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Answers for “为什么 BCD(8421 码)是定长编码的一个例子?”

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A fixed-length code is a code in which every source symbol is represented by a codeword containing the same number of bits. The defining property is the equality of codeword length across all symbols, not the equality of the codeword contents themselves.

Conditions: Applies to a single code mapping across all symbols in its alphabet.; The defining property is equality of codeword length, not equality of codeword content.