Linearity
Linearity In any home entertainment system, at each stage the input and output signals should be precisely proportional to each other (except where specifically provided such as RIAA equalization or Dolby noise reduction). Thus if a momentary 0.5 volts is fed to the input of an amplifier and it produced a three volt output at its speaker terminals, then a momentary 1.0 volt input should produce a six volt output. Any other output means that there is a non-linearity which will manifest itself as harmonic distortion. Another example relates to digital to analogue converters. Each particular quantization level in a PCM digital signal has a precise analogue voltage level associated with it. Any variation means distortion.
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