dynamic range

noun
Audio. the ratio of the loudest to faintest sounds reproduced without significant distortion, usually expressed in decibels.

Origin:
1930–35

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World English Dictionary
dynamic range
 
n
the range of signal amplitudes over which an electronic communications channel can operate within acceptable limits of distortion. The range is determined by system noise at the lower end and by the onset of overload at the upper end

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Dictionary.com's 21st Century Lexicon
Main Entry:  dynamic range1
Part of Speech:  n
Definition:  the ratio of a specified maximum possible level of a parameter to the minimum detectable or acceptable value of that parameter, such as the range of an audio signal from its lowest to its highest level
Main Entry:  dynamic range2
Part of Speech:  n
Definition:  in a digital system or device, the ratio of maximum and minimum signal levels required to maintain a bit error ratio (number of erroneous bits divided by total bits processed)
Main Entry:  dynamic range3
Part of Speech:  n
Definition:  in a digital image, the number of possible colors or shades of gray that can be included in a particular image
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Example sentences
On the receiving end, the human ear-a non-linear device with enormous dynamic
  range-adds to the complication.
Linearity, even when plotted on log paper, is an approximation that is only
  valid over a limited dynamic range.
The piano's dynamic range allowed for a subtlety in composition previously
  unimagined.
All dynamic range still there, maintained and preserved.
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