Glossary - B

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Back-focus: This is the process for adjusting the position of the lens in relation to the CCD chip. This is to ensure the correct focus for all focal lengths. By adjusting the back focus, you are adjusting the distance between the pick up device and the rear of the lens. Not all lenses have a back focus adjustment.
Balanced Signal: This refers to a type of video signal which is transmitted through a twisted pair cable. It is called balanced because the signal travels through both wires, this way both wires are equally exposed to external interference, so by the time the signal reaches its destination, the end noise will be cancelled at the input of a differential buffer stage.
Balun: Also referred to as a video balun. This device is used to match or transform an unbalanced coaxial cable to a balanced twisted pair cable.
Bandwidth: The amount of frequency space required for an electrical signal. The general rule is: the finer the details a signal has - the wider the spectrum is. A video signals typical bandwidth is 5MHz.
Betamax: Betamax is Sony's domestic video recording format, which is a competitor of VHS.
Bit: Taken from 'binary digit'. Digital information that can only be a 0 or 1.
Black Level: This is part of the video signal, close to the sync level, but slightly aboe it(usually 20mV - 50mV) in order to be distinguished from the blanking level. It electronically represents the black part of an image, whereas the white part is equivalent to 0.7V from the sync level.
BNC: Stands for Bayonet Neil Concelman connector, and it is the most popular connector in CCTV and Broadcast TV for transmitting a basic bandwidth video signal over a coaxial cable.
Byte: A digital word made of eight bits(zeros and ones).

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Glossary - B