摘要
介绍了一种手机中使用的指向性双传声器噪声消除系统。系统采用两个灵敏度一致性较好的全指向性传声器,形成锥形指向性拾音波束,只接收120°范围以内的信号,大大减少拾音波束之外的噪声干扰;紧接着使用单通道语音增强算法,可进一步衰减采集到信号中的背景噪声。实验结果表明,该系统在保持了较小的语音失真的前提下,对于各种类型的背景噪声下的语音信号有30～50dB的信噪比提升,5dB信噪比的含噪语音PESQ评分有0.8～1.0的提升。
A dual-microphone directional noise cancellation system in mobile phone is presented. This system uses two omni-directional microphones which have good coherence in sensitivity to form a cone-shape sound collection beam. The beam only collects sound which comes from the range of 120 degrees, so background noise outside the beam is largely suppressed. A speech enhancement algorithm is followed and can further suppress the collected background noise. Experiments show that, with little speech distortion, the system has good result. A 30 to 50 dB SNR increasement can be achieved and the PESQ-MOS raise is 0.8 to 1.0 at SNR 5 dB.
出处
《电声技术》
2011年第6期61-66,共6页
Audio Engineering
关键词
手机
双传声器
指向性
语音增强
mobile phone
dual-microphone
directivity
speech enhancement
