Comments, with reply, on "Effect of various dither forms o quantization errors of ideal A/D converters" by M.F. Wagdy

In the above-titled paper (see ibid., vol.38, p.850-5, Aug. 1989), the effect of dithering on correlation (covariance) between the signal and the quantization error and on the spectrum of quantization errors was addressed. The commenter shows that for the evaluation of the correlation (or covariance) more effective methods exist, and the covariance between the signal and the quantization error can be easily made equal to zero with appropriate dithering. It is also pointed out that the mean value of the signal must be taken into account. Some misunderstandable statements on the error spectrum are stated precisely. The author replies that the commenter misunderstood the original paper and further amplifies his work in support of this assertion.<>