Noise-Reducing and Effect-Enhancing System for Communication Equipment Mounted on Vehicle

2014 ◽  
Vol 623 ◽  
pp. 161-168
Author(s):  
Lu Chen ◽  
Shi Hai Fan ◽  
Shi Nan Zhang
Keyword(s):  
Noise Reduction ◽  
Noise Control ◽  
Active Noise Control ◽  
Noise Measurement ◽  
Mathematics Model ◽  
Factors Affecting ◽  
Voice Transmission ◽  
First Order ◽  
Active Noise ◽  
Communication Equipment

The noise of communication equipment mounted on Vehicle is one of important factors affecting equipment efficiency. Active Noise Control (ANC) technology is applied to noise reduction of the equipment, and a noise reduction mathematics model is built based on accurate noise measurement. An approach to reduce noise based on first-order differential microphone (FDM) array and ANF technology is proposed, which collects and evaluates environmental noise precisely to enhance voice. This approach improves the conversation effects and realizes full fidelity of voice transmission.

Coherence-based performance analysis on noise reduction in multichannel active noise control systems

2020 ◽  
Vol 148 (3) ◽  
pp. 1519-1528
Author(s):  
Jihui Aimee Zhang ◽  
Naoki Murata ◽  
Yu Maeno ◽  
Prasanga N. Samarasinghe ◽  
Thushara D. Abhayapala ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Noise Reduction ◽  
Control Systems ◽  
Noise Control ◽  
Active Noise Control ◽  
Active Noise

Estimate of aircraft flyover noise reduction by application of active noise control to engine fan tones

1997 ◽  
Author(s):  
R. Kraft ◽  
B. Janardan ◽  
P. Gliebe ◽  
R. Kraft ◽  
B. Janardan ◽  
...  
Keyword(s):  
Noise Reduction ◽  
Noise Control ◽  
Active Noise Control ◽  
Active Noise

Noise Reduction in Ducts Achievable by Point Control

1998 ◽  
Vol 120 (2) ◽  
pp. 216-223 ◽  
Author(s):  
K. A. Morris
Keyword(s):  
Noise Reduction ◽  
Closed Loop ◽  
Noise Control ◽  
Active Noise Control ◽  
Practical Interest ◽  
Noise Levels ◽  
Sensors And Actuators ◽  
One Dimensional ◽  
Active Noise ◽  
Point Control

Noise control in a one-dimensional duct is analyzed. This problem is of practical interest and is also simple enough that a complete theoretical analysis is possible. It is shown that the optimal controller leads to an unstable closed loop. The noise reduction level achievable with a stable closed loop is calculated for arbitrary choices of sensor and actuator locations. This enables the best placement of sensors and actuators to be determined. Also, the analysis indicates that a “spatial waterbed” effect exists in some configurations of active noise control: i.e., that noise levels are increased for points outside of the region over which the design is done.

Improvement of noise reduction performance for a high-speed elevator using modified active noise control

2014 ◽  
Vol 79 ◽  
pp. 58-68 ◽  
Author(s):  
In-Hyung Yang ◽  
Jae-Eun Jeong ◽  
Un-Chang Jeong ◽  
Jin-Su Kim ◽  
Jae-Eung Oh
Keyword(s):  
Noise Reduction ◽  
High Speed ◽  
Noise Control ◽  
Active Noise Control ◽  
Active Noise

KTX Interior-Noise Reduction Performance Comparison Using Multichannel Active-Noise Control

2012 ◽  
Vol 152-154 ◽  
pp. 1891-1898
Author(s):  
Hyeon Seok Jang ◽  
Young Min Kim ◽  
Saehan Kim ◽  
Taeoh Lee ◽  
Kwon Soon Lee
Keyword(s):  
Noise Reduction ◽  
High Speed ◽  
Noise Control ◽  
Active Noise Control ◽  
Sound Field ◽  
Performance Comparison ◽  
High Speed Rail ◽  
Active Noise ◽  
Tunnel Section ◽  
Fxlms Algorithm

In many countries, the use of the KTX high-speed rail has been generalized of late. Therefore, its customers who initially pursued only convenience and speed have begun pursuing quality services such as comfort and stability. Thus, the importance of reducing the noise in the high-speed rail is increasing. The active noise is best choice to reduce noise because of being able to actively reduce the ambient noise coming from the environmental-factor changes. But it’s too hard in a three-dimensional closed-space sound field such as the interior of a high-speed rail. In this study, we used multichannel(2x2) FXLMS algorithm for applying ANC system in KTX. In detail, after measuring the noise inside KTX during its runs in South Korea, multichannel active noise control was simulated to determine the extent to which it can reduce the noise inside KTX. Simulation was done using a multichannel FXLMS algorithm for reducing the actual noise inside KTX and the noise reduction in the open-space section of KTX was compared with that in the tunnel section, and the active-noise-control performances in the low-frequency (below 500 Hz) region were compared.

scholarly journals Output SNR analysis of integrated active noise control and noise reduction in hearing aids under a single speech source scenario

2011 ◽  
Vol 91 (8) ◽  
pp. 1719-1729 ◽  
Author(s):  
Romain Serizel ◽  
Marc Moonen ◽  
Jan Wouters ◽  
Søren Holdt Jensen
Keyword(s):  
Noise Reduction ◽  
Hearing Aids ◽  
Noise Control ◽  
Active Noise Control ◽  
Active Noise ◽  
Output Snr
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