基于DSP的动车组车内噪声主动控制系统设计
Interior noise of EMU active control system based on DSP

随着高速铁路大规模开通,运行时噪声随着速度提高而增大,严重影响所在环境下人员的舒适性,因此有必要设计一种基于DSP的噪声主动控制系统。系统由DSP部分和音频部分组成:DSP部分以TMS320VC5509A为核心,扩展了SDRAM存储模块以和电源供电模块;音频部分以TLV320AIC23B为核心搭建语音输入输出模块。DSP和AIC23B采用I2C二线制主从式通信,DSP把AIC23B采集到的声音信号经过计算再返回AIC23B输出。同时通过上位机观察,降噪后声音幅值比降噪前幅值明显下降。实验证明:基于DSP的噪声主动控制系统能有效降低动车组车内噪声,在宽频降噪有待改善。
Due to the massive use of high-speed railway, running noise increases with speed, seriously affecting the comfort of the staff exposed to the operational environment. A DSP-based active noise control system was designed. The system consisted of the DSP part and the audio part. The DSP part took TMS320VC5509A as a core, expanding SDRAM memory modules and power supply modules. The audio part takes TLV320AIC23B as a core, building voice input and output modules. DSP used I2C for communication with AIC23B, which was two-wire and master-slave way. DSP calculated the input from AIC23B and returned the output, while observing the effect in real time via the PC. The noise amplitude decreased obviously after using the system. Experimental results show that the DSP-based active noise control system can effectively reduce interior noise of EMU. Broadband noise reduction needs to be improved