CN106059706A - Mixed sound recording blocker - Google Patents

Mixed sound recording blocker Download PDF

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Publication number
CN106059706A
CN106059706A CN201610353691.2A CN201610353691A CN106059706A CN 106059706 A CN106059706 A CN 106059706A CN 201610353691 A CN201610353691 A CN 201610353691A CN 106059706 A CN106059706 A CN 106059706A
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China
Prior art keywords
unit
noise
frequency
shielding device
signal
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CN201610353691.2A
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CN106059706B (en
Inventor
高尚
黄恺彤
曾初阳
黄巨涛
肖建毅
黄剑文
何旻诺
马瑞雯
林强
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Information Center of Guangdong Power Grid Co Ltd
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Information Center of Guangdong Power Grid Co Ltd
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04KSECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00Jamming of communication; Counter-measures
    • H04K3/80Jamming or countermeasure characterized by its function
    • H04K3/82Jamming or countermeasure characterized by its function related to preventing surveillance, interception or detection
    • H04K3/825Jamming or countermeasure characterized by its function related to preventing surveillance, interception or detection by jamming
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04KSECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00Jamming of communication; Counter-measures
    • H04K3/60Jamming involving special techniques
    • H04K3/62Jamming involving special techniques by exposing communication, processing or storing systems to electromagnetic wave radiation, e.g. causing disturbance, disruption or damage of electronic circuits, or causing external injection of faults in the information

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Noise Elimination (AREA)

Abstract

The invention discloses a mixed sound recording blocker comprising a power unit, a control unit, a modulation unit, a noise unit, a high-frequency emission unit, a radio frequency unit, a power amplifier unit, a PTZ unit, and an electromagnetic pulse unit. The noise unit includes a white noise generator and a pink noise generator. The mixed sound recording blocker of the invention adopts ultra-low-frequency emission, the receiver of an acoustic sensor is blocked directly, so that the receiver cannot extract or restore received audio signals after saturation, and no harm is brought to the human body or the environment. An effective noise source is selected, and the noise source is modulated in multiple modulation modes so the modulated noise is irregular. An effective means of emission is adopted to meet the following requirements: the emission distance is as far as possible, the spectral coverage is as large as possible, and the saturation effect is as good as possible.

Description

A kind of mixing sound wave recording shielding device
Technical field
The present invention relates to monitoring or the device technique field of monitoring telecommunication, relate generally to a kind of mixing sound wave 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.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of new mixing sound wave recording shielding Device, effectively can disturb sound pick-up outfit so that it is can not realize recording normally.
Technical scheme is as follows:
A kind of mixing sound wave 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 needs with other Unit to be powered is connected, for needing the unit of power supply to provide power supply for other;Described control unit and element of noise defeated Going out end to be connected with the input of modulating unit respectively, control unit is used for generating carrier signal and sending carrier signal to modulation Unit, element of noise is used for generating noise;The outfan of described modulating unit respectively with high-frequency emission unit, less radio-frequency list Unit, the input of power amplifier unit are connected, and noise, for carrier signal is added noise, is modulated by described modulating unit;High Frequently transmitter unit is for receiving the waveform of modulating unit output and launching HF noise signal, and described radio frequency units is used for connecing Receive the waveform of modulating unit output and launch less radio-frequency noise signal;The outfan of power amplifier unit respectively with PTZ unit and electricity The input of magnetic field impulse unit is connected, and power amplifier unit sends after being used for receiving the waveform of modulating unit output and carrying out power amplification To PTZ unit and electromagnetic pulse unit, PTZ unit is used for receiving the waveform of power amplifier unit and launching low-frequency noise signal, electromagnetism Pulse unit is for receiving the waveform of power amplifier unit and launching electromagnetic pulse interference signal;Described element of noise includes that white noise is sent out Raw device and pink noise generator.
Described mixing sound wave recording shielding device, wherein, control unit is single-chip microcomputer, and the carrier signal of generation includes sine In ripple, triangular wave, square wave and narrow pulse signal one or more.
Described mixing sound wave recording shielding device, wherein, the modulation system of modulating unit includes that amplitude modulation(PAM), frequency are adjusted One or more in system, phase-modulation.
Described mixing sound wave recording shielding device, wherein, the resonant frequency of piezoelectric ceramic transducer is located at more than 16KHz.
Described mixing sound wave recording shielding device, wherein, the dominant frequency of electromagnetic pulse unit be arranged on 10KHz~20KHz it Between.
Described mixing sound wave recording shielding device, wherein, the radiation radius of electromagnetic pulse unit is set to 5 meters.
Beneficial effect: the present invention mixes sound wave recording shielding device and uses intrasonic to launch, and directly blocks connecing of sonic transducer Receiving end so that it is cannot extract and recover received sound signal after saturated, and bring will not to human body and environment simultaneously Harm.Choose effective noise source (including white noise and pink noise), noise source is used Different Modulations, after making modulation Noise source irregular seek, and use effective radiation pattern, to reach, transmitting range is the most remote, spectral coverage is most The requirements such as amount is big, saturation effect is the best.
Accompanying drawing explanation
Fig. 1 is the functional block diagram that the present invention mixes sound wave 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
The present invention provides a kind of mixing sound wave recording shielding device, for making the purpose of the present invention, technical scheme and effect more Clear, clear and definite, the present invention is described in more detail below.Should be appreciated that specific embodiment described herein only in order to Explain the present invention, be not intended to limit the present invention.
Mixing sound wave provided by the present invention recording shielding device, as it is shown in figure 1, include power subsystem, control unit, modulation Unit, element of noise, high-frequency emission unit, radio frequency units, power amplifier unit, PTZ unit (piezoelectric ceramics transducing unit) and Electromagnetic pulse unit;The unit that described power subsystem needs power supply with other is connected, and provides electricity for other unit needing power supply Source;Described control unit is connected with the input of modulating unit respectively with the outfan of element of noise, and control unit is used for generating Carrier signal is also sent to modulating unit by carrier signal, and element of noise is used for generating noise;The outfan of described modulating unit Being connected with high-frequency emission unit, radio frequency units, the input of power amplifier unit respectively, described modulating unit is for believing carrier wave Number add noise, noise is modulated;High-frequency emission unit is used for receiving the waveform of modulating unit output and launching high frequency making an uproar Acoustical signal, described radio frequency units is for receiving the waveform of modulating unit output and launching less radio-frequency noise signal;Power amplifier The outfan of unit input with PTZ unit and electromagnetic pulse unit respectively is connected, and power amplifier unit is used for receiving modulating unit The waveform of output is also sent to PTZ unit and electromagnetic pulse unit after carrying out power amplification, and PTZ unit is used for receiving power amplifier unit Waveform and launch low-frequency noise signal, electromagnetic pulse unit is for receiving the waveform of power amplifier unit and launch electromagnetic pulse interference Signal.Described control unit is single-chip microcomputer, can produce any one signals such as sine wave, triangular wave, square wave and narrow pulse signal. Described element of noise includes white noise generator and pink noise generator.
Noise is divided into white noise, pink noise, blue noise etc., and the present invention mixes sound wave recording shielding device and selects to make an uproar at random Sound is commonly called white noise as interference noise source, random noise.When interfering process power density gives timing, and white noise has Maximum masking characteristics, its probability-distribution function is multiple normal distribution.Therefore, the most described element of noise For white noise generating unit.For increasing the complexity of interference source, this equipment also uses pink noise.
In order to effectively utilize jamming resource, it is desirable to noise spectrum is limited in certain scope, however any Noise source (includes that the present invention mixes the white noise that sound wave recording shielding device is selected), although its spectral range is the widest, and exactly exists It is the lowest that the present invention mixes sound wave recording shielding device its power spectral density of desired low-frequency range.Make an uproar to obtain satisfied low frequency Sound, can move noise frequency so that it is become the low-frequency noise started from 10Hz.
Specifically, the present invention mixes sound wave recording shielding device and uses intrasonic to launch, and directly blocks the reception of sonic transducer End so that it is cannot extract and recover received sound signal after saturated, and bring danger will not to human body and environment simultaneously Evil.Choose effective noise source, noise source is used Different Modulations, makes that the noise source after modulation is irregular to be sought, and adopt Use effective radiation pattern, with reach transmitting range as far as possible remote, spectral coverage is the biggest, saturation effect is the best etc. wants Ask.
To white noise, pink noise both noise sources use three kinds interference modulation systems: amplitude modulation(PAM), frequency modulation(PFM), Phase-modulation, and modulation system and combinations thereof is random, irregular, make sensor saturated, the language that i.e. sonic transducer receives Cannot extract and recover after the disturbed obstruction of tone signal.The present invention mixes noise-modulated carrier signal in sound wave recording shielding device Any one signals such as sine wave, triangular wave, square wave and narrow pulse signal can be used.Modulation to noise uses amplitude, frequency With the compound modulation of phase place, use three kinds of modulation systems can obtain optimal interference effect simultaneously.Interference spectrum relative to Carrier frequency is symmetrical, and interference band is equal to the twice of modulation spectrum bandwidth.In the case of modulation depth strengthens, when amplitude limit occurring with excessive During modulation, owing to there being combination component, interference spectrum is slightly widened.So, amplitude modulation(PAM) noise spectrum is completely by zoop Frequency spectrum determines.
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, the present invention mixes sound wave recording shielding device and the resonant frequency of piezoelectric ceramic transducer is located at more than 16KHz.
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.
The present invention mixes sound wave recording shielding device and uses 6V~24V DC source to power, and is with white noise and pink noise As modulated signals, using sine wave, triangular wave, square wave, burst pulse as permutation and combination during carrier wave.The present invention mixes sound wave The work process of recording shielding device is, noise (including white noise and pink noise) signal and single-chip microcomputer that element of noise produces produce Raw carrier signal, after the hybrid modulation that modulating unit carries out amplitude modulation, frequency modulation, phase modulation, is divided into three parts;A part is given The noise inputs end of high-frequency emission unit, i.e. radio circuit part, directly launched HF noise signal, covered by radio circuit With signal, thus interference and block normal recording;Noise signal after part modulation is through radio frequency units (miniature low-power consumption Module FM-1505) to launch, its radio-frequency region is 70MHz~110MHz, only gets final product long-term work, diameter with one piece of button cell For 10mm, thickness is only 2.5mm, and the trimmer of external 20pF can change its tranmitting frequency, and transmitting range is more than 30 meters; Noise signal after part modulation, after power amplifier unit carries out power amplification, drives PZT unit and electromagnetic pulse unit 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, white noise can have chosen On the basis of, it is possible to use wave filter, white noise, the constant energy of i.e. every hertz, is transformed into the constant energy of every octave Pink noise.And realize pink noise with wave filter and also can reduce the low frequency wonder of noise signal.Filter circuit is such as Shown in Fig. 2, therefore, the present invention mixes sound wave recording shielding device and also includes that a wave filter, described wave filter are connected with element of noise. This wave filter covers the audiorange of 10Hz~20KHz, utilizes three pole operational amplifiers, it is possible to provide every ten octave-20dB Transmission characteristic, and frequency characteristic is unrelated with source impedance and load impedance.The white noise obtained and the time domain ripple of pink noise In shape such as Fig. 3 shown in (a) and (b).
It should be appreciated that the application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can To be improved according to the above description or to convert, all these modifications and variations all should belong to the guarantor of claims of the present invention Protect scope.

Claims (6)

1. a mixing sound wave recording shielding device, it is characterised in that include power subsystem, control unit, modulating unit, noise list Unit, high-frequency emission unit, radio frequency units, power amplifier unit, PTZ unit and electromagnetic pulse unit;Described power subsystem and its He needs the unit of power supply to be connected, for needing the unit of power supply to provide power supply for other;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, less radio-frequency Unit, the input of power amplifier unit are connected, and noise, for carrier signal is added noise, is modulated by described modulating unit; High-frequency emission unit is for receiving the waveform of modulating unit output and launching HF noise signal, and described radio frequency units is used for Receive the waveform of modulating unit output and launch less radio-frequency noise signal;The outfan of power amplifier unit respectively with PTZ unit and The input of electromagnetic pulse unit is connected, and power amplifier unit is sent out after being used for receiving the waveform of modulating unit output and carrying out power amplification Giving PTZ unit and electromagnetic pulse unit, PTZ unit is for receiving the waveform of power amplifier unit and launching low-frequency noise signal, electric Magnetic field impulse unit is for receiving the waveform of power amplifier unit and launching electromagnetic pulse interference signal;Described element of noise includes white noise Generator and pink noise generator.
Mixing sound wave the most according to claim 1 recording shielding device, it is characterised in that control unit is single-chip microcomputer, generates Carrier signal include one or more in sine wave, triangular wave, square wave and narrow pulse signal.
Mixing sound wave the most according to claim 1 recording shielding device, it is characterised in that the modulation system of modulating unit includes One or more in amplitude modulation(PAM), frequency modulation(PFM), phase-modulation.
Mixing sound wave the most according to claim 1 recording shielding device, it is characterised in that the resonance frequency of piezoelectric ceramic transducer Rate is located at more than 16KHz.
Mixing sound wave the most according to claim 1 recording shielding device, it is characterised in that the dominant frequency of electromagnetic pulse unit is arranged Between 10KHz~20KHz.
Mixing sound wave the most according to claim 1 recording shielding device, it is characterised in that the radiation radius of electromagnetic pulse unit It is set to 5 meters.
CN201610353691.2A 2016-05-24 2016-05-24 A kind of mixing sound wave recording shielding device Active CN106059706B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109147795A (en) * 2018-08-06 2019-01-04 珠海全志科技股份有限公司 Voice print database transmission, recognition methods, identification device and storage medium
CN110190825A (en) * 2019-06-28 2019-08-30 南通东峘电子科技有限公司 The harmonious sonic apparatus of low frequency

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WO2006100147A1 (en) * 2005-03-24 2006-09-28 Robert Bosch Gmbh Method for damping a high-frequency radiation of a clocked system
CN102594483A (en) * 2012-03-08 2012-07-18 南京泰之联无线科技有限公司 Full-band examination place radio signal shielding device
CN103248980A (en) * 2013-05-15 2013-08-14 中国人民解放军国防科学技术大学 Method and device for generating low-frequency sound wave
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
CN205142236U (en) * 2015-10-29 2016-04-06 天津光电安辰信息技术有限公司 Recording shield assembly of mixing

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006100147A1 (en) * 2005-03-24 2006-09-28 Robert Bosch Gmbh Method for damping a high-frequency radiation of a clocked system
CN102594483A (en) * 2012-03-08 2012-07-18 南京泰之联无线科技有限公司 Full-band examination place radio signal shielding device
CN103248980A (en) * 2013-05-15 2013-08-14 中国人民解放军国防科学技术大学 Method and device for generating low-frequency sound wave
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
CN205142236U (en) * 2015-10-29 2016-04-06 天津光电安辰信息技术有限公司 Recording shield assembly of mixing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109147795A (en) * 2018-08-06 2019-01-04 珠海全志科技股份有限公司 Voice print database transmission, recognition methods, identification device and storage medium
CN110190825A (en) * 2019-06-28 2019-08-30 南通东峘电子科技有限公司 The harmonious sonic apparatus of low frequency
CN110190825B (en) * 2019-06-28 2023-08-15 南通东峘电子科技有限公司 Low frequency harmonic wave instrument

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