bit rate

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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 ?
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.
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.
Also, cable operators have the ability to upgrade EGT encoders with feature-rich enhancements, such as variable bit rate and distributed closed-loop encoding.
Parametric Stereo from Coding Technologies and Philips again significantly increases the efficiency of audio codecs for stereo signals at low bit rates.
DTS' new software makes it easy for content creators and manufacturers to prepare any number of DTS audio streams in any format, ranging from low bit rate to the highest quality bit-for-bit multi-channel audio available today, and is compatible with both standard DVD-V and the next generation media," said Brian Towne, Senior Vice President, Consumer / Pro Audio Division at DTS.
The processor's efficient XCode encoding and reprocessing technology can reduce video bit rates while maintaining the same quality as the original content.
DPI RateLock(TM) is a patent-pending technology, ensuring that whenever downstream ad-insertion is planned for one or more of the program streams in a multiplex, the system reserves a preset bit rate for the ads and accounts for that pre-set bit rate in the overall closed-loop encoding process.
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.
EGT's QUARTET is a high-density, constant bit rate (CBR) encoder with up to 4 channels in a 1RU (rack unit) chassis.
CHORUS works by balancing bit rates and optimizing video quality across multiple channels.