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Bandwidth
A range of frequencies used to transmit information such as picture and sound. For TV broadcasters, the FCC has allocated 6Mhz for each channel. For DTV, the maximum bit rate possible within the bandwidth is 19.4 Mbps, which is one HDTV channel. SDTV has a lower bit rate, therefore the bandwidth can accommodate more than one channel.

Bass
Low frequencies; those below approximagtely 200Hz.

Bit Rate
Measured as "bits per second," and used to express the rate at which data is transmitted or processed. The higher the bit rate, the more data that is processed and, typically, the higher the picture resolution.

Black Level
Light level of the darker portions of a video image.  A black level control sets the light level of the darkest portion of the video signal to match that of the display's black level capability.  Black is, of course, the absence of light.  Many displays have as much difficulty shutting off the light in the black portions of an image as they do creating light in the brighter portions.  CRT-based displays usually have better black levels than DLP, plasma, and LCD, which rank, generally, in that order.

Boost
To increase, make louder or brighter; opposite of attenuate.

Brightness
For video, the overall light level of the entire image.  A brightness control makes an image brighter; however, when it is combined with a contrast, or white level control, the brightness control is best used to define the black level of the image (see Black Level).  For audio, something referred to as bright has too much treble or high frequency sound.