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1. (video) The measure of pixels horizontally and vertically. For example, 1920x1080 is considered HD, or high-definition. 2. (audio) The combined bit depthDefinition:
The number of levels (bits) a signal (audio or video) is digitized into, more bits means a more accurate sound/picture. and sample rateDefinition:
The number of times per second that an analog signal is sampled prior to conversion into digital via an analog-to-digital converter. See Nyquist Frequency. See Analog to Digital Converter. of a digitalDefinition:
A signal or data expressed as series of the digits 0 and 1, typically represented by values of a physical quantity such as voltage or magnetic polarization. audio signal.