基于DSP的声反馈抑制系统的研究与实现  

Research and implementation of acoustic feedback suppression system based on DSP

作　　者：肖启洋[1] 张忠慧[1] 方元[1] 

机构地区：[1]南京大学电子科学与工程学院,江苏南京210093

出　　处：《电子技术应用》2013年第1期13-16,共4页Application of Electronic Technique

摘　　要：提出了一种基于TI公司TMS320C6713 DSP和移频法抑制声反馈的有效方法。该方法采用能与之无缝连接的TLV320AIC23 Codec芯片作为语音采集和回放工具,然后基于在Matlab进行仿真达到抑制啸叫相当理想的基础上完成了在DSP上的实时实现。最后,采用主观法和客观法评估了输出语音的质量。结果表明,该方法能有效抑制再生混响干扰,明显提高了扩声增益,且显著改善了频响特性和声音清晰度。This paper puts forward an effective way to suppress acoustic feedback based on TI＇s TMS320C6713 and using fre- quency shift.It adopts the Codec chip TLV320AIC23 to capture and play back speech signal, which can connect with DSP seam- lessly. Then completes real-time implementation on DSP based on simulating and suppressing screaming in Matlab ideally. The re- sult is also evaluated subjectively and objectively. It turns out that it can suppress the interference of the regenerative reverberation, enhance the amplification gain greatly and improve frequency response characteristics and sound articulation obviously.

关 键 词：DSP CODEC 声反馈 啸叫 移频 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]