US 2025/0061880 A1Published application

Vehicle road noise control method and system based on active noise cancellation, electronic equipment and storage medium

AssigneeSuzhou Rarevox Electronics Co., Ltd.

InventorsYongsheng MU, Dengyong MA, Chao YE, Yefeng CAI

Life of this patent

Estimating the term…

Loading patent…

Abstract

Disclosed are a method and system for controlling vehicle road noise based on active noise reduction. The method includes: acquiring a multi-channel reference signal of vehicle road noise; generating a control signal based on a coefficient of a filter at a current time and the multi-channel reference signal, and feeding to a sound reproduction device of the vehicle; acquiring acoustical signals at a plurality of sampling positions inside a compartment of the vehicle to obtain a vector of an error signal; filtering the reference signal to obtain a filtered reference signal; writing the filtered reference signal in a matrix form; and updating the coefficient of the filter. The method actively reduces the road noise caused by friction between vehicle tires and road surface, reduces interior noise pollution, and has a relatively fast convergence speed and relatively high accuracy.

Claims15

Dependent claims

A method for controlling vehicle road noise based on active noise reduction, comprising:

step S1, acquiring a multi-channel reference signal of vehicle road noise, denoted by xk(n), k32 1,2, . . . , K, K being a channel number of the multi-channel reference signal, n representing a sampling time;
step S2, generating a control signal based on a coefficient of a filter at a current time and the multi-channel reference signal, and feeding to a sound reproduction device of a vehicle;
step S3, acquiring acoustical signals at a plurality of sampling positions inside a compartment of the vehicle to obtain a vector e(n) of an error signal;
step S4, filtering the multi-channel reference signal to obtain a filtered reference signal {circumflex over (x)}k,l,m(n), as shown in the following equation,
x
^
k
,
l
,
m
(
n
)
=
∑
i
=
0
N
-
1
s
l
,
m
(
i
)
⁢
x
k
(
n
-
i
)
,
k
=
1
,
2
,
…
,
K
;
l
=
1
,
2
,
…
,
L
;
m
=
1
,
2
,
…
,
M
wherein N is a length of the filter, L is a channel number of the sound reproduction device, M is a number of the plurality of sampling positions, Sl,m represents a transfer function from a l-th loudspeaker to a m-th sampling position, Sl,m(i) is an i-th coefficient of the filter;
xk(n−i) represents a k-th channel of the multi-channel reference signal at previous i sampling times;
step S5, writing the filtered reference signal in a matrix form as shown below,
x
^
(
n
)
=
[
x
^
1
,
1
,
1
⁢
(
n
)
…
x
^
1
,
1
,
M
⁢
(
n
)
⋮
⋱
⋮
x
^
K
,
L
,
1
(
n
)
…
x
^
K
,
L
,
M
(
n
)
]
∈
R
K
·
L
×
M
X
^
(
n
)
=
[
x
^
⁢
(
n
)
⋮
x
^
(
n
-
N
+
1
)
]
∈
R
K
·
L
·
N
×
M
wherein {circumflex over (x)}(n) represents a matrix with a size of K·L rows and M columns, of which elements are composed of the filtered reference signal {circumflex over (x)}k,l,m(n) at a current sampling time;
{circumflex over (X)}(n) represents a matrix with a size of K·L·N rows and M columns, of which elements are composed of the filtered reference signal at the current sampling time and previous sampling times, {circumflex over (x)}(n−N+1) represents a matrix with a size of K·L rows and M columns, of which elements are composed of the filtered reference signal {circumflex over (x)}k,l,m(n−N+1) at previous (N−1)-th time, ∈ RK·L×M represents a matrix with K·L rows and M columns, and ∈ RK·L·N×M represents a matrix with K·L·N rows and M columns;
and
step S6, updating the coefficient of the filter in step S2 according to the following equation,
w
⁡
(
n
+
1
)
=
w
⁡
(
n
)
+
μ
⁢
X
ˆ
(
n
)
[
X
ˆ
(
n
)
T
⁢
X
ˆ
(
n
)
+
δ
⁢
I
]
-
1
⁢
e
⁡
(
n
)
wherein w(n+1) represents an updated coefficient of the filter, which is used to generate an output control signal by filtering at next sampling time n+1, w (n) represents a coefficient of the filter at the current time, μ is a convergence factor, δ is a regularization factor, and I is an identity matrix.

214 more elements

A system for controlling vehicle road noise based on active noise reduction, comprising:

a road noise acquisition device for acquiring a noise or vibration signal caused by friction between wheels and a road surface;
a control device for generating a multi-channel reference signal based on the noise or vibration signal acquired by the road noise acquisition device, and generating a control signal based on a coefficient of a filter at a current time and the multi-channel reference signal;
a sound reproduction device for generating a secondary sound wave for canceling noise in a compartment based on the control signal sent by the control device;
and
an error signal acquisition device for acquiring acoustical signals at a plurality of positions of the compartment to obtain a vector e(n) of an error signal;
wherein the control device is further configured to filter the multi-channel reference signal to obtain a filtered reference signal and write the filtered reference signal into a matrix form, and to update the coefficient of the filter based on the matrix form of the filtered reference signal and the vector of the error signal according to the following equation,
w
⁡
(
n
+
1
)
=
w
⁡
(
n
)
+
μ
⁢
X
ˆ
(
n
)
[
X
ˆ
(
n
)
T
⁢
X
ˆ
(
n
)
+
δ
⁢
I
]
-
1
⁢
e
⁡
(
n
)
wherein w(n+1) represents an updated coefficient of the filter, w(n) represents a coefficient of the filter at the current time, μ is a convergence factor, {circumflex over (X)}(n) is the matrix form of the filtered reference signal, δ is a regularization factor, and I is an identity matrix.

51 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/725,724Filed 18 Nov 2022
Priority: CN 202111683326.531 Dec 2021
Published: 20 Feb 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

G10K 11/17854
Of the filter: the filter being an adaptive filter
B60K 35/10
Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles: input arrangements, i.e. from user to vehicle,…
B60K 35/26
Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor: using acoustic output
G10K 11/17855
Methods, e.g. algorithms; Devices: for improving speed or power requirements

Family

No related US applications are recorded in the indexed filing history.

Timeline

Citations

Open elsewhere

Building an agent or pulling many patents? Use the API or MCP server instead of scraping pages. Get an API key