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本文提出了矩形窗余弦加权数字滤波器,并推导出该滤波器传输函数的通式,且证明了测量哈达马(Hadamard)方差及修正哈达马(Modified Hadamard)方差的系统的冲激响应与传输函数仅是前者的特列。当用以测量相位噪声谱密度时,余弦加权数字滤波器有其明显的优越性。
In this paper, a rectangular window cosine weighted digital filter is proposed, and the general formula of the filter transfer function is deduced. The impulse response and transmission of the system measuring Hadamard variance and Modified Hadamard variance are proved. The function is only the former special column. When used to measure the phase noise spectral density, cosine weighted digital filter has its obvious advantages.