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| 4:3 - The aspect ratio (screen size) of a standard television set, meaning four horizontal units to three vertical units. Sometimes referred to as 'full screen'. | |
| 16:9 - The aspect ratio (screen size) of a Widescreen television, meaning sixteen horizontal units to nine vertical units. | |
| 5.1 - The number of separate, or discrete, audio channels in digital surround sound representing five main channels for front left and right, front centre and rear left and right, plus a limited bandwidth sub-woofer channel. | |
| 6.1 - The term sometimes used to (incorrectly) describe the new digital sound formats Dolby Digital Surround-EX and DTS-ES. These systems create a rear-centre channel from the left and right rear surround channels. |