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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Canonical signed digit ： ウィキペディア英語版 Canonical signed digit In computing canonical-signed-digit (CSD) is a special manner for encoding a value in a signed-digit representation, which itself is non-unique representation and allows one number to be represented in many ways. Probability of digit being zero is close to 66% (vs. 50% in two's complement encoding) and leads to efficient implementations of add/subtract networks (e.g. multiplication by a constant) in hardwired digital signal processing. The representation uses a sequence of one or more of the symbols, -1, 0, +1 (alternatively -, 0 or +) with each position possibly representing the addition or subtraction of a power of 2. For instance 23 is represented as +0-00-, which expands to $+2^5\; -2^3\; -2^0$ or $32\; -\; 8\; -\; 1\; =\; 23$ ==Implementation== CSD is obtained by transforming every sequence of zero followed by ones (011...1) into + followed by zeros and the least significant bit by - (+0....0-). As an example: the number 7 has a two's complement representation 0111 :$(7=0\backslash times\; 2^3+1\backslash times\; 2^2+1\backslash times\; 2^1+1\backslash times\; 2^0\; =\; 4+2+1)$ into +00- :$(7=+1\backslash times\; 2^3+0\backslash times\; 2^2+0\backslash times\; 2^1-1\backslash times\; 2^0\; =\; 8-1)$ 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Canonical signed digit」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.