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Questions and Answers
What is the primary purpose of lossless compression?
What is the primary purpose of lossless compression?
- To increase the size of digital data
- To reduce the quality of digital data
- To maintain the original quality of digital data (correct)
- To encrypt sensitive information
What is the main difference between lossless and lossy compression?
What is the main difference between lossless and lossy compression?
- Lossless is used for audio files, while lossy is used for video files
- Lossless is used for text files, while lossy is used for image files
- Lossless is faster, while lossy is slower
- Lossless maintains quality, while lossy reduces quality (correct)
What is the purpose of the ZIP archive file format?
What is the purpose of the ZIP archive file format?
- To compress and encrypt files (correct)
- To encrypt files, but not compress them
- To compress files, but not encrypt them
- To store files in a database
What is the term for storing a file's data in less space by minimizing redundancy in the content?
What is the term for storing a file's data in less space by minimizing redundancy in the content?
What is an example of a local OS option for compressing and encrypting local files?
What is an example of a local OS option for compressing and encrypting local files?
Why is encryption important in file compression?
Why is encryption important in file compression?
What is the benefit of using lossless compression in real-time applications?
What is the benefit of using lossless compression in real-time applications?
What is the term for combining multiple files into one file?
What is the term for combining multiple files into one file?
What percentage of the original size is the compressed text after 5 replacements?
What percentage of the original size is the compressed text after 5 replacements?
What is the primary purpose of data compression in communications?
What is the primary purpose of data compression in communications?
Which of the following file formats is an example of lossless compression?
Which of the following file formats is an example of lossless compression?
What is the benefit of using a larger dictionary in data compression?
What is the benefit of using a larger dictionary in data compression?
What is the primary difference between lossless and lossy compression?
What is the primary difference between lossless and lossy compression?
Which organization has defined a standard data compression technique for transmitting and a compression standard for data communications through modems?
Which organization has defined a standard data compression technique for transmitting and a compression standard for data communications through modems?
What is the purpose of pattern matching in data compression?
What is the purpose of pattern matching in data compression?
What type of compression is used in FLAC audio?
What type of compression is used in FLAC audio?
What is the primary advantage of data compression in communication systems?
What is the primary advantage of data compression in communication systems?
What type of compression is used in formats such as JPG and MP3?
What type of compression is used in formats such as JPG and MP3?
Which of the following formats uses lossless compression?
Which of the following formats uses lossless compression?
What is the main difference between FLAC and MP3 compression formats?
What is the main difference between FLAC and MP3 compression formats?
How does compressing a 1MB plain text file to 35% of its original size affect the data transfer time?
How does compressing a 1MB plain text file to 35% of its original size affect the data transfer time?
What is the primary purpose of data compression in backup systems?
What is the primary purpose of data compression in backup systems?
Which of the following is a standardized data compression technique?
Which of the following is a standardized data compression technique?
What is the main advantage of using lossless compression formats such as TIFF and PNG?
What is the main advantage of using lossless compression formats such as TIFF and PNG?
What is the primary goal of compression in data encoding?
What is the primary goal of compression in data encoding?
Which of the following compression techniques is used in GIF files?
Which of the following compression techniques is used in GIF files?
What is the purpose of backing up data?
What is the purpose of backing up data?
Which of the following file formats uses lossy compression?
Which of the following file formats uses lossy compression?
What is the main difference between lossless and lossy compression?
What is the main difference between lossless and lossy compression?
Which of the following is a characteristic of ZIP files?
Which of the following is a characteristic of ZIP files?
What determines the level of compression in lossy compression?
What determines the level of compression in lossy compression?
What is the primary advantage of using proprietary compression file formats like RAR and 7z?
What is the primary advantage of using proprietary compression file formats like RAR and 7z?
What is the primary advantage of using Huffman coding over LZW compression?
What is the primary advantage of using Huffman coding over LZW compression?
What type of compression is used in MP3 audio files?
What type of compression is used in MP3 audio files?
What is the compression ratio achieved in the example of LZW compression?
What is the compression ratio achieved in the example of LZW compression?
Which of the following file formats is an example of a lossy image compression format?
Which of the following file formats is an example of a lossy image compression format?
What is the purpose of using a dictionary in LZW compression?
What is the purpose of using a dictionary in LZW compression?
Which compression technique is used in FLAC audio files?
Which compression technique is used in FLAC audio files?
What is the main drawback of using compression in real-time applications?
What is the main drawback of using compression in real-time applications?
Which of the following file formats is an example of a lossless compressed archive?
Which of the following file formats is an example of a lossless compressed archive?
Lossless compression reduces redundant data by not repeating recurring strings of the same data in formats such as _______ and FLAC.
Lossless compression reduces redundant data by not repeating recurring strings of the same data in formats such as _______ and FLAC.
ZIP, _______, and other general file compression routines are lossless: all original data is completely encoded.
ZIP, _______, and other general file compression routines are lossless: all original data is completely encoded.
________ compression reduces the quality of the original data by discarding some of the data during the compression process.
________ compression reduces the quality of the original data by discarding some of the data during the compression process.
________ is a standardized data compression technique for transmitting and a compression standard for data communications through modems.
________ is a standardized data compression technique for transmitting and a compression standard for data communications through modems.
The CCITT has defined a standard data _______ technique for transmitting and a _______ standard for data communications through modems.
The CCITT has defined a standard data _______ technique for transmitting and a _______ standard for data communications through modems.
________ compression is used in formats such as JPG and MP3.
________ compression is used in formats such as JPG and MP3.
In lossless compression, all original data is completely encoded, which means that the data can be restored to its original _______.
In lossless compression, all original data is completely encoded, which means that the data can be restored to its original _______.
________ coding is a lossless compression technique used in some file formats.
________ coding is a lossless compression technique used in some file formats.
Lossless compression is preferred in applications where ________ of data is critical.
Lossless compression is preferred in applications where ________ of data is critical.
Lossy compression is typically used in formats such as ________ and MP3.
Lossy compression is typically used in formats such as ________ and MP3.
The ________ technique combines frequency of occurrence with Binary Arithmetic Coding.
The ________ technique combines frequency of occurrence with Binary Arithmetic Coding.
The ZIP archive file format uses ________ compression to save space.
The ZIP archive file format uses ________ compression to save space.
Encryption is often used in file compression for ________.
Encryption is often used in file compression for ________.
Data compression is important in communications because it reduces the time for ________ and sending data.
Data compression is important in communications because it reduces the time for ________ and sending data.
In data encoding, minimizing ________ in the content reduces the file size.
In data encoding, minimizing ________ in the content reduces the file size.
Real-time applications often use lossless compression to ensure ________ of data.
Real-time applications often use lossless compression to ensure ________ of data.
The UniSuper pension fund had a proper _______________________ backup with a different provider.
The UniSuper pension fund had a proper _______________________ backup with a different provider.
Data compression is particularly useful in communications because it enables devices to transmit or store the same amount of data in _______________________ bits.
Data compression is particularly useful in communications because it enables devices to transmit or store the same amount of data in _______________________ bits.
TIFF, PNG, and GIF are examples of _______________________ compression formats used by the graphics industry.
TIFF, PNG, and GIF are examples of _______________________ compression formats used by the graphics industry.
FLAC is an example of a _______________________ compression format used by the sound engineering and music industry.
FLAC is an example of a _______________________ compression format used by the sound engineering and music industry.
MP3, AAC, and MP4 are examples of _______________________ compression formats used by the sound engineering and music industry.
MP3, AAC, and MP4 are examples of _______________________ compression formats used by the sound engineering and music industry.
Compression enables devices to transmit or store the same amount of data in _______________________ space.
Compression enables devices to transmit or store the same amount of data in _______________________ space.
Compressing a 1MB plain text file to 35% of its original size reduces the data transfer time to _______________________ seconds per file.
Compressing a 1MB plain text file to 35% of its original size reduces the data transfer time to _______________________ seconds per file.
MPG, MP4, DIVX, XVID, MOV, and AVI are examples of _______________________ compression formats used by the video industry.
MPG, MP4, DIVX, XVID, MOV, and AVI are examples of _______________________ compression formats used by the video industry.
GIF files use ________ lossless compression as part of their file format.
GIF files use ________ lossless compression as part of their file format.
Lossy compression, such as JPG/JPEG, MPG, MP3, and other end-user formats, removes ________ resolutions of the image or sound to achieve high levels of compression.
Lossy compression, such as JPG/JPEG, MPG, MP3, and other end-user formats, removes ________ resolutions of the image or sound to achieve high levels of compression.
The minimal ________ depth captured by GIF images is by design, not an artifact of compression.
The minimal ________ depth captured by GIF images is by design, not an artifact of compression.
Developers decide to adjust the level of compression according to their ________.
Developers decide to adjust the level of compression according to their ________.
ZIP is a general-purpose compression archive, supported on virtually all platforms from mainframes to ________.
ZIP is a general-purpose compression archive, supported on virtually all platforms from mainframes to ________.
RAR, 7z, TAR, and StuffIt are proprietary general-purpose compression file formats with incremental improvements over ________.
RAR, 7z, TAR, and StuffIt are proprietary general-purpose compression file formats with incremental improvements over ________.
A backup is the procedure for making extra copies of data “in case the original is lost or damaged and must be ________.”
A backup is the procedure for making extra copies of data “in case the original is lost or damaged and must be ________.”
A backup includes storing the copy in a geographically ________ location which is platform independent from the original file and host system.
A backup includes storing the copy in a geographically ________ location which is platform independent from the original file and host system.
Lempel-Ziv-Welch compression is a type of _______ compression.
Lempel-Ziv-Welch compression is a type of _______ compression.
Huffman coding is a _______ compression technique used in some file formats.
Huffman coding is a _______ compression technique used in some file formats.
Lossless compression is used in file formats such as _______ and FLAC.
Lossless compression is used in file formats such as _______ and FLAC.
The main difference between lossless and lossy compression is that lossy compression _______ quality for smaller file size.
The main difference between lossless and lossy compression is that lossy compression _______ quality for smaller file size.
ZIP, TAR, and other general file compression routines are _______ : all original data is completely encoded.
ZIP, TAR, and other general file compression routines are _______ : all original data is completely encoded.
Lossy compression is used in file formats such as _______ and MP3.
Lossy compression is used in file formats such as _______ and MP3.
In lossless compression, all original data is completely encoded, which means that the data can be restored to its original _______.
In lossless compression, all original data is completely encoded, which means that the data can be restored to its original _______.
The drawback of using compression in real-time applications is that it needs _______ and primary storage resources.
The drawback of using compression in real-time applications is that it needs _______ and primary storage resources.
Lossless compression reduces redundant data by not repeating recurring strings of the same data in formats such as TIFF and PNG.
Lossless compression reduces redundant data by not repeating recurring strings of the same data in formats such as TIFF and PNG.
Lossy compression reduces the quality of the original data by discarding some of the data during the compression process.
Lossy compression reduces the quality of the original data by discarding some of the data during the compression process.
Huffman coding is a lossy compression technique used in some file formats.
Huffman coding is a lossy compression technique used in some file formats.
The CCITT has defined a standard data compression technique for transmitting and a lossy standard for data communications through modems.
The CCITT has defined a standard data compression technique for transmitting and a lossy standard for data communications through modems.
Lossless compression is typically used in formats such as JPG and MP3.
Lossless compression is typically used in formats such as JPG and MP3.
In lossless compression, all original data is completely encoded, which means that the data can be restored to its original quality.
In lossless compression, all original data is completely encoded, which means that the data can be restored to its original quality.
Lossless compression is preferred in applications where speed of data is critical.
Lossless compression is preferred in applications where speed of data is critical.
The main advantage of using lossless compression formats such as TIFF and PNG is to reduce the file size.
The main advantage of using lossless compression formats such as TIFF and PNG is to reduce the file size.
Lossless compression reduces the quality of the original data by discarding some of the data during the compression process.
Lossless compression reduces the quality of the original data by discarding some of the data during the compression process.
ZIP archives are usually encrypted for security.
ZIP archives are usually encrypted for security.
Lossy compression reduces the quality of the original data by retaining some of the data during the compression process.
Lossy compression reduces the quality of the original data by retaining some of the data during the compression process.
The main difference between lossless and lossy compression is that lossless compression is typically used in real-time applications.
The main difference between lossless and lossy compression is that lossless compression is typically used in real-time applications.
Huffman coding is a lossy compression technique used in some file formats.
Huffman coding is a lossy compression technique used in some file formats.
FLAC is an example of a lossy compression format.
FLAC is an example of a lossy compression format.
The main advantage of using lossless compression formats is that they reduce the quality of the original data.
The main advantage of using lossless compression formats is that they reduce the quality of the original data.
The primary advantage of using lossless compression formats such as TIFF and PNG is that they are smaller in size.
The primary advantage of using lossless compression formats such as TIFF and PNG is that they are smaller in size.
LZW compression is a standardized data compression technique for transmitting and a compression standard for data communications through modems.
LZW compression is a standardized data compression technique for transmitting and a compression standard for data communications through modems.
Huffman coding is a standardized data compression technique for transmitting and a compression standard for data communications through modems.
Huffman coding is a standardized data compression technique for transmitting and a compression standard for data communications through modems.
The primary goal of compression in data encoding is to increase the size of the data.
The primary goal of compression in data encoding is to increase the size of the data.
The primary goal of compression in data encoding is to reduce the quality of the original data.
The primary goal of compression in data encoding is to reduce the quality of the original data.
FLAC audio files use lossy compression.
FLAC audio files use lossy compression.
Lossless compression is typically used in formats such as JPG and MP3.
Lossless compression is typically used in formats such as JPG and MP3.
The primary advantage of using proprietary compression file formats like RAR and 7z is that they are lossless.
The primary advantage of using proprietary compression file formats like RAR and 7z is that they are lossless.
Data compression is particularly useful in communications because it enables devices to transmit or store more data in the same amount of bits.
Data compression is particularly useful in communications because it enables devices to transmit or store more data in the same amount of bits.
ZIP files use lossy compression.
ZIP files use lossy compression.
Lossless compression removes unnecessary data, resulting in a smaller file size.
Lossless compression removes unnecessary data, resulting in a smaller file size.
GIF files use lossy compression.
GIF files use lossy compression.
FLAC audio files use lossy compression.
FLAC audio files use lossy compression.
RAR files are a type of lossy compression.
RAR files are a type of lossy compression.
MP3 files use lossless compression.
MP3 files use lossless compression.
LZW compression is a type of lossy compression.
LZW compression is a type of lossy compression.
Data is always restored to its original quality after decompression in lossy compression.
Data is always restored to its original quality after decompression in lossy compression.
Lempel-Ziv-Welch compression is a lossy compression technique.
Lempel-Ziv-Welch compression is a lossy compression technique.
Huffman coding is a lossless compression technique that is used in image formats like JPEG.
Huffman coding is a lossless compression technique that is used in image formats like JPEG.
The ZIP file format is a lossy compression format.
The ZIP file format is a lossy compression format.
The compression ratio achieved in the example of LZW compression is 50%.
The compression ratio achieved in the example of LZW compression is 50%.
AVIF is a lossy image compression format.
AVIF is a lossy image compression format.
FLAC audio files use lossy compression.
FLAC audio files use lossy compression.
The main advantage of using lossless compression formats is that they sacrifice quality for smaller file size.
The main advantage of using lossless compression formats is that they sacrifice quality for smaller file size.
MP3 audio files use lossless compression.
MP3 audio files use lossless compression.
Study Notes
Data Compression
- Data compression is useful in communications because it enables devices to transmit or store the same amount of data in fewer bits.
- There are various data compression techniques, but only a few have been standardized.
- The CCITT has defined a standard data compression technique for transmitting and a compression standard for data communications through modems.
File Compression Formats
- File compression formats, such as ARC and ZIP, are used to store data in less space.
- ZIP is a popular general-purpose compression archive that is supported on virtually all platforms.
- Other proprietary general-purpose compression file formats include RAR, 7z, TAR, and StuffIt.
How Compression Works
- Compression combines pattern matching and a dictionary to replace repeating strings with a unique code.
- LZW (Lempel-Ziv-Welch) compression and Huffman coding are two techniques used to achieve compression.
- LZW compression replaces duplicate strings using a dictionary, while Huffman coding replaces 8-bit characters with variable bit length symbols based on character frequency.
Lossless vs. Lossy Compression
- Lossless compression removes redundancies but retains all original data.
- Lossless compression is used for data, PNG/TIFF images, and FLAC/ALAC audio.
- Lossy compression sacrifices quality for smaller file size and is used for end-use only, such as JPG images, MP3/AAC audio, and video.
- Lossy compression drops details that may not be noticeable to the human eye or ear.
Compression in Practice
- Compression is used in various industries, such as graphics, sound engineering, and music.
- TIFF, PNG, GIF, and FLAC are used in the graphics and sound engineering industries, while MP3, AAC, and MP4 are used in the music industry.
- MPG, MP4, DIVX, XVID, MOV, and AVI are used in the video industry.
Backup and Restoration
- A backup is the procedure for making extra copies of data in case the original is lost or damaged.
- The procedure includes storing the copy in a geographically separate location that is platform-independent from the original file and host system.
- Restoring data is more important than making backups, as it ensures that the data can be recovered in case of loss or damage.
Data Compression
- Data compression is useful in communications because it enables devices to transmit or store the same amount of data in fewer bits.
- There are various data compression techniques, but only a few have been standardized.
- The CCITT has defined a standard data compression technique for transmitting and a compression standard for data communications through modems.
File Compression Formats
- File compression formats, such as ARC and ZIP, are used to store data in less space.
- ZIP is a popular general-purpose compression archive that is supported on virtually all platforms.
- Other proprietary general-purpose compression file formats include RAR, 7z, TAR, and StuffIt.
How Compression Works
- Compression combines pattern matching and a dictionary to replace repeating strings with a unique code.
- LZW (Lempel-Ziv-Welch) compression and Huffman coding are two techniques used to achieve compression.
- LZW compression replaces duplicate strings using a dictionary, while Huffman coding replaces 8-bit characters with variable bit length symbols based on character frequency.
Lossless vs. Lossy Compression
- Lossless compression removes redundancies but retains all original data.
- Lossless compression is used for data, PNG/TIFF images, and FLAC/ALAC audio.
- Lossy compression sacrifices quality for smaller file size and is used for end-use only, such as JPG images, MP3/AAC audio, and video.
- Lossy compression drops details that may not be noticeable to the human eye or ear.
Compression in Practice
- Compression is used in various industries, such as graphics, sound engineering, and music.
- TIFF, PNG, GIF, and FLAC are used in the graphics and sound engineering industries, while MP3, AAC, and MP4 are used in the music industry.
- MPG, MP4, DIVX, XVID, MOV, and AVI are used in the video industry.
Backup and Restoration
- A backup is the procedure for making extra copies of data in case the original is lost or damaged.
- The procedure includes storing the copy in a geographically separate location that is platform-independent from the original file and host system.
- Restoring data is more important than making backups, as it ensures that the data can be recovered in case of loss or damage.
Data Compression
- Data compression is useful in communications because it enables devices to transmit or store the same amount of data in fewer bits.
- There are various data compression techniques, but only a few have been standardized.
- The CCITT has defined a standard data compression technique for transmitting and a compression standard for data communications through modems.
File Compression Formats
- File compression formats, such as ARC and ZIP, are used to store data in less space.
- ZIP is a popular general-purpose compression archive that is supported on virtually all platforms.
- Other proprietary general-purpose compression file formats include RAR, 7z, TAR, and StuffIt.
How Compression Works
- Compression combines pattern matching and a dictionary to replace repeating strings with a unique code.
- LZW (Lempel-Ziv-Welch) compression and Huffman coding are two techniques used to achieve compression.
- LZW compression replaces duplicate strings using a dictionary, while Huffman coding replaces 8-bit characters with variable bit length symbols based on character frequency.
Lossless vs. Lossy Compression
- Lossless compression removes redundancies but retains all original data.
- Lossless compression is used for data, PNG/TIFF images, and FLAC/ALAC audio.
- Lossy compression sacrifices quality for smaller file size and is used for end-use only, such as JPG images, MP3/AAC audio, and video.
- Lossy compression drops details that may not be noticeable to the human eye or ear.
Compression in Practice
- Compression is used in various industries, such as graphics, sound engineering, and music.
- TIFF, PNG, GIF, and FLAC are used in the graphics and sound engineering industries, while MP3, AAC, and MP4 are used in the music industry.
- MPG, MP4, DIVX, XVID, MOV, and AVI are used in the video industry.
Backup and Restoration
- A backup is the procedure for making extra copies of data in case the original is lost or damaged.
- The procedure includes storing the copy in a geographically separate location that is platform-independent from the original file and host system.
- Restoring data is more important than making backups, as it ensures that the data can be recovered in case of loss or damage.
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Description
Understanding data compression, its importance, and various compression standards and formats.
