摘要
主要针对电话系统中的线路回声进行研究,分析了线路回声的基本原理与抑制方法,深入研究、设计并实现了基于IPNLMS自适应算法的回声抵消算法。测试结果表明,所设计算法能够很好地抵消延迟长达120 ms以内的回声信号,语音质量的PESQ得分值由回声抵消前的2.2分左右提高到回声抵消后的3.5分以上。
The echo of telephone line system is studied, and the basic principles and suppression method are analyzed. The echo offset algorithm based on IPNLMS adaptive algorithm is researched in depth, designed and realized. The test resuits show that the algorithm can offset up to 120 ms delay, and the PESQ value increase from 2.2 before to above 3.5 after.
出处
《电声技术》
2014年第6期35-43,共9页
Audio Engineering
