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根据直接数字频率合成的原理,正弦信号可借助正弦—阶梯函数而产生,在这过程中边带和振幅量化噪声也随之出现。然而,按照本文介绍的方法可以按下列方式减少这些噪声,即不象常规的做法那样只用一个单独的正弦—阶梯函数而是用两个这样的函数进行频率合成:在两个时间上互相错开的阶梯函数线性迭加的条件下,可以实现频谱中干扰分量的部分抵消。本文给出了时间错动的最佳值,这是从频谱的研究和振幅误差函数的相关性得到的。
According to the principle of direct digital frequency synthesis, sinusoidal signals can be generated by means of a sine-staircase function, along with sideband and amplitude quantization noise. However, according to the method presented here, it is possible to reduce these noises in the following way. That is, unlike the conventional practice, only a single sine-staircase function is used instead of the frequency synthesis using two such functions as staggered Of the linear function of the step-by-step superposition conditions, the interference component of the spectrum can be partially offset. This article gives the best value for the time shift, derived from the correlation between the spectral study and the amplitude error function.