摘要
提出了一种在频域实现的基于传声器阵列超增益波束形成的语音增强方法。该方法利用小孔径线列阵端射方向具有超增益的特性,针对均匀噪声场,设计出相应的超增益权,形成超增益波束。基于超增益波束形成的输出相对常规处理,可大幅度提高信噪比。仿真了间距为0.05m的5元均匀线性传声器阵列接收到的端射方向带噪线性调频信号和语音信号,并进行超增益处理,获得12dB左右的阵增益,从而表明超增益传声器阵列具有优越的性能。
A speech enhancement approach based on super gain beamforming of microphone array in frequency domain is proposed in this paper. The super gain property of small aperture linear microphone array at endfire direction is used to design beamforming weights for spherical isotropic noise field. The array output from super gain beamformer can significantly improve the signal-to-noise ratio （SNR）. Simulation experiments were carried out for a five element superdirective microphone array with 0.05m inter-element spacing. The array gain about 12 dB was obtained for linear frequency modulation signal and speech signal with additive noise, which showed the superiority of super gain microphone array.
出处
《电声技术》
2006年第1期44-47,共4页
Audio Engineering
关键词
传声器阵列
超增益
波柬形成
语音增强
领域
microphone array
super gain
beamforming
speech enhancement
frequency domain
