Constant bit rate

The term constant bit rate (CBR) is a term in telecommunications Quality of Service. Compare with variable bit rate.

CBR is also sometimes used to describe a method of encoding audio, where the output of the codec is constrained to produce a constant bit rate. Some other audio codecs use CBR, others are designed to be used in a VBR mode. Both CBR and VBR can be used for MP3 encoding.

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