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Road and engine noise control

A noise control and engine technology, applied in active noise control, sounding equipment, musical instruments, etc.

Active Publication Date: 2018-06-08
HARMAN BECKER AUTOMOTIVE SYST
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, these two techniques require different sensors and different signal processing in order to observe road noise and engine order-related noise, so usually two separate systems are used side by side

Method used

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Embodiment Construction

[0014] Noise is generally a term used to designate sounds that do not contribute to the informative content of the receiver but are considered to interfere with the audio quality of the desired signal. The evolution of noise is usually divided into three stages. These stages are noise generation, propagation (emission), and perception. It can be seen that attempts to successfully reduce noise initially target the noise source itself, eg by attenuating the noise signal and subsequently by suppressing the propagation of the noise signal. In many cases, however, the emission of noise signals cannot be reduced to a desired level. In this case, the concept of removing undesired sounds by superimposing compensation signals is applied.

[0015] Known methods and systems for canceling or reducing emitted noise suppress unwanted noise by generating canceling sound waves to be superimposed on the undesired signal, the amplitude and frequency values ​​of the canceling sound waves being...

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Abstract

Exemplary road and engine noise control systems and methods include directly picking up road noise from a structural element of a vehicle to generate a first sense signal representative of the road noise, directly picking up engine noise from an engine of the vehicle to generate a second sense signal representative of the engine noise, and combining the first sense signal and the second sense signal to provide a combination signal representing the combination of the first sense signal and the second sense signal. The systems and methods further include broadband active noise control filteringto generate a filtered combination signal from the combination signal, converting the filtered combination signal provided by the active noise control filtering into anti-noise and radiating the anti-noise to a listening position in an interior of the vehicle. The filtered combination signal is configured so that the anti-noise reduces the road noise and engine noise at the listening position.

Description

technical field [0001] The present disclosure relates to road and engine noise control systems and methods. Background technique [0002] In a similar manner to Active Noise Control (ANC) technology, Road Noise Control (RNC) technology reduces unwanted road noise in the car by generating anti-noise, that is, sound waves that are in opposite phase to the sound waves to be reduced. RNC technology uses noise and vibration sensors to pick up unwanted noise and vibration generated by tires, body parts, and rough road surfaces that cause or transmit noise and vibration. The result of eliminating this noise is a more enjoyable ride, and it allows automakers to use lightweight chassis materials that increase fuel mileage and reduce emissions. Engine order noise cancellation (EOC) technology uses a non-acoustic signal, such as a repetitions per minute (RPM) sensor representing engine noise, as a reference to generate sound waves that are out of phase with the audible engine noise in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/178
CPCG10K2210/1282G10K2210/12821G10K2210/129G10K2210/3027G10K2210/3031G10K2210/501G10K2210/512G10K11/17823G10K11/17881G10K11/17825G10K11/17883G10K11/17854G10K11/17857G10K2210/3026G10K2210/3028
Inventor M.克里斯托夫
Owner HARMAN BECKER AUTOMOTIVE SYST
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