Issue No.09 - September (1974 vol.23)
S. Zohar , Jet Propulsion Laboratory, California Institute of Technology
The Appendix of the above paper1 presents a serial sign flipper for radix (-2). Recently, a simpler realization has been brought to the attention of the author. The improved circuit has been developed independently of the published design by H. C. Wilck of the Jet Propulsion Laboratory, Pasadena, Calif. His approach to the problem is quite different from the author's.
S. Zohar, "Comments on "Fast Hardware Fourier Transformation Through Counting"", IEEE Transactions on Computers, vol.23, no. 9, pp. 989, September 1974, doi:10.1109/T-C.1974.224071