In-vehicle active noise reduction system

Abstract

The invention provides an in-vehicle active noise reduction system which comprises a rotation speed sensor, an active noise reduction controller, a mixer, a power amplifier, an error microphone, a vehicle-mounted speaker, a vehicle-mounted audio processing module, a car CAN interface, a ceiling wiring and a carpet wiring. The rotation speed sensor is connected with the car CAN interface and is connected with the active noise reduction controller through the carpet wiring. The error microphone is arranged on the ceiling and is connected with the active noise reduction controller through the ceiling wiring. The active noise reduction controller is arranged in a vehicle trunk. The active noise reduction controller outputs four active noise reduction acoustic signals. The signals are first output to the mixer, and then are output to the front left interface, the front right interface, the rear left interface, the rear right interface and the ground wire interface of the vehicle-mounted power amplifier through the mixer. The output of the active noise reduction controller is connected with the mixer through the carpet wiring. According to the invention, the transformation of the original vehicle is minimized; the hardware connection and arrangement of the active noise reduction system are simple; and the system is convenient to implement.

Description

technical field [0001] The invention relates to the connection and arrangement of an active noise reduction system in a vehicle, and belongs to the professional field of active noise control. Background technique [0002] The NVH level of the vehicle directly affects the driving experience of passengers, and a quiet and comfortable interior environment is becoming the pursuit of more and more drivers and passengers. Traditional passive solutions mainly use noise reduction technologies such as sound insulation, vibration isolation, noise elimination and sound absorption to reduce noise. These technologies are more effective for high-frequency noise reduction, but not ideal for annoying low-frequency sounds. , while the active noise control technology mainly has a good effect on low-frequency frequencies in terms of car noise, and has obvious advantages in being clearly pertinent and conducive to the lightweight and convenience of cars. [0003] At present, there are many man...

AI Technical Summary

Problems solved by technology

Traditional passive solutions mainly use noise reduction technologies such as sound insulation, vibration isolation, noise elimination and sound absorption to reduce noise. These technologies are more effective for high-frequency noise reduction, but not ideal for annoying low-frequency sounds. , and the active noise control technology is mainly effective in targeting low-frequency frequencies in terms of automotive noise, and has obvious advantages in being clearly targeted and conducive to the lightweight and convenience of automobiles.

[0003] At present, there are many manufacturers and teams researching active noise reduction technology at home and abroad. There are relatively mature commercial applications in foreign countries, and they have been applied to many models. Domestic related manufacturers are also actively researching, but there is no mature commercial application yet. The launch of chemical products is still mainly in the stage of theoretical research

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