August 2024
Beginner
216 pages
5h 24m
English
Content preview from Exploring Computer Hardware
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Lossy & Lossless
Lossy compression methods remove unnecessary or redundant data and is used to compress multimedia files such as photos, videos and audio. Some examples: JPEG images, MP4 videos, MP3 audio
MP3s are compressed using a technique called psycho acoustic compression which is based on how humans hear sounds. For example, a quiet sound immediately following a loud sound is often not heard, so the quiet sound can be removed. Also any audio that falls outside the human audible range of 20Hz to 20Khz can be removed.
Lossless compression methods reduce the file size without removing any data, so the file can be fully reconstructed when decompressed. Some examples are: ZIP
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