The design of codes which are simultaneously DC- and Nyquist-free is considered. The Shannon capacity of codes that are simultaneously DC- and Nyquist-free is tabulated as a function of the number of allowed running digital sum and alternating digital sum states. For this constraint, the set of possible rational capacities is shown to be (1/4,1/2,3/4). A rate 3/4 DC- and Nyquist-free code is used to demonstrate the ability to code at the highest rational capacity available.
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