摘要
运用m序列法测量房间的脉冲响应具有抗噪声能力强等优点,但是测量过程中的微弱非线性干扰会降低测量精度。分析表明:非线性误差分布在整个测量周期内且存在峰值,失真峰值与m序列的三项式对相联系。提出选择时延较小的m序列的三项式对点作为截断点,在该处截断数据可以有效地提高抗失真能力,并且计算方便。仿真实验证实了方法的可行性。
Maximum-length-sequence （m sequence） measurement of home impulse responses promises remarkable gains in error immunity. However,the influence of nonlinearity on m sequence measurement reduces the accuracy of linear impulse response measurement. Analysis shows：nonlinear error distributes in the entire measurement period and spikes which are directly related to the trinomial pairs of m sequence exist. The selection of the point of trinomial pair with smaller delay of m sequence as a truncation point is proposed. As a result, distortion immunity can be enhanced effectively with simple computation. Simulation experiments presented in the paper demonstrate usefulness of our approach.
出处
《信号处理》
CSCD
北大核心
2008年第5期831-834,共4页
Journal of Signal Processing
关键词
M序列
脉冲响应
非线性失真
截断
maximum-length sequences
impulse response
nonlinear distortion
truncation
