CN205754367U - A kind of recording shielding device - Google Patents
A kind of recording shielding device Download PDFInfo
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- CN205754367U CN205754367U CN201620483815.4U CN201620483815U CN205754367U CN 205754367 U CN205754367 U CN 205754367U CN 201620483815 U CN201620483815 U CN 201620483815U CN 205754367 U CN205754367 U CN 205754367U
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Abstract
This utility model open one recording shielding device, including power subsystem, control unit, modulating unit, element of noise, high-frequency emission unit, radio frequency units, power amplifier unit, PTZ unit and electromagnetic pulse unit.This utility model recording shielding device uses intrasonic to launch, and directly blocks the receiving terminal of sonic transducer so that it is cannot extract and recover received sound signal after saturated, and bring harm will not to human body and environment simultaneously.Choose effective noise source, noise source is used Different Modulations, makes that the noise source after modulation is irregular to be sought, and use effective radiation pattern, to reach the requirements such as transmitting range is the most remote, spectral coverage is the biggest, saturation effect is the best.
Description
Technical field
This utility model relates to monitoring or the device technique field of monitoring telecommunication, relates generally to a kind of recording shielding device.
Background technology
Currently developing rapidly along with science and technology, electronic product universal, and the miniaturization of electronic product, individual with
And threat that public information security is subject to is the most increasing.Some lawless person is by mobile phone, recording pen or other specialty
Property stronger miniature interception facility, illegally steal individual privacy, business secret even state secret, so that individual, enterprise
Industry suffers economic loss, more even makes nation's security be on the hazard.
Present most sound pick-up outfit all gathers voice signal by acoustoelectric sensor, and the propagation of sound is one
Plant mechanical wave, propagate in atmosphere by vibration.Acoustoelectric sensor gathers signal by sensing this vibration；If
In sound pick-up outfit work process, the vibrating reed of acoustoelectric sensor is made to sense a kind of irregular similar white noise by certain device
The vibration of sound, and not heard by human ear so that sound pick-up outfit can only record a kind of noise, and people's one's voice in speech by
Thoroughly interference can not be separated；Thus it is effectively accomplished the effect of recording interference.
Therefore, prior art has yet to be improved and developed.
Utility model content
In view of above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide a kind of new recording shielding device, can
So that sound pick-up outfit is effectively disturbed so that it is recording can not be realized normally.
The technical solution of the utility model is as follows:
A kind of recording shielding device, wherein, including power subsystem, control unit, modulating unit, element of noise, high-frequency emission
Unit, radio frequency units, power amplifier unit, PTZ unit and electromagnetic pulse unit；Described power subsystem and control unit, modulation
Unit, element of noise, high-frequency emission unit, radio frequency units, power amplifier unit, PTZ unit are connected with electromagnetic pulse unit, use
In for control unit, modulating unit, element of noise, high-frequency emission unit, radio frequency units, power amplifier unit, PTZ unit and electricity
Magnetic field impulse unit provides power supply；Described control unit is connected with the input of modulating unit respectively with the outfan of element of noise,
Control unit is used for generating carrier signal and sending carrier signal to modulating unit, and element of noise is used for generating noise；Described
The outfan of modulating unit is connected with high-frequency emission unit, radio frequency units, the input of power amplifier unit respectively, described modulation
Noise, for carrier signal is added noise, is modulated by unit；High-frequency emission unit is for receiving modulating unit output
Waveform also launches HF noise signal, and described radio frequency units is for receiving the waveform of modulating unit output and launching wireless penetrating
Frequently noise signal；The outfan of power amplifier unit input with PTZ unit and electromagnetic pulse unit respectively is connected, and power amplifier unit is used
In receiving the waveform of modulating unit output and being sent to PTZ unit and electromagnetic pulse unit after carrying out power amplification, PTZ unit is used
In receiving the waveform of power amplifier unit and launching low-frequency noise signal, electromagnetic pulse unit is concurrent for the waveform receiving power amplifier unit
Penetrate electromagnetic pulse interference signal.
Described recording shielding device, wherein, control unit is single-chip microcomputer, and the carrier signal of generation includes sine wave, triangle
In ripple, square wave and narrow pulse signal one or more.
Described recording shielding device, wherein, the modulation system of modulating unit includes that amplitude modulation(PAM), frequency modulation(PFM), phase place are adjusted
One or more in system.
Described recording shielding device, wherein, the resonant frequency of piezoelectric ceramic transducer is located at more than 16KHz.
Described recording shielding device, wherein, the dominant frequency of electromagnetic pulse unit is arranged between 10KHz～20KHz.
Described recording shielding device, wherein, the radiation radius of electromagnetic pulse unit is set to 5 meters.
Described recording shielding device, wherein, element of noise is white noise generator.
Described recording shielding device, wherein, element of noise is connected with wave filter, is used for generating pink noise.
Beneficial effect: this utility model recording shielding device uses intrasonic to launch, and directly blocks the receiving terminal of sonic transducer,
Cannot extract and recover received sound signal after making it saturated, and bring harm will not to human body and environment simultaneously.
Choose effective noise source, noise source is used Different Modulations, makes that the noise source after modulation is irregular to be sought, and use row
Effective radiation pattern, to reach transmitting range as far as possible remote, the requirement such as spectral coverage is the biggest, saturation effect is the best.
Accompanying drawing explanation
Fig. 1 is the functional block diagram of this utility model recording shielding device.
Fig. 2 is filter circuit figure.
Fig. 3 is the time domain waveform of white noise and pink noise.
Detailed description of the invention
This utility model provides one recording shielding device, for making the purpose of this utility model, technical scheme and effect more
Clear, clear and definite, below this utility model is further described.Only should be appreciated that specific embodiment described herein
In order to explain this utility model, it is not used to limit this utility model.
Recording shielding device provided by the utility model, as it is shown in figure 1, include power subsystem, control unit, modulation list
Unit, element of noise, high-frequency emission unit, radio frequency units, power amplifier unit, PTZ unit (piezoelectric ceramics transducing unit) and electricity
Magnetic field impulse unit；Described power subsystem and control unit, modulating unit, element of noise, high-frequency emission unit, less radio-frequency list
Unit, power amplifier unit, PTZ unit are connected with electromagnetic pulse unit, for control unit, modulating unit, element of noise, high-frequency emission list
Unit, radio frequency units, power amplifier unit, PTZ unit and electromagnetic pulse unit provide power supply；Described control unit and element of noise
Outfan be connected with the input of modulating unit respectively, control unit is used for generating carrier signal and carrier signal is sent extremely
Modulating unit, element of noise is used for generating noise；The outfan of described modulating unit respectively with high-frequency emission unit, wireless penetrate
Frequently unit, the input of power amplifier unit are connected, and noise, for carrier signal is added noise, is adjusted by described modulating unit
System；High-frequency emission unit is used for receiving the waveform of modulating unit output and launching HF noise signal, described radio frequency units
For receiving the waveform of modulating unit output and launching less radio-frequency noise signal；The outfan of power amplifier unit is mono-with PTZ respectively
Unit is connected with the input of electromagnetic pulse unit, and power amplifier unit is for receiving the waveform of modulating unit output and carrying out power amplification
After be sent to PTZ unit and electromagnetic pulse unit, PTZ unit for receive power amplifier unit waveform and launch low-frequency noise letter
Number, electromagnetic pulse unit is for receiving the waveform of power amplifier unit and launching electromagnetic pulse interference signal.Described control unit is single
Sheet machine, can produce any one signals such as sine wave, triangular wave, square wave and narrow pulse signal.
Noise is divided into white noise, pink noise, blue noise etc., this utility model recording shielding device to select random noise to make
For interference noise source, random noise is commonly called white noise.When interfering process power density gives timing, and white noise has maximum
Masking characteristics, its probability-distribution function is multiple normal distribution.Therefore, element of noise described in this utility model embodiment
For white noise generating unit.
In order to effectively utilize jamming resource, it is desirable to noise spectrum is limited in certain scope, however any
Noise source (includes the white noise that this utility model recording shielding device is selected), although its spectral range is the widest, and exactly in this reality
The lowest by Novel recording shielding device its power spectral density of desired low-frequency range.In order to obtain satisfied low-frequency noise, can be by
Noise frequency is moved so that it is become the low-frequency noise started from 10Hz.
Specifically, this utility model recording shielding device uses intrasonic to launch, and directly blocks the receiving terminal of sonic transducer, makes
Cannot extract and recover received sound signal after it is saturated, and bring harm will not to human body and environment simultaneously.Choosing
Take effective noise source, noise source is used Different Modulations, makes that the noise source after modulation is irregular to be sought, and use row
Effectively radiation pattern, to reach the requirements such as transmitting range is the most remote, spectral coverage is the biggest, saturation effect is the best.
Three kinds of interference modulation systems of noise source this to white noise employing: amplitude modulation(PAM), frequency modulation(PFM), phase-modulation, and
Modulation system and combinations thereof is random, irregular, makes sensor saturated, and the voice signal that i.e. sonic transducer receives is done
Cannot extract and recover after interference resistance plug.This utility model recording shielding device in noise-modulated carrier signal can use sine wave,
Any one signals such as triangular wave, square wave and narrow pulse signal.The mixing that noise is modulated employing amplitude, frequency and phase place is adjusted
Mode processed, uses three kinds of modulation systems can obtain optimal interference effect simultaneously.Interference spectrum is symmetrical relative to carrier frequency, interference frequency
Band is equal to the twice of modulation spectrum bandwidth.In the case of modulation depth strengthens, when amplitude limit occurring and excessively modulating, owing to there being group
Closing component, interference spectrum is slightly widened.So, amplitude modulation(PAM) noise spectrum is determined by the frequency spectrum of zoop completely.
About transducer, as the piezoelectric ceramic transducer of extremely low frequency discharger, its operating frequency is preferably at low frequency
At 2KHz～5KHz, because the voice of this section of frequency band is the abundantest, but this section of frequency band part that to be also human ear most sensitive, in order to reduce
Stimulation to human body, this utility model recording shielding device is located at more than 16KHz the resonant frequency of piezoelectric ceramic transducer.
About the launching technique of interference signal, the low frequency electromagnetic pulse of employing, wherein most energy concentrates on 100KHz
Hereinafter, dominant frequency is between 10KHz～20KHz, and its emitted energy is relatively low, human body will not be produced harm.
About electromagnetic pulse, microelectronic device, the interference of device and impact, the interference threshold of electromagnetic pulse field are about
1.3KV/m, damage threshold is about 40KV/m.Low frequency electromagnetic pulse employed in this equipment, it is contemplated that to electric, electronics around
The impact of equipment, it is less that it launches power, thus radiation scope is limited, radiation radius about about 5 meters.
About the parameter of active antenna, active antenna parameter is to strengthen the radiation effect of electromagnetic impulse source, need to use antenna.
And the bandwidth of antenna is typically in difference (i.e. altofrequency and low-frequency difference of frequency corresponding to mid frequency two side draw half power points
Value).Electric field intensity and the calculating of radiant power:
The radius taking sonic transducer is 1.5mm, then radiant power P5 received on sonic transducer at distance radiation source 5m:
P5=π r2×PW=3.675 × 10-6(W)。
The undistorted maximum output voltage of sonic transducer is 4.2V, input impedance > 5M Ω, the then output work on sonic transducer
Rate Pout≤3.528×10-6(W), so having: Pout＜ P5, the radiation scope of this equipment is at about 5 meters.
To enhanced rad effect, radiant power can be improved, or suitably increase antenna length.Other spoke can also be selected
Penetrate that effect is more preferable, the broader antenna of frequency band.Choosing and the calculating of radiation field by active antenna, shows electrical dipole antenna
In the plane be perpendicular to pole axis, radiation effect is the strongest, and field intensity is zero on pole axis.And the radiant power improving antenna can
Expand radiation scope and the effect of noise jamming model machine.
This utility model recording shielding device uses 6V～24V DC source to power, and is using white noise as modulated signals,
Using sine wave, triangular wave, square wave, burst pulse as permutation and combination during carrier wave.This utility model recording shields the worked of device
Cheng Wei, the carrier signal that noise (white noise) signal of element of noise generation and single-chip microcomputer produce, adjust through modulating unit
Width, frequency modulation, phase modulation hybrid modulation after, be divided into three part；A part gives the noise inputs end of high-frequency emission unit, i.e. radio frequency
Circuit part, is directly launched HF noise signal by radio circuit, covers useful signal, thus disturbs and block normal recording；
Noise signal after part modulation is launched through radio frequency units (miniature low-power consumption module FM-1505), and its radio-frequency region is
70MHz～110MHz, only gets final product long-term work, a diameter of 10mm with one piece of button cell, and thickness is only 2.5mm, and can be external
The trimmer of 20pF changes its tranmitting frequency, and transmitting range is more than 30 meters；Noise signal after part modulation is through power amplifier
After unit carries out power amplification, PZT unit and electromagnetic pulse unit is driven to launch low frequency signal and electromagnetic pulse signal.
About the realization of frequency shift wave filter, for increasing the complexity of interference noise source, have chosen the base of white noise
On plinth, it is possible to use wave filter, white noise, the constant energy of i.e. every hertz, is transformed into the powder of the constant energy of every octave
Red noise.And realize pink noise with wave filter and also can reduce the low frequency wonder of noise signal.Filter circuit such as Fig. 2 institute
Showing, therefore, this utility model recording shielding device also includes that a wave filter, described wave filter are connected with element of noise.This wave filter
Cover the audiorange of 10Hz～20KHz, utilize three pole operational amplifiers, it is possible to provide the transmission of every ten octave-20dB
Characteristic, and frequency characteristic is unrelated with source impedance and load impedance.The white noise obtained and the time domain waveform of pink noise such as Fig. 3
In shown in (a) and (b).
It should be appreciated that application of the present utility model is not limited to above-mentioned citing, those of ordinary skill in the art are come
Saying, can be improved according to the above description or convert, all these modifications and variations all should belong to the appended power of this utility model
The protection domain that profit requires.
Claims (6)
1. a recording shielding device, it is characterised in that include power subsystem, control unit, modulating unit, element of noise, high frequency
Transmitter unit, radio frequency units, power amplifier unit, PTZ unit and electromagnetic pulse unit；Described power subsystem and control unit,
Modulating unit, element of noise, high-frequency emission unit, radio frequency units, power amplifier unit, PTZ unit and electromagnetic pulse unit phase
Even, for mono-for control unit, modulating unit, element of noise, high-frequency emission unit, radio frequency units, power amplifier unit, PTZ
Unit and electromagnetic pulse unit provide power supply；The outfan of described control unit and element of noise respectively with the input of modulating unit
Being connected, control unit is used for generating carrier signal and sending carrier signal to modulating unit, and element of noise is used for generating noise；
The outfan of described modulating unit is connected with high-frequency emission unit, radio frequency units, the input of power amplifier unit respectively, described
Noise, for carrier signal is added noise, is modulated by modulating unit；It is defeated that high-frequency emission unit is used for receiving modulating unit
The waveform that goes out also launches HF noise signal, and described radio frequency units is for receiving the waveform of modulating unit output and launching nothing
Line radio noise signal；The outfan of power amplifier unit input with PTZ unit and electromagnetic pulse unit respectively is connected, power amplifier list
Unit is sent to PTZ unit and electromagnetic pulse unit after being used for receiving the waveform of modulating unit output and carrying out power amplification, and PTZ is mono-
Unit is for receiving the waveform of power amplifier unit and launching low-frequency noise signal, and electromagnetic pulse unit is for receiving the waveform of power amplifier unit
And launch electromagnetic pulse interference signal.
Recording shielding device the most according to claim 1, it is characterised in that the resonant frequency of piezoelectric ceramic transducer is located at
More than 16KHz.
Recording shielding device the most according to claim 1, it is characterised in that the dominant frequency of electromagnetic pulse unit is arranged on 10KHz
～between 20KHz.
Recording shielding device the most according to claim 1, it is characterised in that the radiation radius of electromagnetic pulse unit is set to 5
Rice.
5. according to the arbitrary described recording shielding device of Claims 1 to 4, it is characterised in that element of noise is white noise generator.
Recording shielding device the most according to claim 5, it is characterised in that recording shielding device also includes one for generating powder
The wave filter of red noise, element of noise is connected with wave filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620483815.4U CN205754367U (en) | 2016-05-24 | 2016-05-24 | A kind of recording shielding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620483815.4U CN205754367U (en) | 2016-05-24 | 2016-05-24 | A kind of recording shielding device |
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| Publication Number | Publication Date |
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| CN205754367U true CN205754367U (en) | 2016-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620483815.4U Active CN205754367U (en) | 2016-05-24 | 2016-05-24 | A kind of recording shielding device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2016
- 2016-05-24 CN CN201620483815.4U patent/CN205754367U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105827357B (en) * | 2016-05-24 | 2018-07-27 | 广东电网有限责任公司信息中心 | A kind of recording shielding device and screen method of recording |
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