计算机概论教学（英文版）华南理工-Ch-02.pdfVIP

CHAPTER 2 Data Representation Review Questions 1. Text, numbers, images, audio, and video. 2. All data types from outside the computer are transformed into a uniform represen- tation when stored in the computer and then transformed back when leaving the computer 3. A bit pattern is a string of bits (0s or 1s) in a particular order. 4. ASCII uses 7 bits to represent a character and can represent up to 128 different symbols. Extended ASCII uses 8 bits to represent a character and can represent up to 256 different symbols. The first 128 symbols to are the same as the ASCII code while the remaining symbols tend to be a non-standard, manufacturer-specific code. 5. EBCDIC stands for Extended Binary-Coded Decimal Interchange Code. IBM developed this code which is used only in its mainframes. It uses 8 bits to represent a character and can represent up to 256 different symbols. n 6. A bit pattern of length n can represent 2 different characters. 7. The bit pattern represents the color for each pixel (picture element) in a matrix of pixels that represents the image. 8. The advantage of the vector graphic method is that the image is clearer when it is rescaled. 9. Sampling - The magnitude of the signal is measured at regular intervals. Quantization - The sample is assigned a value from a set. Coding - The quantiz