ITM 207 Lecture Notes - Lecture 2: Radix Point
12 Jun 2013
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Analog data: a continuous representation analogous to the actual information it represents. Digital data: a discrete representation, breaking the information up into separate elements. Computers cannot work well with analog data, so we digitize the data. Digitalize: breaking data into pieces and representing those pieces separately. Why do we use binary to represent digitalized data. It only has to deal with 2 levels. By adding 1 bit you double the amount of resolution. Solution : keep all numbers as integers values, with half of them representing negative. Us ing two decimal digits, let 1 through 49 represent 1 through 49 and let 50-99 represent negatives number . Formula to computer the negative representation of a number. Negative (l)= 10^k , where k is the number of digits. Representing negative values: addition and subtraction are the same as in 10"s complement arithmetic. Subtraction reduces to addition of a 2"s complement .
