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 ?
s], the bit rate can be estimated via statistical analysis and a mathematical model.
Based on those results, the bit rate for an item of video content can be estimated.
Thus, the bit rate conversion method introduced in [10] is used with the value of [QP.
Finally, the bit rate for a given video content is estimated using the GOP that is expected to have the maximum number of encoded bits among all GOPs.
The bit rate estimation for a sequence is a time-consuming process since it depends on the number of elements in [T.
The simulated results encoded by the conventional scheme with a fixed bit rate of 2.
con_scheme] indicate the estimated bit rate with the proposed scheme and the fixed bit rate with the conventional scheme, respectively.
The bit rate estimation for a sequence is calculated by encoding the frames.
Table 2 shows the results of bit rate reduction compared to the conventional scheme based on a fixed bit rate.
Reducing the bit rate also reduces the need for storage space as shown in Fig.
The estimated bit rate causes negligible degradation in subjective quality compared to video content encoded using the fixed bit rate as shown in Fig.
This paper has presented a new bit rate estimation scheme using a model based on a given target quality of video streaming services such as IPTV services.