Bit rate
In
telecommunications and
computing, bitrate (sometimes written bit rate, data rate or as a
variable R or fb) is the number of
bits that are conveyed or processed per unit of time. Bit rate is synonymous to data rate and
digital bandwidth. The bit rate is quantified using the 'bit per second' (bit/s or bps) unit, often in conjunction with a
SI prefix such as
kilo- (kbit/s or kbps),
mega- (Mbit/s or Mbps),
giga- (Gbit/s or Gbps) or
tera- (Tbit/s or Tbps). In digital communication systems, the gross bitrate, raw bitrate,
data signaling rate or
line rate is the total number of physically transferred bits per second over a communication link, including useful data as well as protocol overhead.
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bit rate (BR)
In a
bit stream, the number of bits occurring per unit
time, usually expressed in
bits per second. (
188 ) Note: For n-ary
operation, the bit rate is equal to log2n times the rate (in bauds), where n is the number of significant conditions in the
signal.
bit rate•distance product
bit rate
<
communications,
digital signal processing> (Or "bitrate") A
data rate expressed in bits per second. This is a similar to
baud but the latter is more applicable to channels with more than two states.
The common units of bit rate are
kilobits per second (Kbps) and
megabits per second (Mbps). In data rates, the multipliers "k", "M", etc. stand for powers of 1000 not powers of 1024.
The term is also commonly used when discussing digital
sampling and
sample rates. For example, the
MP3 audio
compaction algorithm is often set to ouput files with a bitrate of 120 kbps. This means that the file contains an average of 120 kilobits for each second of audio (900 KB per minute). This compares with
CD audio which is encoded at 44100 16-bit stereo samples per second or 1408 kbps.
(2003-05-19)
(c) Copyright 1993 by Denis Howe
bit rate
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