COMPUTER NETWORKING

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MULTIMEDIA AND QUALITY OF SERVICE

COMPRESSION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A song is digitally recorded by an artist and saved to a file. Then, the artist runs a program that takes the file as input and produces a new file. The new file does not include any sound data recorded that cannot be heard by the human ear. The artist then saves the new file over the original file. Which of the following is true about the transformation of the digitally recorded song data?
A
This is a lossy transformation of data that results in a smaller file size.
B
This is a lossy transformation of data that results in a larger file size.
C
This is a lossless transformation of data that results in a smaller file size.
D
This is a lossless transformation of data that results in a larger file size.
Explanation: 

Detailed explanation-1: -Image compression is a process applied to a graphics file to minimize its size in bytes without degrading image quality below an acceptable threshold. By reducing the file size, more images can be stored in a given amount of disk or memory space.

Detailed explanation-2: -Natarajan and K. R. Rao in 1973. JPEG was introduced by the Joint Photographic Experts Group (JPEG) in 1992. JPEG compresses images down to much smaller file sizes, and has become the most widely used image file format.

Detailed explanation-3: -Lossless compression retains values and manages to lower file size. However, lossy compression reduces file size by eliminating redundant information. While LZ77 is an example of lossless compression, JPEG is an example of lossy compression.

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