A comment on 'on prime factor mapping for the discrete Hartley transform'

Lun and Sin (see IEEE Trans. Signal Processing, vol.40, no.6, p.1399-1411, 1982) describe a method of computing prime factor decomposed discrete Hartley transform (DHT) over N points with 2N less additions compared to the existing algorithms of Bracewell and Sorensen (1976). The author shows how the method of Lun and Siu ran be extended to eliminate the 2N extra additions in the algorithms of Bracewell and Sorenson.<
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