问题描述
什么是规范符号位(CSD)，以及如何将二进制数转换为CSD和CSD回到一个二进制数?您怎么知道是否应将CSD的数字规范地选择为+，-或0?
What is a canonical signed digit (CSD) and how does one convert a binary number to a CSD and a CSD back to a binary number? How do you know if a digit of a CSD should be canonically chosen to be +, -, or 0?
推荐答案
有符号二进制在每个2的幂数位置使用三个符号:-1、0、1.所表示的值是位置系数的总和.乘以2的相应乘方，就像二进制的一样，不同之处在于某些系数可能为-1.一个数字在该系统中可以有多个不同的表示形式.
Signed-digit binary uses three symbols in each power-of-two position: -1, 0, 1. The value represented is the sum of the positional coefficients times the corresponding power of 2, just like binary, the difference being that some of the coefficients may be -1. A number can have multiple distinct representations in this system.
规范带符号的数字表示形式相同，但受以下限制:没有两个连续的数字为非0.结果表明，每个数字在CSD中都有唯一的表示形式.
Canonical signed digit representation is the same, but subject to the constraint that no two consecutive digits are non-0. It works out that each number has a unique representation in CSD.
请参见 Parhi的比特级算法中的幻灯片31开始.更多，包括从二进制到CSD的转换算法.
See slides 31 onwards in Parhi's Bit Level Arithmetic for more, including a binary to CSD conversion algorithm.
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