Abstract
The following article treats a subject which, because of its importance to computer as well as communications engineers, has come in for considerable discussion in these pages in the past. This latest contribution to the continu ing discussion is reproduced through the courtesy of Com munications Designer's Digest, the copyright owners, who published it in their volume 2 number 3 issue of March 1968. This version, however, has been revised somewhat by Mr. Cipperly.—Ed.
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