Constant bit rate (CBR) is a term used in telecommunications, relating to the quality of service. Compare with variable bit rate. Telecommunication involves the transmission of signals over a distance for the purpose of communication. ... In the fields of packet-switched networks and computer networking, the traffic engineering term Quality of Service (QoS, pronounced que-oh-ess) refers to the probability of the telecommunication network meeting a given traffic contract, or in many cases is used informally to refer to the probability of a packet... Variable bit rate (VBR) is a term used in telecommunications and computing that relates to sound or video quality. ...
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. A Codec is a device or program capable of performing encoding and decoding on a digital data stream or signal. ...
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.) In computer science and information theory, Huffman coding is an entropy encoding algorithm used for lossless data compression. ...
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