Sound pressure eliminator, sound pressure elimination system and method
A technology for canceling devices and eliminating errors, which is applied in the direction of sound-emitting devices and instruments, and can solve problems such as interference sources bringing in environmental noise, jammers that cannot adjust the interference effect, and affecting indoor personnel conversations, etc. Good effect of laser eavesdropping
Inactive Publication Date: 2015-06-03
INST OF INFORMATION ENG CHINESE ACAD OF SCI
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] 1) The interference source brings in new environmental noise, which affects the conversation of indoor personnel;
[0006] 2) The jammer cannot adaptively adjust the jamming effect according to the environmental sound conditions, and needs manual adjustment
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0052] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0053] figure 1 It shows a schematic structural view of the sound pressure eliminator provided by Embodiment 1 of the present invention, the sound pressure eliminator is installed at the first preset distance in front of the indoor glass, including:
[0054] The collection unit 11 is used to collect the sound signal at the first preset distance f...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a sound pressure eliminator, which is arranged in a first preset distance part in front of indoor glass and comprises a collecting unit, a reverse phase unit and a playing unit, wherein the collecting unit is used for collecting sound signals in a position with the first preset distance from the front side of the indoor glass, the reverse phase unit comprises a filter and a wave trap and is used for carrying out reverse phase processing on the sound signals to obtain reverse phase sound signals, the playing unit is used for playing the reverse phase signals, after the reverse phase sound signals are played, the reverse phase sound signals and the sound signals are mutually counteracted, and the sound pressure of the sound signals on the indoor glass is reduced. The sound pressure eliminator can realize the laser eavesdropping proofing under the condition of not introducing an interference source.
Description
technical field [0001] The invention relates to the field of information security, in particular to a sound pressure canceller, a sound pressure cancel system and a method. Background technique [0002] The existing laser eavesdropping equipment irradiates the glass of the place to be eavesdropped by remote non-visible laser light, and the sound generated when the people in the room talk produces sound pressure on the glass and deforms, thereby causing the laser to deflect, which can be restored by photoelectric receiving equipment out the original voice. [0003] The existing technology achieves the purpose of anti-eavesdropping by applying noise interference to the glass, installing the jammer on the glass, sending random mixed sound waves, masking and interfering with the glass vibration caused by the sound waves at the scene of the conversation, and blocking the source of eavesdropping. [0004] As can be seen from the above description, the defects in the prior art are...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/178
Inventor 陈佐王妍吕彬毛锐
Owner INST OF INFORMATION ENG CHINESE ACAD OF SCI