In this paper, two microphone based systems for audio zooming is proposed for the first time. The audio zooming application allows sound capture and enhancement from the front direction while attenuating interfering sources from all other directions. The complete audio zooming system utilizes beamforming based target extraction. In particular, Minimum Power Distortionless Response (MPDR) beamformer and Griffith Jim Beamformer (GJBF) are explored. This is followed by block thresholding for residual noise and interference suppression, and zooming effect creation. A number of simulation and real life experiments using Samsung smartphone (Samsung Galaxy A5) were conducted. Objective and subjective measures confirm the rich user experience.

中文翻译：

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用于智能手机的两通道音频缩放系统

在本文中，首次提出了两个基于麦克风的音频缩放系统。音频缩放应用程序允许从正面捕获和增强声音，同时衰减来自所有其他方向的干扰源。完整的音频缩放系统利用基于波束成形的目标提取。特别是，探索了最小功率无失真响应 (MPDR) 波束成形器和格里菲斯吉姆波束成形器 (GJBF)。然后是用于残余噪声和干扰抑制的块阈值处理，以及缩放效果的创建。使用三星智能手机（三星 Galaxy A5）进行了大量模拟和现实生活实验。客观和主观的衡量标准证实了丰富的用户体验。