【摘要】 话音的降噪与静噪是短波无线电台的需要实现的重要功能之一。文章以TMS320F2812 DSP芯片为核心设计实现一种能在短波转接电台中使用的语音降噪、静噪处理系统。首先,利用最小均方(LMS)误差自适应滤波算法对短波电台接收到的可能含有语音和噪声的信号进行消噪处理,得到较高信噪比的接收信号。然后,在噪声信号背景下应用短时自相关算法检测接收信号中是否含有语音,从而实现短波电台的数字静噪功能。通过对系统硬件电路和信号处理算法的测试,该系统能较好地完成短波电台接收信号的语音检测与处理功能。更多还原

【Abstract】 The voice de-noising and squelching is an important function the shortwave radio must implement.With TMS320F2812 DSP chip as the core,the voice de-noising and squelch processing system used in the shortwave radio is designed and implemented.First,by using the least mean square(LMS)error adaptive filtering algorithm to denoise and squelch the signal with voice and noise received by shortwave radio station,a higher signal to noise ratio of the received signal is obtained.Then,the short-time autocorrelation algorithm is used to test whether the received signal contains the voice under the noise background,thus realizing the digital squelching function of the shortwave radio.Test on to the system hardware circuit and the signal processing algorithm indicates that,this system can fairly accomplish the voice detection and processing function of the received signal by shortwave radio.更多还原