CS Chapter Answers

1. Lossless compression means the data can be retrieved without losing
any of the original information.

True

2. A computer represents information in an analog form. 

False

3. A computer must use the binary number system to represent informa
tion.

False

4. A digital signal represents one of two values at any point in time. 

True

5. Four bits can be used to represent 32 unique things. 

False

6. The signed-magnitude representation of numbers has two representa
tions for zero.

True

7. Overflow occurs when the value that we compute cannot fit into the
number of bits we have allocated for the result.

True

8. In the ASCII character set, there is no distinction made between upper
case and lowercase letters.

False

9. The Unicode character set includes all of the characters in the ASCII 
character set.

True

10. Keyword encoding replaces frequently used words with a single character. 

True

11. Run-length encoding is very good at compressing English text. 

False 

12. Huffman encoding uses variable-length binary strings to represent 
characters. 

True

13. An audio signal is digitized by sampling it at regular intervals. 

True

14. A CD stores audio information in a binary format. 

True
15. The MP3 audio format discards information that can not be heard by 
humans. 

True
16. An RGB value represents a color using three numeric values. 

True
17. Indexed color increases the number of colors that can be used in an 
image, and thus increases the file size. 

False

18. Bitmap, GIF, and JPEG are all examples of raster-graphics formats. 

True
19. Vector graphics represent images in terms of lines and geometric 
shapes. 

True

20. A keyframe is used in temporal compression to represent the changes 
from one frame to another. 

False

21. Analog

22. Signed-magnitude representation

23. Radix

24. Digital

25. Frequency of use

26. Sampling

27. Data compression allows us to save files using less space, it is an important topic because if we can compress it to become smaller things will become faster.

28. lossless data compression means data that can never be lost, losy data compression is data that might get lost

29. Analog is infinite and always continues so it does not fit with a computer.

30. Analog because it is continuous 

31. Breaking information into peices

32. A signal that jumps between two things 

33.
a. four bits 16
b. five bits 32 
c. six bits 64 
d. seven bits 128