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1.3.4. Bit Rate

Bit rate is the number of bits in a given time period. Bit rate is usually measured in kilobits per second (abbreviated "kbps" or "kb/s"). This measurement is generally used to refer to amount of information stored in a lossy, compressed audio format.
In order to calculate the bit rate, multiply the sample rate and the sample format. For example, the bit rate of an audio CD (705.6 kb/s) is the sample rate (44.1 kHz) multiplied by the sample format (16 bits). MP3-format files are commonly encoded with a 128 kb/s bit rate.