Computer Science 200 – TME/Unit 2 - Chapter 7: Numbering Systems and Data Representations - Discussion Topics #3
What types of compression techniques can be used to make image and sound files smaller?
Image and sound files require a vast amount of data for their representation which translates into these files needing significant storage space. For this reason it is important to compress these files in order to conserve available storage space, minimize bandwidth required for streaming, and reduce file download times. Today’s compression techniques include lossy and lossless.
An example of audio file compression with the use of the lossy technique is seen with the conversion of an MP4 file to an MP3 format. Essentially the human ear is incapable of distinguishing the sounds removed in the compression process which enables the audio file to maintain its quality.
Another common sound file format is WAV which requires significantly more storage space than an MP3 file format. Conversion software applications such as Switch MP3 File Converter for Windows can assist with the process of converting a WAV file into MP3 format. Note that the WAV file is a lossless format which means that it does not compromise audio quality even when it holds compressed data.
Similarly with image files, when compressed using the lossy technique the human eye does not detect the loss of pixels. For photographs, the preferred compressed file format is JPEG.
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References:
- Anderson, G., Ferro, D., & Hilton, R. (2011). Connecting with Computer Science (2nd ed.). Boston, MA: Course Technology, Cengage Learning.
- http://en.wikipedia.org/wiki/Lossy_data_compression
- http://www.buzzle.com/articles/difference-between-mp3-and-mp4-format.html
- http://www.nch.com.au/switch/index.html
- http://www.athleticaid.com/yaquinapress/image/index.html
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