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Constant bit rate - Definition and Overview |
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The term constant bit rate (CBR) is a term in telecommunications Quality of Service. Compare with variable bit rate.
When referring to codecs, constant bit rate encoding means that the rate at which a codec's output data should be consumed is constant. CBR is useful for streaming multimedia content on limited capacity channels since it is the maximum bit rate that matters, not the average, so CBR would be used to take advantage of all of the capacity. CBR would not be the optimal choice for storage as it would not allocate enough data for complex sections (resulting in degraded quality) while wasting data on simple sections.
Most coding schemes such as Huffman coding or run-length encoding produce variable-length codes, making perfect CBR difficult to achieve. This is partly solved by varying the quantization (quality), and fully solved by the use of padding. (However, CBR is implied in a simple scheme like reducing all 16-bit audio samples to 8-bits.)
See Also
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Example Usage of Constant |
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LOUSYTSHIRTS: I am a Constant downer thus I am not getting anything this year for x-mas except for this lousy t-shirt http://bit.ly/8B0YQ2 #lousytshirts |
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fuhleesh22: Photo: my mother. who never smiles in photos, haha she is the Constant in my life. the one person I can turn... http://tumblr.com/xkj49rjk2 |
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kenya_sl4l: Constant Contact Survey Results How often did you or members of... http://tinyurl.com/y89lerc |
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