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System Identification for Acoustic Echo Cancellation Using Stepped Sine Method Related to FFT Size

A stepped sine method was applied for system identification to cancel acoustic echoes in a speaker phone system that has been widely used in recent mobile devices. We applied the stepped sine method by regarding Discrete Fourier Transform (DFT) as a uniform-DFT filter bank. By using this stepped sine method, we were able to obtain more accurate and detailed characteristics of system. We stored the frequency response information into linear transform matrices and estimated the responses of the mobile device speaker. The proposed method exhibited higher Echo Return Loss Enhancement (ERLE) and increased correlation when compared to the conventional method.

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