bit rate


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Related to bit rate: baud rate

bit rate

[′bit ‚rāt]
(communications)
Quantity, per unit time, of binary digits (or pulses representing them) which will pass a given point on a communications line or channel in a continuous stream.

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.

bit rate

(1) See data rate.

(2) The speed that digital audio and video files are encoded (compressed), measured in kilobits (Kb) and megabits (Mb) per second. For example, MP3 audio files can be created with bit rates from 16 Kbps to 320 Kbps, with 128 Kbps being fairly common. Video formats also run the gamut, from as little as 10 Mbps for preview frames to 400 Mbps and higher for HD.

The higher the bit rate, the less compression and the better the audio or video quality. It is sometimes extremely difficult to hear or see the difference unless comparing content with bit rates that are far apart. See space/time.
References in periodicals archive ?
JVC believes that variable bit rate technology is appropriate for disc applications as well as to realize many channels in a certain transmission capacity, such as picture transmission through CATV and telecommunications lines.
Automatic variable bit rate coding through new rate control system: Average bit rate can be automatically chosen based on total recording time of software.
Reduction of mastering time: Mastering time is about half that of fixed bit rate technology.
5 (extensions of MPEG-1) layer 1/2/3 (MP3) encoding with support for joint stereo coding for better efficiency and support for the constant bit rate format.
It provides audio at high constant bit rates superior to standard DVDs to produce outstanding quality.
264 video compression, ensuring an excellent image quality and enabling full frame rates at low bit rates.
ATEME's customers benefit from the highest quality video at the lowest bit rates.
Rim Semiconductor has developed a new and very different very-high-speed DSL that achieves higher bit rates than VDSL2 on both short and long loops," says Dr.
Embarq achieves higher bit rates on short loops and long loops from 40% to more than 100% versus VDSL2 (12a), so carriers can offer IPTV services
Service providers using Envivio systems can reduce their operational costs by making their existing infrastructure more efficient while offering the highest quality video services at the lowest possible bit rates.