| STFT及其在回声消除方面的应用 |
| STFT and Its Application to Echo Cancellation |
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| 中文摘要: |
| 论述了STFT(Short-Time Fourier Transform)理论及其特点，设计了一个在桌面音频系统中由于麦克风和听筒的耦合而产生语音干扰(主要是回声)的消除系统，该系统利用STFT将所需信号和噪声信号变换到频域，通过频谱相减消除噪声。提出了一个基于多信道回声消除器的子带最小二乘滤波器理论分析和估算方法，该方法具有较强的自适应能力、算法收敛快、控制精度高。 |
| 英文摘要: |
| The theory of Short-time Fourier Transform and its character are introduced in this paper. The cancellation system of echo interference caused by the coupling of the microphone and the receiver in the table VF system is designed. Using STFT, this system can transfer the necessary signal and the noise signal into the frequency field and the noises can be eliminated through the subtraction of spectrum. The theoretical analysis and estimation methods of subband least square filter based on multichannel echo suppressor are given. This method has stronger self-adaption ability, rapid algorithm convergence and high control accuracy. |
| 梁英 史仪凯 |
| 西北工业大学机电学院，西北工业大学机电学院 陕西 西安 710072，陕西 西安 710072 |
| 中文关键词: STFT，VOIP（Voice Over IP） 频谱相减 RLS算法 回声消除 |
| 英文关键词:STFT,VOIP,subtract the frequency chart,RLS arithmetic,echo cancellation |
| 基金项目:国家自然科学基金资助项目(50275125)
航空科学基金资助项目(04I53068) |
| DOI： |
| 引用本文：梁英,史仪凯.STFT及其在回声消除方面的应用[J].计测技术,2005,25(3):11~12,18. |
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