Sound field and spectra thereof were investigated experimentally by utilizing the heterodyne analysis technique, so that both the screech and the wide-bandnoise can be recorded and studied.
我们对它的声场和频谱作了详细的实验测量，由于采用外差分析技术，冲击噪声的离散谱和宽带谱可同时记录。
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A noise reduction algorithm used in speech signal processes which is referred to as LMS adaptive noise reduction, is also designed to reduce wide-bandnoise but improve signal to noise Ratio.
In this paper, design method for wideband and low noise AGC amplifier is intro-duced. Circuit design and implementation is presented based on some application.