CN102685640B - Anti-secret leakage device for passive sound box - Google Patents
Anti-secret leakage device for passive sound box Download PDFInfo
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- CN102685640B CN102685640B CN201210158087.6A CN201210158087A CN102685640B CN 102685640 B CN102685640 B CN 102685640B CN 201210158087 A CN201210158087 A CN 201210158087A CN 102685640 B CN102685640 B CN 102685640B
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- 230000005236 sound signal Effects 0.000 claims abstract description 104
- 230000005540 biological transmission Effects 0.000 claims abstract description 26
- 239000000284 extract Substances 0.000 claims abstract description 7
- 230000003321 amplification Effects 0.000 claims description 24
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 11
- 230000000087 stabilizing effect Effects 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000000694 effects Effects 0.000 abstract description 7
- 230000001681 protective effect Effects 0.000 abstract description 4
- 230000035945 sensitivity Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001012 protector Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
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Abstract
The invention discloses a kind of Anti-secret leakage device for passive sound box, comprise power transfer module, audio signal identification module, control module and circuit on-off device, described power transfer module and audible transmission connection extract audio signal, and audio signal is converted to direct voltage and is respectively audio signal identification module, circuit on-off control module and circuit on-off device are powered, audio signal identification module obtains audio signal from audible transmission circuit and audio signal is sent to control module, control module switches on and off according to the uncontrolled line break-make device that has of audio signal, circuit on-off device is connected with the loud speaker of sound equipment.After adopting the present invention; when sound equipment does not play music or voice due to a variety of causes; sound equipment and circuit are in off-state; sound equipment is made to lose " pickup " effect; once circuit has audio signal, automatically connect sound equipment immediately, do not affect the normal use of sound equipment; thus serve protective effect, prevent and divulge a secret.
Description
Technical field
The present invention relates to a kind of audio protector, particularly relate to and a kind ofly prevent information by sound equipment by the Anti-secret leakage device for passive sound box of divulging a secret.
Background technology
Along with the material and cultural life of people improves day by day.Work, the life style of people also there occurs radical change, usually with while amusement and recreation, carry out a few thing interchange and commercial activity.If the places such as hotel, hotel, restaurant, teahouse are the places to go that people select party, business negotiation, leisure, amusement.Nature, can't do without carry out of beautiful music along with these activities.The loud speaker of sound equipment is not when having audio signal to export, it is exactly a pick-up, all sound signals in place can be converted to the signal of telecommunication to propagate at transmission line, and produce electromagnetic radiation, away from 10 meters, place, receiver only need do and simply amplify process, just clearly can hear conversation content; Loud speaker becomes fearful tapping device! Generally, the sound equipment playing music is not controlled especially, at this moment, the activities such as various business negotiation, secret negotiations, conclave are carried out as people, the content that people talk, is just easily propagated by other people eavesdropping by sound equipment, causes huge loss and is difficult to the result expected.So sound equipment is caused to the protection of divulging a secret, we can not be ignored.Due to acoustic product be just widely applied to we work, in life, and corresponding security product, almost nil at present.Therefore, prevent in these place secret leakings, very urgent.
In order to solve the problem; patentee proposes on December 18th, 2008 utility model patent that the patent No. " 200820223500.1 " name is called audio player protector; its publication date is on October 07th, 2009, comprises the audio signal identification module and loud speaker turn-off module and audio signal changing voltage module that are connected with sound speaker input.But also there is following deficiency when preventing sound equipment from divulging a secret in this patented technology: one, adopt when sound equipment is without music; the mode adding audio-frequency noise signal prevents from divulging a secret; if it is improper that this audio-frequency noise regulates; signal is too large; noise pollution can be caused; signal is too little, does not reach again good protected effect.Two, former patented product is active equipment, and power supply must be provided to work.Three, former patented product volume is large, and cost is high, is unfavorable for that single channel is protected.
Summary of the invention
The object of the invention is to overcome the problems referred to above that sound equipment of the prior art in use exists, a kind of Anti-secret leakage device for passive sound box is provided.After adopting the present invention; when sound equipment does not play music or voice due to a variety of causes; sound equipment and circuit are in off-state; sound equipment is made to lose " pickup " effect; once circuit has audio signal, automatically connect sound equipment immediately, do not affect the normal use of sound equipment; thus serve protective effect, prevent and divulge a secret.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of Anti-secret leakage device for passive sound box, it is characterized in that: comprise power transfer module, audio signal identification module, control module and circuit on-off device, described power transfer module and audible transmission connection extract audio signal, and audio signal is converted to direct voltage and is respectively audio signal identification module, circuit on-off control module and circuit on-off device are powered, audio signal identification module obtains audio signal from audible transmission circuit and audio signal is sent to control module, control module switches on and off according to the uncontrolled line break-make device that has of audio signal, circuit on-off device is connected with the loud speaker of sound equipment.
Described audio signal identification module is connected with control module, and control module is connected with circuit on-off device, and circuit on-off device is connected to loudspeaker input terminal, and audio signal identification module, control module and circuit on-off device are connected respectively to audible transmission circuit.
Described power transfer module comprise audio signal rectification be direct voltage diode rectifier, direct voltage carried out to the filter capacitor of filtering process and direct voltage carried out to the voltage stabilizing didoe of voltage stabilizing process.
Described audio signal identification module comprises input protection circuit, signal sample circuit and operational amplification circuit; described input protection circuit obtains audio signal from audible transmission circuit; signal sample circuit is transferred to after dividing potential drop, amplitude limit; the audio signal filtering process that signal sample circuit will receive, operational amplification circuit accept filter process after audio signal and be transferred to control module after producing audio pulse.
Described input protection circuit is connected with signal sample circuit, and signal sample circuit is connected with operational amplification circuit, and operational amplification circuit is connected with control module.
Described control module comprises RC timing network and drive circuit, and RC timing network audio reception pulse signal also produces voltage signal to the capacitor charging in RC timing network, and after drive circuit receiver voltage signal, output driving current is to circuit on-off device.
When the voltage signal that electric capacity in described RC timing network produces reaches the control gate voltage limit of drive circuit, drive circuit output driving current is to circuit on-off device.
The input of described RC timing network is connected with the operational amplification circuit of audio signal identification module, and output is connected with drive circuit, and the output of drive circuit is connected with circuit on-off device.
When the drive circuit output driving current of described control module is to circuit on-off device, the input of circuit on-off device and output are connected, and audio signal is delivered to loud speaker; When drive circuit exports without drive current, the input of circuit on-off device and output disconnect, and loud speaker and audio transmission line disconnect.
One, the present invention includes power transfer module, audio signal identification module, control module and circuit on-off device.Described power transfer module and audible transmission connection extract audio signal, and audio signal is converted to direct voltage and is respectively audio signal identification module, circuit on-off control module and circuit on-off device are powered, audio signal identification module obtains audio signal from audible transmission circuit and audio signal is sent to control module, control module switches on and off according to the uncontrolled line break-make device that has of audio signal, circuit on-off device is connected with the loud speaker of sound equipment, the present invention extracts power supply from audio signal, power for other parts, thus reach this device without the need to power supply, when circuit there is no audio signal, loud speaker open circuit, when having audio signal, the present invention works, loud speaker and circuit are connected, loud speaker just can normally work, thus serve protective effect, prevent and divulge a secret.
Two, in the present invention, described audio signal identification module is connected with control module, control module is connected with circuit on-off device, circuit on-off device is connected to loudspeaker input terminal, and audio signal identification module, control module and circuit on-off device are connected respectively to audible transmission circuit, this structure is convenient to control module control circuit break-make device and is switched on and off, and accuracy is high.
Three, in the present invention, described power transfer module comprise audio signal rectification be direct voltage diode rectifier, direct voltage carried out to the filter capacitor of filtering process and direct voltage carried out to the voltage stabilizing didoe of voltage stabilizing process, power transfer module directly obtains audio signal from audible transmission circuit and to go forward side by side row relax, ensure that the present invention can normally work.
Four, in the present invention, described audio signal identification module comprises input protection circuit, signal sample circuit and operational amplification circuit, described input protection circuit obtains audio signal from audible transmission circuit, through dividing potential drop, signal sample circuit is transferred to after amplitude limit, can prevent high pressure audio signal or other high-voltage pulse signals from damaging late-class circuit, the audio signal filtering process that signal sample circuit will receive, prevent the interference of power frequency and high-frequency signal, realize audio signal recognition function, operational amplification circuit accept filter process after audio signal and be transferred to control module after producing audio pulse, by regulating gain with control system sensitivity, ensure that comparatively faint signal still can trigger rear class control module.
Five, in the present invention, described input protection circuit is connected with signal sample circuit, and signal sample circuit is connected with operational amplification circuit, and operational amplification circuit is connected with control module, and circuit structure is simple, is easy to control.
Six, in the present invention, described control module comprises RC timing network and drive circuit, RC timing network audio reception pulse signal also produces voltage signal to the capacitor charging in RC timing network, after drive circuit receiver voltage signal, output driving current is to circuit on-off device, the time declined due to control voltage can be controlled by the time constant of RC timing network, improves practicality of the present invention.
Seven, in the present invention, when the voltage signal that the electric capacity in described RC timing network produces reaches the control gate voltage limit of drive circuit, drive circuit output driving current is to circuit on-off device, and this mode improves control precision of the present invention.
Eight, in the present invention, the input of described RC timing network is connected with the operational amplification circuit of audio signal identification module, and output is connected with drive circuit, and the output of drive circuit is connected with circuit on-off device, this mode circuit structure is simple, reduces equipment cost.
Nine, in the present invention, when the drive circuit output driving current of described control module is to circuit on-off device, the input of circuit on-off device and output are connected, and audio signal is delivered to loud speaker; When drive circuit exports without drive current, the input of circuit on-off device and output disconnect, and loud speaker and audio transmission line disconnect, and control precision is high, and control mode is flexible.
Accompanying drawing explanation
Fig. 1 is principle of the invention structured flowchart
Fig. 2 is audio signal identification module structured flowchart of the present invention
Fig. 3 is control module structured flowchart of the present invention
Fig. 4 is circuit on-off device of the present invention and loud speaker connection diagram
Fig. 5 is electrical block diagram of the present invention.
Embodiment
A kind of Anti-secret leakage device for passive sound box, comprise power transfer module, audio signal identification module, control module and circuit on-off device, described power transfer module and audible transmission connection extract audio signal, and audio signal is converted to direct voltage and is respectively audio signal identification module, circuit on-off control module and circuit on-off device are powered, audio signal identification module obtains audio signal from audible transmission circuit and audio signal is sent to control module, control module switches on and off according to the uncontrolled line break-make device that has of audio signal, circuit on-off device is connected with the loud speaker of sound equipment.
In the present invention, described audio signal identification module is connected with control module, control module is connected with circuit on-off device, and circuit on-off device is connected to loudspeaker input terminal, and audio signal identification module, control module and circuit on-off device are connected respectively to audible transmission circuit.
In the present invention, described power transfer module comprise audio signal rectification be direct voltage diode rectifier, direct voltage carried out to the filter capacitor of filtering process and direct voltage carried out to the voltage stabilizing didoe of voltage stabilizing process.
In the present invention; described audio signal identification module comprises input protection circuit, signal sample circuit and operational amplification circuit; described input protection circuit obtains audio signal from audible transmission circuit; signal sample circuit is transferred to after dividing potential drop, amplitude limit; the audio signal filtering process that signal sample circuit will receive, operational amplification circuit accept filter process after audio signal and be transferred to control module after producing audio pulse.
In the present invention, described input protection circuit is connected with signal sample circuit, and signal sample circuit is connected with operational amplification circuit, and operational amplification circuit is connected with control module.
In the present invention, described control module comprises RC timing network and drive circuit, and RC timing network audio reception pulse signal also produces voltage signal to the capacitor charging in RC timing network, and after drive circuit receiver voltage signal, output driving current is to circuit on-off device.
In the present invention, when the voltage signal that the electric capacity in described RC timing network produces reaches the control gate voltage limit of drive circuit, drive circuit output driving current is to circuit on-off device.
In the present invention, the input of described RC timing network is connected with the operational amplification circuit of audio signal identification module, and output is connected with drive circuit, and the output of drive circuit is connected with circuit on-off device.
In the present invention, when the drive circuit output driving current of described control module is to circuit on-off device, the input of circuit on-off device and output are connected, and audio signal is delivered to loud speaker; When drive circuit exports without drive current, the input of circuit on-off device and output disconnect, and loud speaker and audio transmission line disconnect.
Below the present invention is elaborated:
In the present invention, described power transfer module comprises: diode rectifier, filter capacitor, voltage stabilizing didoe form.Audio signal rectification, filtering, voltage stabilizing are exported 1.8V ~ 3.2V DC power supply, for other modules provide power supply.
In the present invention, described audio signal identification module comprises: input protection circuit, signal sample circuit, operational amplification circuit form.Input protection circuit directly obtains audio signal from audible transmission circuit, after dividing potential drop, amplitude limit, transfer to late-class circuit, prevents high pressure audio signal or other high-voltage pulse signals from damaging late-class circuit.Signal sample circuit, by filtering, obtains the audio signal of 300Hz-10KHz frequency range, prevents the interference of power frequency and high-frequency signal, realize audio signal recognition function.Signal after identifying is sent into rear class operational amplification circuit and is amplified, and produces audio pulse, and operational amplification circuit, by regulating gain with control system sensitivity, ensures that comparatively faint signal still can trigger rear class control module.
In the present invention, described control module comprises: RC timing network, drive circuit form.Prime modular circuit produces audio pulse and charges to the electric capacity in RC timing network, produce a voltage signal, control voltage rises rapidly, and when this voltage signal reaches drive circuit control gate voltage limit, drive circuit and output driving current are to circuit on-off device.When circuit there being lasting audio signal, drive circuit continuous firing.If audio signal stops, RC timing network is by conductive discharge, and when control voltage drops to below thresholding, drive circuit quits work.The time that control voltage declines can be controlled by the time constant of RC timing network.
In the present invention, described circuit on-off device forms primarily of low-power consumption break-make device.When control module output drive signal, input/output terminal connected by circuit on-off device, and audio signal is delivered to loud speaker.When not having drive singal, circuit on-off device disconnects, and namely loud speaker disconnects with audio transmission line.
Operation principle of the present invention is as follows:
The present invention is connected to loudspeaker input terminal, and extracting audio signal is that the present invention powers, and all devices of the present invention all adopt 1.8V operating voltage; when circuit no audio signal; circuit on-off device is failure to actuate, and loud speaker and circuit disconnect, and loses " pick-up " effect; when there being audio signal in circuit; the adhesive of circuit on-off device, loud speaker and connection, can normally work; thus serve protective effect, prevent and divulge a secret.
When circuit occurring audio signal, power transfer module obtains part energy, exports DC power supply for work of the present invention.Audio identification module filtering interference signals also protects late-class circuit, extracts audio signal, by operational amplification circuit gain with the sensitivity of adjusting device.Signal is after amplifying, the RC timing network of control module is charged, obtain the cut-in voltage of circuit on-off device drive circuit, cut-in voltage rises rapidly, after the threshold voltage of drive circuit, drive circuit and control circuit break-make device connect loud speaker and sound line, and loud speaker can normally work.After audio signal is removed, RC timing network is by electric discharge, and cut-in voltage slowly declines, and after threshold voltage, namely circuit on-off device disconnects the connection of loud speaker and sound line.
Obviously; those of ordinary skill in the art is according to grasped technological know-how and customary means; according to above said content, can also make the various ways not departing from basic fundamental thought of the present invention, these pro forma conversion are all within protection scope of the present invention.
Claims (8)
1. an Anti-secret leakage device for passive sound box, it is characterized in that: comprise power transfer module, audio signal identification module, control module and circuit on-off device, described power transfer module and audible transmission connection extract audio signal, and audio signal is converted to direct voltage and is respectively audio signal identification module, circuit on-off control module and circuit on-off device are powered, audio signal identification module obtains audio signal from audible transmission circuit and audio signal is sent to control module, control module switches on and off according to the uncontrolled line break-make device that has of audio signal, circuit on-off device is connected with the loud speaker of sound equipment, when the drive circuit output driving current of described control module is to circuit on-off device, the input of circuit on-off device and output are connected, and audio signal is delivered to loud speaker, when drive circuit exports without drive current, the input of circuit on-off device and output disconnect, and loud speaker and audio transmission line disconnect.
2. Anti-secret leakage device for passive sound box according to claim 1, it is characterized in that: described audio signal identification module is connected with control module, control module is connected with circuit on-off device, circuit on-off device is connected to loudspeaker input terminal, and audio signal identification module, control module and circuit on-off device are connected respectively to audible transmission circuit.
3. Anti-secret leakage device for passive sound box according to claim 1 and 2, is characterized in that: described power transfer module comprise audio signal rectification be direct voltage diode rectifier, direct voltage carried out to the filter capacitor of filtering process and direct voltage carried out to the voltage stabilizing didoe of voltage stabilizing process.
4. Anti-secret leakage device for passive sound box according to claim 1 and 2; it is characterized in that: described audio signal identification module comprises input protection circuit, signal sample circuit and operational amplification circuit; described input protection circuit obtains audio signal from audible transmission circuit; signal sample circuit is transferred to after dividing potential drop, amplitude limit; the audio signal filtering process that signal sample circuit will receive, operational amplification circuit accept filter process after audio signal and be transferred to control module after producing audio pulse.
5. Anti-secret leakage device for passive sound box according to claim 4, is characterized in that: described input protection circuit is connected with signal sample circuit, and signal sample circuit is connected with operational amplification circuit, and operational amplification circuit is connected with control module.
6. Anti-secret leakage device for passive sound box according to claim 5, it is characterized in that: described control module comprises RC timing network and drive circuit, RC timing network audio reception pulse signal also produces voltage signal to the capacitor charging in RC timing network, and after drive circuit receiver voltage signal, output driving current is to circuit on-off device.
7. Anti-secret leakage device for passive sound box according to claim 6, is characterized in that: when the voltage signal that the electric capacity in described RC timing network produces reaches the control gate voltage limit of drive circuit, drive circuit output driving current is to circuit on-off device.
8. Anti-secret leakage device for passive sound box according to claim 7, it is characterized in that: the input of described RC timing network is connected with the operational amplification circuit of audio signal identification module, output is connected with drive circuit, and the output of drive circuit is connected with circuit on-off device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210158087.6A CN102685640B (en) | 2012-05-21 | 2012-05-21 | Anti-secret leakage device for passive sound box |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210158087.6A CN102685640B (en) | 2012-05-21 | 2012-05-21 | Anti-secret leakage device for passive sound box |
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| CN102685640A CN102685640A (en) | 2012-09-19 |
| CN102685640B true CN102685640B (en) | 2015-08-19 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1536912A (en) * | 2003-04-06 | 2004-10-13 | 梁闽海 | Method for preventing mobile communication equipment from being remote controlled and become into wiretapper and its device |
| CN201323647Y (en) * | 2008-12-18 | 2009-10-07 | 成都立鑫新技术科技有限公司 | Audio player protector |
| CN202602875U (en) * | 2012-05-21 | 2012-12-12 | 成都立鑫新技术科技有限公司 | Passive audio anti-disclosure apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI20035109A (en) * | 2003-06-27 | 2004-12-28 | Nokia Corp | Method and apparatus for obstruction a function |
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- 2012-05-21 CN CN201210158087.6A patent/CN102685640B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1536912A (en) * | 2003-04-06 | 2004-10-13 | 梁闽海 | Method for preventing mobile communication equipment from being remote controlled and become into wiretapper and its device |
| CN201323647Y (en) * | 2008-12-18 | 2009-10-07 | 成都立鑫新技术科技有限公司 | Audio player protector |
| CN202602875U (en) * | 2012-05-21 | 2012-12-12 | 成都立鑫新技术科技有限公司 | Passive audio anti-disclosure apparatus |
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| CN102685640A (en) | 2012-09-19 |
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Denomination of invention: Anti-secret leakage device for passive sound box Effective date of registration: 20180817 Granted publication date: 20150819 Pledgee: Agricultural Bank of China Limited by Share Ltd. Chengdu Shuangliu Branch Pledgor: Chengdu Lixin New Technology Co.,Ltd. Registration number: 2018510000082 |
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Date of cancellation: 20220928 Granted publication date: 20150819 Pledgee: Agricultural Bank of China Limited by Share Ltd. Chengdu Shuangliu Branch Pledgor: CHENGDU LIXIN NEW TECHNOLOGY Co.,Ltd. Registration number: 2018510000082 |
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Denomination of invention: Passive audio leak proof device Effective date of registration: 20221008 Granted publication date: 20150819 Pledgee: Agricultural Bank of China Limited by Share Ltd. Chengdu Shuangliu Branch Pledgor: CHENGDU LIXIN NEW TECHNOLOGY Co.,Ltd. Registration number: Y2022510000268 |
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Address after: 610200 China (Sichuan) pilot Free Trade Zone, Chengdu, Sichuan, No. 186, Wulian 2nd Road, Shuangliu District, Chengdu Patentee after: CHENGDU LIXIN NEW TECHNOLOGY Co.,Ltd. Address before: 610045 No. 33 Wu Qing South Road, Chengdu, Sichuan, Wuhou District Patentee before: CHENGDU LIXIN NEW TECHNOLOGY Co.,Ltd. |
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