Active noise elimination device for cabinet type case

Abstract

The invention provides an active noise elimination device for a cabinet type case, which structurally comprises a case noise collecting microphone, an error monitoring and correcting microphone, an active noise elimination loudspeaker and a control module, wherein the control module is composed of a main processor DSP, an audio encoder, an audio conditioning circuit, a processor power adapter and a loudspeaker power supply. According to the invention, a noise source, which is collected by the noise collecting microphone in the active noise elimination device, of the cabinet type case is enabled to act as a reference, and noises are counteracted through anti-noise signals which are generated by the active noise elimination loudspeaker according to real-time feedback of a monitoring error of the error monitoring and correcting microphone by using an existing LMS adaptive algorithm technology, wherein the anti-noise signals and noise signals collected by the noise collecting microphone are identical in frequency but opposite in amplitude. By using the active noise eliminating device, noises, which are generated by rotation of a cooling fan, vibration of a cabinet body and the like, of the cabinet type case can be greatly reduced, and noise pollutions of a work environment are reduced.

Description

technical field [0001] The invention belongs to the field of noise elimination for audio processing, and specifically provides an active noise elimination device for a cabinet type cabinet. Background technique [0002] With the advancement of science and technology, mechanization, intelligence, and automation have gradually become the development trend of today's industrial production and even people's daily life. Under this trend, some large-scale instruments and computers are indispensable equipment. Using this Some cabinets will definitely be used in the equipment, and the noise of the cabinets, especially some large cabinets, has always been a problem that plagues people and needs to be solved. [0003] Talking about the noise cancellation of the chassis, there are many solutions on the market at present that are passive noise cancellation, that is, some sound insulation materials with strong adsorption are used to reduce the noise of the cabinet chassis. On the one han...

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Problems solved by technology

[0003] When it comes to the noise cancellation of the chassis, there are many solutions on the market that are passive noise cancellation, that is, some sound insulation materials with strong adsorption are used to reduce the noise of the cabinet chassis. On the one hand, this solution is not very good. Eliminating the noise of the cabinet cabinet, more importantly, the use of sound insulation materials will often greatly affect the cooling effect of the cabinet cabinet, so that the internal temperature of the cabinet can be maintained at a high level, which will greatly affect the performance and life of the cabinet instrument

[0004] With the proposal of active noise cancellation schemes in recent years, most of the realization of active noise cancellation is done by analog circuits, which makes the operability of noise cancellation equipment extremely low, and requires a higher design of hardware circuits. Require

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