413U (en) * | 2013-04-28 | 2013-10-16 | 黑龙江工程学院 | Anti-eavesdropping and recording blocker device |
| WO2016153149A2 (en) * | 2015-03-26 | 2016-09-29 | 주식회사 쉴드케이 | Auditory information security system |
| CN105306162A (en) * | 2015-10-29 | 2016-02-03 | 天津光电安辰信息技术有限公司 | Mixing-based recording shielding device and realizing method thereof |
| CN105827357A (en) * | 2016-05-24 | 2016-08-03 | 广东电网有限责任公司信息中心 | Voice recording shielding device and voice recording shielding method |
| CN106658285A (en) * | 2016-10-21 | 2017-05-10 | 天津市英讯科技有限公司 | Miniature frequency-mixing and recording isolator |
| CN206195795U (en) * | 2016-11-08 | 2017-05-24 | 天津光电安辰信息技术股份有限公司 | Recording shield of low frequency |
| CN207340170U (en) * | 2017-10-13 | 2018-05-08 | 成都信息工程大学 | A kind of anti-phonographic recorder of low-and high-frequency for mini-session |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023123454A1 (en) * | 2021-12-31 | 2023-07-06 | 深圳市安卫普科技有限公司 | Interference apparatus |
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Application publication date: 20180105 |