Application of microphone array for speech coding in noisy environment

Z. Li, M. Hoffman
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引用次数: 1

Abstract

To improve speech intelligibility and quality for coding, an array preprocessor is proposed to enhance noisy speech. The microphone array data is processed with a robust quadratically and linearly constrained minimum variance algorithm. The processor nulls noise and/or interference power from arbitrary spatial and frequency locations and maintains speech from desired locations, thus increasing the SNR for subsequent coding. The array and coder (LPC-10, CELP) structure is studied in terms of array processing gain and overall spectral distortion measurement. Preliminary results show that the array gain is transparent to CELP but not necessarily to LPC-10.
麦克风阵列在噪声环境下语音编码中的应用
为了提高语音清晰度和编码质量,提出了一种阵列预处理器来增强带噪语音。采用鲁棒的二次约束和线性约束最小方差算法对麦克风阵列数据进行处理。处理器消除来自任意空间和频率位置的噪声和/或干扰功率,并保持来自所需位置的语音,从而增加后续编码的信噪比。从阵列处理增益和整体频谱失真测量两方面对阵列和编码器(LPC-10, CELP)结构进行了研究。初步结果表明,阵列增益对CELP是透明的,而对LPC-10则不一定。
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