Monday 19 March 2012

Task 2 - Video Fact File - Data Rate

Data rate – A data rate is the rate at which information being transferred. It is expressed in terms of amount of information per unit of time. For example, a common type of data rate used when describing the speed of a hard drive is Megabytes.

Another example would be kilobits, which is often used with compressed audio files. Once the consumer determines the data rate at which the information is being transferred, it becomes possible to figure out how much hard drive space they'll need to store the video.

KBPS – kilobits per second - A small "b" indicates a measure of bits, however, a large "B" indicates a measure of bytes. There are 8 bits within a byte.

For example:
4320KBps = approximately 34,000 Kbps
4320Kbps = approximately 500 KBps
Kbps stands for kilobits per second - thousands of bits per second and is a measure of bandwidth - the amount of data that can flow in given time on a data transmission medium.
Higher bandwidths are more conveniently expressed in megabits per second - Mbps, or millions of bits per second and in gigabits per second - Gbps, or billions of bits per second.

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