CN202602875U - Passive audio anti-disclosure apparatus - Google Patents
Passive audio anti-disclosure apparatus Download PDFInfo
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- CN202602875U CN202602875U CN 201220228728 CN201220228728U CN202602875U CN 202602875 U CN202602875 U CN 202602875U CN 201220228728 CN201220228728 CN 201220228728 CN 201220228728 U CN201220228728 U CN 201220228728U CN 202602875 U CN202602875 U CN 202602875U
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Abstract
The utility model discloses a passive audio anti-disclosure apparatus which comprises a power supply conversion module, an audio signal identification module, a control module and a line on-off device. The power supply conversion module is connected with an audio transmission line for extracting audio signals, and converts the audio signals into direct voltage and supplies electricity to the audio signal identification module, a line on-off control module and the line on-off device respectively. The audio signal identification module acquires audio signals form the audio transmission line and transmits the audio signals to the control module. The control module controls the on-off states of the line on-off device according to that whether an audio signal exists. The line on-off device is connected with a loudspeaker of the audio. According to the passive audio anti-disclosure apparatus, when the audio does not play music or voice due to various reasons, the audio and the line are in an off state, and the audio loses the effect of voice "pickup". Once any audio signal exists on the line, the audio is immediately switched on, and thus the normal use of the audio is not affected, a role in protection is played and disclosure is prevented.
Description
Technical field
The utility model relates to a kind of sound equipment protective device, relates in particular to a kind of passive sound equipment leakage prevention device that prevents that information from being divulged a secret through sound equipment.
Background technology
The material and cultural life of Along with people's improves day by day.Radical change has also taken place in people's work, life style, in the time of usually with amusement and recreation, carries out a few thing and exchanges and commercial activity.As places such as hotel, hotel, restaurant, teahouse be that people select to get together, the place to go of business negotiation, leisure, amusement.Nature, bound beautiful music is accompanied by these movable carrying out.The loud speaker of sound equipment is not when having audio signal output; It is exactly a pick-up; Can convert all sound signals in the place to the signal of telecommunication and propagate, and produce electromagnetic radiation, away from 10 meters in the place at transmission line; Receiver only need be done simple processing and amplifying, just the clear conversation content of hearing of ability; Loud speaker has become fearful tapping device! Generally speaking, to the not special control of the sound equipment of playing back music, at this moment; Carry out activities such as various business negotiations, secret negotiations, conclave as people; The content that people talked is just propagated by other people eavesdropping through sound equipment easily, causes tremendous loss and the result who is difficult to expect.So, sound equipment is caused the protection of divulging a secret, we can not be ignored.Because acoustic product just is being widely applied in our work, life, and corresponding security product is almost nil at present.Therefore, prevent to divulge a secret in these place mistakes, very urgent.
In order to address the above problem; The patentee has proposed the utility model patent that the patent No. " 200820223500.1 " name is called the sound equipment protector on December 18th, 2008; Its open day is on October 07th, 2009, comprises the audio signal identification module and loud speaker turn-off module and the audio signal changing voltage module that are connected with sound equipment loud speaker input.But also there is following deficiency in this patented technology when preventing that sound equipment from divulging a secret: when one, being employed in sound equipment and not having music; The mode that adds the audio-frequency noise signal prevents to divulge a secret; If it is improper that this audio-frequency noise is regulated, signal is too big, can cause noise pollution; Signal is too little, does not reach good protection effect again.Two, former patented product is an active equipment, must provide power supply to work.Three, former patented product volume is big, and cost is high, is unfavorable for the single channel protection.
The utility model content
The purpose of the utility model is to overcome the problems referred to above that sound equipment of the prior art in use exists, and a kind of passive sound equipment leakage prevention device is provided.After adopting the utility model, because a variety of causes not when playing back music or voice, sound equipment and circuit are in off-state when sound equipment; Make sound equipment lose " pickup " effect; In case audio signal is arranged on the circuit, connect sound equipment immediately automatically, do not influence the normal use of sound equipment; Thereby played protective effect, prevented to divulge a secret.
For realizing above-mentioned purpose, the technical scheme that the utility model adopts is following:
A kind of passive sound equipment leakage prevention device; It is characterized in that: comprise power transfer module, audio signal identification module, control module and circuit on-off device; Said power transfer module is connected with the audible transmission circuit extracts audio signal; And convert audio signal into direct voltage and be respectively audio signal identification module, circuit on-off control module and the power supply of circuit on-off device; The audio signal identification module obtains audio signal and audio signal is sent to control module from the audible transmission circuit, and control module switches on and off according to the uncontrolled line break-make device that has of audio signal, and the circuit on-off device is connected with the loud speaker of sound equipment.
Said audio signal identification module is connected with control module, and control module is connected with the circuit on-off device, and the circuit on-off device is connected to the loud speaker input, and audio signal identification module, control module and circuit on-off device are connected respectively to the audible transmission circuit.
Said power transfer module comprise with the audio signal rectification be direct voltage diode rectifier, direct voltage is carried out the filter capacitor of Filtering Processing and direct voltage is carried out the voltage stabilizing didoe that voltage stabilizing is handled.
Said audio signal identification module comprises input protection circuit, signal sample circuit and operational amplification circuit; Said input protection circuit obtains audio signal from the audible transmission circuit; Behind dividing potential drop, amplitude limit, be transferred to signal sample circuit; Signal sample circuit is the audio signal Filtering Processing that receives, operational amplification circuit accept filter after handling audio signal and produce audio pulse after be transferred to control module.
Said 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.
Said control module comprises RC timing network and drive circuit, and the RC timing network receives audio pulse and charging produces voltage signal to the electric capacity in the RC timing network, and output driving current was to the circuit on-off device after drive circuit received voltage signal.
When the voltage signal that the electric capacity in the said RC timing network produces reaches the control threshold voltage of drive circuit, drive circuit output driving current to circuit on-off device.
The input of said 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 the circuit on-off device.
During drive circuit output driving current to the circuit on-off device of said control module, the input of circuit on-off device and output are connected, and audio signal is delivered to loud speaker; When drive circuit did not have drive current output, the input of circuit on-off device and output broke off, and loud speaker and audio transmission line break off.
One, the utility model comprises power transfer module, audio signal identification module, control module and circuit on-off device.Said power transfer module is connected with the audible transmission circuit extracts audio signal, and converts audio signal into direct voltage and be respectively audio signal identification module, circuit on-off control module and the power supply of circuit on-off device, and the audio signal identification module obtains audio signal and audio signal is sent to control module from the audible transmission circuit; Control module switches on and off according to the uncontrolled line break-make device that has of audio signal, and the circuit on-off device is connected with the loud speaker of sound equipment, and the utility model extracts power supply from audio signal; Supply other part power supply, need not power supply thereby reach this device, when not having audio signal on the circuit; Loud speaker opens circuit, when audio signal is arranged, and the utility model work; Loud speaker and circuit are connected; Loud speaker is the ability operate as normal just, thereby has played protective effect, has prevented to divulge a secret.
Two, in the utility model; Said audio signal identification module is connected with control module; Control module is connected with the circuit on-off device, and the circuit on-off device is connected to the loud speaker input, and audio signal identification module, control module and circuit on-off device are connected respectively to the 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 utility model; Said power transfer module comprise with the audio signal rectification be direct voltage diode rectifier, direct voltage is carried out the filter capacitor of Filtering Processing and direct voltage is carried out the voltage stabilizing didoe that voltage stabilizing is handled; Power transfer module is directly obtained audio signal and is handled from the audible transmission circuit, has guaranteed that the utility model can operate as normal.
Four, in the utility model; Said audio signal identification module comprises input protection circuit, signal sample circuit and operational amplification circuit; Said input protection circuit obtains audio signal from the audible transmission circuit, behind dividing potential drop, amplitude limit, is transferred to signal sample circuit, can prevent that high pressure audio signal or other high-voltage pulse signals from damaging late-class circuit; Signal sample circuit is with the audio signal Filtering Processing that receives; Prevent the interference of power frequency and high-frequency signal, realize the audio signal recognition function, operational amplification circuit accept filter after handling audio signal and produce audio pulse after be transferred to control module; Through regulating gain, guarantee that comparatively faint signal still can trigger back level control module with control system sensitivity.
Five, in the utility model, said 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 utility model; Said control module comprises RC timing network and drive circuit; The RC timing network receives audio pulse and charging produces voltage signal to the electric capacity in the RC timing network; Output driving current because the time that control voltage descends can be controlled by the time constant of RC timing network, had improved the practicality of the utility model to the circuit on-off device after drive circuit received voltage signal.
Seven, in the utility model, when the voltage signal that the electric capacity in the said RC timing network produces reaches the control threshold voltage of drive circuit, drive circuit output driving current to circuit on-off device, this mode has improved the control precision of the utility model.
Eight, in the utility model; The input of said 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 the circuit on-off device; This mode circuit structure is simple, has reduced equipment cost.
Nine, in the utility model, during drive circuit output driving current to the circuit on-off device of said control module, the input of circuit on-off device and output are connected, and audio signal is delivered to loud speaker; When drive circuit did not have drive current output, the input of circuit on-off device and output broke off, and loud speaker and audio transmission line break off, and control precision is high, and control mode is flexible.
Description of drawings
Fig. 1 is the utility model theory structure block diagram
Fig. 2 is the utility model audio signal identification module structured flowchart
Fig. 3 is the utility model control module structured flowchart
Fig. 4 is that the utility model circuit on-off device is connected sketch map with loud speaker
Fig. 5 is the utility model electrical block diagram.
Embodiment
A kind of passive sound equipment leakage prevention device; Comprise power transfer module, audio signal identification module, control module and circuit on-off device; Said power transfer module is connected with the audible transmission circuit extracts audio signal; And convert audio signal into direct voltage and be respectively audio signal identification module, circuit on-off control module and the power supply of circuit on-off device; The audio signal identification module obtains audio signal and audio signal is sent to control module from the audible transmission circuit, and control module switches on and off according to the uncontrolled line break-make device that has of audio signal, and the circuit on-off device is connected with the loud speaker of sound equipment.
In the utility model; Said audio signal identification module is connected with control module; Control module is connected with the circuit on-off device, and the circuit on-off device is connected to the loud speaker input, and audio signal identification module, control module and circuit on-off device are connected respectively to the audible transmission circuit.
In the utility model, said power transfer module comprise with the audio signal rectification be direct voltage diode rectifier, direct voltage is carried out the filter capacitor of Filtering Processing and direct voltage is carried out the voltage stabilizing didoe that voltage stabilizing is handled.
In the utility model; Said audio signal identification module comprises input protection circuit, signal sample circuit and operational amplification circuit; Said input protection circuit obtains audio signal from the audible transmission circuit; Behind dividing potential drop, amplitude limit, be transferred to signal sample circuit, signal sample circuit is the audio signal Filtering Processing that receives, operational amplification circuit accept filter after handling audio signal and produce audio pulse after be transferred to control module.
In the utility model, said 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 utility model; Said control module comprises RC timing network and drive circuit; The RC timing network receives audio pulse and charging produces voltage signal to the electric capacity in the RC timing network, and output driving current was to the circuit on-off device after drive circuit received voltage signal.
In the utility model, when the voltage signal that the electric capacity in the said RC timing network produces reaches the control threshold voltage of drive circuit, drive circuit output driving current to circuit on-off device.
In the utility model, the input of said 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 the circuit on-off device.
In the utility model, during drive circuit output driving current to the circuit on-off device of said control module, the input of circuit on-off device and output are connected, and audio signal is delivered to loud speaker; When drive circuit did not have drive current output, the input of circuit on-off device and output broke off, and loud speaker and audio transmission line break off.
Below the utility model is elaborated:
In the utility model, said power transfer module comprises: diode rectifier, filter capacitor, voltage stabilizing didoe are formed.With audio signal rectification, filtering, voltage stabilizing output 1.8V～3.2V DC power supply, for other modules provide power supply.
In the utility model, said audio signal identification module comprises: input protection circuit, signal sample circuit, operational amplification circuit are formed.Input protection circuit is directly obtained audio signal from the audible transmission circuit, behind dividing potential drop, amplitude limit, transfers to late-class circuit, prevents that high pressure audio signal or other high-voltage pulse signals from damaging late-class circuit.Signal sample circuit is obtained the audio signal of 300Hz-10KHz frequency range through filtering, prevents the interference of power frequency and high-frequency signal, realizes the audio signal recognition function.Signal after identification is sent into back level operational amplification circuit and is amplified, and produces audio pulse, and operational amplification circuit can guarantee that comparatively faint signal still can trigger back level control module through regulating gain with control system sensitivity.
In the utility model, said control module comprises: RC timing network, drive circuit are formed.The prime modular circuit produces audio pulse the electric capacity in the RC timing network is charged; Produce a voltage signal; Control voltage rises rapidly, and when this voltage signal reached drive circuit control threshold voltage, drive circuit was output driving current to a circuit on-off device.When lasting audio signal is arranged on the circuit, the drive circuit continuous firing.If audio signal stops, the RC timing network is through conductive discharge, and control voltage drops to thresholding when following, and drive circuit quits work.The time that control voltage descends can be controlled by the time constant of RC timing network.
In the utility model, said circuit on-off device mainly is made up of low-power consumption break-make device.When the control module output drive signal, the circuit on-off device is connected input/output terminal, and audio signal is delivered to loud speaker.When not having drive signal, the circuit on-off device breaks off, and loud speaker promptly breaks off with audio transmission line.
The operation principle of the utility model is following:
The utility model is connected the loud speaker input, and extracting audio signal is the utility model power supply, and all devices of the utility model all adopt the 1.8V operating voltage, when circuit absence of audio signal; The circuit on-off device is failure to actuate, and loud speaker and circuit break off, and loses " pick-up " effect; When in the circuit audio signal being arranged, the adhesive of circuit on-off device, loud speaker is connected with circuit; The ability operate as normal, thus played protective effect, prevented to divulge a secret.
When audio signal occurring on the circuit, power transfer module is obtained part energy, and the output DC source supplies the utility model work.Audio identification module filtering interference signals is also protected late-class circuit, extracts audio signal, through the sensitivity of operational amplification circuit gain with adjusting device.Signal is after amplifying; RC timing network to control module charges; Obtain the cut-in voltage of circuit on-off device drive circuit, cut-in voltage rises rapidly, be higher than the threshold voltage of drive circuit after; Drive circuit is that control circuit break-make device connects loud speaker and sound line, but the loud speaker operate as normal.After audio signal was removed, the RC timing network was through discharge, and cut-in voltage slowly descends, be lower than threshold voltage after, the circuit on-off device promptly breaks off being connected of loud speaker and sound line.
Obviously; Those of ordinary skill in the art is according to technological know-how of being grasped and customary means; According to the above content, can also make the various ways that does not break away from the utility model basic fundamental thought, these pro forma conversion are all within the protection range of the utility model.
Claims (8)
1. passive sound equipment leakage prevention device; It is characterized in that: comprise power transfer module, audio signal identification module, control module and circuit on-off device; Said power transfer module is connected with the audible transmission circuit extracts audio signal; And convert audio signal into direct voltage and be respectively audio signal identification module, circuit on-off control module and the power supply of circuit on-off device; The audio signal identification module obtains audio signal and audio signal is sent to control module from the audible transmission circuit, and control module switches on and off according to the uncontrolled line break-make device that has of audio signal, and the circuit on-off device is connected with the loud speaker of sound equipment.
2. passive sound equipment leakage prevention device according to claim 1; It is characterized in that: said audio signal identification module is connected with control module; Control module is connected with the circuit on-off device; The circuit on-off device is connected to the loud speaker input, and audio signal identification module, control module and circuit on-off device are connected respectively to the audible transmission circuit.
3. passive sound equipment leakage prevention device according to claim 1 and 2 is characterized in that: said power transfer module comprise with the audio signal rectification be direct voltage diode rectifier, direct voltage is carried out the filter capacitor of Filtering Processing and direct voltage is carried out the voltage stabilizing didoe that voltage stabilizing is handled.
4. passive sound equipment leakage prevention device according to claim 1 and 2; It is characterized in that: said audio signal identification module comprises input protection circuit, signal sample circuit and operational amplification circuit; Said input protection circuit obtains audio signal from the audible transmission circuit; Behind dividing potential drop, amplitude limit, be transferred to signal sample circuit; Signal sample circuit is the audio signal Filtering Processing that receives, operational amplification circuit accept filter after handling audio signal and produce audio pulse after be transferred to control module.
5. passive sound equipment leakage prevention device according to claim 4, it is characterized in that: said 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. according to claim 1,2 or 5 described passive sound equipment leakage prevention devices; It is characterized in that: said control module comprises RC timing network and drive circuit; The RC timing network receives audio pulse and charging produces voltage signal to the electric capacity in the RC timing network, and output driving current was to the circuit on-off device after drive circuit received voltage signal.
7. passive sound equipment leakage prevention device according to claim 6 is characterized in that: when the voltage signal that the electric capacity in the said RC timing network produces reaches the control threshold voltage of drive circuit, and drive circuit output driving current to circuit on-off device.
8. passive sound equipment leakage prevention device according to claim 7; It is characterized in that: the input of said 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 the circuit on-off device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220228728 CN202602875U (en) | 2012-05-21 | 2012-05-21 | Passive audio anti-disclosure apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220228728 CN202602875U (en) | 2012-05-21 | 2012-05-21 | Passive audio anti-disclosure apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN202602875U true CN202602875U (en) | 2012-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220228728 Expired - Lifetime CN202602875U (en) | 2012-05-21 | 2012-05-21 | Passive audio anti-disclosure apparatus |
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| CN (1) | CN202602875U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102685640A (en) * | 2012-05-21 | 2012-09-19 | 成都立鑫新技术科技有限公司 | Anti-secret leakage device for passive sound box |
-
2012
- 2012-05-21 CN CN 201220228728 patent/CN202602875U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102685640A (en) * | 2012-05-21 | 2012-09-19 | 成都立鑫新技术科技有限公司 | Anti-secret leakage device for passive sound box |
| CN102685640B (en) * | 2012-05-21 | 2015-08-19 | 成都立鑫新技术科技有限公司 | Anti-secret leakage device for passive sound box |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121212 |