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level: Data Compression

Questions and Answers List

level questions: Data Compression

Question	Answer
A method which is used to reduce the amount of space needed to store files is known as _________	Compression
What are the common forms of compression that are currently in use?	JPEG, MP3, MPEG and Zip
_________ is a compression technology, which is used to store images.	JPEG
Which is a technique that isn't so widely used these days, to prevent image quality loss during compression?	Run Length Encoding (RLE)
Data compression is the function of _________ in OSI reference model	Presentation Layer
Which are the two general types of compression algorithms?	Lossless and Lossy compression
Which is the compression method where data is same as it was before compression when decompressed?	Lossless Compression
Which are the various algorithms used to implement lossless data compression?	Run length encoding, Differential pulse code modulation and Dictionary based encoding
_________ replaces the consecutive occurrences of a given symbol with only one copy of the symbol along with a count of how many times that symbol occurs	Run-length encoding
In Run length encoding the string AAABBCDDDD is encoded as _________	3A2BIC4D
Which method is also known as a substitution coder in data compression algorithm?	Dictionary-based encoding
_________ is one of the best known Dictionary-based encoding algorithms.	Lempel-Ziv (LZ) compression algorithm
Which is the compression method that does not promise that the data received is exactly the same as data send?	Lossy Compression
Which are the data being used to compress using Lossy compression?	Still images, Video and Audio
_________ are the data being used to compress using Lossless compression?	Executable code, Text files, and Numeric data
What are the two types of techniques used for audio compression?	Predictive encoding and Perceptual encoding
Differences between the audio samples are encoded in _________	Predictive encoding
Predictive encoding is normally used for _________	Speech
Which part of MPEG standard that uses perceptual encoding?	MP3 (MPEG audio layer 3)
Which is a common compression technique in which data is represented as a series of cosine waves?	DCT (discrete cosine transform)
In video compression, when information is removed out of a single frame, it is called	Intraframe or Spatial compression
_________ is a compression method that records only the changes occur in each frame.	Interframe compression
_________ uses the intraframe and interframe compression methods, as well as DCT.	MPEG