a) A circuit’s signal range. b) An audio term which refers to the range between the softest and loudest levels a source can produce without distortion. c) The difference, in decibels, between the overload level and the minimum acceptable signal level in a system or transducer. d) The ratio of two instantaneous signal magnitudes, one being the maximum value consistent with specified criteria or performance, the other the maximum value of noise. e) The concept of dynamic range is applicable to many measurements beyond characterization of the video signal, and the ratios may also be expressed as f-stops, density differences, illumination, or luminance ratios, etc.