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footroom

名詞

footroom (uncountable)

1. Space for a person's feet, especially while seated.
   Coordinate terms: headroom, legroom
   • 2012, Phil Edmonston, Lemon-Aid New Cars and Trucks 2013
     Drivers say there's insufficient footroom; the brake and accelerator pedals are mounted too close to each other; narrow, poorly cushioned seats lack sufficient thigh support; […]
2. (signal processing) Extra bandwidth for lower-than-expected values.
   Coordinate term: headroom
   • 2000, Wolfgang Ahnert, Frank Steffen, Sound Reinforcement Engineering: Fundamentals and Practice (page 177)
     […] the difference between signal-to-noise ratio and overload reserve (headroom) as well as noise (safety) margin (footroom).
   • 2012, Charles Poynton, Digital Video and HD: Algorithms and Interfaces (page 45)
     To accommodate footroom, the number representation must allow negative numbers.
   • 2017, Steve Wright, Digital Compositing for Film and Video
     Footroom – the range of code values in the blacks of an image that encompass the variations in grain or noise.

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