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导出单位噪声增益的计算公式,用统计和最优化方法表明9种误差谱成形结构的降噪性能,给出5条等降噪性能曲线。对窄带滤波,新结构可降低噪声10—30dB,降噪性能对滤波器的零点不敏感。新结构的舍入噪声比原来次最优二阶线性状态空间滤波器的并联实现结构降低12—28dB,且带宽愈窄,降噪效果愈佳。
The calculation formula of unit noise gain is deduced, and the noise reduction performance of 9 kinds of error spectrum shaping structures is demonstrated by statistical and optimization methods. Five noise reduction performance curves are given. Narrow-band filter, the new structure can reduce the noise 10-30dB, noise reduction performance is not sensitive to the filter zero. The new structure’s rounding noise is 12-28dB lower than that of the original second-best second-order linear state space filter, and the narrower the bandwidth is, the better the noise reduction effect is.