RU2408143C1 - Noise source for vibro-acoustic masking facilities - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: noise source has an electroacoustic transducer and an electric noise signal generator. The source also has an electro-vibration transducer. The housing of the noise source and the electroacoustic transducer form a resonant chamber and the electro-vibration transducer is rigidly mounted on the inner wall of the base of the housing of the noise source. The noise generator is double-channel programmable, with possibility of simultaneous operation of both channels or one of them. The output of the first channel of the generator is connected to the electroacoustic transducer, and the output of the second channel is connected to the electro-vibration transducer. The eletroacoustic transducer and electro-vibration transducer are piezoceramic transducers.

EFFECT: broader functionalities, high efficiency of generating acoustic noise and reduced overall dimensions.

3 cl, 4 dwg

Description

The invention relates to means for creating artificial interference and can be used in the implementation of vibro-acoustic noise of rooms.

A known emitter of vibro-acoustic interference, which contains a sound frequency noise generator, a vibro-acoustic signal generator configured to be mounted on the frame of the room, and electric communication lines connecting the noise generator to each of the vibro-acoustic signal generators, made in the form of an electromagnetic vibrator having a permanent magnet, induction a coil, a moving core, and a mechanical impact unit on the room's framing (see RF certificate for utility model No. 21490) [1]. The disadvantages of the described device are:

- the inability to adjust the parameters emitted by each emitter of noise, because each emitter is connected directly to the output of a common noise generator;

- low sound pressure of emitted noise due to power losses in the wires of communication lines;

- the complexity of mounting the device, because the number of wired communication lines is equal to the number of shakers of vibroacoustic signals and all of them (communication lines) must be connected to one common noise generator;

- there is the possibility of unauthorized removal of audio information in the pauses between sessions of vibro-acoustic noise, because used shapers of vibroacoustic signals can work both emitters and receivers of acoustic signals.

Due to these shortcomings, the device cannot provide effective protection for voice information.

A device for vibro-acoustic noise flooring according to the certificate for utility model No. 27442 [2], comprising a power source, a unit for vibro-acoustic noise generation, including at least one noise generator and at least one vibration transducer, with each output of the power source the corresponding power supply line is connected to the power input of the corresponding noise generator, the output of which is connected to the input of the corresponding vibration transducer.

The disadvantages of the known device are:

- the lack of the ability to individually adjust the parameters of the emitted noise for each vibration transducer, as a result of this, the protection of voice information is not effective enough;

- low sound pressure of the emitted noise of the vibration transducers, which, in the presence of gaps, holes and other things in the building envelope, can lead to leakage of acoustic information.

The closest in technical essence to the proposed invention is a generator-emitter, which is part of the equipment for protecting information from acoustic reconnaissance "Sonata AV" [3]. The Sonata-AV vibro-acoustic and acoustic protection system is designed to actively protect speech information in allocated (protected) rooms from leakage through acoustic and vibro-acoustic channels.

Generators-emitters (noise sources) are a combination of either an electro-acoustic transducer and an electric noise signal generator, or a vibration transducer and an electric noise signal generator, and are designed to excite acoustic noise in rooms. The parameters of the emitted noise (programming) are set using the programmer, which is turned on for the duration of the equipment setup. The settings made during programming are stored in non-volatile memory of the emitter-emitters.

The disadvantages are:

- lack of versatility due to the presence of two types of noise sources - acoustic and vibration;

- large dimensions of the emitter-generators due to the use of electrodynamic heads as converters in them.

The technical result to which the invention is directed is the creation of a universal noise source that can operate both a vibrational or acoustic noise source and a vibroacoustic noise source, due to which the universal noise source can protect speech information from leakage through acoustic or vibro-acoustic channels, or along both channels at the same time, as well as a reduction in size due to the introduction of a resonant chamber into the device and due to its use as converters - pied zokeramic emitters.

The specified technical result is achieved due to the fact that the noise source containing the electro-acoustic transducer and the noise generator according to the invention further comprises an electro-vibration transducer, wherein the noise source body and the electro-acoustic transducer form a resonance chamber, and the electro-vibration transducer is rigidly fixed to the inner wall of the base of the noise source body for effective transmission of vibration through the base of the housing to the object on which the noise source is fixed.

In this case, the noise generator is an electric programmable noise generator (EPGS) and is made two-channel with the possibility of simultaneous operation of its two channels, and one of them, while the output of the first EPGS channel is connected to the electro-acoustic transducer, and the output of the second EPGS channel is connected to the electro-vibrational transducer .

In this case, the electro-acoustic transducer and the electro-vibration transducer are piezoceramic transducers.

The essence of the invention is illustrated by the following graphic materials.

Figure 1 is a schematic illustration of the construction of a noise source.

Figure 2 is a block diagram of a noise source.

Figure 3 - block diagram of the vibro-acoustic noise of the room in programming mode.

Figure 4 - block diagram of the vibro-acoustic noise of the room in the operating mode.

The inventive noise source 3 (Fig. 1) is made in the form of a housing 18 with an electric noise signal generator EPGS 5 located therein, an electro-acoustic transducer 14 and an electro-vibration transducer 15. The electro-acoustic transducer 14 forms a resonance chamber 19 with the housing 18. The electro-vibration transducer 15 is rigidly fixed to the inner wall of the base of the housing of the noise source 3 for effective transmission of vibration through the base of the housing 18 to the object 21 on which the noise source is fixed.

The noise generator 5 is an electric programmable noise generator (EPGS) and is made two-channel with the possibility of simultaneous operation of two of its channels, and one of them, while the output of the first channel EPGS 5 is connected to the electro-acoustic transducer 14, and the output of the second channel EPGS 5 is connected to electrovibration transducer 15 (figure 2).

The electro-acoustic transducer 14 and the electro-vibration transducer 15 are the corresponding piezoceramic transducers, which significantly reduces their dimensions compared to the prototype.

To carry out its function, the claimed noise source 3 through its input 17 is connected to the communication line 4 and through the programmer 2 is connected to the power supply unit 1 (figure 3). Several noise sources 3 can be connected to the communication line 4, depending on the required impact on the acoustic situation in the serviced room.

The noise generator (EPGS) 5 can be performed as follows. The structure of EPGS 5 includes: signal splitter 6, stabilizer 16, microcontroller 7, first digital-to-analog converter DAC 8, first level 9 controller, second DAC 10, second level 11 controller, first adjustable power amplifier 12, second adjustable power amplifier 13.

In this case, the input of signal splitter 6, which is input 17 of noise source 3, is connected to communication line 4, and the first output of signal splitter is connected to stabilizer 16, the outputs of which are connected to power inputs of EPGS units 5. The second output of signal splitter 6 is connected to the information input of the microcontroller 7, the first information output of which is connected to the digital input of the first DAC 8, the analog output of which is connected to the signal input of the first power amplifier 12, and the second information output of the microcontroller 7 is connected to the first level 9 controller, the output of which is connected to the control input of the first power amplifier 12, and the third information output of the microcontroller is connected to the digital input of the second DAC 10, whose analog output is connected to the signal input of the second adjustable power amplifier 13, and the fourth information output of the microcontroller is connected to the input of the second level controller 11, the output of which is connected to the control input of the second power amplifier 13. The output of the first power amplifier 12, which is the output of the first EPGS channel 5, is connected to the electro-acoustic transducer 14, and the output of the second power amplifier 13, which is the output of the second EPGS channel 5, is connected to the electro-vibrational transducer 15.

The specified example of the implementation of the generator 5 noise (EPS) is not exhaustive, it is given only to understand the essence of the invention.

The operation of the device. The inventive noise source 3 can operate in one of two modes: programming mode (figure 3) and operating mode (figure 4). In the programming mode (figure 3), the operator using the programmer 2 sets the parameters of the operating mode of the device (volume of each channel, spectrum type, etc.), which are stored in the non-volatile memory of the SPS 5 (for example, in the non-volatile memory of the microcontroller 7 in figure 2) . In the operating mode, the device solves its main task - the noise of the room with acoustic and / or vibrational noise having parameters set by the operator during programming. Moreover, each noise source 3 connected to the communication line 4 may have its own individual parameters of radiated noise acoustic and / or vibrational noise.

When working in programming mode, the voltage generated by the power supply unit 1 is fed to the input of programmer 2. In programmer 2, this voltage is mixed with information signals coming from the controls of programmer 2, for example, from the keyboard. Using these controls, the operator sets the required radiation parameters for each of the noise sources 3 connected to the communication line 4. The supply voltage mixed with information signals containing the necessary parameters for noise sources 3 is supplied from the output of programmer 2 to communication line 4 and then to inputs 17 of all noise sources 3 connected to communication line 4.

In the noise source 3, the voltage is supplied to the input of the EPGS 5. In the example implementation of the EPGS 5 shown in figure 2, this input is the input of its signal splitter 6. In the signal separator 6, information signals and the supply voltage are separated, and the information signals are fed to the microcontroller 7 for their further processing, and the supply voltage is supplied to the stabilizer 16 to receive power supply voltages for EPGS units 5. Microcontroller 7 extracts the settings from the received information signals blocks EPGS 5 and writes them to its non-volatile memory. These parameters are: the address of the noise source 3, the shape and spectrum of the signals generated by the first and second channels of the EPGS 5 noise, the noise level generated by the first and second channels of the EPGS 5, etc. When the power is turned off, the settings are not erased from the non-volatile memory of the microcontroller 7, and when the next time you turn on the device’s parameters are restored to the state at the time of power off.

In the operating mode (Fig. 4), the voltage from the power supply unit 1 enters the communication line 4 and then to the input 17 of all noise sources 3 connected to the communication line 4. In each noise source 3, the voltage is supplied to the input of the EPGS 5, namely to its signal splitter 6, through which the voltage is supplied to the stabilizer 16 to obtain stabilized supply voltages for the units of the EPGS 5. Noise signals of the first and second channels are generated digitally by the microcontroller software 7 in accordance with the parameters stored in its non-volatile memory. The digital noise signals thus formed from the first and third information outputs of the microcontroller 7 are fed to the inputs of the first and second DACs 8 and 10, which convert the digital signals into analog form. Next, the noise signals in analog form are fed to the signal inputs of the first and second adjustable power amplifiers 12 and 13. Information about the current levels of emitted interference of the first and second channels is generated by the microcontroller 7 software at its second and fourth information outputs, from where it comes to the first and second level 9 and 11 controllers that generate control signals supplied to the control inputs of the first and second adjustable power amplifiers 12 and 13. Power-amplified noise signal with the outputs of the first and second adjustable amplifiers 12 and 13, which are the outputs of the first and second channels EPGSH 5, arrive, respectively, at the electroacoustic transducer 14 and transducer 15 elektrovibratsionny.

The electro-acoustic transducer 14 emits acoustic vibrations into the resonant chamber 19 (Fig. 1). The resonance chamber 19 has an acoustic contact 20 with the air of the room in which the inventive device is located. When the acoustic noise signal from the electro-acoustic transducer 14 passes through the resonant chamber 19, its spectrum is finally formed, and its level rises to the level required to solve the problem.

The electrovibration transducer 15 has a hard mechanical contact with the housing 18, which, when attaching the housing to a solid object 21 (for example, to a room wall or to a window), allows the vibration of the electrovibrator 15 to be transmitted almost without loss through the base of the housing 18 to this object and, ultimately , act in a predetermined manner on the acoustic environment in the premises served.

The proposed device is compact and uncomplicated to manufacture, reliably blocks the channels of leakage of acoustic information. It will significantly increase the efficiency and effectiveness of protecting the premises from unauthorized removal of information.

INFORMATION SOURCES

1. Certificate of the Russian Federation for utility model No. 21490. Vibration-acoustic emitter. Published: January 20, 2002.

2. Certificate for utility model No. 27442. The device vibroacoustic noise of the room. Published: January 27, 2003.

3. Equipment for the protection of information from acoustic reconnaissance "Sonata AB". Developer CJSC ANNA, Moscow. Internet resource, the closest analogue: http://www.npoanna.ru/Content.aspx?name=models.sonata-av2b.

Claims (3)

1. A noise source for vibro-acoustic noise of a room, comprising an electro-acoustic transducer and a noise generator, characterized in that it further comprises an electro-vibration transducer, wherein the noise source body and the electro-acoustic transducer form a resonance chamber, and the electro-vibration transducer is rigidly fixed to the inner wall of the base of the noise source body for effective vibration transmission through the base of the housing to the object on which the noise source is fixed. 2. The noise source according to claim 1, characterized in that the noise generator (EPGS) is made two-channel programmable with the possibility of simultaneous operation of its two channels, and one of them, while the output of the first channel EPGS is connected to the electro-acoustic transducer, and the output of the second EPGSh channel - to an electrovibration transducer. 3. The noise source according to claim 1, characterized in that the electro-acoustic transducer and electrovibration transducer are piezoceramic transducers.

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