Dolby Digital (Dolby AC-3) - The 5.1 channel audio standard for DTV and HDTV in Canada and the USA. It includes six discreet audio channels - Left, Center, Right, Left Surround (or side), Right Surround (or side), and a subwoofer -- LFE, "low frequency effects" -- (considered the ".1" as it is limited in bandwidth). Many televisions process these six channels into a two channel stereo pair and do not provide the full 5.1 channel surround sound.
Metadata - Informational data about the data, included in a signal's data stream.
Luminance - Component of the video signal that represents the brightness of the image.
Analog TV - Analog technology has been in use for the past 50 years to transmit conventional TV signals to consumers. "Standard" television broadcasts in analog TV. Analog signals vary continuously, creating fluctuations in color and brightness.
Fire-wire - (see IEEE 1394)
5.1 channel - This is 6 channel audio. The 6th channel (the sub-woofer) has reduced bandwidth.
SMPTE - "Society of Motion Picture and Television Engineers." A professional organization that is responsible for the standards for film and television production.
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