车载免提系统去噪声及回声的研究

针对车载免提系统去噪声去回声的问题,根据车内具体环境,采用改进的串联自适应回声抵消器结构及改进的谱减法来去除噪声,用带有DTD结构和改进的自适应NLMS算法来实现回声的去除,并用TI公司的DSP TMS320VC5402作为处理单元,实现了车载免提系统的去噪声去回声.实验结果表明,系统的可靠性和稳定性好、加快了收敛速度、提高了信噪比.

The Research of Noise Reduction and Echo Cancellation Based on Vehicle Hand-free Phone System

In view of the problem of noise reduction and echo cancellation based on vehicle hand-free phone system,according to the environment in the car,the article uses a kind of improved serial adapted echo cancellation machine structure.Noise is reduced by using the improved spectrum subtraction method and echo is cancelled by using improved adapted algorithm and DTD structure.Noise reduction and echo cancellation are implemented based on vehicle hand-free phone system with DSP TMS320VC5402 of TI Corporation as processor.The study indicates that the reliability and the stability are excellent,and convergence process is speeded up and SNR is increased.