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Interior noise electronic active inhibition system

A technology for active suppression and in-vehicle noise, applied in vehicle components, sound signal devices, circuits or fluid pipelines, etc., to solve problems such as low low-frequency noise effect and poor sound attenuation performance.

Inactive Publication Date: 2012-12-26
SUZHOU KATAIKE ELECTRONICS TECH
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Problems solved by technology

However, since the sound attenuation performance of sound-absorbing and sound-insulating materials becomes worse as the frequency decreases, the passive noise reduction mechanism is more effective for mid- and high-frequency noise, but less effective for low-frequency noise

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Embodiment Construction

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] as attached figure 1 , 2 . The electronic active suppression system for noise in the vehicle of the present invention shown in 3 includes an acoustic sensor, an error microphone, a signal conditioning module, an A / D analog-to-digital conversion module, an ECU electronic control unit, and a D / A digital-to-analog conversion module , loudspeaker, power supply; when the automobile produces automobile noise, the noise collection that described acoustic sensor will produce everywhere, the signal that obtains is arranged and amplified through signal conditioning module; After described A / D analog-to-digital conversion module obtains signal Convert it into a digital signal and input it to the ECU electronic control unit; the ECU electronic control unit performs spectrum analysis on the signal according to the working mode, and when it...

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Abstract

The invention discloses an interior noise electronic active inhibition system, which comprises an acoustic sensor, a signal conditioning module, an analog / digital (A / D) conversion module, an electronic control unit (ECU), a digital / analog (D / A) conversion module and a loudspeaker, wherein an automobile noise signal acquired by the acoustic sensor is trimmed by the signal conditioning module, is converted by the A / D conversion module and is input into the ECU; the ECU performs spectral analysis on the signal, separates the frequency band sensitive to the ears of a human body, detects the waveform through a Fourier algorithm and extracts noise envelope, so that waveform approximately similar to the noise waveform is formed and is subjected to reversal processing; and the inverse phase noise processed by the ECU is converted into a sinusoidal analog signal through the D / A conversion module and is input everywhere by the loudspeaker to be superposed with the automobile noise, and the aim of actively inhibiting the interior noise is fulfilled. The interior noise is actively inhibited through an active noise control method.

Description

technical field [0001] The invention relates to an improvement of a vehicle interior noise suppression system, in particular to an electronic active suppression system for interior noise that can effectively suppress low-frequency noise inside a vehicle, and belongs to the system technical field of vehicle intelligent monitoring and vehicle interior environment improvement. Background technique [0002] With the increasing number of cars, cars have become one of the main sources of urban noise pollution in modern society. In recent years, the rapid development of my country's automobile industry and the construction of a large number of high-grade highways have continuously increased the average speed of automobiles, resulting in higher and higher automobile noise, and the impact of interior noise on automobile ride comfort and user satisfaction , and thus gradually attract people's attention. Relevant experiments have shown that the noise inside the car can easily cause the...

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Application Information

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IPC IPC(8): B60R16/037B60Q5/00
Inventor 黄志强冯宁波陶君毅
Owner SUZHOU KATAIKE ELECTRONICS TECH
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