分析了噪声背景下实谐波过程ARMA模型系数之间的对称性,并以此为约束条件加入ARMA谱估计方法的求解过程中,从而提出了一种改进的正弦信号频率估计方法.理论分析与计算机仿真表明,对于低信噪比条件下的正弦信号参量估计,这一算法的精度与稳定性都优于仅使用总体最小二乘法(SVD-TLS)的ARMA谱估计方法.-Analysis of real harmonic process noise background symmetry between ARMA model coefficients, and a

AD9850内含可编程DDS系统和高速比较器，能实现全数字编程控制的频率合成,信号发生器具有输出频率范围宽，可以输出正弦和方波两种波形，51代码-AD9850 DDS system and includes a programmable high-speed comparator, to achieve all-digital programming control of the frequency synthesizer, the signal generator has an output

(msp430g2553)正弦信号，一方面被adc采集获取其幅度信息，另一方面经比较器变成方波，经Timer捕获获取其频率，然后控制SPWM信号的频率与幅度，使输入与输出同幅同频变化。-(Msp430g2553) sinusoidal signal, on the one hand is to get its amplitude information collected adc, on the other hand by the comparator into a square wave, c