US 12,633,278 B2Granted

Active noise reduction method and device for vehicle and storage medium

AssigneeSuzhou Rarevox Electronics Co., Ltd.

InventorsYongsheng Mu, Dengyong Ma, Chao Ye, Yefeng Cai

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Abstract

Disclosed are an active noise reduction method and device for a vehicle, and a storage medium. The active noise reduction method includes the following steps: generating two reference signals according to a target noise to be denoised; generating a control signal and sending it to a sound reproduction device; filtering the reference signals to obtain filtered reference signals; calculating a noise signal; updating an auxiliary control parameter; calculating an updated auxiliary control parameter-based error signal; and updating the control parameter. The method actively reduces the noise of vehicle engines, reduces interior noise pollution, and has a fast convergence speed.

An active noise reduction method for a vehicle, comprising:

step S1, generating two reference signals x1(n) and x2(n) according to angular frequency ω0 of a target noise to be denoised, wherein n represents time;
step S2, generating a control signal y(n) according to formula (1), and sending it to a sound reproduction device,
y
⁢
(
n
)
=
∑
i
=
1
2
⁢
w
i
(
n
)
⁢
x
i
(
n
)
⁢
i
=
1
,
2
(
1
)
wherein, wi(n) represents a coefficient of a control filter at current time;
step S3, filtering the two reference signals generated in step S1, to obtain filtered reference signals {circumflex over (x)}i(n) as shown in formula (2),
x
ˆ
i
(
n
)
=
∑
k
=
0
N
-
1
⁢
s
k
⁢
x
i
(
n
-
k
)
,
i
=
1
,
2
(
2
)
wherein k=0,1, . . . N−1, N represents a length of the control filter and sk represents a coefficient of a transfer function model filter of a secondary channel,
wherein a transfer function of the secondary channel is a mathematical model of a transmission path from the sound reproduction device to an acoustic signal acquisition device, and
wherein xi(n−k) represents a value of preceding k sampling times of an i-th reference signal;
step S4, calculating a noise signal {circumflex over (d)}(n) according to formula (3),
d
ˆ
(
n
)
=
e
⁢
(
n
)
+
∑
k
=
0
N
-
1
⁢
s
k
⁢
y
⁢
(
n
-
k
)
(
3
)
wherein e(n) represents an error signal of signal processing and y(n−k) represents a value of preceding k sampling times of the control signal sent to the sound reproduction device;
step S5, updating an auxiliary control parameter ŵi according to formula (4),
w
ˆ
i
(
n
+
1
)
=
w
i
(
n
)
+
λ
[
w
i
(
n
)
-
w
i
(
n
-
1
)
]
,
i
=
1
,
2
(
4
)
wherein λ represents a constrain factor and wi(n−1) represents a coefficient of the control filter at a previous sampling time;
step S6, calculating an updated auxiliary control parameter-based error signal ê(n) according to formula (5);
and
e
^
⁢
(
n
)
=
d
ˆ
(
n
)
-
∑
i
=
1
2
⁢
w
ˆ
i
(
n
+
1
)
⁢
x
ˆ
i
(
n
)
(
5
)
step S7, updating a coefficient of the control filter according to formula (6),
w
i
(
n
+
1
)
=
w
ˆ
i
(
n
+
1
)
+
μ
⁢
e
^
⁢
(
n
)
⁢
x
ˆ
i
(
n
)
,
i
=
1
,
2
(
6
)
wherein μ represents a convergence factor and wi(n+1) represents the coefficient of the control filter at a next sampling time.

229 more elements

Facts

Application

18/725,632Filed 18 Nov 2022

Priority

CN 202111683122.131 Dec 2021

Published

US 2025/0087196 A113 Mar 2025

Granted

19 May 2026

Term ends

Not estimatedThe source records don’t support an estimate.

Classification14 codes

G10K 11/17817
Characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms: between the…
G10K 11/17854
Of the filter: the filter being an adaptive filter
G10K 11/17823
Characterised by the analysis of the input signals only: reference signals, e.g. ambient acoustic environment
G10K 11/17825
Characterised by the analysis of the input signals only: error signals

Abstract

Claims12