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While often referred to as "speed", bit rate does not measure distance/time but number of bits/time, and thus should be distinguished from the "propagation speed" (which depends on the transmission medium and has the usual physical meaning).
The formal abbreviation for "bit per second" is "bit/s" (not bits/s). In less formal contexts the abbreviatons b/s or bps are often used, though this risks confusion with " bytes per second" (B/s). Even less formally, it is common to drop the "per second", and simply refer to "a 128 kilobit audio stream" or "a 100 megabit network".
"Bit rate" is sometimes used interchangeably with " baud rate", which is only the same if each bit occurs in a unit interval.
For large bitrates, SI prefixes are used, not binary prefixes:
There are typically eight bits in a byte (octet), but communications data rates are almost never expressed in bytes per second, with the notable exceptions of disk and memory I/O transfer rates. To convert from byte/s to bit/s, simply multiply by 8.
If lossy compression is used on audio/visual data, differences from the original signal will be introduced in the form of compression artifacts. Whether these affect the subjective quality, and if so how much, depends on the compression scheme, encoder power, the characteristics of the input data, and the listener's familiarity with artifacts; experts may detect artifacts in a lot of cases where the average listener would not.
The bitrates in this section are approximately the minimum that the average listener (when using state-of-the-art compression) would consider not significantly worse than the reference standard:
Note that because of advancing technology, the actual bitrates used by some of the compared-to devices is significantly higher. For example:
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